import { defineEventHandler, readBody } from 'h3';

// Define an interface for the expected request body (subset of AsnafProfile)
interface AsnafAnalysisRequest {
  monthlyIncome: string;
  otherIncome: string;
  totalIncome: string;
  occupation: string;
  maritalStatus: string;
  dependents: Array<any>; // Or a more specific type if you have one for dependents
  // Add any other fields you deem necessary for OpenAI to analyze
}

interface AidSuggestion {
  nama: string;
  peratusan: string;
}

// Define an interface for the expected OpenAI response structure (and our API response)
interface AsnafAnalysisResponse {
  hadKifayahPercentage: string;
  kategoriAsnaf: string;
  kategoriKeluarga: string;
  cadanganKategori: string;
  statusKelayakan: string;
  cadanganBantuan: AidSuggestion[];
  ramalanJangkaMasaPulih: string;
  rumusan: string;
}

export default defineEventHandler(async (event): Promise<AsnafAnalysisResponse> => {
  const body = await readBody<AsnafAnalysisRequest>(event);

  // --- Placeholder for Actual OpenAI API Call ---
  // In a real application, you would:
  // 1. Retrieve your OpenAI API key securely (e.g., from environment variables)
  const openAIApiKey = process.env.OPENAI_API_KEY;
  if (!openAIApiKey) {
    console.error('OpenAI API key not configured. Please set OPENAI_API_KEY in your .env file.');
    throw createError({ statusCode: 500, statusMessage: 'OpenAI API key not configured' });
  }
  
  // 2. Construct the prompt for OpenAI using the data from `body`.
  //    IMPORTANT: Sanitize or carefully construct any data from `body` included in the prompt to prevent prompt injection.
  const prompt = `You are an expert Zakat administrator. Based on the following applicant data: monthlyIncome: ${body.monthlyIncome}, totalIncome: ${body.totalIncome}, occupation: ${body.occupation}, maritalStatus: ${body.maritalStatus}, dependents: ${body.dependents.length}. 
Return JSON with keys: hadKifayahPercentage, kategoriAsnaf, kategoriKeluarga, cadanganKategori, statusKelayakan, cadanganBantuan, ramalanJangkaMasaPulih, rumusan. 
For 'cadanganBantuan', provide a JSON array of objects, where each object has a 'nama' (string, name of the aid) and 'peratusan' (string, e.g., '85%', representing suitability). Suggest 2-3 most relevant aid types. 
Example for cadanganBantuan: [{"nama": "Bantuan Kewangan Bulanan", "peratusan": "90%"}, {"nama": "Bantuan Makanan Asas", "peratusan": "75%"}].
Full JSON Example: {"hadKifayahPercentage": "75%", ..., "cadanganBantuan": [{"nama": "Bantuan Kewangan Bulanan", "peratusan": "90%"}], ...}`;
  //    Adjust the prompt to be more detailed and specific to your needs and desired JSON output structure.

  // 3. Make the API call to OpenAI
  try {
    const openAIResponse = await fetch('https://api.openai.com/v1/chat/completions', { 
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${openAIApiKey}`,
      },
      body: JSON.stringify({
        model: 'gpt-3.5-turbo', // Or your preferred model like gpt-4
        messages: [{ role: 'user', content: prompt }],
        // For more consistent JSON output, consider using a model version that officially supports JSON mode if available
        // and set response_format: { type: "json_object" }, (check OpenAI documentation for model compatibility)
      }),
    });

    if (!openAIResponse.ok) {
      const errorData = await openAIResponse.text();
      console.error('OpenAI API Error details:', errorData);
      throw createError({ statusCode: openAIResponse.status, statusMessage: `Failed to get analysis from OpenAI: ${openAIResponse.statusText}` });
    }

    const openAIData = await openAIResponse.json();
    
    // Parse the content from the response - structure might vary slightly based on OpenAI model/API version
    // It's common for the JSON string to be in openAIData.choices[0].message.content
    if (openAIData.choices && openAIData.choices[0] && openAIData.choices[0].message && openAIData.choices[0].message.content) {
      const analysisResult = JSON.parse(openAIData.choices[0].message.content) as AsnafAnalysisResponse;
      return analysisResult;
    } else {
      console.error('OpenAI response structure not as expected:', openAIData);
      throw createError({ statusCode: 500, statusMessage: 'Unexpected response structure from OpenAI' });
    }

  } catch (error) {
    console.error('Error during OpenAI API call or parsing:', error);
    // Avoid exposing detailed internal errors to the client if they are not createError objects
    if (typeof error === 'object' && error !== null && 'statusCode' in error) {
        // We can infer error has statusCode here, but to be super safe with TS:
        const e = error as { statusCode: number }; 
        if (e.statusCode) throw e; 
    }
    throw createError({ statusCode: 500, statusMessage: 'Internal server error during AI analysis' });
  }
  // --- End of Actual OpenAI API Call ---

  // The simulated response below this line should be REMOVED once the actual OpenAI call is implemented and working.
  /*
  console.log('Received for analysis in server route:', body);
  await new Promise(resolve => setTimeout(resolve, 2000)); // Simulate API delay

  const totalIncomeNumeric = parseFloat(body.totalIncome);
  let percentage = '50%'; 
  if (totalIncomeNumeric < 1000) percentage = '30%';
  else if (totalIncomeNumeric < 2000) percentage = '65%';
  else if (totalIncomeNumeric < 3000) percentage = '85%';
  else percentage = '110%';
  
  return {
    hadKifayahPercentage: percentage,
    kategoriAsnaf: 'Simulated - Miskin',
    kategoriKeluarga: 'Simulated - Miskin (50-100% HK)',
    cadanganKategori: 'Simulated - Miskin',
    statusKelayakan: 'Simulated - Layak (Miskin)',
    cadanganBantuan: [
      { nama: 'Simulated - Bantuan Kewangan Bulanan', peratusan: '80%' },
      { nama: 'Simulated - Bantuan Pendidikan Anak', peratusan: '65%' }
    ],
    ramalanJangkaMasaPulih: 'Simulated - 6 bulan',
    rumusan: 'Simulated - Pemohon memerlukan perhatian segera.'
  };
  */
});