package bundb

import (
	"context"
	"database/sql"
	"errors"
	"fmt"

	"gitea.dwysokinski.me/twhelp/sessions/internal/bundb/internal/model"
	"gitea.dwysokinski.me/twhelp/sessions/internal/domain"
	"github.com/jackc/pgerrcode"
	"github.com/uptrace/bun"
	"github.com/uptrace/bun/driver/pgdriver"
)

type APIKey struct {
	db *bun.DB
}

func NewAPIKey(db *bun.DB) *APIKey {
	return &APIKey{db: db}
}

func (a *APIKey) Create(ctx context.Context, params domain.CreateAPIKeyParams) (domain.APIKey, error) {
	apiKey := model.NewAPIKey(params)

	if _, err := a.db.NewInsert().
		Model(&apiKey).
		Returning("*").
		Exec(ctx); err != nil {
		return domain.APIKey{}, fmt.Errorf(
			"something went wrong while inserting api key into the db: %w",
			mapCreateAPIKeyError(err, params),
		)
	}

	return apiKey.ToDomain(), nil
}

func (a *APIKey) Get(ctx context.Context, key string) (domain.APIKey, error) {
	var ak model.APIKey

	if err := a.db.NewSelect().
		Model(&ak).
		Where("key = ?", key).
		Scan(ctx); err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			return domain.APIKey{}, domain.APIKeyNotFoundError{Key: key}
		}
		return domain.APIKey{}, fmt.Errorf(
			"something went wrong while selecting api key (key=%s) from the db: %w",
			key,
			err,
		)
	}

	return ak.ToDomain(), nil
}

func mapCreateAPIKeyError(err error, params domain.CreateAPIKeyParams) error {
	var pgError pgdriver.Error
	if !errors.As(err, &pgError) {
		return err
	}

	code := pgError.Field('C')
	constraint := pgError.Field('n')
	switch {
	case code == pgerrcode.ForeignKeyViolation && constraint == "api_keys_user_id_fkey":
		return domain.UserDoesNotExistError{
			ID: params.UserID(),
		}
	default:
		return err
	}
}