import { useState, useRef, useEffect } from 'react';

interface PeriodSelectorProps {
  value: number;
  onChange: (days: number) => void;
  animationActive: boolean;
  onAnimate: () => void;
}

const PERIODS = [
  { label: '24h', days: 1 },
  { label: '7 jours', days: 7 },
  { label: '30 jours', days: 30 },
];

const PRESET_DAYS = new Set([1, 7, 30]);

export function PeriodSelector({ value, onChange, animationActive, onAnimate }: PeriodSelectorProps) {
  const [customOpen, setCustomOpen] = useState(false);
  const [inputVal, setInputVal] = useState('');
  const inputRef = useRef<HTMLInputElement>(null);

  // Ouvre le champ custom avec la valeur courante pré-remplie
  const openCustom = () => {
    setInputVal(PRESET_DAYS.has(value) ? '' : String(value));
    setCustomOpen(true);
  };

  useEffect(() => {
    if (customOpen) inputRef.current?.focus();
  }, [customOpen]);

  const commit = () => {
    const n = parseInt(inputVal, 10);
    if (n >= 1 && n <= 365) onChange(n);
    setCustomOpen(false);
  };

  const isCustomActive = !PRESET_DAYS.has(value);

  return (
    <div className="flex gap-1 bg-[#0f1016] border border-[#2e2f3a] rounded-lg p-1 items-center">
      {PERIODS.map(({ label, days }) => (
        <button
          key={days}
          onClick={() => { onChange(days); setCustomOpen(false); }}
          className={`
            px-3 py-1.5 rounded-md text-sm font-medium transition-all duration-200 cursor-pointer
            ${value === days && !customOpen
              ? 'bg-[#d4a843] text-[#0a0b0f] shadow-[0_0_12px_rgba(212,168,67,0.4)]'
              : 'text-[#6b7280] hover:text-[#d4a843] hover:bg-[#1a1b23]'
            }
          `}
        >
          {label}
        </button>
      ))}

      <div className="w-px mx-1 bg-[#2e2f3a] self-stretch" />

      {/* Bouton Personnaliser + champ inline */}
      {customOpen ? (
        <div className="flex items-center gap-1">
          <input
            ref={inputRef}
            type="number"
            min={1}
            max={365}
            value={inputVal}
            onChange={(e) => setInputVal(e.target.value)}
            onKeyDown={(e) => {
              if (e.key === 'Enter') commit();
              if (e.key === 'Escape') setCustomOpen(false);
            }}
            onBlur={commit}
            placeholder="jours"
            className="w-16 px-2 py-1 text-sm bg-[#1a1b23] border border-[#d4a843] rounded-md text-[#d4a843] text-center focus:outline-none tabular-nums [appearance:textfield] [&::-webkit-inner-spin-button]:appearance-none"
          />
          <span className="text-[#6b7280] text-xs">j</span>
        </div>
      ) : (
        <button
          onClick={openCustom}
          className={`
            px-3 py-1.5 rounded-md text-sm font-medium transition-all duration-200 cursor-pointer
            ${isCustomActive
              ? 'bg-[#d4a843] text-[#0a0b0f] shadow-[0_0_12px_rgba(212,168,67,0.4)]'
              : 'text-[#6b7280] hover:text-[#d4a843] hover:bg-[#1a1b23]'
            }
          `}
        >
          {isCustomActive ? `${value} jours` : 'Personnaliser'}
        </button>
      )}

      <div className="w-px mx-1 bg-[#2e2f3a] self-stretch" />

      <button
        onClick={onAnimate}
        className={`
          px-3 py-1.5 rounded-md text-sm font-medium transition-all duration-200 cursor-pointer
          ${animationActive
            ? 'bg-[#d4a843] text-[#0a0b0f] shadow-[0_0_12px_rgba(212,168,67,0.4)]'
            : 'text-[#6b7280] hover:text-[#d4a843] hover:bg-[#1a1b23]'
          }
        `}
      >
        ▶ Animer
      </button>
    </div>
  );
}