package messages

import "errors"

type Message struct {
	MessageId uint64 `json:"message_id"`
	Author_id uint64 `json:"author_id"`
	Text string `json:"text"`
}

var messages []Message

func initMessages() {
	messages = make([]Message, 0)
}

func insertMessage(msg Message) error {
	if msg.Author_id == 0 {
		return errors.New("An author_id must be specified")
	}

	if msg.Text == "" {
		return errors.New("The field text must not be empty")
	}

	messages = append(messages, Message{
		MessageId: uint64(len(messages)),
		Text: msg.Text,
		Author_id: msg.Author_id,
	})

	return nil
}

func getAllMessages() []Message {
	return messages
}

func getMessageById(id uint64) (Message, error) {
	if int(id) >= len(messages) {
		return Message{}, errors.New("Message doesn't exists")
	}

	return messages[id], nil
}