import { execFileSync } from 'node:child_process';
import { readFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import react from '@vitejs/plugin-react';
import { defineConfig } from 'vitest/config';

interface PackageJson {
  version: string;
}

const pkg = JSON.parse(readFileSync(new URL('./package.json', import.meta.url), 'utf-8')) as PackageJson;

/**
 * `X-Kvitt-App-Version` (SPEC §14.3.1): the commit count of the checkout at build time (`git rev-list --count HEAD`,
 * as the app's release builds count). Without git or `.git` (the image's Node stage), `KVITT_VERSION_CODE` when set,
 * else 1.
 */
function versionCode(): number {
  const counted = gitCommitCount();
  if (counted !== null) return counted;
  const fromEnv = process.env.KVITT_VERSION_CODE;
  return fromEnv !== undefined && /^[1-9]\d*$/.test(fromEnv) ? Number(fromEnv) : 1;
}

function gitCommitCount(): number | null {
  try {
    const count = execFileSync('git', ['rev-list', '--count', 'HEAD'], {
      cwd: fileURLToPath(new URL('.', import.meta.url)),
      encoding: 'utf-8',
      stdio: ['ignore', 'pipe', 'ignore'],
    }).trim();
    return /^[1-9]\d*$/.test(count) ? Number(count) : null;
  } catch {
    // No git binary, or no repository around web/.
    return null;
  }
}

/** API paths of contracts/openapi.yaml; `npm run dev` forwards them to a local kvitt-server (README). */
const API_PREFIXES = [
  '/health',
  '/setup',
  '/invites',
  '/me',
  '/users',
  '/devices',
  '/accounts',
  '/categories',
  '/recurring-templates',
  '/sync',
  '/settlements',
  '/apk',
  '/analytics',
  '/cards',
];
const devApi = process.env.KVITT_DEV_API ?? 'http://localhost:8080';

export default defineConfig({
  base: '/app/',
  plugins: [react()],
  define: {
    __KVITT_VERSION_NAME__: JSON.stringify(pkg.version),
    __KVITT_VERSION_CODE__: JSON.stringify(versionCode()),
  },
  server: {
    // web/ itself, plus contracts/ for the one contract file the app imports at build time: W2's keyword table
    // (SPEC §15.7, D-055). Vite refuses `?raw` imports outside these paths, in Vitest as well as the dev server, and
    // matches the id with its query, so the entry must be the directory, not the file.
    fs: { allow: ['.', '../contracts'] },
    proxy: Object.fromEntries(API_PREFIXES.map((prefix) => [prefix, { target: devApi, changeOrigin: true }])),
  },
  build: {
    outDir: 'dist',
    sourcemap: false,
    rolldownOptions: {
      output: {
        // Libraries in their own chunks: they change less often than the app, so browsers keep them across deploys.
        codeSplitting: {
          groups: [
            { name: 'react', test: /node_modules[\\/](react|react-dom|scheduler)[\\/]/ },
            // Recharts and its dependencies, loaded only by the analytics pages (S-11, S-12, Insights), so the
            // shared vendor chunk stays small (it was 516 kB with them).
            {
              name: 'charts',
              test: /node_modules[\\/](recharts|victory-vendor|d3-[a-z-]+|internmap|@reduxjs|redux|redux-thunk|react-redux|reselect|immer|decimal\.js-light|es-toolkit|eventemitter3|tiny-invariant|clsx|use-sync-external-store)[\\/]/,
            },
            { name: 'vendor', test: /node_modules[\\/]/ },
          ],
        },
      },
    },
  },
  test: {
    environment: 'jsdom',
    setupFiles: ['src/test/setup.ts'],
    include: ['src/**/*.test.{ts,tsx}'],
    css: { modules: { classNameStrategy: 'non-scoped' } },
    // No file-system module cache (node_modules/.vitest-cache): it once served a stale `import.meta.glob` of
    // catalog.ts (fixed in 83f5293), and the whole suite runs in seconds without it, so every run transforms afresh.
    fsModuleCache: false,
  },
});