package mage.abilities.effects;

import mage.MageObjectReference;
import mage.abilities.Ability;
import mage.abilities.CompoundAbility;
import mage.abilities.keyword.ChangelingAbility;
import mage.constants.*;
import mage.filter.Filter;
import mage.filter.predicate.Predicate;
import mage.filter.predicate.Predicates;
import mage.game.Game;
import mage.game.stack.Spell;
import mage.game.stack.StackObject;
import mage.players.Player;
import mage.target.targetpointer.TargetPointer;
import mage.watchers.common.EndStepCountWatcher;

import java.util.*;

/**
 * @author BetaSteward_at_googlemail.com, JayDi85
 */
public abstract class ContinuousEffectImpl extends EffectImpl implements ContinuousEffect {

    protected Duration duration;
    protected Layer layer;
    protected SubLayer sublayer;
    protected long order;
    protected boolean used = false;
    protected boolean discarded = false; // for manual effect discard

    // 611.2c
    // Two types of affected objects (targets):
    // 1. Static targets - setup it on ability resolve or effect creation (effect's init method, only once)
    // 2. Dynamic targets - can be changed after resolve, so use targetPointer, filters or own lists to find affected objects
    //
    // If your ability/effect supports multi use cases (one time use, static, target pointers) then affectedObjectsSet can be useful:
    // * affectedObjectsSet - true on static objects and false on dynamic objects (see rules from 611.2c)
    // Full implement example: GainAbilityTargetEffect
    //
    // is null before being initialized. Any access attempt computes it.
    private Boolean affectedObjectsSet = null;
    protected List<MageObjectReference> affectedObjectList = new ArrayList<>();

    protected boolean temporary = false;
    protected EnumSet<DependencyType> dependencyTypes; // this effect has the dependencyTypes defined here
    protected EnumSet<DependencyType> dependendToTypes; // this effect is dependent to this types
    /*
     A Characteristic Defining Ability (CDA) is an ability that defines a characteristic of a card or token.
     There are 3 specific rules that distinguish a CDA from other abilities.
     1) A CDA can only define a characteristic of either the card or token it comes from.
     2) A CDA can not be triggered, activated, or conditional.
     3) A CDA must define a characteristic. Usually color, power and/or toughness, or sub-type.
     */
    protected boolean characterDefining = false;

    // until your next turn or until end of your next turn
    private UUID startingControllerId; // player to check for turn duration (can't different with real controller ability)
    private boolean startingTurnWasActive; // effect started during related players turn and related players turn was already active
    private int effectStartingOnTurn = 0; // turn the effect started
    private int effectStartingEndStep = 0;
    private int nextTurnNumber = Integer.MAX_VALUE; // effect is waiting for a step during your next turn, we store it if found.
    // set to the turn number on your next turn.
    private int effectStartingStepNum = 0; // Some continuous are waiting for the next step of a kind.
    // Avoid miscancelling if the start step is of that kind.

    protected ContinuousEffectImpl(Duration duration, Outcome outcome) {
        super(outcome);
        this.duration = duration;
        this.order = 0;
        this.effectType = EffectType.CONTINUOUS;
        this.dependencyTypes = EnumSet.noneOf(DependencyType.class);
        this.dependendToTypes = EnumSet.noneOf(DependencyType.class);
    }

    protected ContinuousEffectImpl(Duration duration, Layer layer, SubLayer sublayer, Outcome outcome) {
        this(duration, outcome);
        this.layer = layer;
        this.sublayer = sublayer;
    }

    protected ContinuousEffectImpl(final ContinuousEffectImpl effect) {
        super(effect);
        this.duration = effect.duration;
        this.layer = effect.layer;
        this.sublayer = effect.sublayer;
        this.order = effect.order;
        this.used = effect.used;
        this.discarded = effect.discarded;
        this.affectedObjectsSet = effect.affectedObjectsSet;
        this.affectedObjectList.addAll(effect.affectedObjectList);
        this.temporary = effect.temporary;
        this.startingControllerId = effect.startingControllerId;
        this.startingTurnWasActive = effect.startingTurnWasActive;
        this.effectStartingOnTurn = effect.effectStartingOnTurn;
        this.effectStartingEndStep = effect.effectStartingEndStep;
        this.dependencyTypes = effect.dependencyTypes;
        this.dependendToTypes = effect.dependendToTypes;
        this.characterDefining = effect.characterDefining;
        this.nextTurnNumber = effect.nextTurnNumber;
        this.effectStartingStepNum = effect.effectStartingStepNum;
    }

    @Override
    public ContinuousEffectImpl setDuration(Duration duration) {
        this.duration = duration;
        return this;
    }

    @Override
    public Duration getDuration() {
        return duration;
    }

    @Override
    public boolean apply(Layer layer, SubLayer sublayer, Ability source, Game game) {
        if (this.layer == layer && this.sublayer == sublayer) {
            return apply(game, source);
        }
        return false;
    }

    @Override
    public long getOrder() {
        return order;
    }

    @Override
    public void setOrder(long order) {
        this.order = order;
    }

    @Override
    public boolean hasLayer(Layer layer) {
        return this.layer == layer;
    }

    @Override
    public boolean isUsed() {
        return used;
    }

    @Override
    public boolean isDiscarded() {
        return discarded;
    }

    /**
     * Sets the discarded state of the effect. So it will be removed on next
     * check.
     */
    @Override
    public void discard() {
        this.used = true; // to prevent further usage before effect is removed
        this.discarded = true;
    }

    @Override
    public final void initNewTargetPointer() {
        // continuous effect uses init code, so do nothing here
    }

    @Override
    public void init(Ability source, Game game) {
        init(source, game, game.getActivePlayerId());
    }

    @Override
    public void init(Ability source, Game game, UUID activePlayerId) {
        getTargetPointer().init(game, source);
        if (this.affectedObjectsSet == null) {
            initAffectedObjectsSet(source);
        }
        setStartingControllerAndTurnNum(game, source.getControllerId(), activePlayerId);
    }

    /**
     * Computes affectedObjectsSet boolean from the source object.
     */
    private void initAffectedObjectsSet(Ability source) {
        // 20210112 - 611.2c
        // 611.2c  If a continuous effect generated by the resolution of a spell or ability modifies the
        // characteristics or changes the controller of any objects, the set of objects it affects is
        // determined when that continuous effect begins. After that point, the set won’t change.
        // (Note that this works differently than a continuous effect from a static ability.)
        // A continuous effect generated by the resolution of a spell or ability that doesn’t
        // modify the characteristics or change the controller of any objects modifies the
        // rules of the game, so it can affect objects that weren’t affected when that continuous
        // effect began.If a single continuous effect has parts that modify the characteristics or
        // changes the controller of any objects and other parts that don’t, the set of objects
        // each part applies to is determined independently.
        this.affectedObjectsSet = false;
        if (AbilityType.STATIC != source.getAbilityType()) {
            if (layer != null) {
                switch (layer) {
                    case CopyEffects_1:
                    case ControlChangingEffects_2:
                    case TextChangingEffects_3:
                    case TypeChangingEffects_4:
                    case ColorChangingEffects_5:
                    case AbilityAddingRemovingEffects_6:
                    case PTChangingEffects_7:
                        this.affectedObjectsSet = true;
                }
            } else if (hasLayer(Layer.CopyEffects_1)
                    || hasLayer(Layer.ControlChangingEffects_2)
                    || hasLayer(Layer.TextChangingEffects_3)
                    || hasLayer(Layer.TypeChangingEffects_4)
                    || hasLayer(Layer.ColorChangingEffects_5)
                    || hasLayer(Layer.AbilityAddingRemovingEffects_6)
                    || hasLayer(Layer.PTChangingEffects_7)) {
                this.affectedObjectsSet = true;
            }
        }
    }

    /**
     * This is a workaround when trying to access affectObjectsSet during init, before
     * ContinuousEffectImpl::init is called.
     * <p>
     * TODO: should be investigated how to modify all continuous effects to call super.init()
     *       before doing their own changes. At which point there is no longer need for this
     *       workaround.
     */
    protected boolean getAffectedObjectsSetAtInit(Ability source) {
        if (this.affectedObjectsSet == null) {
            initAffectedObjectsSet(source);
        }
        return this.affectedObjectsSet;
    }

    /**
     * Use this getter in other places than overriden calls, most likely the apply method.
     */
    protected boolean getAffectedObjectsSet() {
        if (this.affectedObjectsSet == null) {
            return false;
        }
        return this.affectedObjectsSet;
    }

    protected void setAffectedObjectsSet(boolean affectedObjectsSet) {
        this.affectedObjectsSet = affectedObjectsSet;
    }

    @Override
    public UUID getStartingController() {
        return startingControllerId;
    }

    protected int getEffectStartingOnTurn() {
        return effectStartingOnTurn;
    }

    @Override
    public void setStartingControllerAndTurnNum(Game game, UUID startingController, UUID activePlayerId) {
        this.startingControllerId = startingController;
        this.startingTurnWasActive = activePlayerId != null
                && activePlayerId.equals(startingController); // you can't use "game" for active player cause it's called from tests/cheat too
        this.effectStartingOnTurn = game.getTurnNum();
        this.effectStartingEndStep = EndStepCountWatcher.getCount(startingController, game);
        this.effectStartingStepNum = game.getState().getStepNum();
    }

    @Override
    public boolean isYourNextTurn(Game game) {
        return effectStartingOnTurn < game.getTurnNum()
                && game.isActivePlayer(startingControllerId);
    }

    @Override
    public boolean isYourNextEndStep(Game game) {
        return EndStepCountWatcher.getCount(startingControllerId, game) > effectStartingEndStep;
    }

    public boolean isEndCombatOfYourNextTurn(Game game) {
        int currentTurn = game.getTurnNum();
        if (nextTurnNumber != Integer.MAX_VALUE && nextTurnNumber < currentTurn) {
            return false; // This is a turn after your next turn.
        }
        if (nextTurnNumber == Integer.MAX_VALUE && isYourNextTurn(game)) {
            nextTurnNumber = currentTurn;
        }

        return isYourNextTurn(game)
                && game.getPhase().getType() == TurnPhase.POSTCOMBAT_MAIN;
    }

    public boolean isYourNextUpkeepStep(Game game) {
        return (effectStartingOnTurn < game.getTurnNum() ||
                effectStartingStepNum < game.getState().getStepNum())
                && game.isActivePlayer(startingControllerId)
                && game.getStep().getType() == PhaseStep.UPKEEP;
    }

    @Override
    public boolean isInactive(Ability source, Game game) {
        // YOUR turn checks, players who left the game
        // until end of turn - must be checked on cleanup step, see rules 514.2
        // other must checked here (active and leave players), see rules 800.4
        switch (duration) {
            case UntilYourNextTurn:
            case UntilEndOfYourNextTurn:
            case UntilYourNextEndStep:
            case UntilEndCombatOfYourNextTurn:
            case UntilYourNextUpkeepStep:
                break;
            default:
                return false;
        }

        // cheat engine put cards without play and calls direct applyEffects with clean -- need to ignore it
        if (game.getActivePlayerId() == null) {
            return false;
        }

        boolean canDelete;
        Player player = game.getPlayer(startingControllerId);

        // discard on start of turn for leaved player
        // 800.4i When a player leaves the game, any continuous effects with durations that last until that player's next turn
        // or until a specific point in that turn will last until that turn would have begun.
        // They neither expire immediately nor last indefinitely.
        switch (duration) {
            case UntilYourNextTurn:
            case UntilEndOfYourNextTurn:
                canDelete = player == null || (!player.isInGame() && player.hasReachedNextTurnAfterLeaving());
                break;
            default:
                canDelete = false;
        }

        if (canDelete) {
            return true;
        }

        // discard on another conditions (start of your turn)
        switch (duration) {
            case UntilYourNextTurn:
                if (player != null && player.isInGame()) {
                    return this.isYourNextTurn(game);
                }
                break;
            case UntilYourNextEndStep:
                if (player != null && player.isInGame()) {
                    return this.isYourNextEndStep(game);
                }
                break;
            case UntilEndCombatOfYourNextTurn:
                if (player != null && player.isInGame()) {
                    return this.isEndCombatOfYourNextTurn(game);
                }
                break;
            case UntilYourNextUpkeepStep:
                if (player != null && player.isInGame()) {
                    return this.isYourNextUpkeepStep(game);
                }
                break;
        }

        return canDelete;
    }

    @Override
    public Layer getLayer() {
        return layer;
    }

    @Override
    public SubLayer getSublayer() {
        return sublayer;
    }

    @Override
    public List<MageObjectReference> getAffectedObjects() {
        return affectedObjectList;
    }

    /**
     * Returns the status if the effect is temporary added to the
     * ContinuousEffects
     *
     * @return
     */
    @Override
    public boolean isTemporary() {
        return temporary;
    }

    @Override
    public void setTemporary(boolean temporary) {
        this.temporary = temporary;
    }

    public boolean isCharacterDefining() {
        return characterDefining;
    }

    public void setCharacterDefining(boolean characterDefining) {
        this.characterDefining = characterDefining;
    }

    @Override
    public Set<UUID> isDependentTo(List<ContinuousEffect> allEffectsInLayer) {
        Set<UUID> dependentToEffects = new HashSet<>();
        if (dependendToTypes != null) {
            for (ContinuousEffect effect : allEffectsInLayer) {
                if (!effect.getId().equals(this.getId())) {
                    for (DependencyType dependencyType : effect.getDependencyTypes()) {
                        if (dependendToTypes.contains(dependencyType)) {
                            dependentToEffects.add(effect.getId());
                            break;
                        }
                    }
                }
            }
        }
        return dependentToEffects;
    }

    @Override
    public EnumSet<DependencyType> getDependencyTypes() {
        return dependencyTypes;
    }

    @Override
    public EnumSet<DependencyType> getDependedToTypes() {
        return dependendToTypes;
    }

    @Override
    public void addDependencyType(DependencyType dependencyType) {
        if (dependencyType != null) {
            dependencyTypes.add(dependencyType);
        }
    }

    @Override
    public void setDependedToType(DependencyType dependencyType) {
        dependendToTypes.clear();
        dependendToTypes.add(dependencyType);
    }

    @Override
    public void addDependedToType(DependencyType dependencyType) {
        dependendToTypes.add(dependencyType);
    }

    @Override
    public ContinuousEffect setTargetPointer(TargetPointer targetPointer) {
        super.setTargetPointer(targetPointer);
        return this;
    }

    @Override
    public ContinuousEffect withTargetDescription(String target) {
        super.withTargetDescription(target);
        return this;
    }

    /**
     * Auto-generates dependencies on different effects (what's apply first and
     * what's apply second)
     *
     * @param abilityToGain
     * @param filterToSearch
     */
    public void generateGainAbilityDependencies(Ability abilityToGain, Filter filterToSearch) {
        this.addDependencyType(DependencyType.AddingAbility);
        this.generateGainAbilityDependenciesFromAbility(abilityToGain);
        this.generateGainAbilityDependenciesFromFilter(filterToSearch);
    }

    public void generateGainAbilityDependencies(CompoundAbility abilityToGain, Filter filterToSearch) {
        this.addDependencyType(DependencyType.AddingAbility);
        this.generateGainAbilityDependenciesFromAbility(abilityToGain);
        this.generateGainAbilityDependenciesFromFilter(filterToSearch);
    }

    private void generateGainAbilityDependenciesFromAbility(CompoundAbility compoundAbility) {
        if (compoundAbility == null) {
            return;
        }
        for (Ability ability : compoundAbility) {
            generateGainAbilityDependenciesFromAbility(ability);
        }
    }

    private void generateGainAbilityDependenciesFromAbility(Ability ability) {
        if (ability == null) {
            return;
        }

        // 1. "Is all type" ability (changeling)
        // make dependency
        if (ability instanceof ChangelingAbility) {
            this.addDependencyType(DependencyType.AddingCreatureType);
        }
    }

    private void generateGainAbilityDependenciesFromFilter(Filter filter) {
        if (filter == null) {
            return;
        }

        // 1. "Is all type" ability (changeling)
        // wait dependency
        // extraPredicates from some filters is player related, you don't need it here
        List<Predicate> list = new ArrayList<>();
        Predicates.collectAllComponents(filter.getPredicates(), filter.getExtraPredicates(), list);
        if (list.stream().anyMatch(SubType.SubTypePredicate.class::isInstance)) {
            this.addDependedToType(DependencyType.AddingCreatureType);
        }
    }

    public boolean canLookAtNextTopLibraryCard(Game game) {
        // If the top card of your library changes while you’re casting a spell, playing a land, or activating an ability,
        // you can’t look at the new top card until you finish doing so. This means that if you cast the top card of
        // your library, you can’t look at the next one until you’re done paying for that spell. (2019-05-03)
        StackObject stackObject = game.getStack().getFirstOrNull();
        return !(stackObject instanceof Spell)
                || !Zone.LIBRARY.equals(((Spell) stackObject).getFromZone())
                || stackObject.getStackAbility().getManaCostsToPay().isPaid(); // mana payment finished
    }

    @Override
    public ContinuousEffect setText(String staticText) {
        super.setText(staticText);
        return this;
    }
}