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"""Definition of ARM CPU operator strategy."""
# pylint: disable=invalid-name,unused-argument,wildcard-import,unused-wildcard-import
import re
import logging

import topi
from .generic import *
from .. import op as _op

logger = logging.getLogger('strategy')

@schedule_injective.register("arm_cpu")
def schedule_injective_arm_cpu(_, outs, target):
    """schedule injective ops for arm cpu"""
    with target:
        return topi.arm_cpu.schedule_injective(outs)

@schedule_concatenate.register("arm_cpu")
def schedule_concatenate_arm_cpu(_, outs, target):
    """schedule concatenate for arm cpu"""
    with target:
        return topi.arm_cpu.schedule_concatenate(outs)

@conv2d_strategy.register("arm_cpu")
def conv2d_strategy_arm_cpu(attrs, inputs, out_type, target):
    """conv2d arm cpu strategy"""
    strategy = _op.OpStrategy()
    data, kernel = inputs
    dilation_h, dilation_w = attrs.get_int_tuple("dilation")
    stride_h, stride_w = attrs.get_int_tuple("strides")
    padding = attrs.get_int_tuple("padding")
    groups = attrs.groups
    layout = attrs.data_layout
    kernel_layout = attrs.kernel_layout
    if dilation_h < 1 or dilation_w < 1:
        raise ValueError("dilation should be positive value")

    if groups == 1:
        if layout == "NCHW":
            if kernel_layout == "OIHW":
                strategy.add_implementation(
                    wrap_compute_conv2d(topi.arm_cpu.conv2d_nchw_spatial_pack),
                    wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_nchw_spatial_pack),
                    name="conv2d_nchw_spatial_pack.arm_cpu")
                # check if winograd algorithm is applicable
                _, _, kh, kw = get_const_tuple(kernel.shape)
                pt, pl, pb, pr = topi.nn.get_pad_tuple(padding, (kh, kw))
                if kh == 3 and kw == 3 and stride_h == 1 and stride_w == 1 and \
                    dilation_h == 1 and dilation_w == 1:
                    strategy.add_implementation(
                        wrap_compute_conv2d(topi.arm_cpu.conv2d_nchw_winograd),
                        wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_nchw_winograd),
                        name="conv2d_nchw_winograd.arm_cpu",
                        plevel=5)
                    if "nnpack" in target.libs and pt == 1 and pb == 1 and pl == 1 and pr == 1:
                        strategy.add_implementation(
                            wrap_compute_conv2d(topi.arm_cpu.conv2d_nchw_winograd_nnpack),
                            wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_nchw_winograd_nnpack),
                            name="conv2d_nchw_winograd_nnpack.arm_cpu",
                            plevel=15)
            elif re.match(r"OIHW\d*o", kernel_layout):
                strategy.add_implementation(
                    wrap_compute_conv2d(topi.arm_cpu.conv2d_nchw_spatial_pack),
                    wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_nchw_spatial_pack),
                    name="conv2d_nchw_spatial_pack.arm_cpu")
            else:
                raise RuntimeError("Unsupported weight layout {} for conv2d NCHW".
                                   format(kernel_layout))
        elif layout == "HWCN":
            assert kernel_layout == "HWIO"
            logger.warning("conv2d_hwcn is not optimized for arm cpu.")
            strategy.add_implementation(
                wrap_compute_conv2d(topi.nn.conv2d_hwcn),
                wrap_topi_schedule(topi.generic.schedule_conv2d_hwcn),
                name="conv2d_hwcn.generic")
        elif layout == "NHWC":
            assert kernel_layout == "HWIO"
            strategy.add_implementation(
                wrap_compute_conv2d(topi.arm_cpu.conv2d_nhwc_spatial_pack),
                wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_nhwc_spatial_pack),
                name="conv2d_nhwc_spatial_pack.arm_cpu")
        else:
            raise RuntimeError("Unsupported conv2d layout {} for arm cpu".format(layout))
    elif is_depthwise_conv2d(data.shape, layout, kernel.shape, kernel_layout, groups):
        if layout == "NCHW":
            assert kernel_layout == "OIHW" or re.match(r"OIHW\d*o", kernel_layout)
            if kernel_layout == "OIHW":
                strategy.add_implementation(
                    wrap_compute_conv2d(topi.arm_cpu.depthwise_conv2d_nchw),
                    wrap_topi_schedule(topi.arm_cpu.schedule_depthwise_conv2d_nchw),
                    name="depthwise_conv2d_nchw.arm_cpu")
            # TODO:
            # This schedule has incorrect result on some hardware platforms (like NV Jetson TX2)
            # Let us comment it out but not remove.
            # see discussion:
            # https://discuss.tvm.ai/t/autotuner-incorrect-result-after-tuning-mobilenetv2-on-arm-cpu/6088
            # strategy.add_implementation(
            #     wrap_compute_conv2d(topi.arm_cpu.depthwise_conv2d_nchw_spatial_pack),
            #     wrap_topi_schedule(topi.arm_cpu.schedule_depthwise_conv2d_nchw_spatial_pack),
            #     name="depthwise_conv2d_nchw_spatial_pack.arm_cpu",
            #     plevel=15)
        elif layout == "NHWC":
            assert kernel_layout == "HWOI"
            logger.warning("depthwise_conv2d with layout NHWC is not optimized for arm cpu.")
            strategy.add_implementation(
                wrap_compute_conv2d(topi.nn.depthwise_conv2d_nhwc),
                wrap_topi_schedule(topi.generic.schedule_depthwise_conv2d_nhwc),
                name="depthwise_conv2d_nhwc.generic")
        else:
            raise RuntimeError("Unsupported depthwise_conv2d layout {} for arm cpu".
                               format(layout))
    else: # group_conv2d
        if layout == 'NCHW':
            assert kernel_layout == "OIHW"
            logger.warning("group_conv2d with layout NCHW is not optimized for arm cpu.")
            strategy.add_implementation(
                wrap_compute_conv2d(topi.nn.group_conv2d_nchw, has_groups=True),
                wrap_topi_schedule(topi.generic.schedule_group_conv2d_nchw),
                name="group_conv2d_nchw.generic")
        else:
            raise RuntimeError("Unsupported group_conv2d layout {} for arm cpu".
                               format(layout))
    return strategy

def wrap_compute_conv2d_winograd_nnpack(topi_compute):
    """wrap topi compute for conv2d_winograd NNPack"""
    def _compute_conv2d_nnpack(attrs, inputs, out_type):
        padding = attrs.get_int_tuple("padding")
        strides = attrs.get_int_tuple("strides")
        dilation = attrs.get_int_tuple("dilation")
        out_dtype = attrs.get_str("out_dtype")
        out_dtype = inputs[0].dtype if out_dtype in ("same", "") else out_dtype
        return [topi_compute(inputs[0], inputs[1], None, strides, padding,
                             dilation, out_dtype)]
    return _compute_conv2d_nnpack

@conv2d_winograd_without_weight_transfrom_strategy.register("arm_cpu")
def conv2d_winograd_without_weight_transfrom_strategy_arm_cpu(attrs, inputs, out_type, target):
    """conv2d_winograd_without_weight_transfrom arm cpu strategy"""
    dilation = attrs.get_int_tuple("dilation")
    groups = attrs.get_int("groups")
    layout = attrs.data_layout
    strides = attrs.get_int_tuple("strides")
    kernel = inputs[1]
    assert dilation == (1, 1), "Do not support dilate now"
    assert strides == (1, 1), "Do not support strides now"
    assert groups == 1, "Do not supoort arbitrary group number"
    strategy = _op.OpStrategy()
    if layout == "NCHW":
        if len(kernel.shape) == 5:
            pad_kh, pad_kw, _, _, _ = get_const_tuple(inputs[1].shape)
            tile_size = attrs.get_int("tile_size")
            kh = pad_kh - tile_size + 1
            kw = pad_kw - tile_size + 1
            assert kh == 3 and kw == 3
            strategy.add_implementation(
                wrap_compute_conv2d(topi.arm_cpu.conv2d_nchw_winograd),
                wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_nchw_winograd),
                name="conv2d_nchw_winograd.arm_cpu")
        elif len(kernel.shape) == 4:
            # kernel must be packed by winograd nnpack
            assert "nnpack" in target.libs
            strategy.add_implementation(
                wrap_compute_conv2d_winograd_nnpack(
                    topi.arm_cpu.conv2d_nchw_winograd_nnpack_without_weight_transform),
                wrap_topi_schedule(
                    topi.arm_cpu.schedule_conv2d_nchw_winograd_nnpack_without_weight_transform),
                name="conv2d_nchw_winograd_nnpack_withou_weight_transform.arm_cpu",
                plevel=15)
        else:
            raise RuntimeError("Unsupported kernel shape: {}".format(kernel.shape))
    else:
        raise RuntimeError("Unsupported conv2d_winograd_without_weight_transfrom layout {}".
                           format(layout))
    return strategy

@conv2d_transpose_strategy.register("arm_cpu")
def conv2d_transpose_strategy_arm_cpu(attrs, inputs, out_type, target):
    """conv2d_transpose arm cpu strategy"""
    layout = attrs.data_layout
    dilation = get_const_tuple(attrs.dilation)
    groups = attrs.groups
    assert layout == "NCHW", "only support nchw for now"
    assert dilation == (1, 1), "not support dilate now"
    assert groups == 1, "only support groups == 1 for now"
    strategy = _op.OpStrategy()
    strategy.add_implementation(
        wrap_compute_conv2d_transpose(topi.arm_cpu.conv2d_transpose_nchw),
        wrap_topi_schedule(topi.arm_cpu.schedule_conv2d_transpose_nchw),
        name="conv2d_tranpose_nchw.arm_cpu")
    return strategy

@bitserial_conv2d_strategy.register("arm_cpu")
def bitserial_conv2d_strategy_arm_cpu(attrs, inputs, out_type, target):
    """bitserial_conv2d x86 strategy"""
    strategy = _op.OpStrategy()
    layout = attrs.data_layout
    if layout == "NCHW":
        strategy.add_implementation(
            wrap_compute_bitserial_conv2d(topi.x86.bitserial_conv2d_nchw),
            wrap_topi_schedule(topi.x86.schedule_bitserial_conv2d_nchw),
            name="bitserial_conv2d_nchw.arm_cpu")
    elif layout == "NHWC":
        strategy.add_implementation(
            wrap_compute_bitserial_conv2d(topi.arm_cpu.bitserial_conv2d_nhwc),
            wrap_topi_schedule(topi.arm_cpu.schedule_bitserial_conv2d_nhwc),
            name="bitserial_conv2d_nhwc.arm_cpu")
    else:
        raise ValueError("Data layout {} not supported.".format(layout))
    return strategy

@bitserial_dense_strategy.register("arm_cpu")
def schedule_bitserial_dense_arm_cpu(attrs, inputs, out_type, target):
    """bitserial_dense arm cpu strategy"""
    strategy = _op.OpStrategy()
    strategy.add_implementation(
        wrap_compute_bitserial_dense(topi.arm_cpu.bitserial_dense),
        wrap_topi_schedule(topi.arm_cpu.schedule_bitserial_dense),
        name="bitserial_dense.arm_cpu")
    return strategy
