"use client";

import { useCallback, useEffect, useRef, useState } from "react";
import {
  fetchPokerTable,
  joinPokerTable,
  leavePokerTable,
  startPokerGame,
  type PokerSnapshot,
} from "@/app/(frontend)/minigames/poker/actions";
import type { PokerPhase } from "@/lib/minigames/poker";
import { useRealtimePresence } from "@/hooks/useRealtimePresence";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { PokerGuide } from "./PokerGuide";
import {
  POKER_STATE_EVENT,
  POKER_TABLES_EVENT,
  POKER_TERMINATED_EVENT,
  readPokerStateEvent,
  readPokerTerminatedEvent,
} from "./events";
import { PokerLeaderboard } from "./PokerLeaderboard";
import { PokerLobby } from "./PokerLobby";
import { PokerTable } from "./PokerTable";
import type { PokerStats } from "./types";

interface PokerArenaProps {
  readonly initialStats: PokerStats;
  readonly currentUserId: number | string;
  readonly initialTableId?: string;
  readonly isSuperuser: boolean;
}

type ArenaView = "lobby" | "table";

const STAT_ITEMS = [
  ["Games", "gamesPlayed"],
  ["Wins", "wins"],
  ["Hands won", "handsWon"],
  ["Best chips", "bestScore"],
  ["XP earned", "xpEarned"],
] as const satisfies readonly (readonly [string, keyof PokerStats])[];

export function PokerArena({
  initialStats,
  currentUserId,
  initialTableId,
  isSuperuser,
}: PokerArenaProps) {
  const [view, setView] = useState<ArenaView>(initialTableId ? "table" : "lobby");
  const [snapshot, setSnapshot] = useState<PokerSnapshot | null>(null);
  const [activeTableId, setActiveTableId] = useState<string | null>(initialTableId ?? null);
  const [tableError, setTableError] = useState<string | null>(null);
  const [loading, setLoading] = useState(Boolean(initialTableId));
  const [terminated, setTerminated] = useState<string | null>(null);
  const [leaderboardRefreshKey, setLeaderboardRefreshKey] = useState(0);
  const [lobbyRefreshKey, setLobbyRefreshKey] = useState(0);
  const lastPhaseRef = useRef<PokerPhase | null>(null);
  const syncedTableIdRef = useRef<string | null>(null);

  const applySnapshot = useCallback((next: PokerSnapshot) => {
    setSnapshot((current) => {
      if (current && next.version <= current.version) return current;
      return next;
    });
    setActiveTableId(next.tableId);
    setTerminated((current) => (current !== next.tableId ? null : current));
    if (syncedTableIdRef.current !== next.tableId) {
      syncedTableIdRef.current = next.tableId;
      window.history.replaceState(
        null,
        "",
        `/minigames/poker?table=${encodeURIComponent(next.tableId)}`,
      );
    }
    setView("table");
    setTableError(null);
    setLoading(false);

    const nextPhase = next.you?.phase ?? null;
    if (nextPhase === "game-complete" && lastPhaseRef.current !== "game-complete") {
      setLeaderboardRefreshKey((key) => key + 1);
    }
    lastPhaseRef.current = nextPhase;
  }, []);

  useEffect(() => {
    if (!initialTableId) {
      setLoading(false);
      return;
    }

    let cancelled = false;
    setLoading(true);
    void fetchPokerTable(initialTableId)
      .then((result) => {
        if (cancelled) return;
        if (result.success && result.data) {
          applySnapshot(result.data);
        } else {
          setTableError(result.error ?? "This poker table was not found.");
          setLoading(false);
        }
      })
      .catch((caught: unknown) => {
        if (cancelled) return;
        setTableError(
          caught instanceof Error ? caught.message : "This poker table could not be loaded.",
        );
        setLoading(false);
      });

    return () => {
      cancelled = true;
    };
  }, [applySnapshot, initialTableId]);

  useEffect(() => {
    const handleState = (event: Event) => {
      const detail = readPokerStateEvent(event);
      if (!detail || detail.tableId !== activeTableId) return;
      applySnapshot(detail.snapshot);
    };
    const handleTables = () => setLobbyRefreshKey((key) => key + 1);
    const handleTerminated = (event: Event) => {
      const detail = readPokerTerminatedEvent(event);
      if (!detail || detail.tableId !== activeTableId) return;
      setTerminated(detail.tableId);
    };
    window.addEventListener(POKER_STATE_EVENT, handleState);
    window.addEventListener(POKER_TABLES_EVENT, handleTables);
    window.addEventListener(POKER_TERMINATED_EVENT, handleTerminated);
    return () => {
      window.removeEventListener(POKER_STATE_EVENT, handleState);
      window.removeEventListener(POKER_TABLES_EVENT, handleTables);
      window.removeEventListener(POKER_TERMINATED_EVENT, handleTerminated);
    };
  }, [activeTableId, applySnapshot]);

  // Polls are the correctness path: the in-memory SSE bus cannot reliably
  // deliver server-action pushes (dev per-bundle module duplication). The
  // SSE push stays as an instant bonus; applySnapshot dedupes by version.
  useEffect(() => {
    if (view !== "table" || activeTableId === null || terminated === activeTableId) return;
    let cancelled = false;
    const poll = window.setInterval(() => {
      void fetchPokerTable(activeTableId)
        .then((result) => {
          if (cancelled) return;
          if (result.success && result.data) applySnapshot(result.data);
        })
        .catch(() => undefined);
    }, 1250);
    return () => {
      cancelled = true;
      window.clearInterval(poll);
    };
  }, [activeTableId, terminated, view, applySnapshot]);

  const resetToLobby = useCallback(() => {
    setView("lobby");
    setSnapshot(null);
    setActiveTableId(null);
    setTableError(null);
    setLoading(false);
    setTerminated(null);
    lastPhaseRef.current = null;
    if (syncedTableIdRef.current !== null) {
      syncedTableIdRef.current = null;
      window.history.replaceState(null, "", "/minigames/poker");
    }
  }, []);

  const leaveTable = useCallback(async () => {
    const seated = snapshot?.seats.some((id) => String(id) === String(currentUserId)) ?? false;
    if (activeTableId && seated) {
      try {
        const result = await leavePokerTable(activeTableId);
        if (!result.success) {
          setTableError(result.error ?? "Could not leave the poker table.");
          return;
        }
      } catch (caught) {
        setTableError(
          caught instanceof Error ? caught.message : "Could not leave the poker table.",
        );
        return;
      }
    }
    resetToLobby();
  }, [activeTableId, currentUserId, resetToLobby, snapshot]);

  const joinCurrentTable = useCallback(async () => {
    if (!activeTableId) return;
    setLoading(true);
    setTableError(null);
    try {
      const result = await joinPokerTable(activeTableId);
      if (result.success && result.data) {
        applySnapshot(result.data);
      } else {
        setTableError(result.error ?? "Could not join the poker table.");
        setLoading(false);
      }
    } catch (caught) {
      setTableError(caught instanceof Error ? caught.message : "Could not join the poker table.");
      setLoading(false);
    }
  }, [activeTableId, applySnapshot]);

  const startCurrentTable = useCallback(async () => {
    if (!activeTableId) return;
    try {
      const result = await startPokerGame(activeTableId);
      if (result.success && result.data) {
        applySnapshot(result.data);
      } else {
        setTableError(result.error ?? "Could not start the poker game.");
      }
    } catch (caught) {
      setTableError(caught instanceof Error ? caught.message : "Could not start the poker game.");
    }
  }, [activeTableId, applySnapshot]);

  const activePlayers = useRealtimePresence(
    "poker",
    view === "table" && activeTableId !== null,
    true,
  );

  return (
    <div className="flex flex-col gap-6">
      <Card className="rounded-none">
        <CardHeader className="border-b p-4">
          <div className="flex flex-wrap items-center justify-between gap-3">
            <div>
              <CardTitle className="text-sm">Your poker record</CardTitle>
              <p className="text-sm text-muted-foreground">
                Results are recorded when a sit-and-go ends.
              </p>
            </div>
            <PokerGuide />
          </div>
        </CardHeader>
        <CardContent className="grid grid-cols-2 gap-3 p-4 sm:grid-cols-5">
          {STAT_ITEMS.map(([label, key]) => (
            <div key={key} className="flex flex-col gap-1 border border-border p-3">
              <span className="text-xs uppercase tracking-wider text-muted-foreground">
                {label}
              </span>
              <span className="font-mono text-lg font-semibold tabular-nums">
                {initialStats[key].toLocaleString()}
              </span>
            </div>
          ))}
        </CardContent>
      </Card>

      {tableError && snapshot && (
        <p className="text-sm text-destructive" role="alert">
          {tableError}
        </p>
      )}

      <div className="grid min-w-0 gap-6 xl:grid-cols-[minmax(0,1fr)_minmax(22rem,28rem)]">
        <section className="min-w-0">
          {view === "lobby" ? (
            <PokerLobby
              refreshKey={lobbyRefreshKey}
              onOpenTable={applySnapshot}
              isSuperuser={isSuperuser}
            />
          ) : terminated === activeTableId ? (
            <Card className="rounded-none border-destructive/40" role="alert">
              <CardHeader className="border-b border-destructive/20 p-4">
                <CardTitle className="text-base text-destructive">
                  Game ended by an administrator
                </CardTitle>
              </CardHeader>
              <CardContent className="flex flex-col items-start gap-4 p-4">
                <p className="text-sm text-muted-foreground">
                  An administrator forcefully ended this poker table.
                </p>
                <Button type="button" variant="outline" onClick={resetToLobby}>
                  Back to lobby
                </Button>
              </CardContent>
            </Card>
          ) : (
            <PokerTable
              snapshot={snapshot}
              currentUserId={currentUserId}
              loading={loading}
              tableError={tableError}
              onSnapshot={applySnapshot}
              onJoin={joinCurrentTable}
              onStart={startCurrentTable}
              onLeave={leaveTable}
              onBack={resetToLobby}
            />
          )}
        </section>
        <PokerLeaderboard
          refreshKey={leaderboardRefreshKey}
          currentUserId={currentUserId}
          activePlayers={activePlayers}
        />
      </div>
    </div>
  );
}