package api

import (
	"context"
	"testing"

	"felis.lolicon.best/internal/apis/felis/v1alpha1"
	"felis.lolicon.best/internal/naming"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/types"
	"sigs.k8s.io/controller-runtime/pkg/client/fake"
)

// K8sCluster is documented as integration-tested against a live cluster rather
// than covered by the hermetic suite, and for most of it that is the right call —
// merge-patch semantics are not worth faking. This one test departs from it
// deliberately: "CreateServer forgot to set spec.rcon" is precisely the kind of
// defect a live-cluster test catches only if someone runs it, and it shipped. It
// produced servers that reported Running, listed nobody online, and answered the
// console with 503, and the cause was a struct literal missing a field. A fake
// client is enough to pin a struct literal.
func TestCreateServerEnablesRcon(t *testing.T) {
	scheme := runtime.NewScheme()
	if err := v1alpha1.AddToScheme(scheme); err != nil {
		t.Fatalf("scheme: %v", err)
	}
	c := fake.NewClientBuilder().WithScheme(scheme).Build()
	k := NewK8sCluster(c, "minecraft")

	if err := k.CreateServer(context.Background(), CreateServerInput{
		Name:        "survival",
		Subdomain:   "survival",
		DisplayName: "Survival",
		Image:       "reg/paper:1",
		JavaMemory:  "2G",
		StorageSize: "10Gi",
	}); err != nil {
		t.Fatalf("CreateServer: %v", err)
	}

	var ms v1alpha1.MinecraftServer
	if err := c.Get(context.Background(),
		types.NamespacedName{Namespace: "minecraft", Name: "survival"}, &ms); err != nil {
		t.Fatalf("get created server: %v", err)
	}

	if !ms.Spec.Rcon.Enabled {
		t.Fatal("spec.rcon.enabled is false: the operator will skip the readiness probe and " +
			"never sample a player count, and every console write will fail with 503")
	}
	// The name is the contract with internal/operator.ensureRconSecret, which
	// provisions the password against exactly this key. A mismatch leaves the pod
	// stuck on a secretKeyRef that nothing ever creates.
	if got, want := ms.Spec.Rcon.SecretRef.Name, naming.RconSecretName("survival"); got != want {
		t.Fatalf("rcon secretRef name = %q, want %q", got, want)
	}
	if got, want := ms.Spec.Rcon.SecretRef.Key, naming.RconSecretKey; got != want {
		t.Fatalf("rcon secretRef key = %q, want %q", got, want)
	}
	// felis-api holds secrets:get, not create — it must never try to mint the
	// password itself, and nothing here should carry one.
	if ms.Spec.Rcon.Port != 0 {
		t.Fatalf("rcon port = %d, want 0 so the operator default is the only copy", ms.Spec.Rcon.Port)
	}
}

// TestCreateServerDefaultsIdleStop pins the other half of "a server nobody plays
// on stops itself": the operator only idles out a server whose spec asks for
// it, so a create that leaves spec.idle empty ships a server that runs forever.
func TestCreateServerDefaultsIdleStop(t *testing.T) {
	scheme := runtime.NewScheme()
	if err := v1alpha1.AddToScheme(scheme); err != nil {
		t.Fatalf("scheme: %v", err)
	}
	c := fake.NewClientBuilder().WithScheme(scheme).Build()
	k := NewK8sCluster(c, "minecraft")
	if err := k.CreateServer(context.Background(), CreateServerInput{
		Name: "survival", Subdomain: "survival", Image: "reg/paper:1", JavaMemory: "2G", StorageSize: "10Gi",
	}); err != nil {
		t.Fatalf("CreateServer: %v", err)
	}
	info, err := k.GetServer(context.Background(), "survival")
	if err != nil {
		t.Fatalf("GetServer: %v", err)
	}
	if info.IdleStopSeconds != v1alpha1.DefaultEmptySecondsBeforeStop {
		t.Fatalf("idleStopSeconds = %d, want the default %d", info.IdleStopSeconds, v1alpha1.DefaultEmptySecondsBeforeStop)
	}
}

// TestPatchIdleStopKeepsTheChoiceVisible: turning idle stop off must leave a
// duration on the spec, because a spec with none at all is what converge fills
// with the default. Off followed by a converge must stay off.
func TestPatchIdleStopKeepsTheChoiceVisible(t *testing.T) {
	scheme := runtime.NewScheme()
	if err := v1alpha1.AddToScheme(scheme); err != nil {
		t.Fatalf("scheme: %v", err)
	}
	legacy := &v1alpha1.MinecraftServer{}
	legacy.Name, legacy.Namespace = "survival", "minecraft"
	legacy.Spec.Rcon.Enabled = true
	c := fake.NewClientBuilder().WithScheme(scheme).WithObjects(legacy).Build()
	k := NewK8sCluster(c, "minecraft")
	get := func() v1alpha1.IdleSpec {
		var ms v1alpha1.MinecraftServer
		if err := c.Get(context.Background(), types.NamespacedName{Namespace: "minecraft", Name: "survival"}, &ms); err != nil {
			t.Fatalf("get: %v", err)
		}
		return ms.Spec.Idle
	}

	off := int32(0)
	if err := k.PatchServerSpec(context.Background(), "survival", ServerSpecPatch{IdleStopSeconds: &off}); err != nil {
		t.Fatalf("patch off: %v", err)
	}
	if got := get(); got.AutoStopEnabled || got.EmptySecondsBeforeStop <= 0 {
		t.Fatalf("idle after off = %+v, want disabled with a duration kept", got)
	}

	thirty := int32(1800)
	if err := k.PatchServerSpec(context.Background(), "survival", ServerSpecPatch{IdleStopSeconds: &thirty}); err != nil {
		t.Fatalf("patch on: %v", err)
	}
	if got := get(); !got.AutoStopEnabled || got.EmptySecondsBeforeStop != 1800 {
		t.Fatalf("idle after 1800 = %+v, want enabled at 1800", got)
	}
	info, err := k.GetServer(context.Background(), "survival")
	if err != nil {
		t.Fatalf("GetServer: %v", err)
	}
	if info.IdleStopSeconds != 1800 {
		t.Fatalf("view idleStopSeconds = %d, want 1800", info.IdleStopSeconds)
	}
}