package repository

import (
	"errors"
	"github.com/jmoiron/sqlx"
	"go.mongodb.org/mongo-driver/v2/bson"
	"go.mongodb.org/mongo-driver/v2/mongo"
	"go.mongodb.org/mongo-driver/v2/mongo/options"
	"time"

	"git.urec56.ru/urec/chat_back_go/internal/database"
	"git.urec56.ru/urec/chat_back_go/internal/domain"
	"git.urec56.ru/urec/chat_back_go/internal/logger"
)

type messageRepository struct {
	db *sqlx.DB
	mc *mongo.Collection
	l  *logger.Logger
}

type SendMessage struct {
	ID             domain.UUID `bson:"id"`
	Message        string      `bson:"message,omitempty"`
	ImageUrl       string      `bson:"image_url,omitempty"`
	ChatID         int         `bson:"chat_id"`
	UserID         int         `bson:"user_id"`
	CreatedAt      time.Time   `bson:"created_at"`
	AnswerID       domain.UUID `bson:"answer_id,omitempty"`
	AnswerMessage  string      `bson:"answer_message,omitempty"`
	AnswerImageUrl string      `bson:"answer_image_url,omitempty"`
	Visibility     bool        `bson:"visibility"`
}

type EditMessage struct {
	ID                domain.UUID
	Message, ImageUrl string
}

type PinMessage struct {
	ChatID, UserID int
	MessageID      domain.UUID
}

type UnpinMessage struct {
	ChatID    int
	MessageID domain.UUID
}

type GetSome struct {
	ChatID, Offset, Limit int
}

func newMessageRepo(db *sqlx.DB, mdb *mongo.Database, l *logger.Logger) *messageRepository {
	return &messageRepository{db: db, mc: mdb.Collection("message"), l: l}
}

func (r *messageRepository) Get(ID domain.UUID) (domain.RawMessage, error) {
	var msg domain.RawMessage
	res := r.mc.FindOne(nil, bson.M{"id": ID})

	if err := res.Decode(&msg); err != nil {
		r.l.Errorf("getting message: %s", err)
		return domain.RawMessage{}, domain.InternalServerError
	}

	return msg, nil
}

func (r *messageRepository) GetByIDs(IDs []domain.UUID) ([]domain.RawMessage, error) {
	var messages []domain.RawMessage
	res, err := r.mc.Find(nil, bson.M{"visibility": true, "id": bson.M{"$in": IDs}})
	if err != nil {
		r.l.Errorf("getting messages by ids: %s", err)
		return nil, domain.InternalServerError
	}

	if err = res.All(nil, &messages); err != nil {
		r.l.Errorf("decoding messages by ids: %s", err)
		return nil, domain.InternalServerError
	}

	return messages, nil
}

func (r *messageRepository) GetSome(messagesInfo GetSome) ([]domain.RawMessage, error) {
	var messages []domain.RawMessage
	findOptions := options.Find().SetSort(bson.M{"created_at": -1}).SetLimit(int64(messagesInfo.Limit)).SetSkip(int64(messagesInfo.Offset))
	res, err := r.mc.Find(nil, bson.M{"visibility": true, "chat_id": messagesInfo.ChatID}, findOptions)
	if err != nil {
		r.l.Errorf("getting some messages: %s", err)
		return nil, domain.InternalServerError
	}

	if err = res.All(nil, &messages); err != nil {
		r.l.Errorf("decoding some messages: %s", err)
		return nil, domain.InternalServerError
	}

	return messages, nil
}

func (r *messageRepository) Send(message SendMessage) (domain.RawMessage, error) {
	message.ID = domain.GenerateUUID()
	message.CreatedAt = time.Now()
	message.Visibility = true

	_, err := r.mc.InsertOne(nil, message)
	if err != nil {
		r.l.Errorf("inserting message: %s", err)
		return domain.RawMessage{}, domain.InternalServerError
	}

	return domain.RawMessage{
		ID:             message.ID,
		Message:        message.Message,
		ImageUrl:       message.ImageUrl,
		ChatID:         message.ChatID,
		UserID:         message.UserID,
		CreatedAt:      message.CreatedAt,
		AnswerID:       message.AnswerID,
		AnswerMessage:  message.AnswerMessage,
		AnswerImageUrl: message.AnswerImageUrl,
	}, nil
}

func (r *messageRepository) Delete(ID domain.UUID) error {
	if _, err := r.mc.UpdateOne(nil, bson.M{"id": ID}, bson.M{"$set": bson.M{"visibility": false}}); err != nil {
		r.l.Errorf("deleting message: %s", err)
		return domain.InternalServerError
	}

	_, err := r.mc.UpdateMany(nil, bson.M{"answer_id": ID}, bson.M{"$set": bson.M{"answer_message": nil, "answer_image_url": nil}})
	if err != nil {
		r.l.Errorf("deleting message: %s", err)
		return domain.InternalServerError
	}

	return nil
}
func (r *messageRepository) Edit(newMessage EditMessage) error {
	_, err := r.mc.UpdateOne(nil, bson.M{"id": newMessage.ID}, bson.M{"$set": bson.M{"message": newMessage.Message, "image_url": newMessage.ImageUrl}})
	if err != nil {
		r.l.Errorf("edditing message: %s", err)
		return domain.InternalServerError
	}

	_, err = r.mc.UpdateMany(nil, bson.M{"answer_id": newMessage.ID}, bson.M{"$set": bson.M{"answer_message": newMessage.Message, "answer_image_url": newMessage.ImageUrl}})
	if err != nil {
		r.l.Errorf("edditing message: %s", err)
		return domain.InternalServerError
	}

	return nil
}

func (r *messageRepository) Pin(msg PinMessage) error {
	query := `INSERT INTO pinned_message (chat_id, message_id, user_id) VALUES ($1, $2, $3)`
	if _, err := r.db.Exec(query, msg.ChatID, msg.MessageID, msg.UserID); err != nil {
		if errors.Is(err, database.IntegrityError) {
			return domain.MessageAlreadyPinnedError
		}

		r.l.Errorf("pining message: %s", err)
		return domain.InternalServerError
	}

	return nil
}

func (r *messageRepository) Unpin(msg UnpinMessage) error {
	query := `DELETE FROM pinned_message WHERE chat_id = $1 AND message_id = $2`
	if _, err := r.db.Exec(query, msg.ChatID, msg.MessageID); err != nil {
		r.l.Errorf("unpining message: %s", err)
		return domain.InternalServerError
	}

	return nil
}

func (r *messageRepository) GetPinnedIDs(chatID int) ([]domain.UUID, error) {
	var IDs []domain.UUID
	query := `SELECT message_id FROM pinned_message WHERE chat_id = $1`
	if err := r.db.Select(&IDs, query, chatID); err != nil {
		r.l.Errorf("getting pinned ids: %s", err)
		return []domain.UUID{}, domain.InternalServerError
	}

	return IDs, nil
}