"""Verify pipeline gates and deployment against temporary local directories."""

import importlib.util
from pathlib import Path
import sys
from unittest.mock import patch, Mock
import zipfile

import pytest

PIPELINE_DIR = Path(__file__).resolve().parents[2] / "1_build-pipeline"
sys.path.insert(0, str(PIPELINE_DIR))
import deploy

spec = importlib.util.spec_from_file_location("build_pipeline", PIPELINE_DIR / "build.py")
build = importlib.util.module_from_spec(spec)
spec.loader.exec_module(build)


@pytest.fixture
def release(tmp_path):
    directory = tmp_path / "build"
    directory.mkdir()
    for name in deploy.PACKAGE_FILES:
        path = directory / name
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_bytes(b"test release payload")
    deploy.write_release_manifest(directory, "1.3")
    target = tmp_path / "share"
    target.mkdir()
    return directory, target


def test_deployment_packages_release_without_work_files(release):
    directory, target = release
    for folder in ["input", "output"]:
        (directory / folder).mkdir()
        (directory / folder / "private.xlsx").write_bytes(b"private")
    result = deploy.deploy(directory, target)
    assert result.name == "Tätigkeitsnachweis-Generator v1.3.0.zip"
    with zipfile.ZipFile(result) as archive:
        assert set(archive.namelist()) == set(deploy.PACKAGE_FILES + ["input/", "output/"])
        assert archive.testzip() is None
    assert not list(target.glob(".upload-*"))
    # An unchanged release can be retried without overwriting the published ZIP.
    original_time = result.stat().st_mtime_ns
    assert deploy.deploy(directory, target) == result
    assert result.stat().st_mtime_ns == original_time


def test_missing_vpn_target_is_not_created(release):
    directory, target = release
    missing = target / "missing-share"
    with pytest.raises(OSError, match="VPN"):
        deploy.deploy(directory, missing)
    assert not missing.exists()
    assert not list(directory.glob("*.zip"))


def test_changed_payload_is_not_deployed(release):
    directory, target = release
    (directory / deploy.EXE_NAME).write_bytes(b"different executable")
    with pytest.raises(ValueError, match="verändert"):
        deploy.deploy(directory, target)
    assert not list(target.iterdir())


def test_unconfirmed_old_build_is_not_deployed(release):
    directory, target = release
    (directory / deploy.MANIFEST_NAME).unlink()
    with pytest.raises(ValueError, match="bestätigter Build"):
        deploy.deploy(directory, target)


def test_existing_different_release_is_preserved(release):
    directory, target = release
    existing = target / "Tätigkeitsnachweis-Generator v1.3.0.zip"
    existing.write_bytes(b"already published")
    with pytest.raises(FileExistsError, match="anderem Inhalt"):
        deploy.deploy(directory, target)
    assert existing.read_bytes() == b"already published"


def test_interrupted_upload_is_not_published(release):
    directory, target = release
    with patch.object(deploy.shutil, "copyfile", side_effect=OSError("VPN disconnected")):
        with pytest.raises(OSError, match="lokale Build bleibt erhalten"):
            deploy.deploy(directory, target)
    assert not list(target.iterdir())
    assert list(directory.glob("*.zip"))
    assert deploy.validate_release(directory) == "1.3.0"


def test_corrupt_upload_is_not_published(release):
    directory, target = release
    def corrupt_copy(source, destination):
        Path(destination).write_bytes(b"corrupted")
    with patch.object(deploy.shutil, "copyfile", side_effect=corrupt_copy):
        with pytest.raises(OSError):
            deploy.deploy(directory, target)
    assert not list(target.iterdir())


@pytest.fixture
def pipeline(tmp_path, monkeypatch):
    changelog = tmp_path / "CHANGELOG.md"
    changelog.write_text("## [1.3]\n\nOriginal release\n", encoding="utf-8")
    version_file = tmp_path / ".last_version"
    version_file.write_text("1.3", encoding="utf-8")
    monkeypatch.setattr(build, "CHANGELOG_PATH", changelog)
    monkeypatch.setattr(build, "VERSION_FILE", version_file)
    monkeypatch.setattr(build, "BUILD_OUTPUT_DIR", tmp_path)
    monkeypatch.setattr(sys, "argv", ["build.py", "--bump", "patch", "--message", "Fix"])
    events = []
    names = ["_run_tests", "_ensure_pyinstaller", "_prepare_build_dir", "_run_pyinstaller",
             "_copy_to_build", "write_release_manifest", "_cleanup", "_print_summary", "deploy"]
    mocks = {}
    for name in names:
        mocks[name] = Mock(side_effect=lambda *args, _name=name: events.append(_name))
        monkeypatch.setattr(build, name, mocks[name])
    return changelog, version_file, events, mocks


def test_pipeline_tests_build_then_deploy(pipeline):
    changelog, version_file, events, mocks = pipeline
    build.main()
    assert events == ["_run_tests", "_ensure_pyinstaller", "_prepare_build_dir", "_run_pyinstaller",
                      "_copy_to_build", "write_release_manifest", "_cleanup", "_print_summary", "deploy"]
    assert version_file.read_text() == "1.3.1"
    assert "## [1.3.1]" in changelog.read_text(encoding="utf-8")


def test_failing_tests_prevent_version_change_build_and_deploy(pipeline):
    changelog, version_file, events, mocks = pipeline
    original = changelog.read_bytes()
    mocks["_run_tests"].side_effect = SystemExit(1)
    with pytest.raises(SystemExit):
        build.main()
    assert changelog.read_bytes() == original
    assert version_file.read_text() == "1.3"
    mocks["_run_pyinstaller"].assert_not_called()
    mocks["deploy"].assert_not_called()


def test_build_failure_rolls_back_changelog_and_prevents_deployment(pipeline):
    changelog, version_file, events, mocks = pipeline
    original = changelog.read_text(encoding="utf-8")
    mocks["_run_pyinstaller"].side_effect = SystemExit(1)
    with pytest.raises(SystemExit):
        build.main()
    assert changelog.read_text(encoding="utf-8") == original
    assert version_file.read_text() == "1.3"
    mocks["deploy"].assert_not_called()
    mocks["_cleanup"].assert_called_once()


def test_deploy_failure_keeps_successful_build_version(pipeline):
    changelog, version_file, events, mocks = pipeline
    mocks["deploy"].side_effect = OSError("VPN unavailable")
    with pytest.raises(SystemExit):
        build.main()
    assert version_file.read_text() == "1.3.1"
    assert "## [1.3.1]" in changelog.read_text(encoding="utf-8")
    mocks["write_release_manifest"].assert_called_once()


def test_dry_run_does_not_test_build_or_deploy(pipeline, monkeypatch):
    changelog, version_file, events, mocks = pipeline
    monkeypatch.setattr(sys, "argv", ["build.py", "--bump", "patch", "--dry-run"])
    build.main()
    assert not events
    assert version_file.read_text() == "1.3"


def test_rebuild_preserves_changelog_and_version(pipeline, monkeypatch):
    changelog, version_file, events, mocks = pipeline
    original = changelog.read_bytes()
    monkeypatch.setattr(sys, "argv", ["build.py", "--no-bump", "--no-deploy"])
    build.main()
    assert changelog.read_bytes() == original
    assert version_file.read_text() == "1.3"
    mocks["write_release_manifest"].assert_called_once_with(build.BUILD_OUTPUT_DIR, "1.3")
    mocks["_run_tests"].assert_called_once()
    mocks["_run_pyinstaller"].assert_called_once()
    mocks["deploy"].assert_not_called()