package radio

import (
	"errors"
	"sundynix-go/global"
	"sundynix-go/model/radio"
	radioReq "sundynix-go/model/radio/request"

	"gorm.io/gorm"
)

type InteractionService struct{}

// AddHistory 添加收听历史
func (s *InteractionService) AddHistory(userId string, req radioReq.AddHistory) error {
	// 先查找是否已存在记录
	var history radio.RadioHistory
	err := global.DB.Where("user_id = ? AND program_id = ?", userId, req.ProgramId).First(&history).Error

	if errors.Is(err, gorm.ErrRecordNotFound) {
		// 不存在，创建新记录
		history = radio.RadioHistory{
			UserId:    userId,
			ProgramId: req.ProgramId,
			Progress:  req.Progress,
			Duration:  req.Duration,
		}
		return global.DB.Create(&history).Error
	}

	if err != nil {
		return err
	}

	// 存在，更新进度
	return global.DB.Model(&history).Updates(map[string]interface{}{
		"progress": req.Progress,
		"duration": req.Duration,
	}).Error
}

// GetHistoryList 获取收听历史列表
func (s *InteractionService) GetHistoryList(userId string, info radioReq.GetHistoryList) ([]radio.RadioHistory, int64, error) {
	db := global.DB.Model(&radio.RadioHistory{}).Where("user_id = ?", userId).Preload("RadioProgram")
	var list []radio.RadioHistory
	var total int64

	err := db.Count(&total).Error
	if err != nil {
		return nil, 0, err
	}

	offset := (info.Current - 1) * info.PageSize
	err = db.Offset(offset).Limit(info.PageSize).Order("created_at DESC").Find(&list).Error
	return list, total, err
}

// ToggleLike 切换点赞状态
func (s *InteractionService) ToggleLike(userId, programId string) (bool, error) {
	var like radio.RadioLike
	err := global.DB.Where("user_id = ? AND program_id = ?", userId, programId).First(&like).Error

	if errors.Is(err, gorm.ErrRecordNotFound) {
		// 未点赞，添加点赞
		like = radio.RadioLike{
			UserId:    userId,
			ProgramId: programId,
		}
		if err := global.DB.Create(&like).Error; err != nil {
			return false, err
		}
		// 增加节目点赞数
		global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).
			UpdateColumn("like_count", gorm.Expr("like_count + ?", 1))
		return true, nil
	}

	if err != nil {
		return false, err
	}

	// 已点赞，取消点赞
	if err := global.DB.Delete(&like).Error; err != nil {
		return false, err
	}
	// 减少节目点赞数
	global.DB.Model(&radio.RadioProgram{}).Where("id = ?", programId).
		UpdateColumn("like_count", gorm.Expr("like_count - ?", 1))
	return false, nil
}

// IsLiked 检查是否已点赞
func (s *InteractionService) IsLiked(userId, programId string) (bool, error) {
	var count int64
	err := global.DB.Model(&radio.RadioLike{}).Where("user_id = ? AND program_id = ?", userId, programId).Count(&count).Error
	return count > 0, err
}

// AddFavorite 添加收藏
func (s *InteractionService) AddFavorite(userId, programId string) error {
	// 检查是否已收藏
	var existing radio.RadioFavorite
	err := global.DB.Where("user_id = ? AND program_id = ?", userId, programId).First(&existing).Error
	if err == nil {
		return errors.New("已经收藏过该节目")
	}
	if !errors.Is(err, gorm.ErrRecordNotFound) {
		return err
	}

	favorite := radio.RadioFavorite{
		UserId:    userId,
		ProgramId: programId,
	}
	return global.DB.Create(&favorite).Error
}

// RemoveFavorite 取消收藏
func (s *InteractionService) RemoveFavorite(userId, programId string) error {
	return global.DB.Where("user_id = ? AND program_id = ?", userId, programId).Delete(&radio.RadioFavorite{}).Error
}

// GetFavoriteList 获取收藏列表
func (s *InteractionService) GetFavoriteList(userId string, info radioReq.GetFavoriteList) ([]radio.RadioFavorite, int64, error) {
	db := global.DB.Model(&radio.RadioFavorite{}).Where("user_id = ?", userId)
	var list []radio.RadioFavorite
	var total int64

	err := db.Count(&total).Error
	if err != nil {
		return nil, 0, err
	}

	offset := (info.Current - 1) * info.PageSize
	err = db.Offset(offset).Limit(info.PageSize).Order("created_at DESC").Find(&list).Error
	return list, total, err
}

// IsFavorited 检查是否已收藏
func (s *InteractionService) IsFavorited(userId, programId string) (bool, error) {
	var count int64
	err := global.DB.Model(&radio.RadioFavorite{}).Where("user_id = ? AND program_id = ?", userId, programId).Count(&count).Error
	return count > 0, err
}

// AddComment 添加评论
func (s *InteractionService) AddComment(userId string, req radioReq.AddComment) error {
	comment := radio.RadioComment{
		ProgramId: req.ProgramId,
		UserId:    userId,
		ParentId:  req.ParentId,
		Content:   req.Content,
	}
	return global.DB.Create(&comment).Error
}

// DeleteComment 删除评论
func (s *InteractionService) DeleteComment(userId, commentId string) error {
	return global.DB.Where("id = ? AND user_id = ?", commentId, userId).Delete(&radio.RadioComment{}).Error
}

// GetCommentList 获取评论列表
func (s *InteractionService) GetCommentList(programId string, info radioReq.GetCommentList) ([]radio.RadioComment, int64, error) {
	db := global.DB.Model(&radio.RadioComment{}).Where("program_id = ?", programId)
	var list []radio.RadioComment
	var total int64

	err := db.Count(&total).Error
	if err != nil {
		return nil, 0, err
	}

	offset := (info.Current - 1) * info.PageSize
	err = db.Offset(offset).Limit(info.PageSize).Order("created_at DESC").Find(&list).Error
	return list, total, err
}