from __future__ import annotations

import tempfile
from pathlib import Path

from bot_descarga.config.settings import Settings
from bot_descarga.infrastructure.pdf_validator import PdfValidator


def test_validate_rechaza_archivo_pequeno():
    settings = Settings(peso_minimo_bytes=10_000)
    validator = PdfValidator(settings)

    with tempfile.TemporaryDirectory() as tmp:
        path = Path(tmp) / "tiny.pdf"
        path.write_bytes(b"%PDF-1.4\n%%EOF\n")
        ok, motivo = validator.validate(str(path))

    assert ok is False
    assert "Peso insuficiente" in motivo


def test_validate_rechaza_sin_firma_pdf():
    settings = Settings(peso_minimo_bytes=10)
    validator = PdfValidator(settings)

    with tempfile.TemporaryDirectory() as tmp:
        path = Path(tmp) / "fake.pdf"
        path.write_bytes(b"NOTA PDF" + b"x" * 100)
        ok, motivo = validator.validate(str(path))

    assert ok is False
    assert "firma" in motivo.lower()


def test_validate_acepta_pdf_minimo_valido():
    """PDF mínimo con firma, EOF y estructura pikepdf-compatible."""
    import pikepdf

    settings = Settings(peso_minimo_bytes=50)
    validator = PdfValidator(settings)

    with tempfile.TemporaryDirectory() as tmp:
        path = Path(tmp) / "ok.pdf"
        pdf = pikepdf.Pdf.new()
        # Varias páginas para superar el peso mínimo sin corromper el archivo
        for _ in range(5):
            pdf.add_blank_page(page_size=(612, 792))
        pdf.save(path)

        ok, motivo = validator.validate(str(path))

    assert ok is True, motivo
    assert motivo == "OK"