from twisted.internet import defer

import re
from decorator import decorator
from inspect import getcallargs

from .error import ValidateException, NotATelNumber, InvalidMail
from .telnumber import Telnumber

def vBool(value, field):
    '''Validator for boolean values'''
    t=[True, 1, "true", "True", "TRUE"]
    f=[False, 0, "false", "False", "FALSE"]
    if value in t:
        return True
    elif value in f:
        return False
    else:
        raise ValidateException(field=field, msg='%s is not boolean' % field)


def vHash(value,field,minlength=None,maxlength=None):
    '''Validator for hash values'''
    if not re.match(r'^[a-f0-9]*$', value.lower()):
        raise ValidateException(field=field)
    if minlength and len(value)<minlength:
        raise ValidateException(field=field)
    if maxlength and len(value)>maxlength:
        raise ValidateException(field=field)
    return value

def vTel(value,field):
    '''Validator for Telefonnumbers'''
    ret = []
    for v in value:
        try:
            ret.append(Telnumber(v))
        except NotATelNumber, e:
            e.field=field
            raise e
    return ret

def vEmail(value, field):
    '''validator for emailadresses (see wikipeda for strange mailadresses and RFC3696)
    valid:
    "very.(),:;<>[]\\".VERY.\\"very@\\\ \\"very\\".unusual"@strange.example.com
    ""@example.org
    "very.unusual.@.unusual.com"@example.com'

    not valid:
    Abc.@example.com
    Abc..123@example.com
    thisis."notallowed@example.com
    this\\ still\\"not\\allowed@example.com
    '''
    ret = []
    for v in value:
        parts= re.match(r'^(.*)@(.+?)$',v)
        if not parts:
            raise InvalidMail(v,field)
        local=parts.group(1)
        domain=parts.group(2)
        
        if not re.match(r'^(\[[0-9\.]{7,16}\]|\[[0-9a-f:]{3,}\]|([a-z0-9+\-%_]+\.)+[a-z]{2,6})$',domain.lower()):
            raise InvalidMail(v,field)
       
        if local == "":
            continue
        if local.startswith(".") or local.endswith("."):
            raise InvalidMail(v,field)
        unquote = True
        parts = local.split('"')
        c=0
        i=0
        for part in parts:
            if unquote and part != "":                     #unquoted is not allowd so much
                if not re.match(r'^[^\\,\[\];\(\)@<>: ]+$',part) or ".." in part:
                    raise InvalidMail(v,field)
            if i == 0:
                if unquote and part != "" and len(parts) > 1 and part[-1] != '.': #quoted parts must be seperated by a dot
                    raise InvalidMail(v,field)
                unquote = not unquote
                c+=1
            elif part == ''  or part[-1] != "\\":
                if unquote  and part != "":         #quoted parts must be seperated by a dot
                    if part[0] != ".":
                        raise InvalidMail(v,field)
                    if i < len(parts)-1 and part[-1] != '.':
                        raise InvalidMail(v,field)
                unquote = not unquote
                c += 1
            i += 1
        if c%2 == 0 and c > 1:                        #no single quote allowed
            raise InvalidMail(v,field)
        ret.append(v)
    return ret

def validate(kwd,func, need=True,*args,**kargs):
    '''validate decorator
    use it like this:
        @validate(kwd=userhash, func=vuserhash)
        f(userhash)
    that will validate usrhash with the function vuserhash.
    Every validate function should raise an Exception, if the the value is not valid'''
    @decorator
    def v(f,*a,**k):
        kp=getcallargs(f,*a,**k)
        def dfunc(*x,**y):
            return None
        try:
            if need or kp[kwd] is not None:
                dfunc=func
        except KeyError:
            if need:
                raise ValidateException(field=kwd,msg="%s is nessasary"%kwd)

        def _gotResult(value):
            kp[kwd] = value
            e = defer.maybeDeferred(f,**kp)
            return e
        d = defer.maybeDeferred(dfunc, kp[kwd],kwd,*args,**kargs)
        return d.addCallback(_gotResult)
    return v