import { NextResponse } from "next/server";
import { fetchMatchesAndTeams, fetchOdds, attachOdds, attachKOOdds, fetchFifaScores, applyFifaScores, assignKONumbersBySlots } from "@/lib/feeds";
import { computeGroupTables, computeThirdPlaceTable } from "@/lib/standings";
import { qualifiedThirdGroups, resolveAnnexC } from "@/lib/bracket";
import { securelyQualifiedThirdTeams } from "@/lib/third-place-security";

// Diese Route wird vom Frontend gepollt. Sie ist der einzige Ort, der die
// Upstream-Feeds berührt — gecacht, damit Rate Limits eingehalten werden.
export const dynamic = "force-dynamic";

export async function GET() {
  try {
    const { matches: rawMatches, teams } = await fetchMatchesAndTeams();

    // Odds sind optional: fällt der Polymarket-Call aus, liefern wir trotzdem.
    let matches = rawMatches;
    let odds: Awaited<ReturnType<typeof fetchOdds>> | null = null;
    try {
      odds = await fetchOdds();
      matches = attachOdds(rawMatches, teams, odds);
    } catch (err) {
      console.error("[polymarket] fetchOdds fehlgeschlagen:", err);
    }

    // FIFA-Live-Scores (additiv, Fallback auf football-data)
    assignKONumbersBySlots(matches, teams);

    if (odds) {
      matches = attachKOOdds(matches, teams, odds);
    }

    try {
      const fifaData = await fetchFifaScores();
      matches = applyFifaScores(matches, teams, fifaData);
    } catch (err) {
      console.warn("[fifa] Scores fehlgeschlagen:", err instanceof Error ? err.message : err);
    }

    const groupTables = computeGroupTables(teams, matches);
    const groupTablesLive = computeGroupTables(teams, matches, true);

    const normalizedMatches = matches.map((m) => ({ ...m, prob: m.prob ?? null }));

    const thirdTable = computeThirdPlaceTable(groupTablesLive);
    const qGroups = qualifiedThirdGroups(thirdTable);
    const annex = qGroups.length === 8 ? resolveAnnexC(qGroups) : null;

    // Sichere Drittplatzierte (Team-IDs, deren Top-8-Platz mathematisch feststeht)
    const secureThirdTeams = securelyQualifiedThirdTeams(matches, teams);

    return NextResponse.json({
      updatedAt: new Date().toISOString(),
      teams,
      matches: normalizedMatches,
      groupTables,
      groupTablesLive,
      thirdTable,
      secureThirdTeams: [...secureThirdTeams],
      annexAssignment: annex,
      annexResolved: annex != null,
    });
  } catch (err) {
    const message = err instanceof Error ? err.message : "unbekannter Fehler";
    return NextResponse.json(
      { error: "Feed nicht erreichbar", detail: message },
      { status: 502 },
    );
  }
}