"""Tests for services.installer — no GUI/network (download is mocked)."""
import hashlib
import shutil
import sys
import tempfile
import unittest
import zipfile
from pathlib import Path
from unittest.mock import patch

sys.path.insert(0, str(Path(__file__).parent.parent / "src"))

from services import installer
from services.update_service import UpdateInfo


def _make_release_zip(dst_zip, version, exe_body, wrap=False):
    tmp = Path(tempfile.mkdtemp())
    try:
        base = tmp / ("CMBot-" + version) if wrap else tmp
        base.mkdir(parents=True, exist_ok=True)
        (base / "CMBot.exe").write_text(exe_body, encoding="ascii")
        (base / "version.txt").write_text(version, encoding="ascii")
        with zipfile.ZipFile(str(dst_zip), "w", zipfile.ZIP_DEFLATED) as z:
            for p in base.rglob("*"):
                z.write(str(p), str(p.relative_to(tmp)))
    finally:
        shutil.rmtree(str(tmp), ignore_errors=True)
    return hashlib.sha256(dst_zip.read_bytes()).hexdigest()


class _Base(unittest.TestCase):
    def setUp(self):
        self.tmp = Path(tempfile.mkdtemp())
        self.root = self.tmp / "install"
        self.app = self.root / "app"
        self.app.mkdir(parents=True)
        (self.app / "CMBot.exe").write_text("OLD-1.0.0", encoding="ascii")
        (self.app / "version.txt").write_text("1.0.0", encoding="ascii")

    def tearDown(self):
        shutil.rmtree(str(self.tmp), ignore_errors=True)

    def _info(self, version, zip_path):
        return UpdateInfo(version=version, source="http://x/{}.zip".format(version),
                          sha256=hashlib.sha256(zip_path.read_bytes()).hexdigest(),
                          size=zip_path.stat().st_size)


class TestDownloadAndStage(_Base):
    def _copy_download(self, src_zip):
        def fake(url, dest, user="", password="", timeout=120):
            shutil.copy(str(src_zip), str(dest))
        return fake

    def test_stage_flat_zip(self):
        z = self.tmp / "n.zip"
        _make_release_zip(z, "1.1.0", "NEW")
        with patch("services.installer.download", side_effect=self._copy_download(z)):
            ver = installer.download_and_stage(self.root, self._info("1.1.0", z))
        self.assertEqual(ver, "1.1.0")
        self.assertEqual(installer.staged_version(self.root), "1.1.0")
        self.assertTrue((installer.staged_app(self.root) / "CMBot.exe").exists())
        # app untouched until apply
        self.assertEqual((self.app / "version.txt").read_text(encoding="ascii"), "1.0.0")

    def test_stage_wrapped_zip(self):
        z = self.tmp / "n.zip"
        _make_release_zip(z, "1.1.0", "NEW", wrap=True)
        with patch("services.installer.download", side_effect=self._copy_download(z)):
            ver = installer.download_and_stage(self.root, self._info("1.1.0", z))
        self.assertEqual(ver, "1.1.0")
        self.assertEqual(installer.staged_version(self.root), "1.1.0")

    def test_sha_mismatch_raises(self):
        z = self.tmp / "n.zip"
        _make_release_zip(z, "1.1.0", "NEW")
        info = self._info("1.1.0", z)
        info.sha256 = "deadbeef"
        with patch("services.installer.download", side_effect=self._copy_download(z)):
            with self.assertRaises(ValueError):
                installer.download_and_stage(self.root, info)
        self.assertEqual(installer.staged_version(self.root), "")

    def test_version_mismatch_raises(self):
        z = self.tmp / "n.zip"
        _make_release_zip(z, "1.1.0", "NEW")
        info = self._info("9.9.9", z)   # manifest claims a different version
        with patch("services.installer.download", side_effect=self._copy_download(z)):
            with self.assertRaises(ValueError):
                installer.download_and_stage(self.root, info)


class TestApplyStaged(_Base):
    def _stage(self, version, body):
        s = installer.staged_app(self.root)
        s.mkdir(parents=True, exist_ok=True)
        (s / "CMBot.exe").write_text(body, encoding="ascii")
        (s / "version.txt").write_text(version, encoding="ascii")

    def test_apply_swaps(self):
        self._stage("1.1.0", "NEW-1.1.0")
        applied = installer.apply_staged(self.root)
        self.assertEqual(applied, "1.1.0")
        self.assertEqual((self.app / "version.txt").read_text(encoding="ascii"), "1.1.0")
        self.assertEqual((self.app / "CMBot.exe").read_text(encoding="ascii"), "NEW-1.1.0")
        self.assertEqual((installer.old_dir(self.root) / "version.txt").read_text(encoding="ascii"), "1.0.0")
        self.assertEqual(installer.staged_version(self.root), "")

    def test_nothing_staged_returns_empty(self):
        self.assertEqual(installer.apply_staged(self.root), "")
        self.assertEqual((self.app / "version.txt").read_text(encoding="ascii"), "1.0.0")

    def test_not_newer_staged_is_discarded(self):
        self._stage("0.9.0", "OLDER")
        self.assertEqual(installer.apply_staged(self.root), "")
        self.assertEqual((self.app / "version.txt").read_text(encoding="ascii"), "1.0.0")
        self.assertFalse(installer.staged_app(self.root).exists())


class TestHelpers(_Base):
    def test_is_writable(self):
        self.assertTrue(installer.is_writable(self.root))

    def test_install_root_for(self):
        self.assertEqual(installer.install_root_for(self.app), self.root.resolve())


if __name__ == "__main__":
    unittest.main()