// Shared interfaces and utilities for ESPN standings API adapters.
// Used by MLB, NBA, WNBA, and MLS adapters.

export interface EspnStat {
  name: string;
  displayName?: string;
  shortDisplayName?: string;
  description?: string;
  abbreviation?: string;
  type?: string;
  value?: number;
  displayValue?: string;
}

export interface EspnTeam {
  id: string;
  displayName: string;
  shortDisplayName?: string;
  abbreviation?: string;
  location?: string;
  name?: string;
}

export interface EspnStandingsEntry {
  team: EspnTeam;
  stats: EspnStat[];
}

export interface EspnStandingsGroup {
  name?: string;
  standings?: { entries?: EspnStandingsEntry[] };
  children?: EspnStandingsGroup[];
}

export interface EspnStandingsResponse {
  children?: EspnStandingsGroup[];
}

export function statsMap(stats: EspnStat[]): Map<string, EspnStat> {
  const map = new Map<string, EspnStat>();
  for (const stat of stats) map.set(stat.name, stat);
  return map;
}

/**
 * Flatten an ESPN standings response into individual entries with their
 * conference and division context.
 *
 * Handles two layouts ESPN uses:
 * - conf → div → entries (NBA, MLB): division name is populated
 * - conf → entries (flat conferences): division is ""
 */
export function flattenEspnStandings(
  response: EspnStandingsResponse
): Array<{ entry: EspnStandingsEntry; conference: string; division: string }> {
  const results: Array<{ entry: EspnStandingsEntry; conference: string; division: string }> = [];

  for (const confGroup of response.children ?? []) {
    const conferenceName = confGroup.name ?? "";

    if (confGroup.children && confGroup.children.length > 0) {
      for (const divGroup of confGroup.children) {
        const divisionName = divGroup.name ?? "";
        for (const entry of divGroup.standings?.entries ?? []) {
          results.push({ entry, conference: conferenceName, division: divisionName });
        }
      }
    } else {
      for (const entry of confGroup.standings?.entries ?? []) {
        results.push({ entry, conference: conferenceName, division: "" });
      }
    }
  }

  return results;
}

/**
 * Extract the playoffSeed stat as a conference rank integer, or undefined if absent.
 * Only meaningful for team sports that use playoff seeding (MLB, NBA, WNBA).
 */
export function parseConferenceRank(sm: Map<string, EspnStat>): number | undefined {
  const stat = sm.get("playoffSeed");
  if (stat?.value !== undefined && stat.value !== null) return Math.round(stat.value);
  if (stat?.displayValue) {
    const parsed = parseInt(stat.displayValue, 10);
    return isNaN(parsed) ? undefined : parsed;
  }
  return undefined;
}

/**
 * Sort comparator for ESPN win-loss standings: wins descending, losses ascending,
 * alphabetical by team name as a stable tiebreaker.
 */
export function sortByWinLoss(
  a: { sm: Map<string, EspnStat>; entry: EspnStandingsEntry },
  b: { sm: Map<string, EspnStat>; entry: EspnStandingsEntry }
): number {
  const winsA = a.sm.get("wins")?.value ?? 0;
  const winsB = b.sm.get("wins")?.value ?? 0;
  if (winsB !== winsA) return winsB - winsA;
  const lossA = a.sm.get("losses")?.value ?? 0;
  const lossB = b.sm.get("losses")?.value ?? 0;
  if (lossA !== lossB) return lossA - lossB;
  return a.entry.team.displayName.localeCompare(b.entry.team.displayName);
}