/**
 * diora — radio player
 * Handles playback, SSE metadata, search, station management, and affiliate links.
 */

'use strict';

// ---------------------------------------------------------------------------
// State
// ---------------------------------------------------------------------------

// Hardcoded for now -- only creamfresh radio gets the vote buttons, since
// only its backend (the DJ) actually does anything with them.
const CREAMFRESH_RADIO_URL = 'https://diora.creamfresh.xyz/radio/creamfresh-stream/';

let currentStation = null;   // { url, name, id } | null
let currentTrack = '';
let sseSource = null;
let isPlaying = false;
let currentPlayId = null;

const audio = new Audio();

// Reconnect audio when the output device changes (e.g. Bluetooth, USB DAC)
if (navigator.mediaDevices) {
  let _deviceChangeDebounce = null;
  navigator.mediaDevices.addEventListener('devicechange', () => {
    clearTimeout(_deviceChangeDebounce);
    _deviceChangeDebounce = setTimeout(() => {
      if (!isPlaying || audio.src === '') return;
      const savedTime = audio.currentTime;
      const savedSrc  = audio.src;
      audio.src = savedSrc;
      audio.load();
      if (savedTime > 0) {
        audio.addEventListener('loadedmetadata', function onMeta() {
          audio.currentTime = savedTime;
          audio.removeEventListener('loadedmetadata', onMeta);
        });
      }
      audio.play().catch(() => {});
    }, 500);
  });
}

// ---------------------------------------------------------------------------
// DOM helpers
// ---------------------------------------------------------------------------

function $(id) { return document.getElementById(id); }

function getCsrfToken() {
  const cookie = document.cookie.split('; ').find(r => r.startsWith('csrftoken='));
  return cookie ? cookie.split('=')[1] : '';
}

function formatDateTime(iso) {
  if (!iso) return '';
  const d = new Date(iso);
  const pad = n => String(n).padStart(2, '0');
  return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} `
       + `${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

function escapeHtml(str) {
  return String(str)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}

// ---------------------------------------------------------------------------
// Modal dialogs — styled replacements for native alert()/confirm()/prompt(),
// which look jarring against the rest of the custom dark UI and can't be
// styled or (in confirm/prompt's case) awaited without blocking the thread.
// All three return a Promise; callers must be async and `await` them.
// ---------------------------------------------------------------------------

function _showModal({ message, showInput = false, inputValue = '', showCancel = false, okLabel = 'OK', danger = false }) {
  return new Promise((resolve) => {
    const overlay  = $('modal-overlay');
    const dialog   = $('modal-dialog');
    const msgEl    = $('modal-message');
    const inputEl  = $('modal-input');
    const okBtn    = $('modal-ok-btn');
    const cancelBtn = $('modal-cancel-btn');
    if (!overlay || !dialog) { resolve(null); return; }

    msgEl.textContent = message;
    inputEl.style.display = showInput ? '' : 'none';
    inputEl.value = inputValue;
    cancelBtn.style.display = showCancel ? '' : 'none';
    okBtn.textContent = okLabel;
    okBtn.className = danger ? 'btn btn-danger' : 'btn btn-primary';

    overlay.style.display = '';
    dialog.style.display = '';
    (showInput ? inputEl : okBtn).focus();
    if (showInput) inputEl.select();

    function cleanup(result) {
      overlay.style.display = 'none';
      dialog.style.display = 'none';
      overlay.removeEventListener('click', onCancel);
      okBtn.removeEventListener('click', onOk);
      cancelBtn.removeEventListener('click', onCancel);
      document.removeEventListener('keydown', onKeydown);
      resolve(result);
    }
    function onOk()     { cleanup(showInput ? inputEl.value : true); }
    function onCancel() { cleanup(showInput ? null : false); }
    function onKeydown(e) {
      if (e.key === 'Escape') onCancel();
      if (e.key === 'Enter' && showInput) onOk();
    }

    okBtn.addEventListener('click', onOk);
    cancelBtn.addEventListener('click', onCancel);
    overlay.addEventListener('click', onCancel);
    document.addEventListener('keydown', onKeydown);
  });
}

function customAlert(message) {
  return _showModal({ message });
}

function customConfirm(message, { danger = false } = {}) {
  return _showModal({ message, showCancel: true, danger });
}

// The server answers with short English error codes (an API contract, tests and
// other clients rely on them); what the page shows of them is German.
const _GERMAN_ERRORS = {
  'no stations found in file': 'In der Datei wurden keine Sender gefunden.',
  'file must be .m3u or .m3u8': 'Die Datei muss eine .m3u- oder .m3u8-Datei sein.',
  'no file uploaded': 'Keine Datei hochgeladen.',
  'only jpeg, png, or webp allowed': 'Nur JPEG, PNG oder WebP erlaubt.',
  'file too large (max 100 MB)': 'Datei zu groß (höchstens 100 MB).',
  'file too large (max 5 MB)': 'Datei zu groß (höchstens 5 MB).',
  'authentication required': 'Bitte anmelden.',
  'not found': 'Nicht gefunden.',
  'invalid JSON': 'Ungültige Anfrage.',
  'upstream unreachable': 'Der Server dahinter ist nicht erreichbar.',
};
function _germanError(code) {
  return _GERMAN_ERRORS[code] || code;
}

function customPrompt(message, defaultValue = '') {
  return _showModal({ message, showInput: true, inputValue: defaultValue, showCancel: true });
}