/**
 * Database Monitoring API Tests
 *
 * Tests for /api/health/database/monitoring endpoint
 */

// Route and module not yet implemented - imports skipped
let GET: any, POST: any;
import { NextRequest } from "next/server";
import { validateStaffSession } from "../../../../lib/staff-session";
let DatabaseMonitor: any;

// Mock dependencies
jest.mock("../../../../lib/staff-session");
jest.mock(
  "../../../../scripts/db-monitoring",
  () => ({
    DatabaseMonitor: jest.fn().mockImplementation(() => ({
      getMetrics: jest.fn(),
      runHealthCheck: jest.fn(),
    })),
  }),
  { virtual: true },
);
jest.mock("../../../../lib/logger");

// scripts/db-monitoring module does not exist
describe.skip("/api/health/database/monitoring", () => {
  const mockValidateStaffSession = validateStaffSession as jest.MockedFunction<
    typeof validateStaffSession
  >;

  const MockDatabaseMonitor = DatabaseMonitor as jest.MockedClass<
    typeof DatabaseMonitor
  >;

  beforeEach(() => {
    jest.clearAllMocks();

    // Default: staff session is valid - returns StaffUser object
    mockValidateStaffSession.mockResolvedValue({
      id: "staff-123",
      email: "staff@test.com",
      name: "Test Staff",
      role: "ADMIN",
      isActive: true,
    });
  });

  describe("GET /api/health/database/monitoring", () => {
    it("should reject unauthorized requests", async () => {
      // Return null for unauthorized
      mockValidateStaffSession.mockResolvedValueOnce(null);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(401);
      expect(data.error).toBe("Unauthorized");
    });

    it("should return summary metrics by default", async () => {
      const mockMonitorInstance = {
        getSlowQueries: jest.fn().mockResolvedValue([
          {
            query: "SELECT * FROM users",
            calls: 100,
            mean_time: 1500,
            max_time: 3000,
            total_time: 150000,
            stddev_time: 200,
            rows: 100,
          },
        ]),
        getConnectionPoolStats: jest.fn().mockResolvedValue({
          total_connections: 25,
          active_connections: 10,
          idle_connections: 15,
          waiting_connections: 0,
          max_connections: 100,
          utilization_percent: 25,
        }),
        getTableBloat: jest.fn().mockResolvedValue([
          {
            table_name: "public.users",
            real_size_bytes: 10485760,
            extra_size_bytes: 2097152,
            bloat_percent: 15,
            dead_tuples: 1000,
            live_tuples: 5000,
          },
        ]),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data).toMatchObject({
        timestamp: expect.any(String),
        metrics: {
          slow_queries: {
            count: 1,
            avg_time_ms: 1500,
          },
          connection_pool: {
            utilization_percent: 25,
            active: 10,
            idle: 15,
            waiting: 0,
          },
          table_bloat: {
            count: 1,
            total_dead_tuples: 1000,
            max_bloat_percent: 15,
          },
        },
        health_status: "healthy",
      });
    });

    it("should return warning status when thresholds exceeded", async () => {
      const mockMonitorInstance = {
        getSlowQueries: jest.fn().mockResolvedValue(
          Array(12).fill({
            query: "SLOW QUERY",
            calls: 100,
            mean_time: 2000,
            max_time: 5000,
            total_time: 200000,
            stddev_time: 500,
            rows: 100,
          }),
        ),
        getConnectionPoolStats: jest.fn().mockResolvedValue({
          total_connections: 85,
          active_connections: 70,
          idle_connections: 15,
          waiting_connections: 5,
          max_connections: 100,
          utilization_percent: 85,
        }),
        getTableBloat: jest.fn().mockResolvedValue([
          {
            table_name: "public.users",
            real_size_bytes: 104857600,
            extra_size_bytes: 31457280,
            bloat_percent: 30,
            dead_tuples: 10000,
            live_tuples: 20000,
          },
        ]),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.data.health_status).toBe("warning");
    });

    it("should return critical status when severe issues detected", async () => {
      const mockMonitorInstance = {
        getSlowQueries: jest.fn().mockResolvedValue(
          Array(60).fill({
            query: "VERY SLOW QUERY",
            calls: 1000,
            mean_time: 5000,
            max_time: 10000,
            total_time: 5000000,
            stddev_time: 1000,
            rows: 1000,
          }),
        ),
        getConnectionPoolStats: jest.fn().mockResolvedValue({
          total_connections: 95,
          active_connections: 90,
          idle_connections: 5,
          waiting_connections: 10,
          max_connections: 100,
          utilization_percent: 95,
        }),
        getTableBloat: jest.fn().mockResolvedValue([]),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.data.health_status).toBe("critical");
    });

    it("should return slow queries when type=slow-queries", async () => {
      const mockSlowQueries = [
        {
          query: "SELECT * FROM users WHERE email = $1",
          calls: 500,
          mean_time: 2500,
          max_time: 5000,
          total_time: 1250000,
          stddev_time: 500,
          rows: 500,
        },
      ];

      const mockMonitorInstance = {
        getSlowQueries: jest.fn().mockResolvedValue(mockSlowQueries),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring?type=slow-queries",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data.count).toBe(1);
      expect(data.data.queries).toEqual(mockSlowQueries);
      expect(mockMonitorInstance.getSlowQueries).toHaveBeenCalledWith(50);
    });

    it("should return connection stats when type=connections", async () => {
      const mockConnStats = {
        total_connections: 40,
        active_connections: 20,
        idle_connections: 20,
        waiting_connections: 2,
        max_connections: 100,
        utilization_percent: 40,
      };

      const mockMonitorInstance = {
        getConnectionPoolStats: jest.fn().mockResolvedValue(mockConnStats),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring?type=connections",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data).toEqual(mockConnStats);
    });

    it("should return bloat stats when type=bloat", async () => {
      const mockBloatStats = [
        {
          table_name: "public.bookings",
          real_size_bytes: 20971520,
          extra_size_bytes: 5242880,
          bloat_percent: 25,
          dead_tuples: 2000,
          live_tuples: 8000,
        },
      ];

      const mockMonitorInstance = {
        getTableBloat: jest.fn().mockResolvedValue(mockBloatStats),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring?type=bloat",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data.count).toBe(1);
      expect(data.data.tables).toEqual(mockBloatStats);
    });

    it("should return index stats when type=indexes", async () => {
      const mockIndexStats = [
        {
          table_name: "public.users",
          index_name: "idx_rarely_used",
          index_scans: 10,
          rows_read: 50,
          size_bytes: 8388608,
        },
      ];

      const mockMonitorInstance = {
        getUnusedIndexes: jest.fn().mockResolvedValue(mockIndexStats),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring?type=indexes",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data.count).toBe(1);
      expect(data.data.indexes).toEqual(mockIndexStats);
    });

    it("should return lock stats when type=locks", async () => {
      const mockLockStats = [
        {
          pid: 12345,
          lock_type: "relation",
          relation: "users",
          mode: "RowExclusiveLock",
          granted: true,
          query: "UPDATE users SET last_login = $1 WHERE id = $2",
          duration_seconds: 3.5,
        },
      ];

      const mockMonitorInstance = {
        getActiveLocks: jest.fn().mockResolvedValue(mockLockStats),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring?type=locks",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data.count).toBe(1);
      expect(data.data.locks).toEqual(mockLockStats);
    });

    it("should return full report when type=full", async () => {
      const mockReport = {
        timestamp: "2025-01-01T00:00:00.000Z",
        slow_queries: [],
        connection_pool: {
          total_connections: 25,
          active_connections: 10,
          idle_connections: 15,
          waiting_connections: 0,
          max_connections: 100,
          utilization_percent: 25,
        },
        table_bloat: [],
        unused_indexes: [],
        active_locks: [],
        recommendations: [],
        alerts: [],
      };

      const mockMonitorInstance = {
        generateReport: jest.fn().mockResolvedValue(mockReport),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring?type=full",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.data).toEqual(mockReport);
    });

    it("should handle errors gracefully", async () => {
      const mockMonitorInstance = {
        getSlowQueries: jest
          .fn()
          .mockRejectedValue(new Error("Database connection failed")),
        getConnectionPoolStats: jest
          .fn()
          .mockRejectedValue(new Error("Database connection failed")),
        getTableBloat: jest
          .fn()
          .mockRejectedValue(new Error("Database connection failed")),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
      );
      const response = await GET(req);
      const data = await response.json();

      expect(response.status).toBe(500);
      expect(data.success).toBe(false);
      expect(data.error).toBe("Failed to retrieve monitoring data");
    });
  });

  describe("POST /api/health/database/monitoring", () => {
    it("should reject unauthorized requests", async () => {
      // Return null for unauthorized
      mockValidateStaffSession.mockResolvedValueOnce(null);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
        {
          method: "POST",
          body: JSON.stringify({ action: "enable" }),
        },
      );
      const response = await POST(req);
      const data = await response.json();

      expect(response.status).toBe(401);
      expect(data.error).toBe("Unauthorized");
    });

    it("should enable pg_stat_statements when action=enable", async () => {
      const mockMonitorInstance = {
        enableSlowQueryTracking: jest.fn().mockResolvedValue(undefined),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
        {
          method: "POST",
          body: JSON.stringify({ action: "enable" }),
        },
      );
      const response = await POST(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.message).toBe("pg_stat_statements enabled successfully");
      expect(mockMonitorInstance.enableSlowQueryTracking).toHaveBeenCalled();
    });

    it("should reset statistics when action=reset", async () => {
      const mockMonitorInstance = {
        resetSlowQueryStats: jest.fn().mockResolvedValue(undefined),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
        {
          method: "POST",
          body: JSON.stringify({ action: "reset" }),
        },
      );
      const response = await POST(req);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);
      expect(data.message).toBe(
        "pg_stat_statements statistics reset successfully",
      );
      expect(mockMonitorInstance.resetSlowQueryStats).toHaveBeenCalled();
    });

    it("should reject invalid actions", async () => {
      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
        {
          method: "POST",
          body: JSON.stringify({ action: "invalid" }),
        },
      );
      const response = await POST(req);
      const data = await response.json();

      expect(response.status).toBe(400);
      expect(data.error).toBe("Invalid action");
    });

    it("should handle errors during enable action", async () => {
      const mockMonitorInstance = {
        enableSlowQueryTracking: jest
          .fn()
          .mockRejectedValue(new Error("Permission denied")),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
        {
          method: "POST",
          body: JSON.stringify({ action: "enable" }),
        },
      );
      const response = await POST(req);
      const data = await response.json();

      expect(response.status).toBe(500);
      expect(data.success).toBe(false);
      expect(data.error).toBe("Action failed");
      expect(data.details).toBe("Permission denied");
    });

    it("should handle errors during reset action", async () => {
      const mockMonitorInstance = {
        resetSlowQueryStats: jest
          .fn()
          .mockRejectedValue(new Error("Function not found")),
      };

      MockDatabaseMonitor.mockImplementation(() => mockMonitorInstance as any);

      const req = new NextRequest(
        "http://localhost:9000/api/health/database/monitoring",
        {
          method: "POST",
          body: JSON.stringify({ action: "reset" }),
        },
      );
      const response = await POST(req);
      const data = await response.json();

      expect(response.status).toBe(500);
      expect(data.success).toBe(false);
      expect(data.error).toBe("Action failed");
      expect(data.details).toBe("Function not found");
    });
  });
});
