package registry

import (
	"context"
	"database/sql"
	"strings"

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

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

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

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

	_, err = r.db.ExecContext(ctx,
		`INSERT INTO lots (id, code, description) VALUES (?, ?, ?)`,
		id, code, description,
	)
	if err != nil {
		return domain.Lot{}, classifyError(err)
	}

	return r.Get(ctx, id)
}

func (r *LotRepository) Get(ctx context.Context, id string) (domain.Lot, error) {
	var lot domain.Lot
	var description sql.NullString

	row := r.db.QueryRowContext(ctx,
		`SELECT id, code, description, created_at, updated_at FROM lots WHERE id = ?`,
		id,
	)
	if err := row.Scan(&lot.ID, &lot.Code, &description, &lot.CreatedAt, &lot.UpdatedAt); err != nil {
		if err == sql.ErrNoRows {
			return domain.Lot{}, ErrNotFound
		}
		return domain.Lot{}, err
	}

	lot.Description = nullStringToPtr(description)
	return lot, nil
}

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

	lots := make([]domain.Lot, 0)
	for rows.Next() {
		var lot domain.Lot
		var description sql.NullString

		if err := rows.Scan(&lot.ID, &lot.Code, &description, &lot.CreatedAt, &lot.UpdatedAt); err != nil {
			return nil, err
		}
		lot.Description = nullStringToPtr(description)
		lots = append(lots, lot)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}

	return lots, nil
}

func (r *LotRepository) EnsureByCode(ctx context.Context, code string) (domain.Lot, error) {
	normalized := strings.TrimSpace(code)
	if normalized == "" {
		return domain.Lot{}, ErrNotFound
	}

	var id string
	err := r.db.QueryRowContext(ctx,
		`SELECT id FROM lots WHERE code = ? LIMIT 1`,
		normalized,
	).Scan(&id)
	if err == nil {
		return r.Get(ctx, id)
	}
	if err != sql.ErrNoRows {
		return domain.Lot{}, err
	}

	return r.Create(ctx, normalized, nil)
}