/* ============================================================================
   Super Sunday — Frontend API client (ESM)
   ============================================================================ */
const BASE = '/api';
const TOKEN_KEY = 'ss_token';

function getToken() { return localStorage.getItem(TOKEN_KEY) || ''; }
function setToken(t) { if (t) localStorage.setItem(TOKEN_KEY, t); else localStorage.removeItem(TOKEN_KEY); }

async function fetchJSON(url, opts = {}) {
  const res = await fetch(url, opts);
  const ct = res.headers.get('content-type') || '';
  const isJSON = ct.includes('application/json');
  const data = isJSON ? await res.json().catch(() => ({})) : await res.text();
  if (!res.ok) {
    const err = new Error((data && data.error) || res.statusText || 'HTTP Error');
    err.status = res.status; err.payload = data;
    throw err;
  }
  return data;
}

async function authFetch(path, options = {}) {
  const token = getToken();
  const headers = new Headers(options.headers || {});
  headers.set('Content-Type','application/json');
  if(token) headers.set('Authorization',`Bearer ${token}`);
  return fetchJSON(`${BASE}${path}`,{...options,headers});
}

/* Public endpoints */
export async function listTournaments(){ return fetchJSON(`${BASE}/tournaments`); }
export async function getTournament(id){ return fetchJSON(`${BASE}/tournaments/${id}`); }
export async function listParticipants(id){ return fetchJSON(`${BASE}/tournaments/${id}/participants`); }
export async function listMatches(id){ return fetchJSON(`${BASE}/tournaments/${id}/matches`); }

/* Admin endpoints */
export async function login(email,password){
  const data = await fetchJSON(`${BASE}/auth/login`,{
    method:'POST',headers:{'Content-Type':'application/json'},
    body: JSON.stringify({email,password})
  });
  if(data && data.token) setToken(data.token);
  return data;
}
export function logout(){ setToken(''); }
export function isAuthenticated(){ return !!getToken(); }

export async function createTournament(payload){
  return authFetch(`/tournaments`,{method:'POST',body:JSON.stringify(payload)});
}
export async function addParticipant(tid,payload){
  return authFetch(`/tournaments/${tid}/participants`,{method:'POST',body:JSON.stringify(payload)});
}
export async function generateAmericano(tid,payload){
  return authFetch(`/tournaments/${tid}/generate-americano`,{method:'POST',body:JSON.stringify(payload)});
}
export async function scoreMatch(mid,payload){
  return authFetch(`/matches/${mid}/score`,{method:'POST',body:JSON.stringify(payload)});
}

/* Helpers */
export function bindLoginForm({formSel='#loginSection',statusSel='#loginStatus'}={}){
  const form=document.querySelector(formSel);
  const status=document.querySelector(statusSel);
  if(!form) return;
  const email=form.querySelector('#email');
  const password=form.querySelector('#password');
  const btn=form.querySelector('#loginBtn');
  btn?.addEventListener('click',async ()=>{
    status.textContent='Connexion…';
    try{
      await login(email.value.trim(),password.value);
      status.textContent='Connecté ✔';
      const admin=document.querySelector('#adminSection');
      if(admin) admin.style.display='grid';
      form.style.display='none';
    }catch(e){ status.textContent=`Erreur: ${e.payload?.error||e.message}`; }
  });
}