/**
 * 路由中间件
 * @author yutent<yutent.io@gmail.com>
 * @date 2020/09/18 15:16:29
 */

import { readonlyProp } from '../lib.js'

export default function (req, res, next) {
  var debug = this.get('debug')
  var spa = this.get('spa')

  // 1. 先判断控制器是否存在
  if (!this.$load(spa ? 'index' : req.app)) {
    return res.error(`Controller [${req.app}] not found`, 404)
  }

  // 2. 默认二级路由为index
  if (req.path.length < 1 && spa === false) {
    req.path.push('index')
  }

  // 3. 实例化控制器
  this.$load(spa ? 'index' : req.app)
    .then(async Module => {
      let mod, route, act
      let err = ''

      if (Module) {
        mod = new Module()

        readonlyProp(mod, 'context', this)
        readonlyProp(mod, 'request', req)
        readonlyProp(mod, 'response', res)
        readonlyProp(mod, 'name', req.app)

        // 4. 优先执行__main__方法
        if (mod.__main__) {
          try {
            let r = await mod.__main__()
            if (r === false) {
              return
            }
          } catch (err) {
            return Promise.reject(err)
          }
        }

        if (spa) {
          return mod.indexAction.apply(mod, req.path)
        } else {
          route = req.path.shift()
          act = route + 'Action'

          if (mod[act]) {
            return mod[act].apply(mod, req.path)
          } else {
            err = new Error(`Action [${route}] not found`)
            err.status = 404
          }
        }
      } else {
        err = new Error(`Controller [${req.app}] load error`)
        err.status = 500
      }

      return Promise.reject(err)
    })
    .catch(err => {
      console.error(err)
      res.error(debug ? err.stack || err : err, err.status || 500)
    })
}