// ─── Combat Slice ─────────────────────────────────────────────────────────────
// Manages spire climbing, combat, and floor progression

import type { StateCreator } from 'zustand';
import type { GameState, GameAction, SpellCost } from '../types';
import { GUARDIANS, SPELLS_DEF, ELEMENTS, ELEMENT_OPPOSITES } from '../constants';
import { getFloorMaxHP, getFloorElement, calcDamage, computePactMultiplier, canAffordSpellCost, deductSpellCost } from './computed';
import { computeEffects, hasSpecial, SPECIAL_EFFECTS } from '../upgrade-effects';

export interface CombatSlice {
  // State
  currentFloor: number;
  floorHP: number;
  floorMaxHP: number;
  maxFloorReached: number;
  activeSpell: string;
  currentAction: GameAction;
  castProgress: number;

  // Actions
  setAction: (action: GameAction) => void;
  setSpell: (spellId: string) => void;
  getDamage: (spellId: string) => number;

  // Internal combat processing
  processCombat: (deltaHours: number) => Partial<GameState>;
}

export const createCombatSlice = (
  set: StateCreator<GameState>['set'],
  get: () => GameState
): CombatSlice => ({
  currentFloor: 1,
  floorHP: getFloorMaxHP(1),
  floorMaxHP: getFloorMaxHP(1),
  maxFloorReached: 1,
  activeSpell: 'manaBolt',
  currentAction: 'meditate',
  castProgress: 0,

  setAction: (action: GameAction) => {
    set((state) => ({
      currentAction: action,
      meditateTicks: action === 'meditate' ? state.meditateTicks : 0,
    }));
  },

  setSpell: (spellId: string) => {
    const state = get();
    if (state.spells[spellId]?.learned) {
      set({ activeSpell: spellId });
    }
  },

  getDamage: (spellId: string) => {
    const state = get();
    const floorElem = getFloorElement(state.currentFloor);
    return calcDamage(state, spellId, floorElem);
  },

  processCombat: (deltaHours: number) => {
    const state = get();
    if (state.currentAction !== 'climb') return {};

    const spellId = state.activeSpell;
    const spellDef = SPELLS_DEF[spellId];
    if (!spellDef) return {};

    const effects = computeEffects(state.skillUpgrades || {}, state.skillTiers || {});
    const baseAttackSpeed = 1 + (state.skills.quickCast || 0) * 0.05;
    const totalAttackSpeed = baseAttackSpeed * effects.attackSpeedMultiplier;
    const spellCastSpeed = spellDef.castSpeed || 1;
    const progressPerTick = deltaHours * spellCastSpeed * totalAttackSpeed;

    let castProgress = (state.castProgress || 0) + progressPerTick;
    let rawMana = state.rawMana;
    let elements = state.elements;
    let totalManaGathered = state.totalManaGathered;
    let currentFloor = state.currentFloor;
    let floorHP = state.floorHP;
    let floorMaxHP = state.floorMaxHP;
    let maxFloorReached = state.maxFloorReached;
    let signedPacts = state.signedPacts;
    let pendingPactOffer = state.pendingPactOffer;
    const log = [...state.log];
    const skills = state.skills;

    const floorElement = getFloorElement(currentFloor);

    while (castProgress >= 1 && canAffordSpellCost(spellDef.cost, rawMana, elements)) {
      // Deduct cost
      const afterCost = deductSpellCost(spellDef.cost, rawMana, elements);
      rawMana = afterCost.rawMana;
      elements = afterCost.elements;
      totalManaGathered += spellDef.cost.amount;

      // Calculate damage
      let dmg = calcDamage(state, spellId, floorElement);
      dmg = dmg * effects.baseDamageMultiplier + effects.baseDamageBonus;

      // Executioner: +100% damage to enemies below 25% HP
      if (hasSpecial(effects, SPECIAL_EFFECTS.EXECUTIONER) && floorHP / floorMaxHP < 0.25) {
        dmg *= 2;
      }

      // Berserker: +50% damage when below 50% mana
      const maxMana = 100; // Would need proper max mana calculation
      if (hasSpecial(effects, SPECIAL_EFFECTS.BERSERKER) && rawMana < maxMana * 0.5) {
        dmg *= 1.5;
      }

      // Spell echo - chance to cast again
      const echoChance = (skills.spellEcho || 0) * 0.1;
      if (Math.random() < echoChance) {
        dmg *= 2;
        log.unshift('✨ Spell Echo! Double damage!');
      }

      // Apply damage
      floorHP = Math.max(0, floorHP - dmg);
      castProgress -= 1;

      if (floorHP <= 0) {
        const wasGuardian = GUARDIANS[currentFloor];
        if (wasGuardian && !signedPacts.includes(currentFloor)) {
          pendingPactOffer = currentFloor;
          log.unshift(`⚔️ ${wasGuardian.name} defeated! They offer a pact...`);
        } else if (!wasGuardian) {
          if (currentFloor % 5 === 0) {
            log.unshift(`🏰 Floor ${currentFloor} cleared!`);
          }
        }

        currentFloor = currentFloor + 1;
        if (currentFloor > 100) currentFloor = 100;
        floorMaxHP = getFloorMaxHP(currentFloor);
        floorHP = floorMaxHP;
        maxFloorReached = Math.max(maxFloorReached, currentFloor);
        castProgress = 0;
      }
    }

    return {
      rawMana,
      elements,
      totalManaGathered,
      currentFloor,
      floorHP,
      floorMaxHP,
      maxFloorReached,
      signedPacts,
      pendingPactOffer,
      castProgress,
      log,
    };
  },
});