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package org.holoeverywhere.app;

import java.util.Calendar;

import org.holoeverywhere.LayoutInflater;
import org.holoeverywhere.R;
import org.holoeverywhere.widget.DatePicker;
import org.holoeverywhere.widget.DatePicker.OnDateChangedListener;

import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.View;

public class DatePickerDialog extends AlertDialog implements OnClickListener,
        OnDateChangedListener {
    public interface OnDateSetListener {
        void onDateSet(DatePicker view, int year, int monthOfYear,
                int dayOfMonth);
    }

    private static final String DAY = "day";
    private static final String MONTH = "month";
    private static final String YEAR = "year";
    private final Calendar mCalendar;
    private final OnDateSetListener mCallBack;
    private final DatePicker mDatePicker;

    private boolean mTitleNeedsUpdate = true;

    public DatePickerDialog(Context context, int theme,
            OnDateSetListener callBack, int year, int monthOfYear,
            int dayOfMonth) {
        super(context, theme);
        mCallBack = callBack;
        mCalendar = Calendar.getInstance();
        setButton(DialogInterface.BUTTON_POSITIVE,
                getContext().getText(R.string.date_time_done), this);
        setButton(DialogInterface.BUTTON_NEGATIVE,
                getContext().getText(android.R.string.cancel), this);
        setIcon(0);
        LayoutInflater inflater = LayoutInflater.from(context);
        View view = inflater.inflate(R.layout.date_picker_dialog, null);
        setView(view);
        mDatePicker = (DatePicker) view.findViewById(R.id.datePicker);
        mDatePicker.init(year, monthOfYear, dayOfMonth, this);
        updateTitle(year, monthOfYear, dayOfMonth);
    }

    public DatePickerDialog(Context context, OnDateSetListener callBack,
            int year, int monthOfYear, int dayOfMonth) {
        this(context, 0, callBack, year, monthOfYear, dayOfMonth);
    }

    public DatePicker getDatePicker() {
        return mDatePicker;
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        if (which == DialogInterface.BUTTON_POSITIVE) {
            tryNotifyDateSet();
        }
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int month, int day) {
        mDatePicker.init(year, month, day, this);
        updateTitle(year, month, day);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        int year = savedInstanceState.getInt(DatePickerDialog.YEAR);
        int month = savedInstanceState.getInt(DatePickerDialog.MONTH);
        int day = savedInstanceState.getInt(DatePickerDialog.DAY);
        mDatePicker.init(year, month, day, this);
    }

    @Override
    public Bundle onSaveInstanceState() {
        Bundle state = super.onSaveInstanceState();
        state.putInt(DatePickerDialog.YEAR, mDatePicker.getYear());
        state.putInt(DatePickerDialog.MONTH, mDatePicker.getMonth());
        state.putInt(DatePickerDialog.DAY, mDatePicker.getDayOfMonth());
        return state;
    }

    private void tryNotifyDateSet() {
        if (mCallBack != null) {
            mDatePicker.clearFocus();
            mCallBack.onDateSet(mDatePicker, mDatePicker.getYear(),
                    mDatePicker.getMonth(), mDatePicker.getDayOfMonth());
        }
    }

    public void updateDate(int year, int monthOfYear, int dayOfMonth) {
        mDatePicker.updateDate(year, monthOfYear, dayOfMonth);
    }

    private void updateTitle(int year, int month, int day) {
        if (!mDatePicker.getCalendarViewShown()) {
            mCalendar.set(Calendar.YEAR, year);
            mCalendar.set(Calendar.MONTH, month);
            mCalendar.set(Calendar.DAY_OF_MONTH, day);
            String title = DateUtils.formatDateTime(getContext(),
                    mCalendar.getTimeInMillis(), DateUtils.FORMAT_SHOW_DATE
                            | DateUtils.FORMAT_SHOW_WEEKDAY
                            | DateUtils.FORMAT_SHOW_YEAR
                            | DateUtils.FORMAT_ABBREV_MONTH
                            | DateUtils.FORMAT_ABBREV_WEEKDAY);
            setTitle(title);
            mTitleNeedsUpdate = true;
        } else {
            if (mTitleNeedsUpdate) {
                mTitleNeedsUpdate = false;
                setTitle(R.string.date_picker_dialog_title);
            }
        }
    }
}