/**
 * Account Encryption Middleware Tests
 *
 * Tests transparent encryption/decryption of OAuth tokens in Account model
 * using Prisma middleware.
 */

import { describe, it, expect, beforeAll, afterAll, vi } from "vitest";
import { Test, TestingModule } from "@nestjs/testing";
import { PrismaClient } from "@prisma/client";
import { CryptoService } from "../federation/crypto.service";
import { ConfigService } from "@nestjs/config";
import { registerAccountEncryptionMiddleware } from "./account-encryption.middleware";

describe("AccountEncryptionMiddleware", () => {
  let mockPrisma: any;
  let cryptoService: CryptoService;
  let mockConfigService: Partial<ConfigService>;
  let middlewareFunction: any;

  beforeAll(() => {
    // Mock ConfigService with a valid test encryption key
    mockConfigService = {
      get: vi.fn((key: string) => {
        if (key === "ENCRYPTION_KEY") {
          // Valid 64-character hex string (32 bytes)
          return "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef";
        }
        return null;
      }),
    };

    cryptoService = new CryptoService(mockConfigService as ConfigService);

    // Create a mock Prisma client
    mockPrisma = {
      $use: vi.fn((fn) => {
        middlewareFunction = fn;
      }),
    };

    // Register the middleware
    registerAccountEncryptionMiddleware(mockPrisma, cryptoService);
  });

  afterAll(async () => {
    // No cleanup needed for mocks
  });

  describe("Encryption on Create", () => {
    it("should encrypt accessToken on account creation", async () => {
      const plainAccessToken = "test-access-token-12345";
      const mockParams = {
        model: "Account",
        action: "create" as const,
        args: {
          data: {
            userId: "test-user-id",
            accountId: "test-account-id",
            providerId: "github",
            accessToken: plainAccessToken,
          },
        },
      };

      // Middleware should modify args
      const result = await callMiddleware(mockPrisma, mockParams);

      // Verify accessToken is encrypted (starts with hex:hex:hex format)
      expect(result.args.data.accessToken).toBeDefined();
      expect(result.args.data.accessToken).not.toBe(plainAccessToken);
      expect(result.args.data.accessToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });

    it("should encrypt refreshToken on account creation", async () => {
      const plainRefreshToken = "test-refresh-token-67890";
      const mockParams = {
        model: "Account",
        action: "create" as const,
        args: {
          data: {
            userId: "test-user-id",
            accountId: "test-account-id",
            providerId: "github",
            refreshToken: plainRefreshToken,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.refreshToken).toBeDefined();
      expect(result.args.data.refreshToken).not.toBe(plainRefreshToken);
      expect(result.args.data.refreshToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });

    it("should encrypt idToken on account creation", async () => {
      const plainIdToken = "test-id-token-abcdef";
      const mockParams = {
        model: "Account",
        action: "create" as const,
        args: {
          data: {
            userId: "test-user-id",
            accountId: "test-account-id",
            providerId: "oauth",
            idToken: plainIdToken,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.idToken).toBeDefined();
      expect(result.args.data.idToken).not.toBe(plainIdToken);
      expect(result.args.data.idToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });

    it("should encrypt all three tokens when present", async () => {
      const mockParams = {
        model: "Account",
        action: "create" as const,
        args: {
          data: {
            userId: "test-user-id",
            accountId: "test-account-id",
            providerId: "oauth",
            accessToken: "access-123",
            refreshToken: "refresh-456",
            idToken: "id-789",
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.accessToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
      expect(result.args.data.refreshToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
      expect(result.args.data.idToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });

    it("should handle null tokens gracefully", async () => {
      const mockParams = {
        model: "Account",
        action: "create" as const,
        args: {
          data: {
            userId: "test-user-id",
            accountId: "test-account-id",
            providerId: "github",
            accessToken: null,
            refreshToken: null,
            idToken: null,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.accessToken).toBeNull();
      expect(result.args.data.refreshToken).toBeNull();
      expect(result.args.data.idToken).toBeNull();
    });

    it("should handle undefined tokens gracefully", async () => {
      const mockParams = {
        model: "Account",
        action: "create" as const,
        args: {
          data: {
            userId: "test-user-id",
            accountId: "test-account-id",
            providerId: "github",
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.accessToken).toBeUndefined();
      expect(result.args.data.refreshToken).toBeUndefined();
      expect(result.args.data.idToken).toBeUndefined();
    });
  });

  describe("Encryption on Update", () => {
    it("should encrypt accessToken on account update", async () => {
      const plainAccessToken = "updated-access-token";
      const mockParams = {
        model: "Account",
        action: "update" as const,
        args: {
          where: { id: "account-id" },
          data: {
            accessToken: plainAccessToken,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.accessToken).toBeDefined();
      expect(result.args.data.accessToken).not.toBe(plainAccessToken);
      expect(result.args.data.accessToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });

    it("should handle updateMany action", async () => {
      const mockParams = {
        model: "Account",
        action: "updateMany" as const,
        args: {
          where: { providerId: "github" },
          data: {
            accessToken: "new-token",
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      expect(result.args.data.accessToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });

    it("should not encrypt already encrypted tokens (idempotent)", async () => {
      // Simulate a token that's already encrypted
      const encryptedToken = cryptoService.encrypt("original-token");
      const mockParams = {
        model: "Account",
        action: "update" as const,
        args: {
          where: { id: "account-id" },
          data: {
            accessToken: encryptedToken,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      // Should remain unchanged if already encrypted
      expect(result.args.data.accessToken).toBe(encryptedToken);
    });

    it("should handle upsert action (encrypt both create and update)", async () => {
      const plainCreateToken = "create-token";
      const plainUpdateToken = "update-token";

      const mockParams = {
        model: "Account",
        action: "upsert" as const,
        args: {
          where: { id: "account-id" },
          create: {
            userId: "user-id",
            accountId: "account-id",
            providerId: "github",
            accessToken: plainCreateToken,
          },
          update: {
            accessToken: plainUpdateToken,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      // Both create and update data should be encrypted
      expect(result.args.create.accessToken).toBeDefined();
      expect(result.args.create.accessToken).not.toBe(plainCreateToken);
      expect(result.args.create.accessToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);

      expect(result.args.update.accessToken).toBeDefined();
      expect(result.args.update.accessToken).not.toBe(plainUpdateToken);
      expect(result.args.update.accessToken).toMatch(/^[0-9a-f]+:[0-9a-f]+:[0-9a-f]+$/);
    });
  });

  describe("Decryption on Read", () => {
    it("should decrypt accessToken on findUnique", async () => {
      const plainToken = "my-access-token";
      const encryptedToken = cryptoService.encrypt(plainToken);

      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      // Mock database returning encrypted data with encryptionVersion
      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "github",
        accessToken: encryptedToken,
        refreshToken: null,
        idToken: null,
        encryptionVersion: "aes",
      }));

      // Call middleware - it should decrypt the result
      const result = (await middlewareFunction(mockParams, mockNext)) as any;

      expect(mockNext).toHaveBeenCalledWith(mockParams);
      expect(result.accessToken).toBe(plainToken); // Decrypted by middleware
      expect(result.encryptionVersion).toBe("aes");
    });

    it("should decrypt all tokens on findMany", async () => {
      const plainAccess = "access-token";
      const plainRefresh = "refresh-token";
      const plainId = "id-token";

      const mockParams = {
        model: "Account",
        action: "findMany" as const,
        args: {
          where: { providerId: "github" },
        },
      };

      // Mock database returning multiple encrypted records
      const mockNext = vi.fn(async () => [
        {
          id: "account-1",
          userId: "user-id",
          accountId: "account-1",
          providerId: "github",
          accessToken: cryptoService.encrypt(plainAccess),
          refreshToken: cryptoService.encrypt(plainRefresh),
          idToken: cryptoService.encrypt(plainId),
          encryptionVersion: "aes",
        },
      ]);

      const result = (await middlewareFunction(mockParams, mockNext)) as any[];

      expect(mockNext).toHaveBeenCalledWith(mockParams);
      expect(result[0].accessToken).toBe(plainAccess);
      expect(result[0].refreshToken).toBe(plainRefresh);
      expect(result[0].idToken).toBe(plainId);
    });

    it("should handle null tokens on read", async () => {
      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "github",
        accessToken: null,
        refreshToken: null,
        idToken: null,
        encryptionVersion: null,
      }));

      const result = (await middlewareFunction(mockParams, mockNext)) as any;

      expect(result.accessToken).toBeNull();
      expect(result.refreshToken).toBeNull();
      expect(result.idToken).toBeNull();
    });

    it("should handle legacy plaintext tokens (backward compatibility)", async () => {
      // Simulate old data without encryptionVersion field
      const plaintextToken = "legacy-plaintext-token";

      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "github",
        accessToken: plaintextToken,
        refreshToken: null,
        idToken: null,
        encryptionVersion: null, // No encryption version = plaintext
      }));

      const result = (await middlewareFunction(mockParams, mockNext)) as any;

      // Should pass through unchanged (no encryptionVersion)
      expect(result.accessToken).toBe(plaintextToken);
    });

    it("should throw error on vault ciphertext when OpenBao unavailable", async () => {
      // Simulate vault Transit encryption format when OpenBao is unavailable
      const vaultCiphertext = "vault:v1:base64encodeddata";

      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "oauth",
        accessToken: vaultCiphertext,
        refreshToken: null,
        idToken: null,
        encryptionVersion: "vault", // vault encryption
      }));

      // Should throw error because VaultService can't decrypt vault:v1: without OpenBao
      await expect(middlewareFunction(mockParams, mockNext)).rejects.toThrow(
        "Failed to decrypt account credentials"
      );
    });

    it("should use encryptionVersion as primary discriminator", async () => {
      // Even if token looks like AES format, should not decrypt if encryptionVersion != 'aes'
      const fakeEncryptedToken = "abc123:def456:789ghi"; // Looks like AES format

      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "github",
        accessToken: fakeEncryptedToken,
        refreshToken: null,
        idToken: null,
        encryptionVersion: null, // No encryption version
      }));

      const result = (await middlewareFunction(mockParams, mockNext)) as any;

      // Should NOT attempt to decrypt (encryptionVersion is null)
      expect(result.accessToken).toBe(fakeEncryptedToken);
    });

    it("should throw error on corrupted encrypted data", async () => {
      // Test with malformed/corrupted encrypted token
      const corruptedToken = "deadbeef:cafebabe:corrupted_data_xyz"; // Valid format but wrong data

      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "github",
        accessToken: corruptedToken,
        refreshToken: null,
        idToken: null,
        encryptionVersion: "aes", // Marked as encrypted
      }));

      // Should throw error - decryption failures are now propagated to prevent silent corruption
      await expect(middlewareFunction(mockParams, mockNext)).rejects.toThrow(
        "Failed to decrypt account credentials"
      );
    });

    it("should throw error on completely malformed encrypted format", async () => {
      // Test with data that doesn't match expected format at all
      const malformedToken = "this:is:not:valid:encrypted:data:too:many:parts";

      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
        },
      };

      const mockNext = vi.fn(async () => ({
        id: "account-id",
        userId: "user-id",
        accountId: "account-id",
        providerId: "github",
        accessToken: malformedToken,
        refreshToken: null,
        idToken: null,
        encryptionVersion: "aes",
      }));

      // Should throw error - malformed data cannot be decrypted
      await expect(middlewareFunction(mockParams, mockNext)).rejects.toThrow(
        "Failed to decrypt account credentials"
      );
    });
  });

  describe("Non-Account Models", () => {
    it("should not process other models", async () => {
      const mockParams = {
        model: "User",
        action: "create" as const,
        args: {
          data: {
            email: "test@example.com",
            name: "Test User",
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      // Should pass through unchanged
      expect(result.args.data).toEqual({
        email: "test@example.com",
        name: "Test User",
      });
    });

    it("should not process Account queries without token fields", async () => {
      const mockParams = {
        model: "Account",
        action: "findUnique" as const,
        args: {
          where: { id: "account-id" },
          select: {
            id: true,
            providerId: true,
          },
        },
      };

      const result = await callMiddleware(mockPrisma, mockParams);

      // Should pass through without modification
      expect(result.args.select).toEqual({
        id: true,
        providerId: true,
      });
    });
  });

  // Helper function to simulate middleware execution for write operations
  async function callMiddleware(client: any, params: any) {
    if (!middlewareFunction) {
      throw new Error("Middleware not registered");
    }

    // Call middleware with a mock next function that returns the params unchanged
    // This is useful for testing write operations where we check if data was encrypted
    return middlewareFunction(params, async (p: any) => p);
  }
});