import { isAyanamsaName, resolveAyanamsa } from "./ayanamsa.ts";
import { parseProfileGender } from "./profile-gender.ts";
import { MAX_OTHER_SUBJECTS } from "./subject-birth.ts";

const CLOCK = /^(?:[01]\d|2[0-3]):[0-5]\d$/;
const DATE = /^(?:19|20)\d{2}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])$/;
const SOURCES = ["hospital_record", "family_exact", "approximate", "period_only", "unknown", "legacy_import"] as const;
const PERIODS = ["early_morning", "morning", "afternoon", "evening", "late_night"] as const;
const STATUSES = ["reported", "assessing", "rectifying", "candidate"] as const;

export type ChartSubjectWrite = {
  readonly columns: Record<string, string | number | null>;
  readonly profile: Record<string, unknown>;
};

function recordOf(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, max: number): string {
  return typeof value === "string" ? value.trim().slice(0, max) : "";
}

function clock(value: unknown): string | null {
  const raw = text(value, 8);
  return CLOCK.test(raw) ? raw : null;
}

function date(value: unknown): string | null {
  const raw = text(value, 10);
  if (!DATE.test(raw)) return null;
  const parsed = new Date(`${raw}T00:00:00Z`);
  if (Number.isNaN(parsed.getTime()) || parsed.toISOString().slice(0, 10) !== raw) return null;
  return raw;
}

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 oneOf<T extends string>(value: unknown, allowed: readonly T[]): T | null {
  const raw = text(value, 40);
  return allowed.find((item) => item === raw) ?? null;
}

function minutes(value: unknown): number | null {
  const parsed = finite(value);
  if (parsed == null || !Number.isInteger(parsed) || parsed < 0 || parsed > 720) return null;
  return parsed;
}

export function parseChartSubjectWrite(value: unknown): { ok: true; write: ChartSubjectWrite } | { ok: false; error: string } {
  const profile = recordOf(value);
  if (!profile) return { ok: false, error: "星盘资料格式不正确" };
  if ("active_birth_time" in profile || "activeBirthTime" in profile
    || "active_birth_date" in profile || "activeDate" in profile
    || "active_birth_timezone_offset" in profile || "activeTimezoneOffset" in profile) {
    return { ok: false, error: "不能直接写入排盘采用时间" };
  }
  const statusRaw = text(profile.birthTimeStatus ?? profile.birth_time_status, 40);
  if (statusRaw === "accepted" || statusRaw === "confirmed") {
    return { ok: false, error: "不能把出生时间标成已采用" };
  }
  const name = text(profile.name, 80);
  if (!name) return { ok: false, error: "请填写称呼" };
  const birthDate = date(profile.date ?? profile.birth_date);
  const reported = clock(profile.reportedTime ?? profile.reported_birth_time);
  const source = oneOf(profile.birthTimeSource ?? profile.birth_time_source, SOURCES);
  const period = oneOf(profile.birthTimePeriod ?? profile.birth_time_period, PERIODS);
  const windowStart = clock(profile.declaredWindowStart ?? profile.declared_window_start);
  const windowEnd = clock(profile.declaredWindowEnd ?? profile.declared_window_end);
  const before = minutes(profile.uncertaintyBeforeMinutes ?? profile.uncertainty_before_minutes);
  const after = minutes(profile.uncertaintyAfterMinutes ?? profile.uncertainty_after_minutes);
  const latitude = finite(profile.latitude);
  const longitude = finite(profile.longitude);
  if (latitude != null && (latitude < -90 || latitude > 90)) return { ok: false, error: "出生地坐标不正确" };
  if (longitude != null && (longitude < -180 || longitude > 180)) return { ok: false, error: "出生地坐标不正确" };
  const timezoneOffset = finite(profile.timezoneOffset ?? profile.timezone_offset);
  const timezoneId = text(profile.timezoneId ?? profile.timezone_id, 80);
  const label = text(profile.birthPlaceLabel ?? profile.birth_place_label, 160);
  const status = oneOf(statusRaw, STATUSES) ?? (reported ? "reported" : null);
  const ayanamsa = isAyanamsaName(profile.ayanamsa) ? profile.ayanamsa : resolveAyanamsa(profile);
  // Optional gender: written only when the client sends the key, so a caller
  // that does not know the field never clears it. null / "" clear it.
  const genderSent = Object.prototype.hasOwnProperty.call(profile, "gender");
  const gender = parseProfileGender(profile.gender);
  if (genderSent && profile.gender != null && profile.gender !== "" && !gender) {
    return { ok: false, error: "性别只能选女、男或不填" };
  }
  const columns: Record<string, string | number | null> = {
    name,
    birth_date: birthDate,
    reported_birth_time: reported,
    birth_time_source: source,
    birth_time_period: period,
    declared_window_start: windowStart,
    declared_window_end: windowEnd,
    uncertainty_before_minutes: before,
    uncertainty_after_minutes: after,
    latitude,
    longitude,
    timezone_id: timezoneId || null,
    timezone_offset: timezoneOffset,
    birth_place_label: label || null,
    birth_place_type: text(profile.birthPlaceType ?? profile.birth_place_type, 40) || null,
    birth_place_provider: text(profile.birthPlaceProvider ?? profile.birth_place_provider, 40) || null,
    birth_place_provider_id: text(profile.birthPlaceProviderId ?? profile.birth_place_provider_id, 120) || null,
    ayanamsa,
    birth_time_status: status,
    ...(genderSent ? { gender } : {}),
  };
  const mirror = {
    name,
    date: birthDate ?? "",
    time: reported ?? "",
    reportedTime: reported ?? "",
    birthTimeSource: source ?? "",
    birthTimePeriod: period ?? "",
    declaredWindowStart: windowStart ?? "",
    declaredWindowEnd: windowEnd ?? "",
    uncertaintyBeforeMinutes: before,
    uncertaintyAfterMinutes: after,
    birthTimeStatus: status ?? "",
    countryCode: text(profile.countryCode ?? profile.country_code, 8) || "CN",
    provinceCode: text(profile.provinceCode ?? profile.province_code, 20),
    cityCode: text(profile.cityCode ?? profile.city_code, 20),
    districtCode: text(profile.districtCode ?? profile.district_code, 20),
    birthPlaceLabel: label,
    birthPlaceType: columns.birth_place_type ?? "",
    birthPlaceProvider: columns.birth_place_provider ?? "",
    birthPlaceProviderId: columns.birth_place_provider_id ?? "",
    timezoneId,
    timezoneSource: text(profile.timezoneSource ?? profile.timezone_source, 40),
    latitude,
    longitude,
    timezoneOffset,
    ayanamsa,
  };
  return { ok: true, write: { columns, profile: mirror } };
}

export function libraryProfileFromSubjectRow(row: Record<string, unknown>): Record<string, unknown> {
  const stored = recordOf(row.profile) ?? {};
  const reported = typeof row.reported_birth_time === "string" ? row.reported_birth_time.slice(0, 5) : "";
  const active = typeof row.active_birth_time === "string" ? row.active_birth_time.slice(0, 5) : "";
  const status = typeof row.birth_time_status === "string" ? row.birth_time_status : "";
  const chartTime = status === "accepted" || status === "confirmed" ? (active || reported) : reported;
  return {
    name: typeof row.name === "string" ? row.name : "",
    date: typeof row.birth_date === "string" ? row.birth_date.slice(0, 10) : "",
    time: chartTime,
    reportedTime: reported,
    birthTimeSource: typeof row.birth_time_source === "string" ? row.birth_time_source : "",
    birthTimePeriod: typeof row.birth_time_period === "string" ? row.birth_time_period : "",
    declaredWindowStart: typeof row.declared_window_start === "string" ? row.declared_window_start.slice(0, 5) : "",
    declaredWindowEnd: typeof row.declared_window_end === "string" ? row.declared_window_end.slice(0, 5) : "",
    uncertaintyBeforeMinutes: typeof row.uncertainty_before_minutes === "number" ? row.uncertainty_before_minutes : null,
    uncertaintyAfterMinutes: typeof row.uncertainty_after_minutes === "number" ? row.uncertainty_after_minutes : null,
    birthTimeStatus: status,
    countryCode: typeof stored.countryCode === "string" ? stored.countryCode : "CN",
    provinceCode: typeof stored.provinceCode === "string" ? stored.provinceCode : "",
    cityCode: typeof stored.cityCode === "string" ? stored.cityCode : "",
    districtCode: typeof stored.districtCode === "string" ? stored.districtCode : "",
    birthPlaceLabel: typeof row.birth_place_label === "string" ? row.birth_place_label : "",
    birthPlaceType: typeof row.birth_place_type === "string" ? row.birth_place_type : "",
    birthPlaceProvider: typeof row.birth_place_provider === "string" ? row.birth_place_provider : "",
    birthPlaceProviderId: typeof row.birth_place_provider_id === "string" ? row.birth_place_provider_id : "",
    timezoneId: typeof row.timezone_id === "string" ? row.timezone_id : "",
    timezoneSource: typeof stored.timezoneSource === "string" ? stored.timezoneSource : "",
    latitude: typeof row.latitude === "number" ? row.latitude : null,
    longitude: typeof row.longitude === "number" ? row.longitude : null,
    timezoneOffset: typeof row.timezone_offset === "number" ? row.timezone_offset : null,
    ayanamsa: resolveAyanamsa(row),
    ...(parseProfileGender(row.gender) ? { gender: parseProfileGender(row.gender) } : {}),
    ...(typeof row.active_birth_date === "string" ? { activeDate: row.active_birth_date.slice(0, 10) } : {}),
    ...(typeof row.active_birth_timezone_offset === "number"
      ? { activeTimezoneOffset: row.active_birth_timezone_offset }
      : {}),
  };
}

export function subjectLimitReached(otherCount: number): boolean {
  return otherCount >= MAX_OTHER_SUBJECTS;
}