// 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 (
	"context"
	"encoding/json"
	"fmt"

	"github.com/astaxie/beego"
	"github.com/casdoor/casdoor/idp"
	"github.com/casdoor/casdoor/object"
	"github.com/casdoor/casdoor/util"
	"golang.org/x/oauth2"
)

func (c *ApiController) HandleLoggedIn(userId string) {
	c.SetSessionUser(userId)
	util.LogInfo(c.Ctx, "API: [%s] signed in", userId)
}

func (c *ApiController) AuthLogin() {
	var form RegisterForm
	err := json.Unmarshal(c.Ctx.Input.RequestBody, &form)
	if err != nil {
		panic(err)
	}

	application := object.GetApplication(fmt.Sprintf("admin/%s", form.Application))
	provider := object.GetProvider(fmt.Sprintf("admin/%s", form.Provider))

	idProvider := idp.GetIdProvider(provider.Type)
	oauthConfig := idProvider.GetConfig()
	oauthConfig.ClientID = provider.ClientId
	oauthConfig.ClientSecret = provider.ClientSecret
	oauthConfig.RedirectURL = form.RedirectUri

	var resp Response
	var res authResponse

	if form.State != beego.AppConfig.String("AuthState") {
		resp = Response{Status: "error", Msg: "unauthorized", Data: res}
		c.ServeJSON()
		return
	}

	// https://github.com/golang/oauth2/issues/123#issuecomment-103715338
	ctx := context.WithValue(oauth2.NoContext, oauth2.HTTPClient, httpClient)
	token, err := oauthConfig.Exchange(ctx, form.Code)
	if err != nil {
		panic(err)
	}

	if !token.Valid() {
		resp = Response{Status: "error", Msg: "unauthorized", Data: res}
		c.Data["json"] = resp
		c.ServeJSON()
		return
	}

	res.Email, res.Method, res.Avatar, err = idProvider.GetUserInfo(httpClient, token)
	if err != nil {
		resp = Response{Status: "error", Msg: "Login failed, please try again."}
		c.Data["json"] = resp
		c.ServeJSON()
		return
	}

	if form.Method == "signup" {
		userId := ""
		if provider.Type == "github" {
			userId = object.GetUserIdByField(application, "github", res.Method)
		} else if provider.Type == "google" {
			userId = object.GetUserIdByField(application, "google", res.Email)
		}

		if userId != "" {
			//if object.IsForbidden(userId) {
			//	c.forbiddenAccountResp(userId)
			//	return
			//}

			//if len(object.GetMemberAvatar(userId)) == 0 {
			//	avatar := UploadAvatarToOSS(res.Avatar, userId)
			//	object.LinkMemberAccount(userId, "avatar", avatar)
			//}

			c.HandleLoggedIn(userId)
		} else {
			//if object.IsForbidden(userId) {
			//	c.forbiddenAccountResp(userId)
			//	return
			//}

			if userId := object.GetUserIdByField(application, "email", res.Email); userId != "" {
				c.HandleLoggedIn(userId)

				if provider.Type == "github" {
					_ = object.LinkUserAccount(userId, "github", res.Method)
				} else if provider.Type == "google" {
					_ = object.LinkUserAccount(userId, "google", res.Email)
				}
			}
		}
		//res.Method = res.Email
		resp = Response{Status: "ok", Msg: "success", Data: res}
	} else {
		userId := c.GetSessionUser()
		if userId == "" {
			resp = Response{Status: "error", Msg: "user doesn't exist", Data: res}
			c.Data["json"] = resp
			c.ServeJSON()
			return
		}

		var linkRes bool
		if provider.Type == "github" {
			_ = object.LinkUserAccount(userId, "github", res.Method)
		} else if provider.Type == "google" {
			_ = object.LinkUserAccount(userId, "google", res.Email)
		}
		if linkRes {
			resp = Response{Status: "ok", Msg: "success", Data: linkRes}
		} else {
			resp = Response{Status: "error", Msg: "link account failed", Data: linkRes}
		}
		//if len(object.GetMemberAvatar(userId)) == 0 {
		//	avatar := UploadAvatarToOSS(tempUserAccount.AvatarUrl, userId)
		//	object.LinkUserAccount(userId, "avatar", avatar)
		//}
	}

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