import { describe, it, expect } from "vitest";
import { z } from "zod";

describe("Store Passkey Crypto Keys API", () => {
  const mockTenantId = "123e4567-e89b-12d3-a456-426614174000";
  const mockUserId = "456e7890-e89b-12d3-a456-426614174001";
  const mockPasskeyId = "passkey_abc123def456";
  const mockEmail = "staff@example.com";

  describe("POST /api/auth/passkeys/[passkeyId]/crypto", () => {
    it("should validate request body with Zod schema", () => {
      const requestSchema = z.object({
        tenantId: z.string().uuid("Valid tenant ID is required"),
        publicKey: z.string().min(1, "Public key is required"),
        privateKeyShare: z.string().min(1, "Private key share is required"),
        prfOutput: z.string().min(1, "PRF output is required for zero-knowledge verification"),
      });

      const validRequest = {
        tenantId: mockTenantId,
        publicKey: "SGVsbG8gV29ybGQ=", // Mock base64
        privateKeyShare: "VGVzdCBEYXRh", // Mock base64
        prfOutput: "UHJvb2ZPZk93bmVyc2hpcA==", // Mock base64
      };

      const result = requestSchema.safeParse(validRequest);
      expect(result.success).toBe(true);
    });

    it("should reject request without tenantId", () => {
      const requestSchema = z.object({
        tenantId: z.string().uuid("Valid tenant ID is required"),
        publicKey: z.string().min(1, "Public key is required"),
        privateKeyShare: z.string().min(1, "Private key share is required"),
        prfOutput: z.string().min(1, "PRF output is required for zero-knowledge verification"),
      });

      const invalidRequest = {
        publicKey: "SGVsbG8gV29ybGQ=",
        privateKeyShare: "VGVzdCBEYXRh",
        prfOutput: "UHJvb2ZPZk93bmVyc2hpcA==",
      };

      const result = requestSchema.safeParse(invalidRequest);
      expect(result.success).toBe(false);
      if (!result.success) {
        expect(result.error.issues[0].message).toContain("string");
      }
    });

    it("should reject request with invalid UUID tenantId", () => {
      const requestSchema = z.object({
        tenantId: z.string().uuid("Valid tenant ID is required"),
        publicKey: z.string().min(1, "Public key is required"),
        privateKeyShare: z.string().min(1, "Private key share is required"),
        prfOutput: z.string().min(1, "PRF output is required for zero-knowledge verification"),
      });

      const invalidRequest = {
        tenantId: "not-a-uuid",
        publicKey: "SGVsbG8gV29ybGQ=",
        privateKeyShare: "VGVzdCBEYXRh",
        prfOutput: "UHJvb2ZPZk93bmVyc2hpcA==",
      };

      const result = requestSchema.safeParse(invalidRequest);
      expect(result.success).toBe(false);
      if (!result.success) {
        expect(result.error.issues[0].message).toContain("tenant ID is required");
      }
    });

    it("should reject request without publicKey", () => {
      const requestSchema = z.object({
        tenantId: z.string().uuid("Valid tenant ID is required"),
        publicKey: z.string().min(1, "Public key is required"),
        privateKeyShare: z.string().min(1, "Private key share is required"),
        prfOutput: z.string().min(1, "PRF output is required for zero-knowledge verification"),
      });

      const invalidRequest = {
        tenantId: mockTenantId,
        privateKeyShare: "VGVzdCBEYXRh",
        prfOutput: "UHJvb2ZPZk93bmVyc2hpcA==",
      };

      const result = requestSchema.safeParse(invalidRequest);
      expect(result.success).toBe(false);
    });

    it("should reject request without privateKeyShare", () => {
      const requestSchema = z.object({
        tenantId: z.string().uuid("Valid tenant ID is required"),
        publicKey: z.string().min(1, "Public key is required"),
        privateKeyShare: z.string().min(1, "Private key share is required"),
        prfOutput: z.string().min(1, "PRF output is required for zero-knowledge verification"),
      });

      const invalidRequest = {
        tenantId: mockTenantId,
        publicKey: "SGVsbG8gV29ybGQ=",
        prfOutput: "UHJvb2ZPZk93bmVyc2hpcA==",
      };

      const result = requestSchema.safeParse(invalidRequest);
      expect(result.success).toBe(false);
    });

    it("should reject request without PRF output", () => {
      const requestSchema = z.object({
        tenantId: z.string().uuid("Valid tenant ID is required"),
        publicKey: z.string().min(1, "Public key is required"),
        privateKeyShare: z.string().min(1, "Private key share is required"),
        prfOutput: z.string().min(1, "PRF output is required for zero-knowledge verification"),
      });

      const invalidRequest = {
        tenantId: mockTenantId,
        publicKey: "SGVsbG8gV29ybGQ=",
        privateKeyShare: "VGVzdCBEYXRh",
      };

      const result = requestSchema.safeParse(invalidRequest);
      expect(result.success).toBe(false);
      if (!result.success) {
        expect(result.error.issues[0].message).toContain("string");
      }
    });

    it("should verify passkey ownership validation", () => {
      // Simulate user passkeys
      const userPasskeys = [
        { id: "passkey_1", userId: mockUserId },
        { id: "passkey_2", userId: mockUserId },
        { id: mockPasskeyId, userId: mockUserId },
      ];

      // Test finding owned passkey
      const ownedPasskey = userPasskeys.find((p) => p.id === mockPasskeyId);
      expect(ownedPasskey).toBeDefined();
      expect(ownedPasskey?.userId).toBe(mockUserId);

      // Test rejecting unowned passkey
      const unownedPasskeyId = "passkey_not_owned";
      const unownedPasskey = userPasskeys.find((p) => p.id === unownedPasskeyId);
      expect(unownedPasskey).toBeUndefined();
    });

    it("should validate tenant access using checkPermission logic", () => {
      // Mock user with tenant access
      const user = {
        id: mockUserId,
        role: "STAFF" as const,
        tenantId: mockTenantId,
      };

      // Should allow access if tenantId matches
      const hasAccess = user.tenantId === mockTenantId;
      expect(hasAccess).toBe(true);

      // Should deny access if tenantId doesn't match
      const differentTenantId = "999e4567-e89b-12d3-a456-426614174999";
      const hasNoAccess = user.tenantId === differentTenantId;
      expect(hasNoAccess).toBe(false);
    });

    it("should allow GLOBAL_ADMIN to access any tenant", () => {
      const globalAdmin = {
        id: mockUserId,
        role: "GLOBAL_ADMIN" as const,
        tenantId: null,
      };

      // Global admin should have access regardless of tenant
      const canAccessAnyTenant = globalAdmin.role === "GLOBAL_ADMIN";
      expect(canAccessAnyTenant).toBe(true);
    });

    it("should detect duplicate crypto keys for same passkey", () => {
      // Simulate existing crypto entry
      const existingCrypto = {
        userId: mockUserId,
        passkeyId: mockPasskeyId,
        publicKey: "existing_key",
        privateKeyShare: "existing_share",
      };

      // Should detect conflict
      const isDuplicate = existingCrypto.passkeyId === mockPasskeyId;
      expect(isDuplicate).toBe(true);
    });

    it("should validate PRF output format", () => {
      // PRF output should be base64 encoded
      const mockPrfOutput = "UHJvb2ZPZk93bmVyc2hpcA==";
      const base64Pattern = /^[A-Za-z0-9+/]*={0,2}$/;

      expect(mockPrfOutput).toMatch(base64Pattern);

      // Should decode to Buffer without errors
      const decoded = Buffer.from(mockPrfOutput, "base64");
      expect(decoded).toBeInstanceOf(Buffer);
      expect(decoded.length).toBeGreaterThan(0);
    });

    it("should validate PRF output is exactly 32 bytes", () => {
      // Create a valid 32-byte PRF output
      const validPrfOutput = Buffer.alloc(32, 0xaa);
      const validPrfOutputBase64 = validPrfOutput.toString("base64");

      const decoded = Buffer.from(validPrfOutputBase64, "base64");
      expect(decoded.length).toBe(32);

      // Test invalid lengths
      const invalidPrfOutput = Buffer.alloc(16, 0xaa); // Too short
      const invalidPrfOutputBase64 = invalidPrfOutput.toString("base64");
      const decodedInvalid = Buffer.from(invalidPrfOutputBase64, "base64");
      expect(decodedInvalid.length).not.toBe(32);
    });

    it("should reject PRF output with all zeros", () => {
      // All-zero PRF output is invalid
      const allZerosPrfOutput = Buffer.alloc(32, 0);
      const isAllZeros = allZerosPrfOutput.every((byte) => byte === 0);
      expect(isAllZeros).toBe(true);

      // Valid PRF output should not be all zeros
      const validPrfOutput = Buffer.alloc(32, 0xaa);
      const isNotAllZeros = !validPrfOutput.every((byte) => byte === 0);
      expect(isNotAllZeros).toBe(true);
    });

    it("should validate PRF output is derived from email salt", () => {
      // PRF salt format: "open-reception-prf:{email}"
      const expectedSalt = `open-reception-prf:${mockEmail}`;
      const encoder = new TextEncoder();
      const saltBytes = encoder.encode(expectedSalt);

      expect(saltBytes).toBeInstanceOf(Uint8Array);
      expect(saltBytes.length).toBeGreaterThan(0);
      expect(saltBytes.length).toBe(expectedSalt.length);
    });

    it("should validate successful response structure", () => {
      const mockSuccessResponse = {
        success: true,
        message: "Crypto keys stored successfully",
        passkeyId: mockPasskeyId,
      };

      expect(mockSuccessResponse.success).toBe(true);
      expect(mockSuccessResponse.message).toBeTruthy();
      expect(mockSuccessResponse.passkeyId).toBe(mockPasskeyId);
    });

    it("should validate error responses for different scenarios", () => {
      const errorScenarios = [
        {
          status: 400,
          error: "Invalid request data",
          description: "Validation error",
        },
        {
          status: 403,
          error: "Not authorized",
          description: "Permission denied",
        },
        {
          status: 404,
          error: "Passkey not found",
          description: "Passkey doesn't exist",
        },
        {
          status: 409,
          error: "Crypto keys already exist",
          description: "Duplicate keys",
        },
      ];

      errorScenarios.forEach((scenario) => {
        expect(scenario.status).toBeGreaterThanOrEqual(400);
        expect(scenario.status).toBeLessThan(600);
        expect(scenario.error).toBeTruthy();
      });
    });

    it("should validate ML-KEM-768 key specifications", () => {
      // ML-KEM-768 (formerly Kyber-768) key sizes
      const mlKem768PublicKeySize = 1184; // bytes
      const mlKem768PrivateKeySize = 2400; // bytes

      // Base64 encoding increases size by ~33% (4/3)
      const expectedPublicKeyBase64Size = Math.ceil((mlKem768PublicKeySize * 4) / 3);
      const expectedPrivateKeyBase64Size = Math.ceil((mlKem768PrivateKeySize * 4) / 3);

      expect(expectedPublicKeyBase64Size).toBeGreaterThan(1500);
      expect(expectedPrivateKeyBase64Size).toBeGreaterThan(3100);
    });

    it("should validate authentication requirement", () => {
      // No authenticated user
      const user = null;

      // Should require authentication
      const isAuthenticated = user !== null;
      expect(isAuthenticated).toBe(false);
    });

    it("should validate cascading deletion on passkey removal", () => {
      // Mock crypto entries
      const cryptoEntries = [
        { passkeyId: "passkey_1", userId: mockUserId },
        { passkeyId: mockPasskeyId, userId: mockUserId },
        { passkeyId: "passkey_3", userId: mockUserId },
      ];

      // Simulate deletion
      const remainingEntries = cryptoEntries.filter((entry) => entry.passkeyId !== mockPasskeyId);

      expect(cryptoEntries.length).toBe(3);
      expect(remainingEntries.length).toBe(2);
      expect(remainingEntries.some((e) => e.passkeyId === mockPasskeyId)).toBe(false);
    });

    it("should validate zero-knowledge architecture principles", () => {
      // Server should never see complete private key
      const passkeyBasedShard = new Uint8Array([1, 2, 3, 4]); // PRF-derived (client-only)
      const databaseShard = new Uint8Array([5, 6, 7, 8]); // Stored on server
      const privateKey = new Uint8Array(4); // Complete key (client-only)

      // XOR reconstruction happens only on client
      for (let i = 0; i < privateKey.length; i++) {
        privateKey[i] = passkeyBasedShard[i] ^ databaseShard[i];
      }

      // Verify XOR properties
      expect(privateKey[0]).toBe(1 ^ 5);
      expect(privateKey[1]).toBe(2 ^ 6);

      // Server never has passkeyBasedShard
      const serverHasCompleteKey = false;
      expect(serverHasCompleteKey).toBe(false);
    });
  });
});
