Genarrative/src/components/rpg-entry/rpgEntryRecommendSwipeDeckModel.ts

import type { PlatformPublicGalleryCard } from './rpgEntryWorldPresentation';

export const RECOMMEND_ENTRY_SWIPE_THRESHOLD_PX = 36;
export const RECOMMEND_ENTRY_COMMIT_ANIMATION_MS = 180;
export const RECOMMEND_ENTRY_DRAG_LIMIT_PX = 160;

export type RecommendSwipeDirection = 1 | -1;

export type RecommendSwipeRailState = {
  offsetY: number;
  commitDirection: RecommendSwipeDirection | null;
  isResetting?: boolean;
};

/** 收口推荐卡纵向滑动的纯判定，页面只保留 pointer 与动画副作用。 */
export function hasRecommendDragStarted(deltaY: number) {
  return Math.abs(deltaY) >= RECOMMEND_ENTRY_SWIPE_THRESHOLD_PX / 2;
}

export function clampRecommendDragOffset(
  deltaY: number,
  stageHeight: number,
) {
  const dragLimit =
    stageHeight > 0 ? stageHeight : RECOMMEND_ENTRY_DRAG_LIMIT_PX;
  return Math.max(-dragLimit, Math.min(dragLimit, deltaY));
}

export function resolveRecommendDragCommitDirection(
  deltaY: number,
): RecommendSwipeDirection | null {
  if (Math.abs(deltaY) < RECOMMEND_ENTRY_SWIPE_THRESHOLD_PX) {
    return null;
  }

  return deltaY < 0 ? 1 : -1;
}

export function resolveRecommendCommitOffset(
  direction: RecommendSwipeDirection,
  stageHeight: number,
  viewportHeight: number,
) {
  const commitDistance = stageHeight > 0 ? stageHeight : viewportHeight;
  return direction === 1 ? -commitDistance : commitDistance;
}

export function buildRecommendSwipeRailClassName(
  state: RecommendSwipeRailState,
) {
  if (state.isResetting) {
    return 'platform-recommend-swipe-rail--resetting';
  }

  if (state.commitDirection) {
    return 'platform-recommend-swipe-rail--committing';
  }

  return state.offsetY === 0
    ? 'platform-recommend-swipe-rail--settled'
    : 'platform-recommend-swipe-rail--dragging';
}

export function shouldAnimateRecommendSwipe(params: {
  isAuthenticated: boolean;
  hasActiveEntry: boolean;
  entryCount: number;
}) {
  return (
    params.isAuthenticated && params.hasActiveEntry && params.entryCount > 1
  );
}

export function buildRecommendShareText(params: {
  entry: PlatformPublicGalleryCard;
  publicWorkCode: string;
  detailUrl: string;
}) {
  return `邀请你来玩《${params.entry.worldName}》\n作品号：${params.publicWorkCode}\n${params.detailUrl}`;
}