import { useState, useEffect } from "react";
import { 
  KeyRound, 
  CheckCircle2, 
  XCircle, 
  Menu, 
  Search, 
  Sparkles, 
  X, 
  ArrowRight,
  Megaphone,
  Users,
  Mail,
  Inbox,
  ShieldCheck,
  LayoutDashboard,
  CreditCard,
  Settings,
  Webhook,
  BarChart2,
  Building2,
  Flame
} from "lucide-react";
import { useApiKey } from "../context/ApiKeyContext";
import { useTheme } from "../context/ThemeContext";
import { Link, useNavigate } from "react-router-dom";
import { useQuery } from "@tanstack/react-query";
import { apiClient } from "../lib/apiClient";
import { MODULES, ModuleId, moduleHref } from "../modules/registry";

interface SearchItem {
  title: string;
  category: string;
  link: string;
  icon: any;
  shortcut?: string;
  detail?: string;
}

export default function TopBar({ onMenuClick, module = "e" }: { onMenuClick?: () => void; module?: ModuleId }) {
  const { apiKeys, activeKeyId, setActiveKeyId, activeKey } = useApiKey();
  const moduleDef = MODULES[module];
  const base = moduleDef.basePath;
  const { config } = useTheme();
  const [isSearchOpen, setIsSearchOpen] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");
  const navigate = useNavigate();

  // Fetch real data for dynamic search
  const { data: campaigns = [] } = useQuery({
    queryKey: ["campaigns"],
    queryFn: async () => {
      const res = await apiClient.get("/campaigns");
      return res.data || [];
    },
    enabled: isSearchOpen,
  });

  const { data: leads = [] } = useQuery({
    queryKey: ["leads-search-topbar"],
    queryFn: async () => {
      const res = await apiClient.get("/leads/search");
      return res.data || [];
    },
    enabled: isSearchOpen,
  });

  const { data: emailAccounts = [] } = useQuery({
    queryKey: ["email-accounts-topbar"],
    queryFn: async () => {
      const res = await apiClient.get("/email-accounts");
      return res.data || [];
    },
    enabled: isSearchOpen,
  });

  // Keyboard shortcut handlers: Cmd/Ctrl+K, Cmd/Ctrl+Shift+D (Dashboard), Cmd/Ctrl+Shift+I (Inbox), etc.
  useEffect(() => {
    const handleKeyDown = (e: KeyboardEvent) => {
      const isCmdOrCtrl = e.metaKey || e.ctrlKey;

      if (isCmdOrCtrl && e.key.toLowerCase() === "k") {
        e.preventDefault();
        setIsSearchOpen((prev) => !prev);
        return;
      }

      if (e.key === "Escape") {
        setIsSearchOpen(false);
        return;
      }

      // Quick navigation shortcuts when not typing in an input
      const targetTag = (e.target as HTMLElement)?.tagName?.toLowerCase();
      const isInput = targetTag === "input" || targetTag === "textarea" || targetTag === "select";

      if (!isInput) {
        if (isCmdOrCtrl && e.shiftKey && e.key.toLowerCase() === "d") {
          e.preventDefault();
          navigate(base);
        } else if (isCmdOrCtrl && e.shiftKey && e.key.toLowerCase() === "i") {
          e.preventDefault();
          navigate(moduleHref(module, "inbox"));
        } else if (isCmdOrCtrl && e.shiftKey && e.key.toLowerCase() === "l") {
          e.preventDefault();
          navigate(moduleHref(module, "leads"));
        } else if (isCmdOrCtrl && e.shiftKey && e.key.toLowerCase() === "c") {
          e.preventDefault();
          navigate(moduleHref(module, "campaigns"));
        }
      }
    };

    window.addEventListener("keydown", handleKeyDown);
    return () => window.removeEventListener("keydown", handleKeyDown);
  }, [navigate, base, module]);

  // Static navigation routes
  const navItems: SearchItem[] = [
    { title: `${moduleDef.label} Dashboard`, category: "Core Navigation", link: base, icon: LayoutDashboard, shortcut: "⌘⇧D" },
    { title: "Unified Inbox", category: "Core Navigation", link: moduleHref(module, "inbox"), icon: Inbox, shortcut: "⌘⇧I" },
    { title: "Lead Intelligence", category: "Core Navigation", link: moduleHref(module, "leads"), icon: Users, shortcut: "⌘⇧L" },
    { title: "Outbound Campaigns", category: "Core Navigation", link: moduleHref(module, "campaigns"), icon: Megaphone, shortcut: "⌘⇧C" },
    { title: "Email Accounts & Domains", category: "Core Navigation", link: moduleHref(module, "email-accounts"), icon: Mail },
    { title: "Autonomous Warmup Radar", category: "Core Navigation", link: moduleHref(module, "warmup"), icon: Flame },
    { title: "Deliverability Analytics", category: "Core Navigation", link: moduleHref(module, "analytics"), icon: BarChart2 },
    { title: "Agency Clients", category: "Core Navigation", link: moduleHref(module, "clients"), icon: Building2 },
    { title: "Credits & Billing", category: "Core Navigation", link: moduleHref(module, "pricing"), icon: CreditCard },
    { title: "Webhook Dispatcher", category: "Core Navigation", link: moduleHref(module, "webhooks"), icon: Webhook },
    { title: "System Settings", category: "Core Navigation", link: moduleHref(module, "settings"), icon: Settings },
  ];

  // Dynamic items from backend APIs
  const realCampaignItems: SearchItem[] = (Array.isArray(campaigns) ? campaigns : []).map((c: any) => ({
    title: c.name || "Campaign",
    category: "Campaigns",
    link: moduleHref(module, `campaigns/${c.id}`),
    icon: Megaphone,
    detail: `${c.lead_count || 0} leads • ${c.sent_count || 0} sent`
  }));

  const realLeadItems: SearchItem[] = (Array.isArray(leads) ? leads : []).slice(0, 8).map((l: any) => ({
    title: `${l.first_name || ""} ${l.last_name || ""}`.trim() || l.email,
    category: "Leads",
    link: moduleHref(module, "leads"),
    icon: Users,
    detail: `${l.company_name || ""} • ${l.email || ""}`
  }));

  const realInboxItems: SearchItem[] = (Array.isArray(emailAccounts) ? emailAccounts : []).map((e: any) => ({
    title: e.email || "Email Account",
    category: "Inboxes",
    link: moduleHref(module, "email-accounts"),
    icon: Mail,
    detail: `Status: ${e.status || "active"}`
  }));

  const allSearchItems: SearchItem[] = [
    ...navItems,
    ...realCampaignItems,
    ...realLeadItems,
    ...realInboxItems,
  ];

  const filteredItems = searchQuery
    ? allSearchItems.filter(
        (item) =>
          item.title.toLowerCase().includes(searchQuery.toLowerCase()) ||
          item.category.toLowerCase().includes(searchQuery.toLowerCase()) ||
          (item.detail && item.detail.toLowerCase().includes(searchQuery.toLowerCase()))
      )
    : allSearchItems;

  return (
    <header className="h-16 border-b border-white/5 bg-zinc-950/40 backdrop-blur-xl flex items-center justify-between px-4 md:px-6 shrink-0 relative z-30 shadow-[0_4px_24px_-4px_rgba(0,0,0,0.5)]">
      <div className="flex items-center gap-4">
        {onMenuClick && (
          <button 
            onClick={onMenuClick}
            className="p-2 -ml-2 text-zinc-400 hover:text-zinc-200 md:hidden"
            aria-label="Open navigation menu"
          >
            <Menu className="w-5 h-5" />
          </button>
        )}

        <div className="hidden sm:flex items-center gap-2 text-xs font-mono">
          <span className="text-zinc-500">SYSTEM</span>
          <span className="text-zinc-700">/</span>
          <span className="text-zinc-300 font-semibold tracking-wide flex items-center gap-1.5">
            <span className="w-1.5 h-1.5 rounded-full bg-emerald-400 animate-pulse shadow-[0_0_8px_var(--theme-accent,#00e5bc)]" />
            {moduleDef.engineLabel}
          </span>
        </div>
      </div>

      <div className="flex items-center gap-2 md:gap-3">
        {/* Global Search Button */}
        <button 
          onClick={() => setIsSearchOpen(true)}
          className="flex items-center gap-2 px-3 py-1.5 rounded-lg border border-white/5 bg-zinc-900/50 hover:bg-zinc-800/80 text-zinc-400 hover:text-white transition-all text-xs group"
          aria-label="Global search (Ctrl+K)"
        >
          <Search className="w-3.5 h-3.5 text-zinc-500 group-hover:text-white transition-colors" />
          <span className="hidden md:inline text-[11px]">Quick Search...</span>
          <kbd className="hidden md:inline text-[9px] font-mono px-1.5 py-0.5 rounded bg-black/40 border border-white/10 text-zinc-400">
            ⌘K
          </kbd>
        </button>

        {/* Reputation Shield Indicator */}
        <div className="hidden md:flex items-center gap-1.5 px-2.5 py-1 rounded-full bg-emerald-500/10 border border-emerald-500/20 text-[10px] font-bold uppercase tracking-wider text-emerald-400">
          <ShieldCheck className="w-3.5 h-3.5" />
          <span>Reputation 98.4%</span>
        </div>

        {/* API Status Pill */}
        <div className="flex items-center gap-2">
          {activeKey ? (
            <div 
              className="flex items-center gap-1.5 text-[10px] font-bold uppercase tracking-wider px-2.5 py-1 rounded-full border shadow-sm"
              style={{
                backgroundColor: config.badgeBg,
                borderColor: config.badgeBorder,
                color: config.badgeText,
              }}
            >
              <CheckCircle2 className="w-3 h-3" />
              API Connected
            </div>
          ) : (
            <div className="flex items-center gap-1.5 text-[10px] font-bold uppercase tracking-wider text-rose-300 bg-rose-500/10 border border-rose-500/20 px-2.5 py-1 rounded-full shadow-[0_0_10px_rgba(255,107,107,0.3)]">
              <XCircle className="w-3 h-3" />
              Key Missing
            </div>
          )}
        </div>

        {/* User Profile Avatar */}
        <div 
          className="w-8 h-8 flex items-center justify-center rounded-lg border text-[10px] font-bold font-mono transition-transform hover:scale-105"
          style={{
            backgroundColor: config.badgeBg,
            borderColor: config.badgeBorder,
            color: config.accent,
          }}
        >
          JM
        </div>

        <div className="h-5 w-px bg-white/10 mx-1 hidden sm:block" />

        {/* Key switcher */}
        <div className="hidden sm:flex items-center gap-1.5">
          <KeyRound className="w-3.5 h-3.5" style={{ color: config.accent }} />
          <select
            value={activeKeyId || ""}
            onChange={(e) => setActiveKeyId(e.target.value)}
            className="bg-white/5 border border-white/10 rounded-lg py-1.5 pl-2 pr-6 text-xs text-zinc-200 focus:outline-none w-28 md:w-36 transition-all hover:bg-white/10 font-mono"
            style={{
              borderColor: activeKey ? config.badgeBorder : undefined
            }}
          >
            <option value="" disabled className="bg-zinc-950">Select Key...</option>
            {apiKeys.map((key) => (
              <option key={key.id} value={key.id} className="bg-zinc-950">
                {key.name}
              </option>
            ))}
          </select>
        </div>
      </div>

      {/* Global Quick Search Modal */}
      {isSearchOpen && (
        <div 
          className="fixed inset-0 bg-black/70 backdrop-blur-md z-50 flex items-start justify-center pt-20 p-4 animate-fadeIn"
          onClick={() => setIsSearchOpen(false)}
        >
          <div 
            className="bg-zinc-900 border border-white/10 rounded-2xl w-full max-w-xl shadow-2xl overflow-hidden animate-slideDown"
            onClick={(e) => e.stopPropagation()}
          >
            <div className="flex items-center px-4 py-3.5 border-b border-white/10 gap-3">
              <Search className="w-4 h-4 text-zinc-400" />
              <input
                autoFocus
                value={searchQuery}
                onChange={(e) => setSearchQuery(e.target.value)}
                placeholder="Search campaigns, prospects, mailboxes, routes..."
                className="w-full bg-transparent text-sm text-white placeholder:text-zinc-500 focus:outline-none"
              />
              {searchQuery && (
                <button onClick={() => setSearchQuery("")} className="text-zinc-500 hover:text-white">
                  <X className="w-4 h-4" />
                </button>
              )}
              <kbd className="text-[10px] font-mono px-1.5 py-0.5 rounded bg-black/40 border border-white/10 text-zinc-400">
                ESC
              </kbd>
            </div>

            <div className="max-h-80 overflow-y-auto p-2 divide-y divide-white/5">
              {filteredItems.length === 0 ? (
                <div className="p-8 text-center text-xs text-zinc-500">
                  No matching telemetry found for "{searchQuery}"
                </div>
              ) : (
                filteredItems.map((item, idx) => (
                  <button
                    key={idx}
                    onClick={() => {
                      setIsSearchOpen(false);
                      navigate(item.link);
                    }}
                    className="w-full flex items-center justify-between p-3 rounded-xl hover:bg-white/5 text-left group transition-all"
                  >
                    <div className="flex items-center gap-3">
                      <div 
                        className="p-2 rounded-lg bg-black/40 border border-white/5 text-zinc-400 group-hover:text-emerald-400 group-hover:border-emerald-500/30 transition-all"
                      >
                        <item.icon className="w-4 h-4" />
                      </div>
                      <div>
                        <div className="text-xs font-bold text-white group-hover:text-emerald-400 transition-colors flex items-center gap-2">
                          <span>{item.title}</span>
                          {item.shortcut && (
                            <kbd className="text-[9px] font-mono px-1.5 py-0.5 rounded bg-emerald-500/10 border border-emerald-500/20 text-emerald-400 font-bold">
                              {item.shortcut}
                            </kbd>
                          )}
                        </div>
                        <div className="text-[10px] text-zinc-500 font-mono flex items-center gap-2 mt-0.5">
                          <span className="text-zinc-400 font-semibold">{item.category}</span>
                          {item.detail && (
                            <>
                              <span>•</span>
                              <span>{item.detail}</span>
                            </>
                          )}
                        </div>
                      </div>
                    </div>
                    <ArrowRight className="w-3.5 h-3.5 text-zinc-600 group-hover:text-white group-hover:translate-x-1 transition-all" />
                  </button>
                ))
              )}
            </div>
          </div>
        </div>
      )}
    </header>
  );
}