// Websocket client + reactive session state (Svelte 5 runes).

import type { Command, GameEvent, GameView } from "@wizwar/engine";
import { cardDef } from "@wizwar/engine";

const SERVER_URL =
  import.meta.env.VITE_WIZWAR_SERVER ??
  (location.hostname === "localhost"
    ? "ws://localhost:8787"
    : `${location.protocol === "https:" ? "wss" : "ws"}://${location.host}/ws`);

export function humanize(e: GameEvent): string | null {
  switch (e.type) {
    case "gameStarted": return `Game started — ${e.players.join(", ")}. ${e.firstPlayer} goes first.`;
    case "turnStarted": return `— ${e.player}'s turn (round ${e.round}) —`;
    case "turnSkipped": return `${e.player} loses a turn.`;
    case "extraTurnStarted": return `${e.player} takes an extra turn!`;
    case "moved": return null; // too chatty for the log
    case "numberPlayedForMovement": return `${e.player} plays a ${e.value} for movement (${e.newAllowance} total).`;
    case "punched": return `${e.attacker} punches ${e.target}!`;
    case "spellCast": {
      const num = e.numberValue ? ` with a ${e.numberValue}` : "";
      const at = e.target ? ` at ${e.target}` : "";
      return `${e.caster} casts ${cardDef(e.cardId).name}${num}${at}.`;
    }
    case "counteractionPlayed": return `${e.player} counters with ${cardDef(e.cardId).name}!`;
    case "counterNullified": return `${cardDef(e.card.cardId).name} is nullified by Anti-Anti!`;
    case "attackAbsorbedIntoHand": return `${e.player} absorbs the spell into their hand!`;
    case "attackResolved":
      if (e.redirected) return `The spell is reflected back at ${e.attacker}!`;
      if (e.fullyStopped) return `The attack is completely stopped.`;
      return null; // the damaged event tells the story
    case "damaged": return `${e.player} takes ${e.amount} damage (${e.source}) — ${e.lifeAfter} life left.`;
    case "stunned": return `${e.player} is stunned and loses a turn!`;
    case "knockedBack": return `${e.player} is knocked back ${e.squares} square(s)!`;
    case "stonesDestroyed": return `${e.player}'s magic stones are destroyed!`;
    case "wallCreated": return `A wall appears!`;
    case "wallDestroyed": return e.wasDoor ? `A door is blasted to rubble!` : `A wall crumbles!`;
    case "extraTurnGranted": return `${e.player} speeds up — extra turn banked.`;
    case "trapSprung": return `${e.player} walked into an old TRAP! Lose a turn.`;
    case "attackMissed": return e.because === "invisible"
      ? `The attack passes through empty air — ${e.defender} is invisible!`
      : `${e.defender} is too small to hit — the attack misses!`;
    case "damageImmune": return `${e.player} is stone — the damage has no effect.`;
    case "lifeGained": return `${e.player} gains ${e.amount} life (${e.source}) — now ${e.lifeAfter}.`;
    case "spellSustained": return `${cardDef(e.cardId).name} settles over ${e.target} (${e.turns} turn${e.turns === 1 ? "" : "s"}).`;
    case "spellExpired": return `${cardDef(e.cardId).name} wears off ${e.target}.`;
    case "teleported": return e.by === e.player
      ? `${e.player} teleports across the maze!`
      : `${e.player} is teleported away by ${e.by}!`;
    case "positionsSwapped": return `${e.a} and ${e.b} swap places!`;
    case "cardErased": return e.found
      ? `${e.player}'s ${e.cardId ? cardDef(e.cardId).name : "card"} is erased from their mind!`
      : `${e.player} wasn't holding that card — the erasure fizzles.`;
    case "cardsStolen": return `${e.to} steals ${e.count} card(s) from ${e.from}'s thoughts!`;
    case "handRevealed": return `${e.to} reads ${e.player}'s mind — their hand is revealed.`;
    case "doorUnlocked": return `${e.player} unlocks a door.`;
    case "doorsRelocked": return `The door swings shut and relocks.`;
    case "doorJammed": return `${e.player} jams a door's lock solid.`;
    case "lockRemoved": return `${e.player} removes a door's lock for good.`;
    case "cardDisplayed": return `${e.player} displays ${cardDef(e.card.cardId).name}.`;
    case "lifeTraded": return `${e.player} burns ${e.points} life for speed!`;
    case "castAroundCorner": return `The spell bends around the corner!`;
    case "moveBumped": return `${e.player} blunders into a wall!`;
    case "attackMisdirected": return e.newTarget
      ? `${e.attacker}'s blind attack veers off — and hits ${e.newTarget}!`
      : `${e.attacker}'s blind attack flies off into the darkness.`;
    case "retreatedInHorror": return `${e.player} flees the hideous sight!`;
    case "illusionWallCreated": return `A wall appears... or does it?`;
    case "illusionTested": return e.result === "seesThrough"
      ? `${e.player} sees right through the illusion!`
      : `${e.player} is convinced the wall is real.`;
    case "sectorRotated": return `The maze GRINDS — a sector rotates ${e.clockwise ? "clockwise" : "counterclockwise"}!`;
    case "sectorRelocated": return `The maze SHUDDERS — an entire sector slides away!`;
    case "creatureCreated": return `${e.controller} summons a ${e.kind.replace(/-/g, " ")}!`;
    case "creatureMoved": return null;
    case "creatureAttacked": return e.dieRoll != null ? `The troll swings (rolled ${e.dieRoll})!` : `The creature strikes!`;
    case "creatureTouched": return `The creature falls upon ${e.player}!`;
    case "creatureDamaged": return e.amount > 0 ? `The ${e.creatureId} takes ${e.amount} damage.` : `The attack has no effect on it.`;
    case "creatureDestroyed": return `The ${e.kind.replace(/-/g, " ")} is destroyed (${e.by})!`;
    case "trollRegenerated": return `The troll's stony hide knits itself back together.`;
    case "shadowUpkeep": return `The shadow drains its master (${e.lifeAfter} life left).`;
    case "impScorches": return `The fire imp scorches ${e.player}!`;
    case "monsterBoosted": return `The monster GROWS — its ${e.boost} doubles!`;
    case "wandCharged": return `${e.player} charges a wand (${e.charges} charges).`;
    case "wandUsed": return e.chargesLeft > 0 ? `The wand crackles (${e.chargesLeft} left).` : null;
    case "wandExhausted": return `${e.player}'s wand crumbles to dust.`;
    case "wallWarpedOpen": return `A section of wall shimmers out of existence!`;
    case "wallsWarpedBack": return `The warped wall snaps back into place.`;
    case "shoved": return `${e.player} is shoved bodily by ${e.by}!`;
    case "webbed": return `${e.player} is tangled in sticky webs!`;
    case "cardRetrieved": return `${e.player} plucks a card from the discard pile.`;
    case "slippedInOoze": return `${e.player} slips flat on their face in the ooze!`;
    case "struggledInOoze": return e.stood ? `${e.player} staggers upright.` : `${e.player} flounders in the ooze.`;
    case "steppedOnTacks": return `${e.player} steps on tacks! OW OW OW.`;
    case "jumpedPit": return `${e.player} leaps the pit!`;
    case "fellInPit": return `${e.player} misjudges the jump and plummets in!`;
    case "climbedFromPit": return e.success ? `${e.player} hauls themselves out of the pit.` : `${e.player} scrabbles at the pit walls in vain.`;
    case "stuckInSlime": return `${e.player} squelches into the slime and sticks fast.`;
    case "boobytrapPlaced": return `${e.caster} places four suspicious tokens...`;
    case "boobytrapSprung": return `SNAP! ${e.player} finds the real boobytrap!`;
    case "objectsGlued": return `Everything on that square is glued down (${e.turns} turns).`;
    case "safeCreated": return `A massive safe slams down around the loot.`;
    case "safeOpened": return null;
    case "itemsTraded": return `Two items blink and trade places.`;
    case "stoneTurnedToWater": return `Stone runs like water — a wave crashes out!`;
    case "handsSwapped": return `${e.a} and ${e.b} trade entire hands of cards!`;
    case "handsScrambled": return `CHAOS! Every hand is thrown in a pile and redealt!`;
    case "rammed": return `BAAA! ${e.attacker} turns into a goat and rams ${e.target} (${e.distance} spaces)!`;
    case "treasureThrown": return `${e.attacker} HURLS their treasure (${e.distance} spaces)!`;
    case "illusionBelieved": return e.believed ? `${e.player} flinches — the illusion feels real!` : `${e.player} laughs off the illusion.`;
    case "itemStolen": return `${e.to} picks ${e.from}'s pocket.`;
    case "itemsSwapped": return `${e.a} and ${e.b} swap items.`;
    case "wardSprung": return `${e.owner}'s treasure was WARDED — it bites ${e.victim}!`;
    case "curseRemoved": return `${e.caster} lifts a curse from ${e.target}.`;
    case "objectEnchanted": return `An object gleams with Swarthmore's enchantment.`;
    case "warpTokensPlaced": return `Two dimensional warp tokens hum to life.`;
    case "warpStepped": return `${e.player} steps through the dimensional warp!`;
    case "exitsRedirected": return `The maze's outer exits twist and reconnect!`;
    case "outOfTurnWindow": return `${e.player} interrupts the flow of time (${e.kind === "interrupt" ? "Interrupt" : "Opportunity Fire"})!`;
    case "thumbOfGod": return `THE THUMB OF GOD descends! The die crashes down${e.aimedAt.x === e.landedAt.x && e.aimedAt.y === e.landedAt.y ? " dead on target" : " — and drifts"}!`;
    case "tokenScattered": return `${e.what} goes flying!`;
    case "ambushSet": return `You commit ${e.spell} to an ambush (${e.via}).`;
    case "ambushCancelled": return `You quietly disarm your ambush.`;
    case "ambushSprung": return `AMBUSH! ${e.owner}'s hidden ${e.via.replace(/-/g, " ")} springs on ${e.victim}!`;
    case "trapRedrawnDuringDeal": return null;
    case "died": return `☠ ${e.player} is dead${e.killedBy ? ` — killed by ${e.killedBy}` : ""}.`;
    case "handTaken": return `${e.to} takes ${e.count} cards from ${e.from}'s body.`;
    case "treasurePickedUp": return `${e.player} grabs ${e.owner}'s treasure!`;
    case "objectDropped": return `${e.player} sets down the ${cardDef(e.card.cardId).name}${e.forced ? " (forced)" : ""}.`;
    case "objectPickedUp": return `${e.player} picks up the ${cardDef(e.card.cardId).name} — actions over.`;
    case "wardSet": return e.armed ? "Your ward is set — the next thief bleeds." : "Your ward stands down.";
    case "chaosShielded": return `${e.player} raises a FULL SHIELD and sits out the chaos.`;
    case "wallDamaged": {
      const what = e.needed === 15 ? "door" : "wall";
      return `${e.player} batters the ${what} with ${e.source === "punch" ? "bare fists" : cardDef(e.source).name} — ${e.total}/${e.needed}.`;
    }
    case "treasureDropped": return e.onHomeOf ? `${e.player} drops a treasure on ${e.onHomeOf}'s home base!` : `${e.player} drops a treasure.`;
    case "playerEliminated": return e.reason === "treasuresLost" ? `${e.player} is eliminated — both treasures lost!` : null;
    case "cardsDiscarded": return `${e.player} discards ${e.cards.length} card(s).`;
    case "cardsDrawn": return e.count > 0 ? `${e.player} draws ${e.count} card(s).` : null;
    case "deckReshuffled": return `The discard pile is reshuffled (${e.size} cards).`;
    case "turnEnded": return null;
    case "gameWon": return `🏆 ${e.player} WINS ${e.reason === "treasures" ? "by treasure!" : "— last wizard standing!"}`;
    default: return null;
  }
}

const SEAT_KEY = "wizwar-seat";
const SEATS_KEY = "wizwar-seats";
const SEEN_KEY = "wizwar-seen";

function loadSeen(): Record<string, number> {
  try { return JSON.parse(localStorage.getItem(SEEN_KEY) ?? "{}"); }
  catch { return {}; }
}

export interface Seat { name: string; roomId: string; token: string }
export interface GameSummary {
  roomId: string;
  name: string;
  players: string[];
  started: boolean;
  finished: boolean;
  winner: string | null;
  activePlayerId: string | null;
  yourTurn: boolean;
  attention: "turn" | "counteract" | "discard" | "interrupt" | null;
  round: number | null;
  lastMoveAt: string | null;
}

export function attentionLabel(a: GameSummary["attention"]): string {
  switch (a) {
    case "counteract": return "UNDER ATTACK — respond!";
    case "discard": return "DISCARD to your hand limit";
    case "interrupt": return "your interruption is waiting";
    default: return "YOUR TURN";
  }
}

function loadSeats(): Seat[] {
  try { return JSON.parse(localStorage.getItem(SEATS_KEY) ?? "[]"); }
  catch { return []; }
}
function saveSeats(seats: Seat[]): void {
  localStorage.setItem(SEATS_KEY, JSON.stringify(seats));
}

class Net {
  status = $state<"disconnected" | "connected">("disconnected");
  roomId = $state<string | null>(null);
  players = $state<string[]>([]);
  hostId = $state<string | null>(null);
  started = $state(false);
  /** Lobby standee choices, by player name. */
  roomColors = $state<Record<string, number>>({});
  you = $state<string | null>(null);
  view = $state<GameView | null>(null);
  log = $state<string[]>([]);
  error = $state<string | null>(null);
  /** Every seat this browser holds, across rooms. */
  seats = $state<Seat[]>(loadSeats());
  /** Lobby ledger: one summary per live seat. */
  stats = $state<Record<string, number | string | null> | null>(null);
  games = $state<GameSummary[]>([]);
  notificationsEnabled = $state(
    typeof Notification !== "undefined" && Notification.permission === "granted",
  );
  /** A transfer phrase we minted, to show the user. */
  transferCode = $state<{ code: string; expiresAt: number } | null>(null);
  /** Moves you haven't watched yet in the current room. */
  missedMoves = $state(0);
  /** A catch-up reel delivered by the server. */
  catchUp = $state<{ seq: number; actor: string; events: GameEvent[]; view: GameView }[] | null>(null);
  private seen: Record<string, number> = loadSeen();
  private currentSeq = 0;
  private lastYourTurn = new Map<string, boolean>();
  private pollTimer: ReturnType<typeof setInterval> | null = null;

  private ws: WebSocket | null = null;
  private token: string | null = null;
  private roomIdPending: string | null = null;

  connect(): void {
    if (this.ws) return;
    const ws = new WebSocket(SERVER_URL);
    this.ws = ws;
    ws.onopen = () => {
      this.status = "connected";
      // Mid-game reconnects (the socket dropped, not the page) walk straight
      // back to the table; otherwise the lobby ledger is the front door.
      const saved = localStorage.getItem(SEAT_KEY);
      if (saved && this.roomId) {
        try {
          const seat = JSON.parse(saved) as { name: string; roomId: string; token: string };
          if (seat.roomId === this.roomId) {
            this.send({ type: "join", roomId: seat.roomId, name: seat.name, token: seat.token });
          }
        } catch { localStorage.removeItem(SEAT_KEY); }
      }
      this.refreshGames();
    };
    ws.onclose = () => {
      this.status = "disconnected";
      this.ws = null;
      setTimeout(() => this.connect(), 1500);
    };
    ws.onmessage = (raw) => {
      const msg = JSON.parse(raw.data as string);
      switch (msg.type) {
        case "seat": {
          this.token = msg.token;
          const seatRoom = (this.roomIdPending ?? this.roomId ?? "").toUpperCase();
          if (seatRoom) {
            const seat: Seat = { name: msg.playerId, roomId: seatRoom, token: msg.token };
            localStorage.setItem(SEAT_KEY, JSON.stringify(seat));
            this.rememberSeat(seat);
          }
          break;
        }
        case "room":
          this.roomId = msg.roomId;
          this.roomColors = msg.colors ?? {};
          if (this.you && this.token) {
            const seat: Seat = { name: this.you, roomId: msg.roomId, token: this.token };
            localStorage.setItem(SEAT_KEY, JSON.stringify(seat));
            this.rememberSeat(seat);
          }
          this.players = msg.players;
          this.hostId = msg.hostId;
          this.started = msg.started;
          break;
        case "state": {
          this.view = msg.view;
          if (typeof msg.seq === "number" && this.roomId) {
            this.currentSeq = msg.seq;
            const last = this.seen[this.roomId] ?? 0;
            this.missedMoves = Math.max(0, msg.seq - last);
            // Watching live counts as seeing; only a fresh arrival has a gap.
            if (this.missedMoves === 0 || document.visibilityState === "visible") {
              // A live update while present marks itself seen.
              if (last >= msg.seq - 1) this.markSeen();
            }
          }
          break;
        }
        case "catchUp":
          this.catchUp = msg.steps;
          break;
        case "events":
          for (const e of msg.events as GameEvent[]) {
            const line = humanize(e);
            if (line) this.log = [...this.log, line];
          }
          break;
        case "transferCode":
          this.transferCode = { code: msg.code, expiresAt: msg.expiresAt };
          break;
        case "transferClaimed": {
          const seat = msg.seat as Seat & { roomId: string };
          this.rememberSeat({ name: seat.name, roomId: seat.roomId, token: seat.token });
          this.refreshGames();
          this.resume({ name: seat.name, roomId: seat.roomId, token: seat.token });
          break;
        }
        case "stats": {
          this.stats = msg.stats;
          break;
        }
        case "games": {
          this.games = msg.games;
          for (const g of msg.games as GameSummary[]) {
            const key = `${g.roomId}:${g.name}`;
            const was = this.lastYourTurn.get(key) ?? false;
            if (g.yourTurn && !was) this.notifyTurn(g);
            this.lastYourTurn.set(key, g.yourTurn);
          }
          break;
        }
        case "error":
          if (this.roomIdPending && /no such room|name is taken/.test(msg.message)) {
            localStorage.removeItem(SEAT_KEY);
            this.roomIdPending = null;
          }
          this.error = msg.message;
          setTimeout(() => { if (this.error === msg.message) this.error = null; }, 5000);
          break;
      }
    };
  }

  private send(message: unknown): void {
    if (this.ws?.readyState === WebSocket.OPEN) this.ws.send(JSON.stringify(message));
  }

  create(name: string): void {
    this.you = name;
    this.send({ type: "create", name });
  }

  join(roomId: string, name: string): void {
    this.you = name;
    this.roomIdPending = roomId.toUpperCase();
    const existing = this.seats.find(
      (s) => s.roomId === this.roomIdPending && s.name === name,
    );
    this.send({ type: "join", roomId, name, token: existing?.token ?? this.token });
  }

  /** Sit back down at a remembered seat. */
  resume(seat: Seat): void {
    this.you = seat.name;
    this.token = seat.token;
    this.roomIdPending = seat.roomId;
    this.log = [];
    this.send({ type: "join", roomId: seat.roomId, name: seat.name, token: seat.token });
  }

  private rememberSeat(seat: Seat): void {
    const rest = this.seats.filter((s) => !(s.roomId === seat.roomId && s.name === seat.name));
    this.seats = [seat, ...rest];
    saveSeats(this.seats);
  }

  /** Drop a finished (or abandoned) game from the ledger. */
  forgetSeat(roomId: string): void {
    this.seats = this.seats.filter((s) => s.roomId !== roomId);
    saveSeats(this.seats);
    this.games = this.games.filter((g) => g.roomId !== roomId);
  }

  requestTransferCode(): void {
    this.send({ type: "makeTransfer" });
  }
  claimTransfer(code: string): void {
    this.send({ type: "claimTransfer", code });
  }

  /** Ask the server how all our games are doing. */
  requestStats(): void {
    this.send({ type: "stats" });
  }

  /** Anonymous count-only ping so hotseat tables show in the tally. */
  reportHotseat(report: {
    id: string; stage: "started" | "finished";
    players?: number; commands?: number; minutes?: number; winReason?: string;
  }): void {
    this.send({ type: "hotseatReport", ...report });
  }

  refreshGames(): void {
    if (this.seats.length > 0) this.send({ type: "myGames", seats: $state.snapshot(this.seats) });
  }

  startGamePolling(): void {
    if (this.pollTimer) return;
    this.refreshGames();
    this.pollTimer = setInterval(() => this.refreshGames(), 45_000);
  }
  stopGamePolling(): void {
    if (this.pollTimer) { clearInterval(this.pollTimer); this.pollTimer = null; }
  }

  async enableNotifications(): Promise<void> {
    if (typeof Notification === "undefined") return;
    const perm = await Notification.requestPermission();
    this.notificationsEnabled = perm === "granted";
  }

  private notifyTurn(g: GameSummary): void {
    if (!this.notificationsEnabled || typeof Notification === "undefined") return;
    if (this.roomId === g.roomId && !document.hidden) return; // already looking at it
    try {
      new Notification(
        g.attention === "counteract"
          ? `Wiz-War — you are under attack in ${g.roomId}!`
          : `Wiz-War — your turn in ${g.roomId}`,
        {
          body: `${g.players.join(" vs ")} · round ${g.round ?? "?"}`,
          tag: `wizwar-${g.roomId}`,
        },
      );
    } catch { /* blocked at the OS level; the tab title still shows it */ }
  }

  /** Forget the remembered seat and return to the lobby. */
  leave(): void {
    localStorage.removeItem(SEAT_KEY);
    this.roomId = null;
    this.roomIdPending = null;
    this.view = null;
    this.started = false;
    this.players = [];
    this.log = [];
    this.token = null;
  }

  start(expansion: boolean): void {
    this.send({ type: "start", expansion });
  }

  pickColor(color: number): void {
    this.send({ type: "pickColor", color });
  }

  /** Ask for the reel of everything since we last watched. */
  requestCatchUp(): void {
    if (!this.roomId) return;
    this.send({ type: "catchUp", sinceSeq: this.seen[this.roomId] ?? 0 });
  }

  /** All caught up: remember it and clear the banner. */
  markSeen(): void {
    if (!this.roomId) return;
    this.seen[this.roomId] = this.currentSeq;
    localStorage.setItem(SEEN_KEY, JSON.stringify(this.seen));
    this.missedMoves = 0;
  }

  closeCatchUp(): void {
    this.catchUp = null;
    this.markSeen();
  }

  command(command: Command): void {
    this.send({ type: "command", command });
  }
}

export const net = new Net();