from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import unittest
import numpy as np
import numpy.testing as npt  # type: ignore

from onnx import helper, numpy_helper

from onnx_coreml import convert
from onnx_coreml._graph import Graph
from onnx_coreml._transformers import ConvAddFuser, DropoutRemover, ImageScalerRemover
from tests._test_utils import _onnx_create_model, _test_onnx_model, \
    _conv_pool_output_size, _random_array


class ConvAddFuserTest(unittest.TestCase):
    def test_fuse_conv_without_bias(self):  # type: () -> None
        kernel_shape = (3, 2)
        strides = (2, 3)
        pads = (4, 2, 4, 2)
        dilations = (1, 2)
        group = 1
        weight = numpy_helper.from_array(
            _random_array((16, 3, 3, 2)), name="weight"
        )

        input_shape = (1, 3, 224, 224)
        output_size = _conv_pool_output_size(input_shape, dilations,
                                             kernel_shape, pads, strides)

        output_shape = (1, int(weight.dims[0]), output_size[0], output_size[1])

        inputs = [('input0', input_shape)]
        outputs = [('output0', output_shape)]

        conv = helper.make_node(
            "Conv",
            inputs=[inputs[0][0], "weight"],
            outputs=["conv_output"],
            dilations=dilations,
            group=group,
            kernel_shape=kernel_shape,
            pads=pads,
            strides=strides
        )

        b = _random_array((int(weight.dims[0]),))
        bias = numpy_helper.from_array(
            b, name="bias"
        )

        add = helper.make_node(
            "Add",
            inputs=[conv.output[0], "bias"],
            outputs=[outputs[0][0]],
            broadcast=1,
            axis=1
        )

        model = _onnx_create_model(
            [conv, add], inputs, outputs, [weight, bias]
        )
        graph_ = Graph.from_onnx(model.graph)
        fused_graph = graph_.transformed([ConvAddFuser()])

        self.assertEqual(len(fused_graph.nodes), 1)
        node = fused_graph.nodes[0]
        self.assertEqual(len(node.inputs), 3)
        npt.assert_equal(node.input_tensors[node.inputs[2]], b)
        self.assertEqual(fused_graph.nodes[0].outputs[0], outputs[0][0])

    def test_fuse_conv_with_bias(self):  # type: () -> None
        kernel_shape = (3, 2)
        strides = (2, 3)
        pads = (4, 2, 4, 2)
        dilations = (1, 2)
        group = 1
        weight = numpy_helper.from_array(
            _random_array((16, 3, 3, 2)), name="weight"
        )
        b = _random_array((int(weight.dims[0]),))
        bias = numpy_helper.from_array(
            b, name="bias"
        )

        input_shape = (1, 3, 224, 224)
        output_size = _conv_pool_output_size(input_shape, dilations,
                                             kernel_shape, pads, strides)

        output_shape = (1, int(weight.dims[0]), output_size[0], output_size[1])

        inputs = [('input0', input_shape)]
        outputs = [('output0', output_shape)]

        conv = helper.make_node(
            "Conv",
            inputs=[inputs[0][0], "weight", "bias"],
            outputs=["conv_output"],
            dilations=dilations,
            group=group,
            kernel_shape=kernel_shape,
            pads=pads,
            strides=strides
        )

        add = helper.make_node(
            "Add",
            inputs=[conv.output[0], "bias"],
            outputs=[outputs[0][0]],
            broadcast=1,
            axis=1
        )

        model = _onnx_create_model(
            [conv, add], inputs, outputs, [weight, bias]
        )
        graph_ = Graph.from_onnx(model.graph)
        fused_graph = graph_.transformed([ConvAddFuser()])

        self.assertEqual(len(fused_graph.nodes), 1)
        node = fused_graph.nodes[0]
        self.assertEqual(len(node.inputs), 3)
        npt.assert_equal(node.input_tensors[node.inputs[2]], b * 2)
        self.assertEqual(fused_graph.nodes[0].outputs[0], outputs[0][0])


class NodeRemoverTests(unittest.TestCase):

    def test_dropout_remover(self): # type: () -> None
        inputs = [('input', (1,3,50,50))]
        outputs = [('out', (1,5,50,50))]
        weight = numpy_helper.from_array(_random_array((5, 3, 1, 1)), name="weight")
        conv = helper.make_node(
            "Conv",
            inputs=["input", "weight"],
            outputs=["conv_output"],
            kernel_shape=(1,1),
            strides=(1,1)
        )
        drop = helper.make_node("Dropout",
                                inputs = ["conv_output"],
                                outputs = ["drop_output"],
                                )
        exp = helper.make_node("Exp",
                               inputs=["drop_output"],
                               outputs=['out'])

        onnx_model = _onnx_create_model([conv, drop, exp], inputs, outputs)

        graph = Graph.from_onnx(onnx_model.graph)
        new_graph = graph.transformed([DropoutRemover()])
        self.assertEqual(len(graph.nodes), 3)
        self.assertEqual(len(new_graph.nodes), 2)
        self.assertEqual(new_graph.nodes[0].inputs[0], 'input')
        self.assertEqual(new_graph.nodes[1].inputs[0], new_graph.nodes[0].outputs[0])
        self.assertEqual(new_graph.nodes[1].outputs[0], 'out')

    def test_image_scaler_remover(self): # type: () -> None
        inputs = [('input', (1,3,50,50))]
        outputs = [('out', (1,5,50,50))]

        im_scaler = helper.make_node("ImageScaler",
                                     inputs = ['input'],
                                     outputs = ['scaler_out'],
                                     bias = [10,-6,20], scale=3.0)

        exp = helper.make_node("Exp",
                               inputs=["scaler_out"],
                               outputs=['out'])

        onnx_model = _onnx_create_model([im_scaler, exp], inputs, outputs)

        graph = Graph.from_onnx(onnx_model.graph)
        new_graph = graph.transformed([ImageScalerRemover()])
        self.assertEqual(len(graph.nodes), 2)
        self.assertEqual(len(new_graph.nodes), 1)
        self.assertEqual(new_graph.nodes[0].inputs[0], 'input')
        self.assertEqual(new_graph.nodes[0].outputs[0], 'out')

        coreml_model = convert(onnx_model)
        spec = coreml_model.get_spec()

        self.assertEqual(spec.neuralNetwork.preprocessing[0].scaler.channelScale, 3.0)
        self.assertEqual(spec.neuralNetwork.preprocessing[0].scaler.blueBias, 20.0)
        self.assertEqual(spec.neuralNetwork.preprocessing[0].scaler.greenBias, -6.0)
        self.assertEqual(spec.neuralNetwork.preprocessing[0].scaler.redBias, 10.0)



class PixelShuffleFuserTest(unittest.TestCase):
    def test_pixel_shuffle(self):  # type: () -> None
        scale_factor = 2
        input_shape = (1, 8, 2, 2)
        output_shape = (
            input_shape[0],
            int(input_shape[1] / (scale_factor ** 2)),
            input_shape[2] * scale_factor,
            input_shape[3] * scale_factor
        )

        inputs = [('input0', input_shape)]
        outputs = [('output0', output_shape)]

        shape1 = [
            output_shape[0],
            output_shape[1],
            scale_factor,
            scale_factor,
            input_shape[2],
            input_shape[3]
        ]

        shape1 = numpy_helper.from_array(np.asarray(shape1), name="shape1")
        shape2 = numpy_helper.from_array(np.asarray(list(output_shape)), name="shape2")

        node_0 = helper.make_node(
            "Reshape",
            inputs=[inputs[0][0], 'shape1'],
            outputs=['node0'],
        )
        node_1 = helper.make_node(
            "Transpose",
            inputs=['node0'],
            outputs=['node1'],
            perm=[0, 1, 4, 2, 5, 3]
        )
        node_2 = helper.make_node(
            "Reshape",
            inputs=['node1','shape2'],
            outputs=[outputs[0][0]],
        )
        model = _onnx_create_model(
            [node_0, node_1, node_2], inputs, outputs, initializer=[shape1, shape2]
        )
        _test_onnx_model(model, decimal=7)


if __name__ == '__main__':
    unittest.main()
