/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 de.robv.android.xposed.library.ui;

import android.content.Context;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.preference.Preference;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import de.robv.android.xposed.library.R;

public class ValueSeekBarPreference extends Preference implements OnSeekBarChangeListener {

    private int mProgress;
    private int mStep;
    private int mMin;
    private int mMax;
    private String valueDisplayFormat;
    private boolean mTrackingTouch;
    private TextView tvValue;

    public ValueSeekBarPreference(
            Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        
        if (attrs != null) {
	        setStep(attrs.getAttributeIntValue(null, "step", 1));
	        setMin(attrs.getAttributeIntValue(null, "min", 0));
	        setMax(attrs.getAttributeIntValue(null, "max", 100));
	        valueDisplayFormat = attrs.getAttributeValue(null, "displayFormat");
	        if (valueDisplayFormat == null)
	        	valueDisplayFormat = "%d";
        }
    }

    public ValueSeekBarPreference(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.preferenceStyle);
    }

    public ValueSeekBarPreference(Context context) {
        this(context, null);
    }
    
    @Override
    protected View onCreateView(ViewGroup parent) {
    	ViewGroup originalView = (ViewGroup) super.onCreateView(parent);
    	
        final LayoutInflater layoutInflater =
                (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            
        ViewGroup newlayout = (ViewGroup) layoutInflater.inflate(R.layout.preference_valueseekbar_extension, null);
        newlayout.addView(originalView, 0);
        
        tvValue = (TextView) newlayout.findViewById(R.id.valueseekbar_preference_value);
        
    	return newlayout;
    }

    @Override
    protected void onBindView(View view) {
        super.onBindView(view);
        SeekBar seekBar = (SeekBar) view.findViewById(R.id.valueseekbar_preference_seekbar);
        seekBar.setOnSeekBarChangeListener(this);
        seekBar.setMax((mMax - mMin) / mStep);
        seekBar.setProgress((mProgress - mMin) / mStep);
        tvValue.setText(String.format(valueDisplayFormat, mProgress));
        seekBar.setEnabled(isEnabled());
    }

    @Override
    protected void onSetInitialValue(boolean restoreValue, Object defaultValue) {
        setProgress(restoreValue ? getPersistedInt(mProgress)
                : (Integer) defaultValue);
    }

    @Override
    protected Object onGetDefaultValue(TypedArray a, int index) {
        return a.getInt(index, 0);
    }
    
    public void setStep(int step) {
        if (step != mStep) {
            mStep = step;
            notifyChanged();
        }
    }
    
    public void setMin(int min) {
        if (min != mMin) {
            mMin = min;
            notifyChanged();
        }
    }

    public void setMax(int max) {
        if (max != mMax) {
            mMax = max;
            notifyChanged();
        }
    }

    public void setProgress(int progress) {
        setProgress(progress, true);
    }

    private void setProgress(int progress, boolean notifyChanged) {
        if (progress > mMax) {
            progress = mMax;
        }
        if (progress < mMin) {
            progress = mMin;
        }
        if (progress != mProgress) {
            mProgress = progress;
            persistInt(progress);
            if (notifyChanged) {
                notifyChanged();
            }
        }
    }

    public int getProgress() {
        return mProgress;
    }

    /**
     * Persist the seekBar's progress value if callChangeListener
     * returns true, otherwise set the seekBar's progress to the stored value
     */
    void syncProgress(SeekBar seekBar) {
        int progress = seekBar.getProgress() * mStep + mMin;
        if (progress != mProgress) {
            if (callChangeListener(progress)) {
                setProgress(progress, false);
            } else {
                seekBar.setProgress((mProgress - mMin) / mStep);
            }
        }
    }

    @Override
    public void onProgressChanged(
            SeekBar seekBar, int progress, boolean fromUser) {
        if (fromUser && !mTrackingTouch) {
            syncProgress(seekBar);
        }
        tvValue.setText(String.format(valueDisplayFormat, progress * mStep + mMin));
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        mTrackingTouch = true;
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        mTrackingTouch = false;
        if (seekBar.getProgress() * mStep + mMin != mProgress) {
            syncProgress(seekBar);
        }
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        /*
         * Suppose a client uses this preference type without persisting. We
         * must save the instance state so it is able to, for example, survive
         * orientation changes.
         */

        final Parcelable superState = super.onSaveInstanceState();
        if (isPersistent()) {
            // No need to save instance state since it's persistent
            return superState;
        }

        // Save the instance state
        final SavedState myState = new SavedState(superState);
        myState.progress = mProgress;
        myState.step = mStep;
        myState.min = mMin;
        myState.max = mMax;
        return myState;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (!state.getClass().equals(SavedState.class)) {
            // Didn't save state for us in onSaveInstanceState
            super.onRestoreInstanceState(state);
            return;
        }

        // Restore the instance state
        SavedState myState = (SavedState) state;
        super.onRestoreInstanceState(myState.getSuperState());
        mProgress = myState.progress;
        mStep = myState.step;
        mMin = myState.min;
        mMax = myState.max;
        notifyChanged();
    }

    /**
     * SavedState, a subclass of {@link BaseSavedState}, will store the state
     * of MyPreference, a subclass of Preference.
     * <p>
     * It is important to always call through to super methods.
     */
    private static class SavedState extends BaseSavedState {
        int progress;
        int step;
        int min;
        int max;

        public SavedState(Parcel source) {
            super(source);

            // Restore the click counter
            progress = source.readInt();
            step = source.readInt();
            min = source.readInt();
            max = source.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);

            dest.writeInt(progress);
            dest.writeInt(step);
            dest.writeInt(min);
            dest.writeInt(max);
        }

        public SavedState(Parcelable superState) {
            super(superState);
        }

        @SuppressWarnings("unused")
        public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
}