(function () {
  const data = window.CASE_DATA;
  const timeline = document.querySelector("#timeline");
  const filters = document.querySelector("#filters");
  let activeFilter = "all";
  let timelineView = "compact";
  let editing = false;
  const editStoreKey = "saigon-leverage-edits-v1";
  const themeStoreKey = "saigon-leverage-theme";

  document.querySelector("#episodeLabel").textContent = `CASE TIMELINE · ${data.episode}`;
  document.querySelector("#heroEyebrow").textContent = data.eyebrow;
  document.querySelector("#caseTitle").innerHTML = `${data.title.split("：")[0]}：<br><span>${data.title.split("：").slice(1).join("：")}</span>`;
  document.querySelector("#heroDeck").textContent = data.deck;
  document.querySelector("#heroDeck").dataset.edit = "hero-deck";

  document.querySelector("#heroMetrics").innerHTML = data.metrics.map((metric) => `
    <div class="metric"><strong data-edit="metric-${metric.label}-value">${metric.value}</strong><span data-edit="metric-${metric.label}-label">${metric.label}</span></div>
  `).join("");

  document.querySelector("#participantsGrid").innerHTML = data.participants.map((party) => `
    <article class="participant-card">
      <div class="participant-title"><span aria-hidden="true">${party.mark}</span><div><h3 data-edit="party-${party.mark}-name">${party.name}</h3><p data-edit="party-${party.mark}-role">${party.role}</p></div></div>
      <p data-edit="party-${party.mark}-stance">${party.stance}</p>
      <strong data-edit="party-${party.mark}-asset">${party.asset}</strong>
    </article>
  `).join("");

  function applyTimelineView() {
    timeline.classList.toggle("compact", timelineView === "compact");
    document.querySelectorAll("[data-view]").forEach((button) => {
      const active = button.dataset.view === timelineView;
      button.classList.toggle("active", active);
      button.setAttribute("aria-pressed", String(active));
    });
  }

  function renderFilters() {
    filters.innerHTML = data.categories.map((item) => `
      <button type="button" class="filter ${item.id === activeFilter ? "active" : ""}" data-filter="${item.id}">
        <i aria-hidden="true"></i>${item.label}
      </button>
    `).join("");
  }

  function renderTimeline() {
    const visible = activeFilter === "all" ? data.events : data.events.filter((event) => event.category === activeFilter);
    timeline.innerHTML = visible.map((event, position) => `
      <article class="event ${event.featured ? "featured" : ""}" id="${event.id}" data-category="${event.category}" style="--delay:${position * 35}ms">
        <div class="event-date"><span data-edit="event-${event.id}-date">${event.date}</span><small>${event.index}</small></div>
        <button class="event-card" type="button" aria-expanded="false" aria-controls="detail-${event.id}">
          <div class="event-card-top"><span class="tag">${categoryLabel(event.category)}</span><span class="expand-icon" aria-hidden="true">＋</span></div>
          <h3 data-edit="event-${event.id}-title">${event.title}</h3>
          <p data-edit="event-${event.id}-summary">${event.summary}</p>
          <strong class="event-stat" data-edit="event-${event.id}-stat">${event.stat}</strong>
          <div class="event-detail" id="detail-${event.id}">
            <div><span>商业含义</span><p data-edit="event-${event.id}-detail">${event.detail}</p></div>
            <div><span>关键影响</span><p data-edit="event-${event.id}-impact">${event.impact}</p></div>
          </div>
        </button>
      </article>
    `).join("");
    bindCards();
    applyTimelineView();
    restoreEdits();
    if (editing) setEditing(true);
  }

  function categoryLabel(id) {
    return data.categories.find((item) => item.id === id)?.label || id;
  }

  function bindCards() {
    document.querySelectorAll(".event-card").forEach((card) => {
      card.addEventListener("click", () => {
        if (editing) return;
        const expanded = card.getAttribute("aria-expanded") === "true";
        card.setAttribute("aria-expanded", String(!expanded));
        card.closest(".event").classList.toggle("open", !expanded);
      });
    });
  }

  filters.addEventListener("click", (event) => {
    const button = event.target.closest("[data-filter]");
    if (!button) return;
    activeFilter = button.dataset.filter;
    renderFilters();
    renderTimeline();
  });

  document.querySelector(".view-switch").addEventListener("click", (event) => {
    const button = event.target.closest("[data-view]");
    if (!button) return;
    timelineView = button.dataset.view;
    applyTimelineView();
  });

  document.querySelector("#chapterNav").innerHTML = data.chapters.map((chapter) => {
    const target = data.events.find((event) => event.chapter === chapter.id)?.id;
    return `<a href="#${target}"><span>${chapter.label.slice(0, 2)}</span>${chapter.label.slice(3)}</a>`;
  }).join("");

  document.querySelector("#modelGrid").innerHTML = data.model.map((item) => `
    <article class="model-card ${item.category}"><span>${item.num}</span><h3 data-edit="model-${item.num}-title">${item.title}</h3><strong data-edit="model-${item.num}-subtitle">${item.subtitle}</strong><p data-edit="model-${item.num}-body">${item.body}</p></article>
  `).join("");

  function storedEdits() {
    try { return JSON.parse(localStorage.getItem(editStoreKey)) || {}; } catch (_) { return {}; }
  }

  function restoreEdits() {
    const saved = storedEdits();
    document.querySelectorAll("[data-edit]").forEach((element) => {
      if (saved[element.dataset.edit] !== undefined) element.innerHTML = saved[element.dataset.edit];
    });
  }

  function saveEdit(element) {
    const saved = storedEdits();
    saved[element.dataset.edit] = element.innerHTML;
    localStorage.setItem(editStoreKey, JSON.stringify(saved));
  }

  function setEditing(next) {
    editing = next;
    document.body.classList.toggle("is-editing", editing);
    const editButton = document.querySelector("#editToggle");
    editButton.querySelector(".icon-glyph").textContent = editing ? "✓" : "✎";
    editButton.setAttribute("aria-label", editing ? "完成编辑" : "编辑页面内容");
    editButton.title = editing ? "完成编辑" : "编辑页面内容";
    document.querySelectorAll("[data-edit]").forEach((element) => {
      element.contentEditable = editing ? "true" : "false";
      element.spellcheck = editing;
    });
  }

  document.addEventListener("input", (event) => {
    const editable = event.target.closest("[data-edit]");
    if (editing && editable) saveEdit(editable);
  });

  document.querySelector("#editToggle").addEventListener("click", () => setEditing(!editing));
  document.querySelector("#resetEdits").addEventListener("click", () => {
    if (!confirm("确定恢复全部原稿吗？当前编辑内容将被清除。")) return;
    localStorage.removeItem(editStoreKey);
    location.reload();
  });

  function setTheme(theme) {
    document.documentElement.dataset.theme = theme;
    const themeButton = document.querySelector("#themeToggle");
    const nextTheme = theme === "dark" ? "浅色" : "深色";
    themeButton.querySelector(".icon-glyph").textContent = theme === "dark" ? "☼" : "☾";
    themeButton.setAttribute("aria-label", `切换至${nextTheme}模式`);
    themeButton.title = `切换至${nextTheme}模式`;
    document.querySelectorAll("img[data-dark-src]").forEach((image) => {
      image.src = theme === "dark" ? image.dataset.darkSrc : image.dataset.lightSrc;
    });
    localStorage.setItem(themeStoreKey, theme);
  }

  document.querySelector("#themeToggle").addEventListener("click", () => {
    setTheme(document.documentElement.dataset.theme === "dark" ? "light" : "dark");
  });

  document.querySelector("#copyLink").addEventListener("click", async (event) => {
    const button = event.currentTarget;
    try {
      await navigator.clipboard.writeText(location.href);
      button.classList.add("is-copied");
      button.querySelector(".icon-glyph").textContent = "✓";
      button.setAttribute("aria-label", "链接已复制");
      button.title = "链接已复制";
      setTimeout(() => {
        button.classList.remove("is-copied");
        button.querySelector(".icon-glyph").textContent = "⤴";
        button.setAttribute("aria-label", "复制当前页面链接");
        button.title = "复制当前页面链接";
      }, 1600);
    } catch (_) {
      button.querySelector(".icon-glyph").textContent = "!";
      button.setAttribute("aria-label", "复制失败");
      button.title = "复制失败";
    }
  });

  function updateProgress() {
    const story = document.querySelector("#story");
    const start = story.offsetTop;
    const distance = Math.max(story.offsetHeight - innerHeight, 1);
    const percent = Math.max(0, Math.min(100, ((scrollY - start) / distance) * 100));
    document.querySelector("#progressBar").style.width = `${percent}%`;
    document.querySelector("#progressText").textContent = `${Math.round(percent)}%`;
  }

  addEventListener("scroll", updateProgress, { passive: true });
  renderFilters();
  renderTimeline();
  restoreEdits();
  setTheme(localStorage.getItem(themeStoreKey) || "dark");
  updateProgress();
})();