import { execFileSync } from "child_process";
import * as chokidar from "chokidar";
import esbuild from "esbuild";
import fs from "fs";
import { globSync } from "glob";
import path from "path";
import { cwd } from "process";
import process from "process";
import { fileURLToPath } from "url";

const __dirname = fileURLToPath(new URL(".", import.meta.url));

let authentikProjectRoot = __dirname + "../";
try {
    // Use the package.json file in the root folder, as it has the current version information.
    authentikProjectRoot = execFileSync("git", ["rev-parse", "--show-toplevel"], {
        encoding: "utf8",
    }).replace("\n", "");
} catch (_exc) {
    // We probably don't have a .git folder, which could happen in container builds
}
const rootPackage = JSON.parse(fs.readFileSync(path.join(authentikProjectRoot, "./package.json")));

const isProdBuild = process.env.NODE_ENV === "production";

const apiBasePath = process.env.AK_API_BASE_PATH || "";

const envGitHashKey = "GIT_BUILD_HASH";

const definitions = {
    "process.env.NODE_ENV": JSON.stringify(isProdBuild ? "production" : "development"),
    "process.env.CWD": JSON.stringify(cwd()),
    "process.env.AK_API_BASE_PATH": JSON.stringify(apiBasePath),
};

// All is magic is just to make sure the assets are copied into the right places. This is a very
// stripped down version of what the rollup-copy-plugin does, without any of the features we don't
// use, and using globSync instead of globby since we already had globSync lying around thanks to
// Typescript. If there's a third argument in an array entry, it's used to replace the internal path
// before concatenating it all together as the destination target.

const otherFiles = [
    ["node_modules/@patternfly/patternfly/patternfly.min.css", "."],
    ["node_modules/@patternfly/patternfly/assets/**", ".", "node_modules/@patternfly/patternfly/"],
    ["src/custom.css", "."],
    ["src/common/styles/**", "."],
    ["src/assets/images/**", "./assets/images"],
    ["./icons/*", "./assets/icons"],
];

const isFile = (filePath) => fs.statSync(filePath).isFile();
function nameCopyTarget(src, dest, strip) {
    const target = path.join(dest, strip ? src.replace(strip, "") : path.parse(src).base);
    return [src, target];
}

for (const [source, rawdest, strip] of otherFiles) {
    const matchedPaths = globSync(source);
    const dest = path.join("dist", rawdest);
    const copyTargets = matchedPaths.map((path) => nameCopyTarget(path, dest, strip));
    for (const [src, dest] of copyTargets) {
        if (isFile(src)) {
            fs.mkdirSync(path.dirname(dest), { recursive: true });
            fs.copyFileSync(src, dest);
        }
    }
}

// This starts the definitions used for esbuild: Our targets, our arguments, the function for
// running a build, and three options for building: watching, building, and building the proxy.
// Ordered by largest to smallest interface to build even faster
const interfaces = [
    ["admin/AdminInterface/AdminInterface.ts", "admin"],
    ["user/UserInterface.ts", "user"],
    ["flow/FlowInterface.ts", "flow"],
    ["standalone/api-browser/index.ts", "standalone/api-browser"],
    ["rac/index.ts", "rac"],
    ["standalone/loading/index.ts", "standalone/loading"],
    ["polyfill/poly.ts", "."],
];

const baseArgs = {
    bundle: true,
    write: true,
    sourcemap: true,
    minify: isProdBuild,
    splitting: true,
    treeShaking: true,
    external: ["*.woff", "*.woff2"],
    tsconfig: "./tsconfig.json",
    loader: { ".css": "text", ".md": "text" },
    define: definitions,
    format: "esm",
    logOverride: {
        /**
         * HACK: Silences issue originating in ESBuild.
         *
         * @see {@link https://github.com/evanw/esbuild/blob/b914dd30294346aa15fcc04278f4b4b51b8b43b5/internal/logger/msg_ids.go#L211 ESBuild source}
         * @expires 2025-08-11
         */
        "invalid-source-url": "silent",
    },
};

function getVersion() {
    let version = rootPackage.version;
    if (process.env[envGitHashKey]) {
        version = `${version}+${process.env[envGitHashKey]}`;
    }
    return version;
}

async function buildOneSource(source, dest) {
    const DIST = path.join(__dirname, "./dist", dest);
    console.log(`[${new Date(Date.now()).toISOString()}] Starting build for target ${source}`);

    try {
        const start = Date.now();
        await esbuild.build({
            ...baseArgs,
            entryPoints: [`./src/${source}`],
            entryNames: `[dir]/[name]-${getVersion()}`,
            outdir: DIST,
        });
        const end = Date.now();
        console.log(
            `[${new Date(end).toISOString()}] Finished build for target ${source} in ${
                Date.now() - start
            }ms`,
        );
        return 0;
    } catch (exc) {
        console.error(`[${new Date(Date.now()).toISOString()}] Failed to build ${source}: ${exc}`);
        return 1;
    }
}

async function buildAuthentik(interfaces) {
    const code = await Promise.allSettled(
        interfaces.map(([source, dest]) => buildOneSource(source, dest)),
    );
    const finalCode = code.reduce((a, res) => a + res.value, 0);
    if (finalCode > 0) {
        return 1;
    }
    return 0;
}

let timeoutId = null;
function debouncedBuild() {
    if (timeoutId !== null) {
        clearTimeout(timeoutId);
    }
    timeoutId = setTimeout(() => {
        console.clear();
        buildAuthentik(interfaces);
    }, 250);
}

if (process.argv.length > 2 && (process.argv[2] === "-h" || process.argv[2] === "--help")) {
    console.log(`Build the authentikUI

options:
  -w, --watch: Build all ${interfaces.length} interfaces
  -p, --proxy: Build only the polyfills and the loading application
  -h, --help: This help message
`);
    process.exit(0);
}

if (process.argv.length > 2 && (process.argv[2] === "-w" || process.argv[2] === "--watch")) {
    console.log("Watching ./src for changes");
    chokidar.watch("./src").on("all", (event, path) => {
        if (!["add", "change", "unlink"].includes(event)) {
            return;
        }
        if (!/(\.css|\.ts|\.js)$/.test(path)) {
            return;
        }
        debouncedBuild();
    });
} else if (process.argv.length > 2 && (process.argv[2] === "-p" || process.argv[2] === "--proxy")) {
    // There's no watch-for-proxy, sorry.
    process.exit(
        await buildAuthentik(
            interfaces.filter(([_, dest]) => ["standalone/loading", "."].includes(dest)),
        ),
    );
} else {
    // And the fallback: just build it.
    process.exit(await buildAuthentik(interfaces));
}