package meowlib

import (
	"errors"
	"os"

	"github.com/google/uuid"
)

func (msg *UserMessage) AddFile(filename string, maxMessageSize int64) error {
	fi, err := os.Stat(filename)
	if err != nil {
		return err
	}
	if fi.Size() > maxMessageSize {
		return errors.New("Cannot add file, file bigger than messge size")
	}
	var totalsize int64
	totalsize = 0
	for _, f := range msg.Files {
		totalsize += int64(f.Size)
	}
	totalsize += fi.Size()
	if totalsize > maxMessageSize {
		return errors.New("Cannot add file, too many files, max message size exceeded")
	}
	data, err := os.ReadFile(filename)
	if err != nil {
		return err
	}

	var file File
	file.Filename = filename
	file.Size = uint64(fi.Size())
	file.Data = data
	msg.Files = append(msg.Files, &file)

	msg.Status = &UserMessage_ConversationStatus{}
	msg.Status.LocalUuid = uuid.New().String()

	return nil
}