import subprocess
from dataclasses import replace
from pathlib import Path
from unittest.mock import Mock

import pytest

from lai_automation.git import GitWorkspace
from lai_automation.models import ChangeSummary


def test_normalize_changed_whitespace_cleans_new_text_file(
    settings,
    tmp_path: Path,
) -> None:
    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
    workspace.path.mkdir(parents=True)
    changed = workspace.path / "new.php"
    changed.write_bytes(b"<?php \r\nreturn true;\t")
    workspace._git = Mock(
        side_effect=[
            subprocess.CompletedProcess([], 0, "", ""),
            subprocess.CompletedProcess([], 0, "new.php\n", ""),
        ]
    )

    normalized = workspace.normalize_changed_whitespace(
        ChangeSummary(("new.php",), 2, 0)
    )

    assert normalized == ("new.php",)
    assert changed.read_bytes() == b"<?php\r\nreturn true;"


def test_normalize_changed_whitespace_only_cleans_reported_tracked_lines(
    settings,
    tmp_path: Path,
) -> None:
    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
    workspace.path.mkdir(parents=True)
    changed = workspace.path / "tracked.php"
    changed.write_bytes(b"<?php \nlegacy whitespace \n")
    workspace._git = Mock(
        side_effect=[
            subprocess.CalledProcessError(
                2,
                ["git", "diff", "--check"],
                output="tracked.php:1: trailing whitespace.\n",
                stderr="",
            ),
            subprocess.CompletedProcess([], 0, "", ""),
        ]
    )

    normalized = workspace.normalize_changed_whitespace(
        ChangeSummary(("tracked.php",), 1, 1)
    )

    assert normalized == ("tracked.php",)
    assert changed.read_bytes() == b"<?php\nlegacy whitespace \n"


def test_check_diff_accepts_clean_changed_file(settings, tmp_path: Path) -> None:
    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
    workspace.path.mkdir(parents=True)
    (workspace.path / "app.php").write_text("<?php\nreturn true;\n")
    workspace._git = Mock(
        side_effect=[
            subprocess.CompletedProcess([], 0, "", ""),
            subprocess.CompletedProcess([], 0, "app.php\n", ""),
        ]
    )

    workspace.check_diff(ChangeSummary(("app.php",), 2, 0))

    assert workspace._git.call_count == 2


def test_check_diff_rejects_trailing_whitespace_in_untracked_file(
    settings,
    tmp_path: Path,
) -> None:
    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
    workspace.path.mkdir(parents=True)
    (workspace.path / "app.php").write_text("<?php \n")
    workspace._git = Mock(
        side_effect=[
            subprocess.CompletedProcess([], 0, "", ""),
            subprocess.CompletedProcess([], 0, "app.php\n", ""),
        ]
    )

    with pytest.raises(RuntimeError, match="trailing whitespace"):
        workspace.check_diff(ChangeSummary(("app.php",), 1, 0))


def test_check_diff_ignores_unchanged_whitespace_in_tracked_file(
    settings,
    tmp_path: Path,
) -> None:
    workspace = GitWorkspace(replace(settings, workspace_root=tmp_path), 1)
    workspace.path.mkdir(parents=True)
    (workspace.path / "legacy.php").write_text("<?php \nreturn true;\n")
    workspace._git = Mock(
        side_effect=[
            subprocess.CompletedProcess([], 0, "", ""),
            subprocess.CompletedProcess([], 0, "", ""),
        ]
    )

    workspace.check_diff(ChangeSummary(("legacy.php",), 1, 0))