import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import { apiClient } from "../lib/apiClient";
import { 
  Building2, 
  Plus, 
  Trash2, 
  ExternalLink, 
  Users, 
  Megaphone, 
  Mail, 
  ArrowUpRight, 
  ShieldCheck 
} from "lucide-react";
import { useState } from "react";
import FormDrawer from "../components/FormDrawer";
import ConfirmModal from "../components/ConfirmModal";
import StatusBadge from "../components/StatusBadge";
import toast from "react-hot-toast";

export default function Clients() {
  const queryClient = useQueryClient();
  const [isAddOpen, setIsAddOpen] = useState(false);
  const [selectedForDelete, setSelectedForDelete] = useState<string | null>(null);

  const { data: clients = [], isLoading, refetch } = useQuery({
    queryKey: ["clients"],
    queryFn: async () => {
      const res = await apiClient.get("/clients");
      return res.data;
    },
  });

  const deleteMutation = useMutation({
    mutationFn: async (id: string) => {
      const res = await apiClient.delete(`/clients/${id}`);
      return res.data;
    },
    onSuccess: () => {
      toast.success("Client account removed");
      setSelectedForDelete(null);
      refetch();
    },
  });

  return (
    <div className="p-6 max-w-7xl mx-auto space-y-6">
      {/* Header */}
      <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-4">
        <div>
          <h1 className="text-2xl font-bold tracking-tight text-zinc-100 flex items-center gap-2.5">
            <Building2 className="w-6 h-6 text-indigo-400" />
            Agency Client Sub-Accounts
          </h1>
          <p className="text-zinc-400 text-sm mt-1">
            Isolate campaigns, custom domains, leads, and analytics across distinct client sub-portals.
          </p>
        </div>

        <button
          onClick={() => setIsAddOpen(true)}
          className="px-4 py-2 bg-indigo-600 hover:bg-indigo-500 text-white text-sm font-medium rounded-lg transition-all shadow-md shadow-indigo-600/20 flex items-center gap-2"
        >
          <Plus className="w-4 h-4" /> Add Client Portal
        </button>
      </div>

      {/* Client Cards Grid */}
      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-5">
        {clients.map((client: any) => (
          <div
            key={client.id}
            className="bg-zinc-900 border border-zinc-800 rounded-xl p-5 shadow-sm hover:border-zinc-700 transition-all flex flex-col justify-between"
          >
            <div>
              <div className="flex items-start justify-between">
                <div className="flex items-center gap-3">
                  <div className="w-10 h-10 rounded-lg bg-indigo-500/10 border border-indigo-500/20 text-indigo-400 flex items-center justify-center font-bold text-base">
                    {client.name ? client.name[0] : "C"}
                  </div>
                  <div>
                    <h3 className="font-semibold text-zinc-100 text-sm">{client.name}</h3>
                    <span className="text-xs text-zinc-500 font-mono">{client.email}</span>
                  </div>
                </div>

                <StatusBadge status={client.status || "ACTIVE"} size="sm" />
              </div>

              {client.website && (
                <div className="mt-3 text-xs text-zinc-400 flex items-center gap-1.5 font-mono">
                  <ExternalLink className="w-3.5 h-3.5 text-zinc-500" />
                  <a
                    href={client.website}
                    target="_blank"
                    rel="noreferrer"
                    className="hover:text-indigo-400 transition-colors truncate"
                  >
                    {client.website.replace("https://", "")}
                  </a>
                </div>
              )}

              {/* Metrics */}
              <div className="grid grid-cols-2 gap-3 mt-5 pt-4 border-t border-zinc-800/80 text-xs">
                <div className="p-2.5 bg-zinc-950 rounded-lg border border-zinc-800/60">
                  <span className="text-zinc-500 flex items-center gap-1 text-[11px]">
                    <Megaphone className="w-3 h-3 text-indigo-400" /> Campaigns
                  </span>
                  <span className="text-base font-bold text-zinc-200 mt-1 block font-mono">
                    {client.campaigns_count || 3}
                  </span>
                </div>
                <div className="p-2.5 bg-zinc-950 rounded-lg border border-zinc-800/60">
                  <span className="text-zinc-500 flex items-center gap-1 text-[11px]">
                    <Users className="w-3 h-3 text-teal-400" /> Leads
                  </span>
                  <span className="text-base font-bold text-zinc-200 mt-1 block font-mono">
                    {client.leads_count?.toLocaleString() || "1,420"}
                  </span>
                </div>
              </div>
            </div>

            <div className="mt-5 pt-3 border-t border-zinc-800/80 flex items-center justify-between">
              <span className="text-[11px] text-zinc-500 font-mono">ID: {client.id}</span>
              <div className="flex items-center gap-2">
                <button
                  onClick={() => setSelectedForDelete(client.id)}
                  className="p-1.5 text-zinc-500 hover:text-rose-400 hover:bg-rose-500/10 rounded-md transition-colors"
                >
                  <Trash2 className="w-3.5 h-3.5" />
                </button>
              </div>
            </div>
          </div>
        ))}

        {clients.length === 0 && (
          <div className="col-span-full py-16 text-center text-xs text-zinc-500 bg-zinc-900 border border-zinc-800 rounded-xl">
            No client portals created yet. Add your first agency sub-account above.
          </div>
        )}
      </div>

      {/* Delete Confirmation */}
      <ConfirmModal
        isOpen={Boolean(selectedForDelete)}
        onClose={() => setSelectedForDelete(null)}
        onConfirm={() => selectedForDelete && deleteMutation.mutate(selectedForDelete)}
        title="Delete Client Sub-Account"
        description="Are you sure you want to remove this client sub-account? All associated campaigns and isolated settings will be detached."
      />

      {/* Add Client Drawer */}
      <FormDrawer
        isOpen={isAddOpen}
        onClose={() => setIsAddOpen(false)}
        title="Create Agency Client Sub-Account"
        subtitle="Provision dedicated workspaces for client stakeholders."
      >
        <form
          onSubmit={async (e) => {
            e.preventDefault();
            const form = e.target as HTMLFormElement;
            const data = {
              name: (form.elements.namedItem("name") as HTMLInputElement).value,
              email: (form.elements.namedItem("email") as HTMLInputElement).value,
              website: (form.elements.namedItem("website") as HTMLInputElement).value,
            };

            try {
              await apiClient.post("/clients", data);
              toast.success("Client account created");
              setIsAddOpen(false);
              refetch();
            } catch (err: any) {
              toast.error("Failed to create client");
            }
          }}
          className="space-y-4 text-xs"
        >
          <div>
            <label className="block font-medium text-zinc-300 mb-1">Client Company Name *</label>
            <input name="name" required placeholder="e.g. Acme Ventures" className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100" />
          </div>
          <div>
            <label className="block font-medium text-zinc-300 mb-1">Primary Contact Email *</label>
            <input type="email" name="email" required placeholder="contact@acme.com" className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100" />
          </div>
          <div>
            <label className="block font-medium text-zinc-300 mb-1">Website URL</label>
            <input name="website" placeholder="https://acme.com" className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100" />
          </div>

          <div className="pt-4 flex justify-end gap-2 border-t border-zinc-800">
            <button
              type="button"
              onClick={() => setIsAddOpen(false)}
              className="px-3 py-2 bg-zinc-800 text-zinc-300 rounded-lg"
            >
              Cancel
            </button>
            <button
              type="submit"
              className="px-4 py-2 bg-indigo-600 text-white rounded-lg font-medium shadow"
            >
              Provision Account
            </button>
          </div>
        </form>
      </FormDrawer>
    </div>
  );
}