"""Run the real handoffs against a disposable CLI, never an installed updater."""

from __future__ import annotations

import json
import os
from pathlib import Path
import shlex
import subprocess
import sys

import pytest

from tests.installation_launcher_fixture import publish_fixture_launcher


SCRIPTS = Path(__file__).resolve().parents[2] / "scripts" / "desktop-update"
FAKE_CLI = """
import json
import os
from pathlib import Path
import sys

def main():
    if '--version' in sys.argv:
        print('Install directory: ' + os.environ.get('HANDOFF_FOREIGN', str(Path(__file__).resolve().parents[1]))); return 0
    if '--help' in sys.argv:
        print('update options')
        sys.exit(0)
    receipt = Path(os.environ['HANDOFF_CAPTURE'])
    previous = receipt.read_text(encoding='utf-8') if receipt.exists() else ''
    with receipt.open('a', encoding='utf-8') as stream:
        stream.write(json.dumps({'argv': sys.argv[1:], 'home': os.environ.get('HERMES_HOME'),
                                 'install_root': os.environ.get('HERMES_INSTALL_ROOT'),
                                 'cwd': os.getcwd()}) + '\\n')
    print('Desktop build failed') if os.environ.get('HANDOFF_EXIT') else None
    sys.exit(int(os.environ['HANDOFF_EXIT']) if 'HANDOFF_EXIT' in os.environ else (1 if not previous else 0))

if __name__ == '__main__':
    main()
"""


def _run_handoff(tmp_path, target, *, windows=False, inherited_home=True, modern=False, code=0, userbin_only=False, foreign=False):
    install = tmp_path / "checkout with spaces"
    if windows and not modern:
        subprocess.run(
            [sys.executable, "-m", "venv", "--without-pip", str(install / "venv")],
            check=True,
            capture_output=True,
            timeout=60,
        )
    package = (
        install / "venv" / "Lib" / "site-packages" if windows and not modern else install
    ) / "hermes_cli"
    package.mkdir(parents=True)
    (package / "__init__.py").touch()
    (package / "main.py").write_text(FAKE_CLI, encoding="utf-8")
    if modern:
        launcher = publish_fixture_launcher(install, FAKE_CLI)
        if userbin_only:
            userbin = tmp_path / '.local/bin'
            userbin.mkdir(parents=True)
            launcher.rename(userbin / launcher.name)
    capture = tmp_path / "calls.jsonl"
    home = tmp_path / "profile home" if inherited_home else tmp_path
    home.mkdir(exist_ok=True)
    env = {
        **os.environ,
        "HOME": str(tmp_path),
        "TMPDIR": str(tmp_path),
        "HERMES_INSTALL_ROOT": str(install),
        "HANDOFF_CAPTURE": str(capture),
    }
    env.pop("PYTHONPATH", None)
    env.pop("PYTHONHOME", None)
    env.pop("HERMES_HOME", None)
    if inherited_home:
        env["HERMES_HOME"] = str(home)
    if modern:
        env["HANDOFF_EXIT"] = str(code)
        if foreign:
            env["HANDOFF_FOREIGN"] = str(tmp_path)
        env["HERMES_RUNTIME_DIR"] = str(tmp_path / "empty-store")
    if windows:
        # The disposable runtime has only the fixture CLI; verification is outside
        # this transport contract and runs its own harmless fixture implementation.
        (package / "desktop_update_verify.py").write_text(
            "def verify_windows_desktop_update(): pass\n",
            encoding="utf-8",
        )
        command = [
            "powershell",
            "-NoProfile",
            "-ExecutionPolicy",
            "Bypass",
            "-File",
            str(SCRIPTS / "windows.ps1"),
            "-InstallRoot",
            str(install),
            "-NoUi",
        ]
    else:
        if not modern:
            bin_dir = install / "venv" / "bin"
            bin_dir.mkdir(parents=True)
            (bin_dir / "python3").symlink_to(sys.executable)
            hermes = bin_dir / "hermes"
            hermes.write_text(
                f'#!/usr/bin/env bash\nexec {shlex.quote(sys.executable)} -m hermes_cli.main "$@"\n',
                encoding="utf-8",
            )
            hermes.chmod(0o755)
        command = [
            "bash",
            str(SCRIPTS / "posix.sh"),
            "--install-root",
            str(install),
            "--daemonized",
            "--no-ui",
        ]
    result = subprocess.run(
        [*command, *target],
        env=env,
        cwd=tmp_path,
        capture_output=True,
        text=True,
        encoding="utf-8",
        timeout=90,
    )
    calls = (
        [json.loads(line) for line in capture.read_text(encoding="utf-8").splitlines()]
        if capture.exists()
        else []
    )
    return result, calls, home, install


def _assert_forwarded(
    tmp_path, target, expected, *, windows=False, inherited_home=True
):
    result, calls, home, install = _run_handoff(
        tmp_path,
        target,
        windows=windows,
        inherited_home=inherited_home,
    )
    assert result.returncode == 0, result.stdout + result.stderr
    expected_args = ["update", "--yes", "--gateway"]
    if windows:
        expected_args += ["--force"]
    expected_args += expected
    expected_argvs = [expected_args] * 2
    if windows:
        # Desktop stopped the local gateways before handing off; a verified
        # update restores the whole fleet in the same home and install.
        expected_argvs.append(["gateway", "start", "--all"])
    assert calls == [
        {
            "argv": argv,
            "home": str(home),
            "cwd": str(install),
            "install_root": str(install),
        }
        for argv in expected_argvs
    ], calls
    receipt = json.loads(
        (home / ".hermes-update-result.json").read_text(encoding="utf-8-sig")
    )
    assert receipt["ok"]
    assert receipt["channel"] == (expected[1] if expected[0] == "--channel" else "")
    assert not (home / ".hermes-update-in-progress").exists()


@pytest.mark.platforms("posix")
@pytest.mark.parametrize("channel", ["stable", "canary", "main"])
def test_posix_channel_survives_retry_in_active_profile(tmp_path, channel):
    _assert_forwarded(tmp_path, ["--channel", channel], ["--channel", channel])


@pytest.mark.platforms("windows")
@pytest.mark.parametrize("channel", ["stable", "canary", "main"])
def test_windows_channel_survives_retry_in_active_profile(tmp_path, channel):
    _assert_forwarded(
        tmp_path, ["-Channel", channel], ["--channel", channel], windows=True
    )


@pytest.mark.platforms("posix")
@pytest.mark.parametrize(
    "target, expected",
    [
        ([], ["--branch", "main"]),
        (["--branch", "feature/target"], ["--branch", "feature/target"]),
    ],
)
def test_posix_legacy_branch_and_default_home(tmp_path, target, expected):
    _assert_forwarded(tmp_path, target, expected, inherited_home=False)


@pytest.mark.platforms("windows")
@pytest.mark.parametrize(
    "target, expected",
    [
        ([], ["--branch", "main"]),
        (["-Branch", "feature/target"], ["--branch", "feature/target"]),
    ],
)
def test_windows_legacy_branch_and_default_home(tmp_path, target, expected):
    _assert_forwarded(tmp_path, target, expected, windows=True, inherited_home=False)


def _assert_rejected(tmp_path, target, *, windows=False):
    result, calls, home, _ = _run_handoff(tmp_path, target, windows=windows)
    assert result.returncode != 0, result.stdout + result.stderr
    assert not calls
    assert not (home / ".hermes-update-in-progress").exists()
    assert not (home / ".hermes-update-result.json").exists()


@pytest.mark.platforms("posix")
@pytest.mark.parametrize(
    "target",
    [
        ["--channel", "nightly"],
        ["--channel", ""],
        ["--channel"],
        ["--branch", "main", "--channel", "stable"],
        ["--channel", "canary", "--branch", "main"],
    ],
)
def test_posix_rejects_invalid_or_conflicting_target_before_update(tmp_path, target):
    _assert_rejected(tmp_path, target)


@pytest.mark.platforms("windows")
@pytest.mark.parametrize(
    "target",
    [
        ["-Channel", "nightly"],
        ["-Channel", ""],
        ["-Channel"],
        ["-Branch", "main", "-Channel", "stable"],
        ["-Channel", "canary", "-Branch", "main"],
    ],
)
def test_windows_rejects_invalid_or_conflicting_target_before_update(tmp_path, target):
    _assert_rejected(tmp_path, target, windows=True)


@pytest.mark.platforms("posix")
@pytest.mark.parametrize("code", [0, 1, 2])
def test_pm_handoff_uses_published_launcher_and_does_not_retry(tmp_path, code):
    result, calls, home, install = _run_handoff(tmp_path, ["--channel", "canary"], modern=True, code=code)
    assert result.returncode == code, result.stdout + result.stderr
    assert calls == [{"argv": ["update", "--yes", "--gateway", "--channel", "canary"],
                      "home": str(home), "cwd": str(install), "install_root": str(install)}]
    receipt = json.loads((home / ".hermes-update-result.json").read_text())
    assert receipt["ok"] == (code == 0)
    assert not (install / "venv").exists()


@pytest.mark.platforms("posix")
@pytest.mark.parametrize("foreign", [False, True])
def test_earlier_pm_userbin_publication_requires_exact_source_identity(tmp_path, foreign):
    result, calls, home, install = _run_handoff(tmp_path, [], modern=True, userbin_only=True, foreign=foreign)
    assert result.returncode == (3 if foreign else 0), result.stdout + result.stderr
    assert len(calls) == (0 if foreign else 1)
    assert not (install / '.hermes/bin/hermes').exists()
    assert not (install / 'venv').exists()