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

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 getBuildInfo() {
    const pkg = JSON.parse(
        fs.readFileSync(path.join(__dirname, "package.json"), "utf8"),
    );
    let commitHash = "unknown";
    try {
        commitHash = execSync("git rev-parse --short HEAD", {
            encoding: "utf8",
        }).trim();
    } catch (_) {
        // not a git repo or git not available
    }
    let commitHashFull = "unknown";
    try {
        commitHashFull = execSync("git rev-parse HEAD", {
            encoding: "utf8",
        }).trim();
    } catch (_) {
        // not a git repo or git not available
    }
    return {
        version: pkg.version,
        license: pkg.license,
        author: pkg.author,
        commitHash,
        commitHashFull,
        buildDate: new Date().toISOString().slice(0, 10),
    };
}

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

    const buildInfo = getBuildInfo();
    console.log("Build info:", buildInfo);

    const define = {
        __BUILD_VERSION__: JSON.stringify(buildInfo.version),
        __BUILD_LICENSE__: JSON.stringify(buildInfo.license),
        __BUILD_AUTHOR__: JSON.stringify(buildInfo.author),
        __BUILD_COMMIT__: JSON.stringify(buildInfo.commitHash),
        __BUILD_COMMIT_FULL__: JSON.stringify(buildInfo.commitHashFull),
        __BUILD_DATE__: JSON.stringify(buildInfo.buildDate),
    };

    // 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" },
    );

    for (const distDir of [DIST_CHROME, DIST_FIREFOX]) {
        ensureDir(path.join(distDir, "src", "popup"));
        ensureDir(path.join(distDir, "src", "background"));
        ensureDir(path.join(distDir, "src", "content"));

        // bundle popup JS with esbuild (inlines ethers, libsodium, etc.)
        await esbuild.build({
            entryPoints: [path.join(SRC, "popup", "index.js")],
            bundle: true,
            format: "iife",
            outfile: path.join(distDir, "src", "popup", "index.js"),
            platform: "browser",
            target: ["chrome110", "firefox110"],
            minify: true,
            define,
        });

        // bundle background script
        await esbuild.build({
            entryPoints: [path.join(SRC, "background", "index.js")],
            bundle: true,
            format: "iife",
            outfile: path.join(distDir, "src", "background", "index.js"),
            platform: "browser",
            target: ["chrome110", "firefox110"],
            minify: true,
            define,
        });

        // bundle content script
        await esbuild.build({
            entryPoints: [path.join(SRC, "content", "index.js")],
            bundle: true,
            format: "iife",
            outfile: path.join(distDir, "src", "content", "index.js"),
            platform: "browser",
            target: ["chrome110", "firefox110"],
            minify: true,
            define,
        });

        // bundle inpage script (injected into page context, separate file)
        await esbuild.build({
            entryPoints: [path.join(SRC, "content", "inpage.js")],
            bundle: true,
            format: "iife",
            outfile: path.join(distDir, "src", "content", "inpage.js"),
            platform: "browser",
            target: ["chrome110", "firefox110"],
            minify: true,
            define,
        });

        // copy popup HTML
        fs.copyFileSync(
            path.join(SRC, "popup", "index.html"),
            path.join(distDir, "src", "popup", "index.html"),
        );

        // 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();