package service

import (
	"Blog/internal/client"
	"Blog/internal/consts"
	"Blog/internal/model"
	"Blog/internal/repository"
	"context"
	"errors"
	"strconv"
	"time"

	"github.com/google/uuid"
	"github.com/redis/go-redis/v9"
	"github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

var ArticleService *articleService = newArticleService()

type articleService struct {
}

func initArticleData() {
	var slices []model.BlogArticle = repository.ArticleRepository.FindList(nil, "state = ?", consts.ARTICLE_STATE_PUBLISH)
	logrus.Info("文章初始化数据加载量:", len(slices))
	ctx := context.Background()
	for _, article := range slices {
		// logrus.Info(article)
		publishTime := article.PublishTime
		err := client.RedisClient.ZAdd(ctx, consts.REDIS_BLOG_ARTICLE_LATEST, redis.Z{Score: float64(publishTime), Member: &article}).Err()
		if err != nil {
			logrus.Info(err)
		}
	}
}

func newArticleService() *articleService {
	go initArticleData()

	return &articleService{}
}

// 根据ID获取文章
func (*articleService) GetArticle(id string) *model.BlogArticle {
	var ret *model.BlogArticle = &model.BlogArticle{}
	key := consts.REDIS_BLOG_ARTICLE + id
	err := client.RedisClient.Get(context.Background(), key).Scan(ret)
	if err != nil {
		logrus.Infoln(id, "文章的缓存不存在，读取数据库")
		ret = repository.ArticleRepository.GetById(id)
		client.RedisClient.Set(context.Background(), key, ret, time.Duration(0))
	}
	return ret
}

func (*articleService) GetLatest() []model.BlogArticle {
	ctx := context.Background()
	var slices []model.BlogArticle

	err := client.RedisClient.ZRevRange(ctx, consts.REDIS_BLOG_ARTICLE_LATEST, 0, 10).ScanSlice(&slices)
	// if err != nil || len(slices) == 0 {
	// 	result := repository.ArticleRepository.Where("state = ?", consts.ARTICLE_STATE_PUBLISH).Order("publish_time DESC").Find(&slices)
	// 	logrus.Info("文章初始化数据加载量:", result.RowsAffected)
	// 	ctx := context.Background()
	// 	client.RedisClient.Del(ctx, consts.REDIS_BLOG_ARTICLE_LATEST)
	// 	for _, article := range slices {
	// 		// logrus.Info(article)
	// 		publishTime := article.PublishTime
	// 		err := client.RedisClient.ZAdd(ctx, consts.REDIS_BLOG_ARTICLE_LATEST, redis.Z{Score: float64(publishTime), Member: &article}).Err()
	// 		if err != nil {
	// 			logrus.Info(err)
	// 		}
	// 	}
	// }

	if err != nil {
		logrus.Error("获取文章失败:", err)
		return nil
	}
	return slices
}

// 文章分页
func (*articleService) PageArticle(page int, itemsPerPage int) model.Page[any] {
	var slice []model.BlogArticle
	var totalElements int64
	ctx := context.Background()
	repository.ArticleRepository.Table(consts.TABLE_BLOG_ARTICLE).Count(&totalElements)
	repository.ArticleRepository.Table(consts.TABLE_BLOG_ARTICLE).
		Where("del != ?", 1).
		Offset((page - 1) * itemsPerPage).
		Limit(itemsPerPage).
		Order("create_time DESC").
		Find(&slice)

	ret := []any{}

	for _, v := range slice {
		id := v.Id
		view, _ := client.RedisClient.HGet(ctx, consts.REDIS_BLOG_VIEW_RECORD, id).Int64()
		// content[i].View = view
		var vo = struct {
			model.BlogArticle
			View int64 `json:"view"`
		}{v, view}

		ret = append(ret, vo)
	}

	pre := int(totalElements) % itemsPerPage
	if pre > 0 {
		pre = 1
	}
	var totalPages int = int(totalElements)/itemsPerPage + pre

	return model.Page[any]{TotalElements: totalElements, TotalPages: totalPages, Number: page, Content: ret}
}

// 创建文章
func (*articleService) CreateArticle(articel *model.BlogArticle) (string, error) {
	time := time.Now().UnixMilli()
	articleId := uuid.NewString()
	articel.Id = articleId
	articel.CreateTime = time
	articel.UpdateTime = time
	articel.Del = 0
	articel.State = consts.ARTICLE_STATE_DRAFT

	err := repository.ArticleRepository.WGorm(func(tx *gorm.DB) error {
		contentId := uuid.NewString()
		content := articel.Content
		commonContent := model.BlogTextContent{Id: contentId, RelId: articleId, Content: content, State: consts.CONTENT_STATE_DOWN}
		err := tx.Table(consts.TABLE_BLOG_TEXT_CONTENT).Create(commonContent).Error
		if err != nil {
			return err
		}
		articel.Content = ""
		err = tx.Table(consts.TABLE_BLOG_ARTICLE).Create(*articel).Error
		return err
	})

	return articleId, err
}

// 修改文章
func (*articleService) UpdateArticle(articel *model.BlogArticle) (string, error) {
	time := time.Now().UnixMilli()
	articleId := articel.Id
	articel.UpdateTime = time
	err := repository.ArticleRepository.WGorm(func(tx *gorm.DB) error {
		//更新Article
		tx.Table(consts.TABLE_BLOG_ARTICLE).Updates(articel)

		//更新Content
		err := tx.Table(consts.TABLE_BLOG_TEXT_CONTENT).Where("rel_id", articleId).UpdateColumn("content", articel.Content).Error
		return err
	})

	return articleId, err
}

// 发布文章
func (*articleService) PublishArticle(id string) error {
	now := time.Now().UnixMilli()

	// var article model.BlogArticle
	// err := repository.ArticleRepository.Table(consts.TABLE_BLOG_ARTICLE).Where("id = ?", id).First(&article).Error
	article := repository.ArticleRepository.GetById(id)
	if article == nil {
		return errors.New("不存在该文章")
	}

	if article.State != consts.ARTICLE_STATE_DRAFT {
		return errors.New("发布失败,文章状态不是起草状态,无法发布")
	}

	if article.PublishTime == 0 {
		article.PublishTime = now
	}
	article.State = consts.ARTICLE_STATE_PUBLISH

	err := repository.ArticleRepository.WGorm(func(tx *gorm.DB) error {
		var txErr error = tx.Table(consts.TABLE_BLOG_ARTICLE).Updates(&article).Error
		if txErr != nil {
			return errors.New("文章更新错误")
		}
		// txErr = ContentService.UpdataState(id, consts.CONTENT_STATE_PUBLISH)
		txErr = tx.Table(consts.TABLE_BLOG_TEXT_CONTENT).Where("rel_id = ?", id).UpdateColumn("state", consts.CONTENT_STATE_PUBLISH).Error
		if txErr != nil {
			return errors.New("文本状态更新错误")
		}
		content := TextContentService.GetContent(id)
		if txErr != nil {
			return errors.New("文本查询错误")
		}

		ctx := context.Background()
		txErr = client.RedisClient.ZAdd(ctx, consts.REDIS_BLOG_ARTICLE_LATEST, redis.Z{Score: float64(article.PublishTime), Member: &article}).Err()
		if txErr != nil {
			return errors.New("缓存错误")
		}
		txErr = client.RedisClient.Set(ctx, consts.REDIS_BLOG_CONTENT+id, content.Content, time.Duration(0)).Err()

		return txErr
	})

	return err
}

// 撤回发布文章
func (*articleService) UnPublishArticle(id string) error {
	// var article model.BlogArticle
	// err := repository.ArticleRepository.Table(consts.TABLE_BLOG_ARTICLE).Where("id = ?", id).First(&article).Error
	article := repository.ArticleRepository.GetById(id)
	if article == nil {
		return errors.New("不存在该文章")
	}

	if article.State != consts.CONTENT_STATE_PUBLISH {
		return errors.New("撤下失败,文章状态不是已发布状态,无法撤下")
	}

	err := repository.ArticleRepository.WGorm(func(tx *gorm.DB) error {
		var txErr error
		ctx := context.Background()
		txErr = client.RedisClient.ZRemRangeByScore(ctx, consts.REDIS_BLOG_ARTICLE_LATEST,
			strconv.FormatFloat(float64(article.PublishTime), 'E', -1, 64),
			strconv.FormatFloat(float64(article.PublishTime), 'E', -1, 64),
		).Err()
		// txErr = client.RedisClient.ZAdd(ctx, "blog:article:latest", redis.Z{Score: float64(article.PublishTime), Member: &article}).Err()
		if txErr != nil {
			return errors.New("缓存错误")
		}

		txErr = client.RedisClient.Del(ctx, consts.REDIS_BLOG_CONTENT+id).Err()
		if txErr != nil {
			return errors.New("缓存错误")
		}

		article.State = consts.ARTICLE_STATE_DRAFT
		// article.PublishTime = -1
		txErr = tx.Table(consts.TABLE_BLOG_ARTICLE).Updates(&article).Error
		if txErr != nil {
			return errors.New("文章状态更新错误")
		}
		// txErr = ContentService.UpdataState(id, consts.CONTENT_STATE_DOWN)
		txErr = tx.Table(consts.TABLE_BLOG_TEXT_CONTENT).Where("rel_id = ?", id).UpdateColumn("state", consts.CONTENT_STATE_DOWN).Error

		return txErr
	})

	return err
}

// 删除文章
func (*articleService) DelArticle(id string) error {
	// articel := ArticleService.GetAdminArticle(id)
	// err := repository.ArticleRepository.Table(consts.TABLE_BLOG_ARTICLE).Where("id = ?", id).First(&article).Error
	err := repository.ArticleRepository.WGorm(func(tx *gorm.DB) error {
		txErr := tx.Table(consts.TABLE_BLOG_ARTICLE).Where("id = ?", id).UpdateColumn("del", 1).Error
		return txErr
	})

	return err
}