/**
 * Website-local racing façade
 *
 * This module provides synchronous helper functions used by the alpha website
 * without depending on legacy exports from @gridpilot/racing/application.
 * It maintains simple in-memory state for memberships, teams, and registrations.
 */

import type {
  LeagueMembership as DomainLeagueMembership,
  MembershipRole,
  MembershipStatus,
} from '@gridpilot/racing/domain/entities/LeagueMembership';
import { getDriverAvatar, getTeamLogo, getLeagueBanner, memberships as seedMemberships, leagues as seedLeagues } from '@gridpilot/testing-support';

export type { MembershipRole, MembershipStatus };

export interface LeagueMembership extends Omit<DomainLeagueMembership, 'joinedAt'> {
  joinedAt: string;
}

// Lightweight league join request model for the website
export interface JoinRequest {
  id: string;
  leagueId: string;
  driverId: string;
  message?: string;
  requestedAt: string;
}

import type {
  Team,
  TeamJoinRequest,
  TeamMembership,
  TeamRole,
  TeamMembershipStatus,
} from '@gridpilot/racing/domain/entities/Team';

export type { Team, TeamJoinRequest, TeamMembership, TeamRole, TeamMembershipStatus };

/**
 * Identity helpers
 *
 * For the alpha website we treat a single demo driver as the "current" user.
 */
const CURRENT_DRIVER_ID = 'driver-1';

export function getCurrentDriverId(): string {
  return CURRENT_DRIVER_ID;
}

/**
 * In-memory stores
 */

const leagueMemberships = new Map<string, LeagueMembership[]>();
const leagueJoinRequests = new Map<string, JoinRequest[]>();

const teams = new Map<string, Team>();
const teamMemberships = new Map<string, TeamMembership[]>();
const teamJoinRequests = new Map<string, TeamJoinRequest[]>();

const raceRegistrations = new Map<string, Set<string>>();

/**
 * Helper utilities
 */

function ensureLeagueMembershipArray(leagueId: string): LeagueMembership[] {
  let list = leagueMemberships.get(leagueId);
  if (!list) {
    list = [];
    leagueMemberships.set(leagueId, list);
  }
  return list;
}

function ensureTeamMembershipArray(teamId: string): TeamMembership[] {
  let list = teamMemberships.get(teamId);
  if (!list) {
    list = [];
    teamMemberships.set(teamId, list);
  }
  return list;
}

function ensureRaceRegistrationSet(raceId: string): Set<string> {
  let set = raceRegistrations.get(raceId);
  if (!set) {
    set = new Set<string>();
    raceRegistrations.set(raceId, set);
  }
  return set;
}

let idCounter = 1;
function generateId(prefix: string): string {
  return `${prefix}-${idCounter++}`;
}

// Initialize league memberships from static seed data
(function initializeLeagueMembershipsFromSeed() {
  if (leagueMemberships.size > 0) {
    return;
  }

  const membershipsByLeague = new Map<string, LeagueMembership[]>();

  // Create base active memberships from seed
  for (const membership of seedMemberships) {
    const list = membershipsByLeague.get(membership.leagueId) ?? [];
    const joinedAt = new Date(2024, 0, 1 + (idCounter % 28)).toISOString();

    list.push({
      leagueId: membership.leagueId,
      driverId: membership.driverId,
      role: 'member',
      status: 'active',
      joinedAt,
    });

    membershipsByLeague.set(membership.leagueId, list);
  }

  // Ensure league owners are represented as owners in memberships
  for (const league of seedLeagues) {
    const list = membershipsByLeague.get(league.id) ?? [];
    const existingOwnerMembership = list.find((m) => m.driverId === league.ownerId);

    if (existingOwnerMembership) {
      existingOwnerMembership.role = 'owner';
    } else {
      const joinedAt = new Date(2024, 0, 1 + (idCounter % 28)).toISOString();
      list.unshift({
        leagueId: league.id,
        driverId: league.ownerId,
        role: 'owner',
        status: 'active',
        joinedAt,
      });
    }

    membershipsByLeague.set(league.id, list);
  }

  // Store into facade-local maps
  for (const [leagueId, list] of membershipsByLeague.entries()) {
    leagueMemberships.set(leagueId, list);
  }
})();

export function getDriverAvatarUrl(driverId: string): string {
  return getDriverAvatar(driverId);
}

export function getTeamLogoUrl(teamId: string): string {
  return getTeamLogo(teamId);
}

export function getLeagueBannerUrl(leagueId: string): string {
  return getLeagueBanner(leagueId);
}

/**
 * League membership API
 */

export function getMembership(leagueId: string, driverId: string): LeagueMembership | null {
  const list = leagueMemberships.get(leagueId);
  if (!list) return null;
  return list.find((m) => m.driverId === driverId) ?? null;
}

export function getLeagueMembers(leagueId: string): LeagueMembership[] {
  return [...(leagueMemberships.get(leagueId) ?? [])];
}

export function joinLeague(leagueId: string, driverId: string): void {
  const existing = getMembership(leagueId, driverId);
  if (existing && existing.status === 'active') {
    throw new Error('Already a member of this league');
  }

  const list = ensureLeagueMembershipArray(leagueId);
  const now = new Date();

  if (existing) {
    existing.status = 'active';
    existing.joinedAt = now.toISOString();
    return;
  }

  list.push({
    leagueId,
    driverId,
    role: list.length === 0 ? 'owner' : 'member',
    status: 'active',
    joinedAt: now.toISOString(),
  });
}

export function leaveLeague(leagueId: string, driverId: string): void {
  const list = ensureLeagueMembershipArray(leagueId);
  const membership = list.find((m) => m.driverId === driverId);
  if (!membership) {
    throw new Error('Not a member of this league');
  }
  if (membership.role === 'owner') {
    throw new Error('League owner cannot leave the league');
  }
  const idx = list.indexOf(membership);
  if (idx >= 0) {
    list.splice(idx, 1);
  }
}

export function requestToJoin(leagueId: string, driverId: string): void {
  const existing = getMembership(leagueId, driverId);
  if (existing && existing.status === 'active') {
    throw new Error('Already a member of this league');
  }

  const requests = leagueJoinRequests.get(leagueId) ?? [];
  const now = new Date().toISOString();
  const request: JoinRequest = {
    id: generateId('league-request'),
    leagueId,
    driverId,
    requestedAt: now,
  };
  requests.push(request);
  leagueJoinRequests.set(leagueId, requests);
}

export function isOwnerOrAdmin(leagueId: string, driverId: string): boolean {
  const membership = getMembership(leagueId, driverId);
  if (!membership) return false;
  return membership.role === 'owner' || membership.role === 'admin';
}

/**
 * League admin API (join requests and membership management)
 */

export function getJoinRequests(leagueId: string): JoinRequest[] {
  return [...(leagueJoinRequests.get(leagueId) ?? [])];
}

export function approveJoinRequest(requestId: string): void {
  for (const [leagueId, requests] of leagueJoinRequests.entries()) {
    const idx = requests.findIndex((r) => r.id === requestId);
    if (idx >= 0) {
      const request = requests[idx];
      requests.splice(idx, 1);
      leagueJoinRequests.set(leagueId, requests);
      joinLeague(leagueId, request.driverId);
      return;
    }
  }
  throw new Error('Join request not found');
}

export function rejectJoinRequest(requestId: string): void {
  for (const [leagueId, requests] of leagueJoinRequests.entries()) {
    const idx = requests.findIndex((r) => r.id === requestId);
    if (idx >= 0) {
      requests.splice(idx, 1);
      leagueJoinRequests.set(leagueId, requests);
      return;
    }
  }
  throw new Error('Join request not found');
}

export function removeMember(leagueId: string, driverId: string, performedBy: string): void {
  const performer = getMembership(leagueId, performedBy);
  if (!performer || (performer.role !== 'owner' && performer.role !== 'admin')) {
    throw new Error('Only owners or admins can remove members');
  }

  const list = ensureLeagueMembershipArray(leagueId);
  const membership = list.find((m) => m.driverId === driverId);
  if (!membership) {
    throw new Error('Member not found');
  }
  if (membership.role === 'owner') {
    throw new Error('Cannot remove the league owner');
  }
  const idx = list.indexOf(membership);
  if (idx >= 0) {
    list.splice(idx, 1);
  }
}

export function updateMemberRole(
  leagueId: string,
  driverId: string,
  newRole: MembershipRole,
  performedBy: string,
): void {
  const performer = getMembership(leagueId, performedBy);
  if (!performer || performer.role !== 'owner') {
    throw new Error('Only the league owner can update roles');
  }

  const list = ensureLeagueMembershipArray(leagueId);
  const membership = list.find((m) => m.driverId === driverId);
  if (!membership) {
    throw new Error('Member not found');
  }
  if (membership.role === 'owner') {
    throw new Error('Cannot change the owner role');
  }
  membership.role = newRole;
}

/**
 * Team API
 */

export function createTeam(initial: Pick<Team, 'name' | 'tag' | 'description' | 'leagues'>): Team {
  const id = generateId('team');
  const now = new Date();
  const team: Team = {
    id,
    name: initial.name,
    tag: initial.tag,
    description: initial.description,
    leagues: initial.leagues,
    ownerId: CURRENT_DRIVER_ID,
    createdAt: now,
  };
  teams.set(id, team);

  const members = ensureTeamMembershipArray(id);
  members.push({
    teamId: id,
    driverId: CURRENT_DRIVER_ID,
    role: 'owner',
    status: 'active',
    joinedAt: now,
  });

  return team;
}

export function getAllTeams(): Team[] {
  return [...teams.values()];
}

export function getTeam(teamId: string): Team | null {
  return teams.get(teamId) ?? null;
}

export function updateTeam(teamId: string, updates: Partial<Pick<Team, 'name' | 'tag' | 'description' | 'leagues'>>, updatedBy: string): void {
  const team = teams.get(teamId);
  if (!team) {
    throw new Error('Team not found');
  }
  const membership = getTeamMembership(teamId, updatedBy);
  if (!membership || (membership.role !== 'owner' && membership.role !== 'manager')) {
    throw new Error('Only owners or managers can update team');
  }

  teams.set(teamId, {
    ...team,
    ...updates,
  });
}

export function getTeamMembers(teamId: string): TeamMembership[] {
  return [...(teamMemberships.get(teamId) ?? [])];
}

export function getTeamMembership(teamId: string, driverId: string): TeamMembership | null {
  const list = teamMemberships.get(teamId);
  if (!list) return null;
  return list.find((m) => m.driverId === driverId) ?? null;
}

export function getDriverTeam(driverId: string): { team: Team; membership: TeamMembership } | null {
  for (const [teamId, memberships] of teamMemberships.entries()) {
    const membership = memberships.find((m) => m.driverId === driverId && m.status === 'active');
    if (membership) {
      const team = teams.get(teamId);
      if (team) {
        return { team, membership };
      }
    }
  }
  return null;
}

export function isTeamOwnerOrManager(teamId: string, driverId: string): boolean {
  const membership = getTeamMembership(teamId, driverId);
  if (!membership) return false;
  return membership.role === 'owner' || membership.role === 'manager';
}

export function joinTeam(teamId: string, driverId: string): void {
  const team = teams.get(teamId);
  if (!team) {
    throw new Error('Team not found');
  }
  const existing = getTeamMembership(teamId, driverId);
  if (existing && existing.status === 'active') {
    throw new Error('Already a member of this team');
  }

  const list = ensureTeamMembershipArray(teamId);
  const now = new Date();

  if (existing) {
    existing.status = 'active';
    existing.joinedAt = now;
    return;
  }

  list.push({
    teamId,
    driverId,
    role: list.length === 0 ? 'owner' : 'driver',
    status: 'active',
    joinedAt: now,
  });
}

export function leaveTeam(teamId: string, driverId: string): void {
  const list = ensureTeamMembershipArray(teamId);
  const membership = list.find((m) => m.driverId === driverId);
  if (!membership) {
    throw new Error('Not a member of this team');
  }
  if (membership.role === 'owner') {
    throw new Error('Team owner cannot leave the team');
  }
  const idx = list.indexOf(membership);
  if (idx >= 0) {
    list.splice(idx, 1);
  }
}

export function requestToJoinTeam(teamId: string, driverId: string, message?: string): void {
  const existing = getTeamMembership(teamId, driverId);
  if (existing && existing.status === 'active') {
    throw new Error('Already a member of this team');
  }

  const requests = teamJoinRequests.get(teamId) ?? [];
  const now = new Date();
  const request: TeamJoinRequest = {
    id: generateId('team-request'),
    teamId,
    driverId,
    message,
    requestedAt: now,
  };
  requests.push(request);
  teamJoinRequests.set(teamId, requests);
}

export function getTeamJoinRequests(teamId: string): TeamJoinRequest[] {
  return [...(teamJoinRequests.get(teamId) ?? [])];
}

export function approveTeamJoinRequest(requestId: string): void {
  for (const [teamId, requests] of teamJoinRequests.entries()) {
    const idx = requests.findIndex((r) => r.id === requestId);
    if (idx >= 0) {
      const request = requests[idx];
      requests.splice(idx, 1);
      teamJoinRequests.set(teamId, requests);
      joinTeam(teamId, request.driverId);
      return;
    }
  }
  throw new Error('Join request not found');
}

export function rejectTeamJoinRequest(requestId: string): void {
  for (const [teamId, requests] of teamJoinRequests.entries()) {
    const idx = requests.findIndex((r) => r.id === requestId);
    if (idx >= 0) {
      requests.splice(idx, 1);
      teamJoinRequests.set(teamId, requests);
      return;
    }
  }
  throw new Error('Join request not found');
}

export function removeTeamMember(teamId: string, driverId: string, performedBy: string): void {
  const performerMembership = getTeamMembership(teamId, performedBy);
  if (!performerMembership || (performerMembership.role !== 'owner' && performerMembership.role !== 'manager')) {
    throw new Error('Only owners or managers can remove members');
  }

  const list = ensureTeamMembershipArray(teamId);
  const membership = list.find((m) => m.driverId === driverId);
  if (!membership) {
    throw new Error('Member not found');
  }
  if (membership.role === 'owner') {
    throw new Error('Cannot remove the team owner');
  }
  const idx = list.indexOf(membership);
  if (idx >= 0) {
    list.splice(idx, 1);
  }
}

export function updateTeamMemberRole(teamId: string, driverId: string, newRole: TeamRole, performedBy: string): void {
  const performerMembership = getTeamMembership(teamId, performedBy);
  if (!performerMembership || (performerMembership.role !== 'owner' && performerMembership.role !== 'manager')) {
    throw new Error('Only owners or managers can update roles');
  }

  const membership = getTeamMembership(teamId, driverId);
  if (!membership) {
    throw new Error('Member not found');
  }
  if (membership.role === 'owner') {
    throw new Error('Cannot change the owner role');
  }
  membership.role = newRole;
}

/**
 * Race registration API
 */

export function isRegistered(raceId: string, driverId: string): boolean {
  const set = raceRegistrations.get(raceId);
  if (!set) return false;
  return set.has(driverId);
}

export function registerForRace(raceId: string, driverId: string, _leagueId: string): void {
  const set = ensureRaceRegistrationSet(raceId);
  if (set.has(driverId)) {
    throw new Error('Already registered for this race');
  }
  set.add(driverId);
}

export function withdrawFromRace(raceId: string, driverId: string): void {
  const set = raceRegistrations.get(raceId);
  if (!set || !set.has(driverId)) {
    throw new Error('Not registered for this race');
  }
  set.delete(driverId);
}

export function getRegisteredDrivers(raceId: string): string[] {
  const set = raceRegistrations.get(raceId);
  if (!set) return [];
  return [...set.values()];
}