import { useState } from "react";
import { t } from "@lingui/core/macro";
import { Trans } from "@lingui/react/macro";
import { Link, useParams } from "react-router";

import { useAuth } from "../hooks/useAuth.ts";
import { useWS } from "../hooks/useWS.ts";
import { useDumpListSync } from "../hooks/useDumpListSync.ts";
import { usePositionAwareSync } from "../hooks/usePositionAwareSync.ts";
import { useUserDumpFeed } from "../hooks/useUserDumpFeed.ts";
import { DumpCard } from "../components/DumpCard.tsx";
import { DumpCreateModal } from "../components/DumpCreateModal.tsx";
import { ProfileSubpageHeader } from "../components/ProfileSubpageHeader.tsx";
import { PageShell } from "../components/PageShell.tsx";
import { PageError } from "../components/PageError.tsx";

export function UserDumps() {
  const { username } = useParams();
  const { user: me } = useAuth();
  const { voteCounts, myVotes, lastDumpEvent, castVote, removeVote } = useWS();

  const { state, setItems, sentinelRef } = useUserDumpFeed(
    username,
    "dumps",
    `feed:user-dumps-full:${username ?? ""}`,
  );

  const [createModalOpen, setCreateModalOpen] = useState(false);

  const profileUserId = state.status === "loaded" ? state.profileUser.id : null;
  const isOwnProfile = me?.id === profileUserId;

  const dumpItems = state.status === "loaded" ? state.items : [];
  usePositionAwareSync(
    dumpItems,
    setItems,
    lastDumpEvent,
    (d) => d.isPrivate,
    (d) => !d.isPrivate && d.userId === profileUserId,
  );
  useDumpListSync(setItems, {
    ownerId: profileUserId ?? undefined,
    isOwner: isOwnProfile,
    skipReinsert: true,
  });

  if (state.status === "loading") {
    return (
      <PageShell>
        <p className="page-loading">
          <Trans>Loading…</Trans>
        </p>
      </PageShell>
    );
  }

  if (state.status === "error") {
    return (
      <PageError
        message={state.error}
        actions={
          <Link to={`/users/${username}`} className="btn-border">
            <Trans>← Back to profile</Trans>
          </Link>
        }
      />
    );
  }

  const { profileUser, items: dumps, hasMore, loadingMore } = state;

  return (
    <PageShell
      feed={dumps.length > 0 && (
        <>
          <ul className="dump-feed">
            {dumps.map((dump) => (
              <DumpCard
                key={dump.id}
                dump={dump}
                voteCount={voteCounts[dump.id] ?? dump.voteCount}
                voted={myVotes.has(dump.id)}
                canVote={!!me}
                castVote={castVote}
                removeVote={removeVote}
                isOwner={isOwnProfile}
              />
            ))}
          </ul>
          {hasMore && <div ref={sentinelRef} />}
          {loadingMore && (
            <p className="feed-loading-more">
              <Trans>Loading more…</Trans>
            </p>
          )}
          {!hasMore && (
            <p className="feed-end">
              <Trans>You've reached the end.</Trans>
            </p>
          )}
        </>
      )}
    >
      <ProfileSubpageHeader
        username={username!}
        profileUser={profileUser}
        title={t`Dumps`}
        actions={isOwnProfile && (
          <button
            type="button"
            className="new-item-toggle"
            onClick={() => setCreateModalOpen(true)}
          >
            +<span className="btn-new-label">
              <Trans>New dump</Trans>
            </span>
          </button>
        )}
      />
      {createModalOpen && (
        <DumpCreateModal onClose={() => setCreateModalOpen(false)} />
      )}
      {dumps.length === 0 && (
        <p className="empty-state">
          <Trans>Nothing here yet.</Trans>
        </p>
      )}
    </PageShell>
  );
}