package comment_api

import (
	"encoding/base64"
	"errors"
	"github.com/acmestack/gorm-plus/gplus"
	"io"
	"regexp"
	"schisandra-cloud-album/api/comment_api/dto"
	"schisandra-cloud-album/global"
	"schisandra-cloud-album/model"
	"schisandra-cloud-album/service"
	"strings"
	"sync"
	"time"
)

type CommentAPI struct{}

var wg sync.WaitGroup
var mx sync.Mutex
var commentReplyService = service.Service.CommentReplyService

// CommentImages 评论图片
type CommentImages struct {
	TopicId   string   `json:"topic_id" bson:"topic_id" required:"true"`
	CommentId int64    `json:"comment_id" bson:"comment_id" required:"true"`
	UserId    string   `json:"user_id" bson:"user_id" required:"true"`
	Images    [][]byte `json:"images" bson:"images" required:"true"`
	CreatedAt string   `json:"created_at" bson:"created_at" required:"true"`
}

// CommentContent 评论内容
type CommentContent struct {
	NickName        string    `json:"nickname"`
	Avatar          string    `json:"avatar"`
	Level           int       `json:"level,omitempty"`
	Id              int64     `json:"id"`
	UserId          string    `json:"user_id"`
	TopicId         string    `json:"topic_id"`
	Content         string    `json:"content"`
	ReplyTo         int64     `json:"reply_to,omitempty"`
	ReplyId         int64     `json:"reply_id,omitempty"`
	ReplyUser       string    `json:"reply_user,omitempty"`
	ReplyUsername   string    `json:"reply_username,omitempty"`
	Author          int       `json:"author"`
	Likes           int64     `json:"likes"`
	ReplyCount      int64     `json:"reply_count"`
	CreatedTime     time.Time `json:"created_time"`
	Location        string    `json:"location"`
	Browser         string    `json:"browser"`
	OperatingSystem string    `json:"operating_system"`
	IsLiked         bool      `json:"is_liked" default:"false"`
	Images          []string  `json:"images,omitempty"`
}

// CommentResponse 评论返回值
type CommentResponse struct {
	Size     int              `json:"size"`
	Total    int64            `json:"total"`
	Current  int              `json:"current"`
	Comments []CommentContent `json:"comments"`
}

// base64ToBytes 将base64字符串转换为字节数组
func base64ToBytes(base64Str string) ([]byte, error) {
	reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(base64Str))
	data, err := io.ReadAll(reader)
	if err != nil {
		return nil, errors.New("failed to decode base64 string")
	}
	return data, nil
}

// processImages 处理图片，将 base64 字符串转换为字节数组
func processImages(images []string) ([][]byte, error) {
	var imagesData [][]byte
	dataChan := make(chan []byte, len(images)) // 创建一个带缓冲的 channel
	re := regexp.MustCompile(`^data:image/\w+;base64,`)

	for _, img := range images {
		wg.Add(1) // 增加 WaitGroup 的计数
		go func(img string) {
			defer wg.Done() // 函数结束时减少计数

			imgWithoutPrefix := re.ReplaceAllString(img, "")
			data, err := base64ToBytes(imgWithoutPrefix)
			if err != nil {
				return // 出错时直接返回
			}
			dataChan <- data // 将结果发送到 channel
		}(img)
	}

	wg.Wait()       // 等待所有 goroutine 完成
	close(dataChan) // 关闭 channel

	for data := range dataChan { // 收集所有结果
		imagesData = append(imagesData, data)
	}

	return imagesData, nil
}

// getMimeType 获取 MIME 类型
func getMimeType(data []byte) string {
	if len(data) < 4 {
		return "application/octet-stream" // 默认类型
	}

	// 判断 JPEG
	if data[0] == 0xFF && data[1] == 0xD8 {
		return "image/jpeg"
	}

	// 判断 PNG
	if len(data) >= 8 && data[0] == 0x89 && data[1] == 0x50 && data[2] == 0x4E && data[3] == 0x47 &&
		data[4] == 0x0D && data[5] == 0x0A && data[6] == 0x1A && data[7] == 0x0A {
		return "image/png"
	}

	// 判断 GIF
	if len(data) >= 6 && data[0] == 'G' && data[1] == 'I' && data[2] == 'F' {
		return "image/gif"
	}
	// 判断 WEBP
	if len(data) >= 12 && data[0] == 0x52 && data[1] == 0x49 && data[2] == 0x46 && data[3] == 0x46 &&
		data[8] == 0x57 && data[9] == 0x45 && data[10] == 0x42 && data[11] == 0x50 {
		return "image/webp"
	}
	// 判断svg
	if len(data) >= 4 && data[0] == '<' && data[1] == '?' && data[2] == 'x' && data[3] == 'm' {
		return "image/svg+xml"
	}
	// 判断JPG
	if len(data) >= 3 && data[0] == 0xFF && data[1] == 0xD8 && data[2] == 0xFF {
		return "image/jpeg"
	}

	return "application/octet-stream" // 默认类型
}

// 点赞
var likeChannel = make(chan dto.CommentLikeRequest, 100)
var cancelLikeChannel = make(chan dto.CommentLikeRequest, 100) // 取消点赞

func init() {
	go likeConsumer()       // 启动消费者
	go cancelLikeConsumer() // 启动消费者
}
func likeConsumer() {
	for likeRequest := range likeChannel {
		processLike(likeRequest) // 处理点赞
	}
}
func cancelLikeConsumer() {
	for cancelLikeRequest := range cancelLikeChannel {
		processCancelLike(cancelLikeRequest) // 处理取消点赞
	}
}

func processLike(likeRequest dto.CommentLikeRequest) {
	mx.Lock()
	defer mx.Unlock()

	likes := model.ScaCommentLikes{
		CommentId: likeRequest.CommentId,
		UserId:    likeRequest.UserID,
		TopicId:   likeRequest.TopicId,
	}

	tx := global.DB.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	res := global.DB.Create(&likes) // 假设这是插入数据库的方法
	if res.Error != nil {
		tx.Rollback()
		global.LOG.Errorln(res.Error)
		return
	}

	// 异步更新点赞计数
	go func() {
		if err := commentReplyService.UpdateCommentLikesCount(likeRequest.CommentId, likeRequest.TopicId); err != nil {
			global.LOG.Errorln(err)
		}
	}()

	tx.Commit()
}
func processCancelLike(cancelLikeRequest dto.CommentLikeRequest) {
	mx.Lock()
	defer mx.Unlock()

	tx := global.DB.Begin()
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	query, u := gplus.NewQuery[model.ScaCommentLikes]()
	query.Eq(&u.CommentId, cancelLikeRequest.CommentId).
		Eq(&u.UserId, cancelLikeRequest.UserID).
		Eq(&u.TopicId, cancelLikeRequest.TopicId)

	res := gplus.Delete[model.ScaCommentLikes](query)
	if res.Error != nil {
		tx.Rollback()
		return // 返回错误而非打印
	}

	// 异步更新点赞计数
	go func() {
		if err := commentReplyService.DecrementCommentLikesCount(cancelLikeRequest.CommentId, cancelLikeRequest.TopicId); err != nil {
			global.LOG.Errorln(err)
		}
	}()

	tx.Commit()
	return
}