import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import { viteStaticCopy } from "vite-plugin-static-copy";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));

export default defineConfig({
  plugins: [
    react(),
    // PDF.js needs its cmaps (character maps for CID fonts) and
    // standard fonts (Helvetica/Times/Courier metrics) to position
    // text-layer spans correctly. Without them, PDFs with embedded
    // CID fonts or unembedded standard fonts get rendered to canvas
    // OK but their textLayer overlays land in the wrong place — text
    // appears unselectable or selection jumps to a different region.
    // We serve both directories straight from `node_modules/pdfjs-dist`.
    viteStaticCopy({
      targets: [
        {
          src: resolve(__dirname, "node_modules/pdfjs-dist/cmaps") + "/[!.]*",
          dest: "cmaps",
        },
        {
          src: resolve(__dirname, "node_modules/pdfjs-dist/standard_fonts") + "/[!.]*",
          dest: "standard_fonts",
        },
      ],
    }),
  ],
  resolve: {
    alias: {
      "@shared": resolve(__dirname, "src/shared"),
      "@engine": resolve(__dirname, "src/engine"),
      "@anchor": resolve(__dirname, "src/anchor"),
      "@source": resolve(__dirname, "src/source"),
      "@binder": resolve(__dirname, "src/binder"),
      "@work":   resolve(__dirname, "src/work"),
      "@app":    resolve(__dirname, "src/app"),
    },
  },
  server: {
    fs: {
      // Allow Vite to serve /fixtures/pdfs/*.pdf from the project root.
      allow: [resolve(__dirname)],
    },
  },
  optimizeDeps: {
    // pdfjs-dist ships its worker as a .mjs Vite needs to handle.
    exclude: ["pdfjs-dist"],
  },
});