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

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

export function createRouter() {
  return function (req, res, next) {
    let debug = this.get('debug')
    let dynamic = this.get('dynamic')

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

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

    // 3. 实例化控制器
    this.$load(dynamic ? 'index' : req.controller)
      .then(async ModuleController => {
        let ctrol, route, act
        let err = ''

        if (ModuleController) {
          ctrol = new ModuleController()

          readonlyProp(ctrol, 'context', this)
          readonlyProp(ctrol, 'request', req)
          readonlyProp(ctrol, 'response', res)
          readonlyProp(ctrol, 'name', req.controller)

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

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

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

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