import { z } from "zod";

export type DailyStarlanguageCard = {
  readonly trend: string;
  readonly action: string;
  readonly caution: string;
};

export type DailyStarlanguageEvidence = {
  readonly today: string;
  readonly birthTimeVerified: boolean;
  readonly ascendantSign: string | null;
  readonly moonSign: string | null;
  readonly transitMoonSign: string | null;
  readonly transitMoonHouse: number | null;
  readonly vimshottari: {
    readonly mahadasha: string | null;
    readonly antardasha: string | null;
    readonly remainingDays: number | null;
    readonly nakshatra: string | null;
  } | null;
  readonly narayanaSign: string | null;
  readonly divisional: readonly {
    readonly chart: string;
    readonly ascendantSign: string | null;
    readonly moonSign: string | null;
  }[];
  readonly transit: {
    readonly totalTriggers: number;
    readonly top: readonly string[];
  } | null;
  readonly functionalBenefics: readonly string[];
  readonly functionalMalefics: readonly string[];
  readonly missingLayers: readonly string[];
};

export type DailyStarlanguageEngineLayers = {
  readonly chart: unknown;
  readonly vimshottari: unknown;
  readonly narayana: unknown;
  readonly varga: unknown;
  readonly transit: unknown;
};

const cardSchema = z.object({
  trend: z.string().transform(normalizeLine).pipe(z.string().min(8).max(90)),
  action: z.string().transform(normalizeLine).pipe(z.string().min(4).max(90)),
  caution: z.string().transform(normalizeLine).pipe(z.string().min(4).max(90)),
});

function normalizeLine(value: string): string {
  return value.replace(/\s+/g, " ").trim().slice(0, 90);
}

function asRecord(value: unknown): Record<string, unknown> | null {
  return value && typeof value === "object" && !Array.isArray(value) ? value as Record<string, unknown> : null;
}

function asArray(value: unknown): readonly unknown[] {
  return Array.isArray(value) ? value : [];
}

function asText(value: unknown): string | null {
  return typeof value === "string" && value.trim() ? value.trim().slice(0, 60) : null;
}

function asCount(value: unknown): number | null {
  return typeof value === "number" && Number.isFinite(value) ? value : null;
}

function at(value: unknown, ...path: readonly string[]): unknown {
  return path.reduce<unknown>((current, key) => asRecord(current)?.[key], value);
}

function chartModule(chart: unknown): unknown {
  return at(chart, "modules", "chart") ?? chart;
}

function signOf(value: unknown): string | null {
  return asText(asRecord(value)?.sign);
}

function planetSign(container: unknown, planet: string): string | null {
  return signOf(at(container, "planets", planet));
}

function vimshottariLayer(response: unknown): DailyStarlanguageEvidence["vimshottari"] {
  const current = at(response, "vimshottari_analysis", "current");
  if (!asRecord(current)) return null;
  return {
    mahadasha: asText(at(current, "mahadasha", "lord")),
    antardasha: asText(at(current, "antardasha", "lord")),
    remainingDays: asCount(asRecord(current)?.remaining_days),
    nakshatra: asText(at(response, "vimshottari_analysis", "nakshatra", "name")),
  };
}

function narayanaSign(response: unknown, today: string): string | null {
  const periods = asArray(asRecord(response)?.periods);
  const running = periods.find((period) => {
    const start = asText(asRecord(period)?.start);
    const end = asText(asRecord(period)?.end);
    return Boolean(start && end && start <= today && today <= end);
  });
  return asText(asRecord(running ?? periods[0])?.lord);
}

function divisionalLayer(response: unknown): DailyStarlanguageEvidence["divisional"] {
  const result = asRecord(asRecord(response)?.result);
  if (!result) return [];
  return Object.entries(result)
    .slice(0, 4)
    .map(([chart, value]) => ({
      chart,
      ascendantSign: signOf(asRecord(value)?.ascendant),
      moonSign: planetSign(value, "Moon"),
    }))
    .filter((entry) => entry.ascendantSign || entry.moonSign);
}

function transitLayer(response: unknown): DailyStarlanguageEvidence["transit"] {
  const summary = asRecord(asRecord(response)?.summary);
  if (!summary) return null;
  const top = asArray(summary.top_triggers)
    .slice(0, 3)
    .map((trigger) => {
      const planet = asText(asRecord(trigger)?.planet);
      const target = asText(asRecord(trigger)?.target);
      const event = asText(asRecord(trigger)?.event);
      return [planet, target, event].filter(Boolean).join(" → ");
    })
    .filter((line) => line.length > 0);
  return { totalTriggers: asCount(summary.total_triggers) ?? 0, top };
}

function functionalPlanets(chart: unknown, key: "functional_benefics" | "functional_malefics"): readonly string[] {
  const snapshot = asRecord(at(chart, "ai_prompt_pack", "evidence_snapshot", "functional_benefic_malefic"));
  if (!snapshot || snapshot.status !== "used") return [];
  return asArray(snapshot[key])
    .map((planet) => asText(planet))
    .filter((planet): planet is string => Boolean(planet))
    .slice(0, 5);
}

export function dailyStarlanguageEvidence(
  layers: DailyStarlanguageEngineLayers,
  today: string,
  birthTimeVerified: boolean,
): DailyStarlanguageEvidence {
  const chart = chartModule(layers.chart);
  const vimshottari = vimshottariLayer(layers.vimshottari);
  const divisional = divisionalLayer(layers.varga);
  const transit = transitLayer(layers.transit);
  const narayana = narayanaSign(layers.narayana, today);
  const missingLayers = [
    vimshottari ? "" : "Vimshottari",
    narayana ? "" : "Narayana",
    divisional.length ? "" : "分盘",
    transit ? "" : "过境",
  ].filter((layer) => layer.length > 0);
  return {
    today,
    birthTimeVerified,
    ascendantSign: signOf(asRecord(chart)?.ascendant),
    moonSign: planetSign(chart, "Moon"),
    transitMoonSign: null,
    transitMoonHouse: null,
    vimshottari,
    narayanaSign: narayana,
    divisional,
    transit,
    functionalBenefics: functionalPlanets(layers.chart, "functional_benefics"),
    functionalMalefics: functionalPlanets(layers.chart, "functional_malefics"),
    missingLayers,
  };
}

export function evidenceFromDailyGuidance(
  packet: Record<string, unknown>,
  today: string,
  birthTimeVerified: boolean,
): DailyStarlanguageEvidence | null {
  if (packet.success !== true) return null;
  const moonHouse = asCount(packet.moon_house);
  const transitMoonHouse = moonHouse !== null && moonHouse >= 1 && moonHouse <= 12 ? moonHouse : null;
  const mahadasha = asText(packet.mahadasha_lord);
  const transitMoonSign = asText(packet.moon_sign);
  if (!transitMoonHouse && !mahadasha && !transitMoonSign) return null;
  return {
    today: asText(packet.date) ?? today,
    birthTimeVerified,
    ascendantSign: asText(packet.ascendant_sign),
    moonSign: asText(packet.natal_moon_sign),
    transitMoonSign,
    transitMoonHouse,
    vimshottari: mahadasha
      ? { mahadasha, antardasha: null, remainingDays: null, nakshatra: null }
      : null,
    narayanaSign: null,
    divisional: [],
    transit: transitMoonSign
      ? { totalTriggers: transitMoonHouse ? 1 : 0, top: [`Moon → ${transitMoonSign}`] }
      : null,
    functionalBenefics: [],
    functionalMalefics: [],
    missingLayers: [
      mahadasha ? "" : "Vimshottari",
      "Narayana",
      "分盘",
    ].filter((layer) => layer.length > 0),
  };
}

export function dailyStarlanguagePrompt(evidence: DailyStarlanguageEvidence): string {
  return [
    `今天的日期：${evidence.today}`,
    evidence.birthTimeVerified
      ? "出生时间状态：已确认。"
      : "出生时间状态：未经校正确认，禁止任何依赖分钟精度的判断。",
    JSON.stringify(evidence),
    "只依据上面这份证据写今天的星语。缺失的层不要假装存在，也不要提到证据缺失本身。",
  ].join("\n");
}

export function parseDailyStarlanguageText(text: string): DailyStarlanguageCard | null {
  const normalized = text.trim().replace(/^```(?:json)?\s*/i, "").replace(/\s*```$/, "");
  const start = normalized.indexOf("{");
  const end = normalized.lastIndexOf("}");
  if (start < 0 || end <= start) return null;
  let payload: unknown;
  try {
    payload = JSON.parse(normalized.slice(start, end + 1));
  } catch {
    return null;
  }
  const parsed = cardSchema.safeParse(payload);
  return parsed.success ? parsed.data : null;
}

export function dailyStarlanguageCacheKey(userId: string, profileFingerprint: string, today: string): string {
  return JSON.stringify([userId, profileFingerprint, today]);
}

export function dailyStarlanguageProfileKey(profile: {
  readonly date?: string;
  readonly time?: string;
  readonly timezoneId?: string;
  readonly latitude?: number | null;
  readonly longitude?: number | null;
  readonly timezoneOffset?: number | null;
  readonly birthTimeStatus?: string;
}): string {
  return JSON.stringify([
    profile.date ?? "",
    profile.time ?? "",
    profile.timezoneId ?? "",
    profile.latitude ?? null,
    profile.longitude ?? null,
    profile.timezoneOffset ?? null,
    profile.birthTimeStatus ?? "",
  ]);
}

export function calendarDateInTimeZone(now: Date, timeZone?: string | null): string {
  const utc = now.toISOString().slice(0, 10);
  const zone = timeZone?.trim();
  if (!zone) return utc;
  try {
    const parts = new Intl.DateTimeFormat("en-CA", {
      timeZone: zone,
      year: "numeric",
      month: "2-digit",
      day: "2-digit",
    }).formatToParts(now);
    const year = parts.find((part) => part.type === "year")?.value;
    const month = parts.find((part) => part.type === "month")?.value;
    const day = parts.find((part) => part.type === "day")?.value;
    return year && month && day ? `${year}-${month}-${day}` : utc;
  } catch {
    return utc;
  }
}

const SIGNS = [
  "Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo",
  "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces",
] as const;

const PLANET_ZH: Record<string, string> = {
  Sun: "太阳",
  Moon: "月亮",
  Mars: "火星",
  Mercury: "水星",
  Jupiter: "木星",
  Venus: "金星",
  Saturn: "土星",
  Rahu: "罗睺",
  Ketu: "计都",
};

const HOUSE_THEMES: Record<number, { readonly theme: string; readonly action: string }> = {
  1: { theme: "自我", action: "整理状态，把节奏重新起起来。" },
  2: { theme: "财务", action: "核对一笔开支或定价，给资源设上限。" },
  3: { theme: "沟通", action: "把一条卡住的消息写成可以直接发出去的版本。" },
  4: { theme: "家庭", action: "处理一件家宅事务，或把一个角落收拾完。" },
  5: { theme: "表达", action: "完成一小段创作或一次轻松的联系。" },
  6: { theme: "执行", action: "从清单里勾掉一件能今天做完的事。" },
  7: { theme: "合作", action: "主动联系一个人，把合作里未说清的一句补上。" },
  8: { theme: "复盘", action: "清理一个旧问题，只推进到可复查的一步。" },
  9: { theme: "学习", action: "记下一个观点，或把远程联络发出去。" },
  10: { theme: "事业", action: "把一件成果推进一步，让别人看得见。" },
  11: { theme: "人脉", action: "在一个群或一次交流里，完成一次具体的交换。" },
  12: { theme: "休整", action: "先收尾一件未完成的事，再给自己留一段安静。" },
};

function planetZh(name: string | null): string | null {
  return name ? PLANET_ZH[name] ?? null : null;
}

function moonHouse(evidence: DailyStarlanguageEvidence): number | null {
  if (!evidence.birthTimeVerified) return null;
  if (evidence.transitMoonHouse) return evidence.transitMoonHouse;
  const asc = evidence.ascendantSign;
  const moon = evidence.transitMoonSign ?? evidence.moonSign;
  if (!asc || !moon) return null;
  const ascIndex = SIGNS.indexOf(asc as typeof SIGNS[number]);
  const moonIndex = SIGNS.indexOf(moon as typeof SIGNS[number]);
  if (ascIndex < 0 || moonIndex < 0) return null;
  return (moonIndex - ascIndex + 12) % 12 + 1;
}

export function composeDailyStarlanguageCard(evidence: DailyStarlanguageEvidence): DailyStarlanguageCard {
  const house = moonHouse(evidence);
  const theme = house ? HOUSE_THEMES[house] : undefined;
  const mahadasha = planetZh(evidence.vimshottari?.mahadasha ?? null);
  const hasTransitWindow = Boolean(evidence.transitMoonSign || (evidence.transit?.totalTriggers ?? 0) > 0);
  const trend = theme && mahadasha
    ? `今天${theme.theme}的节奏更明显，${mahadasha}大运里适合先把一件小事做完。`
    : theme
      ? `今天${theme.theme}的节奏更明显，适合把计划压到一件能完成的事。`
      : mahadasha
        ? `今天按${mahadasha}大运的节奏推进，先把一件主事做小、做完。`
        : hasTransitWindow
          ? "今天月亮换了观察窗口，先按你当前节奏推进一件主事。"
          : "今天按你本命的节奏稳步推进，把计划压到一件主事。";
  const action = theme?.action ?? "把今天要做的事收成一件，做完再看下一件。";
  const caution = evidence.birthTimeVerified
    ? (hasTransitWindow
      ? "这是今天的观察窗口，先别把它当成今天就会发生的结果。"
      : "大运描述的是阶段质地，不是今天的结果。")
    : "出生时间尚未确认，这里只看大方向，不依赖具体分钟。";
  return {
    trend: normalizeLine(trend),
    action: normalizeLine(action),
    caution: normalizeLine(caution),
  };
}

export const dailyStarlanguageCardSchema = z.object({
  trend: z.string().min(8).max(90),
  action: z.string().min(4).max(90),
  caution: z.string().min(4).max(90),
});