package service

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

func kubeClientFactoryForURL(baseURL string, client *http.Client) *kubeClient {
	return &kubeClient{
		baseURL: baseURL,
		token:   "test-token",
		client:  client,
	}
}

func installKubeFactory(t *testing.T, baseURL string, client *http.Client) {
	t.Helper()
	origFactory := kubeClientFactory
	kubeClientFactory = func() (*kubeClient, error) {
		return kubeClientFactoryForURL(baseURL, client), nil
	}
	t.Cleanup(func() {
		kubeClientFactory = origFactory
	})
}

func TestClusterActiveRemotePodLoadsCountsOnlyLivePods(t *testing.T) {
	kube := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet || r.URL.Path != "/api/v1/namespaces/maintenance/pods" {
			http.NotFound(w, r)
			return
		}
		if got := r.URL.Query().Get("labelSelector"); got != "app=metis-remote,metis-run=build" {
			t.Fatalf("unexpected labelSelector %q", got)
		}
		_ = json.NewEncoder(w).Encode(map[string]any{
			"items": []any{
				map[string]any{
					"metadata": map[string]any{"labels": map[string]string{"app": "metis-remote", "metis-run": "build"}},
					"spec":     map[string]any{"nodeName": "titan-04"},
					"status":   map[string]any{"phase": "Running"},
				},
				map[string]any{
					"metadata": map[string]any{"labels": map[string]string{"app": "metis-remote", "metis-run": "build"}},
					"spec":     map[string]any{"nodeName": "titan-04"},
					"status":   map[string]any{"phase": "Pending"},
				},
				map[string]any{
					"metadata": map[string]any{"labels": map[string]string{"app": "metis-remote", "metis-run": "build"}},
					"spec":     map[string]any{"nodeName": "titan-05"},
					"status":   map[string]any{"phase": "Succeeded"},
				},
			},
		})
	}))
	defer kube.Close()

	installKubeFactory(t, kube.URL, kube.Client())

	loads := clusterActiveRemotePodLoads("maintenance", "build")
	if loads["titan-04"] != 2 {
		t.Fatalf("expected titan-04 load 2, got %#v", loads)
	}
	if _, ok := loads["titan-05"]; ok {
		t.Fatalf("expected succeeded pod to be ignored, got %#v", loads)
	}
}

func TestSelectBuilderHostAvoidsBusyBuilderWhenPeersAreFree(t *testing.T) {
	kube := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == http.MethodGet && r.URL.Path == "/api/v1/nodes":
			_ = json.NewEncoder(w).Encode(map[string]any{
				"items": []any{
					map[string]any{
						"metadata": map[string]any{
							"name": "titan-04",
							"labels": map[string]string{
								"kubernetes.io/arch":             "arm64",
								"hardware":                       "rpi5",
								"node-role.kubernetes.io/worker": "true",
							},
						},
						"spec": map[string]any{"unschedulable": false},
					},
					map[string]any{
						"metadata": map[string]any{
							"name": "titan-05",
							"labels": map[string]string{
								"kubernetes.io/arch":             "arm64",
								"hardware":                       "rpi5",
								"node-role.kubernetes.io/worker": "true",
							},
						},
						"spec": map[string]any{"unschedulable": false},
					},
				},
			})
		case r.Method == http.MethodGet && r.URL.Path == "/api/v1/namespaces/maintenance/pods":
			selector := r.URL.Query().Get("labelSelector")
			var items []any
			switch selector {
			case "app=metis-remote,metis-run=build":
				items = []any{
					map[string]any{
						"metadata": map[string]any{"labels": map[string]string{"app": "metis-remote", "metis-run": "build"}},
						"spec":     map[string]any{"nodeName": "titan-04"},
						"status":   map[string]any{"phase": "Running"},
					},
				}
			case "app=metis-remote":
				items = []any{
					map[string]any{
						"metadata": map[string]any{"labels": map[string]string{"app": "metis-remote", "metis-run": "build"}},
						"spec":     map[string]any{"nodeName": "titan-04"},
						"status":   map[string]any{"phase": "Running"},
					},
				}
			default:
				t.Fatalf("unexpected labelSelector %q", selector)
			}
			_ = json.NewEncoder(w).Encode(map[string]any{"items": items})
		default:
			http.NotFound(w, r)
		}
	}))
	defer kube.Close()

	installKubeFactory(t, kube.URL, kube.Client())

	app := newTestApp(t)
	app.settings.Namespace = "maintenance"
	node, err := app.selectBuilderHost("arm64", "")
	if err != nil {
		t.Fatalf("selectBuilderHost: %v", err)
	}
	if node.Name != "titan-05" {
		t.Fatalf("expected titan-05 builder, got %s", node.Name)
	}
}