// static/js/06-pages.js
"use strict";
window.Glow = window.Glow || {};
// comments, version history, and share links intentionally disabled in production until backend support complete

Glow.renderPagesEmptyState = message => {
  Glow.els.pagesBox.replaceChildren();
  const state = document.createElement("div");
  state.className = "empty-state";
  const card = document.createElement("div");
  card.className = "empty-card";
  card.textContent = message;
  state.append(card);
  Glow.els.pagesBox.append(state);
};

Glow.pageTypeLabel = type => {
  const labels = {
    project: "project",
    document: "document",
    update: "update",
    resource: "resource"
  };
  return labels[type] || "page";
};

Glow.loadPages = async (pageType = Glow.state.pageTypeFilter) => {
  const team = Glow.state.activeTeam;
  if (!team) {
    Glow.renderPagesEmptyState("select a team to view pages.");
    return;
  }

  Glow.els.pagesBox.setAttribute("aria-busy", "true");
  try {
    const query = pageType ? `?type=${encodeURIComponent(pageType)}` : "";
    const data = await Glow.apiRequest(
      `/api/teams/${encodeURIComponent(team.slug)}/pages${query}`
    );
    if (Glow.state.activeTeam?.slug !== team.slug) return;
    Glow.state.pages = data.pages || [];
    Glow.state.pageTypeFilter = pageType || "";
    Glow.renderPages();
  } catch (error) {
    Glow.renderPagesEmptyState(error.message || "could not load pages.");
    Glow.showToast(error.message || "could not load pages.", "error");
  } finally {
    Glow.els.pagesBox.setAttribute("aria-busy", "false");
  }
};

Glow.renderPages = () => {
  const box = Glow.els.pagesBox;
  const team = Glow.state.activeTeam;
  const pages = Glow.state.pages || [];
  box.replaceChildren();

  const header = document.createElement("div");
  header.className = "pages-header";

  const copy = document.createElement("div");
  const title = document.createElement("h2");
  title.textContent = `${team?.name || "team"} pages`;
  const subtitle = document.createElement("p");
  subtitle.textContent = "shared team knowledge and public resources.";
  copy.append(title, subtitle);
  header.append(copy);

  if (team?.can_manage) {
    const create = document.createElement("button");
    create.className = "button";
    create.type = "button";
    create.textContent = "new page";
    create.addEventListener("click", Glow.createPage);
    header.append(create);
  }

  box.append(header);

  const filters = document.createElement("div");
  filters.className = "page-filters compact";
  const filterOptions = [
    ["", "all"],
    ["project", "projects"],
    ["document", "documents"],
    ["update", "updates"],
    ["resource", "resources"]
  ];

  for (const [value, label] of filterOptions) {
    const button = document.createElement("button");
    button.className = "page-filter";
    button.type = "button";
    button.textContent = label;
    button.classList.toggle("active", Glow.state.pageTypeFilter === value);
    button.addEventListener("click", () => Glow.loadPages(value));
    filters.append(button);
  }

  box.append(filters);

  if (!pages.length) {
    const empty = document.createElement("div");
    empty.className = "empty-state page-empty-state";
    const card = document.createElement("div");
    card.className = "empty-card";
    card.textContent = "no pages match this filter.";
    empty.append(card);
    box.append(empty);
    return;
  }

  const list = document.createElement("div");
  list.className = "pages-list";

  for (const page of pages) {
    list.append(Glow.buildPageCard(page));
  }

  box.append(list);
};

Glow.buildPageCard = page => {
  const article = document.createElement("article");
  article.className = "page-card compact";
  article.tabIndex = 0;

  const meta = document.createElement("div");
  meta.className = "page-card-meta";

  const type = document.createElement("span");
  type.className = "page-badge type";
  type.textContent = Glow.pageTypeLabel(page.page_type);

  const visibility = document.createElement("span");
  visibility.className = `page-badge visibility ${page.visibility}`;
  visibility.textContent = page.visibility;

  meta.append(type, visibility);

  const title = document.createElement("h3");
  title.textContent = page.title;

  const footer = document.createElement("div");
  footer.className = "page-card-footer";

  const context = document.createElement("span");
  context.textContent = page.channel_name
    ? `#${page.channel_name}`
    : "team page";

  const updated = document.createElement("time");
  updated.dateTime = page.updated_at;
  updated.title = new Date(page.updated_at).toLocaleString();
  updated.textContent = `updated ${Glow.relativeTime(page.updated_at)}`;

  footer.append(context, updated);

  const open = () => Glow.openPage(page.slug);
  article.addEventListener("click", open);
  article.addEventListener("keydown", event => {
    if (event.key === "Enter" || event.key === " ") {
      event.preventDefault();
      open();
    }
  });

  article.append(meta, title, footer);
  return article;
};

Glow.openPages = async () => {
  Glow.state.activeDm = null;
  Glow.state.activeView = "pages";
  Glow.state.activePage = null;
  Glow.updateViewUI();
  await Glow.loadPages();
};

Glow.openPage = async pageSlug => {
  const team = Glow.state.activeTeam;
  if (!team) return;

  Glow.state.activeView = "page";
  Glow.state.activePage = null;
  Glow.updateViewUI();
  Glow.els.pageDetailBox.setAttribute("aria-busy", "true");

  try {
    const data = await Glow.apiRequest(
      `/api/teams/${encodeURIComponent(team.slug)}/pages/${encodeURIComponent(pageSlug)}`
    );
    Glow.state.activePage = data.page;
    Glow.renderPageDetail();
  } catch (error) {
    Glow.showToast(error.message || "could not load page.", "error");
    Glow.openPages();
  } finally {
    Glow.els.pageDetailBox.setAttribute("aria-busy", "false");
  }
};

Glow.renderPageDetail = () => {
  const box = Glow.els.pageDetailBox;
  const page = Glow.state.activePage;
  box.replaceChildren();

  if (!page) {
    const state = document.createElement("div");
    state.className = "empty-state";
    const card = document.createElement("div");
    card.className = "empty-card";
    card.textContent = "page not found.";
    state.append(card);
    box.append(state);
    return;
  }

  const header = document.createElement("div");
  header.className = "page-detail-header";

  const meta = document.createElement("div");
  meta.className = "page-detail-meta";

  const type = document.createElement("span");
  type.className = "page-badge type";
  type.textContent = Glow.pageTypeLabel(page.page_type);

  const visibility = document.createElement("span");
  visibility.className = `page-badge visibility ${page.visibility}`;
  visibility.textContent = page.visibility;

  const updated = document.createElement("time");
  updated.className = "page-updated";
  updated.dateTime = page.updated_at;
  updated.title = new Date(page.updated_at).toLocaleString();
  updated.textContent = `updated ${Glow.relativeTime(page.updated_at)}`;

  meta.append(type, visibility, updated);

  const title = document.createElement("h1");
  title.textContent = page.title;

  const context = document.createElement("p");
  context.className = "page-detail-context";
  context.textContent = page.channel_name
    ? `${page.team_name} · #${page.channel_name}`
    : page.team_name;

  header.append(meta, title, context);
  box.append(header);

  const body = document.createElement("article");
  body.className = "page-body markdown-body";
  body.innerHTML = page.body_html || "<p>no content yet.</p>";
  box.append(body);

  const actions = document.createElement("div");
  actions.className = "page-detail-actions";

  if (page.can_edit) {
    const edit = document.createElement("button");
    edit.className = "button";
    edit.type = "button";
    edit.textContent = "edit";
    edit.addEventListener("click", () => Glow.editPage(page));

    const remove = document.createElement("button");
    remove.className = "danger-button";
    remove.type = "button";
    remove.textContent = "delete";
    remove.addEventListener("click", () => Glow.deletePage(page));

    actions.append(edit, remove);
  }

  box.append(actions);
};

Glow.pageDialogFields = (page = null) => [
  {
    name: "title",
    label: "title",
    value: page?.title || "",
    placeholder: "page title",
    maxLength: 160
  },
  {
    name: "page_type",
    label: "type: project, document, update, or resource",
    value: page?.page_type || "document",
    maxLength: 12
  },
  {
    name: "visibility",
    label: "visibility: team or public",
    value: page?.visibility || "team",
    maxLength: 6
  },
  {
    name: "channel_slug",
    label: "channel slug (optional)",
    value: page?.channel_slug || "",
    placeholder: "general",
    maxLength: 48
  },
  {
    name: "body",
    label: "markdown content",
    value: page?.body || "",
    multiline: true,
    rows: 14,
    maxLength: 100000
  }
];

Glow.validatePageValues = values => {
  if (!values.title) {
    Glow.showToast("page title is required.", "error");
    return null;
  }

  const pageType = values.page_type.toLowerCase();
  if (!["project", "document", "update", "resource"].includes(pageType)) {
    Glow.showToast("choose a valid page type.", "error");
    return null;
  }

  const visibility = values.visibility.toLowerCase();
  if (!["team", "public"].includes(visibility)) {
    Glow.showToast("visibility must be team or public.", "error");
    return null;
  }

  return {
    title: values.title,
    body: values.body,
    page_type: pageType,
    visibility,
    channel_slug: values.channel_slug.toLowerCase()
  };
};

Glow.createPage = async () => {
  const team = Glow.state.activeTeam;
  if (!team?.can_manage) return;

  const values = await Glow.openDialog({
    title: "create page",
    body: "create a shared team page or a public resource. markdown is supported.",
    confirmText: "create page",
    fields: Glow.pageDialogFields()
  });
  if (!values) return;

  const payload = Glow.validatePageValues(values);
  if (!payload) return;

  try {
    const data = await Glow.apiRequest(
      `/api/teams/${encodeURIComponent(team.slug)}/pages`,
      {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload)
      }
    );
    Glow.showToast("page created.");
    await Glow.openPage(data.page.slug);
  } catch (error) {
    Glow.showToast(error.message || "could not create page.", "error");
  }
};

Glow.editPage = async page => {
  if (!page.can_edit) return;

  const values = await Glow.openDialog({
    title: `edit ${page.title}`,
    confirmText: "save",
    fields: Glow.pageDialogFields(page)
  });
  if (!values) return;

  const payload = Glow.validatePageValues(values);
  if (!payload) return;

  try {
    const data = await Glow.apiRequest(
      `/api/teams/${encodeURIComponent(page.team_slug)}/pages/${encodeURIComponent(page.slug)}`,
      {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(payload)
      }
    );
    Glow.state.activePage = data.page;
    Glow.renderPageDetail();
    Glow.showToast("page updated.");
  } catch (error) {
    Glow.showToast(error.message || "could not update page.", "error");
  }
};

Glow.deletePage = async page => {
  if (!page.can_edit) return;

  const result = await Glow.openDialog({
    title: `delete ${page.title}?`,
    body: "this page will no longer be available.",
    confirmText: "delete page",
    danger: true
  });
  if (!result) return;

  try {
    await Glow.apiRequest(
      `/api/teams/${encodeURIComponent(page.team_slug)}/pages/${encodeURIComponent(page.slug)}`,
      { method: "DELETE" }
    );
    Glow.showToast("page deleted.");
    await Glow.openPages();
  } catch (error) {
    Glow.showToast(error.message || "could not delete page.", "error");
  }
};