package registry

import (
	"context"
	"database/sql"

	"reanimator/internal/domain"
	"reanimator/internal/idgen"
)

type CustomerRepository struct {
	db    *sql.DB
	idgen *idgen.Generator
}

func NewCustomerRepository(db *sql.DB) *CustomerRepository {
	return &CustomerRepository{
		db:    db,
		idgen: idgen.NewGenerator(db),
	}
}

func (r *CustomerRepository) Create(ctx context.Context, name string) (domain.Customer, error) {
	// Generate string ID
	id, err := r.idgen.Generate(ctx, idgen.Customer)
	if err != nil {
		return domain.Customer{}, err
	}

	_, err = r.db.ExecContext(ctx,
		`INSERT INTO customers (id, name) VALUES (?, ?)`,
		id, name,
	)
	if err != nil {
		return domain.Customer{}, classifyError(err)
	}

	return r.Get(ctx, id)
}

func (r *CustomerRepository) Get(ctx context.Context, id string) (domain.Customer, error) {
	var customer domain.Customer

	row := r.db.QueryRowContext(ctx,
		`SELECT id, name, created_at, updated_at FROM customers WHERE id = ?`,
		id,
	)
	if err := row.Scan(&customer.ID, &customer.Name, &customer.CreatedAt, &customer.UpdatedAt); err != nil {
		if err == sql.ErrNoRows {
			return domain.Customer{}, ErrNotFound
		}
		return domain.Customer{}, err
	}

	return customer, nil
}

func (r *CustomerRepository) List(ctx context.Context) ([]domain.Customer, error) {
	rows, err := r.db.QueryContext(ctx,
		`SELECT id, name, created_at, updated_at FROM customers ORDER BY created_at DESC`,
	)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	customers := make([]domain.Customer, 0)
	for rows.Next() {
		var customer domain.Customer
		if err := rows.Scan(&customer.ID, &customer.Name, &customer.CreatedAt, &customer.UpdatedAt); err != nil {
			return nil, err
		}
		customers = append(customers, customer)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}

	return customers, nil
}