package models

import (
	"time"
)

const (
	NoteTitleMaxLength = 50
)

// Note represents a single note with its metadata.
type Note struct {
	// ID is the unique identifier of the note.
	ID int `json:"id"`
	// Title is a short title for human identification of a note
	Title string `json:"title"`
	// LastUpdate is the timestamp of when the note was last modified.
	LastUpdate time.Time `json:"last_update"`
	// Content is the actual text content of the note.
	Content string `json:"content"`
}

func (n *Note) Validate() error {
	errs := []error{}
	if n.Title == "" {
		errs = append(errs, &ErrEmptyNoteTitle{})
	}
	if n.Content == "" {
		errs = append(errs, &ErrEmptyNoteContent{})
	}
	if len(errs) != 0 {
		return &ErrNoteIncomplete{why: errs}
	}
	if titleLen := len(n.Title); titleLen > NoteTitleMaxLength {
		return &ErrNoteTitleOverflow{
			length: titleLen,
		}
	}
	return nil
}