// ─── Combat Tick Callback Builder ─────────────────────────────────────────────
// Extracts the large combat callback lambdas from gameStore.ts tick()
// to keep the coordinator under the 400-line file limit.

import { HOURS_PER_TICK } from '../../constants';
import { getGuardianForFloor } from '../../data/guardian-encounters';
import { hasSpecial, SPECIAL_EFFECTS } from '../../effects/special-effects';
import type { ComputedEffects } from '../../effects/upgrade-effects.types';

interface BuildCombatCallbacksParams {
  ctx: {
    combat: {
      floorHP: number;
      floorMaxHP: number;
      currentFloor: number;
      guardianShield: number;
      guardianShieldMax: number;
      guardianBarrier: number;
      guardianBarrierMax: number;
    };
  };
  effects: ComputedEffects;
  maxMana: number;
  addLog: (msg: string) => void;
  useCombatStore: { setState: (s: Record<string, unknown>) => void };
  usePrestigeStore: { getState: () => { addDefeatedGuardian: (floor: number) => void } };
}

export function buildCombatCallbacks(params: BuildCombatCallbacksParams) {
  const { ctx, effects, maxMana, addLog, useCombatStore, usePrestigeStore } = params;

  const onFloorCleared = (floor: number, wasGuardian: boolean) => {
    if (wasGuardian) {
      const defeatedGuardian = getGuardianForFloor(floor);
      addLog((defeatedGuardian?.name || 'Unknown') + ' defeated! Visit the Grimoire to sign a pact.');
      usePrestigeStore.getState().addDefeatedGuardian(floor);
    } else if (floor % 5 === 0) {
      addLog('Floor ' + floor + ' cleared!');
    }
    useCombatStore.setState({ guardianShield: 0, guardianShieldMax: 0, guardianBarrier: 0, guardianBarrierMax: 0 });
  };

  // Returns a function matching the processCombatTick onDamageDealt signature.
  // The returned function closes over the current tick's rawMana/elements references.
  const makeOnDamageDealt = (rawManaRef: () => number, elementsRef: () => Record<string, { current: number; max: number; unlocked: boolean }>) => {
    return (damage: number) => {
      const rawMana = rawManaRef();
      const elements = elementsRef();
      let dmg = damage;
      if (hasSpecial(effects, SPECIAL_EFFECTS.EXECUTIONER) && ctx.combat.floorHP / ctx.combat.floorMaxHP < 0.25) {
        dmg *= 2;
      }
      if (hasSpecial(effects, SPECIAL_EFFECTS.BERSERKER) && rawMana < maxMana * 0.5) {
        dmg *= 1.5;
      }

      const guardian = getGuardianForFloor(ctx.combat.currentFloor);
      if (guardian && (guardian.shield || guardian.barrier || guardian.healthRegen)) {
        let shield = ctx.combat.guardianShield;
        const shieldMax = ctx.combat.guardianShieldMax;
        let barrier = ctx.combat.guardianBarrier;
        const barrierMax = ctx.combat.guardianBarrierMax;

        if (guardian.shieldRegen && shield < shieldMax) {
          shield = Math.min(shieldMax, shield + guardian.shieldRegen * HOURS_PER_TICK);
        }
        if (guardian.barrierRegen && barrier < barrierMax) {
          barrier = Math.min(barrierMax, barrier + guardian.barrierRegen * HOURS_PER_TICK);
        }

        if (shield > 0 && dmg > 0) {
          const absorb = Math.min(shield, dmg);
          shield -= absorb;
          dmg -= absorb;
        }
        if (barrier > 0 && dmg > 0) {
          dmg *= (1 - barrier);
        }
        if (guardian.healthRegen && guardian.healthRegen > 0) {
          const healAmount = guardian.healthRegenIsPercent
            ? Math.floor(ctx.combat.floorMaxHP * guardian.healthRegen / 100 * HOURS_PER_TICK)
            : Math.floor(guardian.healthRegen * HOURS_PER_TICK);
          dmg -= healAmount;
        }

        useCombatStore.setState({
          guardianShield: shield,
          guardianShieldMax: shieldMax,
          guardianBarrier: barrier,
          guardianBarrierMax: barrierMax,
        });
      }

      return { rawMana, elements, modifiedDamage: dmg };
    };
  };

  return { onFloorCleared, makeOnDamageDealt };
}