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

/** Only expose context already sent by the transport; never include unsaved notes. */
export function contextReferences(context: PageContext): ResearchReference[] {
  const refs: ResearchReference[] = [];
  const add = (id: string, label: string, value?: string | null) => {
    if (value) refs.push({ id, name: `${label}：${value}` });
  };
  const scope = context.catalog_scope;
  if (scope)
    add("scope", "范围", `${scope.region}/${scope.universe}/D${scope.delay}`);
  add("dataset", "数据集", context.dataset_id);
  add("field", "字段", context.field_id);
  add("input", "固定输入", context.input_snapshot_id);
  add("version", "集合版本", context.collection_version);
  add("asset", "研究素材", context.research_asset_id);
  add("experiment", "实验", context.research_experiment_id);
  add("alpha", "Alpha", context.alpha_id);
  add("run", "研究运行", context.research_run_id);
  add("backtest", "回测", context.backtest_run_id);
  if (context.selected_ids?.length)
    add("selection", "已选 Alpha", `${context.selected_ids.length} 条`);
  return refs;
}

export function researchPrompts(context: PageContext): string[] {
  switch (context.page) {
    case "datasets":
      return context.unsaved_field_selection
        ? ["解释当前数据集的字段和适用场景"]
        : context.input_snapshot_id
          ? [
              "分析这个固定输入中的字段，提出可验证的研究假设",
              "基于这个固定输入构建候选，并预览回测",
            ]
          : [
              "解释当前数据集的字段和适用场景",
              "如何选择字段并保存为固定研究输入？",
            ];
    case "templates":
      return [
        "解释当前模板的经济含义和变量组合",
        "检查当前研究输入与模板是否匹配",
      ];
    case "variants":
      return [
        "分析种子 Alpha，提出结构与字段变体思路",
        "比较结构变体与市场设置变体的适用场景",
      ];
    case "features":
      return ["解释当前特征方案的处理步骤", "根据固定输入提出可验证的特征假设"];
    default:
      return [
        "查询当前研究对象与已有结果",
        "介绍从字段选择到候选回测的研究流程",
      ];
  }
}

export type WorkspacePage = PageContext["page"] | "mcp-keys";
const contextLabels: Record<
  PageContext["page"],
  (context: PageContext) => string
> = {
  fields: () => "上下文：字段目录",
  preparations: () => "上下文：数据准备",
  home: () => "上下文：首页看板",
  alphas: (context) =>
    `上下文：${context.alpha_id ? `Alpha ${context.alpha_id}` : "Alpha 列表"}${context.selected_ids?.length ? ` · 已选 ${context.selected_ids.length} 条` : ""}`,
  operators: () => "上下文：算子库",
  templates: (context) =>
    `上下文：模板工坊${context.research_asset_id ? ` · ${context.research_asset_id}` : ""}${context.research_experiment_id ? ` · 实验 ${context.research_experiment_id}` : ""}`,
  quantflow: (context) =>
    `上下文：QuantFlow${context.research_run_id ? ` · ${context.research_run_id}` : ""}`,
  pipeline: (context) =>
    `上下文：研究流水线${context.research_run_id ? ` · ${context.research_run_id}` : ""}`,
  features: () => "上下文：特征工程",
  variants: () => "上下文：Alpha 变体",
  account: () => "上下文：个人信息页",
  backtests: () => "上下文：回测研究",
  datasets: (context) =>
    `上下文：${context.dataset_id ?? "数据目录"}${context.catalog_scope ? ` · ${context.catalog_scope.region}/${context.catalog_scope.universe}/D${context.catalog_scope.delay}` : ""}${context.input_snapshot_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 value = hash.replace(/^#/, "").split("?")[0];
  const page = value.startsWith("quantflow/") ? "quantflow" : value;
  if (page === "mcp-keys") return page;
  return Object.hasOwn(contextLabels, page) ? (page as WorkspacePage) : "home";
}

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_feature: { page: "features", chat: "responsive" },
  open_template: { page: "templates", chat: "responsive" },
  open_experiment: { page: "templates", chat: "responsive" },
  open_variant: { page: "variants", chat: "responsive" },
  open_conversation: { chat: "open" },
  open_research_input: { page: "preparations", 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;
}