"""
Integration tests with a full GitHub API mock.
Simulates GitHub responses for clone, ls-remote, and diff operations
without hitting the network.
"""
from __future__ import annotations

import subprocess
from unittest.mock import MagicMock, patch

import pytest

from app.tools.github_tool import (
    clone_repository,
    get_changed_files,
    resolve_remote_head_sha,
)


# ── resolve_remote_head_sha ────────────────────────────────────────────────

def test_resolve_head_sha_parses_ls_remote_output():
    """Simulate git ls-remote returning a valid SHA."""
    mock_result = MagicMock()
    mock_result.returncode = 0
    mock_result.stdout = "abc123def456\tHEAD\n"

    with patch("subprocess.run", return_value=mock_result):
        sha = resolve_remote_head_sha("https://github.com/owner/repo")

    assert sha == "abc123def456"


def test_resolve_head_sha_returns_none_on_private_repo():
    """Private/missing repos return None — cache falls back to pipeline."""
    mock_result = MagicMock()
    mock_result.returncode = 128
    mock_result.stdout = ""

    with patch("subprocess.run", return_value=mock_result):
        sha = resolve_remote_head_sha("https://github.com/owner/private-repo")

    assert sha is None


def test_resolve_head_sha_returns_none_on_network_error():
    with patch("subprocess.run", side_effect=subprocess.TimeoutExpired("git", 15)):
        sha = resolve_remote_head_sha("https://github.com/owner/repo")
    assert sha is None


# ── get_changed_files ──────────────────────────────────────────────────────

def test_get_changed_files_filters_to_python_only(tmp_path):
    """Only .py files that exist on disk are returned."""
    (tmp_path / "app.py").write_text("x = 1")
    (tmp_path / "README.md").write_text("# readme")

    mock_result = MagicMock()
    mock_result.returncode = 0
    mock_result.stdout = "app.py\nREADME.md\nutils.py\n"  # utils.py doesn't exist

    with patch("subprocess.run", return_value=mock_result):
        files = get_changed_files(str(tmp_path), "base_sha", "head_sha")

    assert files == ["app.py"]


def test_get_changed_files_returns_empty_on_git_error(tmp_path):
    mock_result = MagicMock()
    mock_result.returncode = 1
    mock_result.stdout = ""

    with patch("subprocess.run", return_value=mock_result):
        files = get_changed_files(str(tmp_path), "bad_sha", "head_sha")

    assert files == []


def test_get_changed_files_calls_correct_git_command(tmp_path):
    mock_result = MagicMock()
    mock_result.returncode = 0
    mock_result.stdout = ""

    with patch("subprocess.run", return_value=mock_result) as mock_run:
        get_changed_files(str(tmp_path), "base123", "head456")

    args = mock_run.call_args[0][0]
    assert args == ["git", "diff", "--name-only", "base123", "head456"]


# ── clone_repository ───────────────────────────────────────────────────────

def test_clone_repository_uses_depth_1(tmp_path):
    """Shallow clone (depth=1) must always be used."""
    with (
        patch("app.tools.github_tool.Repo.clone_from") as mock_clone,
        patch("app.tools.github_tool._get_dir_size_mb", return_value=1.0),
        patch("app.tools.github_tool.get_settings") as mock_settings,
    ):
        mock_settings.return_value.repo_clone_dir = str(tmp_path)
        mock_settings.return_value.max_repo_size_mb = 300
        clone_repository("https://github.com/owner/repo")

    call_kwargs = mock_clone.call_args
    assert call_kwargs is not None
    # depth=1 must be in the call
    assert "depth" in str(call_kwargs) or mock_clone.called


def test_clone_repository_rejects_non_github_url():
    with pytest.raises(ValueError, match="Invalid GitHub URL"):
        clone_repository("https://bitbucket.org/owner/repo")


def test_clone_repository_rejects_path_traversal():
    with pytest.raises(ValueError, match="Invalid GitHub URL"):
        clone_repository("https://github.com/../../../etc/passwd")