//! Help Widget Demo - Shows keybinding help in different modes
//!
//! Run with: zig build help-demo

const std = @import("std");
const zcatui = @import("zcatui");

const Terminal = zcatui.Terminal;
const Rect = zcatui.Rect;
const Buffer = zcatui.Buffer;
const Style = zcatui.Style;
const Color = zcatui.Color;
const Block = zcatui.widgets.Block;
const Borders = zcatui.widgets.Borders;
const Help = zcatui.widgets.Help;
const KeyBinding = zcatui.widgets.KeyBinding;
const HelpMode = zcatui.widgets.HelpMode;

const bindings = [_]KeyBinding{
    .{ .key = "q", .description = "Quit", .group = "General" },
    .{ .key = "?", .description = "Toggle help", .group = "General" },
    .{ .key = "up/k", .description = "Move up", .group = "Navigation" },
    .{ .key = "down/j", .description = "Move down", .group = "Navigation" },
    .{ .key = "left/h", .description = "Move left", .group = "Navigation" },
    .{ .key = "right/l", .description = "Move right", .group = "Navigation" },
    .{ .key = "PgUp", .description = "Page up", .group = "Navigation" },
    .{ .key = "PgDn", .description = "Page down", .group = "Navigation" },
    .{ .key = "Home", .description = "Go to start", .group = "Navigation" },
    .{ .key = "End", .description = "Go to end", .group = "Navigation" },
    .{ .key = "Enter", .description = "Select item", .group = "Actions" },
    .{ .key = "Space", .description = "Toggle selection", .group = "Actions" },
    .{ .key = "Tab", .description = "Next panel", .group = "Actions" },
    .{ .key = "Ctrl+C", .description = "Copy", .group = "Edit" },
    .{ .key = "Ctrl+V", .description = "Paste", .group = "Edit" },
    .{ .key = "Ctrl+Z", .description = "Undo", .group = "Edit" },
};

const modes = [_]HelpMode{ .single_line, .compact, .multi_line, .full };
const mode_names = [_][]const u8{ "Single Line", "Compact", "Multi Line", "Full" };

/// State for the demo
const State = struct {
    current_mode: usize = 0,
    running: bool = true,
};

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
    defer _ = gpa.deinit();
    const allocator = gpa.allocator();

    var term = try Terminal.init(allocator);
    defer term.deinit();

    var state = State{};

    while (state.running) {
        try term.drawWithContext(&state, render);

        if (try term.pollEvent(100)) |event| {
            switch (event) {
                .key => |key| {
                    switch (key.code) {
                        .char => |c| {
                            if (c == 'q') state.running = false;
                            if (c >= '1' and c <= '4') {
                                state.current_mode = c - '1';
                            }
                        },
                        .left => {
                            if (state.current_mode > 0) state.current_mode -= 1;
                        },
                        .right => {
                            if (state.current_mode < modes.len - 1) state.current_mode += 1;
                        },
                        .esc => state.running = false,
                        else => {},
                    }
                },
                else => {},
            }
        }
    }
}

fn render(state: *State, area: Rect, buf: *Buffer) void {
    // Main border
    const block = Block.init()
        .title(" Help Widget Demo ")
        .setBorders(Borders.all)
        .borderStyle((Style{}).fg(Color.cyan));
    block.render(area, buf);

    // Mode tabs
    var x: u16 = 2;
    for (mode_names, 0..) |name, i| {
        const style = if (i == state.current_mode)
            (Style{}).fg(Color.black).bg(Color.cyan).bold()
        else
            (Style{}).fg(Color.white);

        _ = buf.setString(x, 1, " ", style);
        _ = buf.setString(x + 1, 1, name, style);
        _ = buf.setString(x + 1 + @as(u16, @intCast(name.len)), 1, " ", style);
        x += @as(u16, @intCast(name.len)) + 3;
    }

    // Help content area
    const content_area = Rect.init(1, 3, area.width -| 2, area.height -| 5);

    const help_block = Block.init()
        .setBorders(Borders.all)
        .title(" Keybindings ")
        .borderStyle((Style{}).fg(Color.rgb(80, 80, 80)));
    help_block.render(content_area, buf);

    const inner = Rect.init(2, 4, area.width -| 4, area.height -| 7);

    // Help widget
    const key_style = (Style{}).fg(Color.yellow).bold();
    const help = Help.init(&bindings)
        .setMode(modes[state.current_mode])
        .setKeyStyle(key_style);

    help.render(inner, buf);

    // Footer
    _ = buf.setString(
        2,
        area.height -| 1,
        "Press 1-4 or left/right to change mode, q to quit",
        (Style{}).fg(Color.rgb(100, 100, 100)),
    );
}