import { useState } from 'react';
import { X, Minus, Plus } from 'lucide-react';
import { newId } from '@/lib/ids';
import { getSystem, applyRest } from '@/lib/rules';
import { spendResource, regainResource } from '@/lib/mechanics';
import type { CharacterResource } from '@/lib/schemas';
import { Button } from '@/components/ui/Button';
import { Input, Select } from '@/components/ui/Input';
import { NumberField } from '@/components/ui/NumberField';
import { SheetSection, type SectionProps } from './common';

const RECOVERY_LABEL: Record<CharacterResource['recovery'], string> = {
  short: 'Short rest',
  long: 'Long rest',
  daily: 'Daily',
  none: 'Manual',
};

export function ResourcesSection({ c, update }: SectionProps) {
  const [name, setName] = useState('');
  const sys = getSystem(c.system);

  const addResource = () => {
    if (name.trim() === '') return;
    const r: CharacterResource = { id: newId(), name: name.trim(), current: 1, max: 1, recovery: 'long' };
    update({ resources: [...c.resources, r] });
    setName('');
  };
  const patch = (id: string, p: Partial<CharacterResource>) =>
    update({ resources: c.resources.map((r) => (r.id === id ? { ...r, ...p } : r)) });
  const remove = (id: string) => update({ resources: c.resources.filter((r) => r.id !== id) });

  const rest = (optId: string) => {
    const opt = sys.restOptions.find((o) => o.id === optId);
    if (opt) update(applyRest(c, opt));
  };

  return (
    <SheetSection
      title="Resources & Rest"
      actions={
        <div className="flex gap-2">
          {sys.restOptions.map((o) => (
            <Button key={o.id} size="sm" variant="secondary" onClick={() => rest(o.id)} title={`Restore: ${o.recovers.join(', ')}`}>
              {o.label}
            </Button>
          ))}
        </div>
      }
    >
      <div className="mb-3 flex items-end gap-2">
        <label className="flex-1 min-w-40 text-xs text-muted">
          New resource
          <Input value={name} onChange={(e) => setName(e.target.value)} onKeyDown={(e) => e.key === 'Enter' && addResource()} placeholder="Ki Points, Rage, Focus…" />
        </label>
        <Button variant="primary" onClick={addResource}>Add</Button>
      </div>

      {c.resources.length === 0 ? (
        <p className="text-sm text-muted">No tracked resources. Add rage, ki, sorcery points, focus points, etc.</p>
      ) : (
        <ul className="grid gap-2 sm:grid-cols-2">
          {c.resources.map((r) => (
            <li key={r.id} className="flex items-center gap-2 rounded-md border border-line bg-panel px-3 py-2">
              <Input className="h-8 flex-1" value={r.name} onChange={(e) => patch(r.id, { name: e.target.value })} aria-label="Resource name" />
              <Button size="icon" variant="ghost" disabled={r.current <= 0} onClick={() => { const res = spendResource(c, r.id); if (res.ok) update(res.patch); }} aria-label="Spend"><Minus size={14} aria-hidden /></Button>
              <span className="w-12 text-center text-sm">
                <span className="font-medium text-ink">{r.current}</span>
                <span className="text-muted">/{r.max}</span>
              </span>
              <Button size="icon" variant="ghost" disabled={r.current >= r.max} onClick={() => { const res = regainResource(c, r.id); if (res.ok) update(res.patch); }} aria-label="Regain"><Plus size={14} aria-hidden /></Button>
              <NumberField className="w-14" value={r.max} min={0} onChange={(v) => patch(r.id, { max: v, current: Math.min(v, r.current) })} aria-label="Max" />
              <Select className="w-auto py-1 text-xs" value={r.recovery} onChange={(e) => patch(r.id, { recovery: e.target.value as CharacterResource['recovery'] })}>
                {(['short', 'long', 'daily', 'none'] as const).map((k) => (
                  <option key={k} value={k}>{RECOVERY_LABEL[k]}</option>
                ))}
              </Select>
              <Button size="icon" variant="ghost" className="text-danger" onClick={() => remove(r.id)} aria-label={`Remove ${r.name}`}><X size={14} aria-hidden /></Button>
            </li>
          ))}
        </ul>
      )}
    </SheetSection>
  );
}