package rules

import (
	"fmt"
	"log"

	"git.beisel.it/florian/hostname-service/db"
)

type HostnameRule interface {
	Generate(params map[string]interface{}) (string, []byte, error)
	Insert(category string, hostname string, paramsJSON []byte) error
	Update(category string, oldhostname string, hostname string, paramsJSON []byte) error
}

type BaseRule struct{}

func (br *BaseRule) baseInsert(category string, hostname string, paramsJSON []byte) error {
	exists, err := db.HostnameExists(category, hostname)
	if err != nil {
		return fmt.Errorf("error checking existence of hostname: %v", err.Error())
	}
	if exists {
		return fmt.Errorf("hostname %s does not exist in category %s", hostname, category)
	}
	err = db.InsertHostname(category, hostname, paramsJSON)
	if err != nil {
		log.Printf("Error inserting hostname into DB: %v", err)
		return err
	}
	return nil
}

func (br *BaseRule) baseUpdate(category string, oldhostname string, hostname string, paramsJSON []byte) error {
	exists, err := db.HostnameExists(category, oldhostname)
	if err != nil {
		return fmt.Errorf("error checking existence of hostname: %v", err.Error())
	}
	if !exists {
		return fmt.Errorf("hostname %s does not exist in category %s", oldhostname, category)
	}

	err = db.UpdateHostname(category, oldhostname, hostname, paramsJSON)
	if err != nil {
		log.Printf("Error inserting hostname into DB: %v", err)
		return err
	}
	return nil
}