from pathlib import Path
import sys
import pytest

PROJECT_ROOT = Path(__file__).resolve().parents[2]
if str(PROJECT_ROOT) not in sys.path:
    sys.path.insert(0, str(PROJECT_ROOT))

from subprocess import CompletedProcess

from knoe.core.ops import gke_clusters


def test_build_kubectl_env_for_cluster_sets_explicit_role_and_context():
    env = gke_clusters.build_kubectl_env_for_cluster(
        base_env={"EXISTING": "1"},
        kubecontext="ctx-app",
        cluster_name="knoe-dev-0",
        cluster_role="app",
    )

    assert env["EXISTING"] == "1"
    assert env["KUBECTL_CONTEXT"] == "ctx-app"
    assert env["CLUSTER_NAME"] == "knoe-dev-0"
    assert env["KNOE_CLUSTER_ROLE"] == "app"
    assert env["KNOE_APP_CLUSTER_NAME"] == "knoe-dev-0"


def test_build_kubectl_env_for_cluster_requires_explicit_context_when_missing():
    with pytest.raises(ValueError, match="Missing required kube context"):
        gke_clusters.build_kubectl_env_for_cluster(
            base_env={},
            kubecontext="",
            cluster_name="knoe-dev-0",
            cluster_role="app",
        )


def test_build_kubectl_env_for_cluster_rejects_mismatched_required_role_context():
    with pytest.raises(ValueError, match="expected APP_CLUSTER_KUBECONTEXT"):
        gke_clusters.build_kubectl_env_for_cluster(
            base_env={"APP_CLUSTER_KUBECONTEXT": "ctx-app"},
            kubecontext="ctx-other",
            cluster_name="knoe-dev-0",
            cluster_role="app",
        )


def test_build_kubectl_env_for_cluster_rejects_cross_role_context_usage():
    with pytest.raises(ValueError, match="matches DB_CLUSTER_KUBECONTEXT"):
        gke_clusters.build_kubectl_env_for_cluster(
            base_env={
                "APP_CLUSTER_KUBECONTEXT": "ctx-app",
                "DB_CLUSTER_KUBECONTEXT": "ctx-db",
            },
            kubecontext="ctx-db",
            cluster_name="knoe-dev-0",
            cluster_role="app",
        )


def test_get_cluster_credentials_builds_expected_gcloud_command(monkeypatch):
    called = {}

    def fake_run(cmd, capture_output, text):
        called["cmd"] = cmd
        return CompletedProcess(cmd, 0, stdout="", stderr="")

    monkeypatch.setattr(gke_clusters.subprocess, "run", fake_run)

    context = gke_clusters.get_cluster_credentials(
        project_id="proj-1",
        cluster_name="knoe-cnpg-0",
        location="us-central1",
    )

    assert context == "gke_proj-1_us-central1_knoe-cnpg-0"
    assert called["cmd"] == [
        "gcloud",
        "container",
        "clusters",
        "get-credentials",
        "knoe-cnpg-0",
        "--project",
        "proj-1",
        "--region",
        "us-central1",
        "--quiet",
    ]


def test_ensure_db_cluster_creates_standard_cluster_with_db_node_labels(monkeypatch):
    commands = []

    def fake_run(cmd, log=None):
        commands.append(cmd)
        if cmd[:4] == ["gcloud", "container", "clusters", "describe"]:
            return CompletedProcess(cmd, 1, stdout="", stderr="not found")
        return CompletedProcess(cmd, 0, stdout="created", stderr="")

    monkeypatch.setattr(gke_clusters, "_run", fake_run)

    spec = gke_clusters.GkeClusterSpec(
        name="knoe-cnpg-0",
        mode="standard",
        location="us-central1",
        machine_type="e2-small",
        node_count=1,
        node_pool_name="cnpg-db-pool",
    )

    gke_clusters.ensure_db_cluster(project_id="proj-1", spec=spec)

    create_cmd = commands[-1]
    assert create_cmd[:5] == ["gcloud", "container", "clusters", "create", "knoe-cnpg-0"]
    assert "--num-nodes" in create_cmd
    assert create_cmd[create_cmd.index("--num-nodes") + 1] == "1"
    assert "--node-labels" in create_cmd
    assert create_cmd[create_cmd.index("--node-labels") + 1] == "workload=db"


def test_ensure_db_cluster_existing_cluster_adds_labeled_db_pool(monkeypatch):
    commands = []

    def fake_run(cmd, log=None):
        commands.append(cmd)
        if cmd[:4] == ["gcloud", "container", "clusters", "describe"]:
            return CompletedProcess(cmd, 0, stdout="knoe-cnpg-0", stderr="")
        if cmd[:4] == ["gcloud", "container", "node-pools", "describe"]:
            return CompletedProcess(cmd, 1, stdout="", stderr="not found")
        return CompletedProcess(cmd, 0, stdout="ok", stderr="")

    monkeypatch.setattr(gke_clusters, "_run", fake_run)

    spec = gke_clusters.GkeClusterSpec(
        name="knoe-cnpg-0",
        mode="standard",
        location="us-central1-a",
        machine_type="e2-standard-2",
        node_count=3,
        node_pool_name="cnpg-db-pool",
    )

    gke_clusters.ensure_db_cluster(project_id="proj-1", spec=spec)

    create_pool_cmd = commands[-1]
    assert create_pool_cmd[:4] == ["gcloud", "container", "node-pools", "create"]
    assert create_pool_cmd[4] == "cnpg-db-pool"
    assert "--machine-type" in create_pool_cmd
    assert create_pool_cmd[create_pool_cmd.index("--machine-type") + 1] == "e2-standard-2"
    assert "--num-nodes" in create_pool_cmd
    assert create_pool_cmd[create_pool_cmd.index("--num-nodes") + 1] == "3"
    assert "--node-labels" in create_pool_cmd
    assert create_pool_cmd[create_pool_cmd.index("--node-labels") + 1] == "workload=db"