package service

import (
	"context"
	"strings"
	"sync"
	"testing"
	"time"

	"oci-portal/internal/oci"
)

type reservedIPStubClient struct {
	*fakeClient

	mu        sync.Mutex
	ips       []oci.ReservedIP
	assigned  map[string]string // publicIpId -> instanceId
	vnicBound map[string]string // publicIpId -> vnicId
	deleted   []string
	instState string // GetInstance 返回的状态
	launched  oci.CreateInstanceInput
}

func (f *reservedIPStubClient) ListReservedIPs(ctx context.Context, cred oci.Credentials, region, compartmentID string) ([]oci.ReservedIP, error) {
	return f.ips, nil
}

func (f *reservedIPStubClient) CreateReservedIP(ctx context.Context, cred oci.Credentials, region, compartmentID, displayName string) (oci.ReservedIP, error) {
	ip := oci.ReservedIP{ID: "ocid1.publicip..new", DisplayName: displayName, IPAddress: "155.248.0.10", LifecycleState: "AVAILABLE"}
	f.ips = append(f.ips, ip)
	return ip, nil
}

func (f *reservedIPStubClient) AssignReservedIP(ctx context.Context, cred oci.Credentials, region, publicIPID, instanceID string) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	if f.assigned == nil {
		f.assigned = map[string]string{}
	}
	f.assigned[publicIPID] = instanceID
	return nil
}

func (f *reservedIPStubClient) AssignReservedIPToVnic(ctx context.Context, cred oci.Credentials, region, publicIPID, vnicID string) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	if f.vnicBound == nil {
		f.vnicBound = map[string]string{}
	}
	f.vnicBound[publicIPID] = vnicID
	return nil
}

func (f *reservedIPStubClient) DeleteReservedIP(ctx context.Context, cred oci.Credentials, region, publicIPID string) error {
	f.deleted = append(f.deleted, publicIPID)
	return nil
}

func (f *reservedIPStubClient) LaunchInstance(ctx context.Context, cred oci.Credentials, in oci.CreateInstanceInput) (oci.Instance, error) {
	f.launched = in
	return oci.Instance{ID: "ocid1.instance..new", LifecycleState: "PROVISIONING"}, nil
}

func (f *reservedIPStubClient) GetInstance(ctx context.Context, cred oci.Credentials, region, instanceID string) (oci.Instance, error) {
	return oci.Instance{ID: instanceID, LifecycleState: f.instState}, nil
}

func (f *reservedIPStubClient) assignedTo(publicIPID string) string {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.assigned[publicIPID]
}

func TestReservedIPCrud(t *testing.T) {
	client := &reservedIPStubClient{fakeClient: &fakeClient{tenancy: oci.TenancyInfo{Name: "t"}}}
	svc := newTestService(t, client)
	cfg := importAliveConfig(t, svc)
	ctx := context.Background()

	if _, err := svc.CreateReservedIP(ctx, cfg.ID, "ap-tokyo-1", "", "ip-1"); err != nil {
		t.Fatalf("CreateReservedIP: %v", err)
	}
	got, err := svc.ReservedIPs(ctx, cfg.ID, "ap-tokyo-1", "")
	if err != nil || len(got) != 1 || got[0].DisplayName != "ip-1" {
		t.Fatalf("ReservedIPs = %+v, %v", got, err)
	}
	// publicIpId 缺失被拒
	if err := svc.AssignReservedIP(ctx, cfg.ID, "ap-tokyo-1", "", "inst", ""); err == nil ||
		!strings.Contains(err.Error(), "publicIpId") {
		t.Errorf("AssignReservedIP 空 id err = %v, want publicIpId required", err)
	}
	if err := svc.AssignReservedIP(ctx, cfg.ID, "ap-tokyo-1", "ocid1.publicip..new", "ocid1.instance..a", ""); err != nil {
		t.Fatalf("AssignReservedIP: %v", err)
	}
	if got := client.assignedTo("ocid1.publicip..new"); got != "ocid1.instance..a" {
		t.Errorf("assigned = %q, want instance a", got)
	}
	// vnicId 非空时路由到按网卡绑定
	if err := svc.AssignReservedIP(ctx, cfg.ID, "ap-tokyo-1", "ocid1.publicip..new", "", "ocid1.vnic..v1"); err != nil {
		t.Fatalf("AssignReservedIP vnic: %v", err)
	}
	if got := client.vnicBound["ocid1.publicip..new"]; got != "ocid1.vnic..v1" {
		t.Errorf("vnicBound = %q, want vnic v1", got)
	}
	if err := svc.DeleteReservedIP(ctx, cfg.ID, "ap-tokyo-1", "ocid1.publicip..new"); err != nil {
		t.Fatalf("DeleteReservedIP: %v", err)
	}
	if len(client.deleted) != 1 {
		t.Errorf("deleted = %v, want 1 entry", client.deleted)
	}
}

func TestCreateInstanceWithReservedIP(t *testing.T) {
	client := &reservedIPStubClient{
		fakeClient: &fakeClient{tenancy: oci.TenancyInfo{Name: "t"}},
		instState:  "RUNNING",
	}
	svc := newTestService(t, client)
	cfg := importAliveConfig(t, svc)
	ctx := context.Background()
	in := oci.CreateInstanceInput{
		AvailabilityDomain: "AD-1",
		DisplayName:        "vm1",
		Shape:              "VM.Standard.A1.Flex",
		ImageID:            "ocid1.image..a",
		SubnetID:           "ocid1.subnet..s",
		ReservedPublicIPID: "ocid1.publicip..r",
	}

	// 批量创建 + 保留 IP 被拒
	if _, _, err := svc.CreateInstances(ctx, cfg.ID, in, 2); err == nil ||
		!strings.Contains(err.Error(), "single instance") {
		t.Fatalf("批量+保留IP err = %v, want single instance", err)
	}

	instances, failures, err := svc.CreateInstances(ctx, cfg.ID, in, 1)
	if err != nil || len(failures) != 0 || len(instances) != 1 {
		t.Fatalf("CreateInstances = %+v, %v, %v", instances, failures, err)
	}
	// 后台 goroutine 轮询到 RUNNING 后完成绑定
	deadline := time.Now().Add(3 * time.Second)
	for time.Now().Before(deadline) {
		if client.assignedTo("ocid1.publicip..r") == "ocid1.instance..new" {
			return
		}
		time.Sleep(20 * time.Millisecond)
	}
	t.Fatalf("assigned = %q, want bind to new instance", client.assignedTo("ocid1.publicip..r"))
}