import { Loader2 } from "lucide-react";
import type { ReactNode } from "react";

/** 站点设置工作区：限宽、主内容区内左对齐，不写入后台公共主容器 */
export function AdminSettingsPage({
  children,
  className,
}: {
  children: ReactNode;
  className?: string;
}) {
  return <div className={`admin-settings-page${className ? ` ${className}` : ""}`}>{children}</div>;
}

/** 分类导航 + 主表单列 */
export function AdminSettingsWork({
  nav,
  children,
}: {
  nav: ReactNode;
  children: ReactNode;
}) {
  return (
    <div className="admin-settings-work">
      <div className="admin-settings-nav-col">{nav}</div>
      <div className="admin-settings-main">{children}</div>
    </div>
  );
}

/** 一组相关设置：标题、说明、字段、底部操作，减少逐项套卡片 */
export function AdminSettingsGroup({
  title,
  description,
  children,
  footer,
  id,
  className,
}: {
  title: string;
  description?: ReactNode;
  children: ReactNode;
  footer?: ReactNode;
  id?: string;
  className?: string;
}) {
  return (
    <section className={`admin-settings-group${className ? ` ${className}` : ""}`} id={id}>
      <header className="admin-settings-group-head">
        <h2 className="admin-settings-group-title">{title}</h2>
        {description != null && description !== "" ? (
          <p className="admin-settings-group-desc">{description}</p>
        ) : null}
      </header>
      <div className="admin-settings-group-body">{children}</div>
      {footer != null ? <div className="admin-settings-group-footer">{footer}</div> : null}
    </section>
  );
}

/** 标签列 + 控件列；窄表单自动改为上下堆叠 */
export function AdminSettingsRow({
  label,
  htmlFor,
  hint,
  hintBelow,
  error,
  errorId,
  children,
  wide,
  className,
}: {
  label: ReactNode;
  htmlFor?: string;
  /** 短说明，紧邻标签 */
  hint?: ReactNode;
  /** 长说明，放在控件下方 */
  hintBelow?: ReactNode;
  error?: ReactNode;
  errorId?: string;
  children: ReactNode;
  /** 简介等较长控件 */
  wide?: boolean;
  className?: string;
}) {
  const Tag = htmlFor ? "label" : "div";
  return (
    <div className={`admin-settings-row${wide ? " is-wide" : ""}${className ? ` ${className}` : ""}`}>
      <div className="admin-settings-row-label">
        <Tag className="admin-settings-row-name" {...(htmlFor ? { htmlFor } : {})}>
          {label}
        </Tag>
        {hint != null && hint !== "" ? <p className="admin-settings-row-hint">{hint}</p> : null}
      </div>
      <div className="admin-settings-row-control">
        {children}
        {hintBelow != null && hintBelow !== "" ? (
          <div className="admin-settings-row-hint is-below">{hintBelow}</div>
        ) : null}
        {error != null && error !== "" ? (
          <p className="admin-settings-row-error" id={errorId} role="alert">
            {error}
          </p>
        ) : null}
      </div>
    </div>
  );
}

/** 保存单元底部操作：按钮与状态贴齐控件列左边缘 */
export function AdminSettingsActions({
  dirty,
  saving,
  saveLabel,
  onSave,
  onDiscard,
  saveDisabled,
  error,
  children,
}: {
  dirty: boolean;
  saving?: boolean;
  saveLabel: string;
  onSave: () => void;
  onDiscard?: () => void;
  saveDisabled?: boolean;
  error?: string;
  children?: ReactNode;
}) {
  const status = saving ? "正在保存…" : error ? error : dirty ? "有未保存的修改" : "已保存";
  return (
    <div className="admin-settings-actions" aria-busy={saving || undefined}>
      <div className="admin-settings-actions-inner">
        <div className="admin-settings-actions-btns">
          {children}
          {onDiscard ? (
            <button type="button" className="btn btn-line btn-sm" disabled={!dirty || saving} onClick={onDiscard}>
              撤销修改
            </button>
          ) : null}
          <button
            type="button"
            className="btn btn-primary btn-sm"
            disabled={saveDisabled ?? (!dirty || saving)}
            onClick={onSave}
          >
            {saving ? <Loader2 size={14} className="animate-spin" aria-hidden /> : null}
            {saving ? "保存中…" : saveLabel}
          </button>
        </div>
        <p
          className={`admin-settings-actions-status${error ? " is-error" : ""}`}
          aria-live="polite"
        >
          {status}
        </p>
      </div>
    </div>
  );
}