package main

import (
	"errors"

	bolt "go.etcd.io/bbolt"
)

// Card represents a card on a Kanban board.
type Card struct {
	ID      int
	Title   string
	Content string
}

// TODO: this function needs to be unit tested and documented.
func createCard(db *bolt.DB, title, content string) error {
	// first ensure that there is a status list in the database
	statusList, err := loadAllStatuses(db)
	if err != nil {
		return err
	}

	if len(statusList) == 0 {
		return errors.New("the status list cannot be empty")
	}

	card := Card{
		ID:      -1,
		Title:   title,
		Content: content,
	}

	cardID, err := saveCard(db, card)
	if err != nil {
		return err
	}

	cardIDs := statusList[0].CardIds

	cardIDs = append(cardIDs, cardID)

	statusList[0].CardIds = cardIDs

	// TODO: change the below to save a single status
	if err := saveStatuses(db, statusList); err != nil {
		return err
	}

	return nil
}

// readCard returns a Card value from the database.
func readCard(db *bolt.DB, id int) (Card, error) {
	return loadCard(db, id)
}

// TODO: unit test and document this function.
func updateCard(db *bolt.DB, id int, title, content string) error {
	card, err := loadCard(db, id)
	if err != nil {
		return nil
	}

	card.Title = title
	card.Content = content

	if _, err := saveCard(db, card); err != nil {
		return err
	}

	return nil
}

// TODO: finish implementation
func moveCard(db *bolt.DB, fromStatusID, toStatusID int) error {
	return nil
}

// TODO: finish implementation
func deleteCard(db *bolt.DB, id int) error {
	return nil
}