import fastify, {
  FastifyError,
  FastifyInstance,
  FastifyReply,
  FastifyRequest,
} from "fastify";
import helmet from "@fastify/helmet";
import { IncomingMessage, Server, ServerResponse } from "http";
import { RouterMap } from "decorators/router";
import { mongoose } from "@typegoose/typegoose";
import logger from "logger/logger";
import config from "config/config";

const zReqParserPlugin = require("plugins/zReqParser");

const zTokenParserPlugin = require("plugins/zTokenParser");

const apiAuthPlugin = require("plugins/apiauth");

const fs = require("fs");
const join = require("path").join;

require("./common/Extend");

export class ApiServer {
  server: FastifyInstance<Server, IncomingMessage, ServerResponse>;

  public constructor() {
    this.server = fastify({ logger: true, trustProxy: true });
    this.registerPlugins();
  }
  private registerPlugins() {
    this.server.register(require("@fastify/formbody"));
    this.server.register(zReqParserPlugin);
    this.server.register(helmet, { hidePoweredBy: false });
    this.server.register(zTokenParserPlugin);

    this.server.register(apiAuthPlugin, {
      secret: config.api.token_secret,
      expiresIn: config.api.token_expiresIn,
    });

    this.server.register(require("@fastify/cors"), {});
  }

  private registerRouter() {
    logger.log("register api routers");
    let self = this;
    for (let [controller, config] of RouterMap.decoratedRouters) {
      for (let data of config.data) {
        logger.info(
          "add router",
          data.method || "all",
          data.path,
          `${data.target.constructor.name}.${controller.name}()`
        );
        // @ts-ignore
        self.server[data.method || "all"](
          data.path,
          {
            preValidation: async function (
              request: FastifyRequest,
              reply: FastifyReply
            ) {
              request.roles = config.roles;
              await this.apiAuth(request, reply);
            },
          },
          controller
        );
      }
    }
  }
  /**
   * 加载所有的controller
   */
  initControllers() {
    logger.info("Bootstrap controllers...");
    const controllers = join(__dirname, "./controllers");
    fs.readdirSync(controllers)
      .filter((file: string) => ~file.search(/^[^.].*\.(ts|js)$/))
      .forEach((file: any) => {
        // logger.log(file);
        return require(join(controllers, file));
      });
  }
  async connectDB() {
    const options = {
      useNewUrlParser: true,
      poolSize: 5,
      keepAlive: true,
      keepAliveInitialDelay: 300000,
      useUnifiedTopology: true,
    };
    const uri = config.db_main;
    logger.info(`connect to  ${uri} ...`);
    try {
      // await mongoose.createConnection(uri, options)
      await mongoose.connect(uri, options);
      logger.log("DB Connected");
    } catch (err) {
      logger.log(`DB Connection Error: ${err.message}`);
    }
  }
  private setErrHandler() {
    this.server.setNotFoundHandler(function (
      request: any,
      reply: { send: (arg0: { errcode: number; errmsg: string }) => void }
    ) {
      reply.send({ errcode: 404, errmsg: "page not found" });
    });
    this.server.setErrorHandler(function (
      error: FastifyError,
      request: FastifyRequest,
      reply: FastifyReply
    ) {
      let statusCode = (error && error.statusCode) || 100;
      if (statusCode >= 500) {
        logger.error(error);
      } else if (statusCode >= 400) {
        logger.info(error);
      } else {
        logger.error(error);
      }
      reply.code(200).send({
        errcode: statusCode,
        errmsg: error ? error.message : "unknown error",
      });
    });
  }
  /**
   * 格式化接口返回数据, 统一封装成如下格式
   * {
   *     code: 0,
   *     msg?: '',
   *     data: any
   * }
   * @private
   */
  private setFormatSend() {
    this.server.addHook(
      "preSerialization",
      async (request: FastifyRequest, reply: FastifyReply, payload) => {
        reply.header("X-Powered-By", "PHP/5.4.16");
        // @ts-ignore
        if (!payload.errcode) {
          payload = {
            errcode: 0,
            data: payload,
          };
        }
        return payload;
      }
    );
  }
  public async start() {
    let self = this;
    return new Promise(async (resolve, reject) => {
      await self.connectDB();
      self.initControllers();
      self.registerRouter();
      self.setErrHandler();
      self.setFormatSend();
      // new Schedule().start();
      this.server.listen(
        { port: config.api.port },
        (err: any, address: any) => {
          if (err) {
            logger.log(err);
            process.exit(0);
          }
          resolve && resolve(address);
        }
      );
    });
  }
}