package files

import (
	"io/fs"
	"path/filepath"
	"strconv"
	"strings"
	"time"
	"velvettear/dedupe/log"
	"velvettear/dedupe/settings"
)

var Duplicates []string

var sourceFiles []string
var comparisonFiles []string

// exported function(s)
func Scan() {
	timestamp := time.Now()
	log.Info("scanning source directory...", settings.SourceDirectory)
	filepath.WalkDir(settings.SourceDirectory, fillSourceFiles)
	log.InfoTimed("found "+strconv.Itoa(len(sourceFiles))+" source files", timestamp.UnixMilli())

	timestamp = time.Now()
	log.Info("scanning comparison directory...", settings.SourceDirectory)
	filepath.WalkDir(settings.ComparisonDirectory, fillComparisonFiles)
	log.InfoTimed("found "+strconv.Itoa(len(comparisonFiles))+" comparison files", timestamp.UnixMilli())

	timestamp = time.Now()
	log.Info("comparing files...")
	for _, sourceFile := range sourceFiles {
		log.Debug("checking file", sourceFile)
		sourceFilePath := strings.Replace(strings.Replace(sourceFile, filepath.Ext(sourceFile), "", 1), settings.SourceDirectory, "", 1)
		for _, comparisonFile := range comparisonFiles {
			comparisonFilePath := strings.Replace(strings.Replace(comparisonFile, filepath.Ext(comparisonFile), "", 1), settings.ComparisonDirectory, "", 1)
			if comparisonFilePath != sourceFilePath {
				continue
			}
			log.Debug("duplicate file found", sourceFile+" -> "+comparisonFile)
			Duplicates = append(Duplicates, comparisonFile)
		}
	}
	log.InfoTimed("found "+strconv.Itoa(len(Duplicates))+" duplicate files", timestamp.Local().UnixMilli())
}

// unexported function(s)
func fillSourceFiles(path string, dir fs.DirEntry, err error) error {
	if err != nil {
		return err
	}
	if dir.IsDir() {
		return nil
	}
	sourceFiles = append(sourceFiles, path)
	return nil
}

func fillComparisonFiles(path string, dir fs.DirEntry, err error) error {
	if err != nil {
		return err
	}
	if dir.IsDir() {
		return nil
	}
	comparisonFiles = append(comparisonFiles, path)
	return nil
}