import type { RuleGroup, RuleGroupKind, RuleGroupScope, RuleGroupSource } from "@umt/contracts";
import { MEDIA_KIND } from "~/components/library/labels.ts";
import { exprToString } from "./expr.ts";

// 规则页文案:类型 / 来源 / 作用范围 / 默认链 / 抑制原因

export const RULE_KIND: Record<RuleGroupKind, { label: string; hint: string }> = {
  acquisition: { label: "订阅", hint: "订阅与版本目标挑资源时用" },
  upgrade: { label: "洗版", hint: "版本目标开了升级时额外叠加" },
  search: { label: "搜索", hint: "手动搜索与 Agent 搜索资源时用" },
};

export const SUPPRESS_NOTE = "停用或删除会留下抑制记录，Agent 不会自动加回；重新启用或手动新建同样的规则后解除。";

export const RULE_SOURCE: Record<RuleGroupSource, string> = {
  manual: "手动",
  chat: "对话",
  agent: "Agent",
};

export const DEFAULT_CHAIN_LABEL: Record<RuleGroupKind, string> = {
  acquisition: "订阅默认",
  upgrade: "洗版默认",
  search: "搜索默认",
};

export const SUPPRESS_REASON: Record<string, string> = {
  deleted: "删除",
  disabled: "停用",
  "status:disabled": "停用",
  "status:deleted": "删除",
  edited: "修改语义",
};
export const suppressReason = (r: string | null) => (r ? (SUPPRESS_REASON[r] ?? r) : "未注明");

/** 作用范围摘要:空 = 全部;旧数据里的 mediaKinds 同 mediaTypes */
export function scopeText(scope: RuleGroupScope): string {
  const s = scope as RuleGroupScope & { mediaKinds?: string[] };
  const parts: string[] = [];
  const kinds = s.mediaTypes ?? s.mediaKinds;
  if (kinds?.length) parts.push(kinds.map((k) => MEDIA_KIND[k as keyof typeof MEDIA_KIND] ?? k).join("、"));
  if (s.entityIds?.length) parts.push(`${s.entityIds.length} 个作品`);
  if (s.siteIds?.length) parts.push(`${s.siteIds.length} 个站点`);
  if (s.subscriptionId) parts.push("订阅私有");
  return parts.length ? parts.join(" · ") : "全部";
}

/** 单条规则(偏好标签形态):不在默认链、不是订阅私有,层 + 硬排除合计一条;旧偏好标签迁来的都算 */
export function isTagLike(g: RuleGroup): boolean {
  if (g.defaultOrder !== null || g.scope.subscriptionId) return false;
  if (g.legacyKind) return true;
  return g.layers.length + g.hardExcludes.length === 1;
}

/** 标签上的一句规则摘要 */
export function ruleSummary(g: RuleGroup): string {
  const parts: string[] = [];
  if (g.layers.length)
    parts.push(`${g.ladderRequired ? "要求" : "偏好"} ${g.layers.map((l) => exprToString(l.expr)).join(" > ")}`);
  for (const h of g.hardExcludes) parts.push(`排除 ${exprToString(h)}`);
  if (parts.length) return parts.join(";");
  return g.legacyKind ? "旧偏好标签，没有可评估的条件" : "没有条件";
}