/**
 * 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 async function (req, res, next) {
    let debug = this.get('debug')
    let dynamic = this.get('dynamic')
    let name = dynamic ? 'index' : req.controller
    let ModuleController = this.$load(name)
    let paths = req.path.concat()

    // 1. 先判断控制器是否存在
    if (!ModuleController) {
      return res.error(`Controller [${name}] not found`, 404)
    }

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

    // 3. 实例化控制器
    try {
      let route, act
      let err = ''

      let 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, paths)
      } else {
        route = paths.shift()
        act = route + 'Action'

        if (ctrol[act]) {
          return ctrol[act].apply(ctrol, paths)
        } else {
          err = new Error(`Action [${route}] not found`)
          err.status = 404
        }
      }

      res.error(debug ? err.stack || err : err, err.status || 500)
    } catch (err) {
      console.error(err)
    }
  }
}