import { SimulationRemissionImports } from './simulation-remission-imports';
import { SimulationObjectiveImports } from './simulation-objective-imports';
import { SimulationMiners } from './simulation-miners';
import { SimulationReturnees } from './simulation-returnees';
import { SimulationDigital } from './simulation-digital';
import { SimulationTravel } from './simulation-travel';
import { SimulationTravelEvents } from './simulation-travel-events';
import { SimulationForeignOperations } from './simulation-foreign-operations';
import { SimulationCurrencyEvents } from './simulation-currency-events';
import { SimulationPropertyTransfers } from './simulation-property-transfers';
import { SimulationGoodsPresumptions } from './simulation-goods-presumptions';
import { InvestmentContextAssessment } from './investment-context-assessment';
import { useEffect, useRef, useState } from 'react';
import { monthlyIvaInput, monthlyIvaKey, monthlySalesFromDraft, readMonthlyIvaRecord, readMonthlyIvaSettings, recoverMonthlyIvaRecord, monthlyIvaCashTreatment, type MonthlyIvaInput, type MonthlyIvaSettings } from '@/lib/monthly-iva';
import { fiscalQaRows } from '@/lib/fiscal-qa-preview';
import { type ApiSimulationExecutionV1 } from '@/lib/simulation-contract';
import { SimulationModeloA } from './simulation-modelo-a';
import { SimulationAcquisitions } from './simulation-acquisitions';
import { SimulationImportExemptions } from './simulation-import-exemptions';
import { SimulationPublicAuthorityBase } from './simulation-public-authority-base';
import { SimulationCommissionBase } from './simulation-commission-base';
import { SimulationActSaleBase } from './simulation-act-sale-base';
import { SimulationFuelBase } from './simulation-fuel-base';
import { SimulationNoncashBase } from './simulation-noncash-base';
import { SimulationCompositionBase } from './simulation-composition-base';
import { SimulationExclusionBase } from './simulation-exclusion-base';
import { SimulationValueReview } from './simulation-value-review';
import { SimulationServiceNormal } from './simulation-service-normal';
import { SimulationGoodsLocation } from './simulation-goods-location';
import { SimulationServiceLocation } from './simulation-service-location';
import { SimulationListedServices } from './simulation-listed-services';
import { SimulationReducedBases } from './simulation-reduced-bases';
import { SimulationOwnName } from './simulation-own-name';
import { SimulationGoodsAllocation } from './simulation-goods-allocation';
import { SimulationSecondhand } from './simulation-secondhand';
import { SimulationOfferPreparations } from './simulation-offer-preparations';
import { SimulationOperations } from './simulation-operations';

export function SimulationMonthlyIva({draft, busy, onCalculate, onChange}: {
    draft: Record<string, unknown>; busy: boolean;
    onCalculate: (input: MonthlyIvaInput) => Promise<ApiSimulationExecutionV1 | null | undefined>;
    onChange: (field: string, value: string) => void;
}) {
    const settings = readMonthlyIvaSettings(String(draft.monthly_iva_settings ?? ''));
    const record = readMonthlyIvaRecord(String(draft.monthly_iva_snapshot ?? ''));
    const [retry, setRetry] = useState(0);
    const [error, setError] = useState('');
    const [available, setAvailable] = useState<boolean | null>(null);
    const attempt = useRef('');
    const mounted = useRef(true);
    const latestSnapshot = useRef(draft.monthly_iva_snapshot); latestSnapshot.current = draft.monthly_iva_snapshot;
    useEffect(() => { mounted.current = true; return () => { mounted.current = false; }; }, []);
    const callbacks = useRef({onCalculate, onChange}); callbacks.current = {onCalculate, onChange};
    let input: MonthlyIvaInput | null = null; let inputError = ''; let source = '';
    try { source = monthlySalesFromDraft(draft).source; input = monthlyIvaInput(draft, settings); }
    catch (cause) { inputError = cause instanceof Error ? cause.message : 'Reveja a projecção de vendas.'; }
    const key = input ? monthlyIvaKey(input) : '';
    const current = !!(input && record && monthlyIvaKey(record.input) === key);
    const completed = current && record?.execution.status === 'completed';
    const pendingRecord = record && ['queued','running'].includes(record.execution.status) ? record : null;
    const actionKey = pendingRecord ? `recover:${pendingRecord.execution.id}` : key;
    const saveSettings = (patch: Partial<MonthlyIvaSettings>) => onChange('monthly_iva_settings', JSON.stringify({...settings, ...patch}));
    useEffect(() => {
        let active = true;
        fetch('/api/v1/fiscal-consumer', {credentials: 'same-origin', headers: {Accept:'application/json'}}).then(async (response) => {
            if (!response.ok) throw new Error(); const payload = await response.json(); if (active) setAvailable(payload?.data?.enabled === true);
        }).catch(() => {if (active) setError('Não foi possível consultar a disponibilidade da regra. As vendas foram preservadas.');});
        return () => { active = false; };
    }, [retry]);
    useEffect(() => {
        if (!settings.auto || busy || attempt.current === actionKey) return;
        if (!pendingRecord && (!input || input.currency !== 'MZN' || !available || completed)) return;
        const request = pendingRecord?.input ?? input!;
        const savedSnapshot = draft.monthly_iva_snapshot;
        const timer = window.setTimeout(() => {
            attempt.current = actionKey; setError('');
            void (async () => {
                try {
                    let execution;
                    if (pendingRecord) {
                        execution = (await recoverMonthlyIvaRecord(pendingRecord)).execution;
                    } else execution = await callbacks.current.onCalculate(request);
                    if (!execution) throw new Error('O cálculo mensal não foi concluído. As vendas e a versão anterior foram preservadas; tente novamente.');
                    if (!mounted.current || (pendingRecord && latestSnapshot.current !== savedSnapshot)) return;
                    callbacks.current.onChange('monthly_iva_snapshot', JSON.stringify({input:request, execution}));
                } catch (cause) {if (mounted.current) setError(cause instanceof Error ? cause.message : 'Não foi possível calcular o IVA mensal.');}
            })();
        }, 700);
        return () => window.clearTimeout(timer);
    }, [actionKey, key, settings.auto, busy, available, completed, retry]);

    const snapshot = record?.execution.result_snapshot;
    const projection = snapshot?.monthly_projection as {rows?: Array<{date:string; sales_declared:string|null; net_sales:string|null; rate:string|null; vat:string|null; gross_sales:string|null; status:string}>} | undefined;
    return <section className="space-y-3 rounded border border-emerald-700 p-4" aria-label="IVA mensal das vendas projectadas">
        <InvestmentContextAssessment raw={draft.context_applicability_snapshot} />
        <h3 className="font-semibold">IVA mensal das vendas projectadas</h3>
        <p>{source}</p><p>Declare se os preços projectados são sem IVA ou com IVA incluído. Nenhuma taxa é fixada neste formulário; o servidor selecciona a versão publicada.</p>
        <label className="block">Primeiro mês da projecção<input type="month" value={settings.start} min="2026-01" max="2026-12" onChange={(event) => saveSettings({start:event.target.value})} className="block rounded border p-2" /></label>
        <label className="block">Tratamento do IVA nos preços projectados<select value={settings.basis} onChange={(event) => saveSettings({basis:event.target.value as MonthlyIvaSettings['basis']})} className="block rounded border p-2"><option value="unknown">Por indicar</option><option value="net">Vendas sem IVA (base líquida)</option><option value="included">Vendas com IVA incluído</option></select></label>
        <label className="block"><input type="checkbox" checked={settings.declared} onChange={(event) => saveSettings({declared:event.target.checked})} /> Declaro que as vendas projectadas são tributáveis à taxa geral interna e não incluem as operações excluídas deste lote.</label>
        <p className="text-sm">Sem importações, taxas reduzidas, isenções, regimes especiais, deduções, reembolsos ou apuramento final. Valores com IVA incluído permanecem indeterminados neste lote; não se aplica a taxa ao preço bruto.</p>
        <p className="text-sm">{monthlyIvaCashTreatment}</p>
        {!!draft.currency && draft.currency !== "MZN" && <p role="alert">Moeda do projecto: {String(draft.currency)}. A regra disponível aceita apenas MZN. As vendas e a moeda são preservadas, sem conversão; o IVA mensal não pode ser determinado por esta versão.</p>}
        {inputError && <p role="alert">{inputError}</p>}
        {available === null && !error && <p role="status">A consultar a disponibilidade da versão publicada…</p>}
        {available === false && <p role="status">A versão publicada de IVA está indisponível neste ambiente para novas execuções. Os pressupostos e históricos mantêm-se.</p>}
        {record && !current && <p role="alert">As vendas ou os pressupostos mudaram. Os resultados abaixo são históricos e estão desactualizados; não são usados como resultados da projecção actual.</p>}
        {settings.auto && !completed && current && <p role="status">Execução mensal guardada: {record?.execution.status === 'queued' ? 'em fila' : record?.execution.status === 'running' ? 'em processamento' : 'não concluída'}. Pode voltar a consultar sem duplicar.</p>}
        {busy && <p role="status">A actualizar os resultados dependentes das vendas…</p>}
        {error && <p role="alert">{error}</p>}
        <button type="button" disabled={busy || (!pendingRecord && (!available || !input || input.currency !== 'MZN'))} onClick={() => {attempt.current=''; setRetry((value) => value+1); saveSettings({auto:true});}} className="rounded bg-emerald-800 p-2 text-white disabled:opacity-50">{pendingRecord ? 'Recuperar execução mensal admitida pelo mesmo ID' : 'Calcular / actualizar IVA mensal e guardar versão'}</button>
        {pendingRecord && <p>Consulta da execução {pendingRecord.execution.id}. A suspensão de novos cálculos não impede esta recuperação; não é criado outro pedido.</p>}
        {settings.auto && <button type="button" className="ml-3 underline" onClick={() => saveSettings({auto:false})}>Pausar actualização automática</button>}
        {input && <p className="text-sm">{input.monthly_sales.length} meses; moeda {input.currency || 'por indicar'}. Campo vazio significa informação em falta; zero declarado permanece zero. Depois da primeira execução, alterações das vendas actualizam o cálculo enquanto a actualização automática estiver ligada.</p>}
        {projection?.rows && <div className="overflow-x-auto" tabIndex={0}><table className="min-w-full text-sm"><caption>IVA mensal — {current ? 'versão correspondente às entradas' : 'versão histórica'}</caption><thead><tr>{['Mês','Vendas declaradas','Vendas tributáveis sem IVA','Taxa aplicada (%)','IVA calculado','Total com IVA','Estado'].map((label) => <th key={label} className="p-2 text-left">{label}</th>)}</tr></thead><tbody>{projection.rows.map((row) => <tr key={row.date}><th scope="row" className="p-2">{row.date.slice(0,7)}</th><td>{row.sales_declared ?? 'Sem informação'}</td><td>{row.net_sales ?? 'Indeterminado'}</td><td>{row.rate ?? 'Indeterminada'}</td><td>{row.vat ?? 'Indeterminado'}</td><td>{row.gross_sales ?? 'Indeterminado'}</td><td>{{calculated:'Calculado',missing_sales:'Sem informação de vendas',unsupported_basis:'Base líquida não determinada',indeterminate:'Enquadramento ou regra indeterminados'}[row.status] ?? 'Indeterminado'}</td></tr>)}</tbody></table></div>}
        {snapshot && <details><summary>Ver fundamento e relatório da versão guardada</summary><dl>{fiscalQaRows(snapshot).map(([label,value], index) => <div key={index}><dt className="font-semibold">{label}</dt><dd>{value}</dd></div>)}</dl></details>}
        <SimulationOperations draft={draft} onChange={onChange} />
        <SimulationAcquisitions draft={draft} onChange={onChange} />
        <SimulationImportExemptions draft={draft} onChange={onChange} />
        <SimulationObjectiveImports draft={draft} onChange={onChange} />
        <SimulationMiners draft={draft} onChange={onChange} />
        <SimulationRemissionImports draft={draft} onChange={onChange} />
        <SimulationReturnees draft={draft} onChange={onChange} />
        <SimulationPublicAuthorityBase draft={draft} onChange={onChange} />
        <SimulationCommissionBase draft={draft} onChange={onChange} />
        <SimulationActSaleBase draft={draft} onChange={onChange} />
        <SimulationFuelBase draft={draft} onChange={onChange} />
        <SimulationNoncashBase draft={draft} onChange={onChange} />
        <SimulationCompositionBase draft={draft} onChange={onChange} />
        <SimulationExclusionBase draft={draft} onChange={onChange} />
        <SimulationValueReview draft={draft} onChange={onChange} />
        <SimulationServiceNormal draft={draft} onChange={onChange} />
        <SimulationGoodsLocation draft={draft} onChange={onChange} />
        <SimulationServiceLocation draft={draft} onChange={onChange} />
        <SimulationListedServices draft={draft} onChange={onChange} />
        <SimulationReducedBases draft={draft} onChange={onChange} />
        <SimulationOwnName draft={draft} onChange={onChange} />
        <SimulationGoodsAllocation draft={draft} onChange={onChange} />
        <SimulationForeignOperations draft={draft} onChange={onChange} />
        <SimulationDigital draft={draft} onChange={onChange} />
        <SimulationTravel draft={draft} onChange={onChange} />
        <SimulationTravelEvents draft={draft} onChange={onChange} />
        <SimulationCurrencyEvents draft={draft} onChange={onChange} />
        <SimulationPropertyTransfers draft={draft} onChange={onChange} />
        <SimulationGoodsPresumptions draft={draft} onChange={onChange} />
        <SimulationSecondhand draft={draft} onChange={onChange} />
        <SimulationOfferPreparations draft={draft} onChange={onChange} />
        <SimulationModeloA draft={draft} />
    </section>;
}