if (Deno.args.length !== 2) {
    console.log("Usage: ./genmap.js <path-to-map-file> <output-fname>");
    Deno.exit(1);
}

const mapFile = Deno.args[0];
const outFname = Deno.args[1];

var out = "";

const data = await Deno.readTextFile(mapFile);
const map = JSON.parse(data);

out += `// Generated by ./src/tools/genmap.js ${mapFile}, DO NOT EDIT\n\n`;

out += `const sh0rk = @import("../sh0rk.zig");\n`;

out += `const Direction = sh0rk.Direction;\n`;
out += `const Point = sh0rk.Point;\n`;
out += `const Rect = sh0rk.Rect;\n\n`;

out += `pub const width = ${map.width};\n`;
out += `pub const height = ${map.height};\n\n`;

let tiles = map.layers[0];

let tilesheet = {
    width: 10,
    height: 5,
};

map.tilesets.forEach(tset => {
    if (tset.source.includes("kenney")) {
        tilesheet = {
            width: 17,
            height: 8,
        };
    }

    if (tset.source.includes("Cave")) {
        tilesheet = {
            width: 10,
            height: 5,
        }
    }
});

out += `pub const ts_width = ${tilesheet.width};\n`;
out += `pub const ts_height = ${tilesheet.height};\n\n`;

out += `pub const data = [${tiles.data.length}]u8{\n    `;

tiles.data.forEach((tile, index) => {
    tile -= 1;
    out += `${tile},`;
    if (index !== 0 && index % 10 === 0) {
        out += "\n    ";
    } else {
        out += " ";
    }
});

out += "\n};\n\n";

if (map.layers.length >= 2) {
    let coll = map.layers[1];

    out += `pub const coll = [_]Rect{\n`;

    coll.objects.forEach(obj => {
        const x = Math.round(obj.x);
        const y = Math.round(obj.y);
        const width = Math.round(obj.width);
        const height = Math.round(obj.height);

        out += `    Rect{.base = Point{.x = ${x}, .y = ${y}}, .width = ${width}, .height = ${height}},\n`;
    });

    out += "};\n\n";
}

await Deno.writeTextFile(outFname, out);