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

type Props = {
  system: SystemDefinition;
  values: CharacterValues;
  mode: 'design' | 'fill' | 'preview';
  selectedWidgetId?: string | null;
  onSelectWidget?: (id: string) => void;
  onChangeValue?: (path: string, value: unknown) => void;
};

function widgetContent(
  widget: SheetWidget,
  system: SystemDefinition,
  values: CharacterValues,
  mode: Props['mode'],
  onChangeValue?: Props['onChangeValue'],
) {
  const bind = widget.bind ?? '';
  const [scope, key] = bind.split('.');
  const editable = mode === 'fill';

  if (widget.type === 'section') {
    return <strong>{String(widget.props?.title ?? widget.id)}</strong>;
  }

  if (widget.type === 'modBadge' || widget.type === 'number' || bind.startsWith('derived.')) {
    const derived = values.derived ?? {};
    let display: string | number = '—';
    if (scope === 'attr') display = (values.attributes?.[key!] as number) ?? '—';
    if (scope === 'resource') display = values.resources?.[key!] ?? '—';
    if (scope === 'derived') display = derived[key!] ?? '—';
    if (editable && scope === 'attr' && typeof display === 'number') {
      return (
        <label>
          <div className="muted">{key}</div>
          <input
            data-testid={`field-${bind}`}
            type="number"
            value={display}
            onChange={(e) => onChangeValue?.(bind, Number(e.target.value))}
          />
        </label>
      );
    }
    return (
      <div data-testid={`field-${bind}`}>
        <div className="muted">{String(widget.props?.label ?? key ?? widget.type)}</div>
        <div style={{ fontSize: 22, fontWeight: 700 }}>{display}</div>
      </div>
    );
  }

  if (widget.type === 'dots') {
    const max = Number(widget.props?.max ?? 5);
    const current =
      scope === 'attr'
        ? Number(values.attributes?.[key!] ?? 0)
        : scope === 'skill'
          ? Number(values.skills?.[key!] ?? 0)
          : 0;
    return (
      <div>
        <div className="muted">{String(widget.props?.label ?? key)}</div>
        <div className="row" data-testid={`field-${bind}`}>
          {Array.from({ length: max }, (_, i) => (
            <button
              key={i}
              type="button"
              disabled={!editable}
              style={{
                width: 18,
                height: 18,
                borderRadius: '50%',
                padding: 0,
                background: i < current ? 'var(--accent2)' : 'transparent',
              }}
              onClick={() => onChangeValue?.(bind, i + 1 === current ? i : i + 1)}
            />
          ))}
        </div>
      </div>
    );
  }

  if (widget.type === 'track' || widget.type === 'resourceBar') {
    const v = values.resources?.[key!] ?? 0;
    const max = Number(widget.props?.max ?? 10);
    return (
      <label>
        <div className="muted">{String(widget.props?.label ?? key)}</div>
        <input
          data-testid={`field-${bind}`}
          type="number"
          disabled={!editable}
          min={0}
          max={max}
          value={v}
          onChange={(e) => onChangeValue?.(bind, Number(e.target.value))}
        />
        <div
          style={{
            marginTop: 6,
            height: 8,
            background: 'var(--stroke)',
            borderRadius: 4,
            overflow: 'hidden',
          }}
        >
          <div
            style={{
              width: `${Math.min(100, (v / max) * 100)}%`,
              height: '100%',
              background: 'var(--accent)',
            }}
          />
        </div>
      </label>
    );
  }

  if (widget.type === 'skillList') {
    const skills = system.bricks.skills ?? [];
    return (
      <div data-testid="skill-list">
        {skills.map((sk) => (
          <div key={sk.key} className="row" style={{ justifyContent: 'space-between' }}>
            <span>{sk.label}</span>
            <input
              data-testid={`field-skill.${sk.key}`}
              type="number"
              disabled={!editable}
              style={{ width: 72 }}
              value={Number(values.skills?.[sk.key] ?? sk.default ?? 0)}
              onChange={(e) => onChangeValue?.(`skill.${sk.key}`, Number(e.target.value))}
            />
          </div>
        ))}
      </div>
    );
  }

  if (widget.type === 'notes' || widget.type === 'text') {
    const metaKey = key || 'notes';
    const text = String(values.meta?.[metaKey] ?? '');
    return (
      <textarea
        data-testid={`field-meta.${metaKey}`}
        disabled={!editable}
        value={text}
        style={{ width: '100%', height: '100%', resize: 'none' }}
        onChange={(e) => onChangeValue?.(`meta.${metaKey}`, e.target.value)}
      />
    );
  }

  if (widget.type === 'locationBar') {
    const zones = (widget.props?.zones as string[]) ?? ['head', 'body', 'arms', 'legs'];
    return (
      <div className="row" data-testid="location-bar">
        {zones.map((z) => (
          <label key={z}>
            <div className="muted">{z}</div>
            <input
              type="number"
              disabled={!editable}
              style={{ width: 64 }}
              value={Number((values.meta?.armor as Record<string, number> | undefined)?.[z] ?? 0)}
              onChange={(e) => {
                const armor = {
                  ...((values.meta?.armor as Record<string, number>) ?? {}),
                  [z]: Number(e.target.value),
                };
                onChangeValue?.('meta.armor', armor);
              }}
            />
          </label>
        ))}
      </div>
    );
  }

  return <div className="muted">{widget.type}</div>;
}

export function SheetRenderer({
  system,
  values,
  mode,
  selectedWidgetId,
  onSelectWidget,
  onChangeValue,
}: Props) {
  const page = system.sheetLayout.pages[0];
  const derived = computeDerived(system.bricks.derived ?? [], values);
  const merged: CharacterValues = { ...values, derived };

  if (!page) return <div className="muted">No pages</div>;

  return (
    <div className="sheetCanvas" data-testid="sheet-canvas">
      {page.widgets.map((w) => (
        <div
          key={w.id}
          className={`widget${selectedWidgetId === w.id ? ' selected' : ''}`}
          data-testid={`widget-${w.id}`}
          style={{ left: w.frame.x, top: w.frame.y, width: w.frame.w, height: w.frame.h }}
          onClick={() => onSelectWidget?.(w.id)}
        >
          {widgetContent(w, system, merged, mode, onChangeValue)}
        </div>
      ))}
    </div>
  );
}