// 主控：鉴权 / 事件列表 / 加载保存 / 校验 / 状态 / 导入导出 / 试走。
(function () {
  const App = {
    dict: { conditions: {}, grants: {} },
    pointsets: {},        // name -> {mapId, points:[]}
    events: [],
    current: null,        // 当前 group
    ir: null,             // 工作副本
    status: null,
    selectedNode: null,
    dirty: false,
    by: localStorage.getItem("story_by") || "匿名",
  };
  window.App = App;

  const $ = id => document.getElementById(id);
  async function api(path, opts) {
    const r = await fetch(path, Object.assign({ headers: { "Content-Type": "application/json" } }, opts));
    if (r.status === 401) { showLogin(); throw new Error("未授权"); }
    return r;
  }

  // ---------- 鉴权 ----------
  function showLogin() { $("login").classList.remove("hidden"); $("login").style.display = "flex"; }
  function hideLogin() { $("login").style.display = "none"; }

  $("login-btn").onclick = async () => {
    const pass = $("login-pass").value, name = $("login-name").value.trim();
    const r = await fetch("/api/login", { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ password: pass }) });
    if (!r.ok) { $("login-err").textContent = "口令错误"; return; }
    if (name) { App.by = name; localStorage.setItem("story_by", name); }
    hideLogin(); init();
  };
  $("login-pass").onkeydown = e => { if (e.key === "Enter") $("login-btn").click(); };

  // ---------- 初始化 ----------
  async function init() {
    $("who").textContent = "你：" + App.by;
    try {
      App.dict = await (await api("/api/dictionary")).json();
      App.pointsets = await (await api("/api/pointsets")).json();
    } catch (e) { return; }
    await loadList();
  }

  // ---------- 列表 ----------
  async function loadList() {
    const status = $("filter-status").value;
    const r = await api("/api/events?status=" + encodeURIComponent(status));
    App.events = await r.json();
    renderList();
  }
  function renderList() {
    const q = $("search").value.trim().toLowerCase();
    const host = $("event-list"); host.innerHTML = "";
    const badge = { pending: ["b-pending", "待审"], confirmed: ["b-confirmed", "已确认"], discarded: ["b-discarded", "已丢弃"] };
    App.events
      .filter(e => !q || (e.title || "").toLowerCase().includes(q) || (e.group || "").toLowerCase().includes(q))
      .forEach(e => {
        const b = badge[e.status] || ["b-pending", e.status];
        const d = document.createElement("div");
        d.className = "ev" + (e.group === App.current ? " sel" : "");
        d.innerHTML = '<span class="badge ' + b[0] + '">' + b[1] + '</span>'
          + '<div class="t">' + esc(e.title || e.group) + '</div>'
          + '<div class="g">' + esc(e.group) + ' · ' + esc(e.updated_by || "") + ' ' + esc((e.updated_at || "").slice(5, 16)) + '</div>';
        d.onclick = () => selectEvent(e.group);
        host.appendChild(d);
      });
    if (!host.children.length) host.innerHTML = '<div class="empty" style="padding:14px">无事件，点「导入 IR」</div>';
  }
  $("filter-status").onchange = loadList;
  $("search").oninput = renderList;

  // ---------- 选中事件 ----------
  async function selectEvent(group) {
    if (App.dirty && !confirm("当前事件有未保存修改，放弃并切换？")) return;
    const r = await api("/api/events/" + encodeURIComponent(group));
    const d = await r.json();
    App.current = group; App.ir = JSON.parse(JSON.stringify(d.ir));
    App.status = d.status; App.selectedNode = null; App.dirty = false;
    $("graph-empty").style.display = "none";
    ["btn-save", "btn-validate", "btn-playtest", "btn-confirm", "btn-discard", "btn-addnode", "btn-autolayout", "btn-addsucc"].forEach(b => $(b).disabled = false);
    renderAll(true);
    GraphUI.focusStart(App.ir);     // 定位到开头节点
    snapReset();                    // 初始化撤销栈
    renderList();
    updateDirty();
  }

  const ctx = () => ({
    dict: App.dict,
    pointNames: (App.pointsets[(App.ir.stage || {}).point_set || App.ir.id] || {}).points || [],
    onChange: structural => {
      App.dirty = true; updateDirty();
      if (structural) { GraphUI.render(App.ir, App.selectedNode); FormUI.renderMeta(App.ir, ctx()); FormUI.renderNode(App.ir, App.selectedNode, ctx()); }
      else { GraphUI.updateLabel(App.ir, App.selectedNode); }
      scheduleSnapshot();
    },
    selectNode: id => { App.selectedNode = id; },
    deleteNode: id => deleteNode(id),
  });

  function selectNode(id) { App.selectedNode = id; GraphUI.select(id); FormUI.renderNode(App.ir, id, ctx()); }

  // 工具栏「加后继」：给当前选中节点建一个后继并自动接线（无选中则忽略）
  function addSuccessor(id) {
    const r = FormUI.addSuccessor(App.ir, id);
    if (!r) return;
    if (!r.linked) alert("该战斗节点的「胜→win」「败→lose」出口都已占用，\n新节点已创建但未自动接线——请在右栏把胜或败指向它（id: " + r.id + "）。");
    App.dirty = true; App.selectedNode = r.id;
    GraphUI.render(App.ir, r.id); FormUI.renderMeta(App.ir, ctx()); FormUI.renderNode(App.ir, r.id, ctx()); updateDirty();
  }
  // 纯数据删除节点/结局
  function removeFromIr(id) {
    App.ir.nodes = (App.ir.nodes || []).filter(n => n.id !== id);
    App.ir.endings = (App.ir.endings || []).filter(e => e.id !== id);
    if (App.ir._layout) delete App.ir._layout[id];
    if (App.selectedNode === id) App.selectedNode = null;
    App.dirty = true; updateDirty();
  }
  // 线性节点的唯一后继（多出口/结局返回 null，不缝合）
  function uniqueSuccessor(node) {
    if (!node) return null;
    const k = node.kind;
    if (k === "choice" || k === "choice_once" || k === "random" || k === "fight") return null;
    if ((App.ir.endings || []).some(e => e.id === node.id)) return null;
    return node.next || null;
  }
  // 把所有指向 from 的跳转改接到 to
  function retarget(from, to) {
    (App.ir.nodes || []).forEach(n => {
      if (n.next === from) n.next = to;
      if (n.win === from) n.win = to;
      if (n.lose === from) n.lose = to;
      (n.options || []).forEach(o => { if (o.goto === from) o.goto = to; if (o.skip && o.skip.node === from) o.skip.node = to; });
      (n.branches || []).forEach(b => { if (b.goto === from) b.goto = to; });
    });
  }
  // 删除节点：若是线性中间节点，删除后把前驱缝合到它的后继
  function deleteNode(id) {
    const node = (App.ir.nodes || []).find(n => n.id === id);
    const succ = uniqueSuccessor(node);
    if (succ && succ !== id) retarget(id, succ);
    removeFromIr(id);
    renderAll(); scheduleSnapshot();
  }
  function renderAll() { GraphUI.render(App.ir, App.selectedNode); FormUI.renderMeta(App.ir, ctx()); FormUI.renderNode(App.ir, App.selectedNode, ctx()); }

  function updateDirty() {
    $("btn-save").textContent = App.dirty ? "保存 *" : "保存";
    $("who").textContent = "你：" + App.by + (App.current ? ("　|　" + App.current + "（" + (App.status || "") + "）") : "");
  }

  // ---------- 增节点 ----------
  $("btn-addnode").onclick = () => {
    if (!App.ir) return;
    const id = FormUI.newNode(App.ir);
    App.dirty = true; App.selectedNode = id;
    GraphUI.render(App.ir, id); FormUI.renderMeta(App.ir, ctx()); FormUI.renderNode(App.ir, id, ctx()); updateDirty();
  };

  // ---------- 保存 ----------
  $("btn-save").onclick = async () => {
    if (!App.ir) return;
    const r = await api("/api/events/" + encodeURIComponent(App.current), { method: "PUT", body: JSON.stringify({ ir: App.ir, by: App.by }) });
    if (r.ok) { App.dirty = false; updateDirty(); await loadList(); }
    else alert("保存失败：" + (await r.text()));
  };

  // ---------- 校验 ----------
  $("btn-validate").onclick = async () => {
    const r = await api("/api/validate", { method: "POST", body: JSON.stringify({ ir: App.ir }) });
    const d = await r.json();
    showValidate(d.errors || [], d.warnings || []);
  };
  function showValidate(errs, warns) {
    let h = "";
    if (!errs.length && !warns.length) h = '<div class="v-ok">✓ 校验通过，无错误无警告</div>';
    errs.forEach(e => h += '<div class="v-err">✗ ' + esc(e) + '</div>');
    warns.forEach(w => h += '<div class="v-warn">⚠ ' + esc(w) + '</div>');
    $("validate-body").innerHTML = h;
    $("validate-modal").classList.remove("hidden");
  }

  // ---------- 状态 ----------
  async function setStatus(s) {
    const r = await api("/api/events/" + encodeURIComponent(App.current) + "/status", { method: "POST", body: JSON.stringify({ status: s, by: App.by }) });
    if (r.ok) { App.status = s; updateDirty(); await loadList(); }
  }
  $("btn-confirm").onclick = () => setStatus("confirmed");
  $("btn-discard").onclick = () => setStatus("discarded");

  // ---------- 试走 ----------
  $("btn-playtest").onclick = () => Playtest.open(App.ir, App.dict);

  // ---------- 导入 ----------
  let importFiles = [];   // 当前已选文件
  function renderImportFiles() {
    const host = $("import-files"); host.innerHTML = "";
    importFiles.forEach((f, i) => {
      const d = document.createElement("div");
      d.className = "fileitem";
      d.innerHTML = '<span class="fn">' + esc(f.name) + '</span><span class="fsz">' + (f.size > 1024 ? (f.size / 1024).toFixed(1) + " KB" : f.size + " B") + '</span><button class="rm" title="移除">✕</button>';
      d.querySelector(".rm").onclick = () => { importFiles.splice(i, 1); renderImportFiles(); };
      host.appendChild(d);
    });
  }
  function addImportFiles(fileList) {
    for (const f of fileList) if (!importFiles.some(x => x.name === f.name && x.size === f.size)) importFiles.push(f);
    renderImportFiles();
  }
  $("btn-import").onclick = () => {
    importFiles = []; renderImportFiles();
    $("import-text").value = ""; $("import-result").textContent = "";
    $("import-modal").classList.remove("hidden");
  };
  $("import-drop").onclick = () => $("import-file").click();
  $("import-file").onchange = e => { addImportFiles(e.target.files); e.target.value = ""; };
  const drop = $("import-drop");
  ["dragenter", "dragover"].forEach(ev => drop.addEventListener(ev, e => { e.preventDefault(); drop.classList.add("over"); }));
  ["dragleave", "drop"].forEach(ev => drop.addEventListener(ev, e => { e.preventDefault(); drop.classList.remove("over"); }));
  drop.addEventListener("drop", e => { addImportFiles(e.dataTransfer.files); });

  async function collectImportEvents() {
    const events = [];
    for (const f of importFiles) {
      let text;
      try { text = await f.text(); } catch (e) { throw new Error(f.name + "：读取失败"); }
      let data;
      try { data = JSON.parse(text); } catch (e) { throw new Error(f.name + "：JSON 解析失败 " + e.message); }
      (Array.isArray(data) ? data : [data]).forEach(x => events.push(x));
    }
    const pasted = $("import-text").value.trim();
    if (pasted) {
      let data;
      try { data = JSON.parse(pasted); } catch (e) { throw new Error("粘贴文本：JSON 解析失败 " + e.message); }
      (Array.isArray(data) ? data : [data]).forEach(x => events.push(x));
    }
    return events;
  }

  $("import-do").onclick = async () => {
    $("import-result").textContent = "";
    let events;
    try { events = await collectImportEvents(); } catch (e) { $("import-result").textContent = e.message; return; }
    if (!events.length) { $("import-result").textContent = "请先选择文件或粘贴 JSON"; return; }
    const r = await api("/api/import", { method: "POST", body: JSON.stringify({ events, by: App.by }) });
    const d = await r.json();
    importFiles = []; renderImportFiles(); $("import-text").value = "";
    $("import-modal").classList.add("hidden");              // 导入完直接关闭
    const ne = (d.errors || []).length;
    toast("已导入 " + (d.saved || []).length + " 个事件" + (ne ? "，" + ne + " 个跳过/出错" : ""));
    await loadList();
  };

  // ---------- 导出 ----------
  $("btn-export").onclick = async () => {
    const r = await api("/api/export", { method: "POST", body: JSON.stringify({}) });
    if (r.ok) {
      const blob = await r.blob();
      const a = document.createElement("a"); a.href = URL.createObjectURL(blob);
      a.download = "story_export.zip"; a.click();
    } else {
      const d = await r.json().catch(() => ({}));
      let msg = d.error || "导出失败";
      if (d.report) { for (const g in d.report) { const e = d.report[g].errors; if (e.length) msg += "\n[" + g + "] " + e.join("；"); } }
      alert(msg);
    }
  };

  // ---------- 遮罩关闭 ----------
  document.querySelectorAll(".modal-close").forEach(b => b.onclick = () => b.closest(".overlay").classList.add("hidden"));

  // ---------- 工具 ----------
  function esc(s) { return String(s == null ? "" : s).replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;"); }
  let toastTimer = null;
  function toast(msg) {
    let el = $("toast");
    if (!el) { el = document.createElement("div"); el.id = "toast"; document.body.appendChild(el); }
    el.textContent = msg; el.classList.add("show");
    clearTimeout(toastTimer);
    toastTimer = setTimeout(() => el.classList.remove("show"), 2600);
  }

  // ---------- 撤销 / 重做（Ctrl+Z / Ctrl+Y） ----------
  let undoStack = [], redoStack = [], snapTimer = null;
  function snapReset() { undoStack = App.ir ? [JSON.stringify(App.ir)] : []; redoStack = []; }
  function flushSnapshot() {
    if (!App.ir) return;
    const cur = JSON.stringify(App.ir);
    if (!undoStack.length || undoStack[undoStack.length - 1] !== cur) {
      undoStack.push(cur); if (undoStack.length > 60) undoStack.shift(); redoStack = [];
    }
  }
  function scheduleSnapshot() { clearTimeout(snapTimer); snapTimer = setTimeout(flushSnapshot, 450); }
  function restoreState(json) {
    App.ir = JSON.parse(json); App.selectedNode = null; App.dirty = true;
    renderAll(); updateDirty();
  }
  function undo() {
    flushSnapshot();
    if (undoStack.length < 2) return;
    redoStack.push(undoStack.pop());
    restoreState(undoStack[undoStack.length - 1]);
    toast("已撤销");
  }
  function redo() {
    if (!redoStack.length) return;
    const s = redoStack.pop(); undoStack.push(s); restoreState(s);
    toast("已重做");
  }
  document.addEventListener("keydown", e => {
    if (!(e.ctrlKey || e.metaKey) || !App.ir) return;
    const a = document.activeElement;
    if (a && (a.tagName === "INPUT" || a.tagName === "TEXTAREA")) return;   // 输入框内交给浏览器
    const k = e.key.toLowerCase();
    if (k === "z" && !e.shiftKey) { e.preventDefault(); undo(); }
    else if (k === "y" || (k === "z" && e.shiftKey)) { e.preventDefault(); redo(); }
  });

  // ---------- 画布工具栏 ----------
  $("btn-autolayout").onclick = () => {
    if (!App.ir) return;
    App.ir._layout = null;                 // 清坐标 → render 时按自动布局重排
    GraphUI.render(App.ir, App.selectedNode);
    App.dirty = true; updateDirty();
  };
  $("btn-addsucc").onclick = () => {
    if (!App.ir || !App.selectedNode) { alert("先在画布上点选一个节点，再点「加后继」。"); return; }
    addSuccessor(App.selectedNode);
  };

  // ---------- 启动 ----------
  GraphUI.init("drawflow", {
    onSelect: id => selectNode(id),
    onMove: (id, x, y) => { if (!App.ir) return; (App.ir._layout = App.ir._layout || {})[id] = { x: x, y: y }; App.dirty = true; updateDirty(); scheduleSnapshot(); },
    onConnect: () => { App.dirty = true; updateDirty(); FormUI.renderNode(App.ir, App.selectedNode, ctx()); scheduleSnapshot(); },
    onDisconnect: () => { App.dirty = true; updateDirty(); FormUI.renderNode(App.ir, App.selectedNode, ctx()); scheduleSnapshot(); },
    onDeleteSelected: id => deleteNode(id),
  });
  (async function () {
    try { const r = await fetch("/api/events?status=all"); if (r.status === 401) { showLogin(); return; } hideLogin(); init(); }
    catch (e) { showLogin(); }
  })();
})();