from __future__ import annotations

import pytest

from knoe.core.ops import storage as storage_ops


def test_build_cluster_storage_paths_prefers_distinct_roots(monkeypatch):
    monkeypatch.setattr(
        storage_ops,
        "_is_non_root_mount",
        lambda path, **_kwargs: str(path) in {"/synology/d001", "/synology/d002"},
    )

    spec = storage_ops.ClusterStorageSpec(
        namespace="knoe-db",
        cluster_name="cluster-a",
        node_name="myrddin.knoe.org",
        synology_roots=("/synology/d001", "/synology/d002"),
    )

    paths = storage_ops.build_cluster_storage_paths(spec)

    assert paths.data_root != paths.wal_root
    assert paths.data_path.endswith("/knoe/knoe-db/knoe-db/cluster-a/data")
    assert paths.wal_path.endswith("/knoe/knoe-db/knoe-db/cluster-a/wal")


def test_build_cluster_storage_paths_falls_back_to_same_root(monkeypatch):
    monkeypatch.setattr(
        storage_ops,
        "_is_non_root_mount",
        lambda path, **_kwargs: str(path) == "/synology/d001",
    )

    spec = storage_ops.ClusterStorageSpec(
        namespace="knoe-db",
        cluster_name="cluster-a",
        node_name="myrddin.knoe.org",
        synology_roots=("/synology/d001", "/synology/d002"),
    )

    paths = storage_ops.build_cluster_storage_paths(spec)

    assert paths.data_root == "/synology/d001"
    assert paths.wal_root == "/synology/d001"
    assert paths.data_path != paths.wal_path


def test_build_pv_labels_include_cluster_scope():
    labels = storage_ops.build_pv_labels(
        namespace="knoe-db",
        cluster_name="cluster-a",
        role="data",
        volume="d001",
    )

    assert labels["synology.storage/role"] == "data"
    assert labels["synology.storage/volume"] == "d001"
    assert labels["knoe.io/namespace"] == "knoe-db"
    assert labels["knoe.io/cluster"] == "cluster-a"
    assert labels["knoe.io/service"] == "knoe-db"


def test_provision_cluster_storage_fails_on_existing_name_mismatch(monkeypatch):
    spec = storage_ops.ClusterStorageSpec(
        namespace="knoe-db",
        cluster_name="cluster-a",
        node_name="myrddin.knoe.org",
    )
    paths = storage_ops.ClusterStoragePaths(
        data_root="/synology/d001",
        wal_root="/synology/d002",
        data_volume="d001",
        wal_volume="d002",
        data_path="/synology/d001/knoe/knoe-db/knoe-db/cluster-a/data",
        wal_path="/synology/d002/knoe/knoe-db/knoe-db/cluster-a/wal",
    )

    data_name = storage_ops.build_pv_name("synology-iscsi", "knoe-db", "cluster-a", "data")
    monkeypatch.setattr(storage_ops, "build_cluster_storage_paths", lambda _spec: paths)
    monkeypatch.setattr(storage_ops, "ensure_host_path", lambda *args, **kwargs: None)

    existing = {
        data_name: {
            "metadata": {
                "name": data_name,
                "labels": storage_ops.build_pv_labels(
                    namespace="knoe-db",
                    cluster_name="cluster-a",
                    role="data",
                    volume="d001",
                ),
            },
            "spec": {
                "storageClassName": "synology-iscsi",
                "local": {"path": "/synology/d001/other-path"},
                "nodeAffinity": {
                    "required": {
                        "nodeSelectorTerms": [
                            {
                                "matchExpressions": [
                                    {
                                        "key": "kubernetes.io/hostname",
                                        "operator": "In",
                                        "values": ["myrddin.knoe.org"],
                                    }
                                ]
                            }
                        ]
                    }
                },
            },
        }
    }
    monkeypatch.setattr(storage_ops, "_collect_existing_pvs", lambda _spec: existing)

    with pytest.raises(storage_ops.StorageProvisioningError, match="unexpected path"):
        storage_ops.provision_cluster_storage(spec)


def test_provision_cluster_storage_applies_and_returns_selectors(monkeypatch):
    spec = storage_ops.ClusterStorageSpec(
        namespace="knoe-db",
        cluster_name="cluster-a",
        node_name="myrddin.knoe.org",
    )
    paths = storage_ops.ClusterStoragePaths(
        data_root="/synology/d001",
        wal_root="/synology/d002",
        data_volume="d001",
        wal_volume="d002",
        data_path="/synology/d001/knoe/knoe-db/knoe-db/cluster-a/data",
        wal_path="/synology/d002/knoe/knoe-db/knoe-db/cluster-a/wal",
    )

    monkeypatch.setattr(storage_ops, "build_cluster_storage_paths", lambda _spec: paths)
    monkeypatch.setattr(storage_ops, "_ensure_node_host_path", lambda *args, **kwargs: None)
    monkeypatch.setattr(storage_ops, "ensure_host_path", lambda *args, **kwargs: None)
    monkeypatch.setattr(storage_ops, "_collect_existing_pvs", lambda _spec: {})

    applied: list[dict] = []

    def _capture_apply(_spec, manifest):
        applied.append(manifest)

    monkeypatch.setattr(storage_ops, "_kubectl_apply_manifest", _capture_apply)

    provisioned = storage_ops.provision_cluster_storage(spec)

    assert len(applied) == 2
    assert provisioned.data_pv_name == "synology-iscsi-knoe-db-cluster-a-data"
    assert provisioned.wal_pv_name == "synology-iscsi-knoe-db-cluster-a-wal"
    assert provisioned.data_selector["knoe.io/namespace"] == "knoe-db"
    assert provisioned.data_selector["knoe.io/cluster"] == "cluster-a"
    assert provisioned.wal_selector["synology.storage/role"] == "wal"


def test_provision_cluster_storage_fails_on_path_overlap(monkeypatch):
    spec = storage_ops.ClusterStorageSpec(
        namespace="knoe-db",
        cluster_name="cluster-a",
        node_name="myrddin.knoe.org",
    )
    paths = storage_ops.ClusterStoragePaths(
        data_root="/synology/d001",
        wal_root="/synology/d002",
        data_volume="d001",
        wal_volume="d002",
        data_path="/synology/d001/knoe/knoe-db/knoe-db/cluster-a/data",
        wal_path="/synology/d002/knoe/knoe-db/knoe-db/cluster-a/wal",
    )

    monkeypatch.setattr(storage_ops, "build_cluster_storage_paths", lambda _spec: paths)
    monkeypatch.setattr(storage_ops, "ensure_host_path", lambda *args, **kwargs: None)

    existing = {
        "some-other-pv": {
            "metadata": {"name": "some-other-pv", "labels": {}},
            "spec": {
                "storageClassName": "synology-iscsi",
                "local": {"path": "/synology/d001/knoe/knoe-db/knoe-db/cluster-a"},
                "nodeAffinity": {"required": {"nodeSelectorTerms": []}},
            },
        }
    }
    monkeypatch.setattr(storage_ops, "_collect_existing_pvs", lambda _spec: existing)

    with pytest.raises(storage_ops.StorageProvisioningError, match="overlap"):
        storage_ops.provision_cluster_storage(spec)