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# Source code for samsifter.models.parameter

    # -*- coding: utf-8 -*-
    """
    Different types of command line parameters.

    .. moduleauthor:: Florian Aldehoff <faldehoff@student.uni-tuebingen.de>
    """
    from os.path import basename

    class FilterParameter():
        """Abstraction of a general command line argument for standalone filters.

        Serves as base class for thresholds and filepath arguments.
        """
        def __init__(self, text, desc, cli_name, default, value=None,
                     required=False, active=False):
            """Initialize new instance of FilterParameter.

            Parameters
            ----------
            text : str
                Short label of parameter in GUI, should not exceed one line.
            desc : str
                Longer description of parameter in GUI, should explain details of
                usage.
            cli_name : str
                Name of parameter in CLI, eg. ``--foo``
            default : str
                Default value, required for GUI widget presets.
            value : str, optional
                Parameter value set by GUI elements, default value is used if this
                is (by default) not set.
            required : bool, optional
                Is parameter required to run program? Defaults to False.
            active : bool, optional
                Is parameter activated? Defaults to False.
            """
            self.text = text
            self.desc = desc
            self.cli_name = cli_name
            self.default = default
            self.value = value
            self.required = required
            self.active = active        # should be set after value

        def clone(self):
            """Create new instance with identical settings.

            Returns
            -------
            FilterParameter
                Exact clone of this parameter.
            """
            return FilterParameter(
                self.text, self.desc, self.cli_name, self.default, self.value,
                self.required, self.active
            )

        def __str__(self):
            """String representation of this parameter."""
            return self.text

        def __repr__(self):
            """Representation of this parameter for debugging."""
            rep = "\n -> %s" % self.text
            rep += "\n    - description:\t%s" % self.desc
            rep += "\n    - default:\t%s" % self.default
            rep += "\n    - value\t:\t%s" % self.value
            rep += "\n    - CLI name:\t%s" % self.cli_name
            rep += "\n    - required:\t%s" % self.required
            rep += "\n    - active:\t%s" % self.active
            return rep

        def cli(self, basenames=False):
            """Representation of this parameter on command line interface."""
            if self.active or self.required:
                return self.cli_name
            else:
                return ""

        def get_form_text(self):
            """Representation of this parameter in form layouts."""
            return self.text + ":"

        """ Getters & Setters """

        def get_description(self):
            return self.desc

        def set_description(self, desc):
            self.desc = desc

        def set_value(self, value):
            self.value = value
            # here: value and active status are linked, override in derived classes
            self.active = value

        def get_value(self):
            if self.value is None:
                return self.default
            else:
                return self.value

        def set_default(self, default):
            self.default = default
            if self.value is None:
                self.value = default

        def get_default(self):
            return self.default

        def get_cli_name(self):
            return self.cli_name

        def set_cli_name(self, cli_name):
            self.cli_name = cli_name

        def is_active(self):
            return self.active

        def set_active(self, active=True):
            """Activate parameter to force showing it on the commandline."""
            self.active = active

        def is_required(self):
            return self.required

        def set_required(self, required=True):
            self.required = required

    class FilterThreshold(FilterParameter):
        """Abstraction of a numerical command line parameter used as treshold.

        Extends filter parameter by minimum and maximum of permitted value range
        with variable precision and optional unit.
        """

        def __init__(self, text, desc, cli_name, default=5.00, minimum=0.00,
                     maximum=100.00, precision=2, unit=None, value=None,
                     required=False, active=False):
            """Initialize new instance of FilterThreshold.

            Parameters
            ----------
            text : str
                Short label of parameter in GUI, should not exceed one line.
            desc : str
                Longer description of parameter in GUI, should explain details of
                usage.
            cli_name : str
                Name of parameter in CLI, eg. ``--foo``
            default : float, optional
                Default value, required for GUI widget presets; defaults to 5.
            minimum : float, optional
                Minimum of permitted value range, defaults to 0.
            maximum : float, optional
                Maximum of permitted value range, defaults to 100.
            precision : int, optional
                Number of required decimals for values, defaults to 2
                (eg. ``0.12``)
            unit : str, optional
                Value unit, will be used in labels within square brackets (eg.
                ``[kB]``)
            value : float, optional
                Parameter value set by GUI elements, default value is used if this
                is (by default) not set.
            required : bool, optional
                Is parameter required to run program? Defaults to False.
            active : bool, optional
                Is parameter activated? Defaults to False.
            """
            super(FilterThreshold, self).__init__(
                text, desc, cli_name, default, value, required, active
            )
            self.unit = unit
            self.minimum = minimum
            self.maximum = maximum
            self.precision = precision

        def clone(self):
            """Create new instance with identical settings.

            Returns
            -------
            FilterThreshold
                Exact clone of this parameter.
            """
            return FilterThreshold(
                self.text, self.desc, self.cli_name, self.default, self.minimum,
                self.maximum, self.precision, self.unit, self.value, self.required,
                self.active
            )

        def get_form_text(self):
            """Representation of this parameter in form layouts.

            Overrides base method and provides additional information on unit.
            """
            text = self.text
            if self.unit is not None:
                text += " [" + self.unit + "]"
            text += ":"
            return text

        def __repr__(self):
            """Representation of this parameter for debugging.

            Extends base method with additional attributes.
            """
            rep = super(FilterThreshold, self).__repr__()
            rep += "\n    - unit:\t\t%s" % self.unit
            rep += "\n    - minimum:\t%s" % self.minimum
            rep += "\n    - maximum:\t%s" % self.maximum
            rep += "\n    - precision:\t%s" % self.precision
            return rep

        def cli(self, basenames=False):
            """Representation of this parameter on command line interface.

            Overrides base method to handle unset values.
            """
            if self.active or self.required:
                if self.value is None:
                    return "%s %s" % (self.cli_name, self.default)
                else:
                    return "%s %s" % (self.cli_name, self.value)
            else:
                return ""

        """ Getters & Setters """

        def get_maximum(self):
            return self.maximum

        def set_maximum(self, maximum):
            self.maximum = maximum

        def get_minimum(self):
            return self.minimum

        def set_minimum(self, minimum):
            self.minimum = minimum

        def get_unit(self):
            return self.unit

        def set_unit(self, unit):
            self.unit = unit

        def get_precision(self):
            return self.precision

        def set_precision(self, precision):
            self.precision = precision

        def set_value(self, value):
            """Set value of parameter.

            Overriding base class to consider value precision.
            """
            if self.precision == 0:
                self.value = int(value)
            else:
                self.value = value
            # active parameter once value is changed
            self.active = self.value is not None

    class FilterFilepath(FilterParameter):
        """Parameter setting filepath for input or output file.

        Extends parameter base class with a list of supported file extensions and
        requirements for read and write access.
        """
        def __init__(self, text, desc, cli_name, default, extensions=['csv'],
                     readable=True, writable=False, value=None, required=False,
                     active=False):
            super(FilterFilepath, self).__init__(
                text, desc, cli_name, default, value, required, active
            )
            self.extensions = extensions
            self.readable = readable
            self.writable = writable

        def clone(self):
            """Create new instance with identical settings.

            Returns
            -------
            FilterParameter
                An exact copy of this instance.
            """
            return FilterFilepath(
                self.text, self.desc, self.cli_name, self.default, self.extensions,
                self.readable, self.writable, self.value, self.required,
                self.active
            )

        def __repr__(self):
            """Representation of this parameter for debugging.

            Extends base method with additional attributes.
            """
            rep = super(FilterFilepath, self).__repr__()
            rep += "\n    - extensions:\t%s" % self.extensions
            rep += "\n    - readable:\t%s" % self.readable
            rep += "\n    - writable:\t%s" % self.writable

            return rep

        def cli(self, basenames=False):
            """Representation of this parameter on command line interface.

            Overrides base method to handle option for shortened filepaths.

            Parameters
            ----------
            basenames : bool, optional
                Shorten file paths to filename only, defaults to False.

            Returns
            -------
            str
                Full command line argument for this parameter with optionally
                shortened filenames.
            """
            if self.active or self.required:
                if self.value is None:
                    if basenames:
                        return "%s %s" % (self.cli_name, basename(self.default))
                    else:
                        return "%s %s" % (self.cli_name, self.default)
                else:
                    if basenames:
                        return "%s %s" % (self.cli_name, basename(self.value))
                    else:
                        return "%s %s" % (self.cli_name, self.value)
            else:
                return ""

        """ Getters & Setters """

        def set_value(self, value):
            """Set parameter value.

            Overrides base method to active parameter only when value has changed.
            """
            self.value = value
            # active parameter once value is changed
            self.active = self.value is not None

        def get_extensions(self):
            return self.extensions

        def set_extensions(self, extensions):
            self.extensions = extensions

    class FilterSwitch(FilterParameter):
        """Command line switch for a list of exclusive options.

        Extends base class with a list of selectable options. Defaults to a simple
        binary switch between True and False.
        """
        def __init__(self, text, desc, cli_name, default, options=[True, False],
                     value=None, required=False, active=False):
            super(FilterSwitch, self).__init__(
                text, desc, cli_name, default, value, required, active
            )
            self.options = options

        def clone(self):
            """Create new instance with identical settings.

            Returns
            -------
            FilterSwitch
                An exact copy of this instance.
            """
            return FilterSwitch(
                self.text, self.desc, self.cli_name, self.default, self.options,
                self.value, self.required, self.active
            )

        def __repr__(self):
            """Representation of this parameter for debugging.

            Extends base method with additional attributes.
            """
            rep = super(FilterSwitch, self).__repr__()
            rep += "\n    - options\t%s" % self.options
            return rep

        def cli(self, basenames=False):
            """Representation of this parameter on command line interface.

            Overrides base method to handle unset values.
            """
            if self.active or self.required:
                if self.value is None:
                    return "%s %s" % (self.cli_name, self.default)
                else:
                    return "%s %s" % (self.cli_name, self.value)
            else:
                return ""

        """ Getters & Setters """

        def set_value(self, value):
            """Set parameter value.

            Overrides base method to active parameter only when value has changed.
            """
            self.value = value
            # active parameter once value is changed
            self.active = self.value is not None

        def get_option(self, index):
            """Get specific option out of the available options.

            Parameters
            ----------
            index : int
                Index of option in list of options.

            Returns
            -------
            str
                Desired option (or None on invalid index)
            """
            try:
                return self.options[index]
            except IndexError:
                return None

        def get_options(self):
            return self.options

        def set_options(self, options):
            self.options = options

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