package evelogs

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"os/user"
	"path/filepath"
	"strings"
)

type LogDir struct {
	Path string
}

func NewLogDir(path string) (*LogDir, error) {
	// do a unix like expansion if the path starts like `~/`
	if strings.HasPrefix(path, "~/") {
		userName, _ := user.Current()
		path = filepath.Join(userName.HomeDir, path[2:])
	}
	ld := &LogDir{Path: path}
	if !ld.DExists() {
		return nil, fmt.Errorf("Path %s does not exist or is a regular file", ld.Path)
	}
	return ld, nil
}

func (ld *LogDir) DExists() bool {
	info, err := os.Stat(ld.Path)
	if os.IsNotExist(err) {
		return false
	}
	return info.IsDir()
}

func (ld *LogDir) GetLogFiles() ([]*LogFile, error) {
	//TODO: iterate through the directory looking for logs

	files, err := ioutil.ReadDir(ld.Path)
	var paths []string
	if err != nil {
		log.Fatal(err)
		return nil, err
	}
	for _, f := range files {
		if !f.IsDir() {
			paths = append(paths, ld.Path+string(os.PathSeparator)+f.Name())
		}
	}
	logfiles, err := PathsToLogFiles(paths)
	if err != nil {
		log.Fatal(err)
		return nil, err
	}
	return logfiles, nil
}

// Generate logDir instances from log dir paths
func DirsToLogDirs(paths []string) ([]*LogDir, error) {
	var logDirs []*LogDir
	for _, dirpath := range paths {
		newLogDir, err := NewLogDir(dirpath)
		if err != nil {
			return nil, err
		}
		logDirs = append(logDirs, newLogDir)
	}
	return logDirs, nil
}