package repository

import (
	"context"
	"fmt"
	"log"
	"time"

	"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"
	"go.uber.org/zap"
	"penahub.gitlab.yandexcloud.net/pena-services/customer/internal/errors"
	"penahub.gitlab.yandexcloud.net/pena-services/customer/internal/fields"
	"penahub.gitlab.yandexcloud.net/pena-services/customer/internal/models"
	mongoWrapper "penahub.gitlab.yandexcloud.net/pena-services/customer/pkg/mongo"
)

type AccountRepositoryDeps struct {
	Logger  *zap.Logger
	MongoDB *mongo.Collection
}

type AccountRepository struct {
	logger  *zap.Logger
	mongoDB *mongo.Collection
}

func NewAccountRepository(deps *AccountRepositoryDeps) *AccountRepository {
	if deps == nil {
		log.Panicln("deps is nil on <NewAccountRepository>")
	}

	if deps.Logger == nil {
		log.Panicln("logger is nil on <NewAccountRepository>")
	}

	if deps.MongoDB == nil {
		log.Panicln("repository is nil on <NewAccountRepository>")
	}

	return &AccountRepository{
		logger:  deps.Logger,
		mongoDB: deps.MongoDB,
	}
}

func (receiver *AccountRepository) FindByUserID(ctx context.Context, id string) (*models.Account, errors.Error) {
	filter := bson.M{
		fields.Account.UserID:  id,
		fields.Account.Deleted: false,
	}

	account, err := mongoWrapper.FindOne[models.Account](ctx, &mongoWrapper.RequestSettings{
		Driver: receiver.mongoDB,
		Filter: filter,
	})
	if err != nil {
		receiver.logger.Error("failed to find account by userID on <FindByUserID> of <AccountRepository>",
			zap.String("id", id),
			zap.Error(err),
		)

		findError := errors.New(
			fmt.Errorf("failed to find account with <%s> on <FindByUserID> of <AccountRepository>: %w", id, err),
			errors.ErrInternalError,
		)

		if err == mongo.ErrNoDocuments {
			findError.SetType(errors.ErrNotFound)
		}

		return nil, findError
	}

	return account, nil
}

func (receiver *AccountRepository) FindMany(ctx context.Context, page, limit int64) ([]models.Account, errors.Error) {
	filter := bson.M{fields.Account.Deleted: false}
	findOptions := options.Find()

	skip := (page - 1) * limit

	findOptions.SetSkip(skip)
	findOptions.SetLimit(limit)

	accounts, err := mongoWrapper.Find[models.Account](ctx, &mongoWrapper.RequestSettings{
		Driver:  receiver.mongoDB,
		Options: findOptions,
		Filter:  filter,
	})
	if err != nil {
		receiver.logger.Error("failed to find many accounts on <FindMany> of <AccountRepository>",
			zap.Int64("page", page),
			zap.Int64("limit", limit),
			zap.Int64("skip", skip),
			zap.Error(err),
		)

		return nil, errors.New(
			fmt.Errorf("failed to find many accounts on <FindMany> of <AccountRepository>: %w", err),
			errors.ErrInternalError,
		)
	}

	return accounts, nil
}

func (receiver *AccountRepository) Insert(ctx context.Context, account *models.Account) (*models.Account, errors.Error) {
	account.CreatedAt = time.Now()
	account.UpdatedAt = time.Now()
	account.Deleted = false

	result, err := receiver.mongoDB.InsertOne(ctx, account)
	if err != nil {
		receiver.logger.Error("failed to insert account on <Insert> of <AccountRepository>",
			zap.Any("account", account),
			zap.Error(err),
		)

		return nil, errors.New(
			fmt.Errorf("failed to insert account on <Insert> of <AccountRepository>: %w", err),
			errors.ErrInternalError,
		)
	}

	insertedID := result.InsertedID.(primitive.ObjectID).Hex()
	account.ID = insertedID

	return account, nil
}

func (receiver *AccountRepository) Remove(ctx context.Context, id string) (*models.Account, errors.Error) {
	account := models.Account{}

	update := bson.M{"$set": bson.M{
		fields.Account.Deleted:   true,
		fields.Account.DeletedAt: time.Now(),
	}}

	filter := bson.M{
		fields.Account.UserID:  id,
		fields.Account.Deleted: false,
	}

	if err := receiver.mongoDB.FindOneAndUpdate(ctx, filter, update).Decode(&account); err != nil {
		receiver.logger.Error("failed to set 'deleted=true' on <Delete> of <AccountRepository>",
			zap.String("id", id),
			zap.Error(err),
		)

		removeErr := errors.New(
			fmt.Errorf("failed to remove account with <%s> on <Remove> of <AccountRepository>: %w", id, err),
			errors.ErrInternalError,
		)

		if err == mongo.ErrNoDocuments {
			removeErr.SetType(errors.ErrNotFound)
		}

		return nil, removeErr
	}

	return &account, nil
}

func (receiver *AccountRepository) Delete(ctx context.Context, id string) (*models.Account, errors.Error) {
	account := models.Account{}

	filter := bson.M{
		fields.Account.UserID:  id,
		fields.Account.Deleted: false,
	}

	if err := receiver.mongoDB.FindOneAndDelete(ctx, filter).Decode(&account); err != nil {
		receiver.logger.Error("failed delete account on <Delete> of <AccountRepository>",
			zap.String("id", id),
			zap.Error(err),
		)

		removeErr := errors.New(
			fmt.Errorf("failed to remove account with <%s> on <Delete> of <AccountRepository>: %w", id, err),
			errors.ErrInternalError,
		)

		if err == mongo.ErrNoDocuments {
			removeErr.SetType(errors.ErrNotFound)
		}

		return nil, removeErr
	}

	return &account, nil
}

func (receiver *AccountRepository) CountAll(ctx context.Context) (int64, errors.Error) {
	count, err := receiver.mongoDB.CountDocuments(ctx, bson.M{fields.Account.Deleted: false})
	if err != nil {
		receiver.logger.Error("failed to count all documents on <CountAll> of <AccountRepository>",
			zap.Error(err),
		)

		return 0, errors.New(
			fmt.Errorf("failed to count all documents on <CountAll> of <AccountRepository>: %w", err),
			errors.ErrInternalError,
		)
	}

	return count, nil
}