// 技能 modal:两栏 master-detail。左栏「平台 skill / 我的 skill」两组列表,
// 右栏展示选中 skill 的完整 SKILL.md;删除按钮在右栏正文头部(只对「我的」)。
// 左侧 rail 底部「技能」按钮触发。
// 后端:GET /v1/skills(列表)、GET /v1/skills/{name}(正文)、DELETE /v1/skills/{name}(只删 user 源)。
// 创建 / 改 / fork 仍走对话(save_skill / fork_skill / skill-creator)。
import { $ } from "./dom.js";
import { state } from "./state.js";
import { api } from "./api.js";
import { escapeHtml } from "./format.js";
import { renderMd, highlightIn } from "./markdown.js";

const PLACEHOLDER = '<div class="sk-empty">← 从左侧选一个 skill 查看完整说明</div>';

function openSkillsModal() {
  $("skills-modal").classList.add("show");
  $("sk-detail").innerHTML = PLACEHOLDER;
  renderList();
}
export function closeSkillsModal() {
  $("skills-modal").classList.remove("show");
}

function itemHtml(s) {
  const badge = s.overrides_builtin
    ? ' <span class="sk-badge">已覆盖平台同名</span>'
    : "";
  return `<div class="sk-item" data-name="${escapeHtml(s.name)}">
    <div class="sk-name">${escapeHtml(s.name)}${badge}</div>
    <div class="sk-desc">${escapeHtml(s.description || "")}</div>
  </div>`;
}

async function renderList() {
  const list = $("sk-list");
  list.innerHTML = '<div class="muted" style="padding:8px;">加载中…</div>';
  let data;
  try {
    data = await api("GET", "/v1/skills");
  } catch (e) {
    list.innerHTML = `<div class="err" style="padding:8px;">加载失败: ${escapeHtml(e.message)}</div>`;
    return;
  }
  state.skills = data.skills || []; // 顺手刷新新建任务下拉的缓存
  const platform = state.skills.filter((s) => s.source === "builtin");
  const mine = state.skills.filter((s) => s.source === "user");

  let html = "";
  html += `<div class="sk-group-title">平台 skill (${platform.length})</div>`;
  html +=
    platform.map(itemHtml).join("") ||
    '<div class="muted" style="padding:4px 8px;">(无)</div>';
  html += `<div class="sk-group-title mt">我的 skill (${mine.length})</div>`;
  html += mine.length
    ? mine.map(itemHtml).join("")
    : '<div class="muted" style="padding:4px 8px;font-size:12px;">还没有。让助手「帮我做个 skill」或「把某个平台 skill fork 成我的」即可创建。</div>';

  if (data.load_errors && data.load_errors.length) {
    const errs = data.load_errors
      .map((e) => `${escapeHtml(e.name)}(${escapeHtml(e.reason)})`)
      .join("；");
    html += `<div class="sk-loaderr">⚠ ${data.load_errors.length} 个 skill 因格式问题未加载:${errs}</div>`;
  }
  list.innerHTML = html;
}

async function selectSkill(name, itemEl) {
  // 左栏高亮
  $("sk-list").querySelectorAll(".sk-item.active").forEach((el) => el.classList.remove("active"));
  if (itemEl) itemEl.classList.add("active");

  const detail = $("sk-detail");
  detail.innerHTML = '<div class="muted" style="padding:8px;">加载中…</div>';
  let data;
  try {
    data = await api("GET", "/v1/skills/" + encodeURIComponent(name));
  } catch (e) {
    detail.innerHTML = `<div class="err" style="padding:8px;">加载失败: ${escapeHtml(e.message)}</div>`;
    return;
  }
  const isUser = data.source === "user";
  const srcBadge = isUser
    ? `<span class="sk-badge">${data.overrides_builtin ? "我的 · 已覆盖平台" : "我的"}</span>`
    : `<span class="sk-badge">平台</span>`;
  const delBtn = isUser
    ? `<button class="sk-del small danger" data-del="${escapeHtml(data.name)}" title="删除我的这个 skill">删除</button>`
    : "";
  detail.innerHTML =
    `<div class="sk-d-head"><span class="sk-d-name">${escapeHtml(data.name)}</span>${srcBadge}<span class="spacer"></span>${delBtn}</div>` +
    `<div class="sk-detail-md">${renderMd(data.content)}</div>`;
  highlightIn(detail);
}

// ───── 顶层绑定 ─────
$("hd-skills").onclick = openSkillsModal;
$("sk-close").onclick = closeSkillsModal;
$("skills-modal").addEventListener("click", (e) => {
  if (e.target.id === "skills-modal") closeSkillsModal(); // 点遮罩关闭
});

// 左栏:点 item 选中 → 右栏载正文
$("sk-list").addEventListener("click", (e) => {
  const item = e.target.closest(".sk-item");
  if (item) selectSkill(item.getAttribute("data-name"), item);
});

// 右栏:删除(冒泡到 [data-del])
$("sk-detail").addEventListener("click", async (e) => {
  const del = e.target.closest("[data-del]");
  if (!del) return;
  const name = del.getAttribute("data-del");
  if (!confirm(`删除你的 skill「${name}」?不可撤销(平台同名 skill 不受影响)。`)) return;
  del.disabled = true;
  try {
    await api("DELETE", "/v1/skills/" + encodeURIComponent(name));
    state.skills = null; // 失效缓存,新建任务下拉下次重拉
    $("sk-detail").innerHTML = PLACEHOLDER;
    renderList();
  } catch (err) {
    alert("删除失败: " + err.message);
    del.disabled = false;
  }
});