import { login, logout, getInfo } from '@/api/user'
import { getToken, setToken, removeToken } from '@/utils/auth'
import router, { resetRouter } from '@/router'

const getDefaultState = () => {
  return {
    token: getToken(),
    userInfo: {},
    roles: [],
    links: {}
  }
}

const state = getDefaultState()

const mutations = {
  RESET_STATE: (state) => {
    Object.assign(state, getDefaultState())
  },
  SET_TOKEN: (state, token) => {
    state.token = token
  },
  SET_USER_INFO: (state, userInfo) => {
    state.userInfo = userInfo
  },
  SET_ROLES: (state, roles) => {
    state.roles = roles
  },
  SET_LINKS: (state, links) => {
    state.links = links
  }
}

const actions = {
  // user login
  login() {
    return new Promise((resolve, reject) => {
      login().then(response => {
        console.log(response)
        resolve()
      }).catch(error => {
        reject(error)
      })
    })
  },

  // get user info
  getInfo({ commit }) {
    return new Promise((resolve, reject) => {
      getInfo().then(response => {
        const { data } = response

        if (!data) {
          return reject('Verification failed, please Login again.')
        }

        const { userInfo, roles, links } = data

        // roles must be a non-empty array
        if (!roles || roles.length <= 0) {
          reject('用户权限为空，请联系管理员授权！')
        }

        commit('SET_ROLES', roles)
        commit('SET_USER_INFO', userInfo)
        commit('SET_LINKS', links)
        resolve(data)
      }).catch(error => {
        reject(error)
      })
    })
  },

  setToken({ commit }, token) {
    return new Promise((resolve, reject) => {
      commit('SET_TOKEN', token)
      setToken(token)
      resolve()
    })
  },
  // user logout
  logout({ commit, state, dispatch }) {
    return new Promise((resolve, reject) => {
      logout().then(res => {
        commit('SET_TOKEN', '')
        commit('SET_ROLES', [])
        removeToken()
        resetRouter()

        // reset visited views and cached views
        // to fixed https://github.com/PanJiaChen/vue-element-admin/issues/2485
        dispatch('tagsView/delAllViews', null, { root: true })

        resolve(res)
      }).catch(error => {
        reject(error)
      })
    })
  },

  // remove token
  resetToken({ commit }) {
    return new Promise(resolve => {
      commit('SET_TOKEN', '')
      commit('SET_ROLES', [])
      removeToken()
      resolve()
    })
  },

  // dynamically modify permissions
  async changeRoles({ commit, dispatch }, role) {
    const token = role + '-token'

    commit('SET_TOKEN', token)
    setToken(token)

    const { roles } = await dispatch('getInfo')

    resetRouter()

    // generate accessible routes map based on roles
    const accessRoutes = await dispatch('permission/generateRoutes', roles, { root: true })
    // dynamically add accessible routes
    router.addRoutes(accessRoutes)

    // reset visited views and cached views
    dispatch('tagsView/delAllViews', null, { root: true })
  }
}

export default {
  namespaced: true,
  state,
  mutations,
  actions
}