const BASE = '/api';

function withDevUser(path: string): string {
  const devUser = new URLSearchParams(window.location.search).get('devUser');
  if (!devUser) return path;
  const sep = path.includes('?') ? '&' : '?';
  return `${path}${sep}devUser=${devUser}`;
}

async function request<T>(path: string, options?: RequestInit): Promise<T> {
  const res = await fetch(`${BASE}${withDevUser(path)}`, {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      ...options?.headers,
    },
  });
  if (!res.ok) {
    const err = await res.json().catch(() => ({ error: res.statusText }));
    throw new Error(err.message || err.error || 'Request failed');
  }
  return res.json();
}

export const api = {
  // Matches
  getMatches: (params?: { stage?: string; group?: string }) => {
    const q = new URLSearchParams(params as Record<string, string>).toString();
    return request<{ matches: Match[]; count: number }>(`/matches${q ? '?' + q : ''}`);
  },

  // Tips
  submitTip: (matchId: number, tipHome: number, tipAway: number) =>
    request<{ success: boolean; tip: TipInfo; message: string }>('/tips', {
      method: 'POST',
      body: JSON.stringify({ matchId, tipHome, tipAway }),
    }),

  getMyTips: () =>
    request<{ tips: MyTip[]; count: number }>('/tips'),

  // Leaderboard
  getLeaderboard: () =>
    request<LeaderboardResponse>('/leaderboard'),

  getMyStats: () =>
    request<UserStats>('/leaderboard/me'),

  // Profile
  updateTeam: (team: string) =>
    request<{ success: boolean; team: string }>('/profile/team', {
      method: 'PATCH',
      body: JSON.stringify({ team }),
    }),

  // Dashboard
  getDashboard: () => request<DashboardData>('/dashboard'),

  // Achievements
  getAchievements: () => request<AchievementsData>('/achievements'),

  // Admin
  syncMatches: () =>
    request<{ success: boolean; total: number; created: number; updated: number }>(
      '/admin/sync',
      { method: 'POST' }
    ),
  evaluateTips: () =>
    request<{ success: boolean; matchesEvaluated: number; tipsUpdated: number }>(
      '/admin/evaluate',
      { method: 'POST' }
    ),
};

// Types (gespiegelt vom Backend)
export interface DashboardData {
  hero: {
    match: {
      id: number;
      homeTeam: { name: string; shortName: string; crest: string | null };
      awayTeam: { name: string; shortName: string; crest: string | null };
      utcDate: string;
      status: string;
      minutesUntilKickoff: number;
    };
    userTip: { home: number; away: number } | null;
    tippable: boolean;
  } | null;
  stats: { rank: number | null; totalPoints: number; streak: number };
  nudges: Array<{ type: string; text: string; matchId?: number }>;
}


export interface Match {
  id: number;
  externalId: number;
  utcDate: string;
  status: string;
  stage: string;
  group: string | null;
  homeTeam: { name: string; shortName: string; crest: string | null };
  awayTeam: { name: string; shortName: string; crest: string | null };
  score: { home: number | null; away: number | null };
  userTip: TipInfo | null;
  minutesUntilKickoff: number;
  tippable: boolean;
}

export interface TipInfo {
  home: number;
  away: number;
  points: number | null;
}

export interface MyTip {
  match_id: number;
  tip_home: number;
  tip_away: number;
  points: number | null;
  utc_date: string;
  home_team_short: string;
  away_team_short: string;
  status: string;
}

export interface LeaderboardEntry {
  user_id: string;
  full_name: string;
  team: string | null;
  total_points: number;
  tips_count: number;
  exact_count: number;
  tendency_count: number;
  rank: number;
}

export interface LeaderboardResponse {
  entries: LeaderboardEntry[];
  currentUserRank: number | null;
  currentUserId: string | null;
  totalParticipants: number;
  lastUpdated: string;
}

export interface UserStats {
  userId: string;
  fullName: string;
  team: string | null;
  totalPoints: number;
  rank: number | null;
  tipsCount: number;
  exactCount: number;
  tendencyCount: number;
  wrongCount: number;
  accuracy: number;
}

export interface Achievement {
  id: string;
  name: string;
  description: string;
  icon: string;
  color: string;
  rankLabel: string;
  unlocked: boolean;
  progress: number;
  current: number;
  target: number;
}

export interface AchievementsData {
  achievements: Achievement[];
  unlockedCount: number;
  total: number;
}