# -*- encoding: utf-8 -*-
# pylint: disable=E0203,E1101,C0111
"""
@file
@brief Runtime operator.
"""
from ._op import OpRun


class If(OpRun):

    atts = {
        'then_branch': None,
        'else_branch': None,
    }

    def __init__(self, onnx_node, desc=None, **options):
        OpRun.__init__(self, onnx_node, desc=desc,
                       expected_attributes=If.atts,
                       **options)
        if not hasattr(self.then_branch, 'run'):
            raise RuntimeError("Parameter 'then_branch' must have a method 'run', "
                               "type {}.".format(type(self.then_branch)))
        if not hasattr(self.else_branch, 'run'):
            raise RuntimeError("Parameter 'else_branch' must have a method 'run', "
                               "type {}.".format(type(self.else_branch)))

        self._run_meth_then = (self.then_branch.run_in_scan
                               if hasattr(self.then_branch, 'run_in_scan')
                               else self.then_branch.run)
        self._run_meth_else = (self.else_branch.run_in_scan
                               if hasattr(self.else_branch, 'run_in_scan')
                               else self.else_branch.run)

    def _run(self, cond, named_inputs=None):  # pylint: disable=W0221
        if named_inputs is None:
            named_inputs = {}
        if len(self.then_branch.input_names) > 0:
            if len(named_inputs) == 0:
                raise RuntimeError(  # pragma: no cover
                    "named_inputs is empty but the graph needs {}.".format(
                        self.then_branch.input_names))
            for k in self.then_branch.input_names:
                if k not in named_inputs:
                    raise RuntimeError(  # pragma: no cover
                        "Unable to find named input '{}' in\n{}.".format(
                            k, "\n".join(sorted(named_inputs))))
        if len(self.else_branch.input_names) > 0:
            if len(named_inputs) == 0:
                raise RuntimeError(  # pragma: no cover
                    "named_inputs is empty but the graph needs {}.".format(
                        self.then_branch.input_names))
            for k in self.else_branch.input_names:
                if k not in named_inputs:
                    raise RuntimeError(  # pragma: no cover
                        "Unable to find named input '{}' in\n{}.".format(
                            k, "\n".join(sorted(named_inputs))))

        if all(cond):
            outputs = self._run_meth_then(named_inputs)
            return tuple([outputs[name] for name in self.then_branch.output_names])
        outputs = self._run_meth_else(named_inputs)
        return tuple([outputs[name] for name in self.else_branch.output_names])

    def _infer_shapes(self, cond, named_inputs=None):  # pylint: disable=W0221
        res = self.then_branch._set_shape_inference_runtime()
        return tuple([res[name] for name in self.then_branch.output_names])
