/* ============================================================
 * pb_ui.js · 物理弹球 Web 复刻版 · 界面 / 输入 / 主循环
 * 屏幕：主菜单(直接拖拽开局) / 指南 / 暂停 / 结束 / 记录 / 设置
 * 存档走 PBStorage，音效走 PBAudio。
 * ============================================================ */
var PBUi = (function () {
  'use strict';
  var R = PBRules, F = R.FIELD;
  var g = null;
  var canvas, ctx;
  var lastTs = 0, globalT = 0;

  function $(id) { return document.getElementById(id); }
  function show(id) { $(id).classList.remove('hidden'); }
  function hide(id) { $(id).classList.add('hidden'); }

  function fmtSecs(s) {
    var m = Math.floor(s / 60), ss = Math.floor(s % 60);
    return (m < 10 ? '0' + m : m) + ':' + (ss < 10 ? '0' + ss : ss);
  }

  // ---- 主菜单演示背景 ----
  function toIdleDemo() {
    PBGame.startGame(g);
    g.state = 'idle';
    $('pb-best').textContent = '最佳: ' + PBStorage.getBest().toLocaleString();
    $('pb-ball-count').textContent = PBStorage.getBalls();
    if (PBStorage.canClaimDaily()) show('pb-daily'); else hide('pb-daily');
    show('pb-menu'); hide('pb-hud'); hide('pb-over');
  }

  // ---- 开局（消耗 1 球；不足时救济 +1，保证可玩） ----
  function tryStart() {
    if (!PBStorage.spendBall()) {
      PBStorage.addBalls(1);
      PBStorage.spendBall();
    }
    PBGame.startGame(g);
    lastScore = 0;
    hide('pb-menu'); show('pb-hud');
  }

  function toLogical(e) {
    var rect = canvas.getBoundingClientRect();
    return {
      x: (e.clientX - rect.left) / rect.width * F.W,
      y: (e.clientY - rect.top) / rect.height * F.H
    };
  }

  function setAim(p) {
    var fx = F.arcCx, fy = F.checkY - 6;
    var dx = p.x - fx, dy = p.y - fy;
    if (dy < 40) dy = 40;
    var ang = Math.atan2(dx, dy);
    g.aimAngle = Math.max(-1.25, Math.min(1.25, ang));
  }

  var downPos = null, pendingStart = false;
  function dist(a, b) { var dx = a.x - b.x, dy = a.y - b.y; return Math.sqrt(dx * dx + dy * dy); }

  function onDown(e) {
    PBAudio.unlock();
    if (g.paused || g.state === 'over') return;
    var p = toLogical(e);
    if (g.state === 'idle') { pendingStart = true; downPos = p; return; }  // 主菜单：拖拽超阈值才开局，防误触
    if (g.state === 'aim' && g.queue.length) {
      g.aiming = true;
      downPos = p;
      setAim(p);
    }
  }
  function onMove(e) {
    var p = toLogical(e);
    if (pendingStart && downPos) {
      if (dist(p, downPos) > 14) {   // 确认是拖拽才开局，并直接进入瞄准
        pendingStart = false;
        tryStart();
        g.aiming = true;
        setAim(p);
      }
      return;
    }
    if (g.aiming) setAim(p);
  }
  function onUp(e) {
    if (pendingStart) { pendingStart = false; downPos = null; return; }  // 主菜单轻点 = 无操作
    if (g.aiming) {
      g.aiming = false;
      var p = e && e.clientX !== undefined ? toLogical(e) : null;
      if (p && downPos && dist(p, downPos) < 10) { downPos = null; return; }  // 轻点 = 取消瞄准，不发射
      downPos = null;
      PBGame.fire(g);
    }
  }

  // ---- 结束结算 ----
  function onOver() {
    PBStorage.addRecord(g.score, Math.floor(g.secs));
    var best = PBStorage.getBest();
    var isNew = g.score > best;
    if (isNew) PBStorage.setBest(g.score);
    $('pb-over-score').textContent = g.score.toLocaleString();
    $('pb-over-time').textContent = '用时 ' + fmtSecs(g.secs);
    $('pb-over-new').style.display = isNew ? '' : 'none';
    $('pb-over-best').textContent = '最佳: ' + PBStorage.getBest().toLocaleString();
    show('pb-over');
    hide('pb-hud');
  }

  // ---- 记录页 ----
  function renderRecords() {
    var list = PBStorage.getRecords();
    var box = $('pb-records-list');
    box.innerHTML = '';
    if (!list.length) {
      box.innerHTML = '<div class="pb-rec-empty">暂无记录，去打一局吧</div>';
      return;
    }
    for (var i = 0; i < list.length; i++) {
      var r = list[i];
      var row = document.createElement('div');
      row.className = 'pb-rec-row ' + (i % 2 ? 'alt' : '');
      var color = R.RECORD_COLORS[i % R.RECORD_COLORS.length];
      row.innerHTML =
        '<span class="pb-rec-rank" style="color:' + color + '">' + (i + 1) + '.</span>' +
        '<span class="pb-rec-date" style="color:' + color + '">' + r.date + '</span>' +
        '<span class="pb-rec-right"><b style="color:' + color + '">' + r.score.toLocaleString() + '</b>' +
        '<i style="color:' + color + '">' + fmtSecs(r.secs) + '</i></span>';
      box.appendChild(row);
    }
  }

  // ---- 指南演示小图 ----
  function drawGuideDemo() {
    var c = $('pb-guide-demo');
    if (!c) return;
    var x = c.getContext('2d');
    x.clearRect(0, 0, c.width, c.height);
    x.strokeStyle = '#8a8a8a'; x.lineWidth = 2;
    x.beginPath();
    x.moveTo(20, 10); x.lineTo(20, 150);
    x.moveTo(200, 10); x.lineTo(200, 150);
    x.moveTo(20, 10); x.lineTo(95, 42);
    x.moveTo(200, 10); x.lineTo(125, 42);
    x.stroke();
    x.setLineDash([4, 4]);
    x.beginPath(); x.moveTo(20, 48); x.lineTo(200, 48); x.stroke();
    x.setLineDash([]);
    // 待发球
    x.fillStyle = '#a97a45';
    [[105, 34], [117, 30], [93, 30], [111, 20]].forEach(function (p) {
      x.beginPath(); x.arc(p[0], p[1], 5, 0, 7); x.fill();
    });
    // 轨迹点
    x.fillStyle = '#c89458';
    for (var i = 0; i < 9; i++) {
      x.beginPath(); x.arc(112 + i * 8, 56 + i * 11, 3, 0, 7); x.fill();
    }
    // 彩色砖块
    var blocks = [
      ['#f7c81a', 55, 95, '3'], ['#8bd420', 95, 95, '10'], ['#37c837', 130, 95, '8'], ['#f7c81a', 185, 95, '1'],
      ['#37c837', 90, 122, '13'], ['#2fd4c8', 125, 122, '24'], ['#f7c81a', 172, 122, '6'],
      ['#2f7bff', 55, 148, '80'], ['#29c8e2', 115, 148, '29'], ['#a02fe0', 185, 148, '100']
    ];
    blocks.forEach(function (b) {
      x.fillStyle = b[0];
      x.fillRect(b[1] - 11, b[2] - 9, 22, 18);
      x.fillStyle = b[3].length > 2 ? '#fff' : '#20180a';
      x.font = 'bold 10px sans-serif'; x.textAlign = 'center'; x.textBaseline = 'middle';
      x.fillText(b[3], b[1], b[2] + 1);
    });
    // 道具
    x.strokeStyle = '#eee'; x.setLineDash([3, 3]);
    x.beginPath(); x.arc(152, 122, 8, 0, 7); x.stroke();
    x.setLineDash([]);
  }

  // ---- ∞ 三色 logo ----
  function drawLogo() {
    var c = $('pb-logo');
    if (!c) return;
    var x = c.getContext('2d');
    x.clearRect(0, 0, c.width, c.height);
    var colors = ['#f7c81a', '#2f7bff', '#ff2f7b'];
    for (var k = 0; k < colors.length; k++) {
      x.strokeStyle = colors[k];
      x.lineWidth = 5;
      x.beginPath();
      var off = (k - 1) * 4;
      for (var i = 0; i <= 200; i++) {
        var t = i / 200 * Math.PI * 2;
        var s2 = Math.sin(t) * Math.sin(t);
        var px = 110 + 78 * Math.cos(t) / (1 + s2);
        var py = 60 + (46 + off) * Math.sin(t) * Math.cos(t) / (1 + s2);
        if (i === 0) x.moveTo(px, py); else x.lineTo(px, py);
      }
      x.stroke();
    }
  }

  function toast(msg) {
    var t = $('pb-toast');
    t.textContent = msg;
    t.classList.add('show');
    setTimeout(function () { t.classList.remove('show'); }, 1800);
  }

  // ---- 分数弹跳反馈 ----
  var lastScore = 0;
  function popScore() {
    var el = $('pb-score');
    el.classList.remove('pop');
    void el.offsetWidth;
    el.classList.add('pop');
  }

  // ---- 主循环 ----
  function loop(ts) {
    var dt = Math.min(0.033, (ts - lastTs) / 1000 || 0.016);
    lastTs = ts;
    globalT += dt;
    var prevState = g.state;
    PBGame.update(g, dt);
    if (g.state === 'over' && prevState !== 'over') onOver();
    PBRender.draw(ctx, g, globalT);
    // HUD
    if (g.state !== 'idle') {
      $('pb-time').textContent = '时间 ' + fmtSecs(g.secs);
      $('pb-score').textContent = g.score.toLocaleString();
      $('pb-balls').textContent = '🥎 ' + (g.queue.length + g.balls.length + g.recycle.length);
      $('pb-big').classList.toggle('hidden', !g.bigTurn);
      if (g.score !== lastScore) { lastScore = g.score; popScore(); }
    }
    requestAnimationFrame(loop);
  }

  function bind() {
    canvas = $('pb-canvas');
    ctx = canvas.getContext('2d');
    canvas.addEventListener('pointerdown', onDown);
    window.addEventListener('pointermove', onMove);
    window.addEventListener('pointerup', onUp);

    $('pb-pause-btn').addEventListener('click', function () {
      if (g.state === 'idle' || g.state === 'over') return;
      g.paused = true;
      show('pb-pause');
    });
    $('pb-resume').addEventListener('click', function () { g.paused = false; hide('pb-pause'); });
    $('pb-restart').addEventListener('click', function () {
      hide('pb-pause');
      g.paused = false;
      tryStart();
    });
    $('pb-share').addEventListener('click', function () {
      var text = '我在「物理弹球」' + fmtSecs(g.secs) + ' 打了 ' + g.score.toLocaleString() + ' 分，来挑战我！';
      try {
        navigator.clipboard.writeText(text).then(function () { toast('成绩已复制，去分享吧'); }, function () { toast(text); });
      } catch (e) { toast(text); }
    });

    $('pb-again').addEventListener('click', function () {
      hide('pb-over');
      tryStart();
    });
    $('pb-to-menu').addEventListener('click', function () { toIdleDemo(); });

    $('pb-help').addEventListener('click', function () { drawGuideDemo(); show('pb-guide'); });
    $('pb-guide-ok').addEventListener('click', function () { hide('pb-guide'); PBStorage.markGuideSeen(); });

    $('pb-gear').addEventListener('click', function () {
      $('pb-sound-toggle').checked = PBStorage.soundOn();
      $('pb-escape-slider').value = PBStorage.getEscape();
      $('pb-escape-val').textContent = PBStorage.getEscape();
      show('pb-settings');
    });
    $('pb-settings-close').addEventListener('click', function () { hide('pb-settings'); });
    $('pb-sound-toggle').addEventListener('change', function (e) {
      PBStorage.setSound(e.target.checked);
      toast(e.target.checked ? '音效已开启' : '音效已关闭');
    });
    // 逃逸强度滑块：实时存储，局内立即生效
    $('pb-escape-slider').addEventListener('input', function (e) {
      PBStorage.setEscape(e.target.value);
      $('pb-escape-val').textContent = PBStorage.getEscape();
    });

    $('pb-side-records').addEventListener('click', function () { renderRecords(); show('pb-records'); });
    $('pb-records-close').addEventListener('click', function () { hide('pb-records'); });

    $('pb-daily').addEventListener('click', function () {
      if (PBStorage.claimDaily()) {
        PBAudio.claim();
        toast('领取成功 +3 球');
        $('pb-ball-count').textContent = PBStorage.getBalls();
        hide('pb-daily');
      }
    });
    $('pb-side-balls').addEventListener('click', function () {
      toast('当前球数 ' + PBStorage.getBalls() + '；每局消耗 1 球，局内 +1 球道具可补充');
    });
  }

  function init() {
    g = PBGame.create();
    bind();
    drawLogo();
    toIdleDemo();
    if (!PBStorage.guideSeen()) { drawGuideDemo(); show('pb-guide'); }
    requestAnimationFrame(function (ts) { lastTs = ts; requestAnimationFrame(loop); });
  }

  return { init: init };
})();

window.addEventListener('load', function () { PBUi.init(); });