/* CommandPalette — global ⌘K / Ctrl+K launcher.
 *
 * Three sections:
 *   • Navigation        — every primary route from the top-bar nav,
 *                         plus admin shortcuts.
 *   • Recent activity   — last 5 analyses + last 5 device observations,
 *                         pulled lazily from /api/dashboard/overview.
 *   • Companies         — fuzzy search against /api/companies (kicks in
 *                         once the user types a query).
 *
 * Mounted in the root layout so it's available on every page. */

'use client';

import { useEffect, useState, useCallback } from 'react';
import { useRouter } from 'next/navigation';
import { useSession } from '@/lib/auth-client';
import {
  CommandDialog,
  CommandEmpty,
  CommandGroup,
  CommandInput,
  CommandItem,
  CommandList,
  CommandSeparator,
  CommandShortcut,
} from '@/components/ui/command';
import {
  LayoutDashboard,
  Server,
  Activity,
  HardDrive,
  Sparkles,
  Brain,
  Search,
  AlertTriangle,
  Database,
  GitCompare,
  Plug,
  Power,
  Users,
  Workflow,
  Settings,
  ShieldCheck,
  TrendingUp,
  Building2,
  Clock,
} from 'lucide-react';

// ── Static navigation entries ────────────────────────────────────────

interface CommandRoute {
  href: string;
  label: string;
  hint?: string;
  icon: React.ElementType;
  /** Comma-separated extra keywords to match. */
  keywords?: string;
  superAdminOnly?: boolean;
}

const ROUTES: CommandRoute[] = [
  // Primary
  { href: '/', label: 'Dashboard', icon: LayoutDashboard, keywords: 'home ops operations today kpi' },
  { href: '/status', label: 'System status', icon: Activity, keywords: 'health integrations workers sync uptime' },
  { href: '/configuration-items', label: 'Configuration items', icon: Server, keywords: 'ci devices assets' },
  { href: '/backup-status', label: 'Backup status', icon: HardDrive, keywords: 'veeam rpo' },
  { href: '/veeam-comparison', label: 'RPO comparison', icon: GitCompare, keywords: 'pulse veeam datto rmm' },
  { href: '/veeam-analysis', label: 'Backup ticket analysis', icon: Brain, keywords: 'veeam category resolution' },
  // Engagement (super-admin)
  { href: '/engagement', label: 'Engagement overview', icon: TrendingUp, superAdminOnly: true, keywords: 'hours teams email' },
  { href: '/engagement/profile', label: 'Engagement · employee profile', icon: TrendingUp, superAdminOnly: true, keywords: 'employee resource' },
  // Analyzer
  { href: '/analyzer/tickets', label: 'Analyzer · browse tickets', icon: Search, keywords: 'tickets analyzer browse' },
  { href: '/analyzer/reports', label: 'Analyzer · aggregate reports', icon: Sparkles, keywords: 'aggregate report' },
  { href: '/analyzer/queue', label: 'Analyzer · needs review', icon: Sparkles, keywords: 'human review queue' },
  { href: '/analyzer/itglue/applications', label: 'IT Glue · applications', icon: Database, keywords: 'flexible asset' },
  { href: '/analyzer/itglue/configurations', label: 'IT Glue · configurations', icon: Database, keywords: 'configuration' },
  // Admin (super-admin)
  { href: '/admin', label: 'Admin home', icon: Activity, superAdminOnly: true, keywords: 'admin dashboard' },
  { href: '/admin/integrations', label: 'Admin · integrations', icon: Power, superAdminOnly: true, keywords: 'toggle disable enable s1 sentinelone datto itglue' },
  { href: '/admin/sync', label: 'Admin · sync schedules', icon: Clock, superAdminOnly: true, keywords: 'cron schedules autotask veeam' },
  { href: '/admin/workflow', label: 'Admin · workflow rules', icon: Workflow, superAdminOnly: true, keywords: 'classifier ai prompt' },
  { href: '/admin/rmm-overshell', label: 'Admin · RMM Overshell', icon: Activity, superAdminOnly: true, keywords: 'datto execute script' },
  { href: '/admin/itglue-writes', label: 'Admin · IT Glue write log', icon: Database, superAdminOnly: true, keywords: 'audit revert' },
  { href: '/admin/device-link-conflicts', label: 'Admin · device-link conflicts', icon: AlertTriangle, superAdminOnly: true, keywords: 'mapping conflicts xref' },
  { href: '/admin/users', label: 'Admin · users & roles', icon: Users, superAdminOnly: true, keywords: 'invite role permission' },
  // Account
  { href: '/settings', label: 'Settings', icon: Settings, keywords: 'profile account' },
  { href: '/settings/security', label: 'Security · 2FA & sessions', icon: ShieldCheck, keywords: 'two factor totp logout' },
];

interface OverviewResponse {
  observations: Array<{ id: string; kind: string; hostname: string | null; companyName: string | null }>;
  audits: Array<{ id: string; hostname: string | null; companyName: string | null }>;
}

interface CompanyHit {
  id: number;
  name: string;
}

interface CompaniesApiRow {
  id: number;
  companyName: string;
}

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

export function CommandPalette() {
  const [open, setOpen] = useState(false);
  const [query, setQuery] = useState('');
  const [recents, setRecents] = useState<OverviewResponse | null>(null);
  const [allCompanies, setAllCompanies] = useState<CompanyHit[] | null>(null);
  const [companiesLoading, setCompaniesLoading] = useState(false);
  const router = useRouter();
  const { data: session } = useSession();
  const isSuperAdmin = (session?.user as { role?: string } | undefined)?.role === 'super-admin';

  // Bind ⌘K / Ctrl+K (and / when nothing else is focused).
  useEffect(() => {
    function onKey(e: KeyboardEvent) {
      const isCmdK = (e.key === 'k' || e.key === 'K') && (e.metaKey || e.ctrlKey);
      const isSlash =
        e.key === '/' &&
        !(document.activeElement instanceof HTMLInputElement) &&
        !(document.activeElement instanceof HTMLTextAreaElement) &&
        !(document.activeElement as HTMLElement | null)?.isContentEditable;
      if (isCmdK || isSlash) {
        e.preventDefault();
        setOpen((v) => !v);
      }
    }
    document.addEventListener('keydown', onKey);
    return () => document.removeEventListener('keydown', onKey);
  }, []);

  // Lazy-load recent activity once on first open.
  useEffect(() => {
    if (!open || recents) return;
    void fetch('/api/dashboard/overview', { cache: 'no-store' })
      .then((r) => (r.ok ? r.json() : null))
      .then((j: OverviewResponse | null) => {
        if (j) setRecents(j);
      })
      .catch(() => {
        /* ignore */
      });
  }, [open, recents]);

  // Companies are loaded once on first open (the endpoint returns the
  // full active customer list — small enough to filter client-side).
  useEffect(() => {
    if (!open || allCompanies !== null) return;
    setCompaniesLoading(true);
    void fetch('/api/companies', { cache: 'no-store' })
      .then((r) => (r.ok ? r.json() : { companies: [] }))
      .then((j: { companies?: CompaniesApiRow[] }) => {
        const items: CompanyHit[] = (j.companies ?? []).map((c) => ({
          id: c.id,
          name: c.companyName,
        }));
        setAllCompanies(items);
      })
      .catch(() => setAllCompanies([]))
      .finally(() => setCompaniesLoading(false));
  }, [open, allCompanies]);

  const companyMatches = (() => {
    const q = query.trim().toLowerCase();
    if (q.length < 2 || !allCompanies) return [];
    return allCompanies
      .filter((c) => c.name.toLowerCase().includes(q))
      .slice(0, 8);
  })();

  const go = useCallback(
    (href: string) => {
      setOpen(false);
      router.push(href);
    },
    [router],
  );

  const visibleRoutes = ROUTES.filter((r) => !r.superAdminOnly || isSuperAdmin);

  return (
    <CommandDialog
      open={open}
      onOpenChange={setOpen}
      title="Search Pulse"
      description="Jump to any page, recent ticket, or company."
    >
      <CommandInput
        placeholder="Search pages, tickets, companies…"
        value={query}
        onValueChange={setQuery}
      />
      <CommandList>
        <CommandEmpty>No results.</CommandEmpty>

        <CommandGroup heading="Navigation">
          {visibleRoutes.map((r) => (
            <CommandItem
              key={r.href}
              value={`${r.label} ${r.keywords ?? ''}`}
              onSelect={() => go(r.href)}
            >
              <r.icon className="h-4 w-4" />
              <span>{r.label}</span>
              {r.hint && <CommandShortcut>{r.hint}</CommandShortcut>}
            </CommandItem>
          ))}
        </CommandGroup>

        {recents && recents.audits.length > 0 && (
          <>
            <CommandSeparator />
            <CommandGroup heading="Recent audits">
              {recents.audits.slice(0, 5).map((a) => (
                <CommandItem
                  key={a.id}
                  value={`audit ${a.hostname ?? ''} ${a.companyName ?? ''}`}
                  onSelect={() => go(`/analyzer/itglue/configurations`)}
                >
                  <Sparkles className="h-4 w-4" />
                  <span className="truncate">
                    {a.hostname ?? '(unanchored)'}
                    {a.companyName && (
                      <span className="text-muted-foreground"> · {a.companyName}</span>
                    )}
                  </span>
                </CommandItem>
              ))}
            </CommandGroup>
          </>
        )}

        {recents && recents.observations.length > 0 && (
          <>
            <CommandSeparator />
            <CommandGroup heading="Recent observations">
              {recents.observations.slice(0, 5).map((o) => (
                <CommandItem
                  key={o.id}
                  value={`observation ${o.hostname ?? ''} ${o.companyName ?? ''} ${o.kind}`}
                  onSelect={() => go('/configuration-items')}
                >
                  <Activity className="h-4 w-4" />
                  <span className="truncate">
                    {o.hostname ?? '(unanchored)'}
                    {o.companyName && (
                      <span className="text-muted-foreground"> · {o.companyName}</span>
                    )}
                  </span>
                </CommandItem>
              ))}
            </CommandGroup>
          </>
        )}

        {companyMatches.length > 0 && (
          <>
            <CommandSeparator />
            <CommandGroup heading="Companies">
              {companyMatches.map((c) => (
                <CommandItem
                  key={c.id}
                  value={`company ${c.name}`}
                  onSelect={() =>
                    go(
                      `/configuration-items?company=${encodeURIComponent(String(c.id))}`,
                    )
                  }
                >
                  <Building2 className="h-4 w-4" />
                  <span className="truncate">{c.name}</span>
                </CommandItem>
              ))}
            </CommandGroup>
          </>
        )}

        <CommandSeparator />
        <CommandGroup heading="Tip">
          <CommandItem disabled value="hint">
            <Plug className="h-4 w-4" />
            <span className="text-muted-foreground">Press</span>
            <CommandShortcut>⌘ K</CommandShortcut>
            <span className="text-muted-foreground">or</span>
            <CommandShortcut>/</CommandShortcut>
            <span className="text-muted-foreground">to open this panel anywhere.</span>
          </CommandItem>
        </CommandGroup>
      </CommandList>
    </CommandDialog>
  );
}