import { ANNEX_C } from "./annexc-data";
import { GroupId, GroupTable, ThirdPlaceRow } from "./types";

// Die festen Paarungen der Runde der letzten 32 (FIFA-Spielplan, Annex zur Auslosung).
// Quelle: FIFA WM 2026 Wettbewerbsregeln, Spiele 73-88.
// "W"=Sieger, "R"=Zweiter, "3"=bester Drittplatzierter (Gruppe per Annex C bestimmt).
export interface BracketSlot {
  type: "W" | "R" | "3";
  group?: GroupId;          // bei W/R: feste Gruppe
  thirdPool?: GroupId[];    // bei 3: mögliche Quellgruppen (Info / UI)
}

export interface R32Match {
  matchNumber: number;
  home: BracketSlot;
  away: BracketSlot;
}

// Die acht Gruppensieger, die einen Drittplatzierten bekommen — in der
// Spaltenreihenfolge von Annex C: 1A, 1B, 1D, 1E, 1G, 1I, 1K, 1L.
export const ANNEX_WINNER_ORDER: GroupId[] = ["A", "B", "D", "E", "G", "I", "K", "L"];

// Statische R32-Struktur. thirdPool dient nur der Anzeige vor Turnierende.
export const R32: R32Match[] = [
  { matchNumber: 73, home: { type: "R", group: "A" }, away: { type: "R", group: "B" } },
  { matchNumber: 74, home: { type: "W", group: "E" }, away: { type: "3", thirdPool: ["A","B","C","D","F"] } },
  { matchNumber: 75, home: { type: "W", group: "F" }, away: { type: "R", group: "C" } },
  { matchNumber: 76, home: { type: "W", group: "C" }, away: { type: "R", group: "F" } },
  { matchNumber: 77, home: { type: "W", group: "I" }, away: { type: "3", thirdPool: ["C","D","F","G","H"] } },
  { matchNumber: 78, home: { type: "R", group: "E" }, away: { type: "R", group: "I" } },
  { matchNumber: 79, home: { type: "W", group: "A" }, away: { type: "3", thirdPool: ["C","E","F","H","I"] } },
  { matchNumber: 80, home: { type: "W", group: "L" }, away: { type: "3", thirdPool: ["E","H","I","J","K"] } },
  { matchNumber: 81, home: { type: "W", group: "D" }, away: { type: "3", thirdPool: ["B","E","F","I","J"] } },
  { matchNumber: 82, home: { type: "W", group: "G" }, away: { type: "3", thirdPool: ["A","E","H","I","J"] } },
  { matchNumber: 83, home: { type: "R", group: "K" }, away: { type: "R", group: "L" } },
  { matchNumber: 84, home: { type: "W", group: "H" }, away: { type: "R", group: "J" } },
  { matchNumber: 85, home: { type: "W", group: "B" }, away: { type: "3", thirdPool: ["E","F","G","I","J"] } },
  { matchNumber: 86, home: { type: "W", group: "J" }, away: { type: "R", group: "H" } },
  { matchNumber: 87, home: { type: "W", group: "K" }, away: { type: "3", thirdPool: ["D","E","I","J","L"] } },
  { matchNumber: 88, home: { type: "R", group: "D" }, away: { type: "R", group: "G" } },
];

// Folgerunden: jedes Spiel speist sich aus zwei Vorspielen (FIFA-Spielplan).
export interface KnockoutMatch {
  matchNumber: number;
  stage: "R16" | "QF" | "SF" | "3RD" | "FINAL";
  fromHome: number;   // Match-Nr des Vorspiels (Sieger), bei 3RD: Verlierer
  fromAway: number;
  losers?: boolean;   // true beim Spiel um Platz 3
}

export const LATER_ROUNDS: KnockoutMatch[] = [
  { matchNumber: 89, stage: "R16", fromHome: 74, fromAway: 77 },
  { matchNumber: 90, stage: "R16", fromHome: 73, fromAway: 75 },
  { matchNumber: 91, stage: "R16", fromHome: 76, fromAway: 78 },
  { matchNumber: 92, stage: "R16", fromHome: 79, fromAway: 80 },
  { matchNumber: 93, stage: "R16", fromHome: 83, fromAway: 84 },
  { matchNumber: 94, stage: "R16", fromHome: 81, fromAway: 82 },
  { matchNumber: 95, stage: "R16", fromHome: 86, fromAway: 88 },
  { matchNumber: 96, stage: "R16", fromHome: 85, fromAway: 87 },
  { matchNumber: 97, stage: "QF", fromHome: 89, fromAway: 90 },
  { matchNumber: 98, stage: "QF", fromHome: 93, fromAway: 94 },
  { matchNumber: 99, stage: "QF", fromHome: 91, fromAway: 92 },
  { matchNumber: 100, stage: "QF", fromHome: 95, fromAway: 96 },
  { matchNumber: 101, stage: "SF", fromHome: 97, fromAway: 98 },
  { matchNumber: 102, stage: "SF", fromHome: 99, fromAway: 100 },
  { matchNumber: 103, stage: "3RD", fromHome: 101, fromAway: 102, losers: true },
  { matchNumber: 104, stage: "FINAL", fromHome: 101, fromAway: 102 },
];

// Ergebnis der Annex-C-Auflösung: pro Gruppensieger der zugeordnete Dritte.
export type ThirdAssignment = Partial<Record<GroupId, GroupId>>;

// Normalisiert die qualifizierten Gruppen zum Annex-C-Schlüssel (alphabetisch).
export function annexKey(qualifiedGroups: GroupId[]): string {
  return [...qualifiedGroups].sort().join("");
}

// Schlägt die Zuordnung in Annex C nach. Gibt {Gruppensieger -> 3.Gruppe} zurück.
// Liefert null, wenn nicht genau 8 Gruppen oder kein Treffer.
export function resolveAnnexC(qualifiedGroups: GroupId[]): ThirdAssignment | null {
  if (qualifiedGroups.length !== 8) return null;
  const key = annexKey(qualifiedGroups);
  const value = ANNEX_C[key];
  if (!value) return null;
  const assignment: ThirdAssignment = {};
  for (let i = 0; i < ANNEX_WINNER_ORDER.length; i++) {
    assignment[ANNEX_WINNER_ORDER[i]] = value[i] as GroupId;
  }
  return assignment;
}

// Bestimmt die qualifizierten Drittplatzierten-Gruppen aus der Tabelle.
export function qualifiedThirdGroups(thirds: ThirdPlaceRow[]): GroupId[] {
  return thirds.filter((t) => t.qualifies).map((t) => t.group);
}

// Hilfslabel für einen Slot, abhängig davon ob die Annex-C-Zuordnung schon feststeht.
export function slotLabel(
  slot: BracketSlot,
  assignment: ThirdAssignment | null,
  winnerGroupForThisMatch?: GroupId,
): string {
  if (slot.type === "W") return `Sieger ${slot.group}`;
  if (slot.type === "R") return `Zweiter ${slot.group}`;
  // 3. Platz
  if (assignment && winnerGroupForThisMatch && assignment[winnerGroupForThisMatch]) {
    return `3. der Gruppe ${assignment[winnerGroupForThisMatch]}`;
  }
  return `3. ${slot.thirdPool?.join("/") ?? "?"}`;
}