package hw.micode.widget;

import java.text.DateFormatSymbols;
import java.util.Calendar;

import net.micode.notes.R;


import android.content.Context;
import android.text.format.DateFormat;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.NumberPicker;

public class DateTimePicker extends FrameLayout {
	
	private static final boolean DEFAULT_ENABLE_STATE = true;
	
	private static final int HOURS_IN_HALF_DAY = 12;
	private static final int HOURS_IN_ALL_DAY = 24;
	private static final int DAYS_IN_ALL_WEEK = 7;
	
	private final int WIDTH_DATE_SPINNER_24_HOURVIEW;
	private final int WIDTH_HOUR_SPINNER_24_HOURVIEW;
	private final int WIDTH_MINUTE_SPINNER_24_HOURVIEW;
	private final int WIDTH_DATE_SPINNER_12_HOURVIEW;
	private final int WIDTH_HOUR_SPINNER_12_HOURVIEW;
	private final int WIDTH_MINUTE_SPINNER_12_HOURVIEW;
	
	private final NumberPicker mDateSpinner;
	private final NumberPicker mHourSpinner;
	private final NumberPicker mMinuteSpinner;
	private final NumberPicker mAmPmSpinner;
	private Calendar mDate;
	
	private String[] mDateDisplayValues = new String[DAYS_IN_ALL_WEEK];
	
	private boolean mIsAm;

	private boolean mIs24HourView;
	
	private boolean mIsEnabled = DEFAULT_ENABLE_STATE;
	
	private boolean mInitialising;
	
	private OnDateTimeChangedListener mOnDateTimeChangedListener;
	
	private NumberPicker.OnValueChangeListener mOnPickerValueChangedListener = new NumberPicker.OnValueChangeListener() {
		public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
			if (picker == mDateSpinner) {
				mDate.add(Calendar.DAY_OF_YEAR, newVal - oldVal);
				updateDateControl();
				onDateTimeChanged();
			} else if (picker == mHourSpinner) {
				boolean isDateChanged = false;
				Calendar cal = Calendar.getInstance();
				if (!mIs24HourView) {
					if (!mIsAm && oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY) {
						cal.setTimeInMillis(mDate.getTimeInMillis());
						cal.add(Calendar.DAY_OF_YEAR, 1);
						isDateChanged = true;
					} else if (mIsAm && oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
						cal.setTimeInMillis(mDate.getTimeInMillis());
						cal.add(Calendar.DAY_OF_YEAR, -1);
						isDateChanged = true;
					}
					if (oldVal == HOURS_IN_HALF_DAY - 1 && newVal == HOURS_IN_HALF_DAY ||
							oldVal == HOURS_IN_HALF_DAY && newVal == HOURS_IN_HALF_DAY - 1) {
						mIsAm = !mIsAm;
						updateAmPmControl();
					}
				} else {
					if (oldVal == HOURS_IN_ALL_DAY - 1 && newVal == 0) {
						cal.setTimeInMillis(mDate.getTimeInMillis());
						cal.add(Calendar.DAY_OF_YEAR, 1);
						isDateChanged = true;
					} else if (oldVal == 0 && newVal == HOURS_IN_ALL_DAY - 1) {
						cal.setTimeInMillis(mDate.getTimeInMillis());
						cal.add(Calendar.DAY_OF_YEAR, -1);
						isDateChanged = true;
					}
				}
				int newHour = mHourSpinner.getValue() % HOURS_IN_HALF_DAY + (mIsAm ? 0 : HOURS_IN_HALF_DAY);
				mDate.set(Calendar.HOUR_OF_DAY, newHour);
				onDateTimeChanged();
				if (isDateChanged) {
					setCurrentYear(cal.get(Calendar.YEAR));
					setCurrentMonth(cal.get(Calendar.MONTH));
					setCurrentDay(cal.get(Calendar.DAY_OF_MONTH));
				}
			} else if (picker == mMinuteSpinner) {
				int minValue = mMinuteSpinner.getMinValue();
				int maxValue = mMinuteSpinner.getMaxValue();
				int offset = 0;
				if (oldVal == maxValue && newVal == minValue) {
					offset += 1;
				} else if (oldVal == minValue && newVal == maxValue) {
					offset -= 1;
				}
				if (offset != 0) {
					mDate.add(Calendar.HOUR_OF_DAY, offset);
					mHourSpinner.setValue(getCurrentHour());
					updateDateControl();
					int newHour = getCurrentHourOfDay();
					if (newHour >= HOURS_IN_HALF_DAY) {
						mIsAm = false;
						updateAmPmControl();
					} else {
						mIsAm = true;
						updateAmPmControl();
					}
				}
				mDate.set(Calendar.MINUTE, newVal);
				onDateTimeChanged();
			} else if (picker == mAmPmSpinner) {
				mIsAm = !mIsAm;
				if (mIsAm) {
					mDate.add(Calendar.HOUR_OF_DAY, -HOURS_IN_HALF_DAY);
				} else {
					mDate.add(Calendar.HOUR_OF_DAY, HOURS_IN_HALF_DAY);
				}
				updateAmPmControl();
				onDateTimeChanged();
			}
		}
	};
	
	public interface OnDateTimeChangedListener {
		void onDateTimeChanged(DateTimePicker view, int year, int month,
				int dayOfMonth, int hourOfDay, int minute);
	}
	
	public DateTimePicker(Context context) {
		this(context, System.currentTimeMillis());
	}
	
	public DateTimePicker(Context context, long date) {
		this(context, date, DateFormat.is24HourFormat(context));
	}
	
	public DateTimePicker(Context context, long date, boolean is24HourView) {
		super(context);
		mDate = Calendar.getInstance();
        mInitialising = true;
		mIsAm = getCurrentHourOfDay() >= HOURS_IN_HALF_DAY;
		inflate(context, R.layout.datetime_picker, this);
		
		WIDTH_DATE_SPINNER_24_HOURVIEW = getResources().getDimensionPixelSize(R.dimen.width_date_spinner_24_hourview);
		WIDTH_DATE_SPINNER_12_HOURVIEW = getResources().getDimensionPixelSize(R.dimen.width_date_spinner_12_houwview);
		WIDTH_HOUR_SPINNER_24_HOURVIEW = getResources().getDimensionPixelSize(R.dimen.width_hour_spinner_24_hourview);
		WIDTH_HOUR_SPINNER_12_HOURVIEW = getResources().getDimensionPixelSize(R.dimen.width_hour_spinner_12_hourview);
		WIDTH_MINUTE_SPINNER_24_HOURVIEW = getResources().getDimensionPixelSize(R.dimen.width_hour_spinner_24_hourview);
		WIDTH_MINUTE_SPINNER_12_HOURVIEW = getResources().getDimensionPixelSize(R.dimen.width_hour_spinner_12_hourview);
		
		mDateSpinner = (NumberPicker) findViewById(R.id.date);
		mDateSpinner.setMinValue(0);
		mDateSpinner.setMaxValue(6);
		mDateSpinner.setOnValueChangedListener(mOnPickerValueChangedListener);
		
		mHourSpinner = (NumberPicker) findViewById(R.id.hour);
		mHourSpinner.setOnValueChangedListener(mOnPickerValueChangedListener);
		mMinuteSpinner =  (NumberPicker) findViewById(R.id.minute);
		mMinuteSpinner.setMinValue(0);
		mMinuteSpinner.setMaxValue(59);
        mMinuteSpinner.setOnLongPressUpdateInterval(100);
		mMinuteSpinner.setOnValueChangedListener(mOnPickerValueChangedListener);
		
        String[] stringsForAmPm = new DateFormatSymbols().getAmPmStrings(); 
		mAmPmSpinner = (NumberPicker) findViewById(R.id.amPm);
		mAmPmSpinner.setMinValue(0);
		mAmPmSpinner.setMaxValue(1);
		mAmPmSpinner.setDisplayedValues(stringsForAmPm);
		mAmPmSpinner.setOnValueChangedListener(mOnPickerValueChangedListener);

        // update controls to initial state
		updateDateControl();
        updateHourControl();
        updateAmPmControl();
        
        set24HourView(is24HourView);

        // set to current time
        setCurrentDate(date);

        if (!isEnabled()) {
            setEnabled(false);
        }

        // set the content descriptions
        mInitialising = false;
	}
	
	@Override
	public void setEnabled(boolean enabled) {
		if (mIsEnabled == enabled) {
			return;
		}
		super.setEnabled(enabled);
		mDateSpinner.setEnabled(enabled);
		mMinuteSpinner.setEnabled(enabled);
		mHourSpinner.setEnabled(enabled);
		mAmPmSpinner.setEnabled(enabled);
		mIsEnabled = enabled;
	}
	
	@Override
	public boolean isEnabled() {
		return mIsEnabled;
	}
	
	public long getCurrentDateInTimeMillis() {
		return mDate.getTimeInMillis();
	}
	
	public void setCurrentDate(long date) {
		Calendar cal = Calendar.getInstance();
		cal.setTimeInMillis(date);
		setCurrentDate(cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH),
				cal.get(Calendar.HOUR_OF_DAY), cal.get(Calendar.MINUTE));
	}
	
	public void setCurrentDate(int year, int month,
			int dayOfMonth, int hourOfDay, int minute) {
		setCurrentYear(year);
		setCurrentMonth(month);
		setCurrentDay(dayOfMonth);
		setCurrentHour(hourOfDay);
		setCurrentMinute(minute);
	}
	
	public int getCurrentYear() {
		return mDate.get(Calendar.YEAR);
	}
	
	public void setCurrentYear(int year) {
		if (!mInitialising && year == getCurrentYear()) {
			return;
		}
		mDate.set(Calendar.YEAR, year);
		updateDateControl();
		onDateTimeChanged();
	}
	
	public int getCurrentMonth() {
		return mDate.get(Calendar.MONTH);
	}
	
	public void setCurrentMonth(int month) {
		if (!mInitialising && month == getCurrentMonth()) {
			return;
		}
		mDate.set(Calendar.MONTH, month);
		updateDateControl();
		onDateTimeChanged();
	}
	
	public int getCurrentDay() {
		return mDate.get(Calendar.DAY_OF_MONTH);
	}
	
	public void setCurrentDay(int dayOfMonth) {
		if (!mInitialising && dayOfMonth == getCurrentDay()) {
			return;
		}
		mDate.set(Calendar.DAY_OF_MONTH, dayOfMonth);
		updateDateControl();
		onDateTimeChanged();
	}
	
	public int getCurrentHourOfDay() {
		return mDate.get(Calendar.HOUR_OF_DAY);
	}
	
	public int getCurrentHour() {
		if (mIs24HourView){
			return getCurrentHourOfDay();
		} else {
			int hour = getCurrentHourOfDay();
			if (hour > HOURS_IN_HALF_DAY) {
				return hour - HOURS_IN_HALF_DAY;
			} else {
				return hour == 0 ? HOURS_IN_HALF_DAY : hour;
			}
		}
	}
	
	public void setCurrentHour(int hourOfDay) {
		if (!mInitialising && hourOfDay == getCurrentHourOfDay()) {
			return;
		}
		mDate.set(Calendar.HOUR_OF_DAY, hourOfDay);
		if (!mIs24HourView) {
			if (hourOfDay >= HOURS_IN_HALF_DAY) {
				mIsAm = false;
				if (hourOfDay > HOURS_IN_HALF_DAY) {
					hourOfDay -= HOURS_IN_HALF_DAY;
				}
			} else {
				mIsAm = true;
				if (hourOfDay == 0) {
					hourOfDay = HOURS_IN_HALF_DAY;
				}
			}
			updateAmPmControl();
		}
		mHourSpinner.setValue(hourOfDay);
		onDateTimeChanged();
	}
	
	public int getCurrentMinute() {
		return mDate.get(Calendar.MINUTE);
	}
	
	public void setCurrentMinute(int minute) {
		if (!mInitialising && minute == getCurrentMinute()) {
			return;
		}
		mMinuteSpinner.setValue(minute);
		mDate.set(Calendar.MINUTE, minute);
		onDateTimeChanged();
	}
	
	public boolean is24HourView () {
		return mIs24HourView;
	}
	
	public void set24HourView(boolean is24HourView) {
		if (mIs24HourView == is24HourView) {
			return;
		}
		mIs24HourView = is24HourView;
		if (is24HourView) {
			mDateSpinner.setLayoutParams(
					new LinearLayout.LayoutParams(WIDTH_DATE_SPINNER_24_HOURVIEW, LinearLayout.LayoutParams.WRAP_CONTENT));
			mHourSpinner.setLayoutParams(
					new LinearLayout.LayoutParams(WIDTH_HOUR_SPINNER_24_HOURVIEW, LinearLayout.LayoutParams.WRAP_CONTENT));
			mMinuteSpinner.setLayoutParams(
					new LinearLayout.LayoutParams(WIDTH_MINUTE_SPINNER_24_HOURVIEW, LinearLayout.LayoutParams.WRAP_CONTENT));
		} else {
			mDateSpinner.setLayoutParams(
					new LinearLayout.LayoutParams(WIDTH_DATE_SPINNER_12_HOURVIEW, LinearLayout.LayoutParams.WRAP_CONTENT));
			mHourSpinner.setLayoutParams(
					new LinearLayout.LayoutParams(WIDTH_HOUR_SPINNER_12_HOURVIEW, LinearLayout.LayoutParams.WRAP_CONTENT));
			mMinuteSpinner.setLayoutParams(
					new LinearLayout.LayoutParams(WIDTH_MINUTE_SPINNER_12_HOURVIEW, LinearLayout.LayoutParams.WRAP_CONTENT));
		}
		int hour = getCurrentHourOfDay();
		updateHourControl();
		setCurrentHour(hour);
		updateAmPmControl();
	}
	
	private void updateDateControl() {
		Calendar cal = Calendar.getInstance();
		cal.setTimeInMillis(mDate.getTimeInMillis());
		cal.add(Calendar.DAY_OF_YEAR, -DAYS_IN_ALL_WEEK / 2 - 1);
		mDateSpinner.setDisplayedValues(null);
		for (int i = 0; i < DAYS_IN_ALL_WEEK; ++i) {
			cal.add(Calendar.DAY_OF_YEAR, 1);
			mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE", cal);
		}
		mDateSpinner.setDisplayedValues(mDateDisplayValues);
		mDateSpinner.setValue(DAYS_IN_ALL_WEEK / 2);
		mDateSpinner.invalidate();
	}
	
	private void updateAmPmControl() {
		if (mIs24HourView) {
			mAmPmSpinner.setVisibility(View.GONE);
		} else {
			int index = mIsAm ? Calendar.AM : Calendar.PM;
			mAmPmSpinner.setValue(index);
			mAmPmSpinner.setVisibility(View.VISIBLE);
		}
	}
	
	private void updateHourControl() {
		if (mIs24HourView) {
			mHourSpinner.setMinValue(0);
			mHourSpinner.setMaxValue(23);
		} else {
			mHourSpinner.setMinValue(1);
			mHourSpinner.setMaxValue(12);
		}
	}
	
	public void setOnDateTimeChangedListener(OnDateTimeChangedListener callback) {
		mOnDateTimeChangedListener = callback;
	}
	
	private void onDateTimeChanged() {
		if (mOnDateTimeChangedListener != null) {
			mOnDateTimeChangedListener.onDateTimeChanged(this, getCurrentYear(),
					getCurrentMonth(), getCurrentDay(), getCurrentHourOfDay(), getCurrentMinute());
		}
	}
}