/* Suggestions tab — Discord-forum-style board.
   - Overview = just the list of suggestions (full width). Click one → it opens the
     discussion beside it; "← Back" returns to the full-width overview.
   - Agree (upvote) on posts only, as a clear pill button.
   - Mod actions via right-click context menu (delete / set status; delete comment).
   - Live for everyone on the tab via SSE (posts, comments, votes, status, deletes) —
     applied incrementally so sending/receiving never scroll-jumps to the top. */
(function(){
'use strict';

const STATUS = {
  open:        {label:'Open',        color:'#5fc8ff'},
  planned:     {label:'Planned',     color:'#b060ff'},
  implemented: {label:'Implemented', color:'#22c55e'},
  declined:    {label:'Declined',    color:'#ff6b6b'},
  closed:      {label:'Closed',      color:'#8aa0b8'},
};
let MOD=false, sort='top', posts=[], selectedId=null, total=0, loading=false, _es=null;

function esc(s){ return String(s==null?'':s).replace(/[&<>"]/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;'}[c])); }
function uid(){
  let v=''; try{ v=localStorage.getItem('sm_fb_uid')||''; }catch(e){}
  if(!v){ v='u'+Math.random().toString(36).slice(2)+Date.now().toString(36); try{ localStorage.setItem('sm_fb_uid',v); }catch(e){} }
  return v;
}
function savedName(){ try{ return localStorage.getItem('sm_fb_name')||''; }catch(e){ return ''; } }
function rememberName(n){ try{ localStorage.setItem('sm_fb_name', n||''); }catch(e){} }
function nameField(){ const el=document.getElementById('fb-name'); const n=el?el.value.trim():''; rememberName(n); return n; }
function timeAgo(ts){
  const s=Math.max(0,(Date.now()/1000)-(Number(ts)||0));
  if(s<60)return 'just now';
  const m=s/60; if(m<60)return Math.floor(m)+'m ago';
  const h=m/60; if(h<24)return Math.floor(h)+'h ago';
  const d=h/24; if(d<30)return Math.floor(d)+'d ago';
  try{ return new Date((Number(ts)||0)*1000).toLocaleDateString(); }catch(e){ return Math.floor(d)+'d ago'; }
}
async function api(path,opts){
  const r=await fetch(path,opts); let data=null; try{ data=await r.json(); }catch(e){}
  if(!r.ok){ throw new Error((data&&(data.detail||data.error))||('HTTP '+r.status)); }
  return data;
}
function setMod(v){ if(v!=null) MOD = !!v || !!window.SM_IS_MOD; }
const RANK={open:0,planned:1,implemented:2,declined:3,closed:4};
function rank(p){ const r=RANK[p&&p.status]; return r!=null?r:5; }
function cmp(a,b){
  const ra=rank(a), rb=rank(b); if(ra!==rb)return ra-rb;   // open, then planned, then implemented/declined/closed
  return sort==='new' ? (b.created||0)-(a.created||0) : ((b.score-a.score)||((b.created||0)-(a.created||0)));
}
function setCount(){ const c=document.getElementById('fb-count'); if(c)c.textContent=total+' suggestion'+(total===1?'':'s'); }
function splitEl(){ return document.querySelector('#tab-feedback .fb-split'); }

function badge(status){ const s=STATUS[status]||STATUS.open;
  return `<span class="fb-badge" style="--fb-badge:${s.color}">${esc(s.label)}</span>`; }
function agreeBtn(id,score,voted,big){
  return `<button class="fb-agree${voted?' agreed':''}${big?' big':''}" data-vk="post-${id}" onclick="fbVote(event,${id})"
    title="${voted?'You agree — click to undo':'Agree with this suggestion'}">
    <span class="fb-agree-ic">👍</span><span class="fb-agree-txt">${voted?'Agreed':'Agree'}</span><span class="fb-agree-n">${score}</span></button>`;
}
function preview(body){ const t=String(body||'').replace(/\s+/g,' ').trim(); return t.length>90?esc(t.slice(0,90))+'…':esc(t); }

// ── list (overview) ──────────────────────────────────────────────────────────
function listRow(p){
  return `<div class="fb-row${p.id===selectedId?' sel':''}${rank(p)>=2?' dimmed':''}" id="fb-row-${p.id}" onclick="fbSelect(${p.id})" oncontextmenu="return fbRowMenu(event,${p.id})">
    <div class="fb-row-main">
      <div class="fb-row-head"><span class="fb-row-title">${esc(p.title)}</span>${badge(p.status)}</div>
      <div class="fb-row-prev">${preview(p.body)}</div>
      <div class="fb-row-meta">${esc(p.author)} · ${timeAgo(p.created)} · 💬 ${p.comments}</div>
    </div>
    ${agreeBtn(p.id,p.score,p.voted,false)}
  </div>`;
}
function renderList(){
  const host=document.getElementById('fb-list'); if(!host)return;
  if(loading){ host.innerHTML='<div class="fb-empty">Loading…</div>'; return; }
  if(!posts.length){ host.innerHTML='<div class="fb-empty">No suggestions yet — be the first!</div>'; return; }
  host.innerHTML=posts.map(listRow).join('');
}
function fbRerenderRow(id){ const el=document.getElementById('fb-row-'+id); const p=posts.find(x=>x.id===id); if(el&&p)el.outerHTML=listRow(p); }

// ── detail (discussion) ──────────────────────────────────────────────────────
function commentCard(c){
  return `<div class="fb-c${MOD?' mod':''}" id="fb-c-${c.id}"${MOD?` oncontextmenu="return fbCommentMenu(event,${c.id})"`:''}>
    <div class="fb-c-meta">${esc(c.author)}${c.own?' <span class="fb-you">you</span>':''} · ${timeAgo(c.created)}</div>
    <div class="fb-text">${esc(c.body)}</div>
  </div>`;
}
async function renderDetail(){
  const host=document.getElementById('fb-detail'); if(!host)return;
  if(selectedId==null){ host.innerHTML=''; return; }
  const want=selectedId;
  host.innerHTML='<div class="fb-empty">Loading…</div>';
  let d;
  try{ d=await api('/feedback/post/'+want+'?uid='+encodeURIComponent(uid())); }
  catch(e){ if(selectedId===want)host.innerHTML=`<div class="fb-empty">Error: ${esc(e.message)}</div>`; return; }
  if(selectedId!==want)return;   // user switched/closed while loading
  setMod(d.is_mod);
  // open UND planned bleiben kommentierbar (aktive Ideen, an denen man weiterdenkt);
  // erst implemented/declined/closed sperren fuer Nicht-Mods (Server erzwingt dasselbe).
  const locked=(d.status!=='open' && d.status!=='planned'), comments=d.commentList||[];
  const composer=(locked && !MOD)
    ? `<div class="fb-locked">🔒 This suggestion is closed for new comments.</div>`
    : `<div class="fb-c-new">
        <textarea id="fb-c-body" class="fb-input" rows="2" maxlength="2000" placeholder="Add a comment…  (Enter to send · Shift+Enter = new line)"></textarea>
        <div style="text-align:right"><button class="fb-post-btn" onclick="fbAddComment()">Comment</button></div>
      </div>`;
  host.innerHTML=`
    <div class="fb-d-scroll">
      <div style="display:flex;align-items:center;gap:10px;margin-bottom:10px">
        <button class="fb-back" onclick="fbClose()">← Back</button>
        ${MOD?'<span class="fb-modhint">right-click a suggestion or comment for mod actions</span>':''}
      </div>
      <div class="fb-d-head" oncontextmenu="return fbRowMenu(event,${d.id})">
        ${agreeBtn(d.id,d.score,d.voted,true)}
        <div style="min-width:0;flex:1">
          <div class="fb-d-title-row"><span class="fb-d-title">${esc(d.title)}</span><span id="fb-dbadge">${badge(d.status)}</span></div>
          <div class="fb-meta">by <b>${esc(d.author)}</b>${d.own?' <span class="fb-you">you</span>':''} · ${timeAgo(d.created)}</div>
        </div>
      </div>
      <div class="fb-text fb-d-body" oncontextmenu="return fbRowMenu(event,${d.id})">${esc(d.body)}</div>
      <div class="fb-c-wrap">
        <div class="fb-c-count" id="fb-ccount-wrap">${comments.length} comment${comments.length===1?'':'s'}</div>
        <div id="fb-clist">${comments.map(commentCard).join('')||'<div class="fb-empty small">No comments yet — start the discussion.</div>'}</div>
      </div>
    </div>
    <div class="fb-composer">${composer}</div>`;
  const ta=document.getElementById('fb-c-body');
  if(ta)ta.addEventListener('keydown',e=>{ if(e.key==='Enter'&&!e.shiftKey){ e.preventDefault(); fbAddComment(); } });
}
function fbUpdateCCount(){
  const list=document.getElementById('fb-clist'), wrap=document.getElementById('fb-ccount-wrap');
  if(!list||!wrap)return;
  const n=list.querySelectorAll('.fb-c').length;
  wrap.textContent=n+' comment'+(n===1?'':'s');
}
function fbAppendComment(c, own){   // append a node in place — no full re-render, so no scroll jump
  if(selectedId==null||c.post_id!==selectedId)return;
  const list=document.getElementById('fb-clist'); if(!list)return;
  if(document.getElementById('fb-c-'+c.id))return;   // dedupe (own optimistic + SSE echo)
  const sc=document.querySelector('#tab-feedback .fb-d-scroll');
  const near = sc ? (sc.scrollHeight - sc.scrollTop - sc.clientHeight < 90) : false;
  const empty=list.querySelector('.fb-empty'); if(empty)empty.remove();
  const tmp=document.createElement('div'); tmp.innerHTML=commentCard(c).trim();
  if(tmp.firstChild)list.appendChild(tmp.firstChild);
  fbUpdateCCount();
  // follow to the newest when YOU sent it, or when you're already at the bottom;
  // the composer itself stays pinned — only the message area scrolls
  if(sc && (own||near)) sc.scrollTop=sc.scrollHeight;
}
function fbUpdateScore(id,score){ document.querySelectorAll('[data-vk="post-'+id+'"] .fb-agree-n').forEach(n=>n.textContent=score); }
function syncAgree(id,score,voted){
  document.querySelectorAll('[data-vk="post-'+id+'"]').forEach(b=>{
    b.classList.toggle('agreed',!!voted);
    const n=b.querySelector('.fb-agree-n'); if(n)n.textContent=score;
    const t=b.querySelector('.fb-agree-txt'); if(t)t.textContent=voted?'Agreed':'Agree';
  });
}
function fbBumpRowComments(postId,delta){ const p=posts.find(x=>x.id===postId); if(p){ p.comments=Math.max(0,(p.comments||0)+delta); fbRerenderRow(postId); } }

// ── mod right-click context menu ─────────────────────────────────────────────
function fbHideMenu(){ const m=document.getElementById('fb-ctx'); if(m)m.remove(); }
function fbShowMenu(x,y,items){
  fbHideMenu();
  const m=document.createElement('div'); m.id='fb-ctx';
  m.style.cssText='position:fixed;z-index:99999;background:var(--panel,#0c1626);border:1px solid var(--border,#22304c);border-radius:10px;padding:5px;box-shadow:0 10px 30px rgba(0,0,0,.55);min-width:196px;font-size:13px';
  m.innerHTML=items.map((it,i)=>it.sep?'<div style="height:1px;background:var(--border,#22304c);margin:5px 4px"></div>':
    `<div class="fb-ctx-item" data-i="${i}" style="padding:7px 12px;border-radius:6px;cursor:pointer;color:${it.danger?'var(--red,#ff6b6b)':'var(--text)'}">${esc(it.label)}</div>`).join('');
  document.body.appendChild(m);
  const r=m.getBoundingClientRect();
  m.style.left=Math.max(6,Math.min(x,window.innerWidth-r.width-8))+'px';
  m.style.top=Math.max(6,Math.min(y,window.innerHeight-r.height-8))+'px';
  m.querySelectorAll('[data-i]').forEach(el=>{ el.onclick=e=>{ e.stopPropagation(); const it=items[+el.dataset.i]; fbHideMenu(); if(it&&it.fn)it.fn(); }; });
}
window.fbRowMenu=function(ev,id){
  if(!MOD)return true;                 // non-mods keep the normal browser menu
  ev.preventDefault(); ev.stopPropagation();
  const p=posts.find(x=>x.id===id)||{};
  const items=[{label:'🗑  Delete suggestion',danger:true,fn:()=>fbModDelete(id)},{sep:true}];
  Object.keys(STATUS).forEach(k=>items.push({label:(p.status===k?'●  ':'○  ')+'Status: '+STATUS[k].label,fn:()=>fbModStatus(id,k)}));
  fbShowMenu(ev.clientX,ev.clientY,items);
  return false;
};
window.fbCommentMenu=function(ev,id){
  if(!MOD)return true;
  ev.preventDefault(); ev.stopPropagation();
  fbShowMenu(ev.clientX,ev.clientY,[{label:'🗑  Delete comment',danger:true,fn:()=>fbModDeleteComment(id)}]);
  return false;
};
document.addEventListener('click',fbHideMenu);
window.addEventListener('scroll',fbHideMenu,true);
window.addEventListener('resize',fbHideMenu);

// ── actions ──────────────────────────────────────────────────────────────────
window.fbSelect=function(id){ selectedId=id; const sp=splitEl(); if(sp)sp.classList.toggle('has-sel',id!=null); renderList(); renderDetail(); };
window.fbClose=function(){ selectedId=null; const sp=splitEl(); if(sp)sp.classList.remove('has-sel'); const d=document.getElementById('fb-detail'); if(d)d.innerHTML=''; renderList(); };
window.fbSetSort=function(s){
  sort=(s==='new')?'new':'top';
  const t=document.getElementById('fb-sort-top'), n=document.getElementById('fb-sort-new');
  if(t)t.classList.toggle('active',sort==='top'); if(n)n.classList.toggle('active',sort==='new');
  loadFeedback();
};
window.loadFeedback=async function(){
  fbOpenStream();
  loading=true; renderList();
  try{
    const data=await api('/feedback/posts?sort='+sort+'&uid='+encodeURIComponent(uid()));
    posts=data.posts||[]; posts.sort(cmp); total=(data.total!=null?data.total:posts.length); setMod(data.is_mod); setCount();
  }catch(e){ loading=false; posts=[]; const host=document.getElementById('fb-list'); if(host)host.innerHTML=`<div class="fb-empty">Error: ${esc(e.message)}</div>`; return; }
  loading=false;
  const sp=splitEl(); if(sp)sp.classList.toggle('has-sel',selectedId!=null);
  renderList();
  if(selectedId!=null)renderDetail();
};
window.fbCreatePost=async function(){
  const st=document.getElementById('fb-form-status');
  const title=(document.getElementById('fb-title')||{}).value||'';
  const body=(document.getElementById('fb-body')||{}).value||'';
  if(title.trim().length<3){ if(st){st.style.color='#ffb454';st.textContent='Title needs at least 3 characters.';} return; }
  if(!body.trim()){ if(st){st.style.color='#ffb454';st.textContent='Please add some detail.';} return; }
  if(st){ st.style.color='var(--text2)'; st.textContent='Posting…'; }
  let created;
  try{ created=await api('/feedback/post',{method:'POST',headers:{'Content-Type':'application/json'},
    body:JSON.stringify({title,body,author:nameField(),uid:uid()})}); }
  catch(e){ if(st){st.style.color='#ffb454';st.textContent='Error: '+e.message;} return; }
  document.getElementById('fb-title').value=''; document.getElementById('fb-body').value='';
  if(st){ st.style.color='var(--green)'; st.textContent='Posted!'; setTimeout(()=>{if(st)st.textContent='';},2000); }
  if(created&&created.id!=null){ if(!posts.some(p=>p.id===created.id)){ posts.push(created); total++; setCount(); } posts.sort(cmp); fbSelect(created.id); }
};
window.fbVote=async function(ev,id){
  if(ev){ ev.stopPropagation(); ev.preventDefault(); }   // don't also open/select the row
  let res;
  try{ res=await api('/feedback/vote',{method:'POST',headers:{'Content-Type':'application/json'},
    body:JSON.stringify({kind:'post',target_id:id,uid:uid()})}); }
  catch(e){ return; }
  syncAgree(id,res.score,res.voted);
  const p=posts.find(x=>x.id===id); if(p){ p.score=res.score; p.voted=res.voted; }
};
window.fbAddComment=async function(){
  if(selectedId==null)return;
  const ta=document.getElementById('fb-c-body'); const body=ta?ta.value:'';
  if(!body.trim())return;
  let c;
  try{ c=await api('/feedback/comment',{method:'POST',headers:{'Content-Type':'application/json'},
    body:JSON.stringify({post_id:selectedId,body,author:nameField(),uid:uid()})}); }
  catch(e){ alert('Error: '+e.message); return; }
  if(ta){ ta.value=''; ta.focus(); }
  fbAppendComment(c, true); fbBumpRowComments(selectedId,+1);   // own send -> follow to newest; SSE echo dedupes
};
window.fbModStatus=async function(postId,status){
  try{ await api('/feedback/mod/status',{method:'POST',headers:{'Content-Type':'application/json'},
    body:JSON.stringify({post_id:postId,status})}); }
  catch(e){ alert('Error: '+e.message); return; }
  const p=posts.find(x=>x.id===postId); if(p)p.status=status;
  posts.sort(cmp); renderList();   // may move it into the grayed group at the bottom
  if(selectedId===postId){ const b=document.getElementById('fb-dbadge'); if(b)b.innerHTML=badge(status); }
};
window.fbModDelete=async function(postId){
  if(!confirm('Delete this suggestion and all its comments? This cannot be undone.'))return;
  try{ await api('/feedback/mod/delete',{method:'POST',headers:{'Content-Type':'application/json'},
    body:JSON.stringify({post_id:postId})}); }
  catch(e){ alert('Error: '+e.message); return; }
  posts=posts.filter(x=>x.id!==postId); total=Math.max(0,total-1); setCount();
  if(selectedId===postId) fbClose(); else renderList();
};
window.fbModDeleteComment=async function(commentId){
  if(!confirm('Delete this comment?'))return;
  try{ await api('/feedback/mod/delete',{method:'POST',headers:{'Content-Type':'application/json'},
    body:JSON.stringify({comment_id:commentId})}); }
  catch(e){ alert('Error: '+e.message); return; }
  const el=document.getElementById('fb-c-'+commentId); if(el)el.remove();
  fbUpdateCCount();
  if(selectedId!=null) fbBumpRowComments(selectedId,-1);
};

// ── live stream (SSE) ────────────────────────────────────────────────────────
function fbOpenStream(){
  if(_es || typeof EventSource==='undefined')return;
  try{ _es=new EventSource('/feedback/stream'); }catch(e){ _es=null; return; }
  _es.addEventListener('fb',ev=>{ let d; try{ d=JSON.parse(ev.data); }catch(e){ return; } fbApplyEvent(d); });
}
window.fbCloseStream=function(){ if(_es){ try{ _es.close(); }catch(e){} _es=null; } };
function fbApplyEvent(d){
  if(!d||!d.type)return;
  if(d.type==='post'){
    const p=d.post; if(!p||posts.some(x=>x.id===p.id))return;
    posts.push(p); posts.sort(cmp); total++; setCount(); if(!loading)renderList();
  } else if(d.type==='comment'){
    const c=d.comment; if(!c)return;
    if(selectedId===c.post_id) fbAppendComment(c);
    fbBumpRowComments(c.post_id,+1);
  } else if(d.type==='vote'){
    if(d.kind!=='post')return;
    fbUpdateScore(d.target_id,d.score);
    const p=posts.find(x=>x.id===d.target_id); if(p)p.score=d.score;
  } else if(d.type==='status'){
    const p=posts.find(x=>x.id===d.post_id); if(p)p.status=d.status;
    posts.sort(cmp); renderList();
    if(selectedId===d.post_id){ const b=document.getElementById('fb-dbadge'); if(b)b.innerHTML=badge(d.status); }
  } else if(d.type==='delete'){
    posts=posts.filter(x=>x.id!==d.post_id); total=Math.max(0,total-1); setCount();
    if(selectedId===d.post_id) fbClose(); else renderList();
  } else if(d.type==='comment_delete'){
    const el=document.getElementById('fb-c-'+d.comment_id); if(el){ el.remove(); fbUpdateCCount(); }
    if(d.post_id!=null) fbBumpRowComments(d.post_id,-1);
  }
}

document.addEventListener('DOMContentLoaded',()=>{ const el=document.getElementById('fb-name'); if(el)el.value=savedName(); });
})();