"""Tests for the background app-install runner.

Same shape as test_catalog.py / test_updater.py: fixture reloads the
module with env-overridden paths, dockerops calls are stubbed so nothing
touches a real daemon. Asserts that state transitions happen in the
right order and that exceptions flip the state to "error" with the
message before re-raising.
"""

from __future__ import annotations

import json
from pathlib import Path

import pytest


@pytest.fixture
def runner(tmp_path, monkeypatch):
    apps = tmp_path / "apps"
    apps.mkdir()
    monkeypatch.setenv("FURTKA_APPS_DIR", str(apps))
    monkeypatch.setenv("FURTKA_INSTALL_STATE", str(tmp_path / "install-state.json"))
    monkeypatch.setenv("FURTKA_INSTALL_LOCK", str(tmp_path / "install.lock"))

    import importlib

    from furtka import install_runner as r
    from furtka import paths as p

    importlib.reload(p)
    importlib.reload(r)
    return r


def _write_installed_app(apps_dir: Path, name: str = "fileshare"):
    app = apps_dir / name
    app.mkdir()
    manifest = {
        "name": name,
        "display_name": "Fileshare",
        "version": "0.1.0",
        "description": "Test fixture",
        "volumes": ["files"],
        "ports": [445],
        "icon": "icon.svg",
    }
    (app / "manifest.json").write_text(json.dumps(manifest))
    (app / "docker-compose.yaml").write_text("services: {}\n")
    return app


def test_write_and_read_state_round_trip(runner):
    runner.write_state("pulling_image", app="jellyfin")
    s = runner.read_state()
    assert s["stage"] == "pulling_image"
    assert s["app"] == "jellyfin"
    assert "updated_at" in s


def test_read_state_returns_empty_when_missing(runner):
    assert runner.read_state() == {}


def test_read_state_returns_empty_on_junk(runner):
    runner.state_path().parent.mkdir(parents=True, exist_ok=True)
    runner.state_path().write_text("{not json")
    assert runner.read_state() == {}


def test_acquire_lock_prevents_concurrent_runs(runner):
    held = runner.acquire_lock()
    try:
        with pytest.raises(runner.InstallRunnerError, match="in progress"):
            runner.acquire_lock()
    finally:
        held.close()


def test_run_install_happy_path(runner, monkeypatch):
    import furtka.dockerops as dockerops
    from furtka.paths import apps_dir

    _write_installed_app(apps_dir(), "fileshare")

    calls = []
    monkeypatch.setattr(dockerops, "compose_pull", lambda *a, **k: calls.append(("pull", a)))
    monkeypatch.setattr(dockerops, "ensure_volume", lambda name: calls.append(("vol", name)))
    monkeypatch.setattr(dockerops, "compose_up", lambda *a, **k: calls.append(("up", a)))

    runner.run_install("fileshare")

    # Ordering: pull first, then volumes, then up.
    assert [c[0] for c in calls] == ["pull", "vol", "up"]
    # Exactly the namespaced volume name got created.
    assert calls[1] == ("vol", "furtka_fileshare_files")
    # Final state is "done" with the manifest version.
    s = runner.read_state()
    assert s["stage"] == "done"
    assert s["app"] == "fileshare"
    assert s["version"] == "0.1.0"


def test_run_install_writes_error_on_pull_failure(runner, monkeypatch):
    import furtka.dockerops as dockerops
    from furtka.paths import apps_dir

    _write_installed_app(apps_dir(), "fileshare")

    def boom(*a, **k):
        raise dockerops.DockerError("pull failed: registry unreachable")

    monkeypatch.setattr(dockerops, "compose_pull", boom)
    monkeypatch.setattr(dockerops, "ensure_volume", lambda name: None)
    monkeypatch.setattr(dockerops, "compose_up", lambda *a, **k: None)

    with pytest.raises(dockerops.DockerError):
        runner.run_install("fileshare")

    s = runner.read_state()
    assert s["stage"] == "error"
    assert s["app"] == "fileshare"
    assert "registry unreachable" in s["error"]


def test_run_install_writes_error_on_up_failure(runner, monkeypatch):
    import furtka.dockerops as dockerops
    from furtka.paths import apps_dir

    _write_installed_app(apps_dir(), "fileshare")

    monkeypatch.setattr(dockerops, "compose_pull", lambda *a, **k: None)
    monkeypatch.setattr(dockerops, "ensure_volume", lambda name: None)

    def boom(*a, **k):
        raise dockerops.DockerError("compose up: container refused to start")

    monkeypatch.setattr(dockerops, "compose_up", boom)

    with pytest.raises(dockerops.DockerError):
        runner.run_install("fileshare")

    s = runner.read_state()
    assert s["stage"] == "error"
    assert "refused to start" in s["error"]


def test_run_install_releases_lock_after_done(runner, monkeypatch):
    import furtka.dockerops as dockerops
    from furtka.paths import apps_dir

    _write_installed_app(apps_dir(), "fileshare")
    monkeypatch.setattr(dockerops, "compose_pull", lambda *a, **k: None)
    monkeypatch.setattr(dockerops, "ensure_volume", lambda name: None)
    monkeypatch.setattr(dockerops, "compose_up", lambda *a, **k: None)

    runner.run_install("fileshare")

    # Lock released — a fresh acquire must succeed.
    fh = runner.acquire_lock()
    fh.close()


def test_run_install_releases_lock_after_error(runner, monkeypatch):
    import furtka.dockerops as dockerops
    from furtka.paths import apps_dir

    _write_installed_app(apps_dir(), "fileshare")
    monkeypatch.setattr(
        dockerops, "compose_pull", lambda *a, **k: (_ for _ in ()).throw(dockerops.DockerError("x"))
    )

    with pytest.raises(dockerops.DockerError):
        runner.run_install("fileshare")

    fh = runner.acquire_lock()
    fh.close()