"use client";

/**
 * PticaScenarios — root of the ПТИЦА dark «Сценарии» tab (§22 Прогноз).
 *
 * Reads the REAL async forecast via useParcelForecastQuery(cad). The forecast is
 * enqueued fire-and-forget by /analyze on page mount — this hook only polls. While
 * the envelope is `pending` (or the first request is loading) we render a CALM
 * skeleton («Прогноз считается…»), NOT an error: the poll resolves once the report
 * is assembled. Once `report` is present we compose the sub-blocks:
 *   3 scenario cards · горизонты (chart + table) · сравнение · уверенность +
 *   рекомендованный продукт · прозрачность скоринга.
 *
 * The horizon (6/12/18 мес) selector lives in this tab's header; its state is
 * lifted to PticaPageContent so the hero/other tabs can share it.
 */

import styles from "@/app/site-finder/analysis/[cad]/ptica/ptica.module.css";
import { useParcelForecastQuery } from "@/lib/site-finder-api";
import type { ForecastReport, ForecastSegment } from "@/types/forecast";
import { ScenarioCards } from "./ScenarioCards";
import { HorizonForecast } from "./HorizonForecast";
import { ScenarioCompareTable } from "./ScenarioCompareTable";
import { ConfidencePanel } from "./ConfidencePanel";
import { RecommendedProduct } from "./RecommendedProduct";
import { ScoringTransparency } from "./ScoringTransparency";

interface Props {
  cad: string;
  horizon: number;
  onHorizonChange: (h: number) => void;
}

const HORIZONS = [6, 12, 18];

function segmentLabel(segment: ForecastSegment | undefined): string | null {
  if (!segment) return null;
  const parts = [segment.obj_class, segment.room_bucket].filter(
    (p): p is string => !!p,
  );
  return parts.length > 0 ? parts.join(" · ") : null;
}

export function PticaScenarios({ cad, horizon, onHorizonChange }: Props) {
  const { data, isLoading, error } = useParcelForecastQuery(cad);

  const header = (
    <div className={styles.viewHead}>
      <h2>
        Сценарии{" "}
        <span className={styles.viewSub}>
          прогноз спроса и предложения · §22
        </span>
      </h2>
      <div className={styles.horizonSel}>
        <span className={styles.horizonLab}>Горизонт</span>
        <div className={styles.seg} role="group" aria-label="Горизонт прогноза">
          {HORIZONS.map((h) => (
            <button
              key={h}
              type="button"
              className={h === horizon ? styles.segActive : undefined}
              aria-pressed={h === horizon}
              onClick={() => onHorizonChange(h)}
            >
              {h} мес
            </button>
          ))}
        </div>
      </div>
    </div>
  );

  // ── Pending / loading → calm skeleton (NOT an error) ─────────────────────────
  const report: ForecastReport | undefined =
    data?.status === "ready" ? data.report : undefined;
  const pending = isLoading || (!report && !error);

  if (pending) {
    return (
      <div className={styles.scenariosRoot}>
        {header}
        <div className={`${styles.panel} ${styles.forecastPending}`}>
          <div className={styles.pendingPulse} aria-hidden="true" />
          <div className={styles.pendingTitle}>Прогноз считается…</div>
          <p className={styles.pendingHint}>
            Сценарный прогноз §22 формируется в фоне после запуска анализа.
            Обычно занимает 1–2 минуты — обновится автоматически.
          </p>
        </div>
      </div>
    );
  }

  // ── Error / no report → honest empty panel ───────────────────────────────────
  if (error || !report) {
    return (
      <div className={styles.scenariosRoot}>
        {header}
        <div className={`${styles.panel} ${styles.emptyPanel}`}>
          Прогноз §22 недоступен для этого участка.
        </div>
      </div>
    );
  }

  const fm = report.future_market;
  const targetHorizon = horizon;

  return (
    <div className={styles.scenariosRoot}>
      {header}

      <ScenarioCards
        scenarios={report.scenarios}
        scenariosSummary={fm.scenarios_summary}
        targetHorizon={targetHorizon}
      />

      <HorizonForecast
        forecasts={fm.forecasts_by_horizon}
        targetHorizon={targetHorizon}
        segmentLabel={segmentLabel(report.meta.segment)}
      />

      <ScenarioCompareTable
        scenarios={report.scenarios}
        scenariosSummary={fm.scenarios_summary}
        targetHorizon={targetHorizon}
      />

      <div className={styles.sectionLabel}>
        6.3 · <b>уверенность</b> · 6.4 · <b>рекомендация по продукту</b>
      </div>
      <section className={styles.forecastGrid}>
        <ConfidencePanel confidence={report.confidence} />
        {report.product_tz ? (
          <RecommendedProduct
            productTz={report.product_tz}
            successScore={report.scoring?.overall ?? null}
            targetPrice={null}
          />
        ) : (
          <div className={`${styles.panel} ${styles.emptyPanel}`}>
            Рекомендация по продукту недоступна.
          </div>
        )}
      </section>

      {report.scoring && <ScoringTransparency scoring={report.scoring} />}
    </div>
  );
}