package repository

import (
	"apskel-pos-be/internal/entities"
	"context"
	"fmt"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

type CustomerTokensRepository struct {
	db *gorm.DB
}

func NewCustomerTokensRepository(db *gorm.DB) *CustomerTokensRepository {
	return &CustomerTokensRepository{db: db}
}

func (r *CustomerTokensRepository) Create(ctx context.Context, customerTokens *entities.CustomerTokens) error {
	return r.db.WithContext(ctx).Create(customerTokens).Error
}

func (r *CustomerTokensRepository) GetByID(ctx context.Context, id uuid.UUID) (*entities.CustomerTokens, error) {
	var customerTokens entities.CustomerTokens
	err := r.db.WithContext(ctx).Preload("Customer").Where("id = ?", id).First(&customerTokens).Error
	if err != nil {
		return nil, err
	}
	return &customerTokens, nil
}

func (r *CustomerTokensRepository) GetByCustomerIDAndType(ctx context.Context, customerID uuid.UUID, tokenType entities.TokenType) (*entities.CustomerTokens, error) {
	var customerTokens entities.CustomerTokens
	err := r.db.WithContext(ctx).Preload("Customer").Where("customer_id = ? AND token_type = ?", customerID, tokenType).First(&customerTokens).Error
	if err != nil {
		return nil, err
	}
	return &customerTokens, nil
}

func (r *CustomerTokensRepository) GetByCustomerID(ctx context.Context, customerID uuid.UUID) ([]entities.CustomerTokens, error) {
	var customerTokens []entities.CustomerTokens
	err := r.db.WithContext(ctx).Preload("Customer").Where("customer_id = ?", customerID).Find(&customerTokens).Error
	if err != nil {
		return nil, err
	}
	return customerTokens, nil
}

func (r *CustomerTokensRepository) List(ctx context.Context, offset, limit int, search, tokenType string, sortBy, sortOrder string) ([]entities.CustomerTokens, int64, error) {
	var customerTokens []entities.CustomerTokens
	var total int64

	query := r.db.WithContext(ctx).Preload("Customer")

	if search != "" {
		searchTerm := "%" + search + "%"
		query = query.Joins("JOIN customers ON customer_tokens.customer_id = customers.id").
			Where("customers.name ILIKE ? OR customers.email ILIKE ?", searchTerm, searchTerm)
	}

	if tokenType != "" {
		query = query.Where("token_type = ?", tokenType)
	}

	if err := query.Model(&entities.CustomerTokens{}).Count(&total).Error; err != nil {
		return nil, 0, err
	}

	if sortBy != "" {
		if sortOrder == "" {
			sortOrder = "asc"
		}
		query = query.Order(fmt.Sprintf("customer_tokens.%s %s", sortBy, sortOrder))
	} else {
		query = query.Order("customer_tokens.created_at DESC")
	}

	err := query.Offset(offset).Limit(limit).Find(&customerTokens).Error
	if err != nil {
		return nil, 0, err
	}

	return customerTokens, total, nil
}

func (r *CustomerTokensRepository) Update(ctx context.Context, customerTokens *entities.CustomerTokens) error {
	return r.db.WithContext(ctx).Save(customerTokens).Error
}

func (r *CustomerTokensRepository) Delete(ctx context.Context, id uuid.UUID) error {
	return r.db.WithContext(ctx).Delete(&entities.CustomerTokens{}, id).Error
}

func (r *CustomerTokensRepository) AddTokens(ctx context.Context, customerID uuid.UUID, tokenType entities.TokenType, tokens int64) error {
	return r.db.WithContext(ctx).Model(&entities.CustomerTokens{}).
		Where("customer_id = ? AND token_type = ?", customerID, tokenType).
		Update("balance", gorm.Expr("balance + ?", tokens)).Error
}

func (r *CustomerTokensRepository) DeductTokens(ctx context.Context, customerID uuid.UUID, tokenType entities.TokenType, tokens int64) error {
	return r.db.WithContext(ctx).Model(&entities.CustomerTokens{}).
		Where("customer_id = ? AND token_type = ? AND balance >= ?", customerID, tokenType, tokens).
		Update("balance", gorm.Expr("balance - ?", tokens)).Error
}

func (r *CustomerTokensRepository) EnsureCustomerTokens(ctx context.Context, customerID uuid.UUID, tokenType entities.TokenType) (*entities.CustomerTokens, error) {
	customerTokens, err := r.GetByCustomerIDAndType(ctx, customerID, tokenType)
	if err == nil {
		return customerTokens, nil
	}

	if err != gorm.ErrRecordNotFound {
		return nil, err
	}

	// Create new customer tokens record
	newCustomerTokens := &entities.CustomerTokens{
		CustomerID: customerID,
		TokenType:  tokenType,
		Balance:    0,
	}

	err = r.Create(ctx, newCustomerTokens)
	if err != nil {
		return nil, err
	}

	return newCustomerTokens, nil
}