/*
|--------------------------------------------------------------------------
| Agência PSI — Edge Function: asaas-create-payment-record
|--------------------------------------------------------------------------
| Cria cobrança Asaas pra um financial_record existente.
|
| ⚠️ STUB FOUNDATION — chamadas reais ao Asaas API marcadas TODO.
| Fluxo completo descrito em DESIGN_ASAAS_GATEWAY.md §6.
|
| Input (body JSON):
|   {
|     tenant_id: uuid,
|     financial_record_id: uuid,
|     billing_type: 'PIX' | 'BOLETO' | 'CREDIT_CARD',
|     due_date?: 'YYYY-MM-DD'  // default = financial_record.due_date
|   }
|
| Output (JSON):
|   {
|     ok: true,
|     payment: {
|       asaas_payment_id, payment_url, pix_qr_code?, pix_copy_paste?, bank_slip_url?
|     }
|   }
|
| Errors:
|   400 — input inválido
|   403 — gateway não habilitado pro tenant
|   404 — record não encontrado
|   500 — erro Asaas
|--------------------------------------------------------------------------
*/
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',
    'Access-Control-Allow-Methods': 'POST, OPTIONS'
};

function json(body: unknown, status = 200) {
    return new Response(JSON.stringify(body), {
        status,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' }
    });
}

Deno.serve(async (req: Request) => {
    if (req.method === 'OPTIONS') return new Response('ok', { headers: corsHeaders });
    if (req.method !== 'POST') return json({ ok: false, error: 'method_not_allowed' }, 405);

    try {
        const body = (await req.json().catch(() => null)) as Record<string, unknown> | null;
        if (!body) return json({ ok: false, error: 'invalid_body' }, 400);

        const tenantId = String(body.tenant_id || '');
        const recordId = String(body.financial_record_id || '');
        const billingType = String(body.billing_type || 'PIX');
        const dueDateOverride = body.due_date ? String(body.due_date) : null;

        if (!tenantId || !recordId) return json({ ok: false, error: 'missing_fields' }, 400);
        if (!['PIX', 'BOLETO', 'CREDIT_CARD'].includes(billingType)) {
            return json({ ok: false, error: 'invalid_billing_type' }, 400);
        }

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

        // 1. Verifica gateway habilitado + lê API key do tenant
        const { data: settings } = await supa
            .from('payment_settings')
            .select('asaas_enabled, asaas_environment, asaas_api_key_sandbox, asaas_api_key_prod')
            .eq('tenant_id', tenantId)
            .maybeSingle();

        if (!settings?.asaas_enabled) {
            return json({ ok: false, error: 'gateway_not_enabled_for_tenant' }, 403);
        }

        const environment = settings.asaas_environment || 'sandbox';
        const apiKey = environment === 'prod' ? settings.asaas_api_key_prod : settings.asaas_api_key_sandbox;
        const apiUrl = environment === 'prod'
            ? Deno.env.get('ASAAS_API_URL_PROD') || 'https://api.asaas.com/v3'
            : Deno.env.get('ASAAS_API_URL_SANDBOX') || 'https://sandbox.asaas.com/api/v3';

        if (!apiKey) {
            return json({ ok: false, error: 'api_key_missing_for_environment', environment }, 403);
        }

        // 2. Lê financial_record + patient
        const { data: record } = await supa
            .from('financial_records')
            .select('id, tenant_id, patient_id, amount, due_date, description, status, deleted_at, agenda_evento_id')
            .eq('id', recordId)
            .eq('tenant_id', tenantId)
            .is('deleted_at', null)
            .maybeSingle();

        if (!record) return json({ ok: false, error: 'record_not_found' }, 404);
        if (record.status !== 'pending') {
            return json({ ok: false, error: `record_not_pending (status=${record.status})` }, 409);
        }
        if (!record.patient_id) return json({ ok: false, error: 'record_has_no_patient' }, 400);

        const { data: patient } = await supa
            .from('patients')
            .select('id, nome_completo, email_principal, telefone, cpf')
            .eq('id', record.patient_id)
            .maybeSingle();

        if (!patient) return json({ ok: false, error: 'patient_not_found' }, 404);
        if (!patient.cpf) return json({ ok: false, error: 'patient_missing_cpf_required_by_asaas' }, 400);

        // 3. Garante customer no Asaas (chama interna asaas-create-customer-patient OU inline)
        // TODO Fase B: chamar Edge Function asaas-create-customer-patient ou inline upsert.
        // Por ora, busca cache local — se não existe, retorna erro.
        let { data: customer } = await supa
            .from('asaas_customers')
            .select('id, asaas_customer_id')
            .eq('tenant_id', tenantId)
            .eq('patient_id', patient.id)
            .eq('environment', environment)
            .is('deleted_at', null)
            .maybeSingle();

        if (!customer) {
            // TODO Fase B: criar customer via POST /customers no Asaas
            return json({
                ok: false,
                error: 'customer_not_cached_TODO_create_via_asaas_api',
                hint: 'Implementar inline ou via chamada asaas-create-customer-patient'
            }, 501);
        }

        // 4. POST /payments no Asaas
        // TODO Fase B: fetch real à Asaas API
        const asaasPayload = {
            customer: customer.asaas_customer_id,
            billingType,
            value: Number(record.amount),
            dueDate: dueDateOverride || record.due_date,
            description: record.description || `Sessão #${record.id.slice(0, 8)}`,
            externalReference: record.id
        };

        // TODO Fase B: substituir mock por fetch real
        // const asaasResp = await fetch(`${apiUrl}/payments`, {
        //     method: 'POST',
        //     headers: { 'Content-Type': 'application/json', 'access_token': apiKey },
        //     body: JSON.stringify(asaasPayload)
        // });
        // const asaasPayment = await asaasResp.json();

        return json({
            ok: false,
            error: 'STUB_not_implemented_TODO_fase_B',
            note: 'Edge Function pronta na estrutura, fetch ao Asaas marcado TODO. Ver DESIGN_ASAAS_GATEWAY.md §9 (Phasing).',
            would_send_to_asaas: asaasPayload,
            api_url: apiUrl,
            environment
        }, 501);

        // 5. INSERT asaas_payments
        // TODO Fase B: salvar resposta + extras (QR code pra PIX)

        // 6. UPDATE financial_records.payment_link
        // TODO Fase B
    } catch (err) {
        console.error('[asaas-create-payment-record] fatal:', err);
        return json({ ok: false, error: String(err) }, 500);
    }
});