package repository

import (
	"context"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	"github.com/Caknoooo/go-gin-clean-starter/modules/product/query"
	"gorm.io/gorm"
)

type ProductRepository interface {
	Create(ctx context.Context, tx *gorm.DB, product entities.MProductEntity) (entities.MProductEntity, error)
	GetById(ctx context.Context, tx *gorm.DB, productId string) (entities.MProductEntity, error)
	GetAll(ctx context.Context, filter query.ProductFilter) ([]entities.MProductEntity, int64, error)
	Update(ctx context.Context, tx *gorm.DB, product entities.MProductEntity) (entities.MProductEntity, error)
	Delete(ctx context.Context, tx *gorm.DB, productId string) error
}

type productRepository struct {
	db *gorm.DB
}

func NewProductRepository(db *gorm.DB) ProductRepository {
	return &productRepository{db: db}
}

func (r *productRepository) Create(ctx context.Context, tx *gorm.DB, product entities.MProductEntity) (entities.MProductEntity, error) {
	if tx == nil {
		tx = r.db
	}
	if err := tx.WithContext(ctx).Create(&product).Error; err != nil {
		return product, err
	}
	return product, nil
}

func (r *productRepository) GetById(ctx context.Context, tx *gorm.DB, productId string) (entities.MProductEntity, error) {
	if tx == nil {
		tx = r.db
	}
	var product entities.MProductEntity
	if err := tx.WithContext(ctx).First(&product, "id = ?", productId).Error; err != nil {
		return product, err
	}
	return product, nil
}

func (r *productRepository) GetAll(ctx context.Context, filter query.ProductFilter) ([]entities.MProductEntity, int64, error) {
	var products []entities.MProductEntity
	var total int64
	db := r.db.Model(&entities.MProductEntity{})
	db = query.ApplyProductFilters(db, filter)
	if err := db.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	err := db.Limit(filter.PerPage).Offset(filter.Page).Find(&products).Error
	return products, total, err
}

func (r *productRepository) Update(ctx context.Context, tx *gorm.DB, product entities.MProductEntity) (entities.MProductEntity, error) {
	if tx == nil {
		tx = r.db
	}
	if err := tx.WithContext(ctx).Save(&product).Error; err != nil {
		return product, err
	}
	return product, nil
}

func (r *productRepository) Delete(ctx context.Context, tx *gorm.DB, productId string) error {
	if tx == nil {
		tx = r.db
	}
	if err := tx.WithContext(ctx).Delete(&entities.MProductEntity{}, "id = ?", productId).Error; err != nil {
		return err
	}
	return nil
}