/**
 * Test API Client for Daily Notification Plugin
 * 
 * Demonstrates how to integrate with the test API server
 * for validating plugin functionality.
 * 
 * @author Matthew Raymer
 * @version 1.0.0
 */

export interface TestAPIConfig {
  baseUrl: string;
  timeout: number;
}

export interface NotificationContent {
  id: string;
  slotId: string;
  title: string;
  body: string;
  timestamp: number;
  priority: string;
  category: string;
  actions: Array<{ id: string; title: string }>;
  metadata: {
    source: string;
    version: string;
    generated: string;
  };
}

export interface APIResponse<T> {
  data?: T;
  error?: string;
  status: number;
  etag?: string;
  fromCache: boolean;
}

export class TestAPIClient {
  private config: TestAPIConfig;
  private etagCache = new Map<string, string>();

  constructor(config: TestAPIConfig) {
    this.config = config;
  }

  /**
   * Fetch notification content for a specific slot
   * @param slotId - Slot identifier (e.g., 'slot-08:00')
   * @returns Promise<APIResponse<NotificationContent>>
   */
  async fetchContent(slotId: string): Promise<APIResponse<NotificationContent>> {
    const url = `${this.config.baseUrl}/api/content/${slotId}`;
    const headers: Record<string, string> = {};

    // Add ETag for conditional request if we have cached content
    const cachedETag = this.etagCache.get(slotId);
    if (cachedETag) {
      headers['If-None-Match'] = cachedETag;
    }

    try {
      const response = await fetch(url, {
        method: 'GET',
        headers,
        signal: AbortSignal.timeout(this.config.timeout)
      });

      const etag = response.headers.get('ETag');
      const fromCache = response.status === 304;

      if (fromCache) {
        return {
          status: response.status,
          fromCache: true,
          etag: cachedETag
        };
      }

      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }

      const data = await response.json();

      // Cache ETag for future conditional requests
      if (etag) {
        this.etagCache.set(slotId, etag);
      }

      return {
        data,
        status: response.status,
        etag,
        fromCache: false
      };

    } catch (error) {
      return {
        error: error instanceof Error ? error.message : 'Unknown error',
        status: 0,
        fromCache: false
      };
    }
  }

  /**
   * Test error scenarios
   * @param errorType - Type of error to simulate
   * @returns Promise<APIResponse<any>>
   */
  async testError(errorType: string): Promise<APIResponse<any>> {
    const url = `${this.config.baseUrl}/api/error/${errorType}`;

    try {
      const response = await fetch(url, {
        method: 'GET',
        signal: AbortSignal.timeout(this.config.timeout)
      });

      const data = await response.json();

      return {
        data,
        status: response.status,
        fromCache: false
      };

    } catch (error) {
      return {
        error: error instanceof Error ? error.message : 'Unknown error',
        status: 0,
        fromCache: false
      };
    }
  }

  /**
   * Get API health status
   * @returns Promise<APIResponse<any>>
   */
  async getHealth(): Promise<APIResponse<any>> {
    const url = `${this.config.baseUrl}/health`;

    try {
      const response = await fetch(url, {
        method: 'GET',
        signal: AbortSignal.timeout(this.config.timeout)
      });

      const data = await response.json();

      return {
        data,
        status: response.status,
        fromCache: false
      };

    } catch (error) {
      return {
        error: error instanceof Error ? error.message : 'Unknown error',
        status: 0,
        fromCache: false
      };
    }
  }

  /**
   * Get API metrics
   * @returns Promise<APIResponse<any>>
   */
  async getMetrics(): Promise<APIResponse<any>> {
    const url = `${this.config.baseUrl}/api/metrics`;

    try {
      const response = await fetch(url, {
        method: 'GET',
        signal: AbortSignal.timeout(this.config.timeout)
      });

      const data = await response.json();

      return {
        data,
        status: response.status,
        fromCache: false
      };

    } catch (error) {
      return {
        error: error instanceof Error ? error.message : 'Unknown error',
        status: 0,
        fromCache: false
      };
    }
  }

  /**
   * Clear ETag cache
   */
  clearCache(): void {
    this.etagCache.clear();
  }

  /**
   * Get cached ETags
   * @returns Map of slotId to ETag
   */
  getCachedETags(): Map<string, string> {
    return new Map(this.etagCache);
  }
}

/**
 * Platform-specific API configuration
 */
export const getAPIConfig = (): TestAPIConfig => {
  // Detect platform and set appropriate base URL
  if (typeof window !== 'undefined') {
    // Web/Electron
    return {
      baseUrl: 'http://localhost:3001',
      timeout: 12000 // 12 seconds
    };
  }

  // Default configuration
  return {
    baseUrl: 'http://localhost:3001',
    timeout: 12000
  };
};

/**
 * Usage examples for test apps
 */
export const TestAPIExamples = {
  /**
   * Basic content fetching example
   */
  async basicFetch() {
    const client = new TestAPIClient(getAPIConfig());
    
    console.log('Testing basic content fetch...');
    const result = await client.fetchContent('slot-08:00');
    
    if (result.error) {
      console.error('Error:', result.error);
    } else {
      console.log('Success:', result.data);
      console.log('ETag:', result.etag);
      console.log('From cache:', result.fromCache);
    }
  },

  /**
   * ETag caching example
   */
  async etagCaching() {
    const client = new TestAPIClient(getAPIConfig());
    
    console.log('Testing ETag caching...');
    
    // First request
    const result1 = await client.fetchContent('slot-08:00');
    console.log('First request:', result1.fromCache ? 'From cache' : 'Fresh content');
    
    // Second request (should be from cache)
    const result2 = await client.fetchContent('slot-08:00');
    console.log('Second request:', result2.fromCache ? 'From cache' : 'Fresh content');
  },

  /**
   * Error handling example
   */
  async errorHandling() {
    const client = new TestAPIClient(getAPIConfig());
    
    console.log('Testing error handling...');
    
    const errorTypes = ['timeout', 'server-error', 'not-found', 'rate-limit'];
    
    for (const errorType of errorTypes) {
      const result = await client.testError(errorType);
      console.log(`${errorType}:`, result.status, result.error || 'Success');
    }
  },

  /**
   * Health check example
   */
  async healthCheck() {
    const client = new TestAPIClient(getAPIConfig());
    
    console.log('Testing health check...');
    const result = await client.getHealth();
    
    if (result.error) {
      console.error('Health check failed:', result.error);
    } else {
      console.log('API is healthy:', result.data);
    }
  }
};