import { useEffect, useState } from "react";
import { abilityById } from "../game/abilityCatalog";
import { PLAYER_AGGRO_ID } from "../game/aggro";
import { useCombatStore } from "../game/combatStore";
import { formatTimedEffectTimer, timedEffectRemainingMs } from "../game/timedEffectDisplay";
import { AuraStrip } from "./AuraStrip";
import {
  auraDisplaysInPlayerStatusPanel,
  auraDescription,
  auraDisplayName,
  groupAurasForDisplay,
} from "./auraDisplay";
import { TimedEffectStrip } from "./TimedEffectStrip";
import {
  timedEffectDescription,
  type StatusEffectInspection,
} from "./statusEffectInspection";

const PLAYER_EFFECT_TARGETS: readonly (string | null)[] = [null, PLAYER_AGGRO_ID];
const TOOLTIP_ID = "player-status-effect-tooltip";

function statusLabel(disposition: StatusEffectInspection["disposition"]): string {
  return disposition === "buff" ? "Buff" : "Debuff";
}

export function PlayerStatusPanel({ now }: { readonly now: number }) {
  const auras = useCombatStore((state) => state.auras);
  const effects = useCombatStore((state) => state.effects);
  const shield = useCombatStore((state) => state.shield);
  const shieldExpiresAt = useCombatStore((state) => state.shieldExpiresAt);
  const [inspected, setInspected] = useState<StatusEffectInspection | null>(null);

  const activeAuras = groupAurasForDisplay(auras.filter((aura) => (
    auraDisplaysInPlayerStatusPanel(aura, now)
  )));
  const activeEffects = effects.filter((effect) => (
    PLAYER_EFFECT_TARGETS.includes(effect.targetId)
    && timedEffectRemainingMs(effect, now) > 0
  ));
  const shieldActive = shield > 0 && (shieldExpiresAt <= 0 || shieldExpiresAt > now);
  const buffCount = activeAuras.filter((aura) => aura.definition.disposition === "buff").length
    + activeEffects.filter((effect) => effect.kind === "hot").length
    + (shieldActive ? 1 : 0);
  const debuffCount = activeAuras.filter((aura) => aura.definition.disposition === "debuff").length
    + activeEffects.filter((effect) => effect.kind === "dot").length;
  const activeInspectionIds = new Set([
    ...activeAuras.map((aura) => aura.instanceId),
    ...activeEffects.map((effect) => effect.id),
    ...(shieldActive ? ["player-absorb-shield"] : []),
  ]);
  const inspectedIsActive = inspected ? activeInspectionIds.has(inspected.id) : true;
  const shieldInspection: StatusEffectInspection = {
    id: "player-absorb-shield",
    name: "Absorb Shield",
    disposition: "buff",
    description: `Absorbs up to ${Math.ceil(shield)} incoming damage before health is lost.`,
    remainingLabel: shieldExpiresAt > now
      ? `${formatTimedEffectTimer(shieldExpiresAt - now)} remaining`
      : "Until depleted",
    stacks: 1,
  };
  const liveInspection = inspected && inspectedIsActive
    ? (() => {
        if (inspected.id === shieldInspection.id) return shieldInspection;
        const aura = activeAuras.find((candidate) => candidate.instanceId === inspected.id);
        if (aura) {
          const remaining = aura.expiresAt === null
            ? "Permanent"
            : `${formatTimedEffectTimer(Math.max(0, aura.expiresAt - now))} remaining`;
          return {
            ...inspected,
            name: auraDisplayName(aura.definition),
            disposition: aura.definition.disposition,
            description: auraDescription(aura),
            remainingLabel: remaining,
            stacks: aura.stacks,
            ...(aura.definition.dispelCategory
              ? { dispelCategory: aura.definition.dispelCategory }
              : {}),
          } satisfies StatusEffectInspection;
        }
        const effect = activeEffects.find((candidate) => candidate.id === inspected.id);
        if (effect) {
          const ability = abilityById(effect.sourceAbilityId);
          return {
            ...inspected,
            name: ability?.name ?? effect.sourceAbilityId,
            disposition: effect.kind === "hot" ? "buff" : "debuff",
            description: timedEffectDescription(effect.kind, ability?.description),
            remainingLabel: `${formatTimedEffectTimer(timedEffectRemainingMs(effect, now))} remaining`,
          } satisfies StatusEffectInspection;
        }
        return inspected;
      })()
    : null;

  useEffect(() => {
    if (inspected && !inspectedIsActive) setInspected(null);
  }, [inspected, inspectedIsActive]);

  return (
    <section className="player-status-panel" aria-label="Active buffs and debuffs">
      <div
        className="player-status-panel__section player-status-panel__section--buffs"
        aria-label={`${buffCount} active ${buffCount === 1 ? "buff" : "buffs"}`}
      >
        <header><strong>Buffs</strong><b>{buffCount}</b></header>
        <div className="player-status-panel__icons">
          {shieldActive ? (
            <span
              className="aura aura--buff aura--inspectable player-status-panel__synthetic"
              tabIndex={0}
              aria-label={`Absorb Shield, buff, ${shieldInspection.remainingLabel}`}
              aria-describedby={TOOLTIP_ID}
              onPointerEnter={() => setInspected(shieldInspection)}
              onPointerLeave={(event) => {
                if (event.currentTarget !== document.activeElement) setInspected(null);
              }}
              onFocus={() => setInspected(shieldInspection)}
              onBlur={() => setInspected(null)}
            >
              <span className="aura__initial" aria-hidden="true">S</span>
              <b className="aura__timer" aria-hidden="true">
                {shieldExpiresAt > now ? formatTimedEffectTimer(shieldExpiresAt - now) : ""}
              </b>
            </span>
          ) : null}
          <AuraStrip
            targetId={PLAYER_AGGRO_ID}
            dispositions={["buff"]}
            className="player-status-panel__strip"
            onInspect={setInspected}
            tooltipId={TOOLTIP_ID}
          />
          <TimedEffectStrip
            targetId={null}
            targetIds={PLAYER_EFFECT_TARGETS}
            kinds={["hot"]}
            className="player-status-panel__strip"
            onInspect={setInspected}
            tooltipId={TOOLTIP_ID}
          />
          {!buffCount ? <span className="player-status-panel__empty">None active</span> : null}
        </div>
      </div>

      <div
        className="player-status-panel__section player-status-panel__section--debuffs"
        aria-label={`${debuffCount} active ${debuffCount === 1 ? "debuff" : "debuffs"}`}
      >
        <header><strong>Debuffs</strong><b>{debuffCount}</b></header>
        <div className="player-status-panel__icons">
          <AuraStrip
            targetId={PLAYER_AGGRO_ID}
            dispositions={["debuff"]}
            className="player-status-panel__strip"
            onInspect={setInspected}
            tooltipId={TOOLTIP_ID}
          />
          <TimedEffectStrip
            targetId={null}
            targetIds={PLAYER_EFFECT_TARGETS}
            kinds={["dot"]}
            className="player-status-panel__strip"
            onInspect={setInspected}
            tooltipId={TOOLTIP_ID}
          />
          {!debuffCount ? <span className="player-status-panel__empty">None active</span> : null}
        </div>
      </div>

      {liveInspection ? (
        <div
          id={TOOLTIP_ID}
          className={`player-status-tooltip player-status-tooltip--${liveInspection.disposition}`}
          role="tooltip"
        >
          <header>
            <strong>{liveInspection.name}</strong>
            <span>{statusLabel(liveInspection.disposition)}</span>
          </header>
          <p>{liveInspection.description}</p>
          <footer>
            <span>{liveInspection.remainingLabel}</span>
            {liveInspection.stacks > 1 ? <span>{liveInspection.stacks} stacks</span> : null}
            {liveInspection.dispelCategory ? <span>{liveInspection.dispelCategory}</span> : null}
            {liveInspection.targetLabel ? <span>Target: {liveInspection.targetLabel}</span> : null}
          </footer>
        </div>
      ) : null}
    </section>
  );
}