import json

import pytest

from furtka import dockerops, reconciler

VALID_MANIFEST = {
    "name": "fileshare",
    "display_name": "Network Files",
    "version": "0.1.0",
    "description": "SMB share",
    "volumes": ["files", "config"],
    "ports": [445],
    "icon": "icon.svg",
}


@pytest.fixture
def fake_docker(monkeypatch):
    """Replace dockerops with no-op recorders so reconcile() doesn't shell out."""
    calls: dict[str, list] = {"ensure_volume": [], "compose_up": [], "compose_down": []}
    existing_volumes: set[str] = set()

    def fake_ensure(name):
        calls["ensure_volume"].append(name)
        if name in existing_volumes:
            return False
        existing_volumes.add(name)
        return True

    def fake_compose_up(app_dir, project):
        calls["compose_up"].append((str(app_dir), project))

    def fake_compose_down(app_dir, project):
        calls["compose_down"].append((str(app_dir), project))

    monkeypatch.setattr(dockerops, "ensure_volume", fake_ensure)
    monkeypatch.setattr(dockerops, "compose_up", fake_compose_up)
    monkeypatch.setattr(dockerops, "compose_down", fake_compose_down)
    return calls


def _make_app(root, name, manifest=None):
    app = root / name
    app.mkdir(parents=True)
    if manifest is not None:
        (app / "manifest.json").write_text(json.dumps(manifest))
    (app / "docker-compose.yaml").write_text("services: {}\n")
    return app


def test_reconcile_empty_root(tmp_path, fake_docker):
    actions = reconciler.reconcile(tmp_path)
    assert actions == []
    assert fake_docker["ensure_volume"] == []
    assert fake_docker["compose_up"] == []


def test_reconcile_one_app(tmp_path, fake_docker):
    _make_app(tmp_path, "fileshare", VALID_MANIFEST)
    actions = reconciler.reconcile(tmp_path)
    assert [(a.kind, a.target) for a in actions] == [
        ("ensure_volume", "furtka_fileshare_files"),
        ("ensure_volume", "furtka_fileshare_config"),
        ("compose_up", "fileshare"),
    ]
    assert fake_docker["ensure_volume"] == [
        "furtka_fileshare_files",
        "furtka_fileshare_config",
    ]
    assert len(fake_docker["compose_up"]) == 1
    assert fake_docker["compose_up"][0][1] == "fileshare"


def test_reconcile_dry_run_does_not_act(tmp_path, fake_docker):
    _make_app(tmp_path, "fileshare", VALID_MANIFEST)
    actions = reconciler.reconcile(tmp_path, dry_run=True)
    assert len(actions) == 3
    assert fake_docker["ensure_volume"] == []
    assert fake_docker["compose_up"] == []


def test_reconcile_skips_broken_manifest(tmp_path, fake_docker):
    _make_app(tmp_path, "fileshare", VALID_MANIFEST)
    _make_app(tmp_path, "broken")  # no manifest
    actions = reconciler.reconcile(tmp_path)
    skip_actions = [a for a in actions if a.kind == "skip"]
    assert len(skip_actions) == 1
    assert skip_actions[0].target == "broken"
    # Healthy app still got reconciled.
    assert fake_docker["compose_up"] == [(str(tmp_path / "fileshare"), "fileshare")]


def test_reconcile_isolates_per_app_docker_failure(tmp_path, monkeypatch):
    """A docker error on one app must not block reconcile of the others."""
    _make_app(tmp_path, "alpha", dict(VALID_MANIFEST, name="alpha", volumes=["a"]))
    _make_app(tmp_path, "broken-app", dict(VALID_MANIFEST, name="broken-app", volumes=["b"]))
    _make_app(tmp_path, "zulu", dict(VALID_MANIFEST, name="zulu", volumes=["z"]))

    succeeded_compose: list[str] = []

    def fake_ensure(name):
        return True

    def fake_compose_up(app_dir, project):
        if project == "broken-app":
            raise dockerops.DockerError("simulated daemon failure")
        succeeded_compose.append(project)

    monkeypatch.setattr(dockerops, "ensure_volume", fake_ensure)
    monkeypatch.setattr(dockerops, "compose_up", fake_compose_up)

    actions = reconciler.reconcile(tmp_path)
    error_actions = [a for a in actions if a.kind == "error"]

    assert reconciler.has_errors(actions)
    assert len(error_actions) == 1
    assert error_actions[0].target == "broken-app"
    # Both healthy apps reconciled despite the broken one in the middle.
    assert succeeded_compose == ["alpha", "zulu"]


def test_reconcile_isolates_missing_docker_binary(tmp_path, monkeypatch):
    """No docker binary on the box still produces a tidy per-app error."""
    _make_app(tmp_path, "fileshare", VALID_MANIFEST)

    def boom(*args, **kwargs):
        raise FileNotFoundError("[Errno 2] No such file or directory: 'docker'")

    monkeypatch.setattr(dockerops, "ensure_volume", boom)
    actions = reconciler.reconcile(tmp_path)
    assert reconciler.has_errors(actions)
    error = next(a for a in actions if a.kind == "error")
    assert error.target == "fileshare"
    assert "docker" in error.detail