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/*
 * Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.dv8tion.jda.internal.requests;

import net.dv8tion.jda.api.JDA;
import net.dv8tion.jda.api.exceptions.RateLimitedException;
import net.dv8tion.jda.api.requests.RestAction;
import net.dv8tion.jda.api.requests.restaction.AuditableRestAction;
import net.dv8tion.jda.api.requests.restaction.CacheRestAction;
import net.dv8tion.jda.internal.utils.Checks;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.function.BooleanSupplier;
import java.util.function.Consumer;
import java.util.function.Supplier;

public class DeferredRestAction> implements AuditableRestAction, CacheRestAction
{
    private final JDA api;
    private final Class type;
    private final Supplier valueSupplier;
    private final Supplier actionSupplier;

    private boolean useCache = true;
    private String reason;
    private long deadline = -1;
    private BooleanSupplier isAction;
    private BooleanSupplier transitiveChecks;

    public DeferredRestAction(JDA api, Supplier actionSupplier)
    {
        this(api, null, null, actionSupplier);
    }

    public DeferredRestAction(JDA api, Class type,
                              Supplier valueSupplier,
                              Supplier actionSupplier)
    {
        this.api = api;
        this.type = type;
        this.valueSupplier = valueSupplier;
        this.actionSupplier = actionSupplier;
    }

    @Nonnull
    @Override
    public JDA getJDA()
    {
        return api;
    }

    @Nonnull
    @Override
    public AuditableRestAction reason(String reason)
    {
        this.reason = reason;
        return this;
    }

    @Nonnull
    @Override
    public DeferredRestAction setCheck(BooleanSupplier checks)
    {
        this.transitiveChecks = checks;
        return this;
    }

    @Nullable
    @Override
    public BooleanSupplier getCheck()
    {
        return transitiveChecks;
    }

    @Nonnull
    @Override
    public DeferredRestAction timeout(long timeout, @Nonnull TimeUnit unit)
    {
        Checks.notNull(unit, "TimeUnit");
        return deadline(timeout <= 0 ? 0 : System.currentTimeMillis() + unit.toMillis(timeout));
    }

    @Nonnull
    @Override
    public DeferredRestAction deadline(long timestamp)
    {
        this.deadline = timestamp;
        return this;
    }

    @Nonnull
    @Override
    public CacheRestAction useCache(boolean useCache)
    {
        this.useCache = useCache;
        return this;
    }

    public AuditableRestAction setCacheCheck(BooleanSupplier checks)
    {
        this.isAction = checks;
        return this;
    }

    @Override
    public void queue(Consumer success, Consumer failure)
    {
        Consumer finalSuccess;
        if (success != null)
            finalSuccess = success;
        else
            finalSuccess = RestAction.getDefaultSuccess();

        if (type == null)
        {
            BooleanSupplier checks = this.isAction;
            if (checks != null && checks.getAsBoolean())
                getAction().queue(success, failure);
            else
                finalSuccess.accept(null);
            return;
        }

        T value = valueSupplier.get();
        if (!useCache || value == null)
        {
            getAction().queue(success, failure);
        }
        else
        {
            finalSuccess.accept(value);
        }
    }

    @Nonnull
    @Override
    public CompletableFuture submit(boolean shouldQueue)
    {
        if (type == null)
        {
            BooleanSupplier checks = this.isAction;
            if (checks != null && checks.getAsBoolean())
                return getAction().submit(shouldQueue);
            return CompletableFuture.completedFuture(null);
        }
        T value = valueSupplier.get();
        if (useCache && value != null)
            return CompletableFuture.completedFuture(value);
        return getAction().submit(shouldQueue);
    }

    @Override
    public T complete(boolean shouldQueue) throws RateLimitedException
    {
        if (type == null)
        {
            BooleanSupplier checks = this.isAction;
            if (checks != null && checks.getAsBoolean())
                return getAction().complete(shouldQueue);
            return null;
        }
        T value = valueSupplier.get();
        if (useCache && value != null)
            return value;
        return getAction().complete(shouldQueue);
    }

    private R getAction()
    {
        R action = actionSupplier.get();
        action.setCheck(transitiveChecks);
        if (deadline >= 0)
            action.deadline(deadline);
        if (action instanceof AuditableRestAction && reason != null)
            ((AuditableRestAction) action).reason(reason);
        return action;
    }
}