import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { clearCache } from '../../src/cache';
import { DatabricksMosaicAiChatCompletionProvider } from '../../src/providers/databricks';
import { OpenAiChatCompletionProvider } from '../../src/providers/openai/chat';
import { mockProcessEnv } from '../util/utils';

import type { DatabricksMosaicAiProviderOptions } from '../../src/providers/databricks';

vi.mock('../../src/logger');

describe('Databricks Foundation Model APIs Provider', () => {
  const originalEnv = { ...process.env };
  const workspaceUrl = 'https://test-workspace.cloud.databricks.com';
  const defaultOptions: DatabricksMosaicAiProviderOptions = {
    config: {
      workspaceUrl,
    },
  };

  beforeEach(() => {
    vi.clearAllMocks();
    mockProcessEnv({ ...originalEnv }, { clear: true });
    mockProcessEnv({ DATABRICKS_WORKSPACE_URL: undefined });
    mockProcessEnv({ DATABRICKS_TOKEN: undefined });
  });

  afterEach(async () => {
    await clearCache();
    mockProcessEnv(originalEnv, { clear: true });
  });

  describe('DatabricksMosaicAiChatCompletionProvider', () => {
    it('should create provider for a custom deployed endpoint', () => {
      const provider = new DatabricksMosaicAiChatCompletionProvider(
        'my-custom-endpoint',
        defaultOptions,
      );

      expect(provider).toBeInstanceOf(OpenAiChatCompletionProvider);
      expect(provider.config.apiBaseUrl).toBe(`${workspaceUrl}/serving-endpoints`);
      expect(provider.config.apiKeyEnvar).toBe('DATABRICKS_TOKEN');
    });

    it('should create provider for a pay-per-token endpoint', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          isPayPerToken: true,
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider(
        'databricks-meta-llama-3-3-70b-instruct',
        options,
      );

      expect(provider).toBeInstanceOf(OpenAiChatCompletionProvider);
      expect(provider.config.apiBaseUrl).toBe(workspaceUrl);
      expect(provider.config.apiKeyEnvar).toBe('DATABRICKS_TOKEN');
    });

    it('should create provider with workspace URL from environment variable', () => {
      mockProcessEnv({ DATABRICKS_WORKSPACE_URL: workspaceUrl });

      const options: DatabricksMosaicAiProviderOptions = {
        config: {},
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect(provider).toBeInstanceOf(OpenAiChatCompletionProvider);
      expect(provider.config.apiBaseUrl).toBe(`${workspaceUrl}/serving-endpoints`);
      expect(provider.config.apiKeyEnvar).toBe('DATABRICKS_TOKEN');
    });

    it('should strip trailing slash from workspace URL', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl: `${workspaceUrl}/`,
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect(provider.config.apiBaseUrl).toBe(`${workspaceUrl}/serving-endpoints`);
    });

    it('should throw error when no workspace URL is provided', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {},
      };
      expect(() => new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options)).toThrow(
        'Databricks workspace URL is required. Set it in the config or DATABRICKS_WORKSPACE_URL environment variable.',
      );
    });

    it('should pass through environment variables', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
        },
        env: {
          DATABRICKS_TOKEN: 'test-token',
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect(provider).toBeInstanceOf(OpenAiChatCompletionProvider);
      // The env is passed to the parent constructor, check it's accessible
      expect((provider as any).env).toEqual(
        expect.objectContaining({
          DATABRICKS_TOKEN: 'test-token',
        }),
      );
    });

    it('should pass through OpenAI configuration options', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          temperature: 0.7,
          max_tokens: 100,
          top_p: 0.9,
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect(provider).toBeInstanceOf(OpenAiChatCompletionProvider);
      expect(provider.config.temperature).toBe(0.7);
      expect(provider.config.max_tokens).toBe(100);
      expect(provider.config.top_p).toBe(0.9);
    });

    it('should include usage context as extra body params', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          usageContext: {
            project: 'test-project',
            team: 'engineering',
          },
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect((provider.config as any).extraBodyParams).toEqual({
        usage_context: {
          project: 'test-project',
          team: 'engineering',
        },
      });
    });

    it('should merge usage context with existing extra body params', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          usageContext: {
            project: 'test-project',
          },
          extraBodyParams: {
            custom_param: 'value',
          },
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect((provider.config as any).extraBodyParams).toEqual({
        custom_param: 'value',
        usage_context: {
          project: 'test-project',
        },
      });
    });

    it('should pass through AI Gateway config', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          aiGatewayConfig: {
            enableSafety: true,
            piiHandling: 'mask',
          },
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect(provider.config.aiGatewayConfig).toEqual({
        enableSafety: true,
        piiHandling: 'mask',
      });
    });

    it('should use custom apiKeyEnvar if provided', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          apiKeyEnvar: 'CUSTOM_DATABRICKS_KEY',
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider('my-endpoint', options);

      expect(provider.config.apiKeyEnvar).toBe('CUSTOM_DATABRICKS_KEY');
    });
  });

  describe('getApiUrl method', () => {
    it('should return custom URL for pay-per-token endpoints', () => {
      const options: DatabricksMosaicAiProviderOptions = {
        config: {
          workspaceUrl,
          isPayPerToken: true,
        },
      };
      const provider = new DatabricksMosaicAiChatCompletionProvider(
        'databricks-meta-llama-3-3-70b-instruct',
        options,
      );

      // Use type assertion to access protected method
      const url = (provider as any).getApiUrl();

      expect(url).toBe(
        `${workspaceUrl}/serving-endpoints/databricks-meta-llama-3-3-70b-instruct/invocations`,
      );
    });

    it('should use parent class URL for custom endpoints', () => {
      const provider = new DatabricksMosaicAiChatCompletionProvider(
        'my-custom-endpoint',
        defaultOptions,
      );

      // Since we're extending OpenAI provider, it should use the OpenAI URL pattern
      const url = (provider as any).getApiUrl();

      // For custom endpoints, getApiUrl returns the base URL (apiBaseUrl)
      // The /chat/completions path is added later in the callApi method
      expect(url).toBe(`${workspaceUrl}/serving-endpoints`);
    });
  });
});