/**
 * DashboardShell — real sidebar + header layout wrapper.
 * Used for pages that need actual backend connectivity
 * (My Profile, My Portfolio, Verification) instead of the preview mock.
 */
import { For, JSX, Show, createMemo, createSignal, onMount } from 'solid-js';
import {
  User, Briefcase, LayoutDashboard, FolderOpen, MapPin, Star,
  CreditCard, Globe, ShieldCheck, HelpCircle, Settings,
  RefreshCw, LogOut, Bell, ChevronRight,
} from 'lucide-solid';

// ── Icon map (matches DashboardDesignPreview sidebar keys) ────────────────────

const ICON_MAP: Record<string, any> = {
  'my dashboard':          LayoutDashboard,
  'my profile':            User,
  'my portfolio':          FolderOpen,
  'leads':                 MapPin,
  'my responses':          Star,
  'credits':               CreditCard,
  'explore nxtgauge':      Globe,
  'verification':          ShieldCheck,
  'help center':           HelpCircle,
  'settings':              Settings,
  'switch services':       RefreshCw,
  'jobs':                  Briefcase,
  'applications':          Briefcase,
  'shortlisted candidates': User,
  'my applications':       FolderOpen,
  'saved jobs':            Star,
  'my requirements':       FolderOpen,
  'received responses':    Bell,
  'shortlisted responses': Star,
  'logout':                LogOut,
};

function SidebarIcon(props: { label: string }) {
  const key = props.label.toLowerCase();
  const Icon = ICON_MAP[key] || ChevronRight;
  return <Icon size={16} />;
}

function titleCase(value: string) {
  return String(value || '')
    .toLowerCase()
    .replace(/_/g, ' ')
    .replace(/\b\w/g, (c) => c.toUpperCase());
}

// ── Types ─────────────────────────────────────────────────────────────────────

interface Props {
  sidebarItems: string[];
  activeSidebar: string;
  onSidebarSelect: (item: string) => void;
  roleKey: string;
  userName?: string;
  children: JSX.Element;
}

// ── Brand colours ─────────────────────────────────────────────────────────────

const ORANGE = '#FF5E13';
const NAVY   = '#0D0D2A';

// ── Component ─────────────────────────────────────────────────────────────────

export default function DashboardShell(props: Props) {
  const roleLabel = createMemo(() => {
    const k = String(props.roleKey || '').replace(/_/g, ' ');
    return k.charAt(0).toUpperCase() + k.slice(1).toLowerCase();
  });

  const [unreadCount, setUnreadCount] = createSignal(0);

  // Fetch unread notification count
  const fetchUnreadCount = async () => {
    try {
      const token = typeof window !== 'undefined' ? window.sessionStorage.getItem('nxtgauge_access_token') || '' : '';
      if (!token) return;
      const res = await fetch('/api/me/notifications/unread-count', {
        headers: { Authorization: `Bearer ${token}` },
        credentials: 'include',
      });
      if (res.ok) {
        const data = await res.json();
        setUnreadCount(data.unread_count || 0);
      }
    } catch (e) {
      console.error('Failed to fetch unread count:', e);
    }
  };

  // Start polling on mount
  onMount(() => {
    fetchUnreadCount();
    const interval = setInterval(fetchUnreadCount, 30000);
    return () => clearInterval(interval);
  });

  return (
    <div style={{
      display: 'flex',
      'min-height': '100vh',
      background: '#F8FAFC',
      'font-family': "'Exo 2', sans-serif",
    }}>

      {/* ── Sidebar ──────────────────────────────────────────────────────── */}
      <aside style={{
        width: '220px',
        'flex-shrink': '0',
        background: '#FFFFFF',
        display: 'flex',
        'flex-direction': 'column',
        'padding': '0',
        'min-height': '100vh',
        position: 'sticky',
        top: '0',
        height: '100vh',
        'overflow-y': 'auto',
      }}>
        {/* Logo */}
        <div style={{ padding: '20px 16px 12px', 'border-bottom': '1px solid #E5E7EB' }}>
          <img src="/nxtgauge-logo.png" alt="Nxtgauge" style={{ height: '40px', 'object-fit': 'contain', 'max-width': '170px' }} />
        </div>

        {/* Role badge */}
        <div style={{ padding: '10px 16px', 'border-bottom': '1px solid #E5E7EB' }}>
          <p style={{ margin: '0', 'font-size': '10px', 'letter-spacing': '0.08em', 'text-transform': 'uppercase', color: '#6B7280' }}>Active Role</p>
          <p style={{ margin: '2px 0 0', 'font-size': '12px', 'font-weight': '700', color: '#111827' }}>{roleLabel()}</p>
        </div>

        {/* Nav items */}
        <nav style={{ flex: '1', padding: '8px 8px' }}>
          <For each={props.sidebarItems}>
            {(item) => {
              const isActive = () => item.toLowerCase() === props.activeSidebar.toLowerCase();
              const isLogout = item.toLowerCase() === 'logout';
              return (
                <button
                  type="button"
                  onClick={() => props.onSidebarSelect(item)}
                  style={{
                    display: 'flex',
                    'align-items': 'center',
                    gap: '9px',
                    width: '100%',
                    'text-align': 'left',
                    height: '34px',
                    padding: '0 10px',
                    'border-radius': '8px',
                    border: 'none',
                    cursor: 'pointer',
                    'font-size': '12px',
                    'font-weight': '600',
                    'margin-bottom': '4px',
                    background: isActive() ? '#FFF3EE' : 'transparent',
                    color: isActive() ? ORANGE : isLogout ? '#DC2626' : '#6B7280',
                    transition: 'background 0.15s, color 0.15s',
                  }}
                >
                  <span style={{ 'flex-shrink': '0', color: isActive() ? ORANGE : '#9CA3AF' }}>
                    <SidebarIcon label={item} />
                  </span>
                  {titleCase(item)}
                </button>
              );
            }}
          </For>
        </nav>

        {/* User footer */}
        <div style={{ padding: '12px 16px', 'border-top': '1px solid #E5E7EB' }}>
          <p style={{ margin: '0', 'font-size': '12px', 'font-weight': '600', color: '#374151', overflow: 'hidden', 'text-overflow': 'ellipsis', 'white-space': 'nowrap' }}>
            {props.userName || 'User'}
          </p>
        </div>
      </aside>

      {/* ── Main content ─────────────────────────────────────────────────── */}
      <div style={{ flex: '1', display: 'flex', 'flex-direction': 'column', 'min-width': '0' }}>
        {/* Top bar */}
        <header style={{
          height: '56px',
          background: '#fff',
          'border-bottom': '1px solid #E5E7EB',
          display: 'flex',
          'align-items': 'center',
          'justify-content': 'space-between',
          padding: '0 24px',
          'flex-shrink': '0',
        }}>
          <p style={{ margin: '0', 'font-size': '15px', 'font-weight': '700', color: NAVY }}>
            {titleCase(props.activeSidebar)}
          </p>
           <div style={{ display: 'flex', 'align-items': 'center', gap: '12px' }}>
             <button type="button" style={{ position: 'relative', border: 'none', background: 'transparent', cursor: 'pointer', display: 'flex', 'align-items': 'center', 'justify-content': 'center', padding: 0 }}>
               <Bell size={18} style={{ color: '#9CA3AF' }} />
               <Show when={unreadCount() > 0}>
                 <span style={{
                   position: 'absolute',
                   top: '-2px',
                   right: '-2px',
                   width: '8px',
                   height: '8px',
                   background: '#FF5E13',
                   'border-radius': '50%',
                   border: '1px solid white'
                 }}></span>
               </Show>
             </button>
             <div style={{
               width: '32px', height: '32px', 'border-radius': '999px',
               background: ORANGE, color: '#fff', display: 'flex',
               'align-items': 'center', 'justify-content': 'center',
               'font-size': '13px', 'font-weight': '700',
             }}>
               {(props.userName || 'U').charAt(0).toUpperCase()}
             </div>
           </div>
        </header>

        {/* Page content */}
        <main style={{ flex: '1', padding: '24px', 'overflow-y': 'auto' }}>
          {props.children}
        </main>
      </div>
    </div>
  );
}

// ── Shared UI primitives ──────────────────────────────────────────────────────

export const CARD = {
  background: '#fff',
  border: '1px solid #E5E7EB',
  'border-radius': '14px',
  padding: '20px',
  'box-shadow': '0 1px 4px rgba(0,0,0,0.06)',
} as const;

export const BTN_PRIMARY = {
  height: '38px',
  'border-radius': '10px',
  border: 'none',
  background: NAVY,
  color: '#fff',
  padding: '0 18px',
  'font-size': '13px',
  'font-weight': '700',
  cursor: 'pointer',
} as const;

export const BTN_ORANGE = {
  height: '38px',
  'border-radius': '10px',
  border: 'none',
  background: ORANGE,
  color: '#fff',
  padding: '0 18px',
  'font-size': '13px',
  'font-weight': '700',
  cursor: 'pointer',
} as const;

export const BTN_GHOST = {
  height: '38px',
  'border-radius': '10px',
  border: '1px solid #E5E7EB',
  background: '#fff',
  color: '#374151',
  padding: '0 18px',
  'font-size': '13px',
  'font-weight': '600',
  cursor: 'pointer',
} as const;

export const INPUT = {
  height: '40px',
  width: '100%',
  'border-radius': '8px',
  border: '1px solid #E5E7EB',
  padding: '0 12px',
  'font-size': '14px',
  color: '#111827',
  background: '#fff',
  'box-sizing': 'border-box',
} as const;

export const LABEL = {
  display: 'block',
  'font-size': '12px',
  'font-weight': '600',
  color: '#374151',
  'margin-bottom': '6px',
} as const;