1 files changed, 30 insertions, 0 deletions
diff --git a/internal/comic/pdf.go b/internal/comic/pdf.go
new file mode 100644
index 0000000..23a7e11
--- /dev/null
+++ b/internal/comic/pdf.go
@@ -0,0 +1,30 @@
+package comic
+
+import (
+	"fmt"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+// AssembleComicPDF combines comic pages into a PDF using ImageMagick.
+func AssembleComicPDF(outputDir, titleSlug string, imagePaths []string) (string, error) {
+	if len(imagePaths) == 0 {
+		return "", fmt.Errorf("no comic images to assemble into PDF")
+	}
+	if _, err := exec.LookPath("convert"); err != nil {
+		return "", fmt.Errorf("ImageMagick 'convert' not found — install ImageMagick to generate the PDF")
+	}
+
+	pdfPath := filepath.Join(outputDir, titleSlug+".pdf")
+	args := []string{"-density", "150"}
+	args = append(args, imagePaths...)
+	args = append(args, pdfPath)
+
+	cmd := exec.Command("convert", args...)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return "", fmt.Errorf("convert failed: %w\n%s", err, strings.TrimSpace(string(out)))
+	}
+	return pdfPath, nil
+}