import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import { apiClient } from "../lib/apiClient";
import { 
  Plus, 
  Search, 
  Megaphone, 
  Play, 
  Pause, 
  Square, 
  Trash2, 
  ArrowUpRight, 
  Sliders, 
  Clock, 
  Globe, 
  CheckCircle2,
  MailCheck
} from "lucide-react";
import { useState } from "react";
import { Link } from "react-router-dom";
import StatusBadge from "../components/StatusBadge";
import ConfirmModal from "../components/ConfirmModal";
import FormDrawer from "../components/FormDrawer";
import toast from "react-hot-toast";

export default function Campaigns() {
  const queryClient = useQueryClient();
  const [searchTerm, setSearchTerm] = useState("");
  const [statusFilter, setStatusFilter] = useState("ALL");
  const [isCreateOpen, setIsCreateOpen] = useState(false);
  const [selectedForDelete, setSelectedForDelete] = useState<string | null>(null);

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

  const updateStatusMutation = useMutation({
    mutationFn: async ({ id, status }: { id: string; status: "START" | "PAUSE" | "STOP" }) => {
      const res = await apiClient.post(`/campaigns/${id}/status`, { status });
      return res.data;
    },
    onSuccess: (_, variables) => {
      const statusLabel = variables.status === "START" ? "started" : variables.status === "PAUSE" ? "paused" : "stopped";
      toast.success(`Campaign ${statusLabel}`);
      queryClient.invalidateQueries({ queryKey: ["campaigns"] });
    },
    onError: (err: any) => {
      toast.error(err.response?.data?.error || "Failed to update campaign status");
    }
  });

  const deleteMutation = useMutation({
    mutationFn: async (id: string) => {
      const res = await apiClient.delete(`/campaigns/${id}`);
      return res.data;
    },
    onSuccess: () => {
      toast.success("Campaign removed");
      setSelectedForDelete(null);
      queryClient.invalidateQueries({ queryKey: ["campaigns"] });
    },
    onError: (err: any) => {
      toast.error(err.response?.data?.error || "Failed to delete campaign");
    }
  });

  const filteredCampaigns = (campaigns || []).filter((c: any) => {
    const matchesSearch = c.name?.toLowerCase().includes(searchTerm.toLowerCase());
    const matchesStatus = statusFilter === "ALL" || c.status === statusFilter;
    return matchesSearch && matchesStatus;
  });

  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">
            <Megaphone className="w-6 h-6 text-indigo-400" />
            Outreach Campaigns
          </h1>
          <p className="text-zinc-400 text-sm mt-1">
            Automated multi-step cold email sequences with A/B variant testing.
          </p>
        </div>

        <button
          onClick={() => setIsCreateOpen(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 self-start sm:self-auto"
        >
          <Plus className="w-4 h-4" />
          Create Campaign
        </button>
      </div>

      {/* Filter and Search Bar */}
      <div className="bg-white/5 border border-white/10 backdrop-blur-md rounded-xl p-4 flex flex-col sm:flex-row items-stretch sm:items-center justify-between gap-3 shadow-[0_8px_32px_-8px_rgba(6,10,12,0.65)]">
        <div className="relative flex-1 max-w-md">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-zinc-400" />
          <input
            type="text"
            placeholder="Search campaigns by name..."
            value={searchTerm}
            onChange={(e) => setSearchTerm(e.target.value)}
            className="w-full bg-black/40 border border-white/5 rounded-lg py-2 pl-9 pr-4 text-sm text-zinc-100 placeholder:text-zinc-500 focus:outline-none focus:border-indigo-500 focus:ring-1 focus:ring-indigo-500 shadow-[inset_0_1px_1px_rgba(246,248,242,0.02)] transition-all"
          />
        </div>

        <div className="flex items-center gap-2">
          {["ALL", "ACTIVE", "PAUSED", "STOPPED"].map((status) => (
            <button
              key={status}
              onClick={() => setStatusFilter(status)}
              className={`px-3 py-1.5 rounded-lg text-xs font-medium transition-all duration-300 shadow-[inset_0_1px_1px_rgba(246,248,242,0.02)] ${
                statusFilter === status
                  ? "bg-indigo-600 text-white shadow-[0_0_12px_rgba(37,125,104,0.5)] border border-indigo-500/50"
                  : "bg-black/40 text-zinc-400 hover:text-zinc-200 border border-white/5"
              }`}
            >
              {status}
            </button>
          ))}
        </div>
      </div>

      {/* Campaigns Table */}
      <div className="bg-white/5 border border-white/10 backdrop-blur-md rounded-xl overflow-hidden shadow-[0_8px_32px_-8px_rgba(6,10,12,0.65)]">
        {isLoading ? (
          <div className="py-20 flex flex-col items-center justify-center gap-3">
            <div className="w-8 h-8 rounded-full border-2 border-indigo-500 border-t-transparent animate-spin drop-shadow-[0_0_8px_rgba(63,156,132,0.5)]" />
            <p className="text-sm text-zinc-400">Loading campaign records...</p>
          </div>
        ) : filteredCampaigns.length > 0 ? (
          <div className="overflow-x-auto">
            <table className="w-full text-sm text-left">
              <thead className="bg-black/20 border-b border-white/5 text-zinc-400 text-xs uppercase font-sans tracking-wider">
                <tr>
                  <th className="px-6 py-3.5 font-semibold">Campaign Name</th>
                  <th className="px-6 py-3.5 font-semibold">Status</th>
                  <th className="px-6 py-3.5 font-semibold">Leads</th>
                  <th className="px-6 py-3.5 font-semibold">Sent</th>
                  <th className="px-6 py-3.5 font-semibold">Opens</th>
                  <th className="px-6 py-3.5 font-semibold">Replies</th>
                  <th className="px-6 py-3.5 font-semibold">Bounces</th>
                  <th className="px-6 py-3.5 font-semibold text-right">Actions</th>
                </tr>
              </thead>
              <tbody className="divide-y divide-white/5">
                {filteredCampaigns.map((camp: any) => (
                  <tr key={camp.id} className="hover:bg-white/5 transition-colors">
                    <td className="px-6 py-4">
                      <Link
                        to={`/campaigns/${camp.id}`}
                        className="font-semibold text-zinc-100 hover:text-indigo-400 transition-colors flex items-center gap-1.5"
                      >
                        {camp.name}
                        <ArrowUpRight className="w-3.5 h-3.5 text-zinc-500" />
                      </Link>
                      <div className="text-[11px] text-zinc-400 mt-0.5 font-sans">
                        Schedule: <span className="font-mono">{camp.start_schedule || "09:00"} - {camp.end_schedule || "17:00"}</span> ({camp.timezone || "America/New_York"})
                      </div>
                    </td>
                    <td className="px-6 py-4">
                      <StatusBadge status={camp.status} />
                    </td>
                    <td className="px-6 py-4 font-mono text-zinc-300">
                      {camp.lead_count?.toLocaleString() || 0}
                    </td>
                    <td className="px-6 py-4 font-mono text-zinc-300">
                      {camp.sent_count?.toLocaleString() || 0}
                    </td>
                    <td className="px-6 py-4 font-mono text-emerald-400 drop-shadow-[0_0_8px_rgba(63,156,132,0.3)]">
                      {camp.open_count?.toLocaleString() || 0}
                    </td>
                    <td className="px-6 py-4 font-mono text-purple-400 font-semibold drop-shadow-[0_0_8px_rgba(178,87,49,0.3)]">
                      {camp.reply_count?.toLocaleString() || 0}
                    </td>
                    <td className="px-6 py-4 font-mono text-rose-400 drop-shadow-[0_0_8px_rgba(203,117,80,0.3)]">
                      {camp.bounce_count || 0}
                    </td>
                    <td className="px-6 py-4 text-right">
                      <div className="flex items-center justify-end gap-1.5">
                        {camp.status === "ACTIVE" ? (
                          <button
                            onClick={() => updateStatusMutation.mutate({ id: camp.id, status: "PAUSE" })}
                            title="Pause Campaign"
                            className="p-1.5 bg-black/40 hover:bg-amber-500/20 text-zinc-400 hover:text-amber-400 rounded-md transition-colors border border-white/5 hover:border-amber-500/30"
                          >
                            <Pause className="w-3.5 h-3.5" />
                          </button>
                        ) : (
                          <button
                            onClick={() => updateStatusMutation.mutate({ id: camp.id, status: "START" })}
                            title="Start Campaign"
                            className="p-1.5 bg-black/40 hover:bg-emerald-500/20 text-zinc-400 hover:text-emerald-400 rounded-md transition-colors border border-white/5 hover:border-emerald-500/30"
                          >
                            <Play className="w-3.5 h-3.5" />
                          </button>
                        )}
                        <button
                          onClick={() => updateStatusMutation.mutate({ id: camp.id, status: "STOP" })}
                          title="Stop Campaign"
                          className="p-1.5 bg-black/40 hover:bg-rose-500/20 text-zinc-400 hover:text-rose-400 rounded-md transition-colors border border-white/5 hover:border-rose-500/30"
                        >
                          <Square className="w-3.5 h-3.5" />
                        </button>
                        <button
                          onClick={() => setSelectedForDelete(camp.id)}
                          title="Delete Campaign"
                          className="p-1.5 bg-black/40 hover:bg-rose-500/20 text-zinc-400 hover:text-rose-400 rounded-md transition-colors border border-white/5 hover:border-rose-500/30"
                        >
                          <Trash2 className="w-3.5 h-3.5" />
                        </button>
                      </div>
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        ) : (
          <div className="py-16 text-center">
            <Megaphone className="w-12 h-12 text-zinc-600 mx-auto mb-3" />
            <h3 className="text-base font-medium text-zinc-300">No campaigns found</h3>
            <p className="text-xs text-zinc-500 mt-1 max-w-sm mx-auto font-sans">
              Create your first campaign to begin dispatching automated cold outreach sequences.
            </p>
            <button
              onClick={() => setIsCreateOpen(true)}
              className="mt-4 px-4 py-2 bg-indigo-600 hover:bg-indigo-500 text-white text-xs font-medium rounded-lg transition-colors shadow-[0_0_12px_rgba(37,125,104,0.5)] border border-indigo-500/50"
            >
              Create Campaign
            </button>
          </div>
        )}
      </div>

      {/* Delete Campaign Confirmation */}
      <ConfirmModal
        isOpen={Boolean(selectedForDelete)}
        onClose={() => setSelectedForDelete(null)}
        onConfirm={() => selectedForDelete && deleteMutation.mutate(selectedForDelete)}
        title="Delete Campaign"
        description="Are you sure you want to permanently delete this campaign and all associated sequences? This action cannot be undone."
        confirmText="Delete Campaign"
        isDestructive={true}
        isLoading={deleteMutation.isPending}
      />

      {/* Full Multi-Step Create Campaign Drawer */}
      <FormDrawer
        isOpen={isCreateOpen}
        onClose={() => setIsCreateOpen(false)}
        title="Launch New Campaign"
        subtitle="Configure schedule parameters, tracking domain, and initial sequence step."
      >
        <form
          onSubmit={async (e) => {
            e.preventDefault();
            const form = e.target as HTMLFormElement;
            const data = {
              name: (form.elements.namedItem("name") as HTMLInputElement).value,
              timezone: (form.elements.namedItem("timezone") as HTMLSelectElement).value,
              start_schedule: (form.elements.namedItem("start_schedule") as HTMLInputElement).value,
              end_schedule: (form.elements.namedItem("end_schedule") as HTMLInputElement).value,
              track_settings: (form.elements.namedItem("track_settings") as HTMLSelectElement).value,
              send_as_plain_text: (form.elements.namedItem("send_as_plain_text") as HTMLInputElement).checked,
              follow_up_percentage: Number((form.elements.namedItem("follow_up_percentage") as HTMLInputElement).value),
              unsubscribe_text: (form.elements.namedItem("unsubscribe_text") as HTMLInputElement).value,
              stop_lead_settings: (form.elements.namedItem("stop_lead_settings") as HTMLSelectElement).value,
              initial_subject: (form.elements.namedItem("subject") as HTMLInputElement).value,
              initial_body: (form.elements.namedItem("body") as HTMLTextAreaElement).value,
            };

            try {
              await apiClient.post("/campaigns", data);
              toast.success("Campaign launched successfully");
              setIsCreateOpen(false);
              queryClient.invalidateQueries({ queryKey: ["campaigns"] });
            } catch (err: any) {
              toast.error(err.response?.data?.error || "Failed to create campaign");
            }
          }}
          className="space-y-5 text-sm"
        >
          <div>
            <label className="block font-medium text-zinc-300 mb-1">Campaign Name *</label>
            <input
              name="name"
              required
              placeholder="e.g. Enterprise Founders Outbound"
              className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500"
            />
          </div>

          <div className="grid grid-cols-2 gap-3">
            <div>
              <label className="block font-medium text-zinc-300 mb-1">Start Time</label>
              <input
                type="time"
                name="start_schedule"
                defaultValue="09:00"
                className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500"
              />
            </div>
            <div>
              <label className="block font-medium text-zinc-300 mb-1">End Time</label>
              <input
                type="time"
                name="end_schedule"
                defaultValue="17:00"
                className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500"
              />
            </div>
          </div>

          <div>
            <label className="block font-medium text-zinc-300 mb-1">Timezone</label>
            <select
              name="timezone"
              defaultValue="America/New_York"
              className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500"
            >
              <option value="America/New_York">America/New_York (EST)</option>
              <option value="America/Chicago">America/Chicago (CST)</option>
              <option value="America/Los_Angeles">America/Los_Angeles (PST)</option>
              <option value="Europe/London">Europe/London (GMT)</option>
              <option value="Europe/Paris">Europe/Paris (CET)</option>
              <option value="Asia/Singapore">Asia/Singapore (SGT)</option>
            </select>
          </div>

          <div>
            <label className="block font-medium text-zinc-300 mb-1">Tracking Settings</label>
            <select
              name="track_settings"
              defaultValue="TRACK_EMAIL_OPEN_AND_CLICK"
              className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500"
            >
              <option value="TRACK_EMAIL_OPEN_AND_CLICK">Track Opens and Clicks</option>
              <option value="TRACK_EMAIL_OPEN">Track Email Opens Only</option>
              <option value="TRACK_EMAIL_CLICK">Track Email Clicks Only</option>
              <option value="DONT_TRACK_EMAIL_OPEN">Do Not Track Opens or Clicks</option>
            </select>
          </div>

          <div className="flex items-center justify-between p-3 bg-zinc-900 border border-zinc-800 rounded-lg">
            <div>
              <span className="font-medium text-zinc-200 block text-xs">Send as Plain Text</span>
              <span className="text-[11px] text-zinc-500">Improves deliverability in strict enterprise inboxes</span>
            </div>
            <input
              type="checkbox"
              name="send_as_plain_text"
              className="w-4 h-4 rounded text-indigo-600 focus:ring-indigo-500 bg-zinc-950 border-zinc-700"
            />
          </div>

          <div>
            <div className="flex justify-between text-xs font-medium text-zinc-300 mb-1">
              <span>Follow-up Distribution %</span>
              <span>85%</span>
            </div>
            <input
              type="range"
              name="follow_up_percentage"
              min="10"
              max="100"
              defaultValue="85"
              className="w-full accent-indigo-500"
            />
          </div>

          <div>
            <label className="block font-medium text-zinc-300 mb-1">Unsubscribe Message</label>
            <input
              name="unsubscribe_text"
              defaultValue="Reply unsubscribe if you prefer not to receive updates."
              className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500 text-xs"
            />
          </div>

          <div>
            <label className="block font-medium text-zinc-300 mb-1">Stop Lead Condition</label>
            <select
              name="stop_lead_settings"
              defaultValue="REPLIED"
              className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500 text-xs"
            >
              <option value="REPLIED">Stop sequence once lead replies</option>
              <option value="OPENED">Stop sequence once lead opens email</option>
              <option value="CLICKED">Stop sequence once lead clicks a link</option>
            </select>
          </div>

          <div className="pt-2 border-t border-zinc-800 space-y-3">
            <h4 className="text-xs font-semibold uppercase text-zinc-400">Step 1 Sequence Setup</h4>
            <div>
              <label className="block font-medium text-zinc-300 mb-1">Subject Line</label>
              <input
                name="subject"
                required
                defaultValue="Quick sync for {{first_name}}"
                className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500 text-xs"
              />
            </div>
            <div>
              <label className="block font-medium text-zinc-300 mb-1">Email Body</label>
              <textarea
                name="body"
                rows={3}
                required
                defaultValue="<p>Hi {{first_name}},</p><p>Wanted to see how {{company_name}} is optimizing outbound deliverability?</p>"
                className="w-full bg-zinc-900 border border-zinc-800 rounded-lg p-2.5 text-zinc-100 focus:outline-none focus:border-indigo-500 font-mono text-xs"
              />
            </div>
          </div>

          <div className="pt-4 flex justify-end gap-3 border-t border-zinc-800">
            <button
              type="button"
              onClick={() => setIsCreateOpen(false)}
              className="px-4 py-2 bg-zinc-800 hover:bg-zinc-700 text-zinc-300 rounded-lg text-xs"
            >
              Cancel
            </button>
            <button
              type="submit"
              className="px-4 py-2 bg-indigo-600 hover:bg-indigo-500 text-white font-medium rounded-lg text-xs shadow-md"
            >
              Launch Campaign
            </button>
          </div>
        </form>
      </FormDrawer>
    </div>
  );
}