const Koa = require('koa');
const app = new Koa();
const views = require('koa-views');
const json = require('koa-json');
const onerror = require('koa-onerror');
const bodyparser = require('koa-bodyparser');
const logger = require('koa-logger');

const session = require('koa-generic-session');
const redisStore = require('koa-redis');
const { redis_conf } = require('./conf/db_config');

const cors = require('koa2-cors');
const crawlerRouter = require('./routes/crawler');
const indexRouter = require('./routes/index');
const adminRouter = require('./routes/admin');
const { redisInfo, corsOrigin } = require('./conf/conf');
// error handler
onerror(app);

// 使用koa2-cors中间件
app.use(
  cors({
    origin: function (ctx) {
      return corsOrigin;
    },
    // 它的值是一个布尔值，表示是否允许发送Cookie。默认情况下，Cookie不包括在CORS请求之中
    credentials: true,
  })
);

// middlewares
app.use(
  bodyparser({
    enableTypes: ['json', 'form', 'text'],
  })
);
app.use(json());
app.use(logger());
app.use(require('koa-static')(__dirname + '/public'));

app.use(
  views(__dirname + '/views', {
    extension: 'pug',
  })
);

// 设置一下加密cookie的key
app.keys = ['n1i@c#l$i%a^'];

// 引入session中间件
app.use(
  session({
    key: 'cat.sid', // cookie的name
    prefix: 'cat.sess', // redis key 的前缀

    // 设置cookie配置
    cookie: {
      path: '/', // 作用于全局，根目录
      httpOnly: true, // 禁止修改
      maxAge: 24 * 60 * 60 * 1000, // 设置过期时间
    },
    store: redisStore(redisInfo),
  })
);

// logger
app.use(async (ctx, next) => {
  const start = new Date();
  await next();
  const ms = new Date() - start;
  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`);
});

// routes
app.use(indexRouter.routes(), indexRouter.allowedMethods());
app.use(crawlerRouter.routes(), crawlerRouter.allowedMethods());
app.use(adminRouter.routes(), adminRouter.allowedMethods());

// error-handling
app.on('error', (err, ctx) => {
  console.error('server error', err, ctx);
});

module.exports = app;