# processors/converter.py

import os
import zipfile
import rarfile
import tempfile
import shutil

from processors.validator import validate_comic


def convert_comic(path, desired_format="cbz"):
    validation = validate_comic(path)

    if validation.errors:
        raise Exception(f"Archivo corrupto: {path}")

    real = validation.real_format

    # Si ya está en el formato deseado → nada que hacer
    if desired_format == "cbz" and real == "zip":
        return {"needs_conversion": False, "target_path": path}

    if desired_format == "cbr" and real == "rar":
        return {"needs_conversion": False, "target_path": path}

    # Abrir según formato real
    archive = zipfile.ZipFile(path, "r") if real == "zip" else rarfile.RarFile(path, "r")

    temp_dir = tempfile.mkdtemp()
    archive.extractall(temp_dir)
    archive.close()

    base, _ = os.path.splitext(path)
    target_path = f"{base}.{desired_format}"

    if desired_format == "cbz":
        with zipfile.ZipFile(target_path, "w", zipfile.ZIP_DEFLATED) as new_zip:
            for root, _, files in os.walk(temp_dir):
                for f in files:
                    full = os.path.join(root, f)
                    rel = os.path.relpath(full, temp_dir)
                    new_zip.write(full, rel)

    elif desired_format == "cbr":
        raise NotImplementedError("Crear CBR requiere 'rar' instalado")

    shutil.rmtree(temp_dir)

    # Mover original a backup
    from core.backup import move_to_backup
    move_to_backup(path)

    return {"needs_conversion": True, "target_path": target_path}