import { useEffect, useRef, useState, type CSSProperties } from "react";
import { classById, isRomClassId, raceById } from "../app/characterCatalog";
import { useShellStore } from "../app/shellStore";
import { useCombatStore } from "../game/combatStore";
import {
  PARTY_ROLE_LABELS,
  usePartyStore,
  type PartyCommand,
  type PartyMember,
} from "../game/partyStore";
import { TimedEffectStrip } from "./TimedEffectStrip";
import { AuraStrip } from "./AuraStrip";
import { PLAYER_AGGRO_ID } from "../game/aggro";
import { useOnlineGroupStore } from "../app/onlineGroupStore";
import type { OnlineGroupMember } from "../app/onlineGroupTypes";
import { useOnlineSessionStore } from "../app/onlineSessionStore";
import type { OnlineSessionPlayer } from "../app/onlineSessionTypes";
import { onlinePlayerActorId, onlineSessionOwnsWorldSimulation } from "../game/onlineSessionRuntime";
import { auraDefinitionIsDispellableDebuff } from "./auraDisplay";
import { partyResurrectionBlockedByBoss, resurrectDeadPartyMembers } from "../game/partyResurrection";
import { ResurrectionDestination, useResurrectionCheckpoints } from "./ResurrectionDestination";
import { useGameStore } from "../game/store";
import { useHudSurface } from "./HudSurface";
import {
  PARTY_HEAL_POPUP_LIFETIME_MS,
  addedPartyHealPopups,
  appendPartyHealPopups,
  type PartyHealPopup,
} from "./partyHealPopups";

const PARTY_COMMANDS: readonly {
  command: PartyCommand;
  label: string;
  keybind: string;
  description: string;
}[] = [
  {
    command: "attack",
    label: "Attack",
    keybind: "F1",
    description: "Advance toward the next boss and defeat every enemy along the route.",
  },
  {
    command: "defend",
    label: "Defend",
    keybind: "F2",
    description: "Stay with you and fight only enemies that engage the group.",
  },
  {
    command: "stop",
    label: "Stop",
    keybind: "F3",
    description: "Hold the party at its current position until another order is given.",
  },
] as const;

export function PartyCommandBar({
  selectedControlId,
  onControlSelect,
  className = "",
}: {
  selectedControlId?: string;
  onControlSelect?: (id: string) => void;
  className?: string;
}) {
  const activeCommand = usePartyStore((state) => state.command);
  const setCommand = usePartyStore((state) => state.setCommand);
  const recallParty = usePartyStore((state) => state.recallParty);

  return (
    <div className={`party-command-bar ${className}`.trim()} role="group" aria-label="Party orders">
      {PARTY_COMMANDS.map(({ command, label, keybind, description }) => {
        const controlId = `party-command-${command}`;
        return (
          <button
            key={command}
            type="button"
            className={`${activeCommand === command ? "is-active" : ""} ${selectedControlId === controlId ? "is-controller-selected" : ""}`.trim()}
            aria-pressed={activeCommand === command}
            aria-label={`${label} party order. ${description}`}
            title={description}
            onPointerEnter={() => onControlSelect?.(controlId)}
            onFocus={() => onControlSelect?.(controlId)}
            onClick={() => {
              onControlSelect?.(controlId);
              setCommand(command);
            }}
          >
            <strong>{label}</strong>
            <kbd>{keybind}</kbd>
          </button>
        );
      })}
      <button
        type="button"
        className={selectedControlId === "party-command-recall" ? "is-controller-selected" : ""}
        aria-label="Recall party. Teleport every companion to your position without changing the current party order."
        title="Teleport every companion to you without changing the current order."
        onPointerEnter={() => onControlSelect?.("party-command-recall")}
        onFocus={() => onControlSelect?.("party-command-recall")}
        onClick={() => {
          onControlSelect?.("party-command-recall");
          recallParty();
        }}
      >
        <strong>Recall</strong>
        <kbd>F4</kbd>
      </button>
    </div>
  );
}

function healthPercent(current: number, maximum: number): number {
  if (maximum <= 0) return 0;
  return Math.max(0, Math.min(100, current / maximum * 100));
}

function HealPopups({ popups, targetId }: {
  popups: readonly PartyHealPopup[];
  targetId: string;
}) {
  const targetPopups = popups.filter((popup) => popup.targetActorId === targetId);
  if (targetPopups.length === 0) return null;
  return (
    <span className="party-frame__heal-popups" aria-hidden="true">
      {targetPopups.map((popup) => (
        <span
          key={popup.key}
          className={`party-frame__heal-popup ${popup.critical ? "is-critical" : ""}`}
          style={{ "--party-heal-x": `${popup.horizontalOffset}px` } as CSSProperties}
        >+{popup.amount}</span>
      ))}
    </span>
  );
}

function usePartyHealPopups(enabled: boolean): readonly PartyHealPopup[] {
  const [popups, setPopups] = useState<PartyHealPopup[]>([]);
  const timers = useRef(new Map<string, number>());

  useEffect(() => {
    const clearPopups = () => {
      for (const timer of timers.current.values()) window.clearTimeout(timer);
      timers.current.clear();
      setPopups([]);
    };
    if (!enabled) {
      clearPopups();
      return undefined;
    }
    const unsubscribe = useCombatStore.subscribe((state, previous) => {
      const inCombat = Object.values(state.mobs).some((mob) => (
        mob.engaged && !mob.dead && !mob.despawned
      ));
      const wasInCombat = Object.values(previous.mobs).some((mob) => (
        mob.engaged && !mob.dead && !mob.despawned
      ));
      if (!inCombat) {
        if (wasInCombat) clearPopups();
        return;
      }
      const visibleTargetIds = new Set([
        PLAYER_AGGRO_ID,
        ...usePartyStore.getState().members.map((member) => member.id),
        ...(useOnlineSessionStore.getState().snapshot?.players ?? []).map((player) => (
          onlinePlayerActorId(player.accountId)
        )),
      ]);
      const added = addedPartyHealPopups(previous.combatEvents, state.combatEvents, true)
        .filter((popup) => visibleTargetIds.has(popup.targetActorId));
      if (added.length === 0) return;
      setPopups((current) => appendPartyHealPopups(current, added));
      for (const popup of added) {
        const existing = timers.current.get(popup.key);
        if (existing !== undefined) window.clearTimeout(existing);
        timers.current.set(popup.key, window.setTimeout(() => {
          timers.current.delete(popup.key);
          setPopups((current) => current.filter((candidate) => candidate.key !== popup.key));
        }, PARTY_HEAL_POPUP_LIFETIME_MS));
      }
    });
    return () => {
      unsubscribe();
      for (const timer of timers.current.values()) window.clearTimeout(timer);
      timers.current.clear();
    };
  }, [enabled]);

  return popups;
}

function MemberFrame({ member, selected, onSelect, healPopups }: {
  member: PartyMember;
  selected: boolean;
  onSelect: () => void;
  healPopups: readonly PartyHealPopup[];
}) {
  const characterClass = classById(member.classId);
  const race = raceById(member.raceId);
  const isRom = isRomClassId(member.classId);
  const classLabel = `${characterClass.name}${member.secondaryClassId ? `/${classById(member.secondaryClassId).name}` : ""}`;
  const percent = healthPercent(member.health, member.maxHealth);
  const absorb = useCombatStore((state) => state.auras.reduce((total, aura) => (
    aura.targetId === member.id
      ? total + aura.absorbs.reduce((sum, pool) => sum + pool.remaining, 0)
      : total
  ), 0));
  const absorbPercent = Math.min(100 - percent, healthPercent(absorb, member.maxHealth));
  const dispellableCount = useCombatStore((state) => state.auras.reduce((total, aura) => (
    aura.targetId === member.id && auraDefinitionIsDispellableDebuff(aura.definition)
      ? total + 1
      : total
  ), 0));
  const dispellableNames = useCombatStore((state) => state.auras
    .filter((aura) => aura.targetId === member.id && auraDefinitionIsDispellableDebuff(aura.definition))
    .map((aura) => aura.definition.name)
    .join(", "));
  const resourcePercent = healthPercent(member.resource, member.maxResource);
  return (
    <button
      type="button"
      className={`party-frame ${selected ? "is-selected" : ""} ${dispellableCount ? "is-dispellable" : ""} ${member.health <= 0 ? "is-down" : ""}`}
      onClick={onSelect}
      aria-pressed={selected}
      aria-label={isRom ? `Target ${member.name}, ${classLabel}` : `Target ${member.name}, ${member.gender} ${race.name}, ${member.specialization} ${characterClass.name}`}
    >
      <span className="party-frame__sigil" style={{ "--party-class-color": characterClass.color } as CSSProperties}>{characterClass.sigil}</span>
      <span className="party-frame__body">
        <span className="party-frame__identity"><strong>{member.name}</strong><small style={isRom ? { textTransform: "none" } : undefined}>{isRom ? classLabel : `${PARTY_ROLE_LABELS[member.role]} · ${race.name} · ${member.specialization}`}</small></span>
        {dispellableCount ? <span className="party-frame__dispel" title={dispellableNames}>DISPEL {dispellableCount}</span> : null}
        <span className="party-frame__health" role="progressbar" aria-label={`${member.name} health`} aria-valuemin={0} aria-valuemax={member.maxHealth} aria-valuenow={Math.max(0, member.health)}>
          <i style={{ width: `${percent}%` }} />
          {absorb > 0 ? <em style={{ left: `${percent}%`, width: `${absorbPercent}%` }} /> : null}
          <b>{Math.ceil(member.health)} / {member.maxHealth}</b>
        </span>
        <span className={`party-frame__resource party-frame__resource--${member.resourceType}`} title={`${Math.floor(member.resource)} / ${member.maxResource} ${member.resourceName}`}>
          <i style={{ width: `${resourcePercent}%` }} />
        </span>
        <TimedEffectStrip targetId={member.id} className="timed-effect-strip--party" />
        <AuraStrip
          targetId={member.id}
          className="aura-strip--party"
          hideLongTerm
          highlightDispellableDebuffs
        />
      </span>
      <HealPopups popups={healPopups} targetId={member.id} />
    </button>
  );
}

function OnlineMemberFrame({
  member,
  player,
  selected,
  onSelect,
  healPopups,
}: {
  member: OnlineGroupMember;
  player: OnlineSessionPlayer | null;
  selected: boolean;
  onSelect: () => void;
  healPopups: readonly PartyHealPopup[];
}) {
  const character = member.character;
  if (!character) return null;
  const characterClass = classById(character.classId as Parameters<typeof classById>[0]);
  const percent = player ? healthPercent(player.health, player.maxHealth) : 0;
  return (
    <button
      type="button"
      className={`party-frame party-frame--online ${selected ? "is-selected" : ""} ${player && player.health <= 0 ? "is-down" : ""}`}
      aria-label={`Target ${character.name}, online player`}
      aria-pressed={selected}
      disabled={!player}
      onClick={onSelect}
    >
      <span className="party-frame__sigil" style={{ "--party-class-color": characterClass.color } as CSSProperties}>{characterClass.sigil}</span>
      <span className="party-frame__body">
        <span className="party-frame__identity"><strong>{character.name}</strong><small>{member.role ? PARTY_ROLE_LABELS[member.role] : "Player"} · {member.username}</small></span>
        {player ? (
          <>
            <span className="party-frame__health" role="progressbar" aria-label={`${character.name} health`} aria-valuemin={0} aria-valuemax={player.maxHealth} aria-valuenow={Math.max(0, player.health)}>
              <i style={{ width: `${percent}%` }} />
              <b>{Math.ceil(player.health)} / {player.maxHealth}</b>
            </span>
            <span className="party-frame__resource" title={`${Math.floor(player.resource)} / ${player.maxResource} ${player.resourceName}`}>
              <i style={{ width: `${healthPercent(player.resource, player.maxResource)}%` }} />
            </span>
            <span className="party-frame__online-status"><i /> Live</span>
          </>
        ) : <span className="party-frame__online-status">Connecting…</span>}
      </span>
      <HealPopups popups={healPopups} targetId={onlinePlayerActorId(member.accountId)} />
    </button>
  );
}

/** Compact roster for the player plus the selected number of targetable AI allies. */
export function PartyFrames() {
  const { onResurrect } = useHudSurface();
  const character = useShellStore((state) => state.activeCharacter);
  const playerRole = useShellStore((state) => state.activeDungeonRole);
  const playerHealth = useCombatStore((state) => state.health);
  const playerMaxHealth = useCombatStore((state) => state.maxHealth);
  const playerResource = useCombatStore((state) => state.resource);
  const playerMaxResource = useCombatStore((state) => state.maxResource);
  const playerResourceName = useCombatStore((state) => state.resourceName);
  const showHealPopups = useCombatStore((state) => state.settings.showFloatingCombatText);
  const healPopups = usePartyHealPopups(showHealPopups);
  const playerAuraAbsorb = useCombatStore((state) => state.auras.reduce((total, aura) => (
    aura.targetId === PLAYER_AGGRO_ID
      ? total + aura.absorbs.reduce((sum, pool) => sum + pool.remaining, 0)
      : total
  ), 0));
  const playerShield = useCombatStore((state) => state.shield);
  const playerDispellableCount = useCombatStore((state) => state.auras.reduce((total, aura) => (
    aura.targetId === PLAYER_AGGRO_ID && auraDefinitionIsDispellableDebuff(aura.definition)
      ? total + 1
      : total
  ), 0));
  const playerDispellableNames = useCombatStore((state) => state.auras
    .filter((aura) => aura.targetId === PLAYER_AGGRO_ID && auraDefinitionIsDispellableDebuff(aura.definition))
    .map((aura) => aura.definition.name)
    .join(", "));
  const members = usePartyStore((state) => state.members);
  const gameMode = useGameStore((state) => state.gameMode);
  const bossCombat = useCombatStore((state) => partyResurrectionBlockedByBoss(state.mobs));
  const checkpoints = useResurrectionCheckpoints();
  const [requestedCheckpoint, setRequestedCheckpoint] = useState("entrance");
  const checkpointId = checkpoints.some((checkpoint) => checkpoint.id === requestedCheckpoint) ? requestedCheckpoint : "entrance";
  const selectedMemberId = usePartyStore((state) => state.selectedMemberId);
  const selfSelected = usePartyStore((state) => state.selfSelected);
  const routeBlocked = usePartyStore((state) => state.routeBlocked);
  const sessionOwnerId = useShellStore((state) => state.session?.ownerId ?? null);
  const onlineGroup = useOnlineGroupStore((state) => state.snapshot.group);
  const onlineActivity = useOnlineGroupStore((state) => state.activeActivity);
  const onlineSession = useOnlineSessionStore((state) => state.snapshot);
  const selectedOnlineActorId = useCombatStore((state) => state.selectedFriendlyActorId);
  const playerPercent = healthPercent(playerHealth, playerMaxHealth);
  const playerAbsorb = playerShield + playerAuraAbsorb;
  const playerAbsorbPercent = Math.min(100 - playerPercent, healthPercent(playerAbsorb, playerMaxHealth));
  const onlineMembers = onlineActivity && onlineGroup
    ? onlineGroup.members.filter((member) => member.accountId !== sessionOwnerId && member.character)
    : [];
  const onlinePlayersByAccount = new Map(
    (onlineSession?.players ?? []).map((player) => [player.accountId, player]),
  );
  const groupSize = members.length + onlineMembers.length + 1;

  const selectMember = (id: string) => {
    useCombatStore.getState().clearTarget();
    usePartyStore.getState().selectMember(id);
  };

  const selectSelf = () => {
    useCombatStore.getState().clearTarget();
    usePartyStore.getState().selectSelf();
  };

  const selectOnlineMember = (accountId: string) => {
    useCombatStore.getState().clearTarget();
    usePartyStore.getState().clearSelection();
    useCombatStore.getState().selectFriendlyActor(onlinePlayerActorId(accountId));
  };

  return (
    <section className="party-frames" aria-label={`${groupSize} player party`}>
      <header><span>Party</span><b className={routeBlocked ? "is-warning" : ""}>{routeBlocked ? "Route blocked" : `${groupSize} / ${groupSize}`}</b></header>
      {members.length ? <PartyCommandBar /> : null}
      <button
        type="button"
        className={`party-frame party-frame--player ${selfSelected ? "is-selected" : ""} ${playerDispellableCount ? "is-dispellable" : ""} ${playerHealth <= 0 ? "is-down" : ""}`}
        onClick={selectSelf}
        aria-pressed={selfSelected}
        aria-label={`Target ${character?.name ?? "Player"}, you`}
      >
        <span className="party-frame__sigil">YOU</span>
        <span className="party-frame__body">
          <span className="party-frame__identity"><strong>{character?.name ?? "Adventurer"}</strong><small>You · {PARTY_ROLE_LABELS[playerRole]}</small></span>
          {playerDispellableCount ? <span className="party-frame__dispel" title={playerDispellableNames}>DISPEL {playerDispellableCount}</span> : null}
          <span className="party-frame__health" role="progressbar" aria-label="Player health" aria-valuemin={0} aria-valuemax={playerMaxHealth} aria-valuenow={Math.max(0, playerHealth)}>
            <i style={{ width: `${playerPercent}%` }} />
            {playerAbsorb > 0 ? <em style={{ left: `${playerPercent}%`, width: `${playerAbsorbPercent}%` }} /> : null}
            <b>{Math.ceil(playerHealth)} / {playerMaxHealth}</b>
          </span>
          <span className="party-frame__resource" title={`${Math.floor(playerResource)} / ${playerMaxResource} ${playerResourceName}`}>
            <i style={{ width: `${healthPercent(playerResource, playerMaxResource)}%` }} />
          </span>
          <TimedEffectStrip
            targetId={null}
            targetIds={[null, PLAYER_AGGRO_ID]}
            className="timed-effect-strip--party"
          />
          <AuraStrip
            targetId={PLAYER_AGGRO_ID}
            className="aura-strip--party"
            hideLongTerm
            highlightDispellableDebuffs
          />
        </span>
        <HealPopups popups={healPopups} targetId={PLAYER_AGGRO_ID} />
      </button>
      {onlineMembers.map((member) => {
        const actorId = onlinePlayerActorId(member.accountId);
        return (
          <OnlineMemberFrame
            key={member.accountId}
            member={member}
            player={onlinePlayersByAccount.get(member.accountId) ?? null}
            selected={selectedOnlineActorId === actorId}
            onSelect={() => selectOnlineMember(member.accountId)}
            healPopups={healPopups}
          />
        );
      })}
      {members.map((member) => (
        <MemberFrame
          key={member.id}
          member={member}
          selected={member.id === selectedMemberId}
          onSelect={() => selectMember(member.id)}
          healPopups={healPopups}
        />
      ))}
      {gameMode === "dungeon" && members.some((member) => member.health <= 0) ? (
        <div className="party-resurrection">
          <ResurrectionDestination checkpoints={checkpoints} value={checkpointId} onChange={setRequestedCheckpoint}
            disabled={bossCombat || !onlineSessionOwnsWorldSimulation()} />
          <button
            type="button"
            className="party-rez-button"
            disabled={bossCombat || !onlineSessionOwnsWorldSimulation()}
            title={bossCombat ? "Unavailable during boss combat." : !onlineSessionOwnsWorldSimulation()
              ? "Only the party's simulation host can resurrect NPC teammates."
              : "Resurrect fallen NPC teammates at the selected checkpoint. They will return to you."}
            onClick={() => (onResurrect ?? resurrectDeadPartyMembers)(checkpointId)}
          >
            <strong>Rez dead members</strong>
            <small>{bossCombat ? "Unavailable during boss combat" : !onlineSessionOwnsWorldSimulation()
              ? "Simulation host only" : "Then return to you"}</small>
          </button>
        </div>
      ) : null}
    </section>
  );
}