package org.saturnclient.ui.components;

import org.saturnclient.config.Theme;
import org.saturnclient.ui.Element;
import org.saturnclient.ui.ElementContext;
import org.saturnclient.ui.RenderScope;
import org.saturnclient.ui.resources.Fonts;

/**
 * The player, wearing their cosmetics, filling the element. Dragging it turns
 * the player around.
 */
public class SkinPreview extends Element {
    public static EntityDrawer DRAWER;

    /** Degrees turned per GUI pixel dragged */
    private static final float DRAG_SPEED = 1.2f;
    private static final float HINT_SCALE = 0.66f;

    private float yaw;
    private boolean dragging = false;

    /**
     * @param yaw degrees the player starts turned by: 0 faces the viewer, 180
     *            shows their back
     */
    public SkinPreview(float yaw) {
        this.yaw = yaw;
    }

    @Override
    public void render(RenderScope renderScope, ElementContext ctx) {
        if (DRAWER != null && DRAWER.render(renderScope, width, height, yaw)) {
            return;
        }

        String hint = "Join a world to preview";
        int x = (width - (int) (Fonts.getWidth(hint, Theme.getBodyFont()) * HINT_SCALE)) / 2;
        renderScope.drawText(HINT_SCALE, hint, x, height / 2, Theme.getBodyFont(), Theme.getMutedFg());
    }

    @Override
    public void mouseClicked(double mouseX, double mouseY, int button) {
        dragging = mouseX >= 0 && mouseX <= width && mouseY >= 0 && mouseY <= height;
    }

    @Override
    public void mouseDragged(double mouseX, double mouseY, int button, double deltaX, double deltaY) {
        if (dragging) {
            yaw = (yaw - (float) deltaX * DRAG_SPEED) % 360;
        }
    }

    @Override
    public void mouseReleased(double mouseX, double mouseY, int button) {
        dragging = false;
    }

    public static interface EntityDrawer {
        /**
         * Draws the client's player filling a {@code width} x {@code height} box,
         * turned by {@code yaw} degrees (0 faces the viewer).
         *
         * @return false if there's no player to draw, such as on the title screen
         */
        public boolean render(RenderScope renderScope, int width, int height, float yaw);
    }
}