"""Tests for the GitHub API client."""

import httpx
import pytest
import respx

from src.github import GitHubClient, AuthenticationError, NotFoundError


@pytest.fixture
def mock_api():
    """Enable respx mocking for test scope."""
    with respx.mock:
        yield respx


class TestFetchReleases:
    def test_fetch_releases(self, mock_api):
        mock_api.get("https://api.github.com/repos/owner/repo/releases").mock(
            return_value=httpx.Response(200, json=[
                {
                    "tag_name": "v1.0.0",
                    "name": "Release v1.0.0",
                    "body": "# Changelog\n\n- Fixed bug",
                    "published_at": "2025-01-15T10:30:00Z",
                    "html_url": "https://github.com/owner/repo/releases/tag/v1.0.0",
                },
                {
                    "tag_name": "v0.9.0",
                    "name": None,
                    "body": "",
                    "published_at": "2025-01-10T08:00:00Z",
                    "html_url": "https://github.com/owner/repo/releases/tag/v0.9.0",
                },
            ])
        )

        client = GitHubClient(token="fake_token")
        releases = client.fetch_releases("owner/repo")
        client.close()

        assert len(releases) == 2
        assert releases[0]["tag_name"] == "v1.0.0"
        assert releases[0]["title"] == "Release v1.0.0"
        assert releases[0]["body"] == "# Changelog\n\n- Fixed bug"
        assert releases[1]["title"] == "v0.9.0"
        assert releases[1]["body"] == ""

    def test_fetch_releases_404(self, mock_api):
        mock_api.get("https://api.github.com/repos/no/such/releases").mock(
            return_value=httpx.Response(404)
        )

        client = GitHubClient(token="fake_token")
        with pytest.raises(NotFoundError):
            client.fetch_releases("no/such")
        client.close()


class TestFetchTags:
    def test_fetch_tags(self, mock_api):
        mock_api.get("https://api.github.com/repos/owner/repo/tags").mock(
            return_value=httpx.Response(200, json=[
                {"name": "v1.0.0", "commit": {"sha": "aaa111"}},
                {"name": "v0.9.0", "commit": {"sha": "bbb222"}},
            ])
        )
        mock_api.get("https://api.github.com/repos/owner/repo/commits/aaa111").mock(
            return_value=httpx.Response(200, json={
                "commit": {"author": {"date": "2025-01-15T10:30:00Z"}}
            })
        )
        mock_api.get("https://api.github.com/repos/owner/repo/commits/bbb222").mock(
            return_value=httpx.Response(200, json={
                "commit": {"author": {"date": "2025-01-10T08:00:00Z"}}
            })
        )

        client = GitHubClient(token="fake_token")
        tags = client.fetch_tags("owner/repo")
        client.close()

        assert len(tags) == 2
        assert tags[0]["tag_name"] == "v1.0.0"
        assert tags[0]["title"] == "v1.0.0"
        assert tags[0]["body"] == ""
        assert tags[0]["published_at"] == "2025-01-15T10:30:00Z"
        assert tags[0]["html_url"] == "https://github.com/owner/repo/releases/tag/v1.0.0"

    def test_fetch_tags_with_tag_object(self, mock_api):
        """Commit date is fetched directly from commit SHA in tags API."""
        mock_api.get("https://api.github.com/repos/owner/repo/tags").mock(
            return_value=httpx.Response(200, json=[
                {"name": "v2.0.0", "commit": {"sha": "abc123"}},
            ])
        )
        mock_api.get("https://api.github.com/repos/owner/repo/commits/abc123").mock(
            return_value=httpx.Response(200, json={
                "commit": {"author": {"date": "2025-02-01T12:00:00Z"}}
            })
        )

        client = GitHubClient(token="fake_token")
        tags = client.fetch_tags("owner/repo")
        client.close()

        assert tags[0]["published_at"] == "2025-02-01T12:00:00Z"

    def test_fetch_tags_fallback_date(self, mock_api):
        """When commit API fails, use current time as fallback."""
        mock_api.get("https://api.github.com/repos/owner/repo/tags").mock(
            return_value=httpx.Response(200, json=[
                {"name": "v1.0.0", "commit": {"sha": "xyz789"}},
            ])
        )
        mock_api.get("https://api.github.com/repos/owner/repo/commits/xyz789").mock(
            return_value=httpx.Response(404)
        )

        client = GitHubClient(token="fake_token")
        tags = client.fetch_tags("owner/repo")
        client.close()

        assert tags[0]["published_at"] is not None


class TestRepoExists:
    def test_repo_exists_true(self, mock_api):
        mock_api.get("https://api.github.com/repos/owner/repo").mock(
            return_value=httpx.Response(200, json={"full_name": "owner/repo"})
        )
        client = GitHubClient(token="fake_token")
        assert client.repo_exists("owner/repo") is True
        client.close()

    def test_repo_exists_false(self, mock_api):
        mock_api.get("https://api.github.com/repos/no/such").mock(
            return_value=httpx.Response(404)
        )
        client = GitHubClient(token="fake_token")
        assert client.repo_exists("no/such") is False
        client.close()


class TestAuthentication:
    def test_invalid_token(self, mock_api):
        mock_api.get("https://api.github.com/rate_limit").mock(
            return_value=httpx.Response(401)
        )
        client = GitHubClient(token="bad_token")
        with pytest.raises(AuthenticationError, match="401 Unauthorized"):
            client.validate_token()
        client.close()

    def test_no_token_skips_validation(self):
        client = GitHubClient(token=None)
        client.validate_token()
        client.close()