class Error(Exception):
    """Base validation exception."""


class SchemaError(Error):
    """An error was encountered in the schema."""


class Invalid(Error):
    """The data was invalid.

    :attr msg: The error message.
    :attr path: The path to the error, as a list of keys in the source data.
    :attr error_message: The actual error message that was raised, as a
        string.

    """

    def __init__(self, message, path=None, error_message=None, error_type=None):
        Error.__init__(self, message)
        self.path = path or []
        self.error_message = error_message or message
        self.error_type = error_type

    @property
    def msg(self):
        return self.args[0]

    def __str__(self):
        path = ' @ data[%s]' % ']['.join(map(repr, self.path)) \
            if self.path else ''
        output = Exception.__str__(self)
        if self.error_type:
            output += ' for ' + self.error_type
        return output + path

    def prepend(self, path):
        self.path = path + self.path


class MultipleInvalid(Invalid):
    def __init__(self, errors=None):
        self.errors = errors[:] if errors else []

    def __repr__(self):
        return 'MultipleInvalid(%r)' % self.errors

    @property
    def msg(self):
        return self.errors[0].msg

    @property
    def path(self):
        return self.errors[0].path

    @property
    def error_message(self):
        return self.errors[0].error_message

    def add(self, error):
        self.errors.append(error)

    def __str__(self):
        return str(self.errors[0])

    def prepend(self, path):
        for error in self.errors:
            error.prepend(path)


class RequiredFieldInvalid(Invalid):
    """Required field was missing."""


class ObjectInvalid(Invalid):
    """The value we found was not an object."""


class DictInvalid(Invalid):
    """The value found was not a dict."""


class ExclusiveInvalid(Invalid):
    """More than one value found in exclusion group."""


class InclusiveInvalid(Invalid):
    """Not all values found in inclusion group."""


class SequenceTypeInvalid(Invalid):
    """The type found is not a sequence type."""


class TypeInvalid(Invalid):
    """The value was not of required type."""


class ValueInvalid(Invalid):
    """The value was found invalid by evaluation function."""


class ContainsInvalid(Invalid):
    """List does not contain item"""


class ScalarInvalid(Invalid):
    """Scalars did not match."""


class CoerceInvalid(Invalid):
    """Impossible to coerce value to type."""


class AnyInvalid(Invalid):
    """The value did not pass any validator."""


class AllInvalid(Invalid):
    """The value did not pass all validators."""


class MatchInvalid(Invalid):
    """The value does not match the given regular expression."""


class RangeInvalid(Invalid):
    """The value is not in given range."""


class TrueInvalid(Invalid):
    """The value is not True."""


class FalseInvalid(Invalid):
    """The value is not False."""


class BooleanInvalid(Invalid):
    """The value is not a boolean."""


class UrlInvalid(Invalid):
    """The value is not a URL."""


class EmailInvalid(Invalid):
    """The value is not an email address."""


class FileInvalid(Invalid):
    """The value is not a file."""


class DirInvalid(Invalid):
    """The value is not a directory."""


class PathInvalid(Invalid):
    """The value is not a path."""


class LiteralInvalid(Invalid):
    """The literal values do not match."""


class LengthInvalid(Invalid):
    pass


class DatetimeInvalid(Invalid):
    """The value is not a formatted datetime string."""


class DateInvalid(Invalid):
    """The value is not a formatted date string."""


class InInvalid(Invalid):
    pass


class NotInInvalid(Invalid):
    pass


class ExactSequenceInvalid(Invalid):
    pass


class NotEnoughValid(Invalid):
    """The value did not pass enough validations."""
    pass


class TooManyValid(Invalid):
    """The value passed more than expected validations."""
    pass