import { activateManastormStage } from "./manastormStageLoader";
import { useCombatStore } from "./combatStore";
import { synchronizeManastormAffixes } from "./manastormAffixRuntime";
import { useManastormStore } from "./manastormStore";
import { usePartyStore } from "./partyStore";
import { useGameStore } from "./store";
import {
  manastormChaoticLinkState,
  type ManastormChaoticLinkState,
} from "./manastormChaoticLink";
import type { MobCombatState } from "./combatStore";

export type ManastormResurrectionTarget =
  | { readonly kind: "player" }
  | { readonly kind: "companion"; readonly memberId: string };

export type ManastormDownResolution = "ignored" | "revived" | "downed" | "failed";

interface ChaoticLinkBossBaseline {
  readonly stageKey: string;
  baseMaxHealth: number;
  baseAttackDamage: number;
  baseHealthMultiplier: number;
  baseDamageMultiplier: number;
  appliedMaxHealth: number;
  appliedAttackDamage: number;
  appliedHealthMultiplier: number;
  appliedDamageMultiplier: number;
}

let chaoticLinkBossBaseline: ChaoticLinkBossBaseline | null = null;

function sameNumber(left: number, right: number): boolean {
  return Math.abs(left - right) <= 1e-9;
}

function currentLinkBaseline(
  stageKey: string,
  boss: MobCombatState,
): ChaoticLinkBossBaseline {
  if (chaoticLinkBossBaseline?.stageKey === stageKey) {
    const baseline = chaoticLinkBossBaseline;
    // Preserve unrelated runtime buffs applied after Chaotic Link. The affix
    // runtime, for example, can increase a boss multiplier independently.
    if (!sameNumber(boss.damageMultiplier, baseline.appliedDamageMultiplier)) {
      const ratio = boss.damageMultiplier / Math.max(0.01, baseline.appliedDamageMultiplier);
      baseline.baseDamageMultiplier *= ratio;
      baseline.baseAttackDamage = Math.max(1, Math.round(baseline.baseAttackDamage * ratio));
    }
    if (boss.maxHealth !== baseline.appliedMaxHealth) {
      const ratio = boss.maxHealth / Math.max(1, baseline.appliedMaxHealth);
      baseline.baseMaxHealth = Math.max(1, Math.round(baseline.baseMaxHealth * ratio));
      baseline.baseHealthMultiplier *= ratio;
    }
    return baseline;
  }

  chaoticLinkBossBaseline = {
    stageKey,
    baseMaxHealth: boss.maxHealth,
    baseAttackDamage: boss.attackDamage,
    baseHealthMultiplier: boss.healthMultiplier,
    baseDamageMultiplier: boss.damageMultiplier,
    appliedMaxHealth: boss.maxHealth,
    appliedAttackDamage: boss.attackDamage,
    appliedHealthMultiplier: boss.healthMultiplier,
    appliedDamageMultiplier: boss.damageMultiplier,
  };
  return chaoticLinkBossBaseline;
}

/**
 * Applies Ascension's published Chaotic Link stack tuning to the active boss.
 * The baseline is scoped to one stage revision, so ordinary dungeons and later
 * Manastorm stages cannot inherit this floor's aura.
 */
export function synchronizeManastormChaoticLink(): ManastormChaoticLinkState | null {
  const manastorm = useManastormStore.getState();
  const encounter = manastorm.currentEncounter;
  if (!encounter) return null;
  const combat = useCombatStore.getState();
  const link = manastormChaoticLinkState(encounter, combat.mobs);
  const boss = combat.mobs[encounter.bossRuntimeId];
  if (!boss || boss.dead) return link;

  const stageKey = `${manastorm.catalogId}:${manastorm.transitionRevision}:${encounter.id}:${encounter.bossRuntimeId}`;
  const baseline = currentLinkBaseline(stageKey, boss);
  const maxHealth = Math.max(
    1,
    Math.round(baseline.baseMaxHealth * link.bossHealthMultiplier),
  );
  const attackDamage = Math.max(
    1,
    Math.round(baseline.baseAttackDamage * link.bossDamageMultiplier),
  );
  const healthMultiplier = baseline.baseHealthMultiplier * link.bossHealthMultiplier;
  const damageMultiplier = baseline.baseDamageMultiplier * link.bossDamageMultiplier;
  if (
    boss.maxHealth === maxHealth
    && boss.attackDamage === attackDamage
    && sameNumber(boss.healthMultiplier, healthMultiplier)
    && sameNumber(boss.damageMultiplier, damageMultiplier)
  ) {
    return link;
  }

  const healthRatio = boss.health / Math.max(1, boss.maxHealth);
  const health = Math.max(1, Math.min(maxHealth, Math.round(maxHealth * healthRatio)));
  baseline.appliedMaxHealth = maxHealth;
  baseline.appliedAttackDamage = attackDamage;
  baseline.appliedHealthMultiplier = healthMultiplier;
  baseline.appliedDamageMultiplier = damageMultiplier;
  useCombatStore.setState((state) => {
    const current = state.mobs[encounter.bossRuntimeId];
    if (!current || current.dead) return state;
    return {
      mobs: {
        ...state.mobs,
        [encounter.bossRuntimeId]: {
          ...current,
          health,
          maxHealth,
          healthMultiplier,
          damageMultiplier,
          attackDamage,
        },
      },
    };
  });
  return link;
}

/** Keeps total group size (player plus companions) within the selected 1-5 contract. */
export function synchronizeManastormPartySize(): void {
  const partySize = useManastormStore.getState().partySize;
  const companionCount = Math.max(0, partySize - 1);
  const party = usePartyStore.getState();
  if (party.members.length <= companionCount) return;
  const members = party.members.slice(0, companionCount);
  const memberIds = new Set(members.map((member) => member.id));
  usePartyStore.setState({
    members,
    selectedMemberId: party.selectedMemberId && memberIds.has(party.selectedMemberId)
      ? party.selectedMemberId
      : null,
    activeMobId: null,
    objectiveBossId: null,
    memberTargetIds: Object.fromEntries(
      Object.entries(party.memberTargetIds).filter(([memberId]) => memberIds.has(memberId)),
    ),
  });
}

function activateCurrentStage(preserveCharacter: boolean): boolean {
  const encounter = useManastormStore.getState().currentEncounter;
  if (!encounter) return false;
  const result = activateManastormStage(
    encounter,
    undefined,
    preserveCharacter,
    useGameStore.getState().gmTestMode,
  );
  if (result.activated) synchronizeManastormPartySize();
  return result.activated;
}

/**
 * Reconciles the staged Manastorm flow with authoritative combat state.
 * Keeping this outside React makes the same rules usable by the bridge and
 * by headless integration tests.
 */
export function synchronizeManastormCombat(): void {
  synchronizeManastormAffixes();
  const manastorm = useManastormStore.getState();
  const encounter = manastorm.currentEncounter;
  if (!encounter) return;
  const link = synchronizeManastormChaoticLink();
  const mobs = useCombatStore.getState().mobs;

  if (manastorm.status === "clearing-trash") {
    const boss = mobs[encounter.bossRuntimeId];
    // Skipping guardians is a legal high-risk route. If the strengthened boss
    // dies first, advance the objective without requiring obsolete trash.
    if (boss?.dead) {
      manastorm.observeTrash(true);
      useManastormStore.getState().observeBoss(boss.dead, boss.looted);
      return;
    }
    // Around half of the linked creatures remove every aura stack. Remaining
    // guardians stay in the encounter and can still be killed for safety.
    manastorm.observeTrash(link?.broken ?? false);
    return;
  }

  if (manastorm.status === "fighting" || manastorm.status === "awaiting-loot") {
    const boss = mobs[encounter.bossRuntimeId];
    if (boss) manastorm.observeBoss(boss.dead, boss.looted);
  }
}

export function advanceManastormSession(random: () => number = Math.random): boolean {
  const manastorm = useManastormStore.getState();
  if (!manastorm.beginTransition()) return false;

  const encounter = useManastormStore.getState().prepareNextEncounter(random);
  if (!encounter) {
    if (useManastormStore.getState().status === "completed") return true;
    useManastormStore.getState().failRun();
    return false;
  }

  if (!activateCurrentStage(true)) {
    useManastormStore.getState().failRun();
    return false;
  }

  useManastormStore.getState().finishTransition();
  return true;
}

function activeCompanions() {
  const companionCount = Math.max(0, useManastormStore.getState().partySize - 1);
  return usePartyStore.getState().members.slice(0, companionCount);
}

function firstFallenActor(): ManastormResurrectionTarget | null {
  if (useCombatStore.getState().health <= 0) return { kind: "player" };
  const companion = activeCompanions().find((member) => member.health <= 0);
  return companion ? { kind: "companion", memberId: companion.id } : null;
}

function targetIsFallen(target: ManastormResurrectionTarget): boolean {
  if (target.kind === "player") return useCombatStore.getState().health <= 0;
  return Boolean(activeCompanions().find(
    (member) => member.id === target.memberId && member.health <= 0,
  ));
}

function reviveTarget(target: ManastormResurrectionTarget): boolean {
  if (target.kind === "player") {
    const combat = useCombatStore.getState();
    if (combat.health > 0 || combat.maxHealth <= 0) return false;
    combat.revivePlayer(1);
    return useCombatStore.getState().health > 0;
  }

  let revived = false;
  usePartyStore.setState((state) => ({
    members: state.members.map((member) => {
      if (member.id !== target.memberId || member.health > 0 || member.maxHealth <= 0) {
        return member;
      }
      revived = true;
      return {
        ...member,
        health: member.maxHealth,
        status: state.command === "stop" ? "holding" : "ready",
        nextActionAt: 0,
      };
    }),
  }));
  return revived;
}

/**
 * Spends one of the five floor-local shared charges to revive exactly one
 * fallen actor. Encounter, mob, position, resource, and other party state stay
 * intact.
 */
export function resurrectManastormSession(
  requestedTarget?: ManastormResurrectionTarget,
): boolean {
  const manastorm = useManastormStore.getState();
  const target = requestedTarget ?? firstFallenActor();
  if (!manastorm.currentEncounter || !target || !targetIsFallen(target)) return false;
  if (!manastorm.useResurrectionCharge()) return false;
  return reviveTarget(target);
}

export function manastormPartyIsDefeated(): boolean {
  return useCombatStore.getState().health <= 0
    && activeCompanions().every((member) => member.health <= 0);
}

/**
 * Resolves a newly downed actor without spending a shared resurrection on the
 * player's behalf. A charge can be used explicitly from the defeated prompt;
 * only a full-party defeat with no remaining charge fails the run.
 */
export function resolveManastormActorDown(
  target: ManastormResurrectionTarget,
): ManastormDownResolution {
  if (!targetIsFallen(target)) return "ignored";
  if (!manastormPartyIsDefeated()) return "downed";
  if (useManastormStore.getState().resurrectionCharges > 0) return "downed";
  useManastormStore.getState().failRun();
  return "failed";
}

export function restartManastormAtCheckpoint(random: () => number = Math.random): boolean {
  const encounter = useManastormStore.getState().restartFromCheckpoint(random);
  if (!encounter) return false;
  if (!activateCurrentStage(true)) {
    useManastormStore.getState().failRun();
    return false;
  }
  return true;
}