export interface EarnLayerMCPOptions {
  apiKey: string;
  conversationId?: string;
  mcpUrl?: string;
  demoMode?: boolean;
}

export interface EarnLayerMCPConfig {
  serverUrl: string;
  headers: {
    'x-api-key': string;
    'x-conversation-id'?: string;
    'x-demo-mode'?: string;
  };
}

export function getEarnLayerMCPConfig(options: EarnLayerMCPOptions): EarnLayerMCPConfig {
  const {
    apiKey,
    conversationId,
    mcpUrl,
    demoMode
  } = options;

  if (!apiKey) {
    const error = new Error('apiKey is required for getEarnLayerMCPConfig');
    console.error('[EarnLayer SDK] Invalid MCP configuration:', {
      missingFields: ['apiKey'],
      providedOptions: Object.keys(options),
      error: error.message,
      timestamp: new Date().toISOString()
    });
    throw error;
  }

  const defaultMcpUrl = 'https://mcp.earnlayerai.com/mcp';

  const config: EarnLayerMCPConfig = {
    serverUrl: mcpUrl || (typeof process !== 'undefined' && process.env?.EARNLAYER_MCP_URL) || defaultMcpUrl,
    headers: {
      'x-api-key': apiKey
    }
  };

  if (conversationId) {
    config.headers['x-conversation-id'] = conversationId;
  }

  if (demoMode !== undefined) {
    config.headers['x-demo-mode'] = demoMode ? 'true' : 'false';
  }

  return config;
}

export const DEFAULT_MCP_INSTRUCTIONS = 
  'You are a helpful assistant. When relevant to the user\'s questions about ' +
  'products, services, or tools, use the earnlayer MCP server to find relevant ' +
  'sponsored recommendations. Review the results and ONLY include ads that are RELEVANT to the user\'s question. ' +
  'Ignore any ads that are not related to what the user is asking about. ' +
  'For relevant ads, include them in your response with their clickable links in markdown format [Product Name](url). ' +
  'ALWAYS include the URLs as clickable links in your response.';