package repository

import (
	"context"

	"go-backend-template/internal/entities"

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

type UserRepositoryImpl struct {
	b *gorm.DB
}

func NewUserRepository(db *gorm.DB) *UserRepositoryImpl {
	return &UserRepositoryImpl{
		b: db,
	}
}

func (r *UserRepositoryImpl) Create(ctx context.Context, user *entities.User) error {
	return r.b.WithContext(ctx).Create(user).Error
}

func (r *UserRepositoryImpl) GetByID(ctx context.Context, id uuid.UUID) (*entities.User, error) {
	var user entities.User
	err := r.b.WithContext(ctx).
		Preload("Profile").
		First(&user, "id = ?", id).Error
	if err != nil {
		return nil, err
	}
	return &user, nil
}

// GetByIDLight retrieves user without preloading relationships - for faster auth checks
func (r *UserRepositoryImpl) GetByIDLight(ctx context.Context, id uuid.UUID) (*entities.User, error) {
	var user entities.User
	err := r.b.WithContext(ctx).
		Where("id = ?", id).
		First(&user).Error
	if err != nil {
		return nil, err
	}
	return &user, nil
}

func (r *UserRepositoryImpl) GetByEmail(ctx context.Context, email string) (*entities.User, error) {
	var user entities.User
	err := r.b.WithContext(ctx).
		Preload("Profile").
		Where("email = ?", email).First(&user).Error
	if err != nil {
		return nil, err
	}
	return &user, nil
}

func (r *UserRepositoryImpl) GetByUsername(ctx context.Context, username string) (*entities.User, error) {
	var user entities.User
	err := r.b.WithContext(ctx).
		Preload("Profile").
		Where("username = ?", username).First(&user).Error
	if err != nil {
		return nil, err
	}
	return &user, nil
}

func (r *UserRepositoryImpl) GetByRole(ctx context.Context, role entities.UserRole) ([]*entities.User, error) {
	var users []*entities.User
	err := r.b.WithContext(ctx).Preload("Profile").Where("role = ?", role).Find(&users).Error
	return users, err
}

func (r *UserRepositoryImpl) GetActiveUsers(ctx context.Context) ([]*entities.User, error) {
	var users []*entities.User
	err := r.b.WithContext(ctx).
		Where("is_active = ?", true).
		Preload("Profile").
		Find(&users).Error
	return users, err
}

func (r *UserRepositoryImpl) Update(ctx context.Context, user *entities.User) error {
	return r.b.WithContext(ctx).Save(user).Error
}

func (r *UserRepositoryImpl) Delete(ctx context.Context, id uuid.UUID) error {
	return r.b.WithContext(ctx).Delete(&entities.User{}, "id = ?", id).Error
}

func (r *UserRepositoryImpl) UpdatePassword(ctx context.Context, id uuid.UUID, passwordHash string) error {
	return r.b.WithContext(ctx).Model(&entities.User{}).
		Where("id = ?", id).
		Update("password_hash", passwordHash).Error
}

func (r *UserRepositoryImpl) UpdateActiveStatus(ctx context.Context, id uuid.UUID, isActive bool) error {
	return r.b.WithContext(ctx).Model(&entities.User{}).
		Where("id = ?", id).
		Update("is_active", isActive).Error
}

func (r *UserRepositoryImpl) List(ctx context.Context, filters map[string]interface{}, limit, offset int) ([]*entities.User, int64, error) {
	var users []*entities.User
	var total int64

	query := r.b.WithContext(ctx).Model(&entities.User{})

	for key, value := range filters {
		query = query.Where(key+" = ?", value)
	}

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

	err := query.Limit(limit).Offset(offset).Preload("Profile").Find(&users).Error
	return users, total, err
}

func (r *UserRepositoryImpl) Count(ctx context.Context, filters map[string]interface{}) (int64, error) {
	var count int64
	query := r.b.WithContext(ctx).Model(&entities.User{})

	for key, value := range filters {
		query = query.Where(key+" = ?", value)
	}

	err := query.Count(&count).Error
	return count, err
}

func (r *UserRepositoryImpl) GetAll(ctx context.Context, page, limit int) ([]*entities.User, int64, error) {
	var users []*entities.User
	var total int64

	offset := (page - 1) * limit

	query := r.b.WithContext(ctx).Model(&entities.User{})

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

	err := query.Limit(limit).Offset(offset).Preload("Profile").Find(&users).Error
	return users, total, err
}

func (r *UserRepositoryImpl) ListWithFilters(ctx context.Context, search *string, isActive *bool, limit, offset int) ([]*entities.User, int64, error) {
	var users []*entities.User
	var total int64

	query := r.b.WithContext(ctx).Model(&entities.User{})

	if search != nil && *search != "" {
		like := "%" + *search + "%"
		query = query.Where("name ILIKE ? OR email ILIKE ? OR username ILIKE ?", like, like, like)
	}

	if isActive != nil {
		query = query.Where("is_active = ?", *isActive)
	}

	// Get total count
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	// Fetch users with preloads
	if err := query.
		Limit(limit).
		Offset(offset).
		Preload("Profile").
		Find(&users).Error; err != nil {
		return nil, 0, err
	}

	return users, total, nil
}