import type { PageContext, UIAction } from "./types";

export type WorkspacePage = PageContext["page"];
const contextLabels: Record<WorkspacePage, (context: PageContext) => string> = {
  alphas: (context) =>
    `上下文：${context.alpha_id ? `Alpha ${context.alpha_id}` : "Alpha 列表"}${context.selected_ids?.length ? ` · 已选 ${context.selected_ids.length} 条` : ""}`,
  account: () => "上下文：个人信息页",
  backtests: () => "上下文：回测研究",
  datasets: (context) =>
    `上下文：${context.dataset_id ?? "数据目录"}${context.catalog_scope ? ` · ${context.catalog_scope.region}/${context.catalog_scope.universe}/D${context.catalog_scope.delay}` : ""}${context.template_input_id ? " · 固定研究输入" : context.unsaved_field_selection ? " · 请先保存字段选择" : ""}（不发送未保存备注）`,
};

export function contextLabel(context: PageContext): string {
  return contextLabels[context.page](context);
}

export function pageFromHash(hash: string): WorkspacePage {
  const page = hash.replace(/^#/, "");
  return Object.hasOwn(contextLabels, page)
    ? (page as WorkspacePage)
    : "alphas";
}

type Destination = {
  page?: WorkspacePage;
  chat: "open" | "close" | "responsive";
};
// Exhaustive action destinations prevent a new action silently falling into Alpha.
const destinations: Record<UIAction["type"], Destination> = {
  open_conversation: { chat: "open" },
  open_research_input: { page: "datasets", chat: "close" },
  open_backtest: { page: "backtests", chat: "responsive" },
  open_backtest_preview: { page: "backtests", chat: "responsive" },
  open_alpha: { page: "alphas", chat: "responsive" },
  apply_filters: { page: "alphas", chat: "responsive" },
};

export function actionDestination(action: UIAction): Destination | undefined {
  return Object.hasOwn(destinations, action.type)
    ? destinations[action.type]
    : undefined;
}