'use client';
import { FunctionComponent } from 'react';
import { useLocale, useTranslations } from 'next-intl';
import { Box, Paper, Skeleton, Stack, Typography } from '@mui/material';
import { AppButton, AppIcon, InstallmentScheduleRow, Money, PlaceholderScreen } from '@/components';
import { formatShamsiDate } from '@/utils';
import { useWalletInstallments } from '@/services/bnpl';
import type { WalletInstallmentPlan } from '@/services/bnpl/types';

/**
 * D5 · پیگیری اقساط — the Wallet view of active installment plans. It reads `useWalletInstallments` and
 * renders **provider-reported** status: an outstanding-balance card (terracotta), the next-installment
 * date + a provider hand-off «پرداخت زودهنگام» (early-pay is a *provider* action, never a Balinyaar
 * transaction), the per-installment due list with status chips, and the ownership note (Balinyaar displays,
 * it does not manage, this schedule). Self-contained under the Wallet route so f12 nurse-earnings content
 * can land beside it later.
 */
const WalletInstallments: FunctionComponent = () => {
  const t = useTranslations('bnpl');
  const tc = useTranslations('common');
  const { data: plans, isLoading, isError, refetch } = useWalletInstallments();

  return (
    <Stack sx={{ gap: 2, maxWidth: 560, mx: 'auto', width: '100%' }}>
      <Typography variant="h6" component="h1">
        {t('wallet_title')}
      </Typography>

      {isLoading ? (
        <Stack sx={{ gap: 1.5 }}>
          <Skeleton variant="rounded" height={128} />
          <Skeleton variant="rounded" height={56} />
          <Skeleton variant="rounded" height={56} />
        </Stack>
      ) : isError ? (
        <Paper elevation={0} sx={{ p: 3, borderRadius: 2, border: '1px solid', borderColor: 'divider', textAlign: 'center' }}>
          <Stack sx={{ gap: 1, alignItems: 'center' }}>
            <AppIcon icon="warning" size={36} color="var(--bal-warning)" />
            <Typography variant="subtitle2" sx={{ fontWeight: 700 }}>
              {t('wallet_error_title')}
            </Typography>
            <Typography variant="body2" sx={{ color: 'text.secondary' }}>
              {t('wallet_error_body')}
            </Typography>
            <AppButton variant="outlined" color="secondary" onClick={() => refetch()} sx={{ mt: 1 }}>
              {tc('retry')}
            </AppButton>
          </Stack>
        </Paper>
      ) : !plans || plans.length === 0 ? (
        <PlaceholderScreen icon="installments" title={t('wallet_empty_title')} description={t('wallet_empty_body')} />
      ) : (
        <Stack sx={{ gap: 3 }}>
          {plans.map((plan) => (
            <InstallmentPlanSection key={plan.bnplTransactionId} plan={plan} />
          ))}
        </Stack>
      )}
    </Stack>
  );
};

function InstallmentPlanSection({ plan }: { plan: WalletInstallmentPlan }) {
  const t = useTranslations('bnpl');
  const locale = useLocale();
  const providerName = t(`provider_${plan.providerCode}`);

  const handleEarlyPay = () => {
    // Early-pay is a PROVIDER action — hand off to the provider, never a Balinyaar payment.
    if (plan.earlyPayUrl) window.open(plan.earlyPayUrl, '_blank', 'noopener,noreferrer');
  };

  return (
    <Stack sx={{ gap: 1.5 }}>
      {/* Outstanding-balance card — terracotta financial accent; contrast text is scheme-stable. */}
      <Paper
        elevation={0}
        sx={{ p: 2.25, borderRadius: 3, backgroundColor: 'var(--bal-secondary)', color: 'var(--bal-secondary-contrast)' }}
      >
        <Typography variant="caption" sx={{ opacity: 0.85 }}>
          {t('outstanding_balance')}
        </Typography>
        <Money amountIrr={plan.outstandingBalanceIrr} size="lg" sx={{ fontWeight: 800, mt: 0.25 }} />
        <Typography variant="caption" sx={{ opacity: 0.85, display: 'block', mt: 0.5 }}>
          {plan.serviceLabel}
        </Typography>

        {plan.nextDueDate ? (
          <Stack direction="row" sx={{ justifyContent: 'space-between', alignItems: 'flex-end', mt: 1.5, gap: 1.5 }}>
            <Box>
              <Typography variant="caption" sx={{ opacity: 0.85 }}>
                {t('next_installment')} · {formatShamsiDate(`${plan.nextDueDate}T00:00:00`, locale)}
              </Typography>
              {plan.nextAmountIrr ? (
                <Money amountIrr={plan.nextAmountIrr} size="sm" sx={{ fontWeight: 800 }} />
              ) : null}
            </Box>
            {plan.earlyPayUrl ? (
              <AppButton
                color="primary"
                variant="contained"
                size="small"
                onClick={handleEarlyPay}
                sx={{ flex: 'none' }}
              >
                {t('early_pay')}
              </AppButton>
            ) : null}
          </Stack>
        ) : null}
      </Paper>

      <Typography variant="subtitle2" sx={{ fontWeight: 700 }}>
        {t('due_dates')}
      </Typography>
      <Stack sx={{ gap: 1 }}>
        {plan.installments.map((row) => (
          <InstallmentScheduleRow key={`${row.kind}-${row.sequence}`} row={row} showStatus />
        ))}
      </Stack>

      {/* Ownership note: Balinyaar displays, it does not manage, this provider-owned schedule. */}
      <Stack direction="row" sx={{ gap: 0.75, alignItems: 'flex-start', px: 0.5 }}>
        <AppIcon icon="info" size={16} color="var(--bal-text-secondary)" />
        <Typography variant="caption" sx={{ color: 'text.secondary' }}>
          {t('provider_owned_note', { provider: providerName })}
        </Typography>
      </Stack>
    </Stack>
  );
}

export default WalletInstallments;