import { useEffect, useState } from 'react'
import { useLocation, Link } from 'react-router-dom'
import {
  LayoutGrid,
  Server,
  Bookmark,
  Terminal,
  Waypoints,
  Settings,
  ChevronLeft,
  ChevronRight,
} from 'lucide-react'
import { api, type Integration } from '../lib/api'

interface SidebarProps {
  collapsed: boolean
  onToggle: () => void
}

const navItems = [
  { icon: LayoutGrid, label: 'Glance', route: '/' },
  { icon: Server, label: 'Infrastructure', route: '/infrastructure' },
  { icon: Bookmark, label: 'BookNest', route: '/booknest' },
  { icon: Terminal, label: 'Terminal', route: '/terminal' },
  { icon: Waypoints, label: 'Tunnels', route: '/tunnels' },
  { icon: Settings, label: 'Settings', route: '/settings' },
]

export default function Sidebar({ collapsed, onToggle }: SidebarProps) {
  const width = collapsed ? 64 : 200
  const location = useLocation()
  const [integrations, setIntegrations] = useState<Integration[] | null>(null)

  useEffect(() => {
    api.listIntegrations().then(({ integrations }) => setIntegrations(integrations))
  }, [])

  const errored = integrations?.filter((i) => i.status === 'error').length ?? 0
  const statusOk = errored === 0
  const statusColor = statusOk ? '#2ECC71' : '#E74C3C'
  const statusLabel = integrations === null ? 'Checking…' : statusOk ? 'All Systems Operational' : `${errored} Issue${errored > 1 ? 's' : ''} Detected`

  return (
    <aside
      className="fixed left-0 top-0 z-50 h-screen overflow-hidden flex flex-col py-6"
      style={{ width: `${width}px`, backgroundColor: '#0A0B0D' }}
    >
      {/* Collapse Toggle — floating on the sidebar/content edge, vertically centered */}
      <button
        onClick={onToggle}
        className="fixed top-1/2 z-50 flex items-center justify-center rounded-full cursor-pointer transition-colors"
        style={{
          left: `${width - 11}px`,
          transform: 'translateY(-50%)',
          width: '22px',
          height: '22px',
          border: '1px solid rgba(200,164,52,0.25)',
          backgroundColor: '#15161A',
          color: '#7A7D85',
          boxShadow: '0 0 8px rgba(0,0,0,0.4)',
        }}
        onMouseEnter={(e) => { e.currentTarget.style.color = '#C8A434'; e.currentTarget.style.borderColor = 'rgba(200,164,52,0.5)' }}
        onMouseLeave={(e) => { e.currentTarget.style.color = '#7A7D85'; e.currentTarget.style.borderColor = 'rgba(200,164,52,0.25)' }}
      >
        {collapsed ? <ChevronRight size={12} /> : <ChevronLeft size={12} />}
      </button>

      {/* Logo — prominent, centered at top. Blend mode hides the baked-in
          dark background of the source PNG so only the gold arc shows. */}
      <div className="flex flex-col items-center mb-10" style={{ paddingTop: '4px' }}>
        <img
          src="/archnest-logo-clean.png"
          alt="ArchNest"
          style={{
            width: collapsed ? '56px' : '168px',
            height: 'auto',
            filter: 'drop-shadow(0 0 10px rgba(200,164,52,0.3))',
          }}
        />
      </div>

      {/* Nav Items */}
      <nav className="flex-1 flex flex-col gap-2 w-full" style={{ padding: collapsed ? '0 8px' : '0 12px' }}>
        {navItems.map((item) => {
          const Icon = item.icon
          const active = location.pathname === item.route
          return (
            <Link
              key={item.label}
              to={item.route}
              className={`relative flex items-center no-underline transition-all duration-200 ${collapsed ? 'justify-center' : ''}`}
              style={{
                color: active ? '#C8A434' : '#7A7D85',
                gap: collapsed ? '0' : '12px',
                padding: collapsed ? '12px 0' : '12px 14px',
                borderRadius: '10px',
                backgroundColor: active ? 'rgba(200,164,52,0.1)' : 'transparent',
                border: active ? '1px solid rgba(200,164,52,0.18)' : '1px solid transparent',
                boxShadow: active ? '0 0 14px rgba(200,164,52,0.06)' : 'none',
              }}
              title={collapsed ? item.label : undefined}
              onMouseEnter={(e) => { if (!active) { e.currentTarget.style.backgroundColor = 'rgba(200,164,52,0.05)'; e.currentTarget.style.color = '#C8A434' } }}
              onMouseLeave={(e) => { if (!active) { e.currentTarget.style.backgroundColor = 'transparent'; e.currentTarget.style.color = '#7A7D85' } }}
            >
              {active && (
                <div
                  className="absolute left-0 top-1/2 -translate-y-1/2"
                  style={{ width: '3px', height: '22px', backgroundColor: '#C8A434', borderRadius: '0 3px 3px 0', boxShadow: '0 0 6px rgba(200,164,52,0.5)' }}
                />
              )}
              <Icon className="h-5 w-5 shrink-0" strokeWidth={active ? 2 : 1.5} />
              {!collapsed && (
                <span className="truncate leading-tight font-medium" style={{ fontSize: '13px' }}>
                  {item.label}
                </span>
              )}
            </Link>
          )
        })}
      </nav>

      {/* System Status — rounded block, fits inside nav with breathing room */}
      <div style={{ width: '100%', padding: '0 12px 16px 12px' }}>
        <div
          style={{
            border: '1px solid rgba(122, 125, 133, 0.2)',
            borderRadius: '10px',
            padding: '10px 12px',
            backgroundColor: 'rgba(20, 21, 24, 0.5)',
          }}
        >
          <div className="flex items-center gap-2">
            <div style={{ width: '12px', height: '12px', borderRadius: '50%', border: `2px solid ${statusColor}`, flexShrink: 0 }} />
            {!collapsed && (
              <div>
                <span style={{ fontSize: '9px', color: '#E8E6E0', display: 'block', lineHeight: 1.3, fontWeight: 500 }}>System Status</span>
                <span style={{ fontSize: '8px', color: statusColor, display: 'block', lineHeight: 1.3 }}>{statusLabel}</span>
              </div>
            )}
          </div>
        </div>
      </div>
    </aside>
  )
}
