import {
  toNorthIndianChart,
  type ReportChartBlock,
} from "./report-chart-block.ts";
import {
  ANTARDASHA_DERIVED_NOTE,
  CHARA_ANTARDASHA_DATE_NOTE,
  CHART_VIEW_COPY,
  COORDINATE_BOUNDARY,
  DASHA_DUAL_TRACK_NOTE,
  PLANET_ORDER,
  SIGN_ORDER,
  VARGA_CHIP_ORDER,
  VIMSHOTTARI_ORDER,
  VIMSHOTTARI_YEARS,
  WESTERN_UNAVAILABLE_COPY,
  ASPECT_ZH,
  ELEMENT_ZH,
  MODE_ZH,
  WESTERN_BODY_ZH,
  isSignName,
  planetZh,
  signZh,
} from "./chart-view-labels.ts";
import { traditionalSymbol } from "./chart-view-symbols.ts";
import { vargaDignity } from "./chart-view-varga.ts";
import { transitsFromEngine } from "./ephemeris-view.ts";
import { TRANSIT_LOCAL_TIME } from "./transit-chart-body.ts";
import {
  chartViewOkSchema,
  type ChartViewBhavaOk,
  type ChartViewMoonChart,
  type ChartViewOk,
  type ChartViewTransitOk,
  type ChartViewUnavailableLayer,
  type ChartViewVarga,
  type ChartViewVargaAscendantRow,
  type ChartViewVargaRow,
  type ChartViewWesternOk,
  type NorthIndianChart,
} from "./chart-view-contract.ts";

export type ChartViewProfileInput = {
  name?: string;
  date: string;
  time: string;
  placeLabel?: string;
  latitude: number;
  longitude: number;
  timezoneOffset: number;
  timezoneId?: string;
  ayanamsa?: string;
  birthTimeStatus?: string;
};

export type ChartViewEngineBundle = {
  chart: Record<string, unknown>;
  varga: Record<string, unknown> | null;
  chara: Record<string, unknown> | null;
  western: Record<string, unknown> | null;
  bhava?: Record<string, unknown> | null;
  transit?: Record<string, unknown> | null;
  profile: ChartViewProfileInput;
  asOf: string;
};

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

function text(value: unknown): string | null {
  return typeof value === "string" && value.trim() ? value.trim() : null;
}

function finite(value: unknown): number | null {
  if (typeof value === "number" && Number.isFinite(value)) return value;
  if (typeof value === "string" && value.trim()) {
    const parsed = Number(value);
    return Number.isFinite(parsed) ? parsed : null;
  }
  return null;
}

function isoDay(value: string): string {
  return value.slice(0, 10);
}

function addWeightedSpan(startIso: string, endIso: string, index: number, weights: readonly number[]): { start: string; end: string } {
  const start = Date.parse(`${startIso}T00:00:00Z`);
  const end = Date.parse(`${endIso}T00:00:00Z`);
  const total = weights.reduce((sum, weight) => sum + (Number.isFinite(weight) ? weight : 0), 0);
  // A zero-year Chara mahadasha gives every antardasha weight 0. `??` does not
  // replace 0, so total is 0 and `before / total` is NaN. Never call
  // `Date#toISOString` on that — it throws RangeError and fails the whole chart.
  if (!Number.isFinite(start) || !Number.isFinite(end) || !(total > 0)) {
    return { start: startIso, end: startIso };
  }
  const before = weights.slice(0, index).reduce((sum, weight) => sum + (Number.isFinite(weight) ? weight : 0), 0);
  const weight = Number.isFinite(weights[index]) ? weights[index]! : 0;
  const span = end - start;
  const from = start + span * (before / total);
  const to = index === weights.length - 1 ? end : start + span * ((before + weight) / total);
  if (!Number.isFinite(from) || !Number.isFinite(to)) return { start: startIso, end: startIso };
  return { start: new Date(from).toISOString().slice(0, 10), end: new Date(to).toISOString().slice(0, 10) };
}

function addYears(startIso: string, years: number): string {
  const start = Date.parse(`${startIso}T00:00:00Z`);
  return new Date(start + years * 365.25 * 86_400_000).toISOString().slice(0, 10);
}

function containsDay(start: string, end: string, asOf: string): boolean {
  return start <= asOf && asOf < end;
}

function asPlanetMap(value: unknown): Record<string, Record<string, unknown>> {
  const raw = record(value);
  if (!raw) return {};
  const out: Record<string, Record<string, unknown>> = {};
  for (const [name, planet] of Object.entries(raw)) {
    const row = record(planet);
    if (row) out[name] = row;
  }
  return out;
}

function planetLon(planet: Record<string, unknown>): number | null {
  return finite(planet.lon) ?? finite(planet.longitude) ?? finite(planet.degree_raw);
}

function planetDegreeInSign(planet: Record<string, unknown>): number {
  return finite(planet.degree_in_sign) ?? finite(planet.degree) ?? ((planetLon(planet) ?? 0) % 30);
}

function statusLabel(planet: Record<string, unknown>): string {
  const retrograde = Boolean(planet.retrograde);
  const dignity = text(planet.status) ?? "中性";
  return retrograde && !dignity.includes("逆") ? `${dignity} · 逆行` : dignity;
}

function birthTimeStatusLabel(status: string): string {
  if (status === "confirmed") return "已校正";
  if (status === "accepted") return "已采用";
  return "填报时间";
}

function nodeModeLabel(mode: "mean" | "true"): string {
  return mode === "true" ? "真交点" : "平交点";
}

function formatCoord(latitude: number, longitude: number): string {
  const ns = latitude >= 0 ? "N" : "S";
  const ew = longitude >= 0 ? "E" : "W";
  return `${Math.abs(latitude).toFixed(2)}°${ns} ${Math.abs(longitude).toFixed(2)}°${ew}`;
}

function houseFromPlanet(planet: Record<string, unknown>, ascSign: string): number {
  const direct = finite(planet.house);
  if (direct !== null && direct >= 1 && direct <= 12) return Math.trunc(direct);
  const sign = text(planet.sign);
  if (!sign || !isSignName(sign) || !isSignName(ascSign)) return 1;
  return ((SIGN_ORDER.indexOf(sign) - SIGN_ORDER.indexOf(ascSign) + 12) % 12) + 1;
}

function natalBlock(chart: Record<string, unknown>): ReportChartBlock | null {
  const planets = asPlanetMap(chart.planets);
  const ascendant = record(chart.ascendant);
  const ascSign = text(ascendant?.sign);
  if (!ascSign || !isSignName(ascSign)) return null;
  const rows: ReportChartBlock["planets"] = [];
  for (const name of PLANET_ORDER) {
    const planet = planets[name];
    if (!planet) continue;
    const sign = text(planet.sign);
    if (!sign || !isSignName(sign)) continue;
    rows.push({
      name,
      sign,
      degree: Math.min(29.999, Math.max(0, planetDegreeInSign(planet))),
      retrograde: Boolean(planet.retrograde),
    });
  }
  if (rows.length === 0) return null;
  return {
    version: 1,
    id: "D1",
    title: "D1 — 本命盘",
    layout: "north",
    ascendant: {
      sign: ascSign,
      degree: Math.min(29.999, Math.max(0, finite(ascendant?.degree_in_sign) ?? finite(ascendant?.degree) ?? 0)),
    },
    planets: rows,
  };
}

function vargaKey(division: number, result: Record<string, unknown>): Record<string, unknown> | null {
  const exact = Object.entries(result).find(([key]) => key === `D${division}` || key.startsWith(`D${division}_`));
  return exact ? record(exact[1]) : null;
}

type NatalSigns = { planets: ReadonlyMap<string, string>; ascendant: string | null };

function houseFromSigns(sign: string, ascSign: string): number {
  return ((SIGN_ORDER.indexOf(sign as (typeof SIGN_ORDER)[number]) - SIGN_ORDER.indexOf(ascSign as (typeof SIGN_ORDER)[number]) + 12) % 12) + 1;
}

/**
 * The divisional chart's own rows: the engine's divisional sign, in-varga
 * degree and house (counted from the divisional ascendant), plus the D1 sign
 * each body came from. Nothing is recomputed here except the sign-dignity
 * lookup, whose tables are the engine's (`chart-view-varga.ts`).
 */
function vargaRows(
  ascSign: string,
  varga: Record<string, unknown>,
  natalRetro: ReadonlyMap<string, boolean>,
  natal: NatalSigns,
): { ascendant: ChartViewVargaAscendantRow | undefined; rows: ChartViewVargaRow[] } {
  const planets = asPlanetMap(varga.planets);
  const rows: ChartViewVargaRow[] = [];
  for (const name of PLANET_ORDER) {
    const planet = planets[name];
    const sign = text(planet?.sign);
    const natalSign = natal.planets.get(name);
    if (!planet || !sign || !isSignName(sign) || !natalSign) continue;
    const engineHouse = finite(planet.house);
    rows.push({
      name,
      label: planetZh(name),
      sign,
      signLabel: signZh(sign),
      degreeInSign: Math.min(29.9999, Math.max(0, planetDegreeInSign(planet))),
      house: engineHouse !== null && engineHouse >= 1 && engineHouse <= 12 ? Math.trunc(engineHouse) : houseFromSigns(sign, ascSign),
      natalSign,
      natalSignLabel: signZh(natalSign),
      dignity: vargaDignity(name, sign),
      vargottama: sign === natalSign,
      retrograde: natalRetro.get(name) ?? false,
    });
  }
  const ascendant = record(varga.ascendant);
  const ascendantRow = natal.ascendant ? {
    sign: ascSign,
    signLabel: signZh(ascSign),
    degreeInSign: Math.min(29.9999, Math.max(0, finite(ascendant?.degree) ?? 0)),
    natalSign: natal.ascendant,
    natalSignLabel: signZh(natal.ascendant),
    vargottama: ascSign === natal.ascendant,
  } : undefined;
  return { ascendant: ascendantRow, rows };
}

function vargaToChart(
  id: string,
  title: string,
  varga: Record<string, unknown>,
  natalRetro: ReadonlyMap<string, boolean>,
): { chart: NorthIndianChart; meaning: string; division: number } | null {
  const ascendant = record(varga.ascendant);
  const ascSign = text(ascendant?.sign);
  if (!ascSign || !isSignName(ascSign)) return null;
  const planets = asPlanetMap(varga.planets);
  const rows: ReportChartBlock["planets"] = [];
  for (const name of PLANET_ORDER) {
    const planet = planets[name];
    if (!planet) continue;
    const sign = text(planet.sign);
    if (!sign || !isSignName(sign)) continue;
    rows.push({
      name,
      sign,
      degree: Math.min(29.999, Math.max(0, planetDegreeInSign(planet))),
      retrograde: natalRetro.get(name) ?? false,
    });
  }
  const division = finite(varga.division) ?? Number(id.slice(1));
  const meaning = text(varga.meaning) ?? title;
  const block: ReportChartBlock = {
    version: 1,
    id: id as ReportChartBlock["id"],
    title,
    layout: "north",
    ascendant: {
      sign: ascSign,
      degree: Math.min(29.999, Math.max(0, finite(ascendant?.degree) ?? 0)),
    },
    planets: rows,
  };
  return { chart: toNorthIndianChart(block), meaning, division };
}

function buildVargas(
  chart: Record<string, unknown>,
  vargaPacket: Record<string, unknown> | null,
): ChartViewVarga[] {
  const natalRetro = new Map<string, boolean>();
  const natalPlanetSigns = new Map<string, string>();
  for (const [name, planet] of Object.entries(asPlanetMap(chart.planets))) {
    natalRetro.set(name, Boolean(planet.retrograde));
    const sign = text(planet.sign);
    if (sign && isSignName(sign)) natalPlanetSigns.set(name, sign);
  }
  const natalAsc = text(record(chart.ascendant)?.sign);
  const natal: NatalSigns = { planets: natalPlanetSigns, ascendant: natalAsc && isSignName(natalAsc) ? natalAsc : null };
  const result = record(vargaPacket?.result) ?? {};
  const vargas: ChartViewVarga[] = [];
  for (const division of VARGA_CHIP_ORDER) {
    const raw = vargaKey(division, result);
    const id = `D${division}`;
    if (raw) {
      const mapped = vargaToChart(id, `${id} ${text(raw.name) ?? ""}`.trim(), raw, natalRetro);
      if (mapped) {
        const ascSign = text(record(raw.ascendant)?.sign)!;
        vargas.push({
          id,
          title: id,
          meaning: mapped.meaning,
          division: mapped.division,
          chart: mapped.chart,
          ...(division === 1 ? {} : vargaRows(ascSign, raw, natalRetro, natal)),
        });
        continue;
      }
    }
    if (division === 1) {
      const block = natalBlock(chart);
      if (block) {
        vargas.push({
          id: "D1",
          title: "D1",
          meaning: "本命盘",
          division: 1,
          chart: toNorthIndianChart(block),
        });
      }
    }
  }
  return vargas;
}

function d9SignFor(name: string, vargaPacket: Record<string, unknown> | null): string | null {
  const result = record(vargaPacket?.result) ?? {};
  const d9 = vargaKey(9, result);
  const planet = asPlanetMap(d9?.planets)[name];
  return text(planet?.sign);
}

function planetRows(chart: Record<string, unknown>, vargaPacket: Record<string, unknown> | null) {
  const planets = asPlanetMap(chart.planets);
  const ascSign = text(record(chart.ascendant)?.sign) ?? "Aries";
  return PLANET_ORDER.flatMap((name) => {
    const planet = planets[name];
    if (!planet) return [];
    const sign = text(planet.sign) ?? "Aries";
    const d9 = d9SignFor(name, vargaPacket);
    return [{
      name,
      label: planetZh(name),
      sign,
      signLabel: signZh(sign),
      degreeInSign: planetDegreeInSign(planet),
      house: houseFromPlanet(planet, ascSign),
      retrograde: Boolean(planet.retrograde),
      status: statusLabel(planet),
      nakshatra: text(planet.nakshatra) ?? "—",
      pada: Math.min(4, Math.max(1, Math.trunc(finite(planet.nakshatra_pada) ?? 1))),
      nakshatraLord: planetZh(text(planet.nakshatra_lord) ?? "—"),
      d9Sign: d9,
      d9SignLabel: d9 ? signZh(d9) : null,
      symbol: traditionalSymbol(name, sign),
    }];
  });
}

/**
 * The ascendant as a planet-table row. Sign and degree come straight from the
 * engine's `ascendant`; nakshatra, pada and their lord stay null because the
 * engine does not return them for a chart point and they must not be guessed.
 */
function ascendantRow(chart: Record<string, unknown>) {
  const ascendant = record(chart.ascendant);
  const sign = text(ascendant?.sign);
  if (!ascendant || !sign) return null;
  const nakshatra = text(ascendant.nakshatra);
  const pada = finite(ascendant.nakshatra_pada);
  const lord = text(ascendant.nakshatra_lord);
  return {
    label: "上升",
    abbr: "As",
    sign,
    signLabel: signZh(sign),
    degreeInSign: planetDegreeInSign(ascendant),
    house: 1 as const,
    retrograde: false as const,
    nakshatra,
    pada: pada === null ? null : Math.min(4, Math.max(1, Math.trunc(pada))),
    nakshatraLord: lord ? planetZh(lord) : null,
  };
}

/**
 * The Moon chart: the natal block with the Moon's sign as house 1. Every sign,
 * degree and direction is the D1's; only the house count changes.
 */
function moonChart(chart: Record<string, unknown>, vargaPacket: Record<string, unknown> | null): ChartViewMoonChart | null {
  const block = natalBlock(chart);
  const moon = asPlanetMap(chart.planets).Moon;
  const moonSign = text(moon?.sign);
  const natalAsc = text(record(chart.ascendant)?.sign);
  if (!block || !moon || !moonSign || !isSignName(moonSign) || !natalAsc || !isSignName(natalAsc)) return null;
  const moonBlock: ReportChartBlock = {
    ...block,
    id: "MOON",
    title: "月亮盘",
    ascendant: { sign: moonSign, degree: Math.min(29.999, Math.max(0, planetDegreeInSign(moon))) },
  };
  return {
    moonSign,
    moonSignLabel: signZh(moonSign),
    ascendantHouse: houseFromSigns(natalAsc, moonSign),
    chart: toNorthIndianChart(moonBlock),
    planets: planetRows(chart, vargaPacket).map((row) => ({ ...row, house: houseFromSigns(row.sign, moonSign) })),
  };
}

function unavailableTransit(reason: string): ChartViewUnavailableLayer {
  return { status: "unavailable", reason, copy: CHART_VIEW_COPY.unavailable };
}

/**
 * Today's positions placed in the natal houses. The rows are the ephemeris
 * page's own projection (`transitsFromEngine`), so the two pages agree.
 */
function mapTransit(
  raw: Record<string, unknown> | null | undefined,
  chart: Record<string, unknown>,
  profile: ChartViewProfileInput,
  asOf: string,
): ChartViewTransitOk | ChartViewUnavailableLayer {
  if (!raw) return unavailableTransit("not_requested");
  const natalAsc = text(record(chart.ascendant)?.sign);
  if (!natalAsc || !isSignName(natalAsc)) return unavailableTransit("natal_ascendant_missing");
  const { bodies } = transitsFromEngine({ transitChart: raw, natalChart: chart });
  const natalPlanets = asPlanetMap(chart.planets);
  const rows = bodies.flatMap((body) => {
    if (body.natalHouse === null || !isSignName(body.sign)) return [];
    const natal = natalPlanets[body.planet];
    return [{
      name: body.planet,
      label: planetZh(body.planet),
      sign: body.sign,
      signLabel: signZh(body.sign),
      degreeInSign: body.degreeInSign,
      retrograde: body.retrograde,
      natalHouse: body.natalHouse,
      natalPlanetHouse: natal ? houseFromPlanet(natal, natalAsc) : null,
    }];
  });
  if (rows.length === 0) return unavailableTransit("payload_incomplete");
  const block: ReportChartBlock = {
    version: 1,
    id: "D1",
    title: "行运",
    layout: "north",
    ascendant: { sign: natalAsc, degree: Math.min(29.999, Math.max(0, planetDegreeInSign(record(chart.ascendant) ?? {}))) },
    planets: rows.map((row) => ({
      name: row.name as ReportChartBlock["planets"][number]["name"],
      sign: row.sign,
      degree: Math.min(29.999, Math.max(0, row.degreeInSign)),
      retrograde: row.retrograde,
    })),
  };
  return {
    status: "ok",
    date: isoDay(asOf),
    time: TRANSIT_LOCAL_TIME,
    timezoneLabel: profile.timezoneId || `UTC${profile.timezoneOffset >= 0 ? "+" : ""}${profile.timezoneOffset}`,
    chart: toNorthIndianChart(block),
    rows,
  };
}

function unavailableBhava(reason: string): ChartViewUnavailableLayer {
  return { status: "unavailable", reason, copy: CHART_VIEW_COPY.unavailable };
}

function signAt(lon: number): { sign: (typeof SIGN_ORDER)[number]; degree: number } {
  const normalized = ((lon % 360) + 360) % 360;
  return { sign: SIGN_ORDER[Math.floor(normalized / 30) % 12]!, degree: normalized % 30 };
}

/**
 * Sripati Bhava Chalit from `/api/bhava_chalit` (mode `compare`). Refuses to
 * draw anything the engine did not compute as Sripati from a real MC: a
 * fallback, a missing boundary table, or the old `asc + 270` placeholder MC
 * (BUG-1077) all come back unavailable instead of an equal-house chart.
 */
function mapBhava(raw: Record<string, unknown> | null | undefined, chart: Record<string, unknown>): ChartViewBhavaOk | ChartViewUnavailableLayer {
  if (!raw) return unavailableBhava("not_requested");
  const result = record(raw.result);
  if (!result) return unavailableBhava("payload_incomplete");
  if (text(raw.selected_house_system) !== "sripati" || text(raw.fallback_reason)) return unavailableBhava("house_system_fallback");
  const asc = finite(result.ascendant_lon);
  const mc = finite(result.mc_lon);
  if (asc === null || mc === null) return unavailableBhava("mc_missing");
  const placeholder = (asc + 270) % 360;
  if (Math.abs(mc - placeholder) < 1e-6) return unavailableBhava("mc_placeholder");
  const natalAsc = text(record(chart.ascendant)?.sign);
  if (!natalAsc || !isSignName(natalAsc)) return unavailableBhava("natal_ascendant_missing");
  const rashi = asPlanetMap(result.rashi_chart);
  const bhavaHouses = record(result.bhava_chart) ?? {};
  const rows: ChartViewBhavaOk["rows"] = [];
  for (const name of PLANET_ORDER) {
    const planet = rashi[name];
    const sign = text(planet?.sign);
    const rashiHouse = finite(planet?.house);
    const bhavaHouse = finite(bhavaHouses[name]);
    if (!planet || !sign || !isSignName(sign) || rashiHouse === null || bhavaHouse === null) continue;
    rows.push({
      name,
      label: planetZh(name),
      sign,
      signLabel: signZh(sign),
      degreeInSign: Math.min(29.9999, Math.max(0, finite(planet.degree_in_sign) ?? 0)),
      rashiHouse: Math.trunc(rashiHouse),
      bhavaHouse: Math.trunc(bhavaHouse),
      shifted: Math.trunc(bhavaHouse) !== Math.trunc(rashiHouse),
    });
  }
  const houses = Array.isArray(record(result.boundaries)?.houses) ? record(result.boundaries)!.houses as unknown[] : [];
  const cusps: ChartViewBhavaOk["cusps"] = houses.flatMap((entry) => {
    const house = record(entry);
    const number = finite(house?.house);
    const cusp = finite(house?.cusp_lon);
    const sandhi = finite(house?.sandhi_start_lon);
    if (!house || number === null || cusp === null || sandhi === null) return [];
    const at = signAt(cusp);
    const start = signAt(sandhi);
    return [{
      house: Math.trunc(number),
      sign: at.sign,
      signLabel: signZh(at.sign),
      degreeInSign: at.degree,
      sandhiSign: start.sign,
      sandhiSignLabel: signZh(start.sign),
      sandhiDegreeInSign: start.degree,
    }];
  });
  if (rows.length === 0 || cusps.length !== 12) return unavailableBhava("payload_incomplete");
  // Draw each body in its Bhava house: the North Indian block places a body by
  // sign, so hand it the sign that occupies that house from the natal lagna.
  const ascIndex = SIGN_ORDER.indexOf(natalAsc);
  const block: ReportChartBlock = {
    version: 1,
    id: "D1",
    title: "Bhava",
    layout: "north",
    ascendant: { sign: natalAsc, degree: Math.min(29.999, Math.max(0, planetDegreeInSign(record(chart.ascendant) ?? {}))) },
    planets: rows.map((row) => ({
      name: row.name as ReportChartBlock["planets"][number]["name"],
      sign: SIGN_ORDER[(ascIndex + row.bhavaHouse - 1) % 12]!,
      degree: Math.min(29.999, row.degreeInSign),
      retrograde: Boolean(asPlanetMap(chart.planets)[row.name]?.retrograde),
    })),
  };
  return { status: "ok", houseSystem: "Sripati", chart: toNorthIndianChart(block), rows, cusps };
}

function vimshottariTrack(chart: Record<string, unknown>, asOf: string) {
  const dasha = record(chart.dasha) ?? {};
  const rawPeriods = Array.isArray(dasha.periods) ? dasha.periods : [];
  const periods = rawPeriods.flatMap((entry) => {
    const row = record(entry);
    if (!row) return [];
    const lord = text(row.lord);
    const start = text(row.start);
    const end = text(row.end);
    if (!lord || !start || !end) return [];
    const startIso = isoDay(start);
    const endIso = isoDay(end);
    const startIndex = VIMSHOTTARI_ORDER.indexOf(lord as (typeof VIMSHOTTARI_ORDER)[number]);
    const order = startIndex >= 0
      ? VIMSHOTTARI_ORDER.map((_, index) => VIMSHOTTARI_ORDER[(startIndex + index) % VIMSHOTTARI_ORDER.length]!)
      : [...VIMSHOTTARI_ORDER];
    const weights = order.map((name) => VIMSHOTTARI_YEARS[name]);
    const antardashas = order.map((subLord, index) => {
      const span = addWeightedSpan(startIso, endIso, index, weights);
      return {
        lord: subLord,
        label: planetZh(subLord),
        start: span.start,
        end: span.end,
        current: containsDay(span.start, span.end, asOf),
        derived: true,
      };
    });
    return [{
      lord,
      label: planetZh(lord),
      sign: null,
      start: startIso,
      end: endIso,
      current: containsDay(startIso, endIso, asOf),
      derived: false,
      antardashas,
    }];
  });
  const current = periods.find((item) => item.current);
  const currentAntar = current?.antardashas.find((item) => item.current);
  const currentLabel = current
    ? `${planetZh(current.lord)}大运 / ${currentAntar ? planetZh(currentAntar.lord) : "—"}分运`
    : "未落入已返回的时段";
  return {
    id: "vimshottari" as const,
    title: "Vimshottari",
    method: "Vimshottari",
    currentLabel,
    antardashaNote: ANTARDASHA_DERIVED_NOTE,
    periods,
  };
}

function charaTrack(charaPacket: Record<string, unknown> | null, birthDate: string, asOf: string) {
  const result = record(charaPacket?.result) ?? charaPacket;
  const chara = record(result?.chara_dasha) ?? result;
  const sequence = Array.isArray(chara?.dasha_sequence) ? chara.dasha_sequence : [];
  let cursor = birthDate;
  const periods = sequence.flatMap((entry) => {
    const row = record(entry);
    if (!row) return [];
    const sign = text(row.sign);
    const lord = text(row.lord) ?? sign ?? "—";
    const rawDuration = finite(row.duration_years);
    const duration = rawDuration === null ? 1 : rawDuration;
    const zeroYear = duration === 0;
    const start = cursor;
    const end = addYears(start, duration);
    cursor = end;
    const rawAntar = Array.isArray(row.antardashas) ? row.antardashas : [];
    const antardashas = zeroYear
      ? []
      : rawAntar.length > 0
      ? rawAntar.flatMap((antar, index) => {
        const item = record(antar);
        if (!item) return [];
        const weights = rawAntar.map((candidate) => finite(record(candidate)?.duration_years) ?? 1);
        const span = addWeightedSpan(start, end, index, weights);
        const antarLord = text(item.lord) ?? text(item.sign) ?? "—";
        return [{
          lord: antarLord,
          label: `${signZh(text(item.sign) ?? antarLord)} / ${planetZh(antarLord)}`,
          start: span.start,
          end: span.end,
          current: containsDay(span.start, span.end, asOf),
          derived: true,
        }];
      })
      : SIGN_ORDER.map((antarSign, index) => {
        const span = addWeightedSpan(start, end, index, SIGN_ORDER.map(() => 1));
        return {
          lord: antarSign,
          label: signZh(antarSign),
          start: span.start,
          end: span.end,
          current: containsDay(span.start, span.end, asOf),
          derived: true,
        };
      });
    return [{
      lord,
      label: `${signZh(sign ?? lord)} / ${planetZh(lord)}`,
      sign: sign,
      start,
      end,
      current: containsDay(start, end, asOf),
      derived: false,
      ...(zeroYear ? { zeroYear: true as const } : {}),
      antardashas,
    }];
  });
  const current = periods.find((item) => item.current);
  const currentAntar = current?.antardashas.find((item) => item.current);
  const currentLabel = current
    ? `${current.label}${currentAntar ? ` / ${currentAntar.label}` : ""}`
    : "未落入已返回的时段";
  return {
    id: "chara" as const,
    title: "Chara Dasha（kn_rao 变体）",
    method: text(chara?.method) === "Chara Dasha (kn_rao)"
      ? "Chara Dasha（kn_rao 变体）"
      : (text(chara?.method) ?? "Chara Dasha（kn_rao 变体）"),
    currentLabel,
    antardashaNote: CHARA_ANTARDASHA_DATE_NOTE,
    periods,
  };
}

function unavailableWestern(reason: string): ChartViewUnavailableLayer {
  return { status: "unavailable", reason, copy: WESTERN_UNAVAILABLE_COPY };
}

function mapWestern(raw: Record<string, unknown> | null, ayanamsaDisplay: string): ChartViewWesternOk | ChartViewUnavailableLayer {
  if (!raw) return unavailableWestern("endpoint_missing");
  const natal = record(raw.natal) ?? raw;
  const ascendant = record(natal.ascendant);
  const planetsRaw = record(natal.planets);
  const housesRaw = Array.isArray(natal.houses) ? natal.houses : [];
  if (!ascendant || !planetsRaw || housesRaw.length !== 12) return unavailableWestern("payload_incomplete");
  const ascLon = finite(ascendant.longitude);
  if (ascLon === null) return unavailableWestern("payload_incomplete");
  const planets = Object.entries(planetsRaw).flatMap(([id, value]) => {
    const planet = record(value);
    if (!planet) return [];
    const longitude = finite(planet.longitude);
    const sign = text(planet.sign);
    if (longitude === null || !sign) return [];
    return [{
      id,
      label: WESTERN_BODY_ZH[id] ?? id,
      longitude,
      sign,
      signLabel: signZh(sign),
      degreeInSign: finite(planet.degree_in_sign) ?? (longitude % 30),
      house: finite(planet.house) !== null ? Math.trunc(finite(planet.house)!) : null,
      retrograde: Boolean(planet.retrograde),
    }];
  });
  const houses = housesRaw.flatMap((entry, index) => {
    const row = record(entry);
    const cusp = record(row?.cusp) ?? row;
    if (!cusp) return [];
    const longitude = finite(cusp.longitude);
    const sign = text(cusp.sign);
    if (longitude === null || !sign) return [];
    return [{
      house: Math.trunc(finite(row?.house) ?? index + 1),
      longitude,
      sign,
      signLabel: signZh(sign),
      degreeInSign: finite(cusp.degree_in_sign) ?? (longitude % 30),
    }];
  });
  if (planets.length === 0 || houses.length !== 12) return unavailableWestern("payload_incomplete");
  const aspectsRaw = Array.isArray(natal.aspects) ? natal.aspects : [];
  const aspects = aspectsRaw.flatMap((entry) => {
    const row = record(entry);
    if (!row) return [];
    const left = text(row.left);
    const right = text(row.right);
    const aspect = text(row.aspect);
    if (!left || !right || !aspect) return [];
    return [{
      left: WESTERN_BODY_ZH[left] ?? left,
      right: WESTERN_BODY_ZH[right] ?? right,
      aspect,
      aspectLabel: ASPECT_ZH[aspect] ?? aspect,
      orb: finite(row.orb) ?? 0,
    }];
  });
  const distribution = record(natal.distribution);
  const elementsRaw = record(distribution?.elements) ?? {};
  const modesRaw = record(distribution?.modes) ?? {};
  return {
    status: "ok",
    zodiac: "tropical",
    houseSystem: text(raw.house_system) ?? "P",
    boundary: COORDINATE_BOUNDARY.western,
    ayanamsaGapNote: `回归黄道与本页印度盘所用${ayanamsaDisplay}岁差不是同一套；差值随日期变，不能把两边度数对过去。`,
    ascendantLongitude: ascLon,
    planets,
    houses,
    aspects,
    elements: ["fire", "earth", "air", "water"].map((id) => ({
      id,
      label: ELEMENT_ZH[id] ?? id,
      count: Math.max(0, Math.trunc(finite(elementsRaw[id]) ?? 0)),
    })),
    modes: ["cardinal", "fixed", "mutable"].map((id) => ({
      id,
      label: MODE_ZH[id] ?? id,
      count: Math.max(0, Math.trunc(finite(modesRaw[id]) ?? 0)),
    })),
  };
}

export function buildChartView(bundle: ChartViewEngineBundle): ChartViewOk {
  const { chart, varga, chara, western, bhava, transit, profile, asOf } = bundle;
  const planets = asPlanetMap(chart.planets);
  const moon = planets.Moon ?? {};
  const ascendant = record(chart.ascendant);
  const birth = record(chart.birth) ?? {};
  const ayanamsa = text(birth.ayanamsa_name) ?? profile.ayanamsa ?? "raman";
  const ayanamsaDisplay = text(birth.ayanamsa_display) ?? ayanamsa;
  const nodeMode = text(birth.node_mode) === "true" ? "true" : "mean";
  const vargas = buildVargas(chart, varga);
  if (vargas.length === 0) throw new Error("vedic_chart_unavailable");
  const vimshottari = vimshottariTrack(chart, asOf);
  const charaMapped = charaTrack(chara, profile.date, asOf);
  const placeLabel = profile.placeLabel?.trim()
    || formatCoord(profile.latitude, profile.longitude);
  const view = {
    status: "ok" as const,
    billed: false as const,
    profile: {
      name: profile.name?.trim() || "未命名",
      date: profile.date,
      time: profile.time.slice(0, 5),
      placeLabel,
      latitude: profile.latitude,
      longitude: profile.longitude,
      timezoneOffset: profile.timezoneOffset,
      timezoneLabel: profile.timezoneId || `UTC${profile.timezoneOffset >= 0 ? "+" : ""}${profile.timezoneOffset}`,
      ayanamsa,
      ayanamsaDisplay,
      nodeMode,
      nodeModeLabel: nodeModeLabel(nodeMode),
      birthTimeStatus: profile.birthTimeStatus ?? "reported",
      birthTimeStatusLabel: birthTimeStatusLabel(profile.birthTimeStatus ?? "reported"),
      engineName: "Swiss Ephemeris（本站）",
      moonNakshatra: text(moon.nakshatra) ?? "—",
      moonPada: Math.min(4, Math.max(1, Math.trunc(finite(moon.nakshatra_pada) ?? 1))),
      ascendantSign: text(ascendant?.sign) ?? "—",
      ascendantSignLabel: signZh(text(ascendant?.sign) ?? "—"),
      currentDashaLabel: vimshottari.currentLabel,
    },
    vedic: {
      coordinateSystem: "sidereal" as const,
      boundary: COORDINATE_BOUNDARY.vedic,
      vargas,
      ascendant: ascendantRow(chart),
      planets: planetRows(chart, varga),
      moon: moonChart(chart, varga),
    },
    dasha: {
      asOf: isoDay(asOf),
      vimshottari,
      chara: charaMapped,
      dualTrackNote: DASHA_DUAL_TRACK_NOTE,
    },
    western: mapWestern(western, ayanamsaDisplay),
    bhava: mapBhava(bhava, chart),
    transit: mapTransit(transit, chart, profile, asOf),
  };
  return chartViewOkSchema.parse(view);
}

export function engineChartHasPlanets(chart: Record<string, unknown>): boolean {
  return PLANET_ORDER.some((name) => Boolean(asPlanetMap(chart.planets)[name]));
}