"""Tests for repository-focused tool handlers."""

from __future__ import annotations

import pytest

from aegis_gitea_mcp.config import reset_settings
from aegis_gitea_mcp.gitea_client import GiteaError
from aegis_gitea_mcp.tools.repository import (
    get_file_contents_tool,
    get_file_tree_tool,
    get_repository_info_tool,
    list_repositories_tool,
)


@pytest.fixture(autouse=True)
def repository_tool_env(monkeypatch: pytest.MonkeyPatch) -> None:
    """Provide minimal settings needed by response limit helpers."""
    reset_settings()
    monkeypatch.setenv("GITEA_URL", "https://gitea.example.com")
    monkeypatch.setenv("GITEA_TOKEN", "legacy-token")
    monkeypatch.setenv("MCP_API_KEYS", "a" * 64)
    monkeypatch.setenv("ENVIRONMENT", "test")
    yield
    reset_settings()


class RepoStub:
    """Stub Gitea client for repository tools."""

    async def list_repositories(self):
        return [{"name": "demo", "owner": {"login": "acme"}, "full_name": "acme/demo"}]

    async def get_repository(self, owner, repo):
        return {"name": repo, "owner": {"login": owner}, "full_name": f"{owner}/{repo}"}

    async def get_tree(self, owner, repo, ref, recursive):
        return {"tree": [{"path": "README.md", "type": "blob", "size": 11, "sha": "abc"}]}

    async def get_file_contents(self, owner, repo, filepath, ref):
        return {
            "content": "SGVsbG8gV29ybGQ=",
            "encoding": "base64",
            "size": 11,
            "sha": "abc",
            "html_url": f"https://example/{owner}/{repo}/{filepath}",
        }


class RepoErrorStub(RepoStub):
    """Stub that raises backend errors."""

    async def list_repositories(self):
        raise GiteaError("backend down")


@pytest.mark.asyncio
async def test_list_repositories_tool_success() -> None:
    """Repository listing tool normalizes output shape."""
    result = await list_repositories_tool(RepoStub(), {})
    assert result["count"] == 1
    assert result["repositories"][0]["owner"] == "acme"


@pytest.mark.asyncio
async def test_list_repositories_tool_failure_mode() -> None:
    """Repository listing tool wraps backend errors."""
    with pytest.raises(RuntimeError, match="Failed to list repositories"):
        await list_repositories_tool(RepoErrorStub(), {})


@pytest.mark.asyncio
async def test_get_repository_info_tool_success() -> None:
    """Repository info tool returns normalized metadata."""
    result = await get_repository_info_tool(RepoStub(), {"owner": "acme", "repo": "demo"})
    assert result["full_name"] == "acme/demo"


@pytest.mark.asyncio
async def test_get_file_tree_tool_success() -> None:
    """File tree tool returns bounded tree entries."""
    result = await get_file_tree_tool(
        RepoStub(),
        {"owner": "acme", "repo": "demo", "ref": "main", "recursive": False},
    )
    assert result["count"] == 1
    assert result["tree"][0]["path"] == "README.md"


@pytest.mark.asyncio
async def test_get_file_contents_tool_decodes_base64() -> None:
    """File contents tool decodes UTF-8 base64 payloads."""
    result = await get_file_contents_tool(
        RepoStub(),
        {"owner": "acme", "repo": "demo", "filepath": "README.md", "ref": "main"},
    )
    assert result["content"] == "Hello World"


@pytest.mark.asyncio
async def test_get_file_contents_tool_handles_invalid_base64() -> None:
    """Invalid base64 payloads are returned safely without crashing."""

    class InvalidBase64Stub(RepoStub):
        async def get_file_contents(self, owner, repo, filepath, ref):
            return {"content": "%%%not-base64%%%", "encoding": "base64", "size": 4, "sha": "abc"}

    result = await get_file_contents_tool(
        InvalidBase64Stub(),
        {"owner": "acme", "repo": "demo", "filepath": "README.md", "ref": "main"},
    )
    assert result["content"] == "%%%not-base64%%%"


@pytest.mark.asyncio
async def test_get_file_contents_tool_failure_mode() -> None:
    """File contents tool wraps backend failures."""

    class ErrorFileStub(RepoStub):
        async def get_file_contents(self, owner, repo, filepath, ref):
            raise GiteaError("boom")

    with pytest.raises(RuntimeError, match="Failed to get file contents"):
        await get_file_contents_tool(
            ErrorFileStub(),
            {"owner": "acme", "repo": "demo", "filepath": "README.md", "ref": "main"},
        )