/* Dev Lab – polymorphe Spiel-Engine. Aufgaben kommen aus /api/devlab/games/{slug}/session
   (ohne Lösung), geprüft + bewertet wird serverseitig. Eine Render-/Submit-Funktion je Typ:
   cloze · choice · order · spot · match · regex. Interaktion klick-basiert. */
(function () {
  'use strict';

  const MAX_ATTEMPTS = 3;
  const GAME = 'devlab';
  const slug = document.body.dataset.game || '';
  const MECH_LABEL = {
    cloze: 'Lücken füllen', choice: 'Multiple Choice', order: 'Zusammensetzen',
    spot: 'Bug finden', match: 'Zuordnen', regex: 'Regex'
  };

  const el = (id) => document.getElementById(id);
  const r = {
    title: el('dlg-title'), language: el('dlg-language'), taskNo: el('dlg-task-no'),
    score: el('dlg-score'), time: el('dlg-time'), best: el('dlg-best'), mech: el('dlg-mech'),
    kind: el('dlg-kind'), points: el('dlg-points'), prompt: el('dlg-prompt'),
    narrative: el('dlg-narrative'), instruction: el('dlg-instruction'), playfield: el('dlg-playfield'),
    feedback: el('dlg-feedback'), success: el('dlg-success'),
    check: el('dlg-check'), hint: el('dlg-hint'), reveal: el('dlg-reveal'), next: el('dlg-next'),
    result: el('dlg-result'), resultStars: el('dlg-result-stars'), resultScore: el('dlg-result-score'),
    resultMax: el('dlg-result-max'), resultDetail: el('dlg-result-detail'), resultHigh: el('dlg-result-high'),
    again: el('dlg-again'), description: el('dlg-description'), sideTitle: el('dlg-side-title'),
    progress: el('dlg-progress'), bestLine: el('dlg-best-line')
  };

  let session = null, index = 0, score = 0, seconds = 0, timer = null, running = false;
  let finishItems = [];
  let cur = null; // { task, attempts, solved, revealed, collect, lock, mark }

  // ---------- Helfer ----------
  const escapeHtml = (v) => String(v).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
  const formatTime = (s) => `${Math.floor(s / 60)}:${String(s % 60).padStart(2, '0')}`;
  function awarded(points, attempts) {
    const a = Math.max(1, attempts);
    return Math.round(points * (a === 1 ? 1 : a === 2 ? 0.6 : 0.3));
  }
  function starString(stars) {
    const n = Math.max(0, Math.min(3, stars));
    return '★'.repeat(n) + '☆'.repeat(3 - n);
  }
  function startTimer() { if (!timer) timer = setInterval(() => { seconds++; r.time.textContent = formatTime(seconds); }, 1000); }
  function stopTimer() { clearInterval(timer); timer = null; }

  function updateHud() {
    r.taskNo.textContent = `${Math.min(index + 1, session.tasks.length)} / ${session.tasks.length}`;
    r.score.textContent = String(score);
    r.progress.style.width = `${Math.round((index / session.tasks.length) * 100)}%`;
  }

  // ---------- Renderer je Mechanik ----------
  const RENDERERS = {
    cloze(task) {
      const inputs = {};
      const pre = document.createElement('pre');
      pre.className = 'dlg-code';
      const code = document.createElement('code');
      const tpl = task.codeTemplate || '';
      const regex = /\{\{(\d+)\}\}/g;
      const gapMap = Object.fromEntries((task.gaps || []).map((g) => [g.position, g]));
      let last = 0, m;
      while ((m = regex.exec(tpl)) !== null) {
        if (m.index > last) code.appendChild(document.createTextNode(tpl.slice(last, m.index)));
        const pos = Number(m[1]);
        const gap = gapMap[pos] || {};
        const input = document.createElement('input');
        input.type = 'text'; input.className = 'dlg-gap'; input.dataset.pos = pos;
        input.autocomplete = 'off'; input.autocapitalize = 'off'; input.spellcheck = false;
        input.setAttribute('autocorrect', 'off');
        if (gap.placeholder) input.placeholder = gap.placeholder;
        input.size = Math.max(6, (gap.placeholder || '').length + 1);
        input.addEventListener('input', () => { input.size = Math.max(4, input.value.length + 1); });
        input.addEventListener('keydown', (e) => { if (e.key === 'Enter') { e.preventDefault(); doCheck(false); } });
        inputs[pos] = input;
        code.appendChild(input);
        last = m.index + m[0].length;
      }
      if (last < tpl.length) code.appendChild(document.createTextNode(tpl.slice(last)));
      pre.appendChild(code);
      r.playfield.appendChild(pre);
      const first = Object.values(inputs)[0]; if (first) first.focus();
      return {
        collect: () => ({ gaps: Object.entries(inputs).map(([pos, i]) => ({ position: Number(pos), text: i.value })) }),
        lock: () => Object.values(inputs).forEach((i) => { i.disabled = true; }),
        mark: (data) => (data.detail || []).forEach((d) => {
          const i = inputs[d.position]; if (!i) return;
          i.classList.toggle('correct', d.correct); i.classList.toggle('wrong', !d.correct);
          if (d.solution) { i.value = d.solution; i.classList.remove('wrong'); i.classList.add('revealed'); }
        })
      };
    },

    choice(task) {
      let selected = null;
      const wrap = document.createElement('div'); wrap.className = 'dlg-choices';
      if (task.code) { const pre = document.createElement('pre'); pre.className = 'dlg-code'; pre.textContent = task.code; r.playfield.appendChild(pre); }
      if (task.question) { const q = document.createElement('p'); q.className = 'dlg-question'; q.textContent = task.question; r.playfield.appendChild(q); }
      (task.options || []).forEach((opt) => {
        const b = document.createElement('button');
        b.type = 'button'; b.className = 'dlg-choice'; b.textContent = opt;
        b.addEventListener('click', () => {
          if (cur.solved || cur.revealed) return;
          selected = opt;
          wrap.querySelectorAll('.dlg-choice').forEach((x) => x.classList.toggle('selected', x === b));
        });
        wrap.appendChild(b);
      });
      r.playfield.appendChild(wrap);
      return {
        collect: () => ({ choice: selected || '' }),
        lock: () => wrap.querySelectorAll('.dlg-choice').forEach((b) => { b.disabled = true; }),
        mark: (data) => {
          wrap.querySelectorAll('.dlg-choice').forEach((b) => {
            if (b.textContent === selected) b.classList.add(data.correct ? 'correct' : 'wrong');
            if (data.solution && b.textContent === data.solution) b.classList.add('correct');
          });
        }
      };
    },

    order(task) {
      const answer = document.createElement('div'); answer.className = 'dlg-order-answer'; answer.dataset.empty = 'Hier in die richtige Reihenfolge klicken …';
      const bank = document.createElement('div'); bank.className = 'dlg-order-bank';
      function chip(text, inAnswer) {
        const b = document.createElement('button'); b.type = 'button'; b.className = 'dlg-token'; b.textContent = text;
        b.addEventListener('click', () => {
          if (cur.solved || cur.revealed) return;
          if (inAnswer) { bank.appendChild(chip(text, false)); b.remove(); }
          else { answer.appendChild(chip(text, true)); b.remove(); }
          answer.classList.toggle('filled', answer.children.length > 0);
        });
        return b;
      }
      (task.items || []).forEach((it) => bank.appendChild(chip(it, false)));
      const wrap = document.createElement('div'); wrap.className = 'dlg-order';
      const lblA = document.createElement('p'); lblA.className = 'dlg-mini'; lblA.textContent = 'Deine Reihenfolge:';
      const lblB = document.createElement('p'); lblB.className = 'dlg-mini'; lblB.textContent = 'Bausteine:';
      wrap.append(lblA, answer, lblB, bank);
      r.playfield.appendChild(wrap);
      return {
        collect: () => ({ order: Array.from(answer.children).map((c) => c.textContent) }),
        lock: () => wrap.querySelectorAll('.dlg-token').forEach((b) => { b.disabled = true; }),
        mark: (data) => { if (data.solution) { const s = document.createElement('p'); s.className = 'dlg-mini reveal'; s.textContent = 'Lösung: ' + data.solution; wrap.appendChild(s); } }
      };
    },

    spot(task) {
      let selected = -1;
      const box = document.createElement('div'); box.className = 'dlg-spot';
      (task.tokens || []).forEach((tok, i) => {
        const b = document.createElement('button'); b.type = 'button'; b.className = 'dlg-spot-token'; b.textContent = tok;
        b.addEventListener('click', () => {
          if (cur.solved || cur.revealed) return;
          selected = i;
          box.querySelectorAll('.dlg-spot-token').forEach((x, j) => x.classList.toggle('selected', j === i));
        });
        box.appendChild(b);
      });
      r.playfield.appendChild(box);
      return {
        collect: () => ({ index: selected }),
        lock: () => box.querySelectorAll('.dlg-spot-token').forEach((b) => { b.disabled = true; }),
        mark: (data) => {
          if (data.correct && selected >= 0) box.children[selected].classList.add('correct');
          else if (selected >= 0) box.children[selected].classList.add('wrong');
          const sol = data.solution; if (sol && typeof sol.index === 'number' && box.children[sol.index]) box.children[sol.index].classList.add('correct');
        }
      };
    },

    match(task) {
      const left = task.left || [], right = task.right || [];
      const conn = {}; // leftIndex -> rightIndex
      let activeLeft = -1;
      const wrap = document.createElement('div'); wrap.className = 'dlg-match';
      const colL = document.createElement('div'); colL.className = 'dlg-match-col';
      const colR = document.createElement('div'); colR.className = 'dlg-match-col';
      function render() {
        wrap.querySelectorAll('.dlg-match-item').forEach((node) => {
          const side = node.dataset.side, i = Number(node.dataset.i);
          node.classList.toggle('active', side === 'l' && i === activeLeft);
          let badge = '';
          if (side === 'l' && conn[i] != null) badge = String(Object.keys(conn).indexOf(String(i)) + 1);
          if (side === 'r') { const li = Object.keys(conn).find((k) => conn[k] === i); if (li != null) badge = String(Object.keys(conn).indexOf(li) + 1); }
          node.classList.toggle('connected', !!badge);
          node.querySelector('.dlg-match-badge').textContent = badge;
        });
      }
      function item(text, side, i) {
        const b = document.createElement('button'); b.type = 'button'; b.className = 'dlg-match-item'; b.dataset.side = side; b.dataset.i = i;
        b.innerHTML = `<span>${escapeHtml(text)}</span><span class="dlg-match-badge"></span>`;
        b.addEventListener('click', () => {
          if (cur.solved || cur.revealed) return;
          if (side === 'l') { activeLeft = (conn[i] != null) ? (delete conn[i], -1) : i; }
          else if (activeLeft >= 0) { Object.keys(conn).forEach((k) => { if (conn[k] === i) delete conn[k]; }); conn[activeLeft] = i; activeLeft = -1; }
          render();
        });
        return b;
      }
      left.forEach((t, i) => colL.appendChild(item(t, 'l', i)));
      right.forEach((t, i) => colR.appendChild(item(t, 'r', i)));
      wrap.append(colL, colR); r.playfield.appendChild(wrap);
      return {
        collect: () => ({ pairs: Object.entries(conn).map(([li, ri]) => [left[li], right[ri]]) }),
        lock: () => wrap.querySelectorAll('.dlg-match-item').forEach((b) => { b.disabled = true; }),
        mark: (data) => {
          if (data.solution) { const s = document.createElement('p'); s.className = 'dlg-mini reveal'; s.textContent = 'Lösung: ' + data.solution.map((p) => `${p[0]} → ${p[1]}`).join(' · '); wrap.parentElement.appendChild(s); }
        }
      };
    },

    regex(task) {
      const input = document.createElement('input');
      input.type = 'text'; input.className = 'dlg-regex-input'; input.placeholder = 'Regex-Muster …';
      input.autocomplete = 'off'; input.spellcheck = false;
      const list = document.createElement('div'); list.className = 'dlg-regex-samples';
      const samples = task.samples || [];
      function preview() {
        let pat = null;
        try { pat = input.value ? new RegExp(input.value) : null; } catch (e) { pat = null; }
        list.innerHTML = samples.map((s) => {
          const matches = pat ? pat.test(s.text) : false;
          const ok = matches === s.shouldMatch;
          const want = s.shouldMatch ? 'soll matchen' : 'soll nicht matchen';
          return `<span class="dlg-sample ${ok ? 'ok' : 'bad'}">${escapeHtml(s.text === '' ? '∅ (leer)' : s.text)}<small>${want}</small></span>`;
        }).join('');
      }
      input.addEventListener('input', preview);
      input.addEventListener('keydown', (e) => { if (e.key === 'Enter') { e.preventDefault(); doCheck(false); } });
      const wrap = document.createElement('div'); wrap.className = 'dlg-regex';
      wrap.append(input, list); r.playfield.appendChild(wrap); preview(); input.focus();
      return {
        collect: () => ({ pattern: input.value }),
        lock: () => { input.disabled = true; },
        mark: (data) => { if (data.solution) { const s = document.createElement('p'); s.className = 'dlg-mini reveal'; s.textContent = 'Lösung: ' + data.solution; wrap.appendChild(s); } }
      };
    }
  };

  // ---------- Ablauf ----------
  function renderTask() {
    const task = session.tasks[index];
    cur = { task, attempts: 0, solved: false, revealed: false };
    r.kind.textContent = `Aufgabe ${index + 1}`;
    r.mech.textContent = MECH_LABEL[task.type] || task.type;
    r.points.textContent = String(task.points || 100);
    r.prompt.textContent = task.prompt || '';
    r.narrative.textContent = task.narrative || '';
    r.narrative.hidden = !task.narrative;
    r.instruction.textContent = task.instruction || '';
    r.instruction.hidden = !task.instruction;
    r.feedback.textContent = ''; r.feedback.className = 'dlg-feedback';
    r.success.hidden = true; r.success.textContent = '';
    r.check.hidden = false; r.hint.hidden = !task.hint; r.reveal.hidden = true; r.next.hidden = true;
    r.playfield.innerHTML = '';
    const renderer = RENDERERS[task.type];
    cur.ctrl = renderer ? renderer(task) : { collect: () => ({}), lock: () => {}, mark: () => {} };
    updateHud();
  }

  async function doCheck(reveal) {
    if (!running || !cur || cur.solved) return;
    if (!reveal) cur.attempts++;
    const submission = cur.ctrl.collect();
    let data;
    try {
      const res = await fetch('/api/devlab/check', {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ taskId: cur.task.taskId, reveal, submission })
      });
      data = await res.json();
    } catch (err) { r.feedback.textContent = 'Prüfung fehlgeschlagen.'; r.feedback.className = 'dlg-feedback wrong'; return; }

    cur.lastSubmission = submission;
    cur.ctrl.mark(data);

    if (data.correct) {
      cur.solved = true;
      score += awarded(cur.task.points || 100, cur.attempts);
      cur.ctrl.lock();
      r.feedback.textContent = 'Richtig. Sitzt!'; r.feedback.className = 'dlg-feedback correct';
      finishMissionUi(data, false);
    } else if (reveal) {
      cur.revealed = true;
      cur.ctrl.lock();
      r.feedback.textContent = 'Aufgelöst – schau dir die Lösung an, dann weiter.'; r.feedback.className = 'dlg-feedback revealed';
      finishMissionUi(data, true);
    } else {
      const hint = cur.task.hint ? ` Hinweis: ${cur.task.hint}` : '';
      r.feedback.textContent = (data.error || 'Noch nicht ganz.') + hint; r.feedback.className = 'dlg-feedback wrong';
      if (cur.attempts >= MAX_ATTEMPTS) r.reveal.hidden = false;
    }
    updateHud();
  }

  function finishMissionUi(data, revealed) {
    r.check.hidden = true; r.hint.hidden = true; r.reveal.hidden = true; r.next.hidden = false;
    if (data.successText) { r.success.textContent = data.successText; r.success.hidden = false; }
    r.next.focus();
  }

  function showHint() {
    if (!cur || !cur.task.hint) return;
    r.feedback.textContent = `Hinweis: ${cur.task.hint}`; r.feedback.className = 'dlg-feedback revealed';
    score = Math.max(0, score - 10); updateHud();
  }

  function nextTask() {
    finishItems.push({ taskId: cur.task.taskId, submission: cur.lastSubmission || cur.ctrl.collect(), attempts: cur.attempts || 1, revealed: cur.revealed });
    index++;
    if (index >= session.tasks.length) finish();
    else renderTask();
  }

  async function finish() {
    running = false; stopTimer();
    try {
      const res = await fetch('/api/devlab/finish', {
        method: 'POST', headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ slug, durationSeconds: seconds, items: finishItems })
      });
      const data = await res.json();
      score = data.score; updateHud();
      r.resultStars.textContent = starString(data.stars);
      r.resultScore.textContent = String(data.score);
      r.resultMax.textContent = String(data.maxScore);
      r.resultDetail.textContent = `${data.solvedTasks} von ${data.totalTasks} auf Anhieb · ${formatTime(seconds)}`;
      r.resultHigh.hidden = !data.newHighscore;
      r.best.textContent = String(data.highscore);
      r.result.hidden = false;
    } catch (err) { console.error('Abschluss fehlgeschlagen', err); }
  }

  async function loadStats() {
    try {
      const res = await fetch(`/api/games/${GAME}/stats`);
      if (!res.ok) return;
      const s = await res.json();
      r.best.textContent = s.highscore > 0 ? String(s.highscore) : '–';
      r.bestLine.textContent = s.highscore > 0 ? `Dev-Lab-Bestwert: ${s.highscore} Punkte` : 'Noch kein Dev-Lab-Bestwert.';
    } catch (err) { /* egal */ }
  }

  function start() {
    index = 0; score = 0; seconds = 0; finishItems = []; r.time.textContent = '0:00'; r.result.hidden = true;
    running = true; renderTask(); startTimer();
  }

  async function init() {
    try {
      const res = await fetch(`/api/devlab/games/${encodeURIComponent(slug)}/session`);
      session = await res.json();
    } catch (err) { session = null; }
    if (!session || !session.found || !session.tasks || !session.tasks.length) {
      r.title.textContent = 'Spiel nicht gefunden';
      r.prompt.textContent = 'Für diese Disziplin gibt es noch keine Aufgaben.';
      r.check.hidden = true; r.hint.hidden = true;
      return;
    }
    document.title = `${session.title} – SysnaptiK Neural`;
    r.title.textContent = session.title;
    r.language.textContent = session.language || 'Dev Lab';
    r.sideTitle.textContent = session.title;
    r.description.textContent = session.description || '';
    loadStats();
    start();
  }

  r.check.addEventListener('click', () => doCheck(false));
  r.hint.addEventListener('click', showHint);
  r.reveal.addEventListener('click', () => doCheck(true));
  r.next.addEventListener('click', nextTask);
  r.again.addEventListener('click', start);
  init();
})();