"""Unit tests for devx.tools.create_pr."""

from unittest.mock import MagicMock, patch

import click
import pytest
from click.testing import CliRunner

from devx.tools.create_pr import (
    cli,
    create_pr,
    extract_task_id,
    find_existing_pr,
    get_repo_name,
    get_vikunja_task_title,
)


class TestExtractTaskId:
    def test_valid(self) -> None:
        assert extract_task_id("DEVX-42-fix") == "DEVX-42"

    def test_invalid(self) -> None:
        assert extract_task_id("feature") == ""


class TestGetRepoName:
    @patch.dict("os.environ", {"DEVX_REPO_NAME": "infra"})
    def test_from_env(self) -> None:
        assert get_repo_name() == "infra"

    @patch("devx.tools.create_pr.REPO_NAME", "devx")
    @patch.dict("os.environ", {"GITHUB_REPOSITORY": "oblachno/infra"}, clear=True)
    def test_env_overrides_pyproject(self) -> None:
        assert get_repo_name() == "infra"

    @patch("devx.tools.create_pr.REPO_NAME", "devx")
    @patch.dict("os.environ", {}, clear=True)
    def test_from_pyproject(self) -> None:
        assert get_repo_name() == "devx"

    @patch("devx.tools.create_pr.REPO_NAME", "")
    @patch.dict("os.environ", {"GITHUB_REPOSITORY": "oblachno/infra"}, clear=True)
    def test_from_github(self) -> None:
        assert get_repo_name() == "infra"

    @patch("devx.tools.create_pr.REPO_NAME", "")
    @patch.dict("os.environ", {}, clear=True)
    def test_missing_raises(self) -> None:
        with pytest.raises(click.ClickException, match="Repository name"):
            get_repo_name()


class TestGetVikunjaTaskTitle:
    @patch("devx.tools.create_pr.VikunjaClient")
    @patch.dict("os.environ", {"VIKUNJA_TOKEN": "tok"})
    def test_found(self, mock_client_cls: MagicMock) -> None:
        mock_client = MagicMock()
        mock_client.find_task_by_identifier.return_value = {"identifier": "DEVX-42", "title": "Add feature"}
        mock_client_cls.return_value = mock_client
        assert get_vikunja_task_title("DEVX-42") == "Add feature"

    @patch.dict("os.environ", {}, clear=True)
    def test_no_token(self) -> None:
        with pytest.raises(click.ClickException, match="VIKUNJA_TOKEN"):
            get_vikunja_task_title("DEVX-42")

    @patch("devx.tools.create_pr.VikunjaClient")
    @patch.dict("os.environ", {"VIKUNJA_TOKEN": "tok"})
    def test_not_found(self, mock_client_cls: MagicMock) -> None:
        mock_client = MagicMock()
        mock_client.find_task_by_identifier.return_value = None
        mock_client_cls.return_value = mock_client
        with pytest.raises(click.ClickException, match="Could not find"):
            get_vikunja_task_title("DEVX-42")


class TestFindExistingPr:
    def test_found(self) -> None:
        client = MagicMock()
        client.list_prs.return_value = [{"head": {"ref": "DEVX-42-fix"}, "number": 10}]
        result = find_existing_pr(client, "DEVX-42-fix")
        assert result is not None
        assert result["number"] == 10

    def test_not_found(self) -> None:
        client = MagicMock()
        client.list_prs.return_value = [{"head": {"ref": "other"}, "number": 10}]
        result = find_existing_pr(client, "DEVX-42-fix")
        assert result is None


class TestCreatePr:
    @patch("devx.tools.create_pr.GiteaClient")
    @patch("devx.tools.create_pr.get_vikunja_task_title", return_value="Add feature")
    @patch("devx.tools.create_pr.find_existing_pr", return_value=None)
    @patch.dict("os.environ", {"CI_GITEA_TOKEN": "tok"})
    def test_creates_new_pr(self, mock_find: MagicMock, mock_title: MagicMock, mock_gitea: MagicMock) -> None:
        mock_client = MagicMock()
        mock_client.create_pr.return_value = {"number": 15, "html_url": "https://git.example.com/pr/15"}
        mock_gitea.return_value = mock_client
        result = create_pr("DEVX-42-fix", "master", "body", "owner", "repo")
        assert result["number"] == 15
        mock_client.create_pr.assert_called_once_with(
            title="DEVX-42: Add feature",
            head="DEVX-42-fix",
            base="master",
            body="body",
        )

    @patch("devx.tools.create_pr.GiteaClient")
    @patch("devx.tools.create_pr.get_vikunja_task_title", return_value="Add feature")
    @patch("devx.tools.create_pr.find_existing_pr")
    @patch.dict("os.environ", {"CI_GITEA_TOKEN": "tok"})
    def test_existing_pr_idempotent(self, mock_find: MagicMock, mock_title: MagicMock, mock_gitea: MagicMock) -> None:
        mock_find.return_value = {"number": 10, "html_url": "https://git.example.com/pr/10"}
        mock_client = MagicMock()
        mock_gitea.return_value = mock_client
        result = create_pr("DEVX-42-fix", "master", "", "owner", "repo")
        assert result["number"] == 10
        mock_client.create_pr.assert_not_called()

    @patch.dict("os.environ", {}, clear=True)
    def test_no_repo_token(self) -> None:
        with pytest.raises(click.ClickException, match="CI_GITEA_TOKEN"):
            create_pr("DEVX-42-fix", "master", "", "owner", "repo")

    @patch.dict("os.environ", {"CI_GITEA_TOKEN": "tok"})
    def test_no_task_id_in_branch(self) -> None:
        with pytest.raises(click.ClickException, match="does not contain a task ID"):
            create_pr("feature-branch", "master", "", "owner", "repo")


class TestCli:
    @patch("devx.tools.create_pr.create_pr")
    @patch("devx.tools.create_pr.subprocess.run")
    @patch("devx.tools.create_pr.REPO_OWNER", "owner")
    @patch("devx.tools.create_pr.get_repo_name", return_value="repo")
    def test_auto_detect_branch(self, mock_repo: MagicMock, mock_run: MagicMock, mock_create: MagicMock) -> None:
        mock_run.return_value = MagicMock(stdout="DEVX-42-fix\n", returncode=0)
        mock_create.return_value = {"number": 1}
        runner = CliRunner()
        result = runner.invoke(cli, [])
        assert result.exit_code == 0
        mock_create.assert_called_once_with("DEVX-42-fix", "master", "", "owner", "repo")

    @patch("devx.tools.create_pr.create_pr")
    @patch("devx.tools.create_pr.REPO_OWNER", "owner")
    @patch("devx.tools.create_pr.get_repo_name", return_value="repo")
    def test_explicit_branch(self, mock_repo: MagicMock, mock_create: MagicMock) -> None:
        mock_create.return_value = {"number": 1}
        runner = CliRunner()
        result = runner.invoke(cli, ["--branch", "DEVX-42-fix"])
        assert result.exit_code == 0

    @patch("devx.tools.create_pr.create_pr")
    @patch("devx.tools.create_pr.REPO_OWNER", "owner")
    @patch("devx.tools.create_pr.get_repo_name", return_value="repo")
    def test_body_from_stdin(self, mock_repo: MagicMock, mock_create: MagicMock) -> None:
        mock_create.return_value = {"number": 1}
        runner = CliRunner()
        result = runner.invoke(cli, ["--branch", "DEVX-42-fix", "--body", "-"], input="PR body text")
        assert result.exit_code == 0
        mock_create.assert_called_once()
        assert mock_create.call_args.args[2] == "PR body text"

    @patch("devx.tools.create_pr.REPO_OWNER", "")
    @patch("devx.tools.create_pr.get_repo_name", return_value="repo")
    def test_missing_owner(self, mock_repo: MagicMock) -> None:
        runner = CliRunner()
        result = runner.invoke(cli, ["--branch", "DEVX-42-fix"])
        assert result.exit_code != 0
        assert "owner" in result.output.lower()

    @patch("devx.tools.create_pr.create_pr")
    @patch("devx.tools.create_pr.get_repo_name", return_value="repo")
    def test_explicit_owner(self, mock_repo: MagicMock, mock_create: MagicMock) -> None:
        mock_create.return_value = {"number": 1}
        runner = CliRunner()
        result = runner.invoke(cli, ["--branch", "DEVX-42-fix", "--owner", "custom"])
        assert result.exit_code == 0
        mock_create.assert_called_once_with("DEVX-42-fix", "master", "", "custom", "repo")

    @patch("devx.tools.create_pr.subprocess.run")
    @patch("devx.tools.create_pr.REPO_OWNER", "owner")
    @patch("devx.tools.create_pr.get_repo_name", return_value="repo")
    def test_git_detect_failure(self, mock_repo: MagicMock, mock_run: MagicMock) -> None:
        mock_run.return_value = MagicMock(stdout="", stderr="fatal: not a git repository", returncode=128)
        runner = CliRunner()
        result = runner.invoke(cli, [])
        assert result.exit_code != 0
        assert "Could not detect" in result.output