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 Tileset = sh0rk.Tileset;\n`;
out += `const Trigger = sh0rk.Trigger;\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: 34,
            height: 16,
            name: "Rpg",
        };
    }

    if (tset.source.includes("Cave")) {
        tilesheet = {
            width: 14,
            height: 5,
            name: "Cave",
        }
    }
});

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

const genMap = (tiles) => {
    out += `pub const data = [${tiles.data.length}]u9{\n    `;

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

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

const genColl = coll => {
    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);

        let comment = "";
        if (obj.name !== "") {
            comment = ` // ${obj.name}`;
        }

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

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

const genAct = act => {
    out += `pub const triggers = [_]Trigger{\n`;

    act.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);
        let direction = "";
        let dialogue = "";

        obj.properties.forEach(prop => {
            if (prop.name === "direction") {
                direction = prop.value;
            }

            if (prop.name === "dialogue") {
                dialogue = prop.value;
            }
        });

        if (direction === "" || dialogue === "") {
            throw new Error("Missing direction or dialogue");
        }

        out += `    Trigger{.aura = Rect{.base = Point{.x = ${x}, .y = ${y}}, .width = ${width}, .height = ${height}}, .direction = Direction.${direction}, .dialogue = "${dialogue}"}, // ${obj.name}\n`;
    });

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

map.layers.forEach(layer => {
    if (layer.name == "map") {
        genMap(layer);
    }

    if (layer.name == "coll") {
        genColl(layer);
    }

    if (layer.name == "act") {
        genAct(layer);
    }

    if (layer.name == "spc") {
        layer.objects.forEach(obj => {
            if (obj.name === "mara_start") {
                out += `pub const start_point = Point{ .x = ${Math.round(obj.x)}, .y = ${Math.round(obj.y)} };\n\n`;
            }
        });
    }
});

await Deno.writeTextFile(outFname, out);