/*
 * Copyright © 2019 LambdAurora <aurora42lambda@gmail.com>
 *
 * This file is part of LambdaControls.
 *
 * Licensed under the MIT license. For more information,
 * see the LICENSE file.
 */

package me.lambdaurora.lambdacontrols.gui;

import com.mojang.blaze3d.platform.GlStateManager;
import com.mojang.blaze3d.systems.RenderSystem;
import net.minecraft.client.MinecraftClient;
import net.minecraft.client.gui.widget.ButtonWidget;
import net.minecraft.util.math.MathHelper;
import org.jetbrains.annotations.NotNull;

/**
 * Represents a button with an icon instead of text.
 */
public abstract class AbstractIconButtonWidget extends ButtonWidget
{
    private int icon_size = 0;

    public AbstractIconButtonWidget(int x, int y, int width, int height, @NotNull String message, @NotNull PressAction on_press)
    {
        super(x, y, width, height, message, on_press);
    }

    protected abstract int render_icon(int mouse_x, int mouse_y, float delta, int x, int y);

    @Override
    public void renderButton(int mouse_x, int mouse_y, float delta)
    {
        MinecraftClient client = MinecraftClient.getInstance();
        client.getTextureManager().bindTexture(WIDGETS_LOCATION);
        RenderSystem.color4f(1.0F, 1.0F, 1.0F, this.alpha);
        int i = this.getYImage(this.isHovered());
        RenderSystem.enableBlend();
        RenderSystem.defaultBlendFunc();
        RenderSystem.blendFunc(GlStateManager.SrcFactor.SRC_ALPHA, GlStateManager.DstFactor.ONE_MINUS_SRC_ALPHA);
        this.blit(this.x, this.y, 0, 46 + i * 20, this.width / 2, this.height);
        this.blit(this.x + this.width / 2, this.y, 200 - this.width / 2, 46 + i * 20, this.width / 2, this.height);
        this.renderBg(client, mouse_x, mouse_y);

        this.icon_size = this.render_icon(mouse_x, mouse_y, delta, this.x + 4, this.y + (this.height / 2 - this.icon_size / 2));

        if (!this.getMessage().isEmpty()) {
            int j = this.active ? 16777215 : 10526880;
            this.drawCenteredString(client.textRenderer, this.getMessage(), this.x + 8 + this.icon_size + (this.width - 8 - this.icon_size - 6) / 2,
                    this.y + (this.height - 8) / 2, j | MathHelper.ceil(this.alpha * 255.0F) << 24);
        }
    }
}