const DEFAULT_LOCALE = "zh-CN";

const REGION_LABELS = {
  americas: "美洲",
  europe: "欧洲",
  "middle-east-africa": "中东与非洲",
  "asia-pacific": "亚太",
  global: "全球",
};

const FEED_LABELS = {
  "Global Monitor / World": "区域监测",
  "Global Monitor / Americas": "区域监测",
  "Global Monitor / Europe": "区域监测",
  "Global Monitor / MEA": "区域监测",
  "Global Monitor / APAC": "区域监测",
};

const CATEGORY_LABELS = {
  politics: "政治",
  business: "商业",
  ecommerce: "电商",
  finance: "金融",
  sports: "体育",
  technology: "科技",
  military: "军事",
  disaster: "灾害",
  energy: "能源",
  society: "社会",
  culture: "文化",
  other: "其他",
};

const BREAKING_LEVEL_LABELS = {
  watch: "关注",
  breaking: "突发",
  critical: "严重突发",
};

const BREAKING_SCOPE_LABELS = {
  regional: "区域",
  global: "全球",
};

const SOURCE_TYPE_LABELS = {
  rss: "RSS",
  atom: "Atom",
  aggregated: "Aggregated",
  manual: "手动添加",
  reference: "Reference",
};

const LOCATION_SOURCE_LABELS = {
  region_anchor: "区域锚点",
  ai_inferred_target: "AI 推断位置",
  headline_location_hint: "标题位置线索",
  headline_country_hint: "标题国家线索",
};

const ENRICHMENT_STATUS_LABELS = {
  pending: "待增强",
  queued: "增强排队中",
  attempted: "增强中",
  success: "已汉化",
  content_only: "已汉化",
  location_only: "位置已增强",
  unavailable: "AI 未配置",
  provider_error: "增强失败",
  parse_error: "增强解析失败",
  no_result: "暂无增强结果",
};

const TITLE_PLACEHOLDERS = {
  queued: "新闻汉化排队中",
  attempted: "新闻汉化中",
  provider_error: "新闻汉化失败，正在重试",
  parse_error: "新闻解析失败，正在重试",
  unavailable: "等待 AI 配置",
  no_result: "新闻汉化待重试",
  location_only: "新闻汉化待重试",
};

const SUMMARY_PLACEHOLDERS = {
  queued: "中文概要正在生成，请稍后刷新。",
  attempted: "中文概要正在生成，请稍后刷新。",
  provider_error: "中文概要生成失败，系统会重新提交增强任务。",
  parse_error: "中文概要解析失败，系统会重新提交增强任务。",
  unavailable: "AI 服务配置完成后将生成中文概要。",
  no_result: "中文概要暂未生成，系统会继续重试。",
  location_only: "已完成位置增强，中文概要将继续重试。",
};

function normalizeText(value) {
  return String(value ?? "").replace(/\s+/g, " ").trim();
}

function getLocalization(item, locale = DEFAULT_LOCALE) {
  const localizations = item?.localizations;
  const localized = localizations && typeof localizations === "object"
    ? localizations[locale]
    : null;
  return localized && typeof localized === "object" ? localized : {};
}

export function getNewsDisplayTitle(item, locale = DEFAULT_LOCALE) {
  const localized = getLocalization(item, locale).title;
  if (localized || item?.display_title) {
    return normalizeText(item?.display_title || localized);
  }
  if (item?.title) {
    return normalizeText(item.title);
  }
  return normalizeText(
    TITLE_PLACEHOLDERS[item?.enrichment_status]
      || "新闻汉化中",
  );
}

export function getNewsDisplaySummary(item, locale = DEFAULT_LOCALE) {
  const localized = getLocalization(item, locale).summary;
  if (localized || item?.display_summary) {
    return normalizeText(item?.display_summary || localized);
  }
  if (item?.summary) {
    return normalizeText(item.summary);
  }
  return normalizeText(
    SUMMARY_PLACEHOLDERS[item?.enrichment_status]
      || "中文概要生成中，请稍后刷新。",
  );
}

export function isNewsContentReady(item, locale = DEFAULT_LOCALE) {
  const localized = getLocalization(item, locale);
  const title = normalizeText(item?.display_title || localized.title || item?.title);
  const summary = normalizeText(item?.display_summary || localized.summary || item?.summary);
  return Boolean(title && summary);
}

export function getNewsRegionLabel(region, fallback = "") {
  return REGION_LABELS[region] || fallback || region || REGION_LABELS.global;
}

export function getNewsFeedLabel(feedName) {
  return FEED_LABELS[feedName] || feedName || "聚合源";
}

export function getNewsCategoryLabel(category) {
  return CATEGORY_LABELS[category] || category || CATEGORY_LABELS.other;
}

export function getNewsBreakingLabel(level, scope = "regional") {
  const normalizedLevel = normalizeText(level).toLowerCase();
  if (!normalizedLevel || normalizedLevel === "none") return "";
  const levelLabel = BREAKING_LEVEL_LABELS[normalizedLevel] || level;
  const scopeLabel = BREAKING_SCOPE_LABELS[normalizeText(scope).toLowerCase()] || BREAKING_SCOPE_LABELS.regional;
  return `${scopeLabel}${levelLabel}`;
}

export function getNewsSourceTypeLabel(sourceType) {
  const normalized = normalizeText(sourceType).toLowerCase();
  return SOURCE_TYPE_LABELS[normalized] || sourceType || "RSS";
}

export function isRegionalMonitorFeed(feedName) {
  return Object.prototype.hasOwnProperty.call(FEED_LABELS, feedName);
}

export function getNewsFetchChannelLabel(feedName, sourceType = "") {
  const normalized = normalizeText(sourceType).toLowerCase();
  if (isRegionalMonitorFeed(feedName) || normalized === "aggregated") return "区域监测";
  if (normalized === "manual") return "手动添加";
  if (normalized === "atom") return "单源 Atom";
  if (normalized === "reference") return "配置保留";
  return "单源 RSS";
}

export function getNewsLocationSourceLabel(source) {
  return LOCATION_SOURCE_LABELS[source] || source || "位置来源";
}

export function getNewsEnrichmentStatusLabel(statusOrItem) {
  const item = statusOrItem && typeof statusOrItem === "object" ? statusOrItem : null;
  const status = item ? item.enrichment_status : statusOrItem;
  const language = String(item?.content_language || "").toLowerCase();
  if (language.startsWith("zh") && status !== "success" && status !== "content_only") {
    if (status === "queued" || status === "attempted") return "英文补译中";
    if (status === "provider_error" || status === "parse_error" || status === "no_result") return "中文原文";
    return "中文原文";
  }
  return ENRICHMENT_STATUS_LABELS[status] || status || "增强状态";
}