package model

import (
	"app-cloudep-tweeting-service/internal/domain"
	"context"
	"errors"
	"github.com/zeromicro/go-zero/core/stores/mon"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"time"
)

var _ Post_likesModel = (*customPost_likesModel)(nil)

type (
	// Post_likesModel is an interface to be customized, add more methods here,
	// and implement the added methods in customPost_likesModel.
	Post_likesModel interface {
		post_likesModel
		LikeDislike(ctx context.Context, postLike *PostLikes) error
		FindLikeUsers(ctx context.Context, param *QueryPostLikeReq) ([]*PostLikes, int64, error)
		FindUIDPostLikeStatus(ctx context.Context, param *QueryUIDPostLikeStatusReq) ([]UIDPostLikeStatusResp, error)
	}

	QueryPostLikeReq struct {
		Target    string          `bson:"target"`
		LikeType  domain.LikeType `bson:"like_type"`
		PageIndex int64           `bson:"page_index"`
		PageSize  int64           `bson:"page_size"`
	}

	QueryUIDPostLikeStatusReq struct {
		Targets  []string        `bson:"target"`
		LikeType domain.LikeType `bson:"like_type"`
		UID      string
	}

	UIDPostLikeStatusResp struct {
		TargetID   string `json:"target_id"`
		LikeStatus bool   `json:"like_status"`
	}

	customPost_likesModel struct {
		*defaultPost_likesModel
	}
)

// NewPost_likesModel returns a model for the mongo.
func NewPost_likesModel(url, db, collection string) Post_likesModel {
	conn := mon.MustNewModel(url, db, collection)
	return &customPost_likesModel{
		defaultPost_likesModel: newDefaultPost_likesModel(conn),
	}
}

func (m *defaultPost_likesModel) LikeDislike(ctx context.Context, postLike *PostLikes) error {
	// 使用 target_id、uid、type 來查詢資料是否存在
	filter := bson.M{
		"target_id": postLike.TargetID,
		"uid":       postLike.UID,
		"type":      postLike.Type,
	}

	// 查詢資料是否存在
	var existingPostLike PostLikes
	err := m.conn.FindOne(ctx, &existingPostLike, filter)

	if err == nil {
		// 資料存在，進行刪除操作
		_, err = m.conn.DeleteOne(ctx, filter)
		if err != nil {
			return err // 刪除失敗
		}
		return nil // 刪除成功
	} else if errors.Is(mongo.ErrNoDocuments, err) {
		// 資料不存在，進行插入操作
		postLike.ID = primitive.NewObjectID() // 設置新的 ObjectID
		postLike.CreateAt = time.Now().UTC().UnixNano()
		_, err = m.conn.InsertOne(ctx, postLike)
		if err != nil {
			return err // 插入失敗
		}
		return nil // 插入成功
	} else {
		// 其他錯誤
		return err
	}
}

func (m *defaultPost_likesModel) FindLikeUsers(ctx context.Context, param *QueryPostLikeReq) ([]*PostLikes, int64, error) {
	// 建立篩選條件
	filter := bson.M{}

	// 如果指定了 Target 條件，將其添加到篩選條件中
	if param.Target != "" {
		filter["target_id"] = param.Target
	}

	// 如果指定了 LikeType 條件，將其添加到篩選條件中
	if param.LikeType != 0 {
		filter["type"] = param.LikeType
	}

	// 計算符合條件的文檔總數
	totalCount, err := m.conn.CountDocuments(ctx, filter)
	if err != nil {
		return nil, 0, err
	}

	// 設置分頁和排序選項
	opts := options.Find()
	opts.SetSort(bson.D{{"createAt", -1}}) // 按照創建時間倒序排序
	if param.PageSize > 0 {
		opts.SetLimit(param.PageSize)
	}
	if param.PageIndex > 0 && param.PageSize > 0 {
		opts.SetSkip((param.PageIndex - 1) * param.PageSize)
	}

	// 查詢符合條件的文檔
	var results []*PostLikes
	err = m.conn.Find(ctx, &results, filter, opts)
	if err != nil {
		return nil, 0, err
	}

	// 返回結果集、總數和錯誤信息
	return results, totalCount, nil
}

func (m *defaultPost_likesModel) FindUIDPostLikeStatus(ctx context.Context, param *QueryUIDPostLikeStatusReq) ([]UIDPostLikeStatusResp, error) {
	// 初始化返回結果的切片
	var results []UIDPostLikeStatusResp

	// 建立篩選條件
	filter := bson.M{
		"uid":       param.UID,                    // 篩選指定的 UID
		"target_id": bson.M{"$in": param.Targets}, // 篩選多個目標 ID
		"type":      param.LikeType,               // 篩選指定的 LikeType
	}

	// 查詢符合條件的點讚記錄
	var postLikes []PostLikes
	err := m.conn.Find(ctx, &postLikes, filter)
	if err != nil {
		return nil, err
	}

	// 構建一個 map 來保存查詢到的點讚記錄
	targetLikeMap := make(map[string]bool)
	for _, like := range postLikes {
		targetLikeMap[like.TargetID] = true
	}

	// 構建每個目標的點讚狀態
	for _, targetID := range param.Targets {
		likeStatus := UIDPostLikeStatusResp{
			TargetID:   targetID,
			LikeStatus: targetLikeMap[targetID], // 如果 map 中有該 targetID，返回 true，否則返回 false
		}

		// 如果該 targetID 沒有點讚記錄，默認 LikeStatus 為 false
		if _, found := targetLikeMap[targetID]; !found {
			likeStatus.LikeStatus = false
		}

		results = append(results, likeStatus)
	}

	return results, nil
}