import type { CharacterValues, SheetWidget, SystemDefinition } from '../shared/types.ts';
import { computeDerived } from '../shared/derived.ts';

type Props = {
  widget: SheetWidget;
  system: SystemDefinition;
};

/** Compact in-widget preview for design mode (no nested canvas). */
export function WidgetPreview({ widget, system }: Props) {
  const values: CharacterValues = {
    attributes: Object.fromEntries(
      (system.bricks.attributes ?? []).map((a) => [a.key, typeof a.default === 'number' ? a.default : 10]),
    ),
    skills: Object.fromEntries(
      (system.bricks.skills ?? []).map((a) => [a.key, typeof a.default === 'number' ? a.default : 0]),
    ),
    resources: Object.fromEntries((system.bricks.resources ?? []).map((a) => [a.key, a.default ?? 0])),
    meta: { notes: '…', title: system.name },
  };
  const derived = computeDerived(system.bricks.derived ?? [], values);
  const bind = widget.bind ?? '';
  const [, key] = bind.split('.');

  if (widget.type === 'section') {
    return <strong>{String(widget.props?.title ?? 'Section')}</strong>;
  }
  if (widget.type === 'dots') {
    const max = Number(widget.props?.max ?? 5);
    const cur = Number(values.attributes?.[key!] ?? 2);
    return (
      <div>
        <div className="muted">{String(widget.props?.label ?? key)}</div>
        <div className="row">
          {Array.from({ length: max }, (_, i) => (
            <span
              key={i}
              style={{
                width: 12,
                height: 12,
                borderRadius: '50%',
                border: '1px solid var(--stroke2)',
                background: i < cur ? 'var(--accent2)' : 'transparent',
              }}
            />
          ))}
        </div>
      </div>
    );
  }
  if (widget.type === 'track' || widget.type === 'resourceBar') {
    const v = Number(values.resources?.[key!] ?? 5);
    const max = Number(widget.props?.max ?? 10);
    return (
      <div>
        <div className="muted">{String(widget.props?.label ?? key)}</div>
        <div style={{ height: 8, background: 'var(--stroke)', borderRadius: 4 }}>
          <div style={{ width: `${(v / max) * 100}%`, height: '100%', background: 'var(--accent)' }} />
        </div>
      </div>
    );
  }
  if (widget.type === 'skillList') {
    return (
      <div className="muted">
        {(system.bricks.skills ?? []).slice(0, 4).map((s) => (
          <div key={s.key}>
            {s.label}: {String(values.skills?.[s.key] ?? 0)}
          </div>
        ))}
        …
      </div>
    );
  }
  if (widget.type === 'notes' || widget.type === 'text') {
    return <div className="muted">{String(values.meta?.notes ?? 'Notes')}</div>;
  }
  if (bind.startsWith('derived.')) {
    return (
      <div>
        <div className="muted">{String(widget.props?.label ?? key)}</div>
        <div style={{ fontSize: 20, fontWeight: 700 }}>{derived[key!] ?? 0}</div>
      </div>
    );
  }
  if (bind.startsWith('attr.')) {
    return (
      <div>
        <div className="muted">{String(widget.props?.label ?? key)}</div>
        <div style={{ fontSize: 20, fontWeight: 700 }}>{String(values.attributes?.[key!] ?? 10)}</div>
      </div>
    );
  }
  return <div className="muted">{widget.type}</div>;
}