// Copyright 2021 The casbin Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package controllers

import (
	"encoding/json"
	"fmt"
	"strings"

	"github.com/astaxie/beego/utils/pagination"
	"github.com/casbin/casdoor/object"
	"github.com/casbin/casdoor/original"
	"github.com/casbin/casdoor/util"
)

// GetGlobalUsers
// @Title GetGlobalUsers
// @Description get global users
// @Success 200 {array} object.User The Response object
// @router /get-global-users [get]
func (c *ApiController) GetGlobalUsers() {
	limit := c.Input().Get("pageSize")
	page := c.Input().Get("p")
	if limit == "" || page == "" {
		c.Data["json"] = object.GetMaskedUsers(object.GetGlobalUsers())
		c.ServeJSON()
	} else {
		limit := util.ParseInt(limit)
		paginator := pagination.SetPaginator(c.Ctx, limit, int64(object.GetGlobalUserCount()))
		users := object.GetPaginationGlobalUsers(paginator.Offset(), limit)
		c.ResponseOk(users, paginator.Nums())
	}
}

// GetUsers
// @Title GetUsers
// @Description
// @Param   owner     query    string  true        "The owner of users"
// @Success 200 {array} object.User The Response object
// @router /get-users [get]
func (c *ApiController) GetUsers() {
	owner := c.Input().Get("owner")
	limit := c.Input().Get("pageSize")
	page := c.Input().Get("p")
	if limit == "" || page == "" {
		c.Data["json"] = object.GetMaskedUsers(object.GetUsers(owner))
		c.ServeJSON()
	} else {
		limit := util.ParseInt(limit)
		paginator := pagination.SetPaginator(c.Ctx, limit, int64(object.GetUserCount(owner)))
		users := object.GetPaginationUsers(owner, paginator.Offset(), limit)
		c.ResponseOk(users, paginator.Nums())
	}
}

// GetUser
// @Title GetUser
// @Description get user
// @Param   id     query    string  true        "The id of the user"
// @Success 200 {object} object.User The Response object
// @router /get-user [get]
func (c *ApiController) GetUser() {
	id := c.Input().Get("id")

	c.Data["json"] = object.GetMaskedUser(object.GetUser(id))
	c.ServeJSON()
}

// UpdateUser
// @Title UpdateUser
// @Description update user
// @Param   id     query    string  true        "The id of the user"
// @Param   body    body   object.User  true        "The details of the user"
// @Success 200 {object} controllers.Response The Response object
// @router /update-user [post]
func (c *ApiController) UpdateUser() {
	id := c.Input().Get("id")

	var user object.User
	err := json.Unmarshal(c.Ctx.Input.RequestBody, &user)
	if err != nil {
		panic(err)
	}

	if user.DisplayName == "" {
		c.ResponseError("Display name cannot be empty")
		return
	}

	affected := object.UpdateUser(id, &user)
	if affected {
		newUser := object.GetUser(user.GetId())
		original.UpdateUserToOriginalDatabase(newUser)
	}

	c.Data["json"] = wrapActionResponse(affected)
	c.ServeJSON()
}

// AddUser
// @Title AddUser
// @Description add user
// @Param   body    body   object.User  true        "The details of the user"
// @Success 200 {object} controllers.Response The Response object
// @router /add-user [post]
func (c *ApiController) AddUser() {
	var user object.User
	err := json.Unmarshal(c.Ctx.Input.RequestBody, &user)
	if err != nil {
		panic(err)
	}

	c.Data["json"] = wrapActionResponse(object.AddUser(&user))
	c.ServeJSON()
}

// DeleteUser
// @Title DeleteUser
// @Description delete user
// @Param   body    body   object.User  true        "The details of the user"
// @Success 200 {object} controllers.Response The Response object
// @router /delete-user [post]
func (c *ApiController) DeleteUser() {
	var user object.User
	err := json.Unmarshal(c.Ctx.Input.RequestBody, &user)
	if err != nil {
		panic(err)
	}

	c.Data["json"] = wrapActionResponse(object.DeleteUser(&user))
	c.ServeJSON()
}

// GetEmailAndPhone
// @Title GetEmailAndPhone
// @Description get email and phone by username
// @Param   username    formData   string  true        "The username of the user"
// @Param   organization    formData   string  true        "The organization of the user"
// @Success 200 {object} controllers.Response The Response object
// @router /get-email-and-phone [post]
func (c *ApiController) GetEmailAndPhone() {
	var form RequestForm
	err := json.Unmarshal(c.Ctx.Input.RequestBody, &form)
	if err != nil {
		panic(err)
	}

	user := object.GetUserByFields(form.Organization, form.Username)
	if user == nil {
		c.ResponseError("No such user.")
		return
	}

	respUser := object.User{Email: user.Email, Phone: user.Phone, Name: user.Name}
	var contentType string
	switch form.Username {
	case user.Email:
		contentType = "email"
	case user.Phone:
		contentType = "phone"
	case user.Name:
		contentType = "username"
	}

	c.ResponseOk(respUser, contentType)
}

// SetPassword
// @Title SetPassword
// @Description set password
// @Param   userOwner   formData    string  true        "The owner of the user"
// @Param   userName   formData    string  true        "The name of the user"
// @Param   oldPassword   formData    string  true        "The old password of the user"
// @Param   newPassword   formData    string  true        "The new password of the user"
// @Success 200 {object} controllers.Response The Response object
// @router /set-password [post]
func (c *ApiController) SetPassword() {
	userOwner := c.Ctx.Request.Form.Get("userOwner")
	userName := c.Ctx.Request.Form.Get("userName")
	oldPassword := c.Ctx.Request.Form.Get("oldPassword")
	newPassword := c.Ctx.Request.Form.Get("newPassword")

	requestUserId := c.GetSessionUsername()
	if requestUserId == "" {
		c.ResponseError("Please login first.")
		return
	}
	requestUser := object.GetUser(requestUserId)
	if requestUser == nil {
		c.ResponseError("Session outdated. Please login again.")
		return
	}

	userId := fmt.Sprintf("%s/%s", userOwner, userName)
	targetUser := object.GetUser(userId)
	if targetUser == nil {
		c.ResponseError("Invalid user id.")
		return
	}

	hasPermission := false

	if requestUser.IsGlobalAdmin {
		hasPermission = true
	} else if requestUserId == userId {
		hasPermission = true
	} else if targetUser.Owner == requestUser.Owner && requestUser.IsAdmin {
		hasPermission = true
	}

	if !hasPermission {
		c.ResponseError("You don't have the permission to do this.")
		return
	}

	if oldPassword != "" {
		msg := object.CheckPassword(targetUser, oldPassword)
		if msg != "" {
			c.ResponseError(msg)
			return
		}
	}

	if strings.Contains(newPassword, " ") {
		c.ResponseError("New password cannot contain blank space.")
		return
	}

	if len(newPassword) <= 5 {
		c.ResponseError("New password must have at least 6 characters")
		return
	}

	c.SetSessionUsername("")

	targetUser.Password = newPassword
	object.SetUserField(targetUser, "password", targetUser.Password)
	c.Data["json"] = Response{Status: "ok"}
	c.ServeJSON()
}

func (c *ApiController) CheckUserPassword() {
	var user object.User
	err := json.Unmarshal(c.Ctx.Input.RequestBody, &user)
	if err != nil {
		panic(err)
	}

	_, msg := object.CheckUserPassword(user.Owner, user.Name, user.Password)
	if msg == "" {
		c.ResponseOk()
	} else {
		c.ResponseError(msg)
	}
}