import cors from "@fastify/cors";
import jwt from "@fastify/jwt";
import multipart from "@fastify/multipart";
import Fastify from "fastify";
import { ZodError } from "zod";
import { MAX_IMAGE_UPLOAD_BYTES, mediaStorage } from "./media-storage.js";
import { prisma } from "./prisma.js";
import { registerAdminRoutes } from "./routes/admin.js";
import { registerMemoryRoutes } from "./routes/memory.js";
import { registerPublicRoutes } from "./routes/public.js";
import { registerWecomRoutes } from "./routes/wecom.js";

export async function createServer() {
  const app = Fastify({
    logger: {
      level: process.env.LOG_LEVEL ?? "info",
    },
  });

  await app.register(cors, {
    origin: true,
    credentials: true,
  });

  app.addContentTypeParser(["application/xml", "text/xml"], { parseAs: "string" }, (_request, body, done) => {
    done(null, body);
  });

  await app.register(jwt, {
    secret: process.env.JWT_SECRET ?? "dev-only-change-me-before-production",
  });

  await mediaStorage.ensureReady();
  await app.register(multipart, {
    limits: {
      files: 1,
      fileSize: MAX_IMAGE_UPLOAD_BYTES,
    },
  });
  app.setErrorHandler((error: unknown, _request, reply) => {
    if (error instanceof ZodError) {
      app.log.warn(error);
      reply.status(400).send({
        message: error.issues[0]?.message ?? "请求参数不正确",
      });
      return;
    }

    const normalized = error instanceof Error ? error : new Error("Unknown server error");
    const maybeStatus = "statusCode" in normalized && typeof normalized.statusCode === "number" ? normalized.statusCode : undefined;
    const statusCode = maybeStatus && maybeStatus >= 400 ? maybeStatus : 500;
    if (statusCode >= 500) app.log.error(normalized);
    else app.log.warn(normalized);
    reply.status(statusCode).send({
      message: statusCode === 500 ? "服务暂时不可用" : normalized.message,
    });
  });

  if (process.env.MINIAPP_MEMORY_DB === "1") {
    if (process.env.MINIAPP_ALLOW_EPHEMERAL_DATA !== "1") {
      throw new Error("检测到 MINIAPP_MEMORY_DB=1，但未显式允许临时数据。请使用 npm run dev:api:memory，或配置 DATABASE_URL 后使用 npm run dev:api。");
    }
    app.log.warn("临时内存模式已启用：后台配置只保存在当前进程，API 重启后会恢复默认。需要持久化请配置 DATABASE_URL 并使用 npm run dev:api。");
    await registerMemoryRoutes(app);
  } else {
    if (!process.env.DATABASE_URL) {
      throw new Error("DATABASE_URL 未配置。首页后台配置需要 PostgreSQL 持久化；请复制 .env.example 配置数据库，或仅在临时演示时使用 npm run dev:api:memory。");
    }
    await prisma.$connect();
    app.log.info("PostgreSQL 持久化模式已启用。");
    app.addHook("onClose", async () => {
      await prisma.$disconnect();
    });
    await registerPublicRoutes(app);
    await registerAdminRoutes(app);
    await registerWecomRoutes(app);
  }

  return app;
}