"use client";

/**
 * Section4Estimate — "2. Оценка участка"
 *
 * Layout:
 *   HeadlineBar (score + verdict label as title)
 *   GateVerdictBanner (conditional — gate_verdict field)
 *   2-col grid (desktop):
 *     left: ScoreBreakdownPanel (top-3 plus/minus + by-group bar)
 *     right: ScoreBreakdownStackedBar (per-category contribution)
 *   Geology / Hydrology / GeotechRisk blocks (conditional — each field)
 *   NspdZouitOverlapsBlock (conditional — nspd_zouit_overlaps present)
 *   SuccessRecommendationBlock (conditional — success_recommendation present)
 *
 * Data: useParcelAnalyzeQuery (canonical) from @/lib/site-finder-api.
 * All sections are conditional — graceful if backend field is absent.
 */

import { HeadlineBar } from "@/components/ui/HeadlineBar";
import { ScoreBreakdownPanel } from "@/components/site-finder/ScoreBreakdownPanel";
import { ScoreBreakdownStackedBar } from "@/components/site-finder/ScoreBreakdownStackedBar";
import { GeologyBlock } from "@/components/site-finder/GeologyBlock";
import { HydrologyBlock } from "@/components/site-finder/HydrologyBlock";
import { GeotechRiskBlock } from "@/components/site-finder/GeotechRiskBlock";
import { NspdZouitOverlapsBlock } from "@/components/site-finder/NspdZouitOverlapsBlock";
import { SuccessRecommendationBlock } from "@/components/site-finder/SuccessRecommendationBlock";
import { useParcelAnalyzeQuery } from "@/lib/site-finder-api";
import type { ParcelAnalysis } from "@/types/site-finder";
import type { FactorContribution, ScoreGroupTotal } from "@/types/site-finder";

// ── Props ─────────────────────────────────────────────────────────────────────

interface Props {
  cad: string;
}

// ── Helpers ───────────────────────────────────────────────────────────────────

function buildHeadlineTitle(analysis: ParcelAnalysis): string {
  // Guard: a 202 on-demand-fetch stub (#1001) has no `score` — render "—"
  // instead of throwing on `.toFixed` against undefined.
  const score =
    typeof analysis.score === "number" && Number.isFinite(analysis.score)
      ? analysis.score.toFixed(1)
      : "—";
  const label = analysis.score_label ?? "";
  if (label) {
    return `Оценка: ${score} · ${label.toUpperCase()}`;
  }
  return `Оценка: ${score}`;
}

function buildHeadlineSubtitle(analysis: ParcelAnalysis): string | undefined {
  const parts: string[] = [];

  if (analysis.gate_verdict) {
    parts.push(`МКД: ${analysis.gate_verdict.verdict_label}`);
  }

  if (analysis.score_explanation) {
    parts.push(analysis.score_explanation);
  } else if (analysis.confidence_label) {
    parts.push(`Уверенность данных: ${analysis.confidence_label}`);
  }

  return parts.length > 0 ? parts.join(" · ") : undefined;
}

// ── Section 4 skeleton (loading) ──────────────────────────────────────────────

function Section4Skeleton() {
  return (
    <section id="section-4" style={{ scrollMarginTop: 72 }}>
      <div
        style={{
          background: "var(--bg-headline)",
          borderRadius: 12,
          padding: "14px 18px",
          marginBottom: 12,
        }}
      >
        <div
          style={{
            height: 20,
            width: "40%",
            background: "rgba(255,255,255,0.1)",
            borderRadius: 4,
          }}
        />
      </div>
      <div
        style={{
          height: 120,
          background: "var(--bg-card-alt)",
          border: "1px solid var(--border-soft)",
          borderRadius: 12,
        }}
      />
    </section>
  );
}

// ── Main component ────────────────────────────────────────────────────────────

export function Section4Estimate({ cad }: Props) {
  const { data, isLoading, error } = useParcelAnalyzeQuery(cad);

  if (isLoading) {
    return <Section4Skeleton />;
  }

  if (error || !data) {
    return (
      <section
        id="section-4"
        style={{
          scrollMarginTop: 72,
          padding: "16px 20px",
          background: "var(--danger-soft, #FEE2E2)",
          border: "1px solid var(--danger, #B3261E)",
          borderRadius: 12,
          color: "var(--danger, #B3261E)",
          fontSize: 13,
        }}
      >
        {error instanceof Error
          ? error.message
          : "Ошибка загрузки секции Оценка"}
      </section>
    );
  }

  // Cast to ParcelAnalysis which is the richer superset type with all optional fields.
  const analysis = data as unknown as ParcelAnalysis;

  const headlineTitle = buildHeadlineTitle(analysis);
  const headlineSubtitle = buildHeadlineSubtitle(analysis);

  // Breakdown data — may be absent on older backend deploys
  const topPositives: FactorContribution[] =
    analysis.score_top_3_positives ?? [];
  const topNegatives: FactorContribution[] =
    analysis.score_top_3_negatives ?? [];
  const byGroup: ScoreGroupTotal[] = analysis.score_by_group ?? [];
  const detailed: FactorContribution[] =
    analysis.score_breakdown_detailed ?? [];

  const hasBreakdown =
    topPositives.length > 0 ||
    topNegatives.length > 0 ||
    byGroup.length > 0 ||
    detailed.length > 0;

  const hasStackedBar = detailed.length > 0;

  const hasZouit =
    analysis.nspd_zouit_overlaps !== undefined &&
    analysis.nspd_zouit_overlaps !== null;

  return (
    <section id="section-4" style={{ scrollMarginTop: 72 }}>
      {/* ── Headline bar ─────────────────────────────────────────────────── */}
      <div style={{ marginBottom: 12 }}>
        <HeadlineBar title={headlineTitle} subtitle={headlineSubtitle} />
      </div>

      {/* Gate verdict banner перенесён НАД группой «Участок» (AnalysisPageContent, #1741) */}

      {/* ── Score breakdown: 2-col on desktop ───────────────────────────── */}
      {hasBreakdown && (
        <div
          style={{
            display: "grid",
            gridTemplateColumns: hasStackedBar ? "1fr 1fr" : "1fr",
            gap: 12,
            marginBottom: 12,
          }}
        >
          <ScoreBreakdownPanel
            topPositives={topPositives}
            topNegatives={topNegatives}
            byGroup={byGroup}
            detailed={detailed}
          />
          {hasStackedBar && <ScoreBreakdownStackedBar breakdown={detailed} />}
        </div>
      )}

      {/* ── Risk blocks grid ─────────────────────────────────────────────── */}
      {(analysis.geology || analysis.hydrology || analysis.geotech_risk) && (
        <div
          style={{
            display: "grid",
            gridTemplateColumns: "repeat(auto-fit, minmax(220px, 1fr))",
            gap: 12,
            marginBottom: 12,
          }}
        >
          {analysis.geology && <GeologyBlock geology={analysis.geology} />}
          {analysis.hydrology && (
            <HydrologyBlock hydrology={analysis.hydrology} />
          )}
          {analysis.geotech_risk && (
            <GeotechRiskBlock risk={analysis.geotech_risk} />
          )}
        </div>
      )}

      {/* ── NSPD ZOUIT overlaps ──────────────────────────────────────────── */}
      {hasZouit && (
        <div
          style={{
            background: "var(--bg-card)",
            border: "1px solid var(--border-card)",
            borderRadius: 12,
            padding: "16px 20px",
            marginBottom: 12,
          }}
        >
          <div
            title="Зоны с особыми условиями использования территорий — охранные зоны инженерной инфраструктуры (ЛЭП, газопровод и т.д.)"
            style={{
              fontSize: 12,
              fontWeight: 600,
              color: "var(--fg-secondary)",
              textTransform: "uppercase",
              letterSpacing: "0.04em",
              marginBottom: 10,
            }}
          >
            Охранные зоны ЗОУИТ
          </div>
          <NspdZouitOverlapsBlock
            overlaps={analysis.nspd_zouit_overlaps ?? []}
          />
        </div>
      )}

      {/* ── Success recommendation ───────────────────────────────────────── */}
      {analysis.success_recommendation !== undefined && (
        <div
          style={{
            background: "var(--bg-card)",
            border: "1px solid var(--border-card)",
            borderRadius: 12,
            padding: "16px 20px",
          }}
        >
          <SuccessRecommendationBlock
            recommendation={analysis.success_recommendation}
          />
        </div>
      )}
    </section>
  );
}
