import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query";
import { api } from "../lib/api";
import { useState } from "react";

export default function MessagesPage() {
  const [q, setQ] = useState("");
  const [dateFrom, setDateFrom] = useState("");
  const [dateTo, setDateTo] = useState("");
  const [unreadOnly, setUnreadOnly] = useState(false);
  const [expanded, setExpanded] = useState<number | null>(null);
  const [addingId, setAddingId] = useState<number | null>(null);
  const [addName, setAddName] = useState("");
  const [addEmail, setAddEmail] = useState("");
  const qc = useQueryClient();

  const { data, isLoading, error } = useQuery({
    queryKey: ["messages", q, dateFrom, dateTo, unreadOnly],
    queryFn: () => api.messages({ q, date_from: dateFrom, date_to: dateTo, unread: unreadOnly ? "1" : "" }),
  });

  const toggleRead = useMutation({
    mutationFn: (id: number) => api.toggleRead(id),
    onSuccess: () => qc.invalidateQueries({ queryKey: ["messages"] }),
  });
  const deleteMsg = useMutation({
    mutationFn: (id: number) => api.deleteMessage(id),
    onSuccess: () => qc.invalidateQueries({ queryKey: ["messages"] }),
  });
  const addContact = useMutation({
    mutationFn: (data: { name: string; number?: string; email?: string | null }) => api.createContact(data),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ["contacts"] });
      qc.invalidateQueries({ queryKey: ["messages"] });
      setAddingId(null);
      setAddName("");
      setAddEmail("");
    },
  });

  const onSubmit = (e: React.FormEvent) => e.preventDefault();

  const sanitiseNumber = (raw?: string) => {
    if (!raw) return "";
    const bracket = raw.match(/<([^>]+)>/);
    if (bracket) return bracket[1].trim();
    return raw.replace(/[^\d+]/g, "").trim();
  };

  const startAdd = (m: { id: number; contact_name?: string; callerid?: string }) => {
    setAddName(m.contact_name || "");
    setAddEmail("");
    setAddingId(m.id);
  };

  return (
    <>
      <form onSubmit={onSubmit} className="card" style={{ padding: "12px 16px" }}>
        <div className="row" style={{ alignItems: "center", gap: 8 }}>
          <input value={q} onChange={(e) => setQ(e.target.value)} placeholder="Search caller, transcript..." style={{ flex: 1, minWidth: 180 }} />
          <input type="date" value={dateFrom} onChange={(e) => setDateFrom(e.target.value)} style={{ width: "auto" }} />
          <input type="date" value={dateTo} onChange={(e) => setDateTo(e.target.value)} style={{ width: "auto" }} />
          <label style={{ fontWeight: 400, margin: 0, display: "flex", alignItems: "center", gap: 5 }}>
            <input type="checkbox" checked={unreadOnly} onChange={(e) => setUnreadOnly(e.target.checked)} /> unread
          </label>
          <button type="submit" className="primary">Filter</button>
          {(q || dateFrom || dateTo || unreadOnly) && <a className="btn" href="/">Clear all</a>}
        </div>
      </form>

      {isLoading && <div className="card empty">Loading...</div>}
      {error && <div className="card err">{(error as Error).message}</div>}

      {data?.messages?.map((m) => {
        const whoRaw = m.contact_name || m.callerid || "Unknown caller";
        const num = sanitiseNumber(m.callerid);
        const showAdd = !m.contact_name && num;
        return (
          <div key={m.id} className={"card" + (m.is_read ? "" : " unread")}>
            <div className="who">
              {m.contact_name && num ? (
                <a href={"/contacts/history/" + encodeURIComponent(num.replace(/^\+/, ""))}>{whoRaw}</a>
              ) : (
                <span>{whoRaw}</span>
              )}
            </div>
            <div className="meta">
              {m.time}{m.duration_fmt ? ` · ${m.duration_fmt}` : ""}
            </div>
            <div className="sum">{m.summary || "(no speech detected)"}</div>
            {m.transcript && (
              <details style={{ marginTop: 8 }}>
                <summary>Full transcript</summary>
                <div className="tr">{m.transcript}</div>
              </details>
            )}
            {m.tags?.length ? (
              <div style={{ marginTop: 8 }}>
                {m.tags.map((t: string) => <span key={t} className="tag">{t}</span>)}
              </div>
            ) : null}
            {m.numbers?.length ? (
              <div className="meta" style={{ marginTop: 6 }}>
                📞 Callback:{" "}
                {m.numbers.map((n: string) => {
                  const digits = n.replace(/[^\d+]/g, "");
                  return <a key={n} href={"tel:" + digits}>{n}</a>;
                }).reduce((prev: any, curr: any, i: number) => i === 0 ? [curr] : [...prev, " · ", curr], [])}
              </div>
            ) : null}
            {m.has_audio && <audio controls preload="none" src={"/audio/" + m.id} />}
            <div className="row">
              <button onClick={() => toggleRead.mutate(m.id)}>
                {m.is_read ? "Mark unread" : "Mark read"}
              </button>
              {m.has_audio && <a className="btn" href={"/audio/" + m.id + "?dl=1"}>Download</a>}
              <button className="danger" onClick={() => deleteMsg.mutate(m.id)}>Delete</button>
              {showAdd && (
                <button className="add-btn" onClick={() => startAdd(m)}>+ Add to contacts</button>
              )}
            </div>
          </div>
        );
      })}

      {data?.messages?.length === 0 && (
        <div className="card empty">No voicemails match your filters.</div>
      )}

      {addingId !== null && (
        <div className="modal-bg open" onClick={() => setAddingId(null)}>
          <div className="modal" onClick={(e) => e.stopPropagation()}>
            <h3>Add contact</h3>
            {(() => { const target = data?.messages?.find((x: any) => x.id === addingId); const num = sanitiseNumber(target?.callerid); return num ? <div style={{ marginBottom: 10, fontFamily: "var(--font-mono)", fontSize: 13, color: "var(--text-secondary)" }}>Number: {num}</div> : null; })()}
            <form onSubmit={(e) => { e.preventDefault(); if (!addName.trim()) return; const target = data?.messages?.find((x: any) => x.id === addingId); const targetNum = sanitiseNumber(target?.callerid); addContact.mutate({ name: addName.trim(), number: targetNum || undefined, email: addEmail.trim() || null }); }}>
              <label>Name</label>
              <input value={addName} onChange={(e) => setAddName(e.target.value)} required />
              <label>Email</label>
              <input type="email" value={addEmail} onChange={(e) => setAddEmail(e.target.value)} />
              <div className="row">
                <button type="button" className="btn" onClick={() => setAddingId(null)}>Cancel</button>
                <button type="submit" className="primary" disabled={addContact.isPending}>Save</button>
              </div>
            </form>
          </div>
        </div>
      )}
    </>
  );
}