/*******************************************************************************
 * Copyright 2014 Rafael Garcia Moreno.
 *
 * 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 com.bladecoder.engine.anim;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Json;
import com.badlogic.gdx.utils.JsonValue;
import com.bladecoder.engine.actions.ActionCallback;
import com.bladecoder.engine.model.SceneCamera;
import com.bladecoder.engine.util.InterpolationMode;

/**
 * Tween for camera position and zoom animation
 */
public class CameraTween extends Tween<SceneCamera> {

    private float startX, startY, startZoom;
    private float targetX, targetY, targetZoom;

    public CameraTween() {
    }

    public void start(SceneCamera camera, Tween.Type repeatType, int count, float targetX, float targetY,
                      float targetZoom, float duration, InterpolationMode interpolation, ActionCallback cb) {

        this.target = camera;

        Vector2 currentPos = camera.getPosition();

        startX = currentPos.x;
        startY = currentPos.y;
        startZoom = camera.getZoom();
        this.targetX = targetX;
        this.targetY = targetY;
        this.targetZoom = targetZoom;

        setDuration(duration);
        setType(repeatType);
        setCount(count);
        setInterpolation(interpolation);

        if (cb != null) {
            setCb(cb);
        }
    }

    @Override
    public void updateTarget() {
        target.setZoom(startZoom + getPercent() * (targetZoom - startZoom));
        target.setPosition(startX + getPercent() * (targetX - startX),
                startY + getPercent() * (targetY - startY));
    }

    @Override
    public void write(Json json) {
        super.write(json);

        json.writeValue("startX", startX);
        json.writeValue("startY", startY);
        json.writeValue("startZoom", startZoom);
        json.writeValue("targetX", targetX);
        json.writeValue("targetY", targetY);
        json.writeValue("targetZoom", targetZoom);
    }

    @Override
    public void read(Json json, JsonValue jsonData) {
        super.read(json, jsonData);

        startX = json.readValue("startX", Float.class, jsonData);
        startY = json.readValue("startY", Float.class, jsonData);
        startZoom = json.readValue("startZoom", Float.class, jsonData);
        targetX = json.readValue("targetX", Float.class, jsonData);
        targetY = json.readValue("targetY", Float.class, jsonData);
        targetZoom = json.readValue("targetZoom", Float.class, jsonData);
    }
}
