import importlib
import types

import pytest

from models.model import Message


@pytest.fixture(autouse=True)
def patch_file_helpers(monkeypatch: pytest.MonkeyPatch):
    """
    Patch file_helpers.get_signed_file_url to a deterministic stub.
    """
    model_module = importlib.import_module("models.model")
    dummy = types.SimpleNamespace(get_signed_file_url=lambda fid: f"https://signed.example/{fid}")
    # Inject/override file_helpers on models.model
    monkeypatch.setattr(model_module, "file_helpers", dummy, raising=False)


def _wrap_md(url: str) -> str:
    """
    Wrap a raw URL into the markdown that re_sign_file_url_answer expects:
    [link](<url>)
    """
    return f"please click [file]({url}) to download."


def test_file_preview_valid_replaced():
    """
    Valid file-preview URL must be re-signed:
    - Extract upload_file_id correctly
    - Replace the original URL with the signed URL
    """
    upload_id = "abc-123"
    url = f"/files/{upload_id}/file-preview?timestamp=111&nonce=222&sign=333"
    msg = Message(answer=_wrap_md(url))

    out = msg.re_sign_file_url_answer
    assert f"https://signed.example/{upload_id}" in out
    assert url not in out


def test_file_preview_misspelled_not_replaced():
    """
    Misspelled endpoint 'file-previe?timestamp=' should NOT be rewritten.
    """
    upload_id = "zzz-001"
    # path deliberately misspelled: file-previe? (missing 'w')
    # and we append &note=file-preview to trick the old `"file-preview" in url` check.
    url = f"/files/{upload_id}/file-previe?timestamp=111&nonce=222&sign=333&note=file-preview"
    original = _wrap_md(url)
    msg = Message(answer=original)

    out = msg.re_sign_file_url_answer
    # Expect NO replacement, should not rewrite misspelled file-previe URL
    assert out == original


def test_image_preview_valid_replaced():
    """
    Valid image-preview URL must be re-signed.
    """
    upload_id = "img-789"
    url = f"/files/{upload_id}/image-preview?timestamp=123&nonce=456&sign=789"
    msg = Message(answer=_wrap_md(url))

    out = msg.re_sign_file_url_answer
    assert f"https://signed.example/{upload_id}" in out
    assert url not in out


def test_image_preview_misspelled_not_replaced():
    """
    Misspelled endpoint 'image-previe?timestamp=' should NOT be rewritten.
    """
    upload_id = "img-err-42"
    url = f"/files/{upload_id}/image-previe?timestamp=1&nonce=2&sign=3&note=image-preview"
    original = _wrap_md(url)
    msg = Message(answer=original)

    out = msg.re_sign_file_url_answer
    # Expect NO replacement, should not rewrite misspelled image-previe URL
    assert out == original