'use client'

import Link from 'next/link'
import { usePathname, useRouter } from 'next/navigation'
import { useState } from 'react'
import { cn } from '@/lib/utils'
import { signOut } from '@/lib/auth-actions'
import type { SpaceMember, Space } from '@/lib/types'
import {
  Menu, X, LayoutDashboard, ListChecks, FolderKanban, Settings2,
  MessageSquare, Users, CreditCard, BookUser, Download, LogOut,
} from 'lucide-react'

function NavLink({
  href, label, icon: Icon, badge, active, onClick,
}: {
  href: string
  label: string
  icon: React.ElementType
  badge?: number
  active: boolean
  onClick?: () => void
}) {
  return (
    <Link
      href={href}
      onClick={onClick}
      className={cn(
        'flex items-center justify-between mx-2 px-3 py-2 rounded-md text-sm transition-colors',
        active
          ? 'bg-[var(--sidebar-primary)]/15 text-[var(--sidebar-primary)]'
          : 'text-[var(--sidebar-foreground)]/70 hover:bg-[var(--sidebar-accent)] hover:text-[var(--sidebar-foreground)]',
      )}
    >
      <span className="flex items-center gap-2.5">
        <Icon className={cn('w-4 h-4', active ? 'text-[var(--sidebar-primary)]' : 'text-[var(--sidebar-foreground)]/50')} />
        {label}
      </span>
      {badge && badge > 0 ? (
        <span className="text-[10px] bg-red-500 text-white rounded-full w-4 h-4 flex items-center justify-center font-medium">
          {badge}
        </span>
      ) : null}
    </Link>
  )
}

// Bottom nav items for mobile
const MOBILE_NAV = [
  { label: 'Home',     href: '/dashboard', icon: LayoutDashboard },
  { label: 'Tasks',    href: '/tasks',     icon: ListChecks },
  { label: 'Comms',    href: '/comms',     icon: MessageSquare },
  { label: 'Members',  href: '/members',   icon: Users },
  { label: 'More',     href: null,         icon: Menu },
]

interface AppSidebarProps {
  member: SpaceMember & { spaces: Space }
  taskBadge?: number
  commsBadge?: number
  paymentBadge?: number
}

export function AppSidebar({ member, taskBadge = 0, commsBadge = 0, paymentBadge = 0 }: AppSidebarProps) {
  const pathname = usePathname()
  const router = useRouter()
  const space = member.spaces
  const initials = member.display_name.split(' ').map(n => n[0]).join('').toUpperCase().slice(0, 2)
  const isAdmin = member.role === 'admin' || member.role === 'board'
  const [drawerOpen, setDrawerOpen] = useState(false)

  function isActive(href: string) {
    return pathname === href || pathname.startsWith(href + '/')
  }

  async function handleSignOut() {
    await signOut()
  }

  const SidebarContent = ({ onNav }: { onNav?: () => void }) => (
    <>
      {/* Logo */}
      <div className="px-5 py-5 border-b border-[var(--sidebar-border)]">
        <Link href="/dashboard" onClick={onNav} className="flex items-center gap-2.5">
          <div className="w-8 h-8 rounded bg-[var(--sidebar-primary)] flex items-center justify-center">
            <span className="text-white font-mono text-xs font-bold">{'{'}<span>hs</span>{'}'}</span>
          </div>
        </Link>
        <p className="text-[var(--sidebar-foreground)]/60 text-xs mt-1.5 font-mono truncate">{space?.name || 'My Space'}</p>
      </div>

      {/* Nav */}
      <nav className="flex-1 py-4 overflow-y-auto">
        <div className="px-3 mb-1">
          <p className="text-[10px] uppercase tracking-widest text-[var(--sidebar-foreground)]/30 px-2 py-1 font-mono">Workspace</p>
        </div>
        <NavLink href="/dashboard" label="Dashboard"     icon={LayoutDashboard} active={isActive('/dashboard')}               onClick={onNav} />
        <NavLink href="/tasks"     label="Tasks & Chores" icon={ListChecks}       active={isActive('/tasks')}   badge={taskBadge}  onClick={onNav} />
        <NavLink href="/projects"  label="Projects"       icon={FolderKanban}     active={isActive('/projects')}                   onClick={onNav} />
        <NavLink href="/ops"       label="Ops & Facilities" icon={Settings2}     active={isActive('/ops')}                        onClick={onNav} />
        <NavLink href="/comms"     label="Comms"          icon={MessageSquare}    active={isActive('/comms')}   badge={commsBadge} onClick={onNav} />

        <div className="px-3 mt-4 mb-1">
          <p className="text-[10px] uppercase tracking-widest text-[var(--sidebar-foreground)]/30 px-2 py-1 font-mono">People</p>
        </div>
        <NavLink href="/members"  label="Members"  icon={Users}      active={isActive('/members')}                      onClick={onNav} />
        <NavLink href="/payments" label="Payments" icon={CreditCard} active={isActive('/payments')} badge={paymentBadge} onClick={onNav} />
        <NavLink href="/contacts" label="Contacts" icon={BookUser}   active={isActive('/contacts')}                     onClick={onNav} />

        {isAdmin && (
          <>
            <div className="px-3 mt-4 mb-1">
              <p className="text-[10px] uppercase tracking-widest text-[var(--sidebar-foreground)]/30 px-2 py-1 font-mono">Admin</p>
            </div>
            <NavLink href="/import"   label="Import / Sync" icon={Download}  active={isActive('/import')}   onClick={onNav} />
            <NavLink href="/settings" label="Settings"      icon={Settings2} active={isActive('/settings')} onClick={onNav} />
          </>
        )}
      </nav>

      {/* User */}
      <div className="border-t border-[var(--sidebar-border)] p-3">
        <button
          onClick={handleSignOut}
          className="w-full flex items-center gap-3 px-2 py-2 rounded-md hover:bg-[var(--sidebar-accent)] transition-colors group"
        >
          <div className="w-7 h-7 rounded bg-[var(--sidebar-primary)]/80 flex items-center justify-center text-white text-xs font-bold shrink-0">
            {initials}
          </div>
          <div className="flex-1 text-left min-w-0">
            <p className="text-[var(--sidebar-foreground)] text-xs font-medium truncate">{member.display_name}</p>
            <p className="text-[var(--sidebar-foreground)]/40 text-[10px] font-mono">{member.role} · {member.tier}</p>
          </div>
          <LogOut className="w-3.5 h-3.5 text-[var(--sidebar-foreground)]/30" />
        </button>
      </div>
    </>
  )

  return (
    <>
      {/* ── Desktop sidebar ─────────────────────────────────── */}
      <aside className="hidden md:flex w-[230px] shrink-0 bg-[var(--sidebar)] flex-col h-screen sticky top-0 border-r border-[var(--sidebar-border)]">
        <SidebarContent />
      </aside>

      {/* ── Mobile: top bar ──────────────────────────────────── */}
      <div className="md:hidden fixed top-0 left-0 right-0 z-40 bg-[var(--sidebar)] border-b border-[var(--sidebar-border)] flex items-center justify-between px-4 py-3">
        <Link href="/dashboard" className="flex items-center gap-2">
          <div className="w-7 h-7 rounded bg-[var(--sidebar-primary)] flex items-center justify-center">
            <span className="text-white font-mono text-[10px] font-bold">hs</span>
          </div>
          <span className="text-[var(--sidebar-foreground)]/60 text-xs font-mono truncate max-w-[150px]">{space?.name}</span>
        </Link>
        <button
          onClick={() => setDrawerOpen(true)}
          className="text-[var(--sidebar-foreground)]/70 hover:text-[var(--sidebar-foreground)] p-1"
          aria-label="Open menu"
        >
          <Menu className="w-5 h-5" />
        </button>
      </div>

      {/* ── Mobile: full drawer ──────────────────────────────── */}
      {drawerOpen && (
        <div className="md:hidden fixed inset-0 z-50 flex">
          {/* Backdrop */}
          <div className="absolute inset-0 bg-black/50" onClick={() => setDrawerOpen(false)} />
          {/* Drawer */}
          <div className="relative w-[280px] bg-[var(--sidebar)] flex flex-col h-full shadow-xl">
            <div className="flex items-center justify-between px-4 py-3 border-b border-[var(--sidebar-border)]">
              <span className="text-[var(--sidebar-foreground)] text-sm font-mono font-bold">Menu</span>
              <button onClick={() => setDrawerOpen(false)} className="text-[var(--sidebar-foreground)]/50 hover:text-[var(--sidebar-foreground)]">
                <X className="w-5 h-5" />
              </button>
            </div>
            <div className="flex-1 overflow-y-auto">
              <SidebarContent onNav={() => setDrawerOpen(false)} />
            </div>
          </div>
        </div>
      )}
    </>
  )
}