"use client";
import { useEffect, useState } from "react";
import { useParams } from "next/navigation";
import { Mail, UserCog, Clock, Plus } from "lucide-react";
import { api } from "@/lib/api";

const LIFECYCLE = ["active", "grace", "archived", "deleted"];

export default function OrgDetail() {
  const { org_id } = useParams<{ org_id: string }>();
  const [d, setD] = useState<any>(null);
  const [hist, setHist] = useState<any>(null);
  const [notes, setNotes] = useState<any[]>([]);
  const [note, setNote] = useState("");
  const [toast, setToast] = useState("");

  function load() {
    api(`/admin/organizations/${org_id}`).then(setD).catch(() => {});
    api(`/admin/organizations/${org_id}/history`).then(setHist).catch(() => {});
    api(`/admin/organizations/${org_id}/notes`).then(setNotes).catch(() => setNotes([]));
  }
  useEffect(() => { load(); }, [org_id]);

  async function addNote() {
    if (!note.trim()) return;
    await api(`/admin/organizations/${org_id}/notes`, { method: "POST", body: JSON.stringify({ note }) });
    setNote(""); load();
  }
  async function sendReminder() {
    const r = await api(`/admin/organizations/${org_id}/send-reminder`, { method: "POST" });
    setToast(`Reminder sent to ${r.to}`);
    setTimeout(() => setToast(""), 2500);
  }
  async function extend() {
    await api(`/admin/organizations/${org_id}/subscription`, { method: "PUT", body: JSON.stringify({ extend_days: 30 }) });
    setToast("Subscription extended 30 days"); load();
    setTimeout(() => setToast(""), 2500);
  }
  async function impersonate() {
    const r = await api(`/admin/organizations/${org_id}/impersonate`, { method: "POST" });
    setToast(r.message);
    setTimeout(() => setToast(""), 2500);
  }

  if (!d) return <div className="text-slate-400">Loading…</div>;
  const curStage = LIFECYCLE.indexOf(d.subscription_status);

  return (
    <div className="space-y-5">
      {toast && <div className="card p-3 bg-emerald-50 border-emerald-200 text-emerald-800 text-sm">{toast}</div>}

      <div className="flex items-center justify-between">
        <div>
          <h2 className="text-xl font-bold">{d.name}</h2>
          <p className="text-sm text-slate-500 capitalize">{d.plan} · {d.subscription_status}</p>
        </div>
        <div className="flex gap-2">
          <button onClick={extend} className="flex items-center gap-2 border border-slate-200 px-3 py-1.5 rounded-lg text-sm font-medium"><Clock className="h-4 w-4" /> Extend 30d</button>
          <button onClick={sendReminder} className="flex items-center gap-2 border border-slate-200 px-3 py-1.5 rounded-lg text-sm font-medium"><Mail className="h-4 w-4" /> Send reminder</button>
          <button onClick={impersonate} className="flex items-center gap-2 bg-brand-600 text-white px-3 py-1.5 rounded-lg text-sm font-semibold"><UserCog className="h-4 w-4" /> Impersonate</button>
        </div>
      </div>

      {/* Lifecycle timeline */}
      <div className="card p-5">
        <h3 className="font-bold mb-4">Subscription Lifecycle</h3>
        <div className="flex items-center">
          {LIFECYCLE.map((stage, i) => (
            <div key={stage} className="flex items-center flex-1 last:flex-none">
              <div className="flex flex-col items-center">
                <div className={`h-9 w-9 rounded-full grid place-items-center text-xs font-bold capitalize
                  ${i <= curStage ? "bg-brand-600 text-white" : "bg-slate-100 text-slate-400"}`}>
                  {i + 1}
                </div>
                <span className="text-xs mt-1 capitalize text-slate-500">{stage}</span>
              </div>
              {i < LIFECYCLE.length - 1 && (
                <div className={`flex-1 h-0.5 mx-2 ${i < curStage ? "bg-brand-600" : "bg-slate-200"}`} />
              )}
            </div>
          ))}
        </div>
      </div>

      {/* Utilization */}
      <div className="grid sm:grid-cols-3 gap-4">
        <UtilBar label="Products" used={d.products_used} limit={d.product_limit} />
        <UtilBar label="Users" used={d.users_used} limit={d.user_limit} />
        <UtilBar label="Storage (GB)" used={d.storage_used_gb} limit={d.storage_total_gb} />
      </div>
      <div className="grid sm:grid-cols-3 gap-4">
        <Stat label="QR Codes" value={d.qr_codes} />
        <Stat label="Total Scans" value={d.total_scans} />
        <Stat label="Plan Price" value={`₹${d.plan_price}`} />
      </div>

      {/* Admins */}
      <div className="card p-5">
        <h3 className="font-bold mb-3">Admin Users</h3>
        <div className="space-y-2 text-sm">
          {(d.admins ?? []).map((a: any, i: number) => (
            <div key={i} className="flex justify-between border-b border-slate-100 py-2">
              <span>{a.name} <span className="text-slate-400">({a.email})</span></span>
              <span className="text-slate-500">{a.last_login ? new Date(a.last_login).toLocaleDateString() : "never"}</span>
            </div>
          ))}
          {(!d.admins || d.admins.length === 0) && <p className="text-slate-400">No admins.</p>}
        </div>
      </div>

      {/* History */}
      {hist && (
        <div className="grid md:grid-cols-2 gap-4">
          <div className="card p-5">
            <h3 className="font-bold mb-3">Invoices</h3>
            <div className="space-y-1 text-sm">
              {hist.invoices.map((i: any, k: number) => (
                <div key={k} className="flex justify-between border-b border-slate-100 py-1.5">
                  <span className="font-mono">{i.invoice_number}</span>
                  <span>₹{i.total} · <span className="capitalize text-slate-500">{i.status}</span></span>
                </div>
              ))}
              {hist.invoices.length === 0 && <p className="text-slate-400">No invoices.</p>}
            </div>
          </div>
          <div className="card p-5">
            <h3 className="font-bold mb-3">Plan History</h3>
            <div className="space-y-1 text-sm">
              {hist.plan_history.map((h: any, k: number) => (
                <div key={k} className="flex justify-between border-b border-slate-100 py-1.5">
                  <span>{h.from ?? "—"} → {h.to}</span>
                  <span className="text-slate-400">{new Date(h.at).toLocaleDateString()}</span>
                </div>
              ))}
              {hist.plan_history.length === 0 && <p className="text-slate-400">No changes.</p>}
            </div>
          </div>
        </div>
      )}

      {/* Support notes */}
      <div className="card p-5">
        <h3 className="font-bold mb-3">Internal Support Notes</h3>
        <div className="flex gap-2 mb-3">
          <input value={note} onChange={(e) => setNote(e.target.value)} placeholder="Add an internal note…"
            className="flex-1 px-3 py-2 rounded-lg border border-slate-200 text-sm" />
          <button onClick={addNote} className="flex items-center gap-1 bg-brand-600 text-white px-3 py-2 rounded-lg text-sm font-semibold">
            <Plus className="h-4 w-4" /> Add
          </button>
        </div>
        <div className="space-y-2">
          {notes.map((n) => (
            <div key={n.id} className="text-sm border-b border-slate-100 py-2">
              <div>{n.note}</div>
              <div className="text-xs text-slate-400">{n.author} · {new Date(n.at).toLocaleString()}</div>
            </div>
          ))}
          {notes.length === 0 && <p className="text-sm text-slate-400">No notes yet.</p>}
        </div>
      </div>
    </div>
  );
}

function UtilBar({ label, used, limit }: { label: string; used: number; limit: number | null }) {
  const pct = limit == null ? 8 : Math.min(100, Math.round((used / limit) * 100));
  return (
    <div className="card p-4">
      <div className="flex justify-between text-sm mb-1">
        <span className="text-slate-600">{label}</span>
        <span className="text-slate-500">{used} / {limit ?? "∞"}</span>
      </div>
      <div className="h-2 rounded-full bg-slate-100">
        <div className="h-full rounded-full bg-brand-500" style={{ width: `${pct}%` }} />
      </div>
    </div>
  );
}
function Stat({ label, value }: any) {
  return (
    <div className="card p-4">
      <div className="text-sm text-slate-500">{label}</div>
      <div className="text-2xl font-extrabold mt-1">{value}</div>
    </div>
  );
}