/**
 * 视图模版工具箱 —— 活动开发者写「呈现」时看到的世界(AM 07)。
 *
 * 模版是**内容不是代码**:这里产出的一律是无脚本、无事件处理器、无外链的静态 HTML;
 * 数据由基座在推送时填(`data-slot` 取值、`data-rows` 逐条展开)。
 * 容器是沙箱 iframe(`sandbox=""`),因此**样式必须自带** —— 页面不继承工作台的 CSS。
 *
 * 六个活动共用这一套外壳:汇报面貌一致,不是每个活动各自发明一套。
 */

export type Tone = 'brand' | 'ok' | 'warn' | 'danger' | 'case' | 'archive';

const ACCENT: Readonly<Record<Tone, string>> = {
  brand: '#3370ff',
  ok: '#0aa294',
  warn: '#ff8800',
  danger: '#e5484d',
  case: '#7f3bf5',
  archive: '#46586a',
};

/** 一套克制的排版;所有尺寸用相对单位,窄栏也不横向溢出 */
const BASE_CSS = (accent: string): string => `
  :root { color-scheme: light; }
  * { box-sizing: border-box; }
  body {
    margin: 0; padding: 18px;
    font: 13px/1.6 -apple-system, "PingFang SC", "Noto Sans SC", "Segoe UI", sans-serif;
    color: #1f2933; background: #f7f8fa;
  }
  .wrap { max-width: 760px; margin: 0 auto; }
  .hd { display: flex; align-items: stretch; gap: 12px; margin-bottom: 14px; }
  .hd .bar { width: 4px; border-radius: 2px; background: ${accent}; flex: none; }
  .hd .kick { font-size: 11px; letter-spacing: .08em; color: #6a7686; }
  .hd h1 { margin: 2px 0 0; font-size: 17px; font-weight: 650; letter-spacing: .01em; }
  .card { background: #fff; border: 1px solid #e6e9ee; border-radius: 10px; padding: 14px 16px; margin-bottom: 12px; }
  .card h2 { margin: 0 0 10px; font-size: 12px; font-weight: 600; color: #6a7686; letter-spacing: .04em; }
  .kv { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px 18px; }
  .kv > div { min-width: 0; }
  .kv em { display: block; font-style: normal; font-size: 11px; color: #8b95a3; margin-bottom: 2px; }
  .kv b { font-size: 14px; font-weight: 600; overflow-wrap: anywhere; }
  .tbl-wrap { overflow-x: auto; }
  table { width: 100%; border-collapse: collapse; font-size: 12px; }
  th { text-align: left; font-weight: 600; color: #6a7686; padding: 6px 8px; border-bottom: 1px solid #e6e9ee; white-space: nowrap; }
  td { padding: 7px 8px; border-bottom: 1px solid #f0f2f5; overflow-wrap: anywhere; }
  tr:last-child td { border-bottom: 0; }
  .mono { font-family: "SF Mono", Menlo, Consolas, monospace; }
  .tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 11px; font-weight: 600;
         background: ${accent}1a; color: ${accent}; }
  .note { font-size: 11px; color: #8b95a3; margin-top: 10px; line-height: 1.75; }
  .steps { list-style: none; margin: 0; padding: 0; }
  .steps li { position: relative; padding: 0 0 12px 20px; border-left: 2px solid #e6e9ee; }
  .steps li:last-child { padding-bottom: 0; border-left-color: transparent; }
  .steps li::before { content: ""; position: absolute; left: -5px; top: 5px; width: 8px; height: 8px;
                      border-radius: 50%; background: ${accent}; }
  .steps .t { font-weight: 600; }
  .steps .d { color: #8b95a3; font-size: 11.5px; }
`;

/** 页头 + 卡片区 —— 每张模版都长这样,只换标题与内容 */
export function viewShell(input: {
  title: string;
  kicker: string;
  tone: Tone;
  body: string;
}): string {
  const accent = ACCENT[input.tone];
  return `<style>${BASE_CSS(accent)}</style>
<div class="wrap">
  <div class="hd"><span class="bar"></span><div><div class="kick">${input.kicker}</div><h1>${input.title}</h1></div></div>
  ${input.body}
</div>`;
}

/** 键值卡:`[标签, 取值路径]`;`mono` 用等宽显示编号类字段 */
export function kvCard(title: string, items: ReadonlyArray<readonly [string, string, ('mono' | 'tag')?]>): string {
  const cells = items
    .map(([label, path, style]) => {
      const cls = style === undefined ? '' : ` class="${style === 'mono' ? 'mono' : 'tag'}"`;
      return `<div><em>${label}</em><b${cls} data-slot="${path}"></b></div>`;
    })
    .join('');
  return `<div class="card"><h2>${title}</h2><div class="kv">${cells}</div></div>`;
}

/** 逐条表:行数不写死,由 `data-rows` 展开 */
export function tableCard(
  title: string,
  rowsPath: string,
  columns: ReadonlyArray<readonly [string, string, ('mono')?]>,
  note?: string,
): string {
  const head = columns.map(([label]) => `<th>${label}</th>`).join('');
  const cells = columns
    .map(([, path, style]) => `<td${style === 'mono' ? ' class="mono"' : ''} data-slot="${path}"></td>`)
    .join('');
  return `<div class="card"><h2>${title}</h2><div class="tbl-wrap"><table>
    <thead><tr>${head}</tr></thead>
    <tbody data-rows="${rowsPath}"><tr>${cells}</tr></tbody>
  </table></div>${note === undefined ? '' : `<p class="note">${note}</p>`}</div>`;
}

/** 说明卡:把「为什么这么做」摆在数据旁边 —— 人要在数据上作判断 */
export function noteCard(title: string, html: string): string {
  return `<div class="card"><h2>${title}</h2><p class="note" style="margin-top:0">${html}</p></div>`;
}

/** 阶段时间线:loop 按案例模型的阶段与里程碑组织汇报(AM 07) */
export function stagesCard(title: string, rowsPath: string, note?: string): string {
  return `<div class="card"><h2>${title}</h2><ul class="steps" data-rows="${rowsPath}">
    <li><span class="t" data-slot="name"></span><span class="d" data-slot="state"></span></li>
  </ul>${note === undefined ? '' : `<p class="note">${note}</p>`}</div>`;
}