package archiver

import (
	"github.com/sirupsen/logrus"
	"os"
	"path/filepath"
	"strings"
	"time"
)

const _YEARMONTHONLY = "200601"

const ArchiveFolder = "archive"
const ErrorFolder = "error"

var logger = logrus.WithField("package", "archiver")

func NewFileArchiver(conf *Config) func(string, error) {
	return func(f string, archiveErr error) {
		var err error = nil
		if archiveErr != nil {
			err = moveToError(conf, f, archiveErr)
		} else {
			err = moveToArchive(conf, f)
		}

		if err != nil {
			logger.Error(err)
		}
	}
}

func extractGlobbedDir(rootPath string, filePath string) string {
	if !strings.Contains(rootPath, "*") {
		return ""
	}
	fileDir := filepath.Dir(filePath)
	globRoot := getGlobRoot(rootPath)
	globbedDir, err := filepath.Rel(globRoot, fileDir)
	if err != nil {
		logger.
			WithField("rootPath", rootPath).
			WithField("globRoot", globRoot).
			WithField("fileDir", fileDir).
			Error(err)
		return ""
	}
	return globbedDir
}
func getDestFolder(conf *Config, archiveFolder string) string {
	var destFolder string
	if len(conf.ArchiveFolder) > 0 {
		destFolder = filepath.Join(conf.ArchiveFolder)
	} else {
		destFolder = filepath.Join(conf.Folder)
		destFolder = getGlobRoot(destFolder)
	}
	return filepath.Join(destFolder, archiveFolder)
}

func moveToArchive(conf *Config, filePath string) error {
	baseName := filepath.Base(filePath)
	dateString := time.Now().Format(_YEARMONTHONLY)

	destFolder := getDestFolder(conf, ArchiveFolder)
	globDir := extractGlobbedDir(conf.Folder, filePath)
	if globDir != "" {
		destFolder = filepath.Join(destFolder, globDir)
	}

	destFolder = filepath.Join(destFolder, dateString)

	err := os.MkdirAll(destFolder, os.ModePerm)
	if err != nil {
		return err
	}
	err = os.Rename(filePath, filepath.Join(destFolder, baseName))
	if err != nil {
		return err
	}
	return nil
}

func moveToError(conf *Config, filePath string, archiveErr error) error {
	baseName := filepath.Base(filePath)

	destFolder := getDestFolder(conf, ErrorFolder)
	globDir := extractGlobbedDir(conf.Folder, filePath)
	if globDir != "" {
		destFolder = filepath.Join(destFolder, globDir)
	}

	err := os.MkdirAll(destFolder, os.ModePerm)
	if err != nil {
		return err
	}
	err = os.Rename(filePath, filepath.Join(destFolder, baseName))
	err = writeErrorFile(conf, filePath, archiveErr)
	if err != nil {
		return err
	}
	return nil
}