From ad614d09b4378496834ec9d1c7b4dacbc4152530 Mon Sep 17 00:00:00 2001
From: celogeek <65178+celogeek@users.noreply.github.com>
Date: Sun, 16 Feb 2025 12:50:25 +0100
Subject: [PATCH] passthrough, support for dir

---
 .../pkg/epubimageprocessor/passthrough.go     | 175 +++++++++++++++++-
 1 file changed, 172 insertions(+), 3 deletions(-)

diff --git a/internal/pkg/epubimageprocessor/passthrough.go b/internal/pkg/epubimageprocessor/passthrough.go
index 672769a..21aea68 100644
--- a/internal/pkg/epubimageprocessor/passthrough.go
+++ b/internal/pkg/epubimageprocessor/passthrough.go
@@ -1,8 +1,177 @@
 package epubimageprocessor
 
-import "github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"image/jpeg"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubimage"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubprogress"
+	"github.com/celogeek/go-comic-converter/v3/internal/pkg/epubzip"
+)
 
 func (e EPUBImageProcessor) PassThrough() (images []epubimage.EPUBImage, err error) {
-	images = make([]epubimage.EPUBImage, 0)
-	return images, nil
+	fi, err := os.Stat(e.Input)
+	if err != nil {
+		return
+	}
+
+	if fi.IsDir() {
+		return e.passThroughDir()
+	} else {
+		switch ext := strings.ToLower(filepath.Ext(e.Input)); ext {
+		case ".cbz", ".zip":
+			return e.passThroughCbz()
+		case ".cbr", ".rar":
+			return e.passThroughCbr()
+		default:
+			return nil, fmt.Errorf("unknown file format (%s): support .cbz, .zip, .cbr, .rar", ext)
+		}
+	}
+
+}
+
+func (e EPUBImageProcessor) passThroughDir() (images []epubimage.EPUBImage, err error) {
+	imagesPath := make([]string, 0)
+
+	input := filepath.Clean(e.Input)
+	err = filepath.WalkDir(input, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+
+		// skip hidden files
+		if strings.HasPrefix(filepath.Base(path), ".") {
+			return nil
+		}
+
+		if d.IsDir() {
+			return nil
+		}
+
+		if slices.Contains([]string{".jpeg", ".jpg"}, strings.ToLower(filepath.Ext(path))) {
+			imagesPath = append(imagesPath, path)
+		}
+		return nil
+	})
+
+	if err != nil {
+		return
+	}
+
+	if len(imagesPath) == 0 {
+		err = errNoImagesFound
+		return
+	}
+
+	var imgStorage epubzip.StorageImageWriter
+	imgStorage, err = epubzip.NewStorageImageWriter(e.ImgStorage(), e.Image.Format)
+	if err != nil {
+		return
+	}
+
+	// processing
+	bar := epubprogress.New(epubprogress.Options{
+		Quiet:       e.Quiet,
+		Json:        e.Json,
+		Max:         len(imagesPath),
+		Description: "Copying",
+		CurrentJob:  1,
+		TotalJob:    2,
+	})
+
+	for i, imgPath := range imagesPath {
+		var f *os.File
+		f, err = os.Open(imgPath)
+		if err != nil {
+			return
+		}
+
+		var uncompressedData []byte
+		uncompressedData, err = io.ReadAll(f)
+		if err != nil {
+			return
+		}
+
+		err = f.Close()
+		if err != nil {
+			return
+		}
+
+		var config image.Config
+		config, err = jpeg.DecodeConfig(bytes.NewReader(uncompressedData))
+		if err != nil {
+			return
+		}
+
+		var rawImage image.Image
+		if i == 0 {
+			rawImage, err = jpeg.Decode(bytes.NewReader(uncompressedData))
+			if err != nil {
+				return
+			}
+		}
+
+		p, fn := filepath.Split(imgPath)
+		if p == input {
+			p = ""
+		} else {
+			p = p[len(input)+1:]
+		}
+
+		img := epubimage.EPUBImage{
+			Id:                  i,
+			Part:                0,
+			Raw:                 rawImage,
+			Width:               config.Width,
+			Height:              config.Height,
+			IsBlank:             false,
+			DoublePage:          config.Width > config.Height,
+			Path:                p,
+			Name:                fn,
+			Format:              "jpeg",
+			OriginalAspectRatio: float64(config.Height) / float64(config.Width),
+		}
+
+		err = imgStorage.AddRaw(img.EPUBImgPath(), uncompressedData)
+		if err != nil {
+			return
+		}
+
+		images = append(images, img)
+		_ = bar.Add(1)
+	}
+
+	err = imgStorage.Close()
+	if err != nil {
+		return
+	}
+
+	_ = bar.Close()
+
+	if len(images) == 0 {
+		err = errNoImagesFound
+	}
+
+	return
+
+}
+
+func (e EPUBImageProcessor) passThroughCbz() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+	err = errNoImagesFound
+	return
+}
+
+func (e EPUBImageProcessor) passThroughCbr() (images []epubimage.EPUBImage, err error) {
+	images = make([]epubimage.EPUBImage, 0)
+	err = errNoImagesFound
+	return
 }