import { useQuery } from '@tanstack/react-query';
import { Link, useSearchParams } from 'react-router-dom';
import { ReportHero, ReportPanel, SignalMetric, reportActionPrimary } from '../components/report/ReportPrimitives';
import { TraceExplorer } from '../components/trace/TraceExplorer';
import { StatusBadge } from '../components/ui/Card';
import { api, type HarnessRunRecord } from '../lib/api';

const integer = (value: number): string => new Intl.NumberFormat('en-US').format(value);

export function Runs() {
  const { data, isLoading, isError } = useQuery({ queryKey: ['runs'], queryFn: () => api.runs(100) });
  const [searchParams, setSearchParams] = useSearchParams();
  const selectedTrace = searchParams.get('trace') ?? '';
  const runs = data?.runs ?? [];
  const failures = runs.filter((run) => run.status === 'failed').length;
  const attributedCost = runs.filter((run) => run.cost_estimate != null).length;
  const latencyValues = runs.map((run) => Number(run.latency_ms)).filter((value) => Number.isFinite(value) && value > 0);
  const averageLatency = latencyValues.length > 0
    ? Math.round(latencyValues.reduce((sum, value) => sum + value, 0) / latencyValues.length)
    : null;

  return (
    <div className="space-y-5">
      <ReportHero
        eyebrow="Run assurance registry"
        title="Every governed run, one evidence trail."
        description="Select a lifecycle record to reconstruct H1–H7 decisions, inspect sanitized evidence and export an independent assurance dossier."
        verdict={failures > 0 ? 'attention' : data ? 'operational' : undefined}
        meta={data ? (
          <>
            <span>{data.count} records in current registry</span>
            <span>{failures} failures</span>
            <span>{attributedCost}/{runs.length} cost-attributed</span>
          </>
        ) : <span>Loading governed run registry…</span>}
        actions={<Link to="/reports/h6" className={reportActionPrimary}>Open H6 dossier</Link>}
      />

      {selectedTrace && <TraceExplorer traceId={selectedTrace} onClose={() => setSearchParams({})} />}

      {isLoading && (
        <div className="grid gap-4 sm:grid-cols-2 xl:grid-cols-4">
          {Array.from({ length: 4 }, (_, index) => <div key={index} className="h-32 animate-pulse rounded-2xl bg-slate-200" />)}
        </div>
      )}
      {isError && <div role="alert" className="rounded-2xl border border-rose-200 bg-rose-50 p-5 text-sm text-rose-800">The governed run registry could not be loaded.</div>}

      {data && (
        <>
          <section className="grid gap-4 sm:grid-cols-2 xl:grid-cols-4">
            <SignalMetric label="Governed records" value={integer(data.count)} detail="Latest 100 lifecycle records" tone="info" />
            <SignalMetric label="Failures" value={integer(failures)} detail={`${data.count ? Math.round((failures / data.count) * 100) : 0}% observed failure rate`} tone={failures > 0 ? 'danger' : 'success'} />
            <SignalMetric label="Average latency" value={averageLatency === null ? 'Unavailable' : `${integer(averageLatency)} ms`} detail={`${latencyValues.length}/${runs.length} records measured`} tone="neutral" />
            <SignalMetric label="Cost attribution" value={`${runs.length ? Math.round((attributedCost / runs.length) * 100) : 0}%`} detail={`${attributedCost}/${runs.length} records`} tone={attributedCost === runs.length && runs.length > 0 ? 'success' : 'warning'} />
          </section>

          <ReportPanel
            eyebrow="Evidence index"
            title="Recent governed runs"
            description="Operational values are shown only when present in canonical telemetry. Select a trace to open the evidence spine."
            right={<span className="text-xs text-slate-400">{data.count} total records</span>}
          >
            <div className="-mx-5 overflow-x-auto sm:-mx-6">
              <table className="w-full min-w-[900px] text-sm">
                <thead>
                  <tr className="border-y border-slate-100 bg-slate-50 text-left text-[10px] font-black uppercase tracking-[0.12em] text-slate-500">
                    <th className="px-5 py-3 sm:pl-6">Observed at</th>
                    <th className="px-3 py-3">Lifecycle step</th>
                    <th className="px-3 py-3">Verdict</th>
                    <th className="px-3 py-3 text-right">Latency</th>
                    <th className="px-3 py-3 text-right">Tokens</th>
                    <th className="px-3 py-3 text-right">Cost</th>
                    <th className="px-5 py-3 text-right sm:pr-6">Evidence</th>
                  </tr>
                </thead>
                <tbody>
                  {runs.map((run: HarnessRunRecord, index: number) => (
                    <tr key={`${run.trace_id ?? 'run'}-${index}`} className="border-b border-slate-100 transition-colors last:border-0 hover:bg-cyan-50/30">
                      <td className="whitespace-nowrap px-5 py-4 font-mono text-[11px] text-slate-500 sm:pl-6">{run.timestamp?.replace('T', ' ').replace('Z', ' UTC') ?? 'Unavailable'}</td>
                      <td className="px-3 py-4 font-semibold text-slate-900">{run.step ?? run.harness}</td>
                      <td className="px-3 py-4"><StatusBadge value={run.status ?? 'unknown'} /></td>
                      <td className="px-3 py-4 text-right font-mono text-xs text-slate-600">{run.latency_ms == null ? 'Unavailable' : `${integer(Number(run.latency_ms))} ms`}</td>
                      <td className="px-3 py-4 text-right font-mono text-xs text-slate-600">{run.total_tokens ?? 'Unavailable'}</td>
                      <td className="px-3 py-4 text-right font-mono text-xs text-slate-600">{run.cost_estimate == null ? <span className="font-sans text-amber-700">Unavailable</span> : `$${Number(run.cost_estimate).toFixed(5)}`}</td>
                      <td className="px-5 py-4 text-right sm:pr-6">
                        {run.trace_id ? (
                          <button
                            type="button"
                            onClick={() => {
                              setSearchParams({ trace: run.trace_id ?? '' });
                              window.scrollTo({ top: 0, behavior: 'smooth' });
                            }}
                            className="min-h-11 rounded-xl border border-slate-300 bg-white px-4 py-2 text-xs font-bold text-slate-700 transition hover:-translate-y-px hover:border-cyan-400 hover:text-cyan-800 focus:outline-none focus:ring-4 focus:ring-cyan-100"
                          >
                            Inspect H1–H7
                          </button>
                        ) : <span className="text-slate-300">—</span>}
                      </td>
                    </tr>
                  ))}
                  {runs.length === 0 && (
                    <tr>
                      <td colSpan={7} className="px-6 py-16 text-center text-sm text-slate-500">No governed run has been recorded yet.</td>
                    </tr>
                  )}
                </tbody>
              </table>
            </div>
          </ReportPanel>
        </>
      )}
    </div>
  );
}