//! Clipboard demo for zcatui.
//!
//! Demonstrates OSC 52 clipboard support:
//! - Copy text to system clipboard
//! - Copy to primary selection (X11)
//! - Clear clipboard
//!
//! Run with: zig build clipboard-demo
//!
//! Note: OSC 52 support varies by terminal. If clipboard operations
//! don't work, check your terminal's documentation.

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

const Terminal = zcatui.Terminal;
const Buffer = zcatui.Buffer;
const Rect = zcatui.Rect;
const Style = zcatui.Style;
const Color = zcatui.Color;
const Event = zcatui.Event;
const KeyCode = zcatui.KeyCode;
const Layout = zcatui.Layout;
const Constraint = zcatui.Constraint;
const Block = zcatui.widgets.Block;
const Borders = zcatui.widgets.Borders;
const Paragraph = zcatui.widgets.Paragraph;
const Clipboard = zcatui.clipboard;

const AppState = struct {
    running: bool = true,
    last_action: []const u8 = "Press a key to test clipboard",
    copy_count: u32 = 0,
};

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 = AppState{};

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

        if (try term.pollEvent(100)) |event| {
            try handleEvent(&state, &term, allocator, event);
        }
    }
}

fn handleEvent(state: *AppState, term: *Terminal, allocator: std.mem.Allocator, event: Event) !void {
    const writer = term.backend.stdout.deprecatedWriter();
    switch (event) {
        .key => |key| {
            switch (key.code) {
                .esc => state.running = false,
                .char => |c| {
                    switch (c) {
                        'q', 'Q' => state.running = false,
                        '1' => {
                            state.copy_count += 1;
                            var buf: [64]u8 = undefined;
                            const text = std.fmt.bufPrint(&buf, "Hello from zcatui #{d}!", .{state.copy_count}) catch "Hello!";
                            try Clipboard.copy(allocator, writer, text);
                            state.last_action = "Copied text to clipboard (Ctrl+V to paste)";
                        },
                        '2' => {
                            try Clipboard.copySmallTo(writer, "Primary selection text", .primary);
                            state.last_action = "Copied to primary (middle-click to paste)";
                        },
                        '3' => {
                            try Clipboard.copySmallTo(writer, "Both clipboard and primary!", .both);
                            state.last_action = "Copied to both clipboard and primary";
                        },
                        'c', 'C' => {
                            try Clipboard.clear(writer);
                            state.last_action = "Cleared clipboard";
                        },
                        else => {},
                    }
                },
                else => {},
            }
        },
        else => {},
    }
}

fn render(state: *AppState, area: Rect, buf: *Buffer) void {
    // Main layout
    const chunks = Layout.vertical(&.{
        Constraint.length(3), // Title
        Constraint.length(8), // Actions
        Constraint.length(5), // Status
        Constraint.min(0), // Help
    }).split(area);

    // Title
    renderTitle(chunks.get(0), buf);

    // Actions
    renderActions(chunks.get(1), buf);

    // Status
    renderStatus(state, chunks.get(2), buf);

    // Help
    renderHelp(chunks.get(3), buf);
}

fn renderTitle(area: Rect, buf: *Buffer) void {
    const block = Block.init()
        .title(" Clipboard Demo (OSC 52) ")
        .setBorders(Borders.all)
        .style(Style.default.fg(Color.cyan));
    block.render(area, buf);

    const inner = block.inner(area);
    _ = buf.setString(inner.left(), inner.top(), "Test clipboard operations in your terminal", Style.default);
}

fn renderActions(area: Rect, buf: *Buffer) void {
    const block = Block.init()
        .title(" Available Actions ")
        .setBorders(Borders.all)
        .style(Style.default.fg(Color.yellow));
    block.render(area, buf);

    const inner = block.inner(area);
    var y = inner.top();

    const actions = [_][]const u8{
        "1 - Copy text to clipboard",
        "2 - Copy to primary selection (X11)",
        "3 - Copy to both clipboard and primary",
        "c - Clear clipboard",
        "q - Quit",
    };

    for (actions) |action| {
        if (y < inner.bottom()) {
            _ = buf.setString(inner.left(), y, action, Style.default);
            y += 1;
        }
    }
}

fn renderStatus(state: *AppState, area: Rect, buf: *Buffer) void {
    const block = Block.init()
        .title(" Last Action ")
        .setBorders(Borders.all)
        .style(Style.default.fg(Color.green));
    block.render(area, buf);

    const inner = block.inner(area);
    _ = buf.setString(inner.left(), inner.top(), state.last_action, Style.default.fg(Color.white).bold());

    if (state.copy_count > 0) {
        var count_buf: [32]u8 = undefined;
        const count_text = std.fmt.bufPrint(&count_buf, "Total copies: {d}", .{state.copy_count}) catch "?";
        _ = buf.setString(inner.left(), inner.top() + 1, count_text, Style.default.dim());
    }
}

fn renderHelp(area: Rect, buf: *Buffer) void {
    const block = Block.init()
        .title(" Notes ")
        .setBorders(Borders.all)
        .style(Style.default.fg(Color.blue));
    block.render(area, buf);

    const inner = block.inner(area);
    var y = inner.top();

    const notes = [_][]const u8{
        "OSC 52 clipboard support varies by terminal.",
        "Supported: xterm, iTerm2, kitty, alacritty, WezTerm, foot",
        "tmux: enable with 'set -g set-clipboard on'",
        "Some terminals disable OSC 52 by default for security.",
    };

    for (notes) |note| {
        if (y < inner.bottom()) {
            _ = buf.setString(inner.left(), y, note, Style.default.dim());
            y += 1;
        }
    }
}