"""历史任务页：分页表格展示所有任务，可按文件名搜索、下载完成的字幕。

共享 _shared.py 的 BASE_CSS / SHARED_JS。
页面专属：搜索框（防抖）、分页表格、手动刷新（不自动轮询）。
"""

from __future__ import annotations

from ._shared import render_page

PAGE_SIZE = 50
SEARCH_DEBOUNCE_MS = 350

_PAGE_JS = f"""
const PAGE_SIZE = {PAGE_SIZE};
const SEARCH_DEBOUNCE_MS = {SEARCH_DEBOUNCE_MS};
let currentOffset = 0;
let total = 0;
let searchQuery = "";
let debounceTimer = null;

const tbody = document.getElementById("task-body");
const infoEl = document.getElementById("info");
const emptyEl = document.getElementById("empty");
const paginationEl = document.getElementById("pagination");
const searchInput = document.getElementById("search");

document.getElementById("refresh-btn").addEventListener("click", () => load(currentOffset));

// 搜索：输入防抖，改动后回到第一页
searchInput.addEventListener("input", () => {{
  clearTimeout(debounceTimer);
  debounceTimer = setTimeout(() => {{
    searchQuery = searchInput.value.trim();
    load(0);
  }}, SEARCH_DEBOUNCE_MS);
}});

async function load(offset) {{
  currentOffset = offset;
  try {{
    const params = new URLSearchParams({{
      limit: PAGE_SIZE, offset: offset
    }});
    if (searchQuery) params.set("q", searchQuery);
    const r = await fetch("/api/tasks?" + params.toString());
    if (!r.ok) {{ infoEl.textContent = "HTTP " + r.status; return; }}
    const data = await r.json();
    total = data.total;
    renderTable(data.tasks);
    renderPagination();
    const end = Math.min(offset + data.tasks.length, total);
    const prefix = searchQuery ? `搜索“${{escapeHtml(searchQuery)}}”匹配 ` : "共 ";
    infoEl.textContent = total === 0
      ? (searchQuery ? "无匹配任务" : "暂无任务")
      : `${{prefix}}${{total}} 条，显示 ${{offset + 1}}–${{end}}`;
  }} catch (e) {{
    infoEl.textContent = "加载失败";
  }}
}}

function renderTable(tasks) {{
  tbody.innerHTML = "";
  if (tasks.length === 0) {{ emptyEl.style.display = "block"; return; }}
  emptyEl.style.display = "none";

  for (const task of tasks) {{
    const tr = document.createElement("tr");
    const label = STATUS_LABEL[task.status] || task.status;
    const stateClass = "st-" + (task.status === "done" ? "done" : task.status === "failed" ? "fail" : "running");
    let created;
    try {{ created = fmtDateTime24(new Date(task.created_at + "Z")); }}
    catch (e) {{ created = task.created_at; }}

    let idDisplay = task.is_upload ? "—" : "#" + task.id;

    let action;
    if (task.status === "done") {{
      action = `<a href="/api/tasks/${{task.id}}/subtitle?type=bilingual" class="dl">双语</a>`
        + `<a href="/api/tasks/${{task.id}}/subtitle?type=en" class="dl">英</a>`
        + `<a href="/api/tasks/${{task.id}}/subtitle?type=zh" class="dl">中</a>`;
    }} else if (task.status === "failed") {{
      action = `<span class="err-tip" title="${{escapeHtml(task.error || "")}}">查看错误</span>`;
    }} else {{
      action = `<span class="muted">-</span>`;
    }}
    // done/failed 且非上传中：加删除按钮
    const canDelete = (task.status === "done" || task.status === "failed") && !task.is_upload;
    if (canDelete) {{
      action += ` <button class="btn-sm" onclick="deleteTask(${{task.id}})">删除</button>`;
    }}

    let progress;
    if (task.status === "done") progress = "100%";
    else if (task.status === "failed") progress = "—";
    else {{
      const pct = (task.progress == null) ? 0 : task.progress;
      progress = `<div class="mini-bar"><div class="mini-fill" style="width:${{pct}}%"></div></div>${{pct.toFixed(0)}}%`;
    }}

    tr.innerHTML = `
      <td class="muted">${{idDisplay}}</td>
      <td>${{escapeHtml(task.filename)}}</td>
      <td><span class="status-tag ${{stateClass}}">${{label}}</span></td>
      <td>${{progress}}</td>
      <td class="task-time">${{created}}</td>
      <td>${{action}}</td>`;
    tbody.appendChild(tr);
  }}
}}

function renderPagination() {{
  const pages = Math.ceil(total / PAGE_SIZE);
  const currentPage = Math.floor(currentOffset / PAGE_SIZE) + 1;
  if (pages <= 1) {{ paginationEl.innerHTML = ""; return; }}
  let html = "";
  if (currentPage > 1)
    html += `<button class="page-btn" onclick="load(${{(currentPage - 2) * PAGE_SIZE}})">上一页</button> `;
  html += `<span class="page-info">第 ${{currentPage}} / ${{pages}} 页</span>`;
  if (currentPage < pages)
    html += ` <button class="page-btn" onclick="load(${{currentPage * PAGE_SIZE}})">下一页</button>`;
  paginationEl.innerHTML = html;
}}

async function deleteTask(taskId) {{
  if (!confirm("确认删除任务 #" + taskId + "？字幕和中间文件将被清除。")) return;
  try {{
    const r = await fetch("/api/tasks/" + taskId, {{ method: "DELETE" }});
    if (!r.ok) {{ alert("删除失败：" + await r.text()); return; }}
    load(currentOffset);
  }} catch (e) {{
    alert("删除失败：" + e);
  }}
}}

load(0);
"""

_PAGE_CSS = """
.search-input {
  flex: 1; min-width: 180px; max-width: 360px;
  padding: 0.42em 0.7em; border: 1px solid var(--border); border-radius: 6px;
  background: var(--card-bg); color: var(--fg); font-size: 0.9em;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.search-input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
/* 搜索框主导工具栏，刷新/信息靠右不收缩 */
.toolbar { justify-content: flex-start; }
.toolbar .btn-sm, .toolbar .info { flex-shrink: 0; }
"""

_BODY = """
<h1>历史任务</h1>
<p class="sub">所有转写任务记录。可按文件名搜索，完成任务可下载字幕，进行中显示进度。</p>

<div class="toolbar">
  <input id="search" class="search-input" type="search" placeholder="按文件名搜索…" autocomplete="off">
  <button id="refresh-btn" class="btn-sm">刷新</button>
  <span id="info" class="info"></span>
</div>

<div class="table-wrap">
  <table>
    <thead>
      <tr>
        <th>ID</th>
        <th>文件名</th>
        <th>状态</th>
        <th>进度</th>
        <th>创建时间</th>
        <th>操作</th>
      </tr>
    </thead>
    <tbody id="task-body"></tbody>
  </table>
</div>
<div id="pagination" class="pagination"></div>
<div id="empty" class="empty" style="display:none">暂无任务。</div>
"""


def render() -> str:
    return render_page(
        title="历史任务 — audio2text",
        nav_active="history",
        body=_BODY,
        page_js=_PAGE_JS,
        page_css=_PAGE_CSS,
    )