#!/usr/bin/env python3
"""
Tests for GitConfigRepo class (git repository operations)
"""

import json
from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest
from git.exc import GitCommandError

from skill_seekers.mcp.git_repo import GitConfigRepo


@pytest.fixture
def temp_cache_dir(tmp_path):
    """Create temporary cache directory for tests."""
    cache_dir = tmp_path / "test_cache"
    cache_dir.mkdir()
    return cache_dir


@pytest.fixture
def git_repo(temp_cache_dir):
    """Create GitConfigRepo instance with temp cache."""
    return GitConfigRepo(cache_dir=str(temp_cache_dir))


class TestGitConfigRepoInit:
    """Test GitConfigRepo initialization."""

    def test_init_with_custom_cache_dir(self, temp_cache_dir):
        """Test initialization with custom cache directory."""
        repo = GitConfigRepo(cache_dir=str(temp_cache_dir))
        assert repo.cache_dir == temp_cache_dir
        assert temp_cache_dir.exists()

    def test_init_with_env_var(self, tmp_path, monkeypatch):
        """Test initialization with environment variable."""
        env_cache = tmp_path / "env_cache"
        monkeypatch.setenv("SKILL_SEEKERS_CACHE_DIR", str(env_cache))

        repo = GitConfigRepo()
        assert repo.cache_dir == env_cache
        assert env_cache.exists()

    def test_init_with_default(self, monkeypatch):
        """Test initialization with default cache directory."""
        monkeypatch.delenv("SKILL_SEEKERS_CACHE_DIR", raising=False)

        repo = GitConfigRepo()
        expected = Path.home() / ".skill-seekers" / "cache"
        assert repo.cache_dir == expected


class TestValidateGitUrl:
    """Test git URL validation."""

    def test_validate_https_url(self):
        """Test validation of HTTPS URLs."""
        assert GitConfigRepo.validate_git_url("https://github.com/org/repo.git")
        assert GitConfigRepo.validate_git_url("https://gitlab.com/org/repo.git")

    def test_validate_http_url(self):
        """Test validation of HTTP URLs."""
        assert GitConfigRepo.validate_git_url("http://example.com/repo.git")

    def test_validate_ssh_url(self):
        """Test validation of SSH URLs."""
        assert GitConfigRepo.validate_git_url("git@github.com:org/repo.git")
        assert GitConfigRepo.validate_git_url("git@gitlab.com:group/project.git")

    def test_validate_file_url(self):
        """Test validation of file:// URLs."""
        assert GitConfigRepo.validate_git_url("file:///path/to/repo.git")

    def test_invalid_empty_url(self):
        """Test validation rejects empty URLs."""
        assert not GitConfigRepo.validate_git_url("")
        assert not GitConfigRepo.validate_git_url(None)

    def test_invalid_malformed_url(self):
        """Test validation rejects malformed URLs."""
        assert not GitConfigRepo.validate_git_url("not-a-url")
        assert not GitConfigRepo.validate_git_url("ftp://example.com/repo")

    def test_invalid_ssh_without_colon(self):
        """Test validation rejects SSH URLs without colon."""
        assert not GitConfigRepo.validate_git_url("git@github.com/org/repo.git")


class TestInjectToken:
    """Test token injection into git URLs."""

    def test_inject_token_https(self):
        """Test token injection into HTTPS URL."""
        url = "https://github.com/org/repo.git"
        token = "ghp_testtoken123"

        result = GitConfigRepo.inject_token(url, token)
        assert result == "https://ghp_testtoken123@github.com/org/repo.git"

    def test_inject_token_ssh_to_https(self):
        """Test SSH URL conversion to HTTPS with token."""
        url = "git@github.com:org/repo.git"
        token = "ghp_testtoken123"

        result = GitConfigRepo.inject_token(url, token)
        assert result == "https://ghp_testtoken123@github.com/org/repo.git"

    def test_inject_token_with_port(self):
        """Test token injection with custom port."""
        url = "https://gitlab.example.com:8443/org/repo.git"
        token = "token123"

        result = GitConfigRepo.inject_token(url, token)
        assert result == "https://token123@gitlab.example.com:8443/org/repo.git"

    def test_inject_token_gitlab_ssh(self):
        """Test GitLab SSH URL conversion."""
        url = "git@gitlab.com:group/project.git"
        token = "glpat-token123"

        result = GitConfigRepo.inject_token(url, token)
        assert result == "https://glpat-token123@gitlab.com/group/project.git"


class TestCloneOrPull:
    """Test clone and pull operations."""

    @patch("skill_seekers.mcp.git_repo.git.Repo.clone_from")
    def test_clone_new_repo(self, mock_clone, git_repo):
        """Test cloning a new repository."""
        mock_clone.return_value = MagicMock()

        result = git_repo.clone_or_pull(
            source_name="test-source", git_url="https://github.com/org/repo.git"
        )

        assert result == git_repo.cache_dir / "test-source"
        mock_clone.assert_called_once()

        # Verify shallow clone parameters
        call_kwargs = mock_clone.call_args[1]
        assert call_kwargs["depth"] == 1
        assert call_kwargs["single_branch"] is True
        assert call_kwargs["branch"] == "main"

    @patch("skill_seekers.mcp.git_repo.git.Repo")
    def test_pull_existing_repo(self, mock_repo_class, git_repo, temp_cache_dir):
        """Test pulling updates to existing repository."""
        # Create fake existing repo
        repo_path = temp_cache_dir / "test-source"
        repo_path.mkdir()
        (repo_path / ".git").mkdir()

        # Mock git.Repo
        mock_repo = MagicMock()
        mock_origin = MagicMock()
        mock_repo.remotes.origin = mock_origin
        mock_repo_class.return_value = mock_repo

        result = git_repo.clone_or_pull(
            source_name="test-source", git_url="https://github.com/org/repo.git"
        )

        assert result == repo_path
        mock_origin.pull.assert_called_once_with("main")

    @patch("skill_seekers.mcp.git_repo.git.Repo")
    def test_pull_with_token_update(self, mock_repo_class, git_repo, temp_cache_dir):
        """Test pulling with token updates remote URL."""
        # Create fake existing repo
        repo_path = temp_cache_dir / "test-source"
        repo_path.mkdir()
        (repo_path / ".git").mkdir()

        # Mock git.Repo
        mock_repo = MagicMock()
        mock_origin = MagicMock()
        mock_repo.remotes.origin = mock_origin
        mock_repo_class.return_value = mock_repo

        _result = git_repo.clone_or_pull(
            source_name="test-source",
            git_url="https://github.com/org/repo.git",
            token="ghp_token123",
        )

        # Verify URL was updated with token
        mock_origin.set_url.assert_called_once()
        updated_url = mock_origin.set_url.call_args[0][0]
        assert "ghp_token123@github.com" in updated_url

    @patch("skill_seekers.mcp.git_repo.git.Repo.clone_from")
    def test_force_refresh_deletes_cache(self, mock_clone, git_repo, temp_cache_dir):
        """Test force refresh deletes existing cache."""
        # Create fake existing repo
        repo_path = temp_cache_dir / "test-source"
        repo_path.mkdir()
        (repo_path / ".git").mkdir()
        (repo_path / "config.json").write_text("{}")

        mock_clone.return_value = MagicMock()

        git_repo.clone_or_pull(
            source_name="test-source", git_url="https://github.com/org/repo.git", force_refresh=True
        )

        # Verify clone was called (not pull)
        mock_clone.assert_called_once()

    @patch("skill_seekers.mcp.git_repo.git.Repo.clone_from")
    def test_clone_with_custom_branch(self, mock_clone, git_repo):
        """Test cloning with custom branch."""
        mock_clone.return_value = MagicMock()

        git_repo.clone_or_pull(
            source_name="test-source", git_url="https://github.com/org/repo.git", branch="develop"
        )

        call_kwargs = mock_clone.call_args[1]
        assert call_kwargs["branch"] == "develop"

    def test_clone_invalid_url_raises_error(self, git_repo):
        """Test cloning with invalid URL raises ValueError."""
        with pytest.raises(ValueError, match="Invalid git URL"):
            git_repo.clone_or_pull(source_name="test-source", git_url="not-a-valid-url")

    @patch("skill_seekers.mcp.git_repo.git.Repo.clone_from")
    def test_clone_auth_failure_error(self, mock_clone, git_repo):
        """Test authentication failure error handling."""
        mock_clone.side_effect = GitCommandError(
            "clone", 128, stderr="fatal: Authentication failed"
        )

        with pytest.raises(GitCommandError, match="Authentication failed"):
            git_repo.clone_or_pull(
                source_name="test-source", git_url="https://github.com/org/repo.git"
            )

    @patch("skill_seekers.mcp.git_repo.git.Repo.clone_from")
    def test_clone_not_found_error(self, mock_clone, git_repo):
        """Test repository not found error handling."""
        mock_clone.side_effect = GitCommandError("clone", 128, stderr="fatal: repository not found")

        with pytest.raises(GitCommandError, match="Repository not found"):
            git_repo.clone_or_pull(
                source_name="test-source", git_url="https://github.com/org/nonexistent.git"
            )


class TestFindConfigs:
    """Test config file discovery."""

    def test_find_configs_in_root(self, git_repo, temp_cache_dir):
        """Test finding config files in repository root."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        (repo_path / "config1.json").write_text("{}")
        (repo_path / "config2.json").write_text("{}")
        (repo_path / "README.md").write_text("# Readme")

        configs = git_repo.find_configs(repo_path)

        assert len(configs) == 2
        assert all(c.suffix == ".json" for c in configs)
        assert sorted([c.name for c in configs]) == ["config1.json", "config2.json"]

    def test_find_configs_in_subdirs(self, git_repo, temp_cache_dir):
        """Test finding config files in subdirectories."""
        repo_path = temp_cache_dir / "test-repo"
        configs_dir = repo_path / "configs"
        configs_dir.mkdir(parents=True)

        (repo_path / "root.json").write_text("{}")
        (configs_dir / "sub1.json").write_text("{}")
        (configs_dir / "sub2.json").write_text("{}")

        configs = git_repo.find_configs(repo_path)

        assert len(configs) == 3

    def test_find_configs_excludes_git_dir(self, git_repo, temp_cache_dir):
        """Test that .git directory is excluded from config search."""
        repo_path = temp_cache_dir / "test-repo"
        git_dir = repo_path / ".git" / "config"
        git_dir.mkdir(parents=True)

        (repo_path / "config.json").write_text("{}")
        (git_dir / "internal.json").write_text("{}")

        configs = git_repo.find_configs(repo_path)

        assert len(configs) == 1
        assert configs[0].name == "config.json"

    def test_find_configs_empty_repo(self, git_repo, temp_cache_dir):
        """Test finding configs in empty repository."""
        repo_path = temp_cache_dir / "empty-repo"
        repo_path.mkdir()

        configs = git_repo.find_configs(repo_path)

        assert configs == []

    def test_find_configs_nonexistent_repo(self, git_repo, temp_cache_dir):
        """Test finding configs in non-existent repository."""
        repo_path = temp_cache_dir / "nonexistent"

        configs = git_repo.find_configs(repo_path)

        assert configs == []

    def test_find_configs_sorted_by_name(self, git_repo, temp_cache_dir):
        """Test that configs are sorted by filename."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        (repo_path / "zebra.json").write_text("{}")
        (repo_path / "alpha.json").write_text("{}")
        (repo_path / "beta.json").write_text("{}")

        configs = git_repo.find_configs(repo_path)

        assert [c.name for c in configs] == ["alpha.json", "beta.json", "zebra.json"]


class TestGetConfig:
    """Test config file loading."""

    def test_get_config_exact_match(self, git_repo, temp_cache_dir):
        """Test loading config with exact filename match."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        config_data = {"name": "react", "version": "1.0"}
        (repo_path / "react.json").write_text(json.dumps(config_data))

        result = git_repo.get_config(repo_path, "react")

        assert result == config_data

    def test_get_config_with_json_extension(self, git_repo, temp_cache_dir):
        """Test loading config when .json extension is provided."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        config_data = {"name": "vue"}
        (repo_path / "vue.json").write_text(json.dumps(config_data))

        result = git_repo.get_config(repo_path, "vue.json")

        assert result == config_data

    def test_get_config_case_insensitive(self, git_repo, temp_cache_dir):
        """Test loading config with case-insensitive match."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        config_data = {"name": "Django"}
        (repo_path / "Django.json").write_text(json.dumps(config_data))

        result = git_repo.get_config(repo_path, "django")

        assert result == config_data

    def test_get_config_in_subdir(self, git_repo, temp_cache_dir):
        """Test loading config from subdirectory."""
        repo_path = temp_cache_dir / "test-repo"
        configs_dir = repo_path / "configs"
        configs_dir.mkdir(parents=True)

        config_data = {"name": "nestjs"}
        (configs_dir / "nestjs.json").write_text(json.dumps(config_data))

        result = git_repo.get_config(repo_path, "nestjs")

        assert result == config_data

    def test_get_config_not_found(self, git_repo, temp_cache_dir):
        """Test error when config not found."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        (repo_path / "react.json").write_text("{}")

        with pytest.raises(FileNotFoundError, match="Config 'vue.json' not found"):
            git_repo.get_config(repo_path, "vue")

    def test_get_config_not_found_shows_available(self, git_repo, temp_cache_dir):
        """Test error message shows available configs."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        (repo_path / "react.json").write_text("{}")
        (repo_path / "vue.json").write_text("{}")

        with pytest.raises(FileNotFoundError, match="Available configs: react, vue"):
            git_repo.get_config(repo_path, "django")

    def test_get_config_invalid_json(self, git_repo, temp_cache_dir):
        """Test error handling for invalid JSON."""
        repo_path = temp_cache_dir / "test-repo"
        repo_path.mkdir()

        (repo_path / "broken.json").write_text("{ invalid json }")

        with pytest.raises(ValueError, match="Invalid JSON"):
            git_repo.get_config(repo_path, "broken")
