import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import viteTsconfigPaths from "vite-tsconfig-paths";
import checker from "vite-plugin-checker";
import { readFileSync } from "node:fs";
import { dirname, resolve } from "node:path";
import { fileURLToPath } from "node:url";

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

// https://vite.dev/config/
export default defineConfig(() => {
  // Read package.json for version info
  const packageJson = JSON.parse(readFileSync("./package.json", "utf-8"));

  return {
    base: getViteBasePath(),
    plugins: [
      react(),
      viteTsconfigPaths(), // Enables TypeScript path mapping from tsconfig.json
      checker({
        typescript: true
      })
    ],
    server: {
      port: 3000,
      open: true
    },
    build: {
      outDir: "build",
      sourcemap: true
    },
    resolve: {
      alias: {
        "@": resolve(__dirname, "src")
      }
    },
    define: {
      // Expose app version and build date as Vite environment variables
      "import.meta.env.VITE_APP_VERSION": JSON.stringify(packageJson.version),
      "import.meta.env.VITE_APP_DATE": JSON.stringify(new Date().toISOString())
    }
  };
});

const getViteBasePath = (): string => {
  const basePath = process.env.VITE_BASE_PATH;
  if (!basePath) return "/";
  const cleanPath = basePath.replace(/^\/|\/$/g, "");
  // Vite expects both leading and trailing slashes if not root
  return `/${cleanPath}/`;
};