/**
 * Cross-domain evidence for the AI Insight cards.
 *
 * A page's own payload can only ever say WHAT happened on that page — "mortalitas
 * 9,1%, di atas standar". Answering WHY needs the other domains: the temperature
 * on the days the deaths spiked, the feed intake that fell first, the growth that
 * stalled. This module gathers those series once per cycle and hands them to the
 * card as a `diagnostik` bundle.
 *
 * The correlation itself is NOT done here — `backend/services/rootCauseAnalysis.js`
 * does it, so the dashboard path and every page path reach the same conclusions
 * from the same code. This file only collects and normalises.
 */

import { apiClient } from '../services/apiService.ts';

export interface DiagnostikBundle {
  hari_ke: number | null;
  total_hari?: number | null;
  populasi_awal_ekor: number | null;
  populasi_kini_ekor?: number | null;
  keseragaman_persen?: number | null;
  mortalitas_harian: Array<{ hari: number; mati: number; afkir: number; panen?: number }>;
  bobot_harian: Array<{ hari: number; aktual_gram: number; target_gram: number | null }>;
  fcr_harian: Array<{ hari: number; aktual: number; standar: number | null }>;
  pakan_harian: Array<{ hari: number; karung: number }>;
  lingkungan_harian: Array<{ hari: number; suhu_C: number; kelembapan_persen: number }>;
}

export interface DiagnostikInput {
  cycleId: string | null | undefined;
  /**
   * External coop UUID for the scales/sensor APIs.
   *
   * `getMultiCoopWeightData` returns null without it, so with "semua kandang"
   * selected the weight/feed/FCR series are simply absent — which the analysis
   * reports as missing data rather than as zeros.
   */
  cageUuid: string | null | undefined;
  /** Internal kandang id, for scoping the mortality ledger on our own backend. */
  kandangId?: number | null;
  startDate: Date | string | null | undefined;
  currentDay: number | null | undefined;
  totalDays?: number | null;
  populasiAwal?: number | null;
  populasiKini?: number | null;
  keseragaman?: number | null;
  apiMode?: 'LIVE' | 'DEMO';
  /**
   * The mortality ledger, when the caller already has it.
   *
   * It is the authoritative record of deaths, culls and harvest — the KPI feed
   * carries deaths only, and reading a population drop as deaths is what once
   * made the counting page announce "mortalitas 100%".
   */
  mortalityRows?: Array<{
    day?: number | null;
    mortalityCount?: number | null;
    afkir?: number | null;
    panen?: number | null;
  }> | null;
}

const toNum = (value: unknown): number | null => {
  const parsed = typeof value === 'string' ? Number.parseFloat(value) : value;
  return typeof parsed === 'number' && Number.isFinite(parsed) ? parsed : null;
};

const isoDate = (date: Date): string => {
  const yyyy = date.getFullYear();
  const mm = String(date.getMonth() + 1).padStart(2, '0');
  const dd = String(date.getDate()).padStart(2, '0');
  return `${yyyy}-${mm}-${dd}`;
};

/**
 * One fetch per cycle-day, shared by every card on every page.
 *
 * Six insight cards mounting in one session would otherwise pull the whole
 * cycle's sensor history six times. The day is part of the key so the data still
 * refreshes when the cycle moves on.
 */
const _bundleCache = new Map<string, Promise<DiagnostikBundle | null>>();

const buildBundle = async (input: DiagnostikInput): Promise<DiagnostikBundle | null> => {
  const currentDay = toNum(input.currentDay);
  const start = input.startDate ? new Date(input.startDate) : null;
  const mode = input.apiMode ?? 'LIVE';

  // Both sources are optional: a missing one must degrade to "data tidak
  // tersedia" in the insight, never block the card from generating.
  // The ledger is fetched here when the caller has none of its own. It is the
  // only source that separates deaths from culls and from harvest, and it works
  // for "semua kandang" too — unlike the KPI feed, which needs a cage UUID.
  const needsLedger = !Array.isArray(input.mortalityRows) || input.mortalityRows.length === 0;

  const [kpiResult, envResult, ledgerResult] = await Promise.allSettled([
    apiClient.getMultiCoopWeightData(mode, input.cageUuid ?? null),
    start && Number.isFinite(start.getTime())
      ? apiClient.getIotDailyEnvironment(isoDate(start), isoDate(new Date()), mode)
      : Promise.resolve([]),
    needsLedger && input.cycleId
      ? apiClient.getMortalityRecords(input.cycleId, input.kandangId ?? undefined)
      : Promise.resolve([]),
  ]);

  const kpiRows: Record<string, Record<string, unknown>> = kpiResult.status === 'fulfilled' &&
  kpiResult.value &&
  typeof kpiResult.value === 'object'
    ? (kpiResult.value as Record<string, Record<string, unknown>>)
    : {};
  const envRows =
    envResult.status === 'fulfilled' && Array.isArray(envResult.value) ? envResult.value : [];

  if (kpiResult.status === 'rejected') {
    console.warn('[insightEvidence] KPI harian tidak terambil:', kpiResult.reason);
  }
  if (envResult.status === 'rejected') {
    console.warn('[insightEvidence] Riwayat lingkungan tidak terambil:', envResult.reason);
  }
  if (ledgerResult.status === 'rejected') {
    console.warn('[insightEvidence] Catatan mortalitas tidak terambil:', ledgerResult.reason);
  }

  const mortalitas_harian: DiagnostikBundle['mortalitas_harian'] = [];
  const bobot_harian: DiagnostikBundle['bobot_harian'] = [];
  const fcr_harian: DiagnostikBundle['fcr_harian'] = [];
  const pakan_harian: DiagnostikBundle['pakan_harian'] = [];

  for (const [key, row] of Object.entries(kpiRows)) {
    const index = Number.parseInt(key, 10);
    if (!Number.isFinite(index) || !row || typeof row !== 'object') continue;
    // The KPI feed is keyed 0-based; every other series in the app counts days
    // from 1, and mixing the two shifts every correlation by a day.
    const hari = index + 1;

    const mati = toNum(row.mortality);
    if (mati !== null && mati >= 0) mortalitas_harian.push({ hari, mati, afkir: 0 });

    const bobot = toNum(row.iot_weight) ?? toNum(row.manual_weight);
    if (bobot !== null && bobot > 0) {
      bobot_harian.push({ hari, aktual_gram: bobot, target_gram: toNum(row.ref_weight) });
    }

    const fcr = toNum(row.iot_fcr) ?? toNum(row.manual_fcr);
    if (fcr !== null && fcr > 0) fcr_harian.push({ hari, aktual: fcr, standar: null });

    const karung = toNum(row.food);
    if (karung !== null && karung >= 0) pakan_harian.push({ hari, karung });
  }

  // The ledger wins over the KPI feed either way: it separates deaths from culls
  // and from harvest, which the KPI feed does not.
  const fetchedLedger =
    ledgerResult.status === 'fulfilled' && Array.isArray(ledgerResult.value)
      ? (ledgerResult.value as DiagnostikInput['mortalityRows'])
      : [];
  const ledger =
    !needsLedger && Array.isArray(input.mortalityRows)
      ? input.mortalityRows
      : (fetchedLedger ?? []);
  const ledgerRows = ledger
    .map((row) => ({
      hari: toNum(row.day),
      mati: toNum(row.mortalityCount) ?? 0,
      afkir: toNum(row.afkir) ?? 0,
      panen: toNum(row.panen) ?? 0,
    }))
    .filter(
      (row): row is { hari: number; mati: number; afkir: number; panen: number } =>
        row.hari !== null
    );

  const sortByDay = <T extends { hari: number }>(rows: T[]) => rows.sort((a, b) => a.hari - b.hari);

  const bundle: DiagnostikBundle = {
    hari_ke: currentDay,
    total_hari: toNum(input.totalDays),
    populasi_awal_ekor: toNum(input.populasiAwal),
    populasi_kini_ekor: toNum(input.populasiKini),
    keseragaman_persen: toNum(input.keseragaman),
    mortalitas_harian: sortByDay(ledgerRows.length > 0 ? ledgerRows : mortalitas_harian),
    bobot_harian: sortByDay(bobot_harian),
    fcr_harian: sortByDay(fcr_harian),
    pakan_harian: sortByDay(pakan_harian),
    lingkungan_harian: sortByDay(
      envRows.map((row) => ({
        hari: row.hari,
        suhu_C: row.suhu_C,
        kelembapan_persen: row.kelembapan_persen,
      }))
    ),
  };

  const hasAnySeries =
    bundle.mortalitas_harian.length > 0 ||
    bundle.bobot_harian.length > 0 ||
    bundle.pakan_harian.length > 0 ||
    bundle.lingkungan_harian.length > 0;

  return hasAnySeries ? bundle : null;
};

/**
 * The `diagnostik` bundle for a cycle, or null when nothing could be gathered.
 *
 * Never throws: a card that cannot get its evidence still has to render its
 * insight, only without the causal section.
 */
export const getDiagnostikBundle = async (
  input: DiagnostikInput
): Promise<DiagnostikBundle | null> => {
  if (!input.cycleId) return null;
  const key = `${input.cycleId}|${input.cageUuid ?? 'all'}|${input.kandangId ?? 'all'}|${input.currentDay ?? '?'}`;
  const cached = _bundleCache.get(key);
  if (cached) return cached;

  const promise = buildBundle(input).catch((error) => {
    console.warn('[insightEvidence] Gagal menyusun bukti diagnostik:', error);
    _bundleCache.delete(key);
    return null;
  });
  _bundleCache.set(key, promise);
  return promise;
};

/** Same bundle, re-scoped to a chosen cycle day so a report for day 20 never cites day 30. */
export const scopeDiagnostikToDay = (
  bundle: DiagnostikBundle | null,
  day: number | null
): DiagnostikBundle | null => {
  if (!bundle) return null;
  if (day === null || !Number.isFinite(day)) return bundle;
  const cut = <T extends { hari: number }>(rows: T[]) => rows.filter((row) => row.hari <= day);
  return {
    ...bundle,
    hari_ke: day,
    mortalitas_harian: cut(bundle.mortalitas_harian),
    bobot_harian: cut(bundle.bobot_harian),
    fcr_harian: cut(bundle.fcr_harian),
    pakan_harian: cut(bundle.pakan_harian),
    lingkungan_harian: cut(bundle.lingkungan_harian),
  };
};