"""Tests para http_download_file."""

import sys
import tempfile
import os
import unittest
from unittest.mock import MagicMock, patch

sys.path.insert(0, "/home/lucas/fn_registry/python/functions")

from infra.http_download_file import http_download_file


def _make_response(content: bytes, content_type: str = "application/octet-stream"):
    resp = MagicMock()
    # Simula lectura en chunks
    chunks = [content[i:i+8192] for i in range(0, len(content), 8192)] + [b""]
    resp.read.side_effect = chunks
    resp.headers = {"Content-Type": content_type}
    resp.__enter__ = lambda s: s
    resp.__exit__ = MagicMock(return_value=False)
    return resp


class TestHttpDownloadFile(unittest.TestCase):

    def test_mock_descarga_con_contenido_binario(self):
        content = b"\x00\x01\x02\x03" * 100
        mock_resp = _make_response(content, "application/octet-stream")

        with tempfile.TemporaryDirectory() as tmpdir:
            dest = os.path.join(tmpdir, "file.bin")
            with patch("urllib.request.urlopen", return_value=mock_resp):
                result = http_download_file("http://example.com/file.bin", dest)

            self.assertEqual(result["size_bytes"], len(content))
            self.assertEqual(result["path"], dest)
            with open(dest, "rb") as f:
                self.assertEqual(f.read(), content)

    def test_directorio_destino_creado_automaticamente(self):
        content = b"hello binary"
        mock_resp = _make_response(content)

        with tempfile.TemporaryDirectory() as tmpdir:
            dest = os.path.join(tmpdir, "nested", "deep", "file.bin")
            self.assertFalse(os.path.exists(os.path.dirname(dest)))

            with patch("urllib.request.urlopen", return_value=mock_resp):
                http_download_file("http://example.com/file.bin", dest)

            self.assertTrue(os.path.exists(dest))

    def test_retorno_con_size_correcto(self):
        content = b"x" * 5000
        mock_resp = _make_response(content, "text/plain")

        with tempfile.TemporaryDirectory() as tmpdir:
            dest = os.path.join(tmpdir, "out.txt")
            with patch("urllib.request.urlopen", return_value=mock_resp):
                result = http_download_file("http://example.com/data.txt", dest)

            self.assertEqual(result["size_bytes"], 5000)
            self.assertEqual(result["content_type"], "text/plain")

    def test_timeout_configurado_en_el_request(self):
        content = b"data"
        mock_resp = _make_response(content)
        captured_timeout = []

        def fake_urlopen(req, timeout=None):
            captured_timeout.append(timeout)
            return mock_resp

        with tempfile.TemporaryDirectory() as tmpdir:
            dest = os.path.join(tmpdir, "file.bin")
            with patch("urllib.request.urlopen", side_effect=fake_urlopen):
                http_download_file("http://example.com/file.bin", dest, timeout=60.0)

        self.assertEqual(captured_timeout[0], 60.0)


if __name__ == "__main__":
    unittest.main()