package k8s

import (
	"context"
	"testing"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"github.com/iliaivanov/spec-kit-remote/cmd/dev-pod-api/internal/model"
)

func defaultRunnerOpts() CreateRunnerPodOpts {
	return CreateRunnerPodOpts{
		User:               "alice",
		RunnerID:           "runner-abc12345",
		Tools:              "go,rust",
		Task:               "implement feature",
		RepoURL:            "alice/myrepo",
		Branch:             "main",
		CPUReq:             "2",
		MemReq:             "4Gi",
		ForgejoRunnerToken: "test-runner-token",
	}
}

func TestCreateRunnerPod(t *testing.T) {
	client := newTestClient()
	ctx := context.Background()

	if err := client.EnsureNamespace(ctx, "alice"); err != nil {
		t.Fatalf("ensure namespace: %v", err)
	}

	opts := defaultRunnerOpts()
	podName, err := client.CreateRunnerPod(ctx, opts)
	if err != nil {
		t.Fatalf("create runner pod: %v", err)
	}

	expectedPodName := model.RunnerPodName("runner-abc12345")
	if podName != expectedPodName {
		t.Errorf("expected pod name %q, got %q", expectedPodName, podName)
	}

	ns := model.NamespaceName("alice")
	pod, err := client.Clientset.CoreV1().Pods(ns).Get(ctx, podName, metav1.GetOptions{})
	if err != nil {
		t.Fatalf("get runner pod: %v", err)
	}

	if pod.Labels["app"] != "dev-pod-runner" {
		t.Errorf("expected app label dev-pod-runner, got %q", pod.Labels["app"])
	}
	if pod.Labels["runner-id"] != "runner-abc12345" {
		t.Errorf("expected runner-id label runner-abc12345, got %q", pod.Labels["runner-id"])
	}
	if pod.Labels["user"] != "alice" {
		t.Errorf("expected user label alice, got %q", pod.Labels["user"])
	}

	if len(pod.Spec.Containers) != 2 {
		t.Fatalf("expected 2 containers (runner + ipip-sidecar), got %d", len(pod.Spec.Containers))
	}

	container := pod.Spec.Containers[0]
	if container.Name != "runner" {
		t.Errorf("expected container name runner, got %q", container.Name)
	}

	sidecar := pod.Spec.Containers[1]
	if sidecar.Name != "ipip-sidecar" {
		t.Errorf("expected sidecar name ipip-sidecar, got %q", sidecar.Name)
	}
	if sidecar.SecurityContext == nil || !*sidecar.SecurityContext.Privileged {
		t.Error("expected ipip-sidecar to be privileged")
	}

	envMap := make(map[string]string)
	for _, e := range container.Env {
		envMap[e.Name] = e.Value
	}
	if envMap["RUNNER_MODE"] != "true" {
		t.Error("expected RUNNER_MODE=true")
	}
	if envMap["RUNNER_ID"] != "runner-abc12345" {
		t.Errorf("expected RUNNER_ID=runner-abc12345, got %q", envMap["RUNNER_ID"])
	}
	if envMap["DEV_POD_API_URL"] == "" {
		t.Error("expected DEV_POD_API_URL to be set")
	}
	if envMap["FORGEJO_RUNNER_TOKEN"] != "test-runner-token" {
		t.Errorf("expected FORGEJO_RUNNER_TOKEN=test-runner-token, got %q", envMap["FORGEJO_RUNNER_TOKEN"])
	}
	if envMap["RUNNER_REPO"] != "alice/myrepo" {
		t.Errorf("expected RUNNER_REPO=alice/myrepo, got %q", envMap["RUNNER_REPO"])
	}
	if envMap["RUNNER_BRANCH"] != "main" {
		t.Errorf("expected RUNNER_BRANCH=main, got %q", envMap["RUNNER_BRANCH"])
	}
	if envMap["DEV_TOOLS"] != "go,rust" {
		t.Errorf("expected DEV_TOOLS=go,rust, got %q", envMap["DEV_TOOLS"])
	}

	cpuReq := container.Resources.Requests.Cpu()
	if cpuReq.String() != "2" {
		t.Errorf("expected cpu request 2, got %s", cpuReq.String())
	}
	memReq := container.Resources.Requests.Memory()
	if memReq.String() != "4Gi" {
		t.Errorf("expected memory request 4Gi, got %s", memReq.String())
	}
}

func TestCreateRunnerPod_DefaultResources(t *testing.T) {
	client := newTestClient()
	ctx := context.Background()

	if err := client.EnsureNamespace(ctx, "alice"); err != nil {
		t.Fatalf("ensure namespace: %v", err)
	}

	opts := CreateRunnerPodOpts{
		User:     "alice",
		RunnerID: "runner-defaults",
		RepoURL:  "alice/repo",
	}
	podName, err := client.CreateRunnerPod(ctx, opts)
	if err != nil {
		t.Fatalf("create runner pod: %v", err)
	}

	ns := model.NamespaceName("alice")
	pod, err := client.Clientset.CoreV1().Pods(ns).Get(ctx, podName, metav1.GetOptions{})
	if err != nil {
		t.Fatalf("get runner pod: %v", err)
	}

	container := pod.Spec.Containers[0]
	cpuReq := container.Resources.Requests.Cpu()
	if cpuReq.String() != "2" {
		t.Errorf("expected default cpu request 2, got %s", cpuReq.String())
	}
	memReq := container.Resources.Requests.Memory()
	if memReq.String() != "4Gi" {
		t.Errorf("expected default memory request 4Gi, got %s", memReq.String())
	}
}

func TestDeleteRunnerPod(t *testing.T) {
	client := newTestClient()
	ctx := context.Background()

	if err := client.EnsureNamespace(ctx, "alice"); err != nil {
		t.Fatalf("ensure namespace: %v", err)
	}

	opts := defaultRunnerOpts()
	podName, err := client.CreateRunnerPod(ctx, opts)
	if err != nil {
		t.Fatalf("create runner pod: %v", err)
	}

	if err := client.DeleteRunnerPod(ctx, "alice", podName); err != nil {
		t.Fatalf("delete runner pod: %v", err)
	}

	ns := model.NamespaceName("alice")
	pods, err := client.Clientset.CoreV1().Pods(ns).List(ctx, metav1.ListOptions{
		LabelSelector: "app=dev-pod-runner",
	})
	if err != nil {
		t.Fatalf("list pods: %v", err)
	}
	if len(pods.Items) != 0 {
		t.Errorf("expected 0 runner pods after delete, got %d", len(pods.Items))
	}
}

func TestDeleteRunnerPod_NonExistent(t *testing.T) {
	client := newTestClient()
	ctx := context.Background()

	err := client.DeleteRunnerPod(ctx, "alice", "nonexistent-pod")
	if err != nil {
		t.Fatalf("delete nonexistent pod should not fail, got: %v", err)
	}
}

func TestRunnerPodName(t *testing.T) {
	name := model.RunnerPodName("runner-abc123")
	if name != "dev-pod-runner-abc123" {
		t.Errorf("expected dev-pod-runner-abc123, got %s", name)
	}
}