import React from 'react';
import { Search, Settings } from 'lucide-react';
import { Input } from '../ui/input';
import { Button } from '../ui/button';
import { Avatar, AvatarFallback, AvatarImage } from '../ui/avatar';
import { useAuth } from '../auth/AuthProvider';
import { displayNameFromUser, displayRolesFromCodes } from '../../lib/currentUserDisplay';
import { formatRelativeSince } from '../../lib/relativeSince';

interface HeaderProps {
  title: string;
  /** 右上角设置：默认跳转 Support，与侧栏一致 */
  onSettingsClick?: () => void;
  /** 点击右上角姓名/角色区域：进入当前用户编辑（由 Layout/App 处理路由） */
  onProfileClick?: () => void;
}

export function Header({ title, onSettingsClick, onProfileClick }: HeaderProps) {
  const auth = useAuth();
  const displayName = displayNameFromUser(auth.user);
  /** 第一行：姓名；第二行：接口返回的人类可读角色（如 Partner Admin） */
  const primaryName = auth.roleDisplay
    ? (auth.user?.fullName ?? '').trim() ||
      (auth.user?.nick ?? auth.user?.userName ?? '').trim() ||
      displayName
    : displayName;
  const roleLine = auth.roleDisplay ?? displayRolesFromCodes(auth.roleCodes);
  const initials = primaryName
    .split(/\s+/)
    .filter(Boolean)
    .slice(0, 2)
    .map((w) => w[0]?.toUpperCase() ?? '')
    .join('') || 'U';

  const currentDate = new Date().toLocaleDateString('en-US', { 
    year: 'numeric', 
    month: 'long', 
    day: 'numeric' 
  });

  return (
    <header className="bg-white border-b border-gray-200 px-8 flex items-center justify-between shadow-sm sticky top-0 z-10 shrink-0" style={{ height: 90 }}>
      <div>
        <h1 className="text-2xl font-bold" style={{ color: 'rgb(43, 50, 143)' }}>{title} Overview</h1>
        <p className="text-sm text-gray-500 mt-1 flex items-center gap-2">
          {currentDate} | Last updated:{' '}
          {auth.loading && !auth.user?.lastUpdated
            ? '…'
            : formatRelativeSince(auth.user?.lastUpdated ?? null)}
        </p>
      </div>

      <div className="flex items-center gap-4">
        <div className="flex items-center w-64 h-9 rounded-md border border-gray-200 bg-gray-50 focus-within:bg-white focus-within:ring-2 focus-within:ring-ring/50 focus-within:border-ring transition-colors overflow-hidden">
          <Search className="h-4 w-4 text-gray-400 shrink-0 ml-3 pointer-events-none" />
          <Input
            type="search"
            placeholder="Search..."
            className="flex-1 min-w-0 border-0 bg-transparent focus-visible:ring-0 focus-visible:ring-offset-0 py-2 px-2 h-full"
          />
        </div>
        
        <Button
          type="button"
          variant="ghost"
          size="icon"
          className="text-gray-500 hover:text-gray-700"
          aria-label="Open Support"
          onClick={() => onSettingsClick?.()}
        >
          <Settings className="w-5 h-5" />
        </Button>
        
        <div className="h-8 w-px bg-gray-200 mx-2" />
        
        <button
          type="button"
          onClick={() => onProfileClick?.()}
          className="flex items-center gap-3 rounded-lg border border-transparent px-2 py-1.5 text-left transition-colors hover:border-gray-200 hover:bg-gray-50 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-500/40"
          aria-label="Open my profile"
        >
          <div className="text-right hidden md:block min-w-0 max-w-[12rem]">
            <div className="text-sm font-medium text-gray-900 truncate">{primaryName}</div>
            <div className="text-xs text-gray-500 truncate" title={roleLine}>
              {roleLine}
            </div>
          </div>
          <Avatar className="h-10 w-10 shrink-0 border border-gray-200">
            <AvatarImage src="https://github.com/shadcn.png" />
            <AvatarFallback>{initials}</AvatarFallback>
          </Avatar>
        </button>
      </div>
    </header>
  );
}