# processors/validator.py

import os
import zipfile
import rarfile


class ValidationResult:
    def __init__(self, path):
        self.path = path
        self.real_format = None     # "zip", "rar", None
        self.extension = None       # ".cbz" o ".cbr"
        self.errors = []
        self.warnings = []

    def __str__(self):
        msg = f"Validación de: {self.path}\n"
        msg += f"  Formato real: {self.real_format}\n"
        msg += f"  Extensión: {self.extension}\n"
        if self.errors:
            msg += "  Errores:\n"
            for e in self.errors:
                msg += f"    - {e}\n"
        if self.warnings:
            msg += "  Avisos:\n"
            for w in self.warnings:
                msg += f"    - {w}\n"
        return msg


def detect_real_format(path):
    """Devuelve 'zip', 'rar' o None."""
    try:
        zipfile.ZipFile(path).close()
        return "zip"
    except:
        pass

    try:
        rarfile.RarFile(path).close()
        return "rar"
    except:
        pass

    return None


def validate_comic(path):
    result = ValidationResult(path)
    ext = os.path.splitext(path)[1].lower()
    result.extension = ext

    real = detect_real_format(path)
    result.real_format = real

    if real is None:
        result.errors.append("Archivo corrupto o ilegible")
        return result

    if ext == ".cbz" and real == "rar":
        result.warnings.append("Extensión incorrecta: debería ser .cbr")

    if ext == ".cbr" and real == "zip":
        result.warnings.append("Extensión incorrecta: debería ser .cbz")

    return result