import type { PathLike } from "fs";
import { access } from "fs/promises";
import { dirname, resolve } from "path";
import sharp, { type OverlayOptions } from "sharp";
import { parseArgs } from "util";
import { formatImage, makeKZ } from "./common";
import { readFile } from "fs/promises";
import { writeFile } from "fs/promises";
import { rm } from "fs/promises";
import { mkdir } from "fs/promises";
import { stat } from "fs/promises";
import { readdir } from "fs/promises";

const { values: args } = parseArgs({
    args: Bun.argv,
    options: {
        images: {
            type: "string",
            short: "i",
            default: "images/images.json"
        },
        imagedir: {
            type: "string",
            short: "d",
            default: "images"
        },
        outdir: {
            type: "string",
            short: "o",
            default: "data"
        },
        basefile: {
            type: "string",
            short: "b",
            default: "base.png"
        },
        throw: {
            type: "boolean",
            short: "t",
            default: false
        }
    },
    strict: true,
    allowPositionals: true
});

const dirExists = async(path: PathLike) => access(path).then(() => true, () => false);
const imagesPath = resolve(args.images ?? "images.json");
const imageDir = resolve(args.imagedir ?? dirname(imagesPath));
const baseFile = resolve(args.basefile ?? "base.png");
const outDir = resolve(args.outdir ?? "data");
const throwOnMissing = !!args.throw;
if (!await dirExists(imageDir)) {
    console.error("Image directory %s does not exist.", imageDir);
    process.exit(1);
}

const ap = (p: string) => resolve(p, "assets/minecraft/textures/entity/bed");
// const ap = (p: string) => resolve(p, "../img");
await rm(`${outDir}/assets`, { recursive: true, force: true });
await mkdir(ap(outDir), { recursive: true });

export interface Image {
    animation?: { frametime?: number; };
    frames?: { start: number; end?: number; } | Array<number>;
    name: string;
    sizeMultiplier?: number;
    rotate?: number;
    flip?: "horizontal" | "vertical";
}

export interface Detail {
    pos: [number, number];
    size: [number, number];
    cut: [number, number];
    rotate?: number;
    flip?: "horizontal" | "vertical";
}


export interface Details {
    top: Detail;
    middle: Detail;
    bottom: Detail;
}

export interface Config {
    defaultSize: [width: number, height: number];
    details: Details;
    images: Array<Image>;
}

const config = await Bun.file(imagesPath).json() as Config;

for (const image of config.images) {
    let img: string | Array<string>;
    if (await stat(`${imageDir}/${image.name}`).then(s => s.isDirectory(), () => false)) {
        img = await readdir(`${imageDir}/${image.name}`).then(files => files.map(f => `${imageDir}/${image.name}/${f}`).sort());
    } else {
        const [file] = await Array.fromAsync(new Bun.Glob(`${image.name}.*`).scan({ onlyFiles: true, cwd: imageDir }));
        if (!file) {
            console.error("Image %s does not exist.", image.name);
            if (throwOnMissing) {
                process.exit(1);
            }
            continue;
        }
        img = `${imageDir}/${file}`
    }
    console.log("Processing %s", image.name);
    
    const { isImage, result } = await formatImage(image.name, baseFile, config, img);
    await result.toFile(`${ap(outDir)}/${image.name}.png`);
    if (!isImage) {
        await writeFile(`${ap(outDir)}/${image.name}.png.mcmeta`, JSON.stringify({ animation: image.animation ?? {} }));
    }
}