package repository

import (
	"context"

	"github.com/Caknoooo/go-gin-clean-starter/database/entities"
	"github.com/Caknoooo/go-gin-clean-starter/modules/client/query"
	"github.com/google/uuid"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

type (
	ClientRepository interface {
		Create(ctx context.Context, tx *gorm.DB, client entities.M_Client) (entities.M_Client, error)
		GetById(ctx context.Context, tx *gorm.DB, clientId string) (entities.M_Client, error)
		GetByName(ctx context.Context, tx *gorm.DB, name string) (entities.M_Client, error)
		GetAll(ctx context.Context, filter query.ClientFilter) ([]entities.M_Client, int64, error)
		Update(ctx context.Context, tx *gorm.DB, client entities.M_Client) (entities.M_Client, error)
		Delete(ctx context.Context, tx *gorm.DB, clientId string) error
		AssignMenusToClient(ctx context.Context, tx *gorm.DB, clientId string, menuIds []string) error
		RemoveMenusFromClient(ctx context.Context, tx *gorm.DB, clientId string, menuIds []string) error
	}

	clientRepository struct {
		db *gorm.DB
	}
)

func (r *clientRepository) GetAll(ctx context.Context, filter query.ClientFilter) ([]entities.M_Client, int64, error) {
	var clients []entities.M_Client
	var total int64

	db := r.db.Model(&entities.M_Client{})
	db = query.ApplyClientFilters(db, filter)

	// Hitung total data
	if err := db.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	// Ambil data dengan pagination dan preload menus
	err := db.
		Preload("Menus").
		Limit(filter.PerPage).
		Offset(filter.Page).
		Find(&clients).Error

	return clients, total, err
}

func (r *clientRepository) Create(ctx context.Context, tx *gorm.DB, client entities.M_Client) (entities.M_Client, error) {
	if tx == nil {
		tx = r.db
	}
	if client.ID == uuid.Nil {
		client.ID = uuid.New()
	}
	if err := tx.WithContext(ctx).Create(&client).Error; err != nil {
		return entities.M_Client{}, err
	}
	return client, nil
}

func (r *clientRepository) GetById(ctx context.Context, tx *gorm.DB, clientId string) (entities.M_Client, error) {
	if tx == nil {
		tx = r.db
	}
	var client entities.M_Client
	if err := tx.WithContext(ctx).
		Preload("Menus").
		First(&client, "id = ?", clientId).Error; err != nil {
		return entities.M_Client{}, err
	}
	return client, nil
}

func (r *clientRepository) GetByName(ctx context.Context, tx *gorm.DB, name string) (entities.M_Client, error) {
	if tx == nil {
		tx = r.db
	}
	var client entities.M_Client
	if err := tx.WithContext(ctx).Where("name = ?", name).First(&client).Error; err != nil {
		return entities.M_Client{}, err
	}
	return client, nil
}

func (r *clientRepository) Update(ctx context.Context, tx *gorm.DB, client entities.M_Client) (entities.M_Client, error) {
	if tx == nil {
		tx = r.db
	}
	if err := tx.WithContext(ctx).Updates(&client).Error; err != nil {
		return entities.M_Client{}, err
	}
	return client, nil
}

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

// AssignMenusToClient implements MenuRepository.
func (c *clientRepository) AssignMenusToClient(ctx context.Context, tx *gorm.DB, clientId string, menuIds []string) error {
	if tx == nil {
		tx = c.db
	}

	var menuClients []entities.M_Menu_Client
	for _, menuId := range menuIds {
		menuClient := entities.M_Menu_Client{}
		if err := menuClient.MenuID.UnmarshalText([]byte(menuId)); err != nil {
			return err
		}
		if err := menuClient.ClientID.UnmarshalText([]byte(clientId)); err != nil {
			return err
		}
		menuClients = append(menuClients, menuClient)
	}
	// Use Create with OnConflict to ignore duplicates
	if err := tx.WithContext(ctx).Clauses(
		// Only insert if not exists (Postgres syntax, adjust if needed)
		clause.OnConflict{DoNothing: true},
	).Create(&menuClients).Error; err != nil {
		return err
	}
	return nil
}

// RemoveMenusFromClient implements MenuRepository.
func (c *clientRepository) RemoveMenusFromClient(ctx context.Context, tx *gorm.DB, clientId string, menuIds []string) error {
	if tx == nil {
		tx = c.db
	}

	if err := tx.WithContext(ctx).
		Where("menu_id IN ? AND client_id = ?", menuIds, clientId).
		Delete(&entities.M_Menu_Client{}).Error; err != nil {
		return err
	}

	return nil
}

func NewClientRepository(db *gorm.DB) ClientRepository {
	return &clientRepository{db: db}
}