@if (loading) {
  <main class="loading-shell">载入中</main>
} @else if (!user) {
  <main class="login-view">
    <form class="login-panel" (ngSubmit)="login()">
      <div>
        <p class="eyebrow">Osaet Admin</p>
        <h1>登录后台</h1>
      </div>

      <label>
        用户名
        <input name="username" autocomplete="username" [(ngModel)]="loginUsername" />
      </label>

      <label>
        密码
        <input
          name="password"
          type="password"
          autocomplete="current-password"
          [(ngModel)]="loginPassword"
        />
      </label>

      <button type="submit">登录</button>
      <p class="message">{{ loginMessage }}</p>
    </form>
  </main>
} @else {
  <main class="shell">
    <header class="topbar">
      <nav class="breadcrumb" aria-label="面包屑">
        <a href="/">首页</a>
        <span>/</span>
        @if (view === 'list') {
          <span>文章</span>
        } @else if (view === 'logs') {
          <button type="button" (click)="backToList()">文章</button>
          <span>/</span>
          <span>日志</span>
        } @else {
          <button type="button" (click)="backToList()">文章</button>
          <span>/</span>
          <span>{{ draft.title || '新文章' }}</span>
        }
      </nav>

      <details class="user-menu">
        <summary>{{ user.username }}</summary>
        <div class="user-menu-panel">
          <button type="button" (click)="showLogs()">日志</button>
          <button type="button" (click)="logout()">退出</button>
        </div>
      </details>
    </header>

    @if (feedback) {
      <aside
        class="feedback-toast"
        [class.info]="feedback.tone === 'info'"
        [class.error]="feedback.tone === 'error'"
        aria-live="polite"
      >
        <div>
          <strong>{{ feedback.title }}</strong>
          <span>{{ feedback.message }}</span>
        </div>
        <button type="button" aria-label="关闭提示" (click)="closeFeedback()">x</button>
      </aside>
    }

    @if (view === 'list') {
      <section class="list-view">
        <div class="page-heading">
          <div>
            <p class="eyebrow">Posts</p>
            <h1>文章管理</h1>
          </div>
          <div class="page-actions">
            <select aria-label="文章状态" [(ngModel)]="statusFilter" (change)="changeStatusFilter()">
              <option value="">全部</option>
              <option value="draft">草稿</option>
              <option value="published">已发布</option>
              <option value="archived">归档</option>
            </select>
            <button type="button" (click)="newPost()">新文章</button>
          </div>
        </div>

        <div class="post-table">
          @if (posts.length === 0) {
            <p class="empty-message">暂无文章</p>
          } @else {
            <div class="post-table-head">
              <span>标题</span>
              <span>标签</span>
              <span>状态</span>
              <span>更新时间</span>
              <span>操作</span>
            </div>
            @for (post of posts; track post.id) {
              <div
                class="post-table-row"
                role="button"
                tabindex="0"
                (click)="selectPost(post.id)"
              >
                <span class="post-row-title">{{ post.title || '未命名' }}</span>
                <span class="post-row-tags">{{ tagText(post) }}</span>
                <span>{{ statusText(post.status) }}</span>
                <span>{{ formatDate(post.updatedAt) }}</span>
                <span class="row-actions">
                  <span class="table-action" role="button" tabindex="0" (click)="editPost(post.id, $event)">
                    编辑
                  </span>
                  <span class="table-action danger" role="button" tabindex="0" (click)="deletePost(post, $event)">
                    删除
                  </span>
                </span>
              </div>
            }
          }
        </div>

        <nav class="pagination" aria-label="文章分页">
          <button type="button" class="link-button" [disabled]="page <= 1" (click)="previousPage()">
            ← 上一页
          </button>
          <span class="page-numbers">
            <button
              type="button"
              class="page-number"
              *ngFor="let pageNumber of pageNumbers"
              [class.active]="pageNumber === page"
              (click)="goToPage(pageNumber)"
            >
              {{ pageNumber }}
            </button>
          </span>
          <button type="button" class="link-button" [disabled]="page >= totalPages" (click)="nextPage()">
            下一页 →
            </button>
        </nav>
      </section>
    } @else if (view === 'logs') {
      <section class="list-view">
        <div class="page-heading">
          <div>
            <p class="eyebrow">Audit</p>
            <h1>操作日志</h1>
          </div>
          <div class="page-actions log-actions">
            <input
              name="auditQuery"
              placeholder="搜索用户、动作、资源、详情"
              [(ngModel)]="auditQuery"
              (keyup.enter)="changeAuditFilter()"
            />
            <select aria-label="日志动作" [(ngModel)]="auditActionFilter" (change)="changeAuditFilter()">
              <option value="">全部动作</option>
              <option value="login">登录</option>
              <option value="login_failed">登录失败</option>
              <option value="logout">退出</option>
              <option value="post_create">新建文章</option>
              <option value="post_update">修改文章</option>
              <option value="post_delete">删除文章</option>
              <option value="post_publish">发布文章</option>
              <option value="build_create">提交构建</option>
              <option value="slug_generate">生成 Slug</option>
            </select>
            <select aria-label="资源类型" [(ngModel)]="auditResourceFilter" (change)="changeAuditFilter()">
              <option value="">全部资源</option>
              <option value="user">用户</option>
              <option value="post">文章</option>
              <option value="build_job">构建</option>
            </select>
            <button type="button" (click)="changeAuditFilter()">查询</button>
          </div>
        </div>

        <div class="post-table log-table">
          @if (auditLogs.length === 0) {
            <p class="empty-message">暂无日志</p>
          } @else {
            <div class="log-table-head">
              <span>时间</span>
              <span>用户</span>
              <span>动作</span>
              <span>资源</span>
              <span>详情</span>
              <span>IP</span>
            </div>
            @for (log of auditLogs; track log.id) {
              <div class="log-table-row">
                <span>{{ formatDate(log.createdAt) }}</span>
                <span>{{ log.actorUsername || '匿名' }}</span>
                <span>{{ actionText(log.action) }}</span>
                <span>{{ log.resourceType || '-' }} {{ log.resourceId || '' }}</span>
                <span class="log-details">{{ detailsText(log) }}</span>
                <span>{{ log.ipAddress || '-' }}</span>
              </div>
            }
          }
        </div>

        <nav class="pagination" aria-label="日志分页">
          <button type="button" class="link-button" [disabled]="auditPage <= 1" (click)="previousAuditPage()">
            ← 上一页
          </button>
          <span>第 {{ auditPage }} / {{ totalAuditPages }} 页，共 {{ totalAuditLogs }} 条</span>
          <button
            type="button"
            class="link-button"
            [disabled]="auditPage >= totalAuditPages"
            (click)="nextAuditPage()"
          >
            下一页 →
          </button>
        </nav>
      </section>
    } @else {
      <section class="editor-view">
        <form class="editor-form" (ngSubmit)="savePost()">
          <div class="editor-head">
            <div>
              <p class="eyebrow">{{ currentPost ? '版本 ' + currentPost.version : '新文章' }}</p>
              <h1>
                {{ draft.title || '开始写作' }}
                @if (hasUnsavedChanges()) {
                  <span class="dirty-dot" title="未保存"></span>
                }
              </h1>
            </div>
            <div class="editor-actions">
              <button type="submit" class="save-button" [disabled]="saving">{{ saving ? '保存中' : '保存' }}</button>
              <button type="button" class="build-button" (click)="buildPost()">构建</button>
            </div>
          </div>

          <div class="fields-grid">
            <label>
              标题
              <input name="title" required [(ngModel)]="draft.title" (input)="onTitleInput()" />
            </label>

            <label>
              Slug
              <span class="slug-control">
                <input name="slug" required [(ngModel)]="draft.slug" (input)="onSlugInput()" />
                <button
                  type="button"
                  class="slug-ai-button"
                  [disabled]="generatingSlug"
                  [attr.aria-label]="generatingSlug ? '正在生成 Slug' : 'AI 生成 Slug'"
                  [title]="generatingSlug ? '正在生成 Slug' : 'AI 生成 Slug'"
                  (click)="generateSlug()"
                >
                  <span aria-hidden="true">✦</span>
                </button>
              </span>
            </label>

            <label>
              状态
              <select name="status" [(ngModel)]="draft.status" (change)="onDraftInput()">
                <option value="draft">草稿</option>
                <option value="published">已发布</option>
                <option value="archived">归档</option>
              </select>
            </label>

            <label>
              创建时间
              <input
                name="createdAt"
                type="datetime-local"
                [(ngModel)]="draft.createdAt"
                (input)="onDraftInput()"
              />
            </label>

            <label>
              封面
              <input name="cover" [(ngModel)]="draft.cover" (input)="onDraftInput()" />
            </label>

            <label class="wide-field">
              标签
              <input
                name="tags"
                placeholder="用逗号分隔，例如：生活, 技术"
                [(ngModel)]="tagsText"
                (input)="onDraftInput()"
              />
            </label>
          </div>

          <label>
            摘要
            <textarea
              name="summary"
              rows="3"
              [(ngModel)]="draft.summary"
              (input)="onDraftInput()"
            ></textarea>
          </label>

          <label class="body-field">
            <span class="body-label-row">
              正文 Markdown
              <span class="mode-switch" role="group" aria-label="编辑模式">
                <button type="button" [class.active]="editorMode === 'edit'" (click)="setEditorMode('edit')">
                  编辑
                </button>
                <button type="button" [class.active]="editorMode === 'preview'" (click)="setEditorMode('preview')">
                  预览
                </button>
                <button type="button" [class.active]="editorMode === 'split'" (click)="setEditorMode('split')">
                  分栏
                </button>
              </span>
            </span>

            <div class="markdown-workspace" [class.split]="editorMode === 'split'">
              @if (editorMode !== 'preview') {
                <textarea
                  name="bodyMarkdown"
                  spellcheck="false"
                  [(ngModel)]="draft.bodyMarkdown"
                  (input)="onDraftInput()"
                ></textarea>
              }

              @if (editorMode !== 'edit') {
                <article class="markdown-preview" [innerHTML]="previewHtml"></article>
              }
            </div>
          </label>

          <div class="editor-status-row">
            <p class="message">{{ editorMessage }}</p>
            <span class="autosave-status">{{ autosaveStatus }}</span>
          </div>

          @if (currentBuildJob) {
            <section class="build-panel">
              <div class="build-panel-head">
                <div>
                  <p class="eyebrow">Build Job</p>
                  <h3>{{ buildStatusText(currentBuildJob.status) }}</h3>
                </div>
                <button type="button" class="link-button" (click)="toggleBuildLog()">
                  {{ showBuildLog ? '收起日志' : '查看日志' }}
                </button>
              </div>

              <dl class="build-meta">
                <div>
                  <dt>ID</dt>
                  <dd>{{ currentBuildJob.id }}</dd>
                </div>
                <div>
                  <dt>开始</dt>
                  <dd>{{ formatDate(currentBuildJob.startedAt) }}</dd>
                </div>
                <div>
                  <dt>结束</dt>
                  <dd>{{ formatDate(currentBuildJob.finishedAt) }}</dd>
                </div>
              </dl>

              @if (currentBuildJob.error) {
                <p class="build-error">{{ currentBuildJob.error }}</p>
              }

              @if (showBuildLog) {
                <pre class="build-log">{{ currentBuildJob.log || '暂无日志' }}</pre>
              }
            </section>
          }
        </form>
      </section>
    }
  </main>
}