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import re
import datetime
import time

from constants import FIELD_TYPE, FLAG
from charset import charset_by_id

try:
    set
except NameError:
    try:
        from sets import BaseSet as set
    except ImportError:
        from sets import Set as set

ESCAPE_REGEX = re.compile(r"[\0\n\r\032\'\"\\]")
ESCAPE_MAP = {'\0': '\\0', '\n': '\\n', '\r': '\\r', '\032': '\\Z',
              '\'': '\\\'', '"': '\\"', '\\': '\\\\'}

def escape_item(val, charset):
    if type(val) in [tuple, list, set]:
        return escape_sequence(val, charset)
    if type(val) is dict:
        return escape_dict(val, charset)
    if hasattr(val, "decode") and not isinstance(val, unicode):
        # deal with py3k bytes
        val = val.decode(charset)
    encoder = encoders[type(val)]
    val = encoder(val)
    if type(val) is str:
        return val
    val = val.encode(charset)
    return val

def escape_dict(val, charset):
    n = {}
    for k, v in val.items():
        quoted = escape_item(v, charset)
        n[k] = quoted
    return n

def escape_sequence(val, charset):
    n = []
    for item in val:
        quoted = escape_item(item, charset)
        n.append(quoted)
    return tuple(n)

def escape_set(val, charset):
    val = map(lambda x: escape_item(x, charset), val)
    return ','.join(val)

def escape_bool(value):
    return str(int(value))

def escape_object(value):
    return str(value)

escape_int = escape_long = escape_object

def escape_float(value):
    return ('%.15g' % value)

def escape_string(value):
    return ("'%s'" % ESCAPE_REGEX.sub(
            lambda match: ESCAPE_MAP.get(match.group(0)), value))

def escape_unicode(value):
    return escape_string(value)

def escape_None(value):
    return 'NULL'

def escape_timedelta(obj):
    seconds = int(obj.seconds) % 60
    minutes = int(obj.seconds // 60) % 60
    hours = int(obj.seconds // 3600) % 24 + int(obj.days) * 24
    return escape_string('%02d:%02d:%02d' % (hours, minutes, seconds))

def escape_time(obj):
    s = "%02d:%02d:%02d" % (int(obj.hour), int(obj.minute),
                            int(obj.second))
    if obj.microsecond:
        s += ".%f" % obj.microsecond

    return escape_string(s)

def escape_datetime(obj):
    return escape_string(obj.strftime("%Y-%m-%d %H:%M:%S"))

def escape_date(obj):
    return escape_string(obj.strftime("%Y-%m-%d"))

def escape_struct_time(obj):
    return escape_datetime(datetime.datetime(*obj[:6]))

def convert_datetime(connection, field, obj):
    """Returns a DATETIME or TIMESTAMP column value as a datetime object:

      >>> datetime_or_None('2007-02-25 23:06:20')
      datetime.datetime(2007, 2, 25, 23, 6, 20)
      >>> datetime_or_None('2007-02-25T23:06:20')
      datetime.datetime(2007, 2, 25, 23, 6, 20)

    Illegal values are returned as None:

      >>> datetime_or_None('2007-02-31T23:06:20') is None
      True
      >>> datetime_or_None('0000-00-00 00:00:00') is None
      True

    """
    if not isinstance(obj, unicode):
        obj = obj.decode(connection.charset)
    if ' ' in obj:
        sep = ' '
    elif 'T' in obj:
        sep = 'T'
    else:
        return convert_date(connection, field, obj)

    try:
        ymd, hms = obj.split(sep, 1)
        return datetime.datetime(*[ int(x) for x in ymd.split('-')+hms.split(':') ])
    except ValueError:
        return convert_date(connection, field, obj)

def convert_timedelta(connection, field, obj):
    """Returns a TIME column as a timedelta object:

      >>> timedelta_or_None('25:06:17')
      datetime.timedelta(1, 3977)
      >>> timedelta_or_None('-25:06:17')
      datetime.timedelta(-2, 83177)

    Illegal values are returned as None:

      >>> timedelta_or_None('random crap') is None
      True

    Note that MySQL always returns TIME columns as (+|-)HH:MM:SS, but
    can accept values as (+|-)DD HH:MM:SS. The latter format will not
    be parsed correctly by this function.
    """
    from math import modf
    try:
        if not isinstance(obj, unicode):
            obj = obj.decode(connection.charset)
        hours, minutes, seconds = tuple([int(x) for x in obj.split(':')])
        tdelta = datetime.timedelta(
            hours = int(hours),
            minutes = int(minutes),
            seconds = int(seconds),
            microseconds = int(modf(float(seconds))[0]*1000000),
            )
        return tdelta
    except ValueError:
        return None

def convert_time(connection, field, obj):
    """Returns a TIME column as a time object:

      >>> time_or_None('15:06:17')
      datetime.time(15, 6, 17)

    Illegal values are returned as None:

      >>> time_or_None('-25:06:17') is None
      True
      >>> time_or_None('random crap') is None
      True

    Note that MySQL always returns TIME columns as (+|-)HH:MM:SS, but
    can accept values as (+|-)DD HH:MM:SS. The latter format will not
    be parsed correctly by this function.

    Also note that MySQL's TIME column corresponds more closely to
    Python's timedelta and not time. However if you want TIME columns
    to be treated as time-of-day and not a time offset, then you can
    use set this function as the converter for FIELD_TYPE.TIME.
    """
    from math import modf
    try:
        hour, minute, second = obj.split(':')
        return datetime.time(hour=int(hour), minute=int(minute),
                             second=int(second),
                             microsecond=int(modf(float(second))[0]*1000000))
    except ValueError:
        return None

def convert_date(connection, field, obj):
    """Returns a DATE column as a date object:

      >>> date_or_None('2007-02-26')
      datetime.date(2007, 2, 26)

    Illegal values are returned as None:

      >>> date_or_None('2007-02-31') is None
      True
      >>> date_or_None('0000-00-00') is None
      True

    """
    try:
        if not isinstance(obj, unicode):
            obj = obj.decode(connection.charset)
        return datetime.date(*[ int(x) for x in obj.split('-', 2) ])
    except ValueError:
        return None

def convert_mysql_timestamp(connection, field, timestamp):
    """Convert a MySQL TIMESTAMP to a Timestamp object.

    MySQL >= 4.1 returns TIMESTAMP in the same format as DATETIME:

      >>> mysql_timestamp_converter('2007-02-25 22:32:17')
      datetime.datetime(2007, 2, 25, 22, 32, 17)

    MySQL < 4.1 uses a big string of numbers:

      >>> mysql_timestamp_converter('20070225223217')
      datetime.datetime(2007, 2, 25, 22, 32, 17)

    Illegal values are returned as None:

      >>> mysql_timestamp_converter('2007-02-31 22:32:17') is None
      True
      >>> mysql_timestamp_converter('00000000000000') is None
      True

    """
    if not isinstance(timestamp, unicode):
        timestamp = timestamp.decode(connection.charset)

    if timestamp[4] == '-':
        return convert_datetime(connection, field, timestamp)
    timestamp += "0"*(14-len(timestamp)) # padding
    year, month, day, hour, minute, second = \
        int(timestamp[:4]), int(timestamp[4:6]), int(timestamp[6:8]), \
        int(timestamp[8:10]), int(timestamp[10:12]), int(timestamp[12:14])
    try:
        return datetime.datetime(year, month, day, hour, minute, second)
    except ValueError:
        return None

def convert_set(s):
    return set(s.split(","))

def convert_bit(connection, field, b):
    #b = "\x00" * (8 - len(b)) + b # pad w/ zeroes
    #return struct.unpack(">Q", b)[0]
    #
    # the snippet above is right, but MySQLdb doesn't process bits,
    # so we shouldn't either
    return b

def convert_characters(connection, field, data):
    field_charset = charset_by_id(field.charsetnr).name
    if field.flags & FLAG.SET:
        return convert_set(data.decode(field_charset))
    if field.flags & FLAG.BINARY:
        return data

    if connection.use_unicode:
        data = data.decode(field_charset)
    elif connection.charset != field_charset:
        data = data.decode(field_charset)
        data = data.encode(connection.charset)
    else:
        data = data.decode(connection.charset)
    return data

def convert_int(connection, field, data):
    return int(data)

def convert_long(connection, field, data):
    return long(data)

def convert_float(connection, field, data):
    return float(data)

encoders = {
        bool: escape_bool,
        int: escape_int,
        long: escape_long,
        float: escape_float,
        str: escape_string,
        unicode: escape_unicode,
        tuple: escape_sequence,
        list:escape_sequence,
        set:escape_sequence,
        dict:escape_dict,
        type(None):escape_None,
        datetime.date: escape_date,
        datetime.datetime : escape_datetime,
        datetime.timedelta : escape_timedelta,
        datetime.time : escape_time,
        time.struct_time : escape_struct_time,
        }

decoders = {
        FIELD_TYPE.BIT: convert_bit,
        FIELD_TYPE.TINY: convert_int,
        FIELD_TYPE.SHORT: convert_int,
        FIELD_TYPE.LONG: convert_long,
        FIELD_TYPE.FLOAT: convert_float,
        FIELD_TYPE.DOUBLE: convert_float,
        FIELD_TYPE.DECIMAL: convert_float,
        FIELD_TYPE.NEWDECIMAL: convert_float,
        FIELD_TYPE.LONGLONG: convert_long,
        FIELD_TYPE.INT24: convert_int,
        FIELD_TYPE.YEAR: convert_int,
        FIELD_TYPE.TIMESTAMP: convert_mysql_timestamp,
        FIELD_TYPE.DATETIME: convert_datetime,
        FIELD_TYPE.TIME: convert_timedelta,
        FIELD_TYPE.DATE: convert_date,
        FIELD_TYPE.SET: convert_set,
        FIELD_TYPE.BLOB: convert_characters,
        FIELD_TYPE.TINY_BLOB: convert_characters,
        FIELD_TYPE.MEDIUM_BLOB: convert_characters,
        FIELD_TYPE.LONG_BLOB: convert_characters,
        FIELD_TYPE.STRING: convert_characters,
        FIELD_TYPE.VAR_STRING: convert_characters,
        FIELD_TYPE.VARCHAR: convert_characters,
        #FIELD_TYPE.BLOB: str,
        #FIELD_TYPE.STRING: str,
        #FIELD_TYPE.VAR_STRING: str,
        #FIELD_TYPE.VARCHAR: str
        }
conversions = decoders  # for MySQLdb compatibility

try:
    # python version > 2.3
    from decimal import Decimal
    def convert_decimal(connection, field, data):
        return Decimal(data)
    decoders[FIELD_TYPE.DECIMAL] = convert_decimal
    decoders[FIELD_TYPE.NEWDECIMAL] = convert_decimal

    def escape_decimal(obj):
        return unicode(obj)
    encoders[Decimal] = escape_decimal

except ImportError:
    pass