import { serve } from 'https://deno.land/std@0.168.0/http/server.ts';
import { createClient } from 'https://esm.sh/@supabase/supabase-js@2';

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type',
};

serve(async (req) => {
  if (req.method === 'OPTIONS') return new Response('ok', { headers: corsHeaders });

  try {
    const { invoice_id, invoice_ref } = await req.json();
    const invoiceRef = invoice_ref || invoice_id;

    if (!invoiceRef) {
      return new Response(JSON.stringify({ error: 'invoice_ref required' }), {
        status: 400,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      });
    }

    const supabase = createClient(
      Deno.env.get('SUPABASE_URL')!,
      Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!,
    );

    let invoice = null;
    let error = null;

    ({ data: invoice, error } = await supabase
      .from('invoices')
      .select('id, invoice_number, invoice_date, due_date, total, status, bill_to, company_id')
      .eq('id', invoiceRef)
      .maybeSingle());

    if (!invoice) {
      ({ data: invoice, error } = await supabase
        .from('invoices')
        .select('id, invoice_number, invoice_date, due_date, total, status, bill_to, company_id')
        .eq('invoice_number', invoiceRef)
        .maybeSingle());
    }

    if (error || !invoice) {
      return new Response(JSON.stringify({ error: 'Invoice not found' }), {
        status: 404,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' },
      });
    }

    const { data: company } = invoice.company_id
      ? await supabase
          .from('companies')
          .select('name, email')
          .eq('id', invoice.company_id)
          .maybeSingle()
      : { data: null };

    return new Response(JSON.stringify({ invoice: { ...invoice, companies: company || null } }), {
      headers: { ...corsHeaders, 'Content-Type': 'application/json' },
    });
  } catch (err) {
    console.error(err);
    return new Response(JSON.stringify({ error: err.message }), {
      status: 500,
      headers: { ...corsHeaders, 'Content-Type': 'application/json' },
    });
  }
});