const fs = require("fs");
const path = require("path");
const { execSync } = require("child_process");

const DIST_CHROME = path.join(__dirname, "dist", "chrome");
const DIST_FIREFOX = path.join(__dirname, "dist", "firefox");
const SRC = path.join(__dirname, "src");

function ensureDir(dir) {
    fs.mkdirSync(dir, { recursive: true });
}

function copyDir(src, dest, opts = {}) {
    ensureDir(dest);
    const entries = fs.readdirSync(src, { withFileTypes: true });
    for (const entry of entries) {
        const srcPath = path.join(src, entry.name);
        const destPath = path.join(dest, entry.name);
        if (opts.skip && opts.skip.includes(entry.name)) {
            continue;
        }
        if (entry.isDirectory()) {
            copyDir(srcPath, destPath, opts);
        } else {
            fs.copyFileSync(srcPath, destPath);
        }
    }
}

function build() {
    console.log("Building AutistMask extension...");

    // compile tailwind CSS
    console.log("Compiling Tailwind CSS...");
    const tailwindInput = path.join(SRC, "popup", "styles", "main.css");
    const tailwindOutput = path.join(__dirname, "dist", "styles.css");
    ensureDir(path.join(__dirname, "dist"));
    execSync(
        `npx @tailwindcss/cli -i ${tailwindInput} -o ${tailwindOutput} --minify`,
        { stdio: "inherit" },
    );

    // copy source files (skip the styles dir, we compiled it)
    for (const distDir of [DIST_CHROME, DIST_FIREFOX]) {
        ensureDir(distDir);
        copyDir(path.join(SRC, "popup"), path.join(distDir, "src", "popup"), {
            skip: ["styles"],
        });
        copyDir(
            path.join(SRC, "background"),
            path.join(distDir, "src", "background"),
        );
        copyDir(
            path.join(SRC, "content"),
            path.join(distDir, "src", "content"),
        );
        copyDir(path.join(SRC, "shared"), path.join(distDir, "src", "shared"));

        // place compiled CSS next to popup HTML
        fs.copyFileSync(
            tailwindOutput,
            path.join(distDir, "src", "popup", "styles.css"),
        );
    }

    // copy manifests
    fs.copyFileSync(
        path.join(__dirname, "manifest", "chrome.json"),
        path.join(DIST_CHROME, "manifest.json"),
    );
    fs.copyFileSync(
        path.join(__dirname, "manifest", "firefox.json"),
        path.join(DIST_FIREFOX, "manifest.json"),
    );

    console.log("Build complete: dist/chrome/ and dist/firefox/");
}

build();