"""Tests for git operations module."""

import subprocess

import pytest
from pathlib import Path

from auto_commit_service.git import (
    git_status,
    git_diff,
    git_add_all,
    git_commit,
    git_fetch,
    pre_cycle_sync,
)
from auto_commit_service.git.repository import Repository


class TestGitStatus:
    """Tests for git_status function."""

    async def test_clean_repo(self, temp_git_repo: Path) -> None:
        """Test status of a clean repository."""
        status = await git_status(temp_git_repo)

        assert not status.has_changes
        assert status.staged == []
        assert status.modified == []
        assert status.untracked == []

    async def test_with_untracked_file(self, temp_git_repo: Path) -> None:
        """Test status with an untracked file."""
        (temp_git_repo / "new_file.txt").write_text("content")

        status = await git_status(temp_git_repo)

        assert status.has_changes
        assert "new_file.txt" in status.untracked

    async def test_with_modified_file(self, temp_git_repo: Path) -> None:
        """Test status with a modified file."""
        (temp_git_repo / "README.md").write_text("# Modified\n")

        status = await git_status(temp_git_repo)

        assert status.has_changes
        assert "README.md" in status.modified


class TestGitDiff:
    """Tests for git_diff function."""

    async def test_no_changes(self, temp_git_repo: Path) -> None:
        """Test diff with no changes."""
        diff = await git_diff(temp_git_repo)
        assert diff == ""

    async def test_with_changes(self, temp_git_repo: Path) -> None:
        """Test diff with modified file."""
        (temp_git_repo / "README.md").write_text("# Modified content\n")

        diff = await git_diff(temp_git_repo)

        assert "README.md" in diff
        assert "Modified content" in diff


class TestGitCommit:
    """Tests for git_commit function."""

    async def test_commit_changes(self, temp_git_repo: Path) -> None:
        """Test committing staged changes."""
        # Create and stage a file
        (temp_git_repo / "new_file.py").write_text("print('hello')")
        await git_add_all(temp_git_repo)

        # Commit
        result = await git_commit(temp_git_repo, "✨ Add new file")

        assert result.success
        assert result.commit_hash is not None
        assert len(result.commit_hash) >= 7

    async def test_commit_nothing_to_commit(self, temp_git_repo: Path) -> None:
        """Test commit with nothing to commit."""
        result = await git_commit(temp_git_repo, "Empty commit")

        assert not result.success
        assert "Nothing to commit" in (result.error or "")


class TestRepository:
    """Tests for Repository class."""

    def test_exists_valid_repo(self, temp_git_repo: Path) -> None:
        """Test exists property for valid repo."""
        repo = Repository(name="test", path=temp_git_repo)
        assert repo.exists

    def test_exists_invalid_path(self, tmp_path: Path) -> None:
        """Test exists property for non-existent path."""
        repo = Repository(name="test", path=tmp_path / "nonexistent")
        assert not repo.exists

    def test_exists_non_git_directory(self, tmp_path: Path) -> None:
        """Test exists property for directory without .git."""
        non_git = tmp_path / "not-a-repo"
        non_git.mkdir()
        repo = Repository(name="test", path=non_git)
        assert not repo.exists


def _make_bare_remote(tmp_path: Path, repo_path: Path) -> Path:
    """Create a bare remote and configure repo to push/fetch from it."""
    bare = tmp_path / "remote.git"
    subprocess.run(["git", "init", "--bare", str(bare)], check=True, capture_output=True)
    subprocess.run(
        ["git", "remote", "add", "origin", str(bare)],
        cwd=repo_path, check=True, capture_output=True,
    )
    subprocess.run(
        ["git", "push", "-u", "origin", "master"],
        cwd=repo_path, check=True, capture_output=True,
    )
    return bare


def _clone_from_bare(tmp_path: Path, bare: Path, name: str) -> Path:
    """Clone from bare remote into a new working copy."""
    clone = tmp_path / name
    subprocess.run(
        ["git", "clone", str(bare), str(clone)],
        check=True, capture_output=True,
    )
    subprocess.run(
        ["git", "config", "user.email", "test@test.com"],
        cwd=clone, check=True, capture_output=True,
    )
    subprocess.run(
        ["git", "config", "user.name", "Test User"],
        cwd=clone, check=True, capture_output=True,
    )
    return clone


class TestGitFetch:
    """Tests for git_fetch function."""

    async def test_fetch_success(self, temp_git_repo: Path, tmp_path: Path) -> None:
        """Test fetching from a valid remote."""
        bare = _make_bare_remote(tmp_path, temp_git_repo)
        result = await git_fetch(temp_git_repo, "origin")
        assert result is True

    async def test_fetch_no_remote(self, temp_git_repo: Path) -> None:
        """Test fetch with no remote configured (graceful failure)."""
        result = await git_fetch(temp_git_repo, "origin")
        assert result is False


class TestPreCycleSync:
    """Tests for pre_cycle_sync function."""

    async def test_not_behind(self, temp_git_repo: Path, tmp_path: Path) -> None:
        """Test sync when already up-to-date."""
        _make_bare_remote(tmp_path, temp_git_repo)

        result = await pre_cycle_sync(temp_git_repo, "origin", "master")

        assert result["fetched"] is True
        assert result["pulled"] is False
        assert result["behind_count"] == 0
        assert result["error"] is None

    async def test_behind_clean_tree(self, temp_git_repo: Path, tmp_path: Path) -> None:
        """Test sync when behind with clean working tree — pulls without stash."""
        bare = _make_bare_remote(tmp_path, temp_git_repo)

        # Create a second clone, commit, push — making temp_git_repo behind
        other = _clone_from_bare(tmp_path, bare, "other-clone")
        (other / "other.txt").write_text("from other host")
        subprocess.run(["git", "add", "."], cwd=other, check=True, capture_output=True)
        subprocess.run(
            ["git", "commit", "-m", "commit from other host"],
            cwd=other, check=True, capture_output=True,
        )
        subprocess.run(
            ["git", "push", "origin", "master"],
            cwd=other, check=True, capture_output=True,
        )

        result = await pre_cycle_sync(temp_git_repo, "origin", "master")

        assert result["fetched"] is True
        assert result["pulled"] is True
        assert result["behind_count"] == 1
        assert result["skipped_dirty"] is False
        assert result["error"] is None
        # Verify the file arrived
        assert (temp_git_repo / "other.txt").exists()

    async def test_behind_dirty_tree_skips_pull(self, temp_git_repo: Path, tmp_path: Path) -> None:
        """Test sync when behind with dirty working tree — skips pull entirely."""
        bare = _make_bare_remote(tmp_path, temp_git_repo)

        # Push a commit from another clone
        other = _clone_from_bare(tmp_path, bare, "other-clone")
        (other / "other.txt").write_text("from other host")
        subprocess.run(["git", "add", "."], cwd=other, check=True, capture_output=True)
        subprocess.run(
            ["git", "commit", "-m", "commit from other host"],
            cwd=other, check=True, capture_output=True,
        )
        subprocess.run(
            ["git", "push", "origin", "master"],
            cwd=other, check=True, capture_output=True,
        )

        # Dirty the local working tree
        (temp_git_repo / "local_wip.txt").write_text("work in progress")

        result = await pre_cycle_sync(temp_git_repo, "origin", "master")

        assert result["fetched"] is True
        assert result["pulled"] is False
        assert result["skipped_dirty"] is True
        assert result["behind_count"] == 1
        assert result["error"] is None
        # Remote file NOT pulled (skipped due to dirty tree)
        assert not (temp_git_repo / "other.txt").exists()
        # Local WIP untouched
        assert (temp_git_repo / "local_wip.txt").exists()

    async def test_fetch_failure(self, temp_git_repo: Path) -> None:
        """Test sync with no remote — fetch fails gracefully."""
        result = await pre_cycle_sync(temp_git_repo, "origin", "master")

        assert result["fetched"] is False
        assert result["pulled"] is False
        assert result["error"] == "fetch_failed"