package user

import (
	"context"
	"time"

	"wish-list-api/api/presenter"
	"wish-list-api/pkg/entities"

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

type Repository interface {
	CreateUser(user *entities.User) (*entities.User, error)
	ReadUser(ID string) (*entities.User, error)
	ReadUserByEmail(email string) (*entities.User, error)
	ReadAllUsers() (*[]presenter.User, error)
	UpdateUser(user *entities.User) (*entities.User, error)
	DeleteUser(ID string) error

	ReadUserByTelegramID(telegramID int64) (*entities.User, error)
	UpdateUserTelegramData(user *entities.User) (*entities.User, error)
}

type repository struct {
	Collection *mongo.Collection
}

func NewRepo(collection *mongo.Collection) Repository {
	return &repository{
		Collection: collection,
	}
}

func NewMongoRepository(collection *mongo.Collection) Repository {
	return NewRepo(collection)
}

func (r *repository) CreateUser(user *entities.User) (*entities.User, error) {
	user.ID = primitive.NewObjectID()
	user.CreatedAt = time.Now()
	user.UpdatedAt = time.Now()

	_, err := r.Collection.InsertOne(context.Background(), user)
	if err != nil {
		return nil, err
	}
	return user, nil
}

func (r *repository) ReadUser(ID string) (*entities.User, error) {
	var user entities.User

	objectID, err := primitive.ObjectIDFromHex(ID)
	if err != nil {
		return nil, err
	}

	err = r.Collection.FindOne(context.Background(), bson.M{"_id": objectID}).Decode(&user)
	if err != nil {
		return nil, err
	}

	return &user, nil
}

func (r *repository) ReadUserByEmail(email string) (*entities.User, error) {
	var user entities.User

	err := r.Collection.FindOne(context.Background(), bson.M{"email": email}).Decode(&user)
	if err != nil {
		return nil, err
	}

	return &user, nil
}

func (r *repository) ReadAllUsers() (*[]presenter.User, error) {
	var users []presenter.User

	cursor, err := r.Collection.Find(context.Background(), bson.M{})
	if err != nil {
		return nil, err
	}

	for cursor.Next(context.TODO()) {
		var user presenter.User
		_ = cursor.Decode(&user)
		users = append(users, user)
	}

	return &users, nil
}

func (r *repository) UpdateUser(user *entities.User) (*entities.User, error) {
	user.UpdatedAt = time.Now()

	_, err := r.Collection.UpdateOne(
		context.Background(),
		bson.M{"_id": user.ID},
		bson.M{"$set": user},
	)
	if err != nil {
		return nil, err
	}

	return user, nil
}

func (r *repository) DeleteUser(ID string) error {
	objectID, err := primitive.ObjectIDFromHex(ID)
	if err != nil {
		return err
	}

	_, err = r.Collection.DeleteOne(context.Background(), bson.M{"_id": objectID})
	if err != nil {
		return err
	}

	return nil
}

func (r *repository) ReadUserByTelegramID(telegramID int64) (*entities.User, error) {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	var user entities.User
	filter := bson.M{"telegram_id": telegramID}

	err := r.Collection.FindOne(ctx, filter).Decode(&user)
	if err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, nil
		}
		return nil, err
	}

	return &user, nil
}

func (r *repository) UpdateUserTelegramData(user *entities.User) (*entities.User, error) {
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()

	user.UpdatedAt = time.Now()
	user.LastLoginDate = time.Now()

	filter := bson.M{"_id": user.ID}
	update := bson.M{"$set": bson.M{
		"telegram_id":       user.TelegramID,
		"telegram_username": user.TelegramUsername,
		"first_name":        user.FirstName,
		"last_name":         user.LastName,
		"photo_url":         user.PhotoURL,
		"last_login_date":   user.LastLoginDate,
		"updated_at":        user.UpdatedAt,
	}}

	_, err := r.Collection.UpdateOne(ctx, filter, update)
	if err != nil {
		return nil, err
	}

	return user, nil
}