import { app, HttpRequest, HttpResponseInit, InvocationContext } from '@azure/functions';
import DIContainer from '../DIContainer';
import { ApiResponse, PaginatedResponse, Donation } from '../types';
import { v4 as uuidv4 } from 'uuid';

export async function getDonations(request: HttpRequest, context: InvocationContext): Promise<HttpResponseInit> {
  try {
    await DIContainer.getInstance().initializeServices();
    const { donationsContainer } = DIContainer.getInstance().getServices();

    const page = parseInt(request.query.get('page') || '1');
    const limit = parseInt(request.query.get('limit') || '10');
    const status = request.query.get('status');
    const program = request.query.get('program');

    let query = 'SELECT * FROM c WHERE 1=1';
    const parameters: any[] = [];

    if (status) {
      query += ' AND c.status = @status';
      parameters.push({ name: '@status', value: status });
    }

    if (program) {
      query += ' AND c.program = @program';
      parameters.push({ name: '@program', value: program });
    }

    query += ' ORDER BY c.createdAt DESC';

    const { resources: donations } = await donationsContainer.items
      .query({
        query,
        parameters
      })
      .fetchAll();

    // Simple pagination
    const total = donations.length;
    const pages = Math.ceil(total / limit);
    const startIndex = (page - 1) * limit;
    const endIndex = startIndex + limit;
    const paginatedDonations = donations.slice(startIndex, endIndex);

    const response: PaginatedResponse<Donation> = {
      success: true,
      data: paginatedDonations,
      pagination: {
        page,
        limit,
        total,
        pages
      },
      timestamp: new Date().toISOString()
    };

    return {
      status: 200,
      jsonBody: response,
      headers: {
        'Content-Type': 'application/json',
        'Access-Control-Allow-Origin': '*'
      }
    };
  } catch (error) {
    context.error('Error fetching donations:', error);
    
    const response: ApiResponse = {
      success: false,
      error: 'Failed to fetch donations',
      timestamp: new Date().toISOString()
    };

    return {
      status: 500,
      jsonBody: response,
      headers: {
        'Content-Type': 'application/json',
        'Access-Control-Allow-Origin': '*'
      }
    };
  }
}

app.http('getDonations', {
  methods: ['GET'],
  authLevel: 'anonymous',
  route: 'donations',
  handler: getDonations
});