"""Tests for devx.ci.fix_pr_title."""

from __future__ import annotations

from unittest.mock import MagicMock, patch

import pytest
from click.testing import CliRunner

from devx.ci.fix_pr_title import cli


@pytest.fixture(autouse=True)
def _obl_infra_prefix(monkeypatch: pytest.MonkeyPatch) -> None:
    """Use OBL-INFRA prefix to match infra repo conventions."""
    import re

    monkeypatch.setattr("devx.ci.fix_pr_title.TASK_PREFIX", "OBL-INFRA")
    monkeypatch.setattr("devx.ci.auto_merge.TASK_PREFIX", "OBL-INFRA")
    monkeypatch.setattr("devx.ci.auto_merge.PR_TITLE_RE", re.compile(r"^OBL-INFRA-\d+:\s+.+"))
    monkeypatch.setattr("devx.ci.auto_merge._TASK_ID_PREFIX_RE", re.compile(r"^OBL-INFRA-\d+:\s*"))
    monkeypatch.setattr("devx.ci._shared.TASK_ID_RE", re.compile(r"OBL-INFRA-\d+"))


class TestFixPrTitle:
    @patch("devx.ci.fix_pr_title.get_ci_token")
    @patch("devx.ci.fix_pr_title.GiteaClient")
    @patch("devx.ci.fix_pr_title.get_vikunja_title_optional")
    def test_fixes_title_with_vikunja(
        self,
        mock_vikunja: MagicMock,
        mock_gitea_cls: MagicMock,
        mock_ci_token: MagicMock,
    ) -> None:
        """PR title is updated to match task ID + Vikunja title."""
        mock_client = MagicMock()
        mock_gitea_cls.return_value = mock_client
        mock_client.get_pr.return_value = {
            "number": 42,
            "title": "Fix blackbox exporter",
            "head": {"ref": "OBL-INFRA-458-blackbox-ipv4"},
        }
        mock_vikunja.return_value = "Fix blackbox exporter IPv4 config"
        mock_ci_token.return_value = "token"

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "42"])

        assert result.exit_code == 0
        mock_client.update_pr.assert_called_once_with(42, {"title": "OBL-INFRA-458: Fix blackbox exporter IPv4 config"})

    @patch("devx.ci.fix_pr_title.get_ci_token")
    @patch("devx.ci.fix_pr_title.GiteaClient")
    @patch("devx.ci.fix_pr_title.get_vikunja_title_optional")
    def test_strips_conventional_commit_prefix_when_no_vikunja(
        self,
        mock_vikunja: MagicMock,
        mock_gitea_cls: MagicMock,
        mock_ci_token: MagicMock,
    ) -> None:
        """When Vikunja task not found, strips conventional-commit prefix from current title."""
        mock_client = MagicMock()
        mock_gitea_cls.return_value = mock_client
        mock_client.get_pr.return_value = {
            "number": 10,
            "title": "fix: platform self-monitoring and fixes",
            "head": {"ref": "OBL-INFRA-456-platform-fixes"},
        }
        mock_vikunja.return_value = None
        mock_ci_token.return_value = "token"

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "10"])

        assert result.exit_code == 0
        mock_client.update_pr.assert_called_once_with(
            10, {"title": "OBL-INFRA-456: platform self-monitoring and fixes"}
        )

    @patch("devx.ci.fix_pr_title.get_ci_token")
    @patch("devx.ci.fix_pr_title.GiteaClient")
    @patch("devx.ci.fix_pr_title.get_vikunja_title_optional")
    def test_already_correct_title_no_update(
        self,
        mock_vikunja: MagicMock,
        mock_gitea_cls: MagicMock,
        mock_ci_token: MagicMock,
    ) -> None:
        """When PR title is already correct, no update is made."""
        mock_client = MagicMock()
        mock_gitea_cls.return_value = mock_client
        mock_client.get_pr.return_value = {
            "number": 5,
            "title": "OBL-INFRA-100: Fix bug",
            "head": {"ref": "OBL-INFRA-100-fix-bug"},
        }
        mock_vikunja.return_value = "Fix bug"
        mock_ci_token.return_value = "token"

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "5"])

        assert result.exit_code == 0
        mock_client.update_pr.assert_not_called()

    @patch("devx.ci.fix_pr_title.get_ci_token")
    @patch("devx.ci.fix_pr_title.GiteaClient")
    @patch("devx.ci.fix_pr_title.get_vikunja_title_optional")
    def test_dry_run_no_update(
        self,
        mock_vikunja: MagicMock,
        mock_gitea_cls: MagicMock,
        mock_ci_token: MagicMock,
    ) -> None:
        """Dry run shows what would change without updating."""
        mock_client = MagicMock()
        mock_gitea_cls.return_value = mock_client
        mock_client.get_pr.return_value = {
            "number": 7,
            "title": "Fix thing",
            "head": {"ref": "OBL-INFRA-7-fix-thing"},
        }
        mock_vikunja.return_value = "Fix thing"
        mock_ci_token.return_value = "token"

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "7", "--dry-run"])

        assert result.exit_code == 0
        mock_client.update_pr.assert_not_called()

    @patch("devx.ci.fix_pr_title.get_ci_token")
    @patch("devx.ci.fix_pr_title.GiteaClient")
    def test_no_task_id_in_branch_exits_error(
        self,
        mock_gitea_cls: MagicMock,
        mock_ci_token: MagicMock,
    ) -> None:
        """When branch has no task ID, exits with error."""
        mock_client = MagicMock()
        mock_gitea_cls.return_value = mock_client
        mock_client.get_pr.return_value = {
            "number": 1,
            "title": "Some title",
            "head": {"ref": "just-a-branch"},
        }
        mock_ci_token.return_value = "token"

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "1"])

        assert result.exit_code != 0
        mock_client.update_pr.assert_not_called()

    @patch("devx.ci.fix_pr_title.get_ci_token")
    def test_no_token_exits_error(self, mock_ci_token: MagicMock) -> None:
        """When CI token is not set, exits with error."""
        mock_ci_token.side_effect = Exception("no token")

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "1"])

        assert result.exit_code != 0

    @patch("devx.ci.fix_pr_title.get_ci_token")
    @patch("devx.ci.fix_pr_title.GiteaClient")
    @patch("devx.ci.fix_pr_title.get_vikunja_title_optional")
    def test_strips_task_id_prefix_from_vikunja_title(
        self,
        mock_vikunja: MagicMock,
        mock_gitea_cls: MagicMock,
        mock_ci_token: MagicMock,
    ) -> None:
        """When Vikunja title already has task ID prefix, it's stripped to avoid double prefix."""
        mock_client = MagicMock()
        mock_gitea_cls.return_value = mock_client
        mock_client.get_pr.return_value = {
            "number": 99,
            "title": "Fix thing",
            "head": {"ref": "OBL-INFRA-99-fix-thing"},
        }
        mock_vikunja.return_value = "OBL-INFRA-99: Fix thing"
        mock_ci_token.return_value = "token"

        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "oblachno/infra", "--pr-number", "99"])

        assert result.exit_code == 0
        mock_client.update_pr.assert_called_once_with(99, {"title": "OBL-INFRA-99: Fix thing"})

    def test_invalid_repo_format_exits_error(self) -> None:
        """When repo is not in owner/name format, exits with error."""
        runner = CliRunner()
        result = runner.invoke(cli, ["--repo", "invalid", "--pr-number", "1"])
        assert result.exit_code != 0