using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class BattleState: MonsterViewpoint
{
    public delegate void Procedure();
    public event Procedure OnHeroPositionsSet;
    public event Procedure OnMonsterPositionsSet;

    private BattleHero[] heroes;

    private BattleMonster[] monsters;
    private BattleClock clock;
    private BuffManager buffManager;
    private TriggerManager triggerManager;
    private EnergyPool heroEnergy;
    private EnergyPool monsterEnergy;
    private BattleDeck<HeroCard> heroDeck;
    private BattleDeck<MonsterCard> monsterDeck;
    private PlayArea playArea;
    private InsightLevel insightLevel;

    private bool playedEmotion;

    private int STARTING_INSIGHT = 3;

    public BattleState(BattleParameters parameters) {
        this.clock = new BattleClock();
        this.buffManager = new BuffManager(this.clock);
        this.triggerManager = new TriggerManager(this.clock);
        this.heroEnergy = new EnergyPool();
        this.monsterEnergy = new EnergyPool();
        this.playArea = new PlayArea();
        this.insightLevel = new InsightLevel(STARTING_INSIGHT);

        InitHeroesAndMonsters(parameters);
    }

    private void InitHeroesAndMonsters(BattleParameters parameters) {
        this.heroes = new BattleHero[parameters.HeroIds.Length];
        for (int i = 0; i < this.heroes.Length; i++) {
            HeroId id = parameters.HeroIds[i];

            BattleHero hero = new BattleHero(id);
            hero.Init();
            this.heroes[i] = hero;
        }

        this.monsters = new BattleMonster[parameters.MonsterIds.Length];
        for (int i = 0; i < this.monsters.Length; i++) {
            MonsterId id = parameters.MonsterIds[i];

            BattleMonster monster = MonsterDatabase.createMonsterScript(id);
            monster.Init();
            this.monsters[i] = monster;
        }

        BattleParticipant[] cardOwners = new BattleParticipant[parameters.HCardIds.Length];
        for (int i = 0; i < parameters.HCardIds.Length; i++) {
            cardOwners[i] = this.heroes[parameters.HCardOwnerIndexes[i]];
        }
        this.heroDeck = new BattleDeck<HeroCard>(
            new HeroCardDatabase(), parameters.HCardIds.Cast<int>().ToArray(), cardOwners);

        BattleParticipant[] mCardOwners = new BattleParticipant[parameters.MCardIds.Length];
        for (int i = 0; i < parameters.MCardIds.Length; i++) {
            mCardOwners[i] = this.monsters[parameters.MCardOwnerIndexes[i]];
        }
        this.monsterDeck = new BattleDeck<MonsterCard>(
            new MonsterCardDatabase(), parameters.MCardIds.Cast<int>().ToArray(), mCardOwners);
    }

    public bool IsTeamsTurnToPlay(TeamChoice team) {
        if (team == TeamChoice.Heroes) {
            return this.clock.Now.RoundStep == RoundStep.StartOfHeroTurn;
        } else {
            return this.clock.Now.RoundStep == RoundStep.StartOfMonsterTurn;
        }
    }

    public bool CanPlayEmotion(TeamChoice team) {
        return !playedEmotion && IsTeamsTurnToPlay(team);
    }

    public void NotifyPlayedEmotion(TeamChoice team) {
        if (!CanPlayEmotion(team)) {
            throw new System.InvalidOperationException("BattleState received NotifyPlayedEmotion but "
                + "cannot play emotion");
        }

        playedEmotion = true;
    }

    public void ClearEmotionPlayed() {
        this.playedEmotion = false;
    }

    public void MoveTeamToNewPositions(TeamChoice team, int[] newPositions) {
        int n = newPositions.Length;
        if (team == TeamChoice.Heroes) {
            BattleHero[] newHeroes = new BattleHero[n];
            for (int i = 0; i < n; i++) {
                BattleHero hero = this.heroes[i];
                newHeroes[newPositions[i]] = hero;
            }
            this.heroes = newHeroes;
            TriggerOnHeroPositionsSet();
        } else {
            BattleMonster[] newMonsters = new BattleMonster[n];
            for (int i = 0; i < n; i++) {
                BattleMonster monster = this.monsters[i];
                newMonsters[newPositions[i]] = monster;
            }
            this.monsters = newMonsters;
            TriggerOnMonsterPositionsSet();
        }
    }

    private void TriggerOnHeroPositionsSet() {
        if (OnHeroPositionsSet != null) OnHeroPositionsSet();
    }

    private void TriggerOnMonsterPositionsSet() {
        if (OnMonsterPositionsSet != null) OnMonsterPositionsSet();
    }

    public BattleHero[] Heroes {get => this.heroes;}
    public BattleMonster[] Monsters {get => this.monsters;}
    public BattleClock Clock {get => this.clock;}
    public BuffManager BuffManager {get => this.buffManager;}
    public TriggerManager TriggerManager {get => this.triggerManager;}

    public EnergyPool HeroEnergy {get => this.heroEnergy;}
    public EnergyPool MonsterEnergy {get => this.monsterEnergy;}
    public BattleDeck<HeroCard> HeroDeck {get => this.heroDeck;}
    public BattleDeck<MonsterCard> MonsterDeck {get => this.monsterDeck;}
    public PlayArea PlayArea {get => this.playArea;}
    public InsightLevel InsightLevel {get => this.insightLevel;}
}