package mongo

import (
	"context"
	"fwh-toolbox-server/database"
	"fwh-toolbox-server/domain"
	"time"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo/options"
)

const CollectionName_AiChatSession = "AiChatSessions"

// UpsertAiChatSession 创建或更新会话记录
func UpsertAiChatSession(sess domain.AiChatSession) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	collection := database.GetCollection(CollectionName_AiChatSession)

	filter := bson.M{
		"userId":    sess.UserId,
		"sessionId": sess.SessionId,
	}
	update := bson.M{
		"$set": bson.M{
			"title":      sess.Title,
			"isActive":   sess.IsActive,
			"lastActive": sess.LastActive,
			"updatedAt":  time.Now(),
		},
		"$setOnInsert": bson.M{
			"userId":    sess.UserId,
			"sessionId": sess.SessionId,
			"createdAt": sess.CreatedAt,
		},
	}

	opts := options.Update().SetUpsert(true)
	_, err := collection.UpdateOne(ctx, filter, update, opts)
	return err
}

// GetAiChatSessionsByUser 获取用户的所有会话（按 lastActive 倒序）
func GetAiChatSessionsByUser(userId string) ([]domain.AiChatSession, error) {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	collection := database.GetCollection(CollectionName_AiChatSession)

	filter := bson.M{"userId": userId}
	findOpts := options.Find().
		SetSort(bson.D{{Key: "lastActive", Value: -1}}).
		SetLimit(50)

	cursor, err := collection.Find(ctx, filter, findOpts)
	if err != nil {
		return nil, err
	}
	defer cursor.Close(ctx)

	var sessions []domain.AiChatSession
	if err := cursor.All(ctx, &sessions); err != nil {
		return nil, err
	}
	return sessions, nil
}

// UpdateAiChatSessionTitle 更新会话标题
func UpdateAiChatSessionTitle(userId string, sessionId string, title string) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	collection := database.GetCollection(CollectionName_AiChatSession)

	filter := bson.M{"userId": userId, "sessionId": sessionId}
	update := bson.M{
		"$set": bson.M{
			"title":     title,
			"updatedAt": time.Now(),
		},
	}

	_, err := collection.UpdateOne(ctx, filter, update)
	return err
}

// UpdateAiChatSessionActive 更新会话的活跃状态
func UpdateAiChatSessionActive(userId string, sessionId string, isActive bool) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	collection := database.GetCollection(CollectionName_AiChatSession)

	filter := bson.M{"userId": userId, "sessionId": sessionId}
	update := bson.M{
		"$set": bson.M{
			"isActive":   isActive,
			"lastActive": time.Now(),
			"updatedAt":  time.Now(),
		},
	}

	_, err := collection.UpdateOne(ctx, filter, update)
	return err
}

// DeactivateAllAiChatSessions 将用户所有会话设为非活跃
func DeactivateAllAiChatSessions(userId string) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	collection := database.GetCollection(CollectionName_AiChatSession)

	filter := bson.M{"userId": userId, "isActive": true}
	update := bson.M{
		"$set": bson.M{
			"isActive":  false,
			"updatedAt": time.Now(),
		},
	}

	_, err := collection.UpdateMany(ctx, filter, update)
	return err
}

// DeleteAiChatSession 删除会话记录
func DeleteAiChatSession(userId string, sessionId string) error {
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	collection := database.GetCollection(CollectionName_AiChatSession)

	filter := bson.M{"userId": userId, "sessionId": sessionId}
	_, err := collection.DeleteOne(ctx, filter)
	return err
}