package db

import (
	"context"
	"fmt"
	"log"

	"code.lila.network/adoralaura/go-urlsh/models"
)

// UserHasMFA checks the DB if given models.User has MFA enabled.
// Returns (true, nil) if User has MFA enabled, (false, nil) if not.
// (false, error) if a DB error happened
func UserHasMFA(user models.User) (bool, error) {
	numrows, err := models.DB.NewSelect().Model((*models.MFAConfig)(nil)).Where("username = ?", user.UserName).Where("active = ?", true).Count(context.Background())
	if err != nil {
		return false, fmt.Errorf("[UserHasMFA] error getting MFA count from database: %q", err)
	}

	if numrows >= 1 {
		return true, nil
	}
	return false, nil
}

// ScratchCodeUnique checks the database if the generated scratch code
// is unique (not in the database yet)
func ScratchCodeIsUnique(scratchcode string) bool {
	var dbitem models.MFAScratchCode
	numrows, err := models.DB.NewSelect().Model(&dbitem).Where("code = ?", scratchcode).Count(context.Background())
	if err != nil {
		return false
	}

	if numrows != 0 {
		return false
	}
	return true
}

// RemoveMFAFromDB removes MFA entries for given models.User from the database.
// Returns nil on success, error otherwise.
func RemoveMFAFromDB(user models.User) error {
	hasMfa, err := UserHasMFA(user)
	if err != nil {
		return fmt.Errorf("[RemoveMFAFromDB] Error removing MFA from DB for user %v: %w", user.UserName, err)
	}

	if !hasMfa {
		return nil
	}

	_, err = models.DB.NewDelete().Model((*models.MFAConfig)(nil)).Where("username = ?", user.UserName).Exec(context.Background())
	if err != nil {
		log.Println(err.Error())
		return fmt.Errorf("[RemoveMFAFromDB] Error removing MFA Config from DB for user %v: %w", user.UserName, err)
	}

	_, err = models.DB.NewDelete().Model((*models.MFAScratchCode)(nil)).Where("username = ?", user.UserName).Exec(context.Background())
	if err != nil {
		log.Println(err.Error())
		return fmt.Errorf("[RemoveMFAFromDB] Error removing MFA scratch codes from DB for user %v: %w", user.UserName, err)
	}

	return nil
}