package me.ecois.lite.ui.fragment;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.DatePicker;

import java.util.Calendar;

import me.ecois.lite.R;


public class MonthPickerDialog extends AlertDialog implements DialogInterface.OnClickListener, DatePicker.OnDateChangedListener {

    private static final String YEAR = "year";
    private static final String MONTH = "month";
    private static final String DAY = "day";

    private final DatePicker mDatePicker;
    private final OnMonthSelectedListener mMonthSetListener;
    private final Calendar mCalendar;


    public interface OnMonthSelectedListener {
        void onMonthSet(int year, int monthOfYear);
    }

    public MonthPickerDialog(Context context,
                             OnMonthSelectedListener callBack,
                             int year,
                             int monthOfYear) {
        this(context, 0, callBack, year, monthOfYear);
    }

    static int resolveDialogTheme(Context context, int resId) {
        if (resId == 0 && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            final TypedValue outValue = new TypedValue();
            context.getTheme().resolveAttribute(android.R.attr.datePickerDialogTheme, outValue, true);
            return outValue.resourceId;
        } else {
            return resId;
        }
    }

    public MonthPickerDialog(Context context, int theme, OnMonthSelectedListener listener, int year,
                             int monthOfYear) {
        super(context, resolveDialogTheme(context, theme));

        mMonthSetListener = listener;
        mCalendar = Calendar.getInstance();

        final Context themeContext = getContext();
        final LayoutInflater inflater = LayoutInflater.from(themeContext);
        final View view = inflater.inflate(R.layout.month_picker_dialog, null);
        setView(view);
        setButton(BUTTON_POSITIVE, themeContext.getString(android.R.string.ok), this);
        setButton(BUTTON_NEGATIVE, themeContext.getString(android.R.string.cancel), this);

        mDatePicker = (DatePicker) view.findViewById(R.id.datePicker);
        mDatePicker.findViewById(Resources.getSystem().getIdentifier("day", "id", "android")).setVisibility(View.GONE);
        mDatePicker.init(year, monthOfYear, 1, this);

        updateTitle(year, monthOfYear);
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int month, int day) {
        mDatePicker.init(year, month, 1, this);
        updateTitle(year, month);
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
            case BUTTON_POSITIVE:
                if (mMonthSetListener != null) {
                    mDatePicker.clearFocus();
                    mMonthSetListener.onMonthSet(mDatePicker.getYear(), mDatePicker.getMonth());
                }
                break;
            case BUTTON_NEGATIVE:
                cancel();
                break;
        }
    }

    public DatePicker getDatePicker() {
        return mDatePicker;
    }

    public void updateDate(int year, int monthOfYear) {
        mDatePicker.updateDate(year, monthOfYear, 1);
    }

    private void updateTitle(int year, int month) {
        mCalendar.set(Calendar.YEAR, year);
        mCalendar.set(Calendar.MONTH, month);
        String title = DateUtils.formatDateTime(getContext(),
                mCalendar.getTimeInMillis(),
                DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_NO_MONTH_DAY);
        setTitle(title);
    }

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

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