import json
from typing import Any
from unittest.mock import MagicMock
from gitea.client import GiteaClient
from gitea.models import PullRequestModel, CommentModel, RepositoryModel
from gitea.tools.pr_tools import PRTools


def _create_mock_client() -> MagicMock:
    """Create a mock GiteaClient with sub-client attributes."""
    mock_client: MagicMock = MagicMock(spec=GiteaClient)
    mock_client.prs = MagicMock()
    mock_client.repos = MagicMock()
    return mock_client


def test_get_pull_request_success() -> None:
    mock_client = _create_mock_client()
    pr: PullRequestModel = PullRequestModel(number=1, title="Test PR", state="open")
    mock_client.prs.get_pull_request.return_value = pr

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request("owner", "repo", 1)

    data: dict[str, Any] = json.loads(res)
    assert data["number"] == 1
    assert data["title"] == "Test PR"
    mock_client.prs.get_pull_request.assert_called_once_with("owner", "repo", 1)


def test_get_pull_request_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.get_pull_request.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request("owner", "repo", 1)
    assert "Error getting pull request: API Error" in res


def test_close_pull_request_success() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.close_pull_request.return_value = PullRequestModel(
        number=1, state="closed"
    )

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.close_pull_request("owner", "repo", 1)
    assert res == "Pull request #1 closed successfully."
    mock_client.prs.close_pull_request.assert_called_once_with("owner", "repo", 1)


def test_close_pull_request_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.close_pull_request.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.close_pull_request("owner", "repo", 1)
    assert "Error closing pull request: API Error" in res


def test_get_pull_request_comments_success() -> None:
    mock_client = _create_mock_client()
    comment: CommentModel = CommentModel(id=123, body="Comment body")
    mock_client.prs.get_pull_request_comments.return_value = [comment]

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request_comments("owner", "repo", 1)
    data: list[dict[str, Any]] = json.loads(res)
    assert len(data) == 1
    assert data[0]["body"] == "Comment body"


def test_get_pull_request_comments_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.get_pull_request_comments.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request_comments("owner", "repo", 1)
    assert "Error getting PR comments: API Error" in res


def test_list_assigned_pull_requests_success() -> None:
    mock_client = _create_mock_client()
    repo: RepositoryModel = RepositoryModel(name="repo1", owner="owner1")
    pr: PullRequestModel = PullRequestModel(number=1, title="Test PR")
    mock_client.repos.list_all_user_repos.return_value = [repo]
    mock_client.prs.list_assigned_pull_requests.return_value = [pr]

    pr_tools: PRTools = PRTools(mock_client)
    res: list[dict[str, Any]] = pr_tools.list_assigned_pull_requests()
    assert len(res) == 1
    assert res[0]["number"] == 1
    mock_client.repos.list_all_user_repos.assert_called_once()
    mock_client.prs.list_assigned_pull_requests.assert_called_once_with(
        "owner1", "repo1"
    )


def test_list_assigned_pull_requests_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.repos.list_all_user_repos.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: list[dict[str, Any]] = pr_tools.list_assigned_pull_requests()
    assert res == []


def test_list_pull_requests_success() -> None:
    mock_client = _create_mock_client()
    pr: PullRequestModel = PullRequestModel(number=1, title="Test PR")
    mock_client.prs.list_repo_pull_requests.return_value = [pr]

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.list_pull_requests("owner", "repo")
    assert "#1: Test PR" in res


def test_list_pull_requests_empty() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.list_repo_pull_requests.return_value = []

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.list_pull_requests("owner", "repo")
    assert res == "No PRs in owner/repo."


def test_list_pull_requests_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.list_repo_pull_requests.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.list_pull_requests("owner", "repo")
    assert "Error listing PRs: API Error" in res


def test_create_pull_request_success() -> None:
    mock_client = _create_mock_client()
    pr: PullRequestModel = PullRequestModel(number=2, title="Title")
    mock_client.prs.create_pr_via_tea.return_value = pr

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.create_pull_request(
        "owner", "repo", "head", "base", "Title", "Desc"
    )
    data: dict[str, Any] = json.loads(res)
    assert data["number"] == 2
    mock_client.prs.create_pr_via_tea.assert_called_once_with(
        "owner", "repo", "Title", "Desc", "head", "base"
    )


def test_create_pull_request_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.create_pr_via_tea.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.create_pull_request("owner", "repo", "head", "base", "Title")
    assert "Error creating PR: API Error" in res


def test_add_label_to_pr_success() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.add_label_pr.return_value = {}

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.add_label_to_pr("owner", "repo", 1, "bug")
    assert res == "Label 'bug' added to PR #1."


def test_add_label_to_pr_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.add_label_pr.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.add_label_to_pr("owner", "repo", 1, "bug")
    assert "Error adding label to PR #1: API Error" in res


def test_get_pull_request_diff_success() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.get_pull_request_diff.return_value = "diff content"

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request_diff("owner", "repo", 1)
    assert res == "diff content"


def test_get_pull_request_diff_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.get_pull_request_diff.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request_diff("owner", "repo", 1)
    assert "Error getting PR diff: API Error" in res


def test_get_pull_request_patch_success() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.get_pull_request_patch.return_value = "patch content"

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request_patch("owner", "repo", 1)
    assert res == "patch content"


def test_get_pull_request_patch_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.get_pull_request_patch.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.get_pull_request_patch("owner", "repo", 1)
    assert "Error getting PR patch: API Error" in res


def test_approve_pull_request_success() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.approve_pr.return_value = {}

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.approve_pull_request("owner", "repo", 1, "good")
    assert res == "Approved PR #1."


def test_approve_pull_request_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.approve_pr.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.approve_pull_request("owner", "repo", 1, "good")
    assert "Error approving PR: API Error" in res


def test_request_changes_success() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.request_changes_pr.return_value = {}

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.request_changes("owner", "repo", 1, "bad")
    assert res == "Requested changes on PR #1."


def test_request_changes_failure() -> None:
    mock_client = _create_mock_client()
    mock_client.prs.request_changes_pr.side_effect = Exception("API Error")

    pr_tools: PRTools = PRTools(mock_client)
    res: str = pr_tools.request_changes("owner", "repo", 1, "bad")
    assert "Error requesting changes: API Error" in res