const dimensionMeta = require("../constants/dimensions");
const { formatDisplayDateTime } = require("./date");

const dimensionMap = dimensionMeta.reduce((acc, item) => {
  acc[item.key] = item;
  return acc;
}, {});

function pickValue(source, keys, fallback) {
  if (!source) {
    return fallback;
  }
  for (const key of keys) {
    if (Object.prototype.hasOwnProperty.call(source, key)) {
      const value = source[key];
      if (value !== undefined && value !== null) {
        return value;
      }
    }
  }
  return fallback;
}

function mapTrendText(trend) {
  if (trend === "up") {
    return "回升";
  }
  if (trend === "down") {
    return "波动";
  }
  return "平稳";
}

function normalizePillars(pillars) {
  if (!Array.isArray(pillars)) {
    return [];
  }
  return pillars
    .map((item) => ({
      label: pickValue(item, ["label", "Label"], ""),
      value: pickValue(item, ["value", "Value"], "")
    }))
    .filter((item) => item.label || item.value);
}

function formatListText(list, separator = " · ") {
  if (!Array.isArray(list) || !list.length) {
    return "";
  }
  return list.join(separator);
}

function normalizeFortunePayload(fortune) {
  if (!fortune) {
    return null;
  }
  const dimensionListRaw = pickValue(fortune, ["dimensions", "Dimensions"], []);
  const dimensionList = Array.isArray(dimensionListRaw) ? dimensionListRaw : [];
  const dimensions = dimensionList.map((item) => {
    const key = pickValue(item, ["key", "Key"], "");
    const meta = dimensionMap[key] || {};
    const trend = pickValue(item, ["trend", "Trend"], "steady");
    return {
      key,
      title: pickValue(item, ["title", "Title"], meta.title || key),
      score: pickValue(item, ["score", "Score"], 0),
      trend,
      insight: pickValue(item, ["insight", "Insight"], ""),
      suggestion: pickValue(item, ["suggestion", "Suggestion"], ""),
      icon: meta.icon || "⭐",
      accent: meta.accent || "#ffb85c",
      trendText: mapTrendText(trend)
    };
  });
  const total = dimensions.reduce((acc, current) => acc + (current.score || 0), 0);
  const overallScore = dimensions.length ? Math.round(total / dimensions.length) : 0;

  return {
    fortuneDate: pickValue(fortune, ["fortuneDate", "FortuneDate"], ""),
    summary: pickValue(fortune, ["summary", "Summary"], ""),
    narrative: pickValue(fortune, ["narrative", "Narrative"], ""),
    dimensions,
    overallScore,
    luckyGuide: normalizeGuide(pickValue(fortune, ["luckyGuide", "LuckyGuide"], null)),
    profile: normalizeProfile(pickValue(fortune, ["profile", "Profile"], null))
  };
}

function normalizeProfile(profile) {
  if (!profile) {
    return null;
  }
  const fiveElements = pickValue(profile, ["fiveElementDistribution", "FiveElementDistribution"], []);
  const total = fiveElements.reduce((acc, item) => acc + (pickValue(item, ["count", "Count"], 0) || 0), 0) || 1;
  const distribution = fiveElements.map((item) => {
    const count = pickValue(item, ["count", "Count"], 0);
    const percent = Math.round(((count || 0) / total) * 100);
    return {
      element: pickValue(item, ["element", "Element"], "未知"),
      count,
      percent,
      width: `${Math.max(percent, 6)}%`
    };
  });
  const birthDateTimeRaw = pickValue(profile, ["birthDateTime", "BirthDateTime"], "");
  return {
    birthCity: pickValue(profile, ["birthCity", "BirthCity"], ""),
    birthProvince: pickValue(profile, ["birthProvince", "BirthProvince"], ""),
    birthDateTime: birthDateTimeRaw ? formatDisplayDateTime(birthDateTimeRaw) : "",
    birthPillars: normalizePillars(pickValue(profile, ["birthPillars", "BirthPillars"], [])),
    todayPillars: normalizePillars(pickValue(profile, ["todayPillars", "TodayPillars"], [])),
    distribution,
    weakElements: pickValue(profile, ["weakElements", "WeakElements"], []),
    strongElements: pickValue(profile, ["strongElements", "StrongElements"], [])
  };
}

function normalizeGuide(guide) {
  if (!guide) {
    return null;
  }
  const slots = pickValue(guide, ["bestTimeSlots", "BestTimeSlots"], []);
  const colors = pickValue(guide, ["colors", "Colors"], []);
  const directions = pickValue(guide, ["directions", "Directions"], []);
  const props = pickValue(guide, ["props", "Props"], []);
  const activities = pickValue(guide, ["activities", "Activities"], []);
  return {
    element: pickValue(guide, ["element", "Element"], "木"),
    colors,
    colorText: formatListText(colors),
    directions,
    directionText: formatListText(directions),
    props,
    propsText: formatListText(props),
    activities,
    activitiesText: formatListText(activities, " / "),
    bestTimeSlots: Array.isArray(slots)
      ? slots.map((slot) => ({
          label: pickValue(slot, ["label", "Label"], "时段"),
          period: pickValue(slot, ["period", "Period"], ""),
          reason: pickValue(slot, ["reason", "Reason"], "")
        }))
      : []
  };
}

module.exports = {
  normalizeFortunePayload
};