const std = @import("std");
const lib = @import("zig_civ");
const rl = @import("raylib");

const screen_offset_x: f32 = 400.0; // center of 800px screen
const screen_offset_y: f32 = 225.0; // center of 450px screen

fn draw_hex(hex: lib.hex.HexCell) !void {
    var corners: [6]lib.hex.Point = undefined;
    for (0..6) |i| {
        const corner = lib.hex.calculate_hex_corners(hex.center, hex.outer_radius, i);
        corners[i] = corner;
    }

    for (0..6) |i| {
        const start = corners[i];
        const end = corners[@mod(i + 1, 6)];

        const start_x: i32 = @intFromFloat(@round(start.x + screen_offset_x));
        const start_y: i32 = @intFromFloat(@round(start.y + screen_offset_y));
        const end_x: i32 = @intFromFloat(@round(end.x + screen_offset_x));
        const end_y: i32 = @intFromFloat(@round(end.y + screen_offset_y));

        rl.drawLine(start_x, start_y, end_x, end_y, .black);
    }

    const center_x: i32 = @intFromFloat(@round(hex.center.x + screen_offset_x - 10));
    const center_y: i32 = @intFromFloat(@round(hex.center.y + screen_offset_y - 6));

    var buf: [64]u8 = undefined;
    const text = try std.fmt.bufPrintZ(&buf, "{d} {d}", .{ hex.cubic.q, hex.cubic.r });
    rl.drawText(text, center_x, center_y, 12, .black);
}

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

    // Axial template: 7x7 grid, center at [3][3], indexed [r+3][q+3]
    // Hexagon shape for radius 3
    //const template = [7][7]u1{
    ////  q: -3  -2  -1   0   1   2   3
    //.{ 0, 0, 0, 1, 1, 1, 1 }, // r = -3
    //.{ 0, 0, 1, 1, 1, 1, 1 }, // r = -2
    //.{ 0, 1, 1, 1, 1, 1, 1 }, // r = -1
    //.{ 1, 1, 1, 1, 1, 1, 1 }, // r =  0
    //.{ 1, 1, 1, 1, 1, 1, 0 }, // r =  1
    //.{ 1, 1, 1, 1, 1, 0, 0 }, // r =  2
    //.{ 1, 1, 1, 1, 0, 0, 0 }, // r =  3
    //};

    //const template_rombus = [7][7]u1{
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //.{ 1, 1, 1, 1, 1, 1, 1 },
    //};

    const template_left_triangle = [7][7]u1{
        .{ 1, 1, 1, 1, 1, 1, 1 },
        .{ 1, 1, 1, 1, 1, 1, 0 },
        .{ 1, 1, 1, 1, 1, 0, 0 },
        .{ 1, 1, 1, 1, 0, 0, 0 },
        .{ 1, 1, 1, 0, 0, 0, 0 },
        .{ 1, 1, 0, 0, 0, 0, 0 },
        .{ 1, 0, 0, 0, 0, 0, 0 },
    };

    const template = template_left_triangle;

    var grid = try lib.world.generateFromTemplate(3, &template, 40.0, allocator);
    defer grid.deinit(allocator);

    // Initialization
    const screenWidth = 800;
    const screenHeight = 450;
    const fps = 60;

    rl.initWindow(screenWidth, screenHeight, "raylib.hex-zig [core] example - basic window");
    defer rl.closeWindow();

    rl.setTargetFPS(fps);

    // Main game loop
    while (!rl.windowShouldClose()) {
        rl.beginDrawing();
        defer rl.endDrawing();

        rl.clearBackground(.white);

        for (grid.items) |cell| {
            try draw_hex(cell);
        }
    }
}