/**
 * Rankings Page (SSR)
 * Display top-ranked schools by various metrics
 */

import { fetchRankings, fetchFilters, fetchMetrics } from '@/lib/api';
import { RankingsView } from '@/components/RankingsView';
import { absoluteUrl } from '@/lib/site';
import type { Metadata } from 'next';

interface RankingsPageProps {
  searchParams: Promise<{
    metric?: string;
    local_authority?: string;
    year?: string;
    phase?: string;
  }>;
}

export const metadata: Metadata = {
  // 'School Rankings' matched nothing anyone types. League tables is the
  // phrase parents actually search, and it spikes each results day.
  title: { absolute: 'Primary & Secondary School League Tables | schoolcompare' },
  description:
    'Rank English schools by SATs results, GCSEs, Progress 8 or Attainment 8, and filter by local authority or year. Built from the DfE’s own figures.',
  keywords: 'school rankings, top schools, best schools, KS2 rankings, KS4 rankings, school league tables',
  // Param forms (?metric=&local_authority=&year=&phase=) collapse here for
  // now. W3 replaces them with real indexable paths.
  alternates: { canonical: absoluteUrl('/rankings') },
};

// Dynamic via searchParams; remove force-dynamic so internal data fetches
// can still use Next.js's per-call revalidate cache.

export default async function RankingsPage({ searchParams }: RankingsPageProps) {
  const { metric: metricParam, local_authority, year: yearParam, phase: phaseParam } = await searchParams;

  const phase = phaseParam || 'primary';
  const metric = metricParam || (phase === 'secondary' ? 'attainment_8_score' : 'rwm_expected_pct');
  const year = yearParam ? parseInt(yearParam) : undefined;

  // Fetch rankings data with error handling
  try {
    const [rankingsResponse, filtersResponse, metricsResponse] = await Promise.all([
      fetchRankings({
        metric,
        local_authority,
        year,
        limit: 100,
        phase,
      }),
      fetchFilters(),
      fetchMetrics(),
    ]);

    // Metrics is already an array
    const metricsArray = metricsResponse?.metrics || [];

    return (
      <RankingsView
        rankings={rankingsResponse?.rankings || []}
        filters={filtersResponse || { local_authorities: [], school_types: [], years: [], phases: [], genders: [], admissions_policies: [] }}
        metrics={metricsArray}
        selectedMetric={metric}
        selectedArea={local_authority}
        selectedYear={year}
        selectedPhase={phase}
      />
    );
  } catch (error) {
    console.error('Error fetching data for rankings page:', error);

    // Return error state with empty data
    return (
      <RankingsView
        rankings={[]}
        filters={{ local_authorities: [], school_types: [], years: [], phases: [], genders: [], admissions_policies: [] }}
        metrics={[]}
        selectedMetric={metric}
        selectedArea={local_authority}
        selectedYear={year}
        selectedPhase={phase}
      />
    );
  }
}