import { asyncRouterMap, constantRouterMap } from 'src/router';

function hasPermission(roles, route) {
  if (route.meta && route.meta.role) {
    return roles.some(role => route.meta.role.indexOf(role) >= 0)
  } else {
    return true
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param roles
 * @returns {Array.<T>|*}
 */
function filterAsyncRouter(asyncRouterMap, roles) {
    let accessedRouters = asyncRouterMap.filter(route => {
        if(hasPermission(roles, route)) {
            if(route.children && route.children.length) {
                route.children = filterAsyncRouter(route.children, roles)
            }
            return true
        }
        return false
    })
    return accessedRouters
}


const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },

  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers;
      state.routers = constantRouterMap.concat(routers);
    }
  },

  actions: {
    GenerateRoutes({ commit }, data) {
      return new Promise(resolve => {
        const { roles } = data;
        let accessedRouters
        if (roles.indexOf('admin') >= 0) {
          accessedRouters = asyncRouterMap
        } else {
          accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
        }
        commit('SET_ROUTERS', accessedRouters);
        resolve();
      })
    }
  }
};


export default permission;