import { Suspense } from "react";
import { notFound } from "next/navigation";
import { AiAnalysisCard } from "@/components/ai-analysis-card";
import { ElevationChart } from "@/components/elevation-chart";
import { RouteMapSection } from "@/components/route-map-section";
import { GcbChart } from "@/components/gcb-chart";
import { RunMetricChart } from "@/components/run-metric-chart";
import { StatCard } from "@/components/stat-card";
import { formatDate, formatDistance, formatDuration, formatPace } from "@/lib/format";
import {
  fetchActivityRoutePoints,
  fetchActivityRunMetrics,
  getAuthorizedClient,
} from "@/lib/garmin/client";
import { getLatestAnalysisForTarget, serializeAnalysis } from "@/lib/models/analysis";
import {
  getRunningActivity,
  setRunningActivityMetrics,
  setRunningActivityRoutePoints,
  type RunMetrics,
  type RunningActivity,
} from "@/lib/models/running";
import { getCurrentUserId } from "@/lib/session";

export const dynamic = "force-dynamic";

function mayHaveRoute(activity: RunningActivity): boolean {
  return Boolean(activity.hasRoute) || Boolean(activity.routePoints?.length);
}

async function RouteMapFetcher({
  activity,
  userId,
}: {
  activity: RunningActivity;
  userId: string;
}) {
  let routePoints = activity.routePoints;

  if ((!routePoints || !activity.elevationProfile) && mayHaveRoute(activity)) {
    try {
      const client = await getAuthorizedClient(userId);
      const result = await fetchActivityRoutePoints(client, activity.garminActivityId);
      if (result) {
        await setRunningActivityRoutePoints(userId, activity.garminActivityId, result.points, result.elevationProfile);
        routePoints = result.points;
      }
    } catch {
      // GPS fetch failed silently
    }
  }

  return (
    <div className="col-span-2 row-span-3 min-h-[240px] overflow-hidden rounded-lg border border-muted/40">
      {routePoints && routePoints.length > 0 ? (
        <RouteMapSection points={routePoints} />
      ) : (
        <div className="flex h-full min-h-[240px] items-center justify-center bg-surface">
          <span className="text-sm text-fg/30">Brak danych GPS</span>
        </div>
      )}
    </div>
  );
}

function hasValidElevation(profile: number[] | undefined): boolean {
  return Array.isArray(profile) && profile.some((v) => v > 0);
}

async function ElevationFetcher({
  activity,
  userId,
}: {
  activity: RunningActivity;
  userId: string;
}) {
  let elevationProfile = activity.elevationProfile;

  if (!hasValidElevation(elevationProfile) && mayHaveRoute(activity)) {
    try {
      const client = await getAuthorizedClient(userId);
      const result = await fetchActivityRoutePoints(client, activity.garminActivityId);
      if (result) {
        await setRunningActivityRoutePoints(userId, activity.garminActivityId, result.points, result.elevationProfile);
        elevationProfile = result.elevationProfile;
      }
    } catch {
      // silent
    }
  }

  if (!elevationProfile || elevationProfile.length < 2) return null;

  const elevData = elevationProfile
    .map((altM, i) => ({
      distanceKm: Math.round((i / elevationProfile!.length) * activity.distanceM / 10) / 100,
      altM,
    }))
    .filter((p) => p.altM > 0);

  if (elevData.length < 2) return null;

  // Merge pace by fractional position (both arrays span the same run, different sample counts)
  const paceSrc = activity.runMetrics?.paceSec;
  const data = elevData.map((ep, i) => {
    if (!paceSrc || paceSrc.length === 0) return ep;
    const pi = Math.min(Math.round((i / elevData.length) * paceSrc.length), paceSrc.length - 1);
    const v = paceSrc[pi];
    return { ...ep, paceSec: v > 0 && v < 1800 ? v : undefined };
  });

  return <ElevationChart data={data} />;
}

function toChartData(
  values: number[] | undefined,
  distances: number[]
): { distanceKm: number; value: number }[] {
  if (!values) return [];
  return distances
    .map((distanceKm, i) => ({ distanceKm, value: values[i] ?? 0 }))
    .filter((p) => p.value > 0);
}

async function RunMetricsFetcher({
  activity,
  userId,
}: {
  activity: RunningActivity;
  userId: string;
}) {
  let metrics: RunMetrics | undefined = activity.runMetrics;

  const missingCadence = activity.avgCadence && !metrics?.cadenceSpm;
  const missingGcb = activity.avgGroundContactBalanceLeftPct && !metrics?.gcbLeftPct;
  // Re-fetch if paceSec missing or was computed from integer-rounded speeds (< 15 unique values = rounding artifact)
  const validPace = metrics?.paceSec?.filter((v) => v > 0) ?? [];
  const missingPace = validPace.length === 0 || new Set(validPace).size < 15;

  if ((!metrics || missingCadence || missingGcb || missingPace) && mayHaveRoute(activity)) {
    try {
      const client = await getAuthorizedClient(userId);
      const fetched = await fetchActivityRunMetrics(client, activity.garminActivityId);
      if (fetched) {
        await setRunningActivityMetrics(userId, activity.garminActivityId, fetched);
        metrics = fetched;
      }
    } catch {
      // silent
    }
  }

  if (!metrics || metrics.distanceKm.length === 0) return null;

  const { hrBpm, gcbLeftPct } = metrics;

  const maxDist = Math.max(...metrics.distanceKm);
  const distanceKm =
    maxDist > 0
      ? metrics.distanceKm
      : Array.from({ length: metrics.distanceKm.length }, (_, i) =>
          Math.round(((i / (metrics.distanceKm.length - 1)) * activity.distanceM) / 10) / 100
        );

  const hrData = toChartData(hrBpm, distanceKm);
  const gcbData = gcbLeftPct
    ? distanceKm
        .map((d, i) => {
          const left = gcbLeftPct[i] ?? 0;
          return left > 0
            ? { distanceKm: d, left, right: Math.round((100 - left) * 10) / 10 }
            : null;
        })
        .filter((p): p is NonNullable<typeof p> => p !== null)
    : [];

  if (!hrData.length && !gcbData.length) return null;

  return (
    <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
      {hrData.length > 1 && (
        <RunMetricChart data={hrData} label="Tętno" unit="bpm" color="var(--color-accent)" />
      )}
      {gcbData.length > 1 && <GcbChart data={gcbData} />}
    </div>
  );
}

function MapSkeleton() {
  return (
    <div className="col-span-2 row-span-3 min-h-[240px] animate-pulse overflow-hidden rounded-lg border border-muted/40 bg-surface" />
  );
}

export default async function RunningActivityPage({
  params,
}: {
  params: Promise<{ id: string }>;
}) {
  const { id } = await params;
  const userId = await getCurrentUserId();
  const activity = await getRunningActivity(userId, id);

  if (!activity) {
    notFound();
  }

  const analysis = await getLatestAnalysisForTarget(userId, "running", activity._id);

  return (
    <div className="flex flex-col gap-6">
      <div>
        <h1 className="text-2xl font-bold text-fg">{activity.name}</h1>
        <p className="mt-1 text-sm text-fg/60">{formatDate(activity.startTime)}</p>
      </div>

      <section className="grid grid-cols-3 gap-4">
        <Suspense fallback={<MapSkeleton />}>
          <RouteMapFetcher activity={activity} userId={userId} />
        </Suspense>

        <StatCard highlight label="Dystans" value={formatDistance(activity.distanceM)} />
        <StatCard highlight label="Czas" value={formatDuration(activity.durationSec)} />
        <StatCard highlight label="Tempo" value={formatPace(activity.avgPaceSecPerKm)} />

        <StatCard highlight label="Średnie HR" value={activity.avgHr ? `${Math.round(activity.avgHr)} bpm` : "—"} />
        <StatCard highlight label="Kalorie" value={activity.calories ? `${Math.round(activity.calories)} kcal` : "—"} />
        <StatCard highlight label="Kadencja" value={activity.avgCadence ? `${Math.round(activity.avgCadence)} kr/min` : "—"} />

        {activity.maxHr ? <StatCard label="Maks. HR" value={`${Math.round(activity.maxHr)} bpm`} /> : null}
        {activity.elevationGainM ? <StatCard label="Podejście" value={`${Math.round(activity.elevationGainM)} m`} /> : null}
        {activity.vo2Max ? <StatCard label="VO2max" value={`${Math.round(activity.vo2Max)}`} /> : null}
        {activity.avgGroundContactTimeMs ? (
          <StatCard label="Czas kontaktu z podłożem" value={`${Math.round(activity.avgGroundContactTimeMs)} ms`} />
        ) : null}
        {activity.avgVerticalOscillationCm ? (
          <StatCard label="Oscylacja wertykalna" value={`${activity.avgVerticalOscillationCm.toFixed(1)} cm`} />
        ) : null}
        {activity.avgVerticalRatioPct ? (
          <StatCard label="Wskaźnik wertykalny" value={`${activity.avgVerticalRatioPct.toFixed(1)}%`} />
        ) : null}
        {activity.avgStrideLengthCm ? (
          <StatCard label="Długość kroku" value={`${activity.avgStrideLengthCm.toFixed(0)} cm`} />
        ) : null}
        {activity.avgGroundContactBalanceLeftPct ? (
          <StatCard
            label="Balans kontaktu (L/P)"
            value={`${activity.avgGroundContactBalanceLeftPct.toFixed(1)}% / ${(100 - activity.avgGroundContactBalanceLeftPct).toFixed(1)}%`}
          />
        ) : null}
        {activity.avgPowerW ? <StatCard label="Moc średnia" value={`${Math.round(activity.avgPowerW)} W`} /> : null}
        {activity.maxPowerW ? <StatCard label="Moc maks." value={`${Math.round(activity.maxPowerW)} W`} /> : null}
        {activity.avgRespirationRate ? (
          <StatCard label="Częstość oddechów" value={`${activity.avgRespirationRate.toFixed(1)} /min`} />
        ) : null}
        {activity.aerobicTrainingEffect ? (
          <StatCard label="Efekt aerobowy" value={activity.aerobicTrainingEffect.toFixed(1)} />
        ) : null}
        {activity.anaerobicTrainingEffect ? (
          <StatCard label="Efekt anaerobowy" value={activity.anaerobicTrainingEffect.toFixed(1)} />
        ) : null}
      </section>

      <Suspense fallback={null}>
        <ElevationFetcher activity={activity} userId={userId} />
      </Suspense>

      <Suspense fallback={null}>
        <RunMetricsFetcher activity={activity} userId={userId} />
      </Suspense>

      <AiAnalysisCard
        targetType="running"
        targetId={activity._id.toString()}
        analysis={analysis ? serializeAnalysis(analysis) : null}
      />
    </div>
  );
}