//! Directory Tree Demo - File browser widget
//!
//! Run with: zig build dirtree-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 DirectoryTree = zcatui.widgets.DirectoryTree;
// TreeSymbols is in dirtree_mod, not exported directly
const DirTreeSymbols = zcatui.widgets.dirtree_mod.TreeSymbols;

/// State for the demo
const State = struct {
    tree: *DirectoryTree,
    use_ascii: bool = false,
    running: bool = true,
    path: []const u8,
};

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();

    // Get current directory
    const start_path = std.fs.cwd().realpathAlloc(allocator, ".") catch "/tmp";
    defer allocator.free(start_path);

    // Create directory tree
    var tree = DirectoryTree.init(allocator, start_path) catch |err| {
        std.debug.print("Failed to open directory: {}\n", .{err});
        return;
    };
    defer tree.deinit();

    var state = State{
        .tree = &tree,
        .path = start_path,
    };

    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 == 'j') state.tree.moveDown();
                            if (c == 'k') state.tree.moveUp();
                            if (c == 'l' or c == 'o') state.tree.toggleExpand() catch {};
                            if (c == 'h') state.tree.collapse() catch {};
                            if (c == '.') state.tree.toggleHidden() catch {};
                            if (c == 'i') state.use_ascii = !state.use_ascii;
                            if (c == 'g') state.tree.goToTop();
                            if (c == 'G') state.tree.goToBottom();
                        },
                        .up => state.tree.moveUp(),
                        .down => state.tree.moveDown(),
                        .left => state.tree.collapse() catch {},
                        .right => state.tree.toggleExpand() catch {},
                        .enter => state.tree.toggleExpand() catch {},
                        .home => state.tree.goToTop(),
                        .end => state.tree.goToBottom(),
                        .esc => state.running = false,
                        else => {},
                    }
                },
                else => {},
            }
        }
    }
}

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

    // Path display
    var path_buf: [256]u8 = undefined;
    const current_path = state.tree.getSelectedPath() orelse state.path;
    const path_display = std.fmt.bufPrint(&path_buf, " {s} ", .{current_path}) catch "...";
    _ = buf.setString(2, 1, path_display, (Style{}).fg(Color.yellow));

    // Tree view
    const tree_area = Rect.init(1, 2, area.width -| 2, area.height -| 4);

    // Configure symbols based on preference
    if (state.use_ascii) {
        var configured = state.tree.setSymbols(DirTreeSymbols.ascii);
        configured.render(tree_area, buf);
    } else {
        state.tree.render(tree_area, buf);
    }

    // File info panel
    if (state.tree.getSelected()) |node| {
        var info_buf: [128]u8 = undefined;
        const info = std.fmt.bufPrint(&info_buf, "Selected: {s}", .{node.name}) catch "...";
        _ = buf.setString(2, area.height -| 2, info, (Style{}).fg(Color.white));
    }

    // Footer
    const footer = "j/k nav | l expand | h collapse | . hidden | i ascii | g/G top/bottom | q quit";
    _ = buf.setString(
        2,
        area.height -| 1,
        footer,
        (Style{}).fg(Color.rgb(100, 100, 100)),
    );
}