import { useCallback, useEffect, useState } from "react";
import { Button, OverlayTrigger, Tooltip } from "react-bootstrap";
import { ToastContainer } from "react-toastify";
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import { faThumbsUp, faThumbsDown, faTrash, faPlus, faGear } from "@fortawesome/free-solid-svg-icons";
import Header from "../components/Header";
import Footer from "../components/Footer";
import Loader from "../components/Loader";
import { useAuth } from "../context/auth";
import Login from "../Login";
import AddSuggestionModal from "../components/modals/AddSuggestionModal";
import SuggestionDetailModal from "../components/modals/SuggestionDetailModal";
import {
  Suggestion,
  VoteDirection,
  listSuggestions,
  addSuggestion,
  voteSuggestion,
  deleteSuggestion,
} from "../../../types";
import "./SuggestionsPage.scss";

export default function SuggestionsPage() {
  const auth = useAuth();
  const [suggestions, setSuggestions] = useState<Suggestion[]>();
  const [addModalOpen, setAddModalOpen] = useState(false);
  const [detail, setDetail] = useState<Suggestion>();

  const reload = useCallback(async () => {
    if (!auth?.login) return;
    const response = await listSuggestions();
    setSuggestions(response.data ?? []);
  }, [auth?.login]);

  useEffect(() => {
    reload();
  }, [reload]);

  const handleAdd = async (title: string, description: string) => {
    const response = await addSuggestion({ body: { title, description } });
    if (response.data) {
      setSuggestions(response.data);
    }
  };

  const handleVote = async (id: string, direction: VoteDirection) => {
    const response = await voteSuggestion({ body: { id, direction } });
    if (response.data) {
      setSuggestions(response.data);
    }
  };

  const handleDelete = async (suggestion: Suggestion) => {
    if (!window.confirm(`Opravdu chcete smazat návrh „${suggestion.title}“? Smažou se i všechny jeho hlasy.`)) {
      return;
    }
    const response = await deleteSuggestion({ body: { id: suggestion.id } });
    if (response.data) {
      setSuggestions(response.data);
    }
  };

  // Vykreslí jeden řádek tabulky. Vyřešené návrhy jsou read-only (bez hlasování),
  // ale autor je stále může smazat.
  const renderRow = (suggestion: Suggestion) => (
    <OverlayTrigger
      key={suggestion.id}
      placement="top"
      overlay={<Tooltip id={`tooltip-${suggestion.id}`}>{suggestion.description}</Tooltip>}
    >
      <tr onClick={() => setDetail(suggestion)}>
        <td>{suggestion.author}</td>
        <td>{suggestion.title}</td>
        <td className="col-score">{suggestion.voteScore}</td>
        <td className="col-actions" onClick={e => e.stopPropagation()}>
          {!suggestion.resolved && (
            <>
              <button
                type="button"
                className={`vote-btn vote-up ${suggestion.myVote === VoteDirection.UP ? "active" : ""}`}
                title="Hlasovat pro"
                onClick={() => handleVote(suggestion.id, VoteDirection.UP)}
              >
                <FontAwesomeIcon icon={faThumbsUp} />
              </button>
              <button
                type="button"
                className={`vote-btn vote-down ${suggestion.myVote === VoteDirection.DOWN ? "active" : ""}`}
                title="Hlasovat proti"
                onClick={() => handleVote(suggestion.id, VoteDirection.DOWN)}
              >
                <FontAwesomeIcon icon={faThumbsDown} />
              </button>
            </>
          )}
          {suggestion.isMine && (
            <button
              type="button"
              className="vote-btn delete-btn"
              title="Smazat návrh"
              onClick={() => handleDelete(suggestion)}
            >
              <FontAwesomeIcon icon={faTrash} />
            </button>
          )}
        </td>
      </tr>
    </OverlayTrigger>
  );

  if (!auth?.login) {
    return <Login />;
  }

  if (!suggestions) {
    return <Loader icon={faGear} description={"Načítám návrhy..."} animation={"fa-bounce"} />;
  }

  const activeSuggestions = suggestions.filter(s => !s.resolved);
  const resolvedSuggestions = suggestions.filter(s => s.resolved);

  return (
    <>
      <Header />
      <div className="suggestions-page">
        <div className="suggestions-header">
          <h1>Návrhy na vylepšení</h1>
          <Button onClick={() => setAddModalOpen(true)}>
            <FontAwesomeIcon icon={faPlus} /> Přidat návrh
          </Button>
        </div>
        <p className="suggestions-info">
          Zde můžete navrhovat vylepšení aplikace a hlasovat o návrzích ostatních. U každého návrhu je
          zobrazeno jméno navrhovatele. Jména hlasujících jsou dostupná pouze administrátorům.
        </p>

        {suggestions.length === 0 ? (
          <p className="suggestions-empty">Zatím nebyly přidány žádné návrhy. Buďte první!</p>
        ) : (
          <>
            {activeSuggestions.length > 0 && (
              <table className="suggestions-table">
                <thead>
                  <tr>
                    <th>Navrhovatel</th>
                    <th>Název</th>
                    <th className="col-score">Hlasy</th>
                    <th className="col-actions">Akce</th>
                  </tr>
                </thead>
                <tbody>
                  {activeSuggestions.map(renderRow)}
                </tbody>
              </table>
            )}

            {resolvedSuggestions.length > 0 && (
              <div className="resolved-section">
                <h2>Vyřešené návrhy</h2>
                <p className="suggestions-info">
                  Tyto návrhy již byly zapracovány. Nelze pro ně hlasovat, autor je však může odstranit.
                </p>
                <table className="suggestions-table resolved">
                  <thead>
                    <tr>
                      <th>Navrhovatel</th>
                      <th>Název</th>
                      <th className="col-score">Hlasy</th>
                      <th className="col-actions">Akce</th>
                    </tr>
                  </thead>
                  <tbody>
                    {resolvedSuggestions.map(renderRow)}
                  </tbody>
                </table>
              </div>
            )}
          </>
        )}
      </div>
      <Footer />
      <AddSuggestionModal isOpen={addModalOpen} onClose={() => setAddModalOpen(false)} onSubmit={handleAdd} />
      <SuggestionDetailModal suggestion={detail} onClose={() => setDetail(undefined)} />
      <ToastContainer />
    </>
  );
}