package vm

import (
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"proxui/backend/internal/auth"
)

func TestListProjectVMsReturnsVisibleVMs(t *testing.T) {
	repository := &stubRepository{
		listFound: true,
		vms: []VM{{
			ID:             "vm-1",
			ProjectID:      "project-1",
			TenantID:       "tenant-1",
			Name:           "web-1",
			Status:         "running",
			MembershipRole: "viewer",
			CreatedAt:      time.Date(2026, 6, 11, 12, 0, 0, 0, time.UTC),
			UpdatedAt:      time.Date(2026, 6, 11, 12, 0, 0, 0, time.UTC),
		}},
	}
	handler := NewHandler(repository)
	req := requestWithPrincipal(http.MethodGet, "/projects/project-1/vms")
	req.SetPathValue("projectID", "project-1")
	rec := httptest.NewRecorder()

	handler.ListProjectVMs(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}
	if repository.profileID != "profile-1" {
		t.Fatalf("profileID = %q, want profile-1", repository.profileID)
	}
	if repository.projectID != "project-1" {
		t.Fatalf("projectID = %q, want project-1", repository.projectID)
	}

	var response struct {
		Data []VM `json:"data"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &response); err != nil {
		t.Fatalf("unmarshal response: %v", err)
	}
	if len(response.Data) != 1 {
		t.Fatalf("len(data) = %d, want 1", len(response.Data))
	}
	if response.Data[0].ID != "vm-1" {
		t.Fatalf("VM ID = %q, want vm-1", response.Data[0].ID)
	}
}

func TestListProjectVMsReturnsNotFoundForInaccessibleProject(t *testing.T) {
	handler := NewHandler(&stubRepository{listFound: false})
	req := requestWithPrincipal(http.MethodGet, "/projects/project-1/vms")
	req.SetPathValue("projectID", "project-1")
	rec := httptest.NewRecorder()

	handler.ListProjectVMs(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNotFound)
	}
}

func TestGetVMReturnsVisibleVM(t *testing.T) {
	repository := &stubRepository{
		getFound: true,
		vm: VM{
			ID:       "vm-1",
			TenantID: "tenant-1",
			Name:     "web-1",
			Status:   "running",
		},
	}
	handler := NewHandler(repository)
	req := requestWithPrincipal(http.MethodGet, "/vms/vm-1")
	req.SetPathValue("vmID", "vm-1")
	rec := httptest.NewRecorder()

	handler.GetVM(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}
	if repository.vmID != "vm-1" {
		t.Fatalf("vmID = %q, want vm-1", repository.vmID)
	}
}

func TestGetVMReturnsNotFoundForInvisibleVM(t *testing.T) {
	handler := NewHandler(&stubRepository{getFound: false})
	req := requestWithPrincipal(http.MethodGet, "/vms/vm-1")
	req.SetPathValue("vmID", "vm-1")
	rec := httptest.NewRecorder()

	handler.GetVM(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNotFound)
	}
}

func TestGetVMReturnsServerError(t *testing.T) {
	handler := NewHandler(&stubRepository{err: errors.New("db failed")})
	req := requestWithPrincipal(http.MethodGet, "/vms/vm-1")
	req.SetPathValue("vmID", "vm-1")
	rec := httptest.NewRecorder()

	handler.GetVM(rec, req)

	if rec.Code != http.StatusInternalServerError {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusInternalServerError)
	}
}

func requestWithPrincipal(method string, target string) *http.Request {
	req := httptest.NewRequest(method, target, nil)
	return req.WithContext(auth.ContextWithPrincipal(req.Context(), auth.Principal{
		Subject: "profile-1",
		Email:   "user@example.test",
		Role:    "authenticated",
	}))
}

type stubRepository struct {
	profileID string
	projectID string
	vmID      string
	vms       []VM
	vm        VM
	listFound bool
	getFound  bool
	err       error
}

func (s *stubRepository) ListProjectVMs(_ context.Context, profileID string, projectID string) ([]VM, bool, error) {
	s.profileID = profileID
	s.projectID = projectID
	return s.vms, s.listFound, s.err
}

func (s *stubRepository) GetVM(_ context.Context, profileID string, vmID string) (VM, bool, error) {
	s.profileID = profileID
	s.vmID = vmID
	return s.vm, s.getFound, s.err
}

func (s *stubRepository) GetProjectInfo(_ context.Context, profileID string, projectID string) (ProjectInfo, bool, error) {
	return ProjectInfo{}, false, nil
}

func (s *stubRepository) CheckQuota(_ context.Context, _ string) (QuotaInfo, error) {
	return QuotaInfo{}, nil
}

func (s *stubRepository) ReserveNextVMID(_ context.Context, _ string) (int, error) {
	return 0, nil
}

func (s *stubRepository) InsertVM(_ context.Context, _ InsertVMRecord) (VM, error) {
	return VM{}, nil
}