import React, { useMemo, useState } from 'react';
import { api, errorMessage } from '../../services/apiClient.ts';
import type { Cycle, InitialBalanceResult } from '../../types/api.ts';
import { formatNumber } from '../../utils/format.ts';

interface InitialBalanceCardProps {
  cycle: Cycle;
  onSaved: () => void;
}

const InitialBalanceCard: React.FC<InitialBalanceCardProps> = ({ cycle, onSaved }) => {
  const [balanceDate, setBalanceDate] = useState(cycle.start_date);
  const [manualEntry, setManualEntry] = useState<string>(
    cycle.feed_initial_balance > 0 ? String(cycle.feed_initial_balance) : ''
  );
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [result, setResult] = useState<InitialBalanceResult | null>(null);

  const canSave = useMemo(
    () => balanceDate !== '' && manualEntry !== '' && Number(manualEntry) >= 0 && !saving,
    [balanceDate, manualEntry, saving]
  );

  const handleSave = async () => {
    if (!canSave) return;
    setSaving(true);
    setError(null);
    try {
      const saved = await api.cycles.initialBalance(cycle.id, {
        date: balanceDate,
        feed_in_manual: Number(manualEntry),
      });
      setResult(saved);
      onSaved();
    } catch (err) {
      setError(errorMessage(err));
    } finally {
      setSaving(false);
    }
  };

  const accuracy = result?.accuracy;
  const accuracyLabel = accuracy == null ? 'N/A' : `${formatNumber(accuracy, 1)}%`;
  const accuracyColor =
    accuracy == null
      ? 'text-gray-500'
      : accuracy >= 95
        ? 'text-green-600'
        : accuracy >= 80
          ? 'text-yellow-600'
          : 'text-red-600';

  return (
    <div className="bg-gradient-to-br from-blue-50 to-indigo-50 p-6 rounded-xl shadow-sm border-2 border-blue-200">
      <div className="flex items-center gap-3 mb-4">
        <div className="bg-blue-500 text-white p-3 rounded-lg">
          <i className="fa-solid fa-boxes-packing text-2xl"></i>
        </div>
        <div>
          <h2 className="text-xl font-bold text-gray-800">Saldo Awal</h2>
          <p className="text-sm text-gray-600">
            Masukkan saldo awal karung pakan pada tanggal tertentu, lalu bandingkan dengan deteksi
            IoT.
          </p>
        </div>
      </div>

      <div className="bg-white rounded-lg p-6 border border-blue-200">
        <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
          <div>
            <label
              htmlFor="initial-balance-date"
              className="text-sm font-semibold text-gray-700 block mb-1"
            >
              Tanggal
            </label>
            <input
              id="initial-balance-date"
              type="date"
              value={balanceDate}
              onChange={(event) => setBalanceDate(event.target.value)}
              className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:ring-blue-500 focus:border-blue-500 text-sm"
            />
          </div>
          <div>
            <label
              htmlFor="initial-balance-manual"
              className="text-sm font-semibold text-gray-700 block mb-1"
            >
              Feed In Manual (karung)
            </label>
            <input
              id="initial-balance-manual"
              type="number"
              min={0}
              value={manualEntry}
              onChange={(event) => setManualEntry(event.target.value)}
              placeholder="Contoh: 120"
              className="w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:ring-blue-500 focus:border-blue-500 text-sm"
            />
          </div>
        </div>

        {error && (
          <p className="mt-3 text-sm font-semibold text-red-700 bg-red-50 border border-red-200 rounded-lg p-3">
            {error}
          </p>
        )}

        <div className="mt-4 flex flex-col sm:flex-row sm:items-center sm:justify-between gap-3">
          <button
            type="button"
            onClick={handleSave}
            disabled={!canSave}
            className="inline-flex items-center gap-2 rounded-lg bg-blue-600 px-4 py-2 text-sm font-semibold text-white transition-colors hover:bg-blue-700 disabled:cursor-not-allowed disabled:bg-gray-400"
          >
            <i className={`fa-solid fa-floppy-disk ${saving ? 'fa-spin' : ''}`} />
            <span>{saving ? 'Menyimpan...' : 'Simpan Saldo Awal'}</span>
          </button>
          {cycle.feed_initial_balance > 0 && result == null && (
            <p className="text-sm text-gray-600">
              Saldo awal tersimpan:{' '}
              <strong className="text-blue-700">
                {formatNumber(cycle.feed_initial_balance)} karung
              </strong>
            </p>
          )}
        </div>

        {result && (
          <div className="mt-4 rounded-lg border border-blue-200 bg-blue-50/50 p-4">
            <p className="text-sm font-semibold text-gray-800 mb-3">Perbandingan {result.date}</p>
            <div className="grid grid-cols-1 sm:grid-cols-3 gap-3 text-center">
              <div className="rounded-lg bg-white border border-gray-200 p-3">
                <p className="text-xs font-semibold text-blue-700">Manual</p>
                <p className="text-2xl font-bold text-gray-800">
                  {formatNumber(result.manual)} karung
                </p>
              </div>
              <div className="rounded-lg bg-white border border-gray-200 p-3">
                <p className="text-xs font-semibold text-purple-700">IOT</p>
                <p className="text-2xl font-bold text-gray-800">
                  {result.iot == null ? 'N/A' : `${formatNumber(result.iot)} karung`}
                </p>
              </div>
              <div className="rounded-lg bg-white border border-gray-200 p-3">
                <p className="text-xs font-semibold text-gray-600">Akurasi</p>
                <p className={`text-2xl font-bold ${accuracyColor}`}>{accuracyLabel}</p>
              </div>
            </div>
            {result.sync_error && (
              <p className="mt-3 text-xs text-yellow-700 bg-yellow-50 border border-yellow-200 rounded-lg p-2">
                Gagal menarik data IoT dari karung-web-admin: {result.sync_error}
              </p>
            )}
          </div>
        )}
      </div>
    </div>
  );
};

export default InitialBalanceCard;