//! Hello World - Basic zcatgui example
//!
//! Demonstrates:
//! - Initializing the backend
//! - Creating a framebuffer
//! - Basic rendering
//! - Event loop

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

const Framebuffer = zcatgui.render.Framebuffer;
const SoftwareRenderer = zcatgui.render.SoftwareRenderer;
const Sdl2Backend = zcatgui.backend.Sdl2Backend;
const Color = zcatgui.Color;
const Command = zcatgui.Command;

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

    // Initialize backend
    var backend = try Sdl2Backend.init("zcatgui - Hello World", 800, 600);
    defer backend.deinit();

    // Create framebuffer
    var fb = try Framebuffer.init(allocator, 800, 600);
    defer fb.deinit();

    // Create renderer
    var renderer = SoftwareRenderer.init(&fb);

    var running = true;
    var frame: u32 = 0;

    while (running) {
        // Poll events
        while (backend.pollEvent()) |event| {
            switch (event) {
                .quit => running = false,
                .key => |key| {
                    if (key.key == .escape and key.pressed) {
                        running = false;
                    }
                },
                .resize => |size| {
                    try fb.resize(size.width, size.height);
                },
                else => {},
            }
        }

        // Clear
        renderer.clear(Color.background);

        // Draw some rectangles
        renderer.execute(Command.rect(50, 50, 200, 100, Color.primary));
        renderer.execute(Command.rect(300, 50, 200, 100, Color.success));
        renderer.execute(Command.rect(550, 50, 200, 100, Color.danger));

        // Draw rectangle outline
        renderer.execute(Command.rectOutline(50, 200, 700, 100, Color.border));

        // Animate a rectangle
        const x = @as(i32, @intCast(50 + (frame % 600)));
        renderer.execute(Command.rect(x, 350, 100, 100, Color.warning));

        // Draw some lines
        renderer.execute(Command.line(50, 500, 750, 500, Color.foreground));
        renderer.execute(Command.line(400, 450, 400, 550, Color.foreground));

        // Present
        backend.present(&fb);

        frame += 1;

        // Control frame rate (approx 60 FPS)
        const ts = std.posix.timespec{ .sec = 0, .nsec = 16 * std.time.ns_per_ms };
        _ = std.posix.system.nanosleep(&ts, null);
    }
}