import { useEffect, useState } from "react";
import { RefreshCw, Instagram, Facebook } from "lucide-react";
import { api } from "../api.js";
import { Button, cx, Dialog, Empty, ErrorNote, Field, fmt, Spinner } from "../ui.jsx";

/** Pick a Facebook Page the agency can manage → create the client's folder, brand files and link. */
export default function AddClientDialog({ open, onClose, onAdded }) {
  const [accounts, setAccounts] = useState(null);
  const [error, setError] = useState(null);
  const [picked, setPicked] = useState(null);
  const [name, setName] = useState("");
  const [runAudit, setRunAudit] = useState(true);
  const [busy, setBusy] = useState(false);

  const load = (refresh) => {
    setAccounts(null);
    setError(null);
    api(`/api/accounts/unlinked${refresh ? "?refresh=1" : ""}`).then((r) => setAccounts(r.accounts)).catch(setError);
  };
  useEffect(() => {
    if (open) { load(false); setPicked(null); setName(""); }
  }, [open]);

  const add = async () => {
    setBusy(true);
    setError(null);
    try {
      const r = await api("/api/clients", { method: "POST", body: { accountId: picked.account_id, name, runAudit } });
      onClose();
      onAdded?.(r.client);
    } catch (e) {
      setError(e);
    } finally {
      setBusy(false);
    }
  };

  return (
    <Dialog
      open={open}
      onClose={onClose}
      title="Add a business"
      footer={
        <>
          <Button onClick={onClose}>Cancel</Button>
          <Button variant="primary" disabled={!picked} loading={busy} onClick={add}>
            Create client
          </Button>
        </>
      }
    >
      <p className="text-muted text-[13px] mb-3">
        Pages connected to the agency's Meta account that don't have a client folder yet. Connect new Pages in Meta Business Suite first.
      </p>
      <ErrorNote error={error} className="mb-3" />
      <div className="flex justify-end mb-2">
        <Button size="sm" variant="ghost" icon={RefreshCw} onClick={() => load(true)}>Check Meta again</Button>
      </div>
      {!accounts && !error ? (
        <Spinner label="Asking Meta…" />
      ) : accounts?.length === 0 ? (
        <Empty title="Every connected Page already has a client">Add the new business's Page to the agency's Meta Business account, then check again.</Empty>
      ) : (
        <ul className="border border-line rounded-lg divide-y divide-line max-h-[260px] overflow-y-auto">
          {accounts?.map((a) => (
            <li key={a.account_id}>
              <button
                onClick={() => { setPicked(a); setName(a.page_name); }}
                className={cx("w-full text-left px-3.5 py-2.5 flex items-center gap-3", picked?.account_id === a.account_id ? "bg-brand-soft" : "hover:bg-[#f8fafc]")}
              >
                <span className={cx("size-4 rounded-full border-2 shrink-0", picked?.account_id === a.account_id ? "border-brand bg-brand shadow-[inset_0_0_0_2px_white]" : "border-line-strong")} />
                <span className="min-w-0 flex-1">
                  <span className="block font-medium truncate">{a.page_name}</span>
                  <span className="flex gap-3 text-[12px] text-muted">
                    {a.page_id ? <span className="inline-flex items-center gap-1"><Facebook className="size-3" />{a.category || "Page"}</span> : <span>Instagram only · no Facebook Page</span>}
                    {a.instagram ? (
                      <span className="inline-flex items-center gap-1"><Instagram className="size-3" />@{a.instagram.username} · {fmt(a.instagram.followers_count)} followers</span>
                    ) : (
                      <span>no Instagram linked</span>
                    )}
                  </span>
                </span>
              </button>
            </li>
          ))}
        </ul>
      )}
      {picked && (
        <div className="mt-4 space-y-3">
          <Field label="Client name" hint="Used for the folder, reports and AI runs.">
            <input className="input" value={name} onChange={(e) => setName(e.target.value)} />
          </Field>
          <label className="flex items-start gap-2 text-[13px]">
            <input type="checkbox" className="mt-0.5 accent-brand" checked={runAudit} onChange={(e) => setRunAudit(e.target.checked)} />
            <span>
              Run the first account audit now
              <span className="block text-muted text-[12px]">Claude drafts brand.md, the internal and client audits and the branded PDFs. Takes a few minutes.</span>
            </span>
          </label>
        </div>
      )}
    </Dialog>
  );
}