import datetime
import calendar
from dateutil.relativedelta import relativedelta

def time2date(input):
    chu_ky_thoi_gian = input['CHU KỲ THỜI GIAN']
    thu = input['THỨ']
    ngay = input['NGÀY']
    tuan = input['TUẦN']
    thang = input['THÁNG']
    quy = input['QUÝ']
    nam = input['NĂM']
    
    current_date = datetime.date.today()
    output = 'error'
    if chu_ky_thoi_gian=='ngày':
# hôm kia
        if ngay=='hôm kia':
            output = current_date - datetime.timedelta(days=2)
# hôm qua
        elif ngay=='hôm qua':
            output = current_date - datetime.timedelta(days=1)
# hôm nay
        elif ngay=='hôm nay':
            output = current_date
# ngày mai
        elif ngay=='mai':
            output = current_date + datetime.timedelta(days=1)
# ngày kia
        elif ngay=='kia':
            output = current_date + datetime.timedelta(days=2)
# đầu
        elif ngay=='đầu':
            if thang=='trước':
                needed_thang = 12 if current_date.month==1 else current_date.month-1
                needed_nam = current_date.year-1 if current_date.month==1 else current_date.year
                output = datetime.date(
                    needed_nam,
                    needed_thang,
                    1
                )
            elif thang=='này':
                needed_thang = current_date.month
                needed_nam = current_date.year
                output = datetime.date(
                    needed_nam,
                    needed_thang,
                    1
                )
            elif thang=='sau':
                needed_thang = 1 if current_date.month==12 else current_date.month+1
                needed_nam = current_date.year+1 if current_date.month==12 else current_date.year
                output = datetime.date(
                    needed_nam,
                    needed_thang,
                    1
                )
            else:
                print('ngày đầu')
                output = current_date
# cuối
        elif ngay=='cuối':
            if thang=='trước':
                needed_thang = 12 if current_date.month==1 else current_date.month-1
                needed_nam = current_date.year-1 if current_date.month==1 else current_date.year
                output = datetime.date(
                    needed_nam,
                    needed_thang,
                    calendar.monthrange(needed_nam, needed_thang)[1]
                )
            elif thang=='này':
                needed_thang = current_date.month
                needed_nam = current_date.year
                output = datetime.date(
                    needed_nam,
                    needed_thang,
                    calendar.monthrange(needed_nam, needed_thang)[1]
                )
            elif thang=='sau':
                needed_thang = 1 if current_date.month==12 else current_date.month+1
                needed_nam = current_date.year+1 if current_date.month==12 else current_date.year
                output = datetime.date(
                    needed_nam,
                    needed_thang,
                    calendar.monthrange(needed_nam, needed_thang)[1]
                )
            else:
                print('ngày cuối')
                output = current_date
# xxx
        elif ngay.isdigit():
            ngay = int(ngay)
            if thang.isdigit():
                thang = int(thang)
                if nam.isdigit():
                    nam = int(nam)
                    try:
                        output = datetime.date(nam, thang, ngay)
                    except ValueError:
                        print("ngày xxx tháng yyy nam xxx")
                        output = current_date
                else:
                    try:
                        output = datetime.date(current_date.year, thang, ngay)
                    except ValueError:
                        print("ngày xxx tháng yyy nam xxx")
                        output = current_date
            else:
                try:
                    output = datetime.date(current_date.year, current_date.month, ngay)
                except ValueError:
                    print('ngày xxx')
                    output = current_date
        elif ngay=='khác':
# thứ hai tuần sau
# thứ hai tuần này
# thứ hai tuần trước
# thứ hai tuần gần nhất
# thứ hai
            if thu != "khác":
                if tuan=='khác' or tuan=='gần nhất':
                    current_thu = current_date.weekday()+2
                    input_thu = 8 if thu=='chủ nhật' else int(thu)
                    if input_thu < current_thu:
                        daydelta = current_thu - input_thu
                        output = current_date - datetime.timedelta(days=daydelta)
                    elif input_thu == current_thu:
                        output = current_date - datetime.timedelta(days=7)
                    else:
                        daydelta = input_thu - current_thu
                        output = current_date - datetime.timedelta(days=7-daydelta)
                elif tuan=='này':
                    current_thu = current_date.weekday()+2
                    input_thu = 8 if thu=='chủ nhật' else int(thu)
                    if input_thu < current_thu:
                        daydelta = current_thu - input_thu
                        output = current_date - datetime.timedelta(days=daydelta)
                    elif input_thu == current_thu:
                        output = current_date
                    else:
                        daydelta = input_thu - current_thu
                        output = current_date + datetime.timedelta(days=daydelta)
                elif tuan=='trước':
                    current_thu = current_date.weekday()+2
                    input_thu = 8 if thu=='chủ nhật' else int(thu)
                    if input_thu < current_thu:
                        daydelta = current_thu - input_thu + 7
                        output = current_date - datetime.timedelta(days=daydelta)
                    elif input_thu == current_thu:
                        output = current_date - datetime.timedelta(days=7)
                    else:
                        daydelta = input_thu - current_thu
                        output = current_date - datetime.timedelta(days=7-daydelta)
                elif tuan=='sau':
                    current_thu = current_date.weekday()+2
                    input_thu = 8 if thu=='chủ nhật' else int(thu)
                    if input_thu < current_thu:
                        daydelta = 7 - (current_thu - input_thu)
                        output = current_date + datetime.timedelta(days=daydelta)
                    elif input_thu == current_thu:
                        output = current_date + datetime.timedelta(days=7)
                    else:
                        daydelta = input_thu - current_thu
                        output = current_date + datetime.timedelta(days=7+daydelta)
            elif thu=='khác':
                current_thu = current_date.weekday()
                if tuan=='trước' or tuan=='gần nhất': # ngày cuối tuần
                    daydelta = current_thu+1
                    output = current_date - datetime.timedelta(days=daydelta)
                elif tuan=='này':
                    daydelta = 6 - current_thu
                    if daydelta > 0:
                        output = current_date + datetime.timedelta(days=daydelta)
                    else:
                        output = current_date
                elif tuan=='sau':
                    daydelta = 13 - current_thu
                    output = current_date + datetime.timedelta(days=daydelta)
                else:
                    print('ngày khác thứ khác tuần khác')
                    output = current_date
        else: # return default for ngay
            output = current_date
            print('Error chu ky thoi gian: ngay')

    elif chu_ky_thoi_gian=='tháng': # ngày cuối tháng
        if thu != 'khác' or ngay != 'khác' or tuan != 'khác':
            print('Invalid')
            needed_thang = 12 if current_date.month==1 else current_date.month-1
            needed_nam = current_date.year-1 if current_date.month==1 else current_date.year
            output = datetime.date(
                needed_nam,
                needed_thang,
                calendar.monthrange(needed_nam, needed_thang)[1]
            )

        elif thang=='trước':
            needed_thang = 12 if current_date.month==1 else current_date.month-1
            needed_nam = current_date.year-1 if current_date.month==1 else current_date.year
            output = datetime.date(
                needed_nam,
                needed_thang,
                calendar.monthrange(needed_nam, needed_thang)[1]
            )
        elif thang=='này':
            needed_thang = current_date.month
            needed_nam = current_date.year
            output = datetime.date(
                needed_nam,
                needed_thang,
                calendar.monthrange(needed_nam, needed_thang)[1]
            )
        elif thang=='sau':
            needed_thang = 1 if current_date.month==12 else current_date.month+1
            needed_nam = current_date.year+1 if current_date.month==12 else current_date.year
            output = datetime.date(
                needed_nam,
                needed_thang,
                calendar.monthrange(needed_nam, needed_thang)[1]
            )
        elif thang.isdigit():
            thang = int(thang)
            if nam.isdigit():
                nam = int(nam)
                output = datetime.date(
                    int(nam),
                    int(thang),
                    calendar.monthrange(int(nam), int(thang))[1]
                )
            else:
                if thang > current_date.month:
                    output = datetime.date(
                        current_date.year-1,
                        thang,
                        calendar.monthrange(current_date.year-1, thang)[1]
                    )
                else:
                    output = datetime.date(
                        current_date.year,
                        thang,
                        calendar.monthrange(current_date.year, thang)[1]
                    )
        elif thang=='khác':
            needed_thang = 12 if current_date.month==1 else current_date.month-1
            needed_nam = current_date.year-1 if current_date.month==1 else current_date.year
            output = datetime.date(
                needed_nam,
                needed_thang,
                calendar.monthrange(needed_nam, needed_thang)[1]
            )
        else: # ngay cuoi thang truoc
            needed_thang = 12 if current_date.month==1 else current_date.month-1
            needed_nam = current_date.year-1 if current_date.month==1 else current_date.year
            output = datetime.date(
                needed_nam,
                needed_thang,
                calendar.monthrange(needed_nam, needed_thang)[1]
            )
            print('Error chu ky thoi gian: thang')
    elif chu_ky_thoi_gian=='quý':
        if quy in ['1', '2', '3', '4', 'I', 'II', 'III', 'IV']:
            output = "Valid"
            output = current_date
            # print('Chu ky thoi gian: quy ' + quy)
        else:
            output = "Invalid"
            output = current_date
            # print('Error chu ky thoi gian: quy')
    elif chu_ky_thoi_gian=='năm':
        if nam.isdigit():
            output = "Valid"
            output = current_date
            # print("Chu ky thoi gian: nam " + nam)
        else:
            output = "Invalid"
            output = current_date
            # print('Error chu ky thoi gian: năm')
    elif chu_ky_thoi_gian=='khác':
        output = "Valid"
        output = current_date
    else:
        output = current_date
    return output