package files

import (
	"fmt"
	"io"
	"os"
	fp "path/filepath"
	"strings"

	"codeberg.org/danjones000/my-log/config"
	"codeberg.org/danjones000/my-log/models"
)

func Append(l models.Log) error {
	conf, err := config.Load()
	if err != nil {
		return err
	}

	filename := l.Name
	if conf.Input.DotFolder {
		filename = strings.ReplaceAll(filename, ".", string(os.PathSeparator))
	}

	if conf.Input.Ext != "" {
		filename = fmt.Sprintf("%s.%s", filename, conf.Input.Ext)
	}
	path := fp.Join(conf.Input.Path, filename)
	dir := fp.Dir(path)
	err = os.MkdirAll(dir, 0750)
	if err != nil {
		return err
	}

	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_RDWR, 0640)
	if err != nil {
		return err
	}
	defer f.Close()

	f.Seek(-1, os.SEEK_END)
	last := make([]byte, 1, 1)
	n, err := f.Read(last)
	if err != nil && err != io.EOF {
		return err
	}

	if err == nil && n > 0 {
		if last[0] != 10 {
			f.Write([]byte{10})
		}
	}

	for _, e := range l.Entries {
		by, err := e.MarshalText()
		if err != nil {
			continue
		}
		f.Write(by)
		f.Write([]byte{10})
	}

	return nil
}