package db

import (
	"context"
	"git.user-penguin.space/vladimir/all-tg-bot/config"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"time"
)

type chatDTO struct {
	ChatID int64    `bson:"chat_id"`
	Users  []string `bson:"users"`
}

var cfg *config.Config

func init() {
	cfg = config.NewConfig()
}

func AddChat(chatID int64) error {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)

	result := collection.FindOne(ctx, bson.M{"chat_id": chatID})
	if result.Err() == mongo.ErrNoDocuments {
		if _, err := collection.InsertOne(ctx, &chatDTO{ChatID: chatID}); err != nil {
			return err
		}
		return nil
	}
	return result.Err()
}

func AddUserInChat(chatID int64, username string) error {
	if username == "" {
		return nil
	}

	if err := AddChat(chatID); err != nil {
		return err
	}

	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)
	_, err = collection.UpdateOne(
		ctx,
		bson.M{"chat_id": chatID},
		bson.M{"$addToSet": bson.M{"users": username}},
	)
	return err
}

func GetUsers(chatID int64) ([]string, error) {
	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	client, err := mongo.Connect(ctx, options.Client().ApplyURI(cfg.MongoURL))
	if err != nil {
		return nil, err
	}

	collection := client.Database(cfg.DBName).Collection(cfg.ChatsCollectionName)
	chatDTO := &chatDTO{}
	if err := collection.FindOne(ctx, bson.M{"chat_id": chatID}).Decode(chatDTO); err != nil {
		return nil, err
	}
	return chatDTO.Users, err
}