import { defineConfig, loadEnv, type PluginOption } from "vite";
import react from "@vitejs/plugin-react-swc";
import tsconfigPaths from "vite-tsconfig-paths";
import { viteStaticCopy } from "vite-plugin-static-copy";

const VALID_MODES = [
  "core",
  "proprietary",
  "saas",
  "desktop",
  "prototypes",
] as const;
type BuildMode = (typeof VALID_MODES)[number];

const TSCONFIG_MAP: Record<BuildMode, string> = {
  core: "./tsconfig.core.vite.json",
  proprietary: "./tsconfig.proprietary.vite.json",
  saas: "./tsconfig.saas.vite.json",
  desktop: "./tsconfig.desktop.vite.json",
  prototypes: "./tsconfig.prototypes.vite.json",
};

export default defineConfig(async ({ mode }) => {
  // Load env file based on `mode` in the current working directory.
  // Set the third parameter to '' to load all env regardless of the
  // `VITE_` prefix.
  const env = loadEnv(mode, process.cwd(), "");

  // Resolve the effective build mode.
  // Explicit --mode flags take precedence; otherwise default to proprietary
  // unless DISABLE_ADDITIONAL_FEATURES=true, in which case default to core.
  const effectiveMode: BuildMode = (VALID_MODES as readonly string[]).includes(
    mode,
  )
    ? (mode as BuildMode)
    : process.env.DISABLE_ADDITIONAL_FEATURES === "true"
      ? "core"
      : "proprietary";

  const tsconfigProject = TSCONFIG_MAP[effectiveMode];

  // Backend proxy target: default localhost:8080. Override via BACKEND_URL env var
  // so the top-level dev launcher can wire a dynamically-assigned backend port.
  const backendUrl = process.env.BACKEND_URL || "http://localhost:8080";
  const backendProxy = {
    target: backendUrl,
    changeOrigin: true,
    secure: false,
    xfwd: true,
  };

  // Shared between `vite` (dev) and `vite preview` (production-build serve, used
  // in CI/E2E) so the live test suite still resolves /api → :8080.
  const backendProxyConfig =
    effectiveMode === "desktop"
      ? undefined
      : {
          "/api": backendProxy,
          "/oauth2": backendProxy,
          "/saml2": backendProxy,
          "/login/oauth2": backendProxy,
          "/login/saml2": backendProxy,
          "/swagger-ui": backendProxy,
          "/v1/api-docs": backendProxy,
        };

  return {
    plugins: [
      react(),
      tsconfigPaths({
        projects: [tsconfigProject],
      }),
      // Set ANALYZE=true to emit dist/stats.html (treemap) alongside the
      // build; rollup-plugin-visualizer is ESM-only so we import dynamically.
      ...(process.env.ANALYZE === "true"
        ? [
            (await import("rollup-plugin-visualizer")).visualizer({
              filename: "dist/stats.html",
              template: "treemap",
              gzipSize: true,
              brotliSize: true,
              emitFile: false,
            }) as PluginOption,
          ]
        : []),
      viteStaticCopy({
        targets: [
          {
            //provides static pdfium so embedpdf can run without cdn
            src: "node_modules/@embedpdf/pdfium/dist/pdfium.wasm",
            dest: "pdfium",
          },
          {
            // Copy jscanify vendor files to dist
            src: "public/vendor/jscanify/*",
            dest: "vendor/jscanify",
          },
          {
            // pdfjs-dist CMap data for CJK / non-latin glyph mapping — required
            // when rendering PDFs inside workers where the default DOM fetch paths
            // aren't available.
            src: "node_modules/pdfjs-dist/cmaps/*",
            dest: "pdfjs/cmaps",
          },
          {
            // pdfjs-dist standard font data (Helvetica/Times/etc.) — needed so
            // workers can substitute non-embedded base 14 fonts without DOM access.
            src: "node_modules/pdfjs-dist/standard_fonts/*",
            dest: "pdfjs/standard_fonts",
          },
        ],
      }),
    ],
    server: {
      host: true,
      // make sure this port matches the devUrl port in tauri.conf.json file
      port: 5173,
      // Tauri expects a fixed port, fail if that port is not available
      strictPort: true,
      watch: {
        // tell vite to ignore watching `src-tauri`
        ignored: ["**/src-tauri/**"],
      },
      // Only use proxy in web mode - Tauri handles backend connections directly
      proxy: backendProxyConfig,
    },
    preview: {
      host: true,
      port: 5173,
      strictPort: true,
      proxy: backendProxyConfig,
    },
    // base: "./" produces relative asset URLs which work when dist/ is served
    // at any path (e.g. Spring Boot bundling the frontend at /). But under
    // `vite preview` for deep SPA routes (e.g. /workflow/sign/<token>), the
    // browser resolves ./assets/X.js relative to the current path → 404, then
    // SPA fallback returns index.html as text/html and React never mounts.
    // VITE_BUILD_FOR_PREVIEW=1 (set by the CI playwright steps) overrides to
    // an absolute base so deep-route asset paths resolve to /assets/...
    base: env.RUN_SUBPATH
      ? `/${env.RUN_SUBPATH}`
      : process.env.VITE_BUILD_FOR_PREVIEW === "1"
        ? "/"
        : "./",
  };
});