import { defineConfig } from "vite";
import solidPlugin from "vite-plugin-solid";
import { crx } from "@crxjs/vite-plugin";
import { copyFileSync, mkdirSync, readFileSync, writeFileSync } from "fs";
import { resolve } from "path";

const target = process.env.BUILD_TARGET || "chrome";
const manifestPath = target === "firefox" ? "./manifest.firefox.json" : "./manifest.json";
const manifest = JSON.parse(readFileSync(manifestPath, "utf-8"));
if (target === "chrome") {
  manifest.web_accessible_resources = [{
    matches: ["<all_urls>"],
    resources: ["<dynamic_resource>"],
  }];
}
const passkeyE2E = process.env.PEACH_E2E_PASSKEYS === "1";
const outDir = target === "firefox" ? "dist-firefox" : "dist-chrome";

// Copy the pdf.js worker into the build output so the popup can load it via
// chrome.runtime.getURL('pdf.worker.min.mjs'). The pdfjs-dist module's default
// workerSrc points inside node_modules, which is not reachable from a packaged
// extension — the worker file must sit alongside the rest of the assets.
const copyPdfJsWorker = {
  name: "copy-pdfjs-worker",
  closeBundle() {
    mkdirSync(outDir, { recursive: true });
    copyFileSync(
      resolve("node_modules/pdfjs-dist/build/pdf.worker.min.mjs"),
      resolve(outDir, "pdf.worker.min.mjs"),
    );
    if (target === "chrome") {
      const outputManifest = resolve(outDir, "manifest.json");
      const builtManifest = JSON.parse(readFileSync(outputManifest, "utf8"));
      writeFileSync(outputManifest, `${JSON.stringify(builtManifest, null, 2)}\n`);
    }
  },
};

export default defineConfig({
  plugins: [
    solidPlugin(),
    crx({ manifest, browser: target === "firefox" ? "firefox" : "chrome" }),
    copyPdfJsWorker,
  ],
  base: "./",
  define: {
    __PEACH_E2E_PASSKEYS__: JSON.stringify(passkeyE2E),
    __PEACH_DEBUG__: false,
  },
  build: {
    outDir,
    // emptyOutDir must stay false. When true, Vite tries to remove the
    // contents of the outDir before each build, which throws EPERM on FUSE
    // and some mounted filesystems and aborts the whole build. Overwriting
    // in place works everywhere.
    emptyOutDir: false,
    // The MV3 service worker has no `document`. Vite's module-preload helper
    // injects <link rel=modulepreload> via document.getElementsByTagName, and
    // it runs synchronously inside every dynamic import() that carries chunk
    // deps. In the worker that throws `ReferenceError: document is not defined`
    // synchronously — escaping the import's own .catch() and tearing down the
    // caller (e.g. passkey-get persisting signCount via fireSyncTrigger).
    // Disabling preload makes the helper a no-op; the link hints are only a
    // page-load micro-optimisation and the popup loads fine without them.
    modulePreload: false,
    target: "esnext",
    rollupOptions: {
      // HV-2: the offscreen document (Chrome only — Firefox has no
      // chrome.offscreen) must be bundled and emitted so the background can
      // load it via chrome.offscreen.createDocument. Firefox capability-checks
      // chrome.offscreen and never references it.
      input:
        target === "firefox"
          ? undefined
          : { offscreen: resolve("src/background/offscreen.html") },
      output: {
        manualChunks(id) {
          if (id.includes("node_modules/solid-js")) return "vendor-solid";
          if (id.includes("node_modules/otpauth")) return "vendor-otp";
          if (id.includes("node_modules/papaparse")) return "vendor-parse";
        },
      },
    },
  },
});