package registry

import (
	"context"
	"database/sql"

	"reanimator/internal/domain"
)

type ComponentRepository struct {
	db *sql.DB
}

func NewComponentRepository(db *sql.DB) *ComponentRepository {
	return &ComponentRepository{db: db}
}

func (r *ComponentRepository) Create(ctx context.Context, component domain.Component) (domain.Component, error) {
	var lotID interface{}
	if component.LotID != nil {
		lotID = *component.LotID
	}
	var firstSeen interface{}
	if component.FirstSeenAt != nil {
		firstSeen = *component.FirstSeenAt
	}

	result, err := r.db.ExecContext(ctx,
		`INSERT INTO components (lot_id, vendor, model, vendor_serial, first_seen_at)
		 VALUES (?, ?, ?, ?, ?)`,
		lotID,
		component.Vendor,
		component.Model,
		component.VendorSerial,
		firstSeen,
	)
	if err != nil {
		return domain.Component{}, classifyError(err)
	}

	id, err := result.LastInsertId()
	if err != nil {
		return domain.Component{}, err
	}

	return r.Get(ctx, id)
}

func (r *ComponentRepository) Get(ctx context.Context, id int64) (domain.Component, error) {
	var component domain.Component
	var lotID sql.NullInt64
	var vendor sql.NullString
	var model sql.NullString
	var firstSeen sql.NullTime

	row := r.db.QueryRowContext(ctx,
		`SELECT id, lot_id, vendor, model, vendor_serial, first_seen_at, created_at, updated_at
		 FROM components WHERE id = ?`,
		id,
	)
	if err := row.Scan(&component.ID, &lotID, &vendor, &model, &component.VendorSerial, &firstSeen, &component.CreatedAt, &component.UpdatedAt); err != nil {
		if err == sql.ErrNoRows {
			return domain.Component{}, ErrNotFound
		}
		return domain.Component{}, err
	}

	component.LotID = nullInt64ToPtr(lotID)
	component.Vendor = nullStringToPtr(vendor)
	component.Model = nullStringToPtr(model)
	component.FirstSeenAt = nullTimeToPtr(firstSeen)

	return component, nil
}

func (r *ComponentRepository) List(ctx context.Context) ([]domain.Component, error) {
	rows, err := r.db.QueryContext(ctx,
		`SELECT id, lot_id, vendor, model, vendor_serial, first_seen_at, created_at, updated_at
		 FROM components ORDER BY id`,
	)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	components := make([]domain.Component, 0)
	for rows.Next() {
		var component domain.Component
		var lotID sql.NullInt64
		var vendor sql.NullString
		var model sql.NullString
		var firstSeen sql.NullTime

		if err := rows.Scan(&component.ID, &lotID, &vendor, &model, &component.VendorSerial, &firstSeen, &component.CreatedAt, &component.UpdatedAt); err != nil {
			return nil, err
		}

		component.LotID = nullInt64ToPtr(lotID)
		component.Vendor = nullStringToPtr(vendor)
		component.Model = nullStringToPtr(model)
		component.FirstSeenAt = nullTimeToPtr(firstSeen)
		components = append(components, component)
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}

	return components, nil
}