zcatgui/src/widgets/advanced_table/advanced_table.zig

//! AdvancedTable Widget - Schema-driven data table
//!
//! A full-featured table widget with:
//! - Schema-driven configuration (TableSchema + ColumnDef)
//! - Excel-style cell editing with overlay
//! - Auto-CRUD (automatic CREATE/UPDATE/DELETE detection)
//! - Keyboard navigation (arrows, Tab, Enter, Escape)
//! - Column sorting (click header)
//! - Row operations (Ctrl+N/A/B, Ctrl+arrows)
//! - Visual state indicators (normal, modified, new, deleted, error)
//! - Lookup & auto-fill for related data
//!
//! This module re-exports types from the advanced_table/ subdirectory.

const std = @import("std");
const Context = @import("../../core/context.zig").Context;
const Command = @import("../../core/command.zig");
const Layout = @import("../../core/layout.zig");
const Style = @import("../../core/style.zig");

// Re-export types
pub const types = @import("types.zig");
pub const CellValue = types.CellValue;
pub const ColumnType = types.ColumnType;
pub const RowState = types.RowState;
pub const RowLockState = types.RowLockState;
pub const SortDirection = types.SortDirection;
pub const CRUDAction = types.CRUDAction;
pub const ValidationResult = types.ValidationResult;
pub const TableColors = types.TableColors;
pub const BasicColors = types.BasicColors;
pub const TableConfig = types.TableConfig;
pub const Row = types.Row;

// Re-export schema
pub const schema = @import("schema.zig");
pub const ColumnDef = schema.ColumnDef;
pub const ColumnAlign = schema.ColumnAlign;
pub const AutoFillMapping = schema.AutoFillMapping;
pub const SelectOption = schema.SelectOption;
pub const TableSchema = schema.TableSchema;
pub const DataStore = schema.DataStore;

// Re-export state
pub const state = @import("state.zig");
pub const AdvancedTableState = state.AdvancedTableState;
pub const AdvancedTableResult = state.AdvancedTableResult;

// =============================================================================
// Public API
// =============================================================================

/// Draw an AdvancedTable with default layout
pub fn advancedTable(
    ctx: *Context,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
) AdvancedTableResult {
    return advancedTableEx(ctx, table_state, table_schema, null);
}

/// Draw an AdvancedTable with custom colors
pub fn advancedTableEx(
    ctx: *Context,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    colors: ?*const TableColors,
) AdvancedTableResult {
    const bounds = ctx.layout.nextRect();
    return advancedTableRect(ctx, bounds, table_state, table_schema, colors);
}

/// Draw an AdvancedTable in a specific rectangle
pub fn advancedTableRect(
    ctx: *Context,
    bounds: Layout.Rect,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    custom_colors: ?*const TableColors,
) AdvancedTableResult {
    var result = AdvancedTableResult{};

    if (bounds.isEmpty() or table_schema.columns.len == 0) return result;

    // Get colors
    const default_colors = TableColors{};
    const colors = custom_colors orelse table_schema.colors orelse &default_colors;
    const config = table_schema.config;

    // Ensure valid selection if table has data (like Table widget does)
    if (table_state.getRowCount() > 0 and table_schema.columns.len > 0) {
        if (table_state.selected_row < 0) table_state.selected_row = 0;
        if (table_state.selected_col < 0) table_state.selected_col = 0;
    }

    // Generate unique ID for focus system
    const widget_id: u64 = @intFromPtr(table_state);

    // Register as focusable
    ctx.registerFocusable(widget_id);

    // Check mouse interaction
    const mouse = ctx.input.mousePos();
    const hovered = bounds.contains(mouse.x, mouse.y);
    const clicked = hovered and ctx.input.mousePressed(.left);

    if (clicked) {
        ctx.requestFocus(widget_id);
        result.clicked = true;
    }

    // Check if we have focus
    const has_focus = ctx.hasFocus(widget_id);
    table_state.focused = has_focus;

    // Calculate dimensions
    const state_col_w: u32 = if (config.show_row_state_indicators) config.state_indicator_width else 0;
    const header_h: u32 = if (config.show_headers) config.header_height else 0;
    const content_h = bounds.h -| header_h;
    const visible_rows: usize = @intCast(content_h / config.row_height);

    // Begin clipping
    ctx.pushCommand(Command.clip(bounds.x, bounds.y, bounds.w, bounds.h));

    // Draw header
    if (config.show_headers) {
        drawHeader(ctx, bounds, table_state, table_schema, state_col_w, colors, &result);
    }

    // Calculate visible row range
    const first_visible = table_state.scroll_row;
    const last_visible = @min(first_visible + visible_rows, table_state.getRowCount());

    // Draw visible rows
    for (first_visible..last_visible) |row_idx| {
        const row_y = bounds.y + @as(i32, @intCast(header_h)) +
            @as(i32, @intCast((row_idx - first_visible) * config.row_height));

        const row_bounds = Layout.Rect.init(
            bounds.x,
            row_y,
            bounds.w,
            config.row_height,
        );

        drawRow(ctx, row_bounds, table_state, table_schema, row_idx, state_col_w, colors, has_focus, &result);
    }

    // End clipping
    ctx.pushCommand(Command.clipEnd());

    // Draw focus ring (outside clip)
    if (has_focus) {
        if (Style.isFancy()) {
            ctx.pushCommand(Command.focusRing(bounds.x, bounds.y, bounds.w, bounds.h, 4));
        } else {
            ctx.pushCommand(Command.rectOutline(
                bounds.x - 1,
                bounds.y - 1,
                bounds.w + 2,
                bounds.h + 2,
                colors.focus_ring,
            ));
        }
    }

    // Draw scrollbar if needed
    if (table_state.getRowCount() > visible_rows) {
        drawScrollbar(ctx, bounds, table_state, visible_rows, config, colors);
    }

    // Handle keyboard
    if (has_focus) {
        if (table_state.editing) {
            // Handle editing keyboard
            handleEditingKeyboard(ctx, table_state, table_schema, &result);

            // Draw editing overlay
            drawEditingOverlay(ctx, bounds, table_state, table_schema, header_h, state_col_w, colors);
        } else if (config.keyboard_nav) {
            // Handle navigation keyboard
            handleKeyboard(ctx, table_state, table_schema, visible_rows, &result);
        }
    }

    // Ensure selection is visible
    ensureSelectionVisible(table_state, visible_rows);

    // Auto-CRUD detection (when row changes)
    if (config.auto_crud_enabled and result.selection_changed and table_state.rowChanged()) {
        result.crud_action = detectCRUDAction(table_state, table_schema);

        // Capture snapshot of new row
        if (table_state.selected_row >= 0) {
            table_state.captureSnapshot(@intCast(table_state.selected_row)) catch {};
        }
    }

    // Phase 8: Invoke callbacks
    invokeCallbacks(ctx, table_state, table_schema, &result);

    return result;
}

// =============================================================================
// Callback System (Phase 8)
// =============================================================================

fn invokeCallbacks(
    ctx: *Context,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    result: *AdvancedTableResult,
) void {
    const config = table_schema.config;
    const current_time = ctx.current_time_ms;

    // Check debounce
    const time_since_last = current_time -| table_state.last_callback_time_ms;
    const debounce_ok = time_since_last >= config.callback_debounce_ms;

    // on_row_selected: called when selection changes (with debounce)
    if (result.selection_changed and debounce_ok) {
        if (table_schema.on_row_selected) |callback| {
            if (table_state.selected_row >= 0) {
                const row_idx: usize = @intCast(table_state.selected_row);
                if (table_state.getRowConst(row_idx)) |row| {
                    callback(row_idx, row);
                    table_state.last_callback_time_ms = current_time;
                }
            }
        }
    }

    // on_active_row_changed: called when moving to a different row (for loading detail panels)
    // Only fires once per row change, not on every frame
    if (table_state.selected_row != table_state.last_notified_row) {
        if (table_schema.on_active_row_changed) |callback| {
            if (table_state.selected_row >= 0) {
                const new_row_idx: usize = @intCast(table_state.selected_row);
                if (table_state.getRowConst(new_row_idx)) |row| {
                    const old_row: ?usize = if (table_state.last_notified_row >= 0)
                        @intCast(table_state.last_notified_row)
                    else
                        null;
                    callback(old_row, new_row_idx, row);
                }
            }
        }
        table_state.last_notified_row = table_state.selected_row;
    }
}

// =============================================================================
// Internal Rendering
// =============================================================================

fn drawHeader(
    ctx: *Context,
    bounds: Layout.Rect,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    state_col_w: u32,
    colors: *const TableColors,
    result: *AdvancedTableResult,
) void {
    const config = table_schema.config;
    const header_y = bounds.y;
    var col_x = bounds.x;

    // State indicator column header
    if (state_col_w > 0) {
        ctx.pushCommand(Command.rect(col_x, header_y, state_col_w, config.header_height, colors.header_bg));
        col_x += @as(i32, @intCast(state_col_w));
    }

    // Column headers
    const mouse = ctx.input.mousePos();

    for (table_schema.columns, 0..) |col, idx| {
        if (!col.visible) continue;

        const col_rect = Layout.Rect.init(col_x, header_y, col.width, config.header_height);
        const col_hovered = col_rect.contains(mouse.x, mouse.y);
        const col_clicked = col_hovered and ctx.input.mousePressed(.left);

        // Determine background color
        var bg_color = colors.header_bg;
        if (table_state.sort_column == @as(i32, @intCast(idx))) {
            bg_color = colors.header_sorted;
        } else if (col_hovered) {
            bg_color = colors.header_hover;
        }

        // Draw header cell
        if (Style.isFancy()) {
            ctx.pushCommand(Command.roundedRect(col_rect.x, col_rect.y, col_rect.w, col_rect.h, bg_color, 0));
        } else {
            ctx.pushCommand(Command.rect(col_rect.x, col_rect.y, col_rect.w, col_rect.h, bg_color));
        }

        // Draw header text
        const text_y = header_y + @as(i32, @intCast((config.header_height - 8) / 2));
        ctx.pushCommand(Command.text(col_x + 4, text_y, col.title, colors.header_fg));

        // Draw lookup indicator (Phase 7c) - small "?" icon
        if (col.hasLookup()) {
            const lookup_x = col_x + @as(i32, @intCast(col.width)) - 24;
            ctx.pushCommand(Command.text(lookup_x, text_y, "?", Style.Color.primary));
        }

        // Draw sort indicator
        if (table_state.sort_column == @as(i32, @intCast(idx))) {
            const indicator_x = col_x + @as(i32, @intCast(col.width)) - 12;
            const indicator = switch (table_state.sort_direction) {
                .ascending => "^",
                .descending => "v",
                .none => "",
            };
            if (indicator.len > 0) {
                ctx.pushCommand(Command.text(indicator_x, text_y, indicator, colors.sort_indicator));
            }
        }

        // Handle click for sorting
        if (col_clicked and col.sortable and config.allow_sorting) {
            _ = table_state.toggleSort(idx);
            result.sort_changed = true;
            result.sort_column = idx;
            result.sort_direction = table_state.sort_direction;

            // Actually sort the rows
            sortRows(table_state, table_schema.columns[idx].name, table_state.sort_direction);
        }

        // Draw separator
        ctx.pushCommand(Command.rect(
            col_x + @as(i32, @intCast(col.width)) - 1,
            header_y,
            1,
            config.header_height,
            colors.border,
        ));

        col_x += @as(i32, @intCast(col.width));
    }
}

fn drawRow(
    ctx: *Context,
    bounds: Layout.Rect,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    row_idx: usize,
    state_col_w: u32,
    colors: *const TableColors,
    has_focus: bool,
    result: *AdvancedTableResult,
) void {
    const config = table_schema.config;
    const is_selected_row = table_state.selected_row == @as(i32, @intCast(row_idx));
    const row_state = table_state.getRowState(row_idx);

    // Determine row background color
    var row_bg = if (config.alternating_rows and row_idx % 2 == 1)
        colors.row_alternate
    else
        colors.row_normal;

    // Apply state color overlay
    row_bg = switch (row_state) {
        .modified => blendColor(row_bg, colors.state_modified, 0.2),
        .new => blendColor(row_bg, colors.state_new, 0.2),
        .deleted => blendColor(row_bg, colors.state_deleted, 0.3),
        .@"error" => blendColor(row_bg, colors.state_error, 0.3),
        .normal => row_bg,
    };

    // Selection overlay - SOLO la fila seleccionada cambia de color
    // El color depende de si la tabla tiene focus
    if (is_selected_row) {
        row_bg = if (has_focus) colors.selected_row else colors.selected_row_unfocus;
    }
    // Las filas NO seleccionadas mantienen row_bg (row_normal o row_alternate)

    // Draw row background
    ctx.pushCommand(Command.rect(bounds.x, bounds.y, bounds.w, config.row_height, row_bg));

    var col_x = bounds.x;
    const mouse = ctx.input.mousePos();

    // State indicator column
    if (state_col_w > 0) {
        drawStateIndicator(ctx, col_x, bounds.y, state_col_w, config.row_height, row_state, colors);
        col_x += @as(i32, @intCast(state_col_w));
    }

    // Data cells
    for (table_schema.columns, 0..) |col, col_idx| {
        if (!col.visible) continue;

        const cell_rect = Layout.Rect.init(col_x, bounds.y, col.width, config.row_height);
        const is_selected_cell = is_selected_row and table_state.selected_col == @as(i32, @intCast(col_idx));
        const cell_clicked = cell_rect.contains(mouse.x, mouse.y) and ctx.input.mousePressed(.left);

        // Cell indicator for selected cell - más visible que antes
        if (is_selected_cell and has_focus) {
            // Fondo con tinte más visible (0.35 en lugar de 0.15)
            ctx.pushCommand(Command.rect(col_x, bounds.y, col.width, config.row_height, blendColor(row_bg, colors.selected_cell, 0.35)));
            // Borde doble para mayor visibilidad
            ctx.pushCommand(Command.rectOutline(col_x, bounds.y, col.width, config.row_height, colors.selected_cell));
            ctx.pushCommand(Command.rectOutline(col_x + 1, bounds.y + 1, col.width -| 2, config.row_height -| 2, colors.selected_cell));
        } else if (is_selected_cell) {
            // Sin focus: indicación más sutil
            ctx.pushCommand(Command.rect(col_x, bounds.y, col.width, config.row_height, blendColor(row_bg, colors.selected_cell, 0.15)));
            ctx.pushCommand(Command.rectOutline(col_x, bounds.y, col.width, config.row_height, colors.border));
        }

        // Get cell value
        if (table_state.getRow(row_idx)) |row| {
            const value = row.get(col.name);
            var format_buf: [128]u8 = undefined;
            const formatted = value.format(&format_buf);

            // Copy text to frame arena to ensure it persists until rendering
            // (format_buf is stack-allocated and goes out of scope)
            const text = ctx.frameAllocator().dupe(u8, formatted) catch formatted;

            // Draw cell text
            const text_y = bounds.y + @as(i32, @intCast((config.row_height - 8) / 2));
            const text_color = if (is_selected_cell) colors.text_selected else colors.text_normal;
            ctx.pushCommand(Command.text(col_x + 4, text_y, text, text_color));
        }

        // Handle cell click and double-click
        if (cell_clicked) {
            const current_time = ctx.current_time_ms;
            const same_cell = table_state.last_click_row == @as(i32, @intCast(row_idx)) and
                table_state.last_click_col == @as(i32, @intCast(col_idx));
            const time_diff = current_time -| table_state.last_click_time;
            const is_double_click = same_cell and time_diff < table_state.double_click_threshold_ms;

            if (is_double_click and config.allow_edit and col.editable and !table_state.editing) {
                // Double-click: start editing
                if (table_state.getRow(row_idx)) |row| {
                    const value = row.get(col.name);
                    var format_buf: [128]u8 = undefined;
                    const edit_text = value.format(&format_buf);
                    table_state.startEditing(edit_text);
                    table_state.original_value = value;
                    result.edit_started = true;
                }
                // Reset click tracking
                table_state.last_click_time = 0;
                table_state.last_click_row = -1;
                table_state.last_click_col = -1;
            } else {
                // Single click: select cell
                if (!is_selected_cell) {
                    table_state.selectCell(row_idx, col_idx);
                    result.selection_changed = true;
                    result.selected_row = row_idx;
                    result.selected_col = col_idx;
                }
                // Update click tracking for potential double-click
                table_state.last_click_time = current_time;
                table_state.last_click_row = @intCast(row_idx);
                table_state.last_click_col = @intCast(col_idx);
            }
        }

        col_x += @as(i32, @intCast(col.width));
    }

    // Bottom border
    ctx.pushCommand(Command.rect(
        bounds.x,
        bounds.y + @as(i32, @intCast(config.row_height)) - 1,
        bounds.w,
        1,
        colors.border,
    ));
}

fn drawStateIndicator(
    ctx: *Context,
    x: i32,
    y: i32,
    w: u32,
    h: u32,
    row_state: RowState,
    colors: *const TableColors,
) void {
    const indicator_size: u32 = 8;
    const indicator_x = x + @as(i32, @intCast((w - indicator_size) / 2));
    const indicator_y = y + @as(i32, @intCast((h - indicator_size) / 2));

    const color = switch (row_state) {
        .modified => colors.indicator_modified,
        .new => colors.indicator_new,
        .deleted => colors.indicator_deleted,
        .@"error" => colors.state_error,
        .normal => return, // No indicator
    };

    // Draw circle indicator
    ctx.pushCommand(Command.rect(indicator_x, indicator_y, indicator_size, indicator_size, color));
}

fn drawScrollbar(
    ctx: *Context,
    bounds: Layout.Rect,
    table_state: *AdvancedTableState,
    visible_rows: usize,
    config: TableConfig,
    colors: *const TableColors,
) void {
    const total_rows = table_state.getRowCount();
    if (total_rows == 0) return;

    const scrollbar_w: u32 = 12;
    const header_h: u32 = if (config.show_headers) config.header_height else 0;
    const scrollbar_h = bounds.h -| header_h;

    const scrollbar_x = bounds.x + @as(i32, @intCast(bounds.w -| scrollbar_w));
    const scrollbar_y = bounds.y + @as(i32, @intCast(header_h));

    // Background
    ctx.pushCommand(Command.rect(scrollbar_x, scrollbar_y, scrollbar_w, scrollbar_h, colors.border));

    // Thumb
    const thumb_ratio = @as(f32, @floatFromInt(visible_rows)) / @as(f32, @floatFromInt(total_rows));
    const thumb_h = @max(20, @as(u32, @intFromFloat(@as(f32, @floatFromInt(scrollbar_h)) * thumb_ratio)));

    const scroll_ratio = @as(f32, @floatFromInt(table_state.scroll_row)) /
        @as(f32, @floatFromInt(@max(1, total_rows - visible_rows)));
    const thumb_y_offset = @as(u32, @intFromFloat(scroll_ratio * @as(f32, @floatFromInt(scrollbar_h - thumb_h))));

    ctx.pushCommand(Command.rect(
        scrollbar_x + 2,
        scrollbar_y + @as(i32, @intCast(thumb_y_offset)),
        scrollbar_w - 4,
        thumb_h,
        colors.header_bg,
    ));
}

fn drawEditingOverlay(
    ctx: *Context,
    bounds: Layout.Rect,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    header_h: u32,
    state_col_w: u32,
    colors: *const TableColors,
) void {
    if (table_state.selected_row < 0 or table_state.selected_col < 0) return;

    const row_idx: usize = @intCast(table_state.selected_row);
    const col_idx: usize = @intCast(table_state.selected_col);
    const config = table_schema.config;

    // Check if row is visible
    if (row_idx < table_state.scroll_row) return;
    const visible_row = row_idx - table_state.scroll_row;
    const visible_rows = (bounds.h -| header_h) / config.row_height;
    if (visible_row >= visible_rows) return;

    // Calculate cell position
    var col_x = bounds.x + @as(i32, @intCast(state_col_w));
    for (table_schema.columns[0..col_idx]) |col| {
        if (col.visible) {
            col_x += @as(i32, @intCast(col.width));
        }
    }

    const col_def = table_schema.columns[col_idx];
    const cell_y = bounds.y + @as(i32, @intCast(header_h + visible_row * config.row_height));
    const cell_h = config.row_height;

    // Draw editing overlay background
    ctx.pushCommand(Command.rect(col_x, cell_y, col_def.width, cell_h, colors.cell_editing_bg));

    // Draw border
    ctx.pushCommand(Command.rectOutline(col_x, cell_y, col_def.width, cell_h, colors.cell_editing_border));

    // Draw edit text
    const edit_text = table_state.getEditText();
    const text_y = cell_y + @as(i32, @intCast((cell_h - 8) / 2));
    ctx.pushCommand(Command.text(col_x + 4, text_y, edit_text, colors.text_selected));

    // Draw cursor
    const cursor_x = col_x + 4 + @as(i32, @intCast(table_state.edit_cursor * 8));
    ctx.pushCommand(Command.rect(cursor_x, text_y, 1, 8, colors.text_selected));
}

// =============================================================================
// Keyboard Handling
// =============================================================================

fn handleKeyboard(
    ctx: *Context,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    visible_rows: usize,
    result: *AdvancedTableResult,
) void {
    const row_count = table_state.getRowCount();
    if (row_count == 0) return;

    const config = table_schema.config;
    const col_count = table_schema.columns.len;

    // Use navKeyPressed for navigation (includes key repeats)
    if (ctx.input.navKeyPressed()) |nav_key| {
        switch (nav_key) {
            .up => {
                if (table_state.selected_row > 0) {
                    const new_row: usize = @intCast(table_state.selected_row - 1);
                    const new_col: usize = @intCast(@max(0, table_state.selected_col));
                    table_state.selectCell(new_row, new_col);
                    result.selection_changed = true;
                    result.selected_row = new_row;
                    result.selected_col = new_col;
                }
            },
            .down => {
                if (table_state.selected_row < @as(i32, @intCast(row_count)) - 1) {
                    const new_row: usize = @intCast(table_state.selected_row + 1);
                    const new_col: usize = @intCast(@max(0, table_state.selected_col));
                    table_state.selectCell(new_row, new_col);
                    result.selection_changed = true;
                    result.selected_row = new_row;
                    result.selected_col = new_col;
                }
            },
            .left => {
                if (table_state.selected_col > 0) {
                    const new_row: usize = @intCast(@max(0, table_state.selected_row));
                    const new_col: usize = @intCast(table_state.selected_col - 1);
                    table_state.selectCell(new_row, new_col);
                    result.selection_changed = true;
                    result.selected_row = new_row;
                    result.selected_col = new_col;
                }
            },
            .right => {
                if (table_state.selected_col < @as(i32, @intCast(col_count)) - 1) {
                    const new_row: usize = @intCast(@max(0, table_state.selected_row));
                    const new_col: usize = @intCast(table_state.selected_col + 1);
                    table_state.selectCell(new_row, new_col);
                    result.selection_changed = true;
                    result.selected_row = new_row;
                    result.selected_col = new_col;
                }
            },
            .page_up => {
                const new_row: usize = @intCast(@max(0, table_state.selected_row - @as(i32, @intCast(visible_rows))));
                const new_col: usize = @intCast(@max(0, table_state.selected_col));
                table_state.selectCell(new_row, new_col);
                result.selection_changed = true;
                result.selected_row = new_row;
                result.selected_col = new_col;
            },
            .page_down => {
                const new_row: usize = @intCast(@min(
                    @as(i32, @intCast(row_count)) - 1,
                    table_state.selected_row + @as(i32, @intCast(visible_rows)),
                ));
                const new_col: usize = @intCast(@max(0, table_state.selected_col));
                table_state.selectCell(new_row, new_col);
                result.selection_changed = true;
                result.selected_row = new_row;
                result.selected_col = new_col;
            },
            .home => {
                var new_row: usize = undefined;
                var new_col: usize = undefined;
                if (ctx.input.modifiers.ctrl) {
                    // Ctrl+Home: first cell
                    new_row = 0;
                    new_col = 0;
                } else {
                    // Home: first column
                    new_row = @intCast(@max(0, table_state.selected_row));
                    new_col = 0;
                }
                table_state.selectCell(new_row, new_col);
                result.selection_changed = true;
                result.selected_row = new_row;
                result.selected_col = new_col;
            },
            .end => {
                var new_row: usize = undefined;
                var new_col: usize = undefined;
                if (ctx.input.modifiers.ctrl) {
                    // Ctrl+End: last cell
                    new_row = if (row_count > 0) row_count - 1 else 0;
                    new_col = col_count - 1;
                } else {
                    // End: last column
                    new_row = @intCast(@max(0, table_state.selected_row));
                    new_col = col_count - 1;
                }
                table_state.selectCell(new_row, new_col);
                result.selection_changed = true;
                result.selected_row = new_row;
                result.selected_col = new_col;
            },
            .tab => {
                if (config.handle_tab) {
                    // Tab navigation handled below
                }
            },
            .enter => {
                // Enter to start editing handled below
            },
            .escape => {},
            else => {},
        }
    }

    // Tab navigation (if handle_tab is enabled)
    if (config.handle_tab and ctx.input.keyPressed(.tab)) {
        const shift = ctx.input.modifiers.shift;

        if (shift) {
            // Shift+Tab: move left, wrap to previous row
            if (table_state.selected_col > 0) {
                table_state.selectCell(
                    @intCast(@max(0, table_state.selected_row)),
                    @intCast(table_state.selected_col - 1),
                );
                result.selection_changed = true;
            } else if (table_state.selected_row > 0 and config.wrap_navigation) {
                // Wrap to end of previous row
                table_state.selectCell(
                    @intCast(table_state.selected_row - 1),
                    col_count - 1,
                );
                result.selection_changed = true;
            }
        } else {
            // Tab: move right, wrap to next row
            if (table_state.selected_col < @as(i32, @intCast(col_count)) - 1) {
                table_state.selectCell(
                    @intCast(@max(0, table_state.selected_row)),
                    @intCast(table_state.selected_col + 1),
                );
                result.selection_changed = true;
            } else if (table_state.selected_row < @as(i32, @intCast(row_count)) - 1 and config.wrap_navigation) {
                // Wrap to beginning of next row
                table_state.selectCell(
                    @intCast(table_state.selected_row + 1),
                    0,
                );
                result.selection_changed = true;
            }
        }
    }

    // Start editing with F2, Enter, or Space (empty)
    if (config.allow_edit) {
        const start_edit_key = ctx.input.keyPressed(.f2) or ctx.input.keyPressed(.enter);
        const start_empty = ctx.input.keyPressed(.space);

        if (start_edit_key or start_empty) {
            if (table_state.selected_row >= 0 and table_state.selected_col >= 0) {
                const col_idx: usize = @intCast(table_state.selected_col);
                if (col_idx < table_schema.columns.len and table_schema.columns[col_idx].editable) {
                    if (table_state.getRow(@intCast(table_state.selected_row))) |row| {
                        const value = row.get(table_schema.columns[col_idx].name);
                        if (start_empty) {
                            // Espacio: empezar vacío
                            table_state.startEditing("");
                        } else {
                            // F2/Enter: empezar con valor actual
                            var format_buf: [128]u8 = undefined;
                            const text = value.format(&format_buf);
                            table_state.startEditing(text);
                        }
                        table_state.original_value = value;
                        result.edit_started = true;
                    }
                }
            }
        }
    }

    // Row operations (if allowed)
    if (config.allow_row_operations) {
        // Ctrl+N: Insert row at current position
        if (ctx.input.keyPressed(.n) and ctx.input.modifiers.ctrl) {
            const insert_idx: usize = if (table_state.selected_row >= 0)
                @intCast(table_state.selected_row)
            else
                0;
            if (table_state.insertRow(insert_idx)) |new_idx| {
                table_state.selectCell(new_idx, 0);
                result.row_inserted = true;
                result.selection_changed = true;
            } else |_| {}
        }

        // Ctrl+Delete: Delete current row
        if (ctx.input.keyPressed(.delete) and ctx.input.modifiers.ctrl) {
            if (table_state.selected_row >= 0) {
                const delete_idx: usize = @intCast(table_state.selected_row);
                table_state.deleteRow(delete_idx);
                result.row_deleted = true;

                // Adjust selection
                const remaining_rows = table_state.getRowCount();
                if (remaining_rows == 0) {
                    table_state.selected_row = -1;
                } else if (delete_idx >= remaining_rows) {
                    table_state.selected_row = @intCast(remaining_rows - 1);
                }
                result.selection_changed = true;
            }
        }
    }

    // Ctrl+A: Select all rows (if multi-select enabled)
    if (config.allow_multi_select and ctx.input.keyPressed(.a) and ctx.input.modifiers.ctrl) {
        table_state.selectAllRows();
        result.selection_changed = true;
    }

    // Type-to-edit or incremental search
    // Behavior: If current cell is editable → start editing with typed char
    //           If not editable → incremental search in first column
    if (!ctx.input.modifiers.ctrl and !ctx.input.modifiers.alt) {
        if (ctx.input.text_input_len > 0) {
            const text = ctx.input.text_input[0..ctx.input.text_input_len];

            // Check if current cell is editable
            const current_cell_editable = blk: {
                if (!config.allow_edit) break :blk false;
                if (table_state.selected_row < 0 or table_state.selected_col < 0) break :blk false;
                const col_idx: usize = @intCast(table_state.selected_col);
                if (col_idx >= table_schema.columns.len) break :blk false;
                break :blk table_schema.columns[col_idx].editable;
            };

            if (current_cell_editable) {
                // Start editing with first typed character
                if (text.len > 0 and text[0] >= 32 and text[0] < 127) {
                    if (table_state.getRow(@intCast(table_state.selected_row))) |row| {
                        const col_idx: usize = @intCast(table_state.selected_col);
                        const value = row.get(table_schema.columns[col_idx].name);
                        // Start with the typed text (replaces content)
                        table_state.startEditing(text);
                        table_state.original_value = value;
                        result.edit_started = true;
                    }
                }
            } else {
                // Incremental search (type-to-search) in first column
                for (text) |char| {
                    if (char >= 32 and char < 127) {
                        const search_term = table_state.addSearchChar(char, ctx.current_time_ms);

                        if (search_term.len > 0 and table_schema.columns.len > 0) {
                            const first_col_name = table_schema.columns[0].name;
                            const start_row: usize = if (table_state.selected_row >= 0)
                                @intCast(table_state.selected_row)
                            else
                                0;

                            var found_row: ?usize = null;

                            // Search from current position to end
                            for (start_row..row_count) |row| {
                                if (table_state.getRowConst(row)) |row_data| {
                                    const cell_value = row_data.get(first_col_name);
                                    var format_buf: [128]u8 = undefined;
                                    const cell_text = cell_value.format(&format_buf);
                                    if (startsWithIgnoreCase(cell_text, search_term)) {
                                        found_row = row;
                                        break;
                                    }
                                }
                            }

                            // Wrap to beginning if not found
                            if (found_row == null and start_row > 0) {
                                for (0..start_row) |row| {
                                    if (table_state.getRowConst(row)) |row_data| {
                                        const cell_value = row_data.get(first_col_name);
                                        var format_buf: [128]u8 = undefined;
                                        const cell_text = cell_value.format(&format_buf);
                                        if (startsWithIgnoreCase(cell_text, search_term)) {
                                            found_row = row;
                                            break;
                                        }
                                    }
                                }
                            }

                            // Move selection if found
                            if (found_row) |row_idx| {
                                table_state.selectCell(row_idx, @intCast(@max(0, table_state.selected_col)));
                                result.selection_changed = true;
                            }
                        }
                    }
                }
            }
        }
    }
}

fn handleEditingKeyboard(
    ctx: *Context,
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    result: *AdvancedTableResult,
) void {
    const config = table_schema.config;

    // Escape: cancel editing (1st = revert, 2nd = exit without save)
    if (ctx.input.keyPressed(.escape)) {
        table_state.escape_count += 1;
        if (table_state.escape_count >= 2 or table_state.original_value == null) {
            // Exit without saving
            table_state.stopEditing();
            result.edit_ended = true;
        } else {
            // Revert to original value
            if (table_state.original_value) |orig| {
                var format_buf: [128]u8 = undefined;
                const text = orig.format(&format_buf);
                table_state.startEditing(text);
            }
        }
        return;
    }

    // Reset escape count on any other key
    table_state.escape_count = 0;

    // Enter: confirm editing
    if (ctx.input.keyPressed(.enter)) {
        commitEdit(table_state, table_schema, result);
        table_state.stopEditing();
        result.edit_ended = true;
        return;
    }

    // Tab: confirm and move to next cell
    if (ctx.input.keyPressed(.tab) and config.handle_tab) {
        commitEdit(table_state, table_schema, result);
        table_state.stopEditing();
        result.edit_ended = true;

        // Move to next/prev cell
        const shift = ctx.input.modifiers.shift;
        const col_count = table_schema.columns.len;
        const row_count = table_state.getRowCount();

        if (shift) {
            // Shift+Tab: move left
            if (table_state.selected_col > 0) {
                table_state.selectCell(
                    @intCast(@max(0, table_state.selected_row)),
                    @intCast(table_state.selected_col - 1),
                );
            } else if (table_state.selected_row > 0 and config.wrap_navigation) {
                table_state.selectCell(
                    @intCast(table_state.selected_row - 1),
                    col_count - 1,
                );
            }
        } else {
            // Tab: move right
            if (table_state.selected_col < @as(i32, @intCast(col_count)) - 1) {
                table_state.selectCell(
                    @intCast(@max(0, table_state.selected_row)),
                    @intCast(table_state.selected_col + 1),
                );
            } else if (table_state.selected_row < @as(i32, @intCast(row_count)) - 1 and config.wrap_navigation) {
                table_state.selectCell(
                    @intCast(table_state.selected_row + 1),
                    0,
                );
            }
        }

        // Auto-start editing in new cell if editable
        const new_col: usize = @intCast(@max(0, table_state.selected_col));
        if (new_col < table_schema.columns.len and table_schema.columns[new_col].editable) {
            if (table_state.getRow(@intCast(@max(0, table_state.selected_row)))) |row| {
                const value = row.get(table_schema.columns[new_col].name);
                var format_buf: [128]u8 = undefined;
                const text = value.format(&format_buf);
                table_state.startEditing(text);
                result.edit_started = true;
            }
        }

        result.selection_changed = true;
        return;
    }

    // Cursor movement within edit buffer
    if (ctx.input.keyPressed(.left)) {
        if (table_state.edit_cursor > 0) {
            table_state.edit_cursor -= 1;
        }
        return;
    }
    if (ctx.input.keyPressed(.right)) {
        if (table_state.edit_cursor < table_state.edit_len) {
            table_state.edit_cursor += 1;
        }
        return;
    }
    if (ctx.input.keyPressed(.home)) {
        table_state.edit_cursor = 0;
        return;
    }
    if (ctx.input.keyPressed(.end)) {
        table_state.edit_cursor = table_state.edit_len;
        return;
    }

    // Backspace: delete char before cursor
    if (ctx.input.keyPressed(.backspace)) {
        if (table_state.edit_cursor > 0) {
            // Shift characters left
            var i: usize = table_state.edit_cursor - 1;
            while (i < table_state.edit_len - 1) : (i += 1) {
                table_state.edit_buffer[i] = table_state.edit_buffer[i + 1];
            }
            table_state.edit_len -= 1;
            table_state.edit_cursor -= 1;
        }
        return;
    }

    // Delete: delete char at cursor
    if (ctx.input.keyPressed(.delete)) {
        if (table_state.edit_cursor < table_state.edit_len) {
            // Shift characters left
            var i: usize = table_state.edit_cursor;
            while (i < table_state.edit_len - 1) : (i += 1) {
                table_state.edit_buffer[i] = table_state.edit_buffer[i + 1];
            }
            table_state.edit_len -= 1;
        }
        return;
    }

    // Character input
    if (ctx.input.text_input_len > 0) {
        const text = ctx.input.text_input[0..ctx.input.text_input_len];
        for (text) |ch| {
            if (ch >= 32 and ch < 127) {
                if (table_state.edit_len < types.MAX_EDIT_BUFFER - 1) {
                    // Shift characters right
                    var i: usize = table_state.edit_len;
                    while (i > table_state.edit_cursor) : (i -= 1) {
                        table_state.edit_buffer[i] = table_state.edit_buffer[i - 1];
                    }
                    table_state.edit_buffer[table_state.edit_cursor] = ch;
                    table_state.edit_len += 1;
                    table_state.edit_cursor += 1;
                }
            }
        }
    }
}

fn commitEdit(
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    result: *AdvancedTableResult,
) void {
    if (table_state.selected_row < 0 or table_state.selected_col < 0) return;

    const row_idx: usize = @intCast(table_state.selected_row);
    const col_idx: usize = @intCast(table_state.selected_col);

    if (col_idx >= table_schema.columns.len) return;

    const col_def = &table_schema.columns[col_idx];
    const edit_text = table_state.getEditText();

    // Parse text to CellValue based on column type
    const new_value = parseValue(edit_text, col_def.column_type);

    // Check if value changed
    if (table_state.original_value) |orig| {
        if (new_value.eql(orig)) {
            return; // No change
        }
    }

    // Update the row
    if (table_state.getRow(row_idx)) |row| {
        row.set(col_def.name, new_value) catch {};
        table_state.markDirty(row_idx);
        result.cell_edited = true;

        // Lookup & Auto-fill (Phase 7)
        if (col_def.hasLookup()) {
            performLookupAndAutoFill(table_state, table_schema, row, col_def, new_value, result);
        }

        // Call on_cell_changed callback (Phase 8)
        if (table_schema.on_cell_changed) |callback| {
            const old_value = table_state.original_value orelse CellValue{ .null_val = {} };
            callback(row_idx, col_idx, old_value, new_value);
        }
    }
}

/// Perform lookup in related table and auto-fill columns
fn performLookupAndAutoFill(
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
    row: *Row,
    col_def: *const ColumnDef,
    lookup_value: CellValue,
    result: *AdvancedTableResult,
) void {
    // Need DataStore to perform lookup
    const data_store = table_schema.data_store orelse return;

    // Get lookup configuration
    const lookup_table = col_def.lookup_table orelse return;
    const lookup_key = col_def.lookup_key_column orelse return;

    // Perform lookup
    const lookup_result = data_store.lookup(
        lookup_table,
        lookup_key,
        lookup_value,
        table_state.allocator,
    ) catch return;

    // If lookup found a match, auto-fill related columns
    if (lookup_result) |lookup_row| {
        defer {
            // Clean up the lookup row after use
            var mutable_lookup = lookup_row;
            mutable_lookup.deinit();
        }

        // Auto-fill columns based on mapping
        if (col_def.auto_fill_columns) |mappings| {
            for (mappings) |mapping| {
                const source_value = lookup_row.get(mapping.source_field);
                if (!source_value.isEmpty()) {
                    row.set(mapping.target_column, source_value) catch {};
                }
            }
        }

        result.lookup_success = true;
    } else {
        result.lookup_success = false;
    }
}

fn parseValue(text: []const u8, column_type: ColumnType) CellValue {
    return switch (column_type) {
        .string => CellValue{ .string = text },
        .integer => blk: {
            const val = std.fmt.parseInt(i64, text, 10) catch 0;
            break :blk CellValue{ .integer = val };
        },
        .float, .money => blk: {
            const val = std.fmt.parseFloat(f64, text) catch 0.0;
            break :blk CellValue{ .float = val };
        },
        .boolean => blk: {
            const lower = text;
            const is_true = std.mem.eql(u8, lower, "true") or
                std.mem.eql(u8, lower, "yes") or
                std.mem.eql(u8, lower, "1") or
                std.mem.eql(u8, lower, "Y");
            break :blk CellValue{ .boolean = is_true };
        },
        .date, .select, .lookup => CellValue{ .string = text },
    };
}

fn detectCRUDAction(
    table_state: *AdvancedTableState,
    table_schema: *const TableSchema,
) ?CRUDAction {
    // Check if previous row was valid
    if (table_state.prev_selected_row < 0) return null;

    const prev_row_idx: usize = @intCast(table_state.prev_selected_row);

    // Check if row was marked for deletion
    if (table_state.isDeleted(prev_row_idx)) {
        return .delete;
    }

    // Get the row (might have been deleted)
    const row = table_state.getRow(prev_row_idx) orelse return null;

    // Get snapshot for comparison
    const snapshot = table_state.getSnapshot(prev_row_idx);

    // Check if row is new (was in new_rows map)
    const is_new = table_state.isNew(prev_row_idx);

    if (is_new) {
        // Check if new row has any data
        if (rowHasData(row, table_schema)) {
            return .create;
        }
        return null; // Empty new row, no action
    }

    // Check if row was modified
    if (snapshot) |snap| {
        if (rowsAreDifferent(row, snap, table_schema)) {
            return .update;
        }
    } else if (table_state.isDirty(prev_row_idx)) {
        // No snapshot but marked dirty - assume update
        return .update;
    }

    return null;
}

fn rowHasData(row: *const Row, table_schema: *const TableSchema) bool {
    for (table_schema.columns) |col| {
        if (!col.visible) continue;
        const value = row.get(col.name);
        if (!value.isEmpty()) return true;
    }
    return false;
}

fn rowsAreDifferent(row: *const Row, snapshot: *const Row, table_schema: *const TableSchema) bool {
    for (table_schema.columns) |col| {
        if (!col.editable) continue;
        const current = row.get(col.name);
        const original = snapshot.get(col.name);
        if (!current.eql(original)) return true;
    }
    return false;
}

fn ensureSelectionVisible(table_state: *AdvancedTableState, visible_rows: usize) void {
    if (table_state.selected_row < 0) return;

    const row: usize = @intCast(table_state.selected_row);

    // Scroll to show selected row
    if (row < table_state.scroll_row) {
        table_state.scroll_row = row;
    } else if (row >= table_state.scroll_row + visible_rows) {
        table_state.scroll_row = row - visible_rows + 1;
    }
}

// =============================================================================
// Color Helpers
// =============================================================================

fn blendColor(base: Style.Color, overlay: Style.Color, alpha: f32) Style.Color {
    const inv_alpha = 1.0 - alpha;

    return Style.Color.rgba(
        @intFromFloat(@as(f32, @floatFromInt(base.r)) * inv_alpha + @as(f32, @floatFromInt(overlay.r)) * alpha),
        @intFromFloat(@as(f32, @floatFromInt(base.g)) * inv_alpha + @as(f32, @floatFromInt(overlay.g)) * alpha),
        @intFromFloat(@as(f32, @floatFromInt(base.b)) * inv_alpha + @as(f32, @floatFromInt(overlay.b)) * alpha),
        base.a,
    );
}

// =============================================================================
// Sorting
// =============================================================================

/// Sort rows by column value
fn sortRows(
    table_state: *AdvancedTableState,
    column_name: []const u8,
    direction: SortDirection,
) void {
    if (direction == .none) return;
    if (table_state.rows.items.len < 2) return;

    // Simple bubble sort (stable, works for small-medium datasets)
    // For large datasets, consider using std.mem.sort with a context
    const len = table_state.rows.items.len;
    var swapped = true;

    while (swapped) {
        swapped = false;
        for (0..len - 1) |i| {
            const val_a = table_state.rows.items[i].get(column_name);
            const val_b = table_state.rows.items[i + 1].get(column_name);
            const cmp = val_a.compare(val_b);

            const should_swap = switch (direction) {
                .ascending => cmp > 0,
                .descending => cmp < 0,
                .none => false,
            };

            if (should_swap) {
                // Swap rows usando std.mem.swap (seguro para structs con punteros internos)
                // NOTA: Row contiene StringHashMap que tiene punteros a buckets.
                // El swap mueve el struct completo, no clona los datos.
                // Los punteros obtenidos via getRow() se invalidan tras sort.
                std.mem.swap(Row, &table_state.rows.items[i], &table_state.rows.items[i + 1]);

                // Swap state map entries
                swapRowStates(table_state, i, i + 1);

                swapped = true;
            }
        }
    }
}

/// Swap state map entries between two row indices
fn swapRowStates(table_state: *AdvancedTableState, idx_a: usize, idx_b: usize) void {
    // Helper to swap a single map's entries
    const swapInMap = struct {
        fn swap(map: anytype, a: usize, b: usize) void {
            const val_a = map.get(a);
            const val_b = map.get(b);

            if (val_a != null and val_b != null) {
                // Both exist - no change needed (both stay)
            } else if (val_a) |v| {
                // Only a exists - move to b
                _ = map.remove(a);
                map.put(b, v) catch {};
            } else if (val_b) |v| {
                // Only b exists - move to a
                _ = map.remove(b);
                map.put(a, v) catch {};
            }
            // Neither exists - nothing to do
        }
    }.swap;

    swapInMap(&table_state.dirty_rows, idx_a, idx_b);
    swapInMap(&table_state.new_rows, idx_a, idx_b);
    swapInMap(&table_state.deleted_rows, idx_a, idx_b);
    swapInMap(&table_state.validation_errors, idx_a, idx_b);
}

// =============================================================================
// Search Helpers
// =============================================================================

/// Case-insensitive prefix match for incremental search
fn startsWithIgnoreCase(haystack: []const u8, needle: []const u8) bool {
    if (needle.len > haystack.len) return false;
    if (needle.len == 0) return true;

    for (needle, 0..) |needle_char, i| {
        const haystack_char = haystack[i];
        // Simple ASCII case-insensitive comparison
        const needle_lower = if (needle_char >= 'A' and needle_char <= 'Z')
            needle_char + 32
        else
            needle_char;
        const haystack_lower = if (haystack_char >= 'A' and haystack_char <= 'Z')
            haystack_char + 32
        else
            haystack_char;

        if (needle_lower != haystack_lower) return false;
    }
    return true;
}

// =============================================================================
// Tests
// =============================================================================

test "AdvancedTable basic rendering" {
    var ctx = try Context.init(std.testing.allocator, 800, 600);
    defer ctx.deinit();

    var table_state = AdvancedTableState.init(std.testing.allocator);
    defer table_state.deinit();

    const columns = [_]ColumnDef{
        .{ .name = "id", .title = "ID", .width = 50, .editable = false },
        .{ .name = "name", .title = "Name", .width = 150 },
        .{ .name = "value", .title = "Value", .width = 100 },
    };

    const table_schema = TableSchema{
        .table_name = "test",
        .columns = &columns,
    };

    ctx.beginFrame();
    ctx.layout.row_height = 200;

    _ = advancedTable(&ctx, &table_state, &table_schema);

    // Should generate commands
    try std.testing.expect(ctx.commands.items.len > 0);

    ctx.endFrame();
}

test "blendColor" {
    const white = Style.Color.rgb(255, 255, 255);
    const black = Style.Color.rgb(0, 0, 0);

    const gray = blendColor(white, black, 0.5);
    try std.testing.expectEqual(@as(u8, 127), gray.r);
    try std.testing.expectEqual(@as(u8, 127), gray.g);
    try std.testing.expectEqual(@as(u8, 127), gray.b);
}

test "AdvancedTableResult lookup_success field" {
    var result = AdvancedTableResult{};

    // Default is null (no lookup attempted)
    try std.testing.expect(result.lookup_success == null);

    // Can be set to true (lookup found)
    result.lookup_success = true;
    try std.testing.expect(result.lookup_success.? == true);

    // Can be set to false (lookup not found)
    result.lookup_success = false;
    try std.testing.expect(result.lookup_success.? == false);
}

test "AdvancedTableState callback fields" {
    var table_state = AdvancedTableState.init(std.testing.allocator);
    defer table_state.deinit();

    // Initial state
    try std.testing.expectEqual(@as(u64, 0), table_state.last_callback_time_ms);
    try std.testing.expectEqual(@as(i32, -1), table_state.last_notified_row);

    // Can be updated
    table_state.last_callback_time_ms = 1000;
    table_state.last_notified_row = 5;

    try std.testing.expectEqual(@as(u64, 1000), table_state.last_callback_time_ms);
    try std.testing.expectEqual(@as(i32, 5), table_state.last_notified_row);
}

test "ColumnDef hasLookup" {
    // Column without lookup
    const col_no_lookup = ColumnDef{
        .name = "test",
        .title = "Test",
    };
    try std.testing.expect(!col_no_lookup.hasLookup());

    // Column with lookup enabled but no config
    const col_partial = ColumnDef{
        .name = "test",
        .title = "Test",
        .enable_lookup = true,
    };
    try std.testing.expect(!col_partial.hasLookup()); // Missing table/key

    // Column with full lookup config
    const col_full = ColumnDef{
        .name = "test",
        .title = "Test",
        .enable_lookup = true,
        .lookup_table = "other_table",
        .lookup_key_column = "id",
    };
    try std.testing.expect(col_full.hasLookup());
}

test "startsWithIgnoreCase" {
    // Basic match
    try std.testing.expect(startsWithIgnoreCase("Hello World", "Hello"));
    try std.testing.expect(startsWithIgnoreCase("Hello World", "hello"));
    try std.testing.expect(startsWithIgnoreCase("hello world", "HELLO"));

    // Empty needle matches everything
    try std.testing.expect(startsWithIgnoreCase("anything", ""));

    // Non-match
    try std.testing.expect(!startsWithIgnoreCase("Hello", "World"));
    try std.testing.expect(!startsWithIgnoreCase("Hi", "Hello"));

    // Needle longer than haystack
    try std.testing.expect(!startsWithIgnoreCase("Hi", "Hello World"));
}