import type { PierInput } from './types';

/**
 * Inputs the user can change on the 2단계 cards (spec §5.2 · plan C2). Each one maps to a field of PierInput.
 * Extend this list as more cards are enabled; the tracking below works on any of these keys.
 */
export const EDITABLE_FIELDS = [
  { key: 'copingWidthMm', label: '코핑 폭 B', unit: 'mm' },
  { key: 'copingLengthMm', label: '코핑 길이 L', unit: 'mm' },
  { key: 'pileLengthMm', label: '말뚝 길이', unit: 'mm' },
] as const;

/** Inputs tracked for overrides and pending changes: the numeric cards plus 열별 본수 (an array, compared by value). */
export const TRACKED_KEYS = [...EDITABLE_FIELDS.map((f) => f.key), 'pileRows'] as const;

export type EditableKey = (typeof TRACKED_KEYS)[number];

export const FIELD_LABELS: Record<EditableKey, string> = {
  copingWidthMm: '코핑 폭 B',
  copingLengthMm: '코핑 길이 L',
  pileLengthMm: '말뚝 길이',
  pileRows: '열별 본수',
};

/** Keys whose values differ between two inputs. Arrays are compared by value. */
export function changedKeys(a: PierInput, b: PierInput): EditableKey[] {
  return TRACKED_KEYS.filter((key) => JSON.stringify(a[key]) !== JSON.stringify(b[key]));
}

/**
 * The three values a pier carries while it is edited (spec §5.5, plan B1):
 * - defaults: the values as imported from the sheet (기본값, shown as "기본 3100").
 * - input: the values the 3D model was generated from (생성본).
 * - draft: the values the user currently has in the cards (현재 입력).
 */
export interface PierValues {
  defaults: PierInput;
  input: PierInput;
  draft: PierInput;
}

/** Overrides: draft differs from the imported default (주황 표시, "변경 n건" in the card). */
export function overrideKeys(p: PierValues): EditableKey[] {
  return changedKeys(p.defaults, p.draft);
}

/** Pending: draft differs from the generated model, so the 3D view is out of date (미반영 변경). */
export function pendingKeys(p: PierValues): EditableKey[] {
  return changedKeys(p.input, p.draft);
}

/** Puts one field back to its imported default in the draft. */
export function revertDraft(p: PierValues, key: EditableKey): PierInput {
  return { ...p.draft, [key]: p.defaults[key] };
}