import fs from "node:fs";
import path from "node:path";
import { reactRouter } from "@react-router/dev/vite";
import tailwindcss from "@tailwindcss/vite";
import { defineConfig, loadEnv, type Plugin } from "vite";

/** 读取 git 短哈希(不依赖 git 命令) */
function readGitShortSha(cwd: string): string | null {
  try {
    const gitDir = path.join(cwd, ".git");
    const head = fs.readFileSync(path.join(gitDir, "HEAD"), "utf8").trim();
    let sha = head;
    if (head.startsWith("ref: ")) {
      const ref = head.slice(5);
      const refFile = path.join(gitDir, ref);
      if (fs.existsSync(refFile)) {
        sha = fs.readFileSync(refFile, "utf8").trim();
      } else {
        const packed = fs.readFileSync(path.join(gitDir, "packed-refs"), "utf8");
        const line = packed.split("\n").find((l) => l.endsWith(` ${ref}`));
        if (!line) return null;
        sha = line.split(" ")[0] ?? "";
      }
    }
    return /^[0-9a-f]{40}$/.test(sha) ? sha.slice(0, 7) : null;
  } catch {
    return null;
  }
}

/** 构建时注入 __APP_VERSION__ 并输出 version.json;优先 APP_VERSION,其次 git 短哈希,最后时间戳 */
function appVersion(): Plugin {
  const repoRoot = path.resolve(process.cwd(), "../..");
  const version = process.env.APP_VERSION?.trim() || readGitShortSha(repoRoot) || `build-${Date.now().toString(36)}`;
  return {
    name: "app-version",
    config() {
      return { define: { __APP_VERSION__: JSON.stringify(version) } };
    },
    generateBundle() {
      this.emitFile({
        type: "asset",
        fileName: "version.json",
        source: JSON.stringify({ version, builtAt: new Date().toISOString() }),
      });
    },
  };
}

export default defineConfig(({ mode }) => {
  const env = loadEnv(mode, process.cwd(), "");
  const apiTarget = env.VITE_API_TARGET || "http://localhost:4390";

  return {
    plugins: [tailwindcss(), reactRouter(), appVersion()],
    resolve: { tsconfigPaths: true },
    server: {
      port: 5180,
      strictPort: true,
      // 依赖装在仓库根 node_modules/.deno(deno workspace),vite 找不到 npm workspace 根,需显式放行
      fs: { allow: [path.resolve(process.cwd(), "../..")] },
      proxy: {
        "/api": { target: apiTarget, changeOrigin: true },
      },
    },
  };
});