# pylint: disable=invalid-name,unused-variable,unused-argument,no-else-return, too-many-arguments, too-many-locals, too-many-statements, no-member, too-many-branches, too-many-boolean-expressions
"""conv2d schedule on Intel Graphics"""

from __future__ import absolute_import as _abs

import warnings
import tvm

from .. import generic
from .. import util
from .. import tag
from ..nn import pad
from ..nn.conv2d import conv2d, conv2d_NCHWc, conv2d_alter_layout, _get_workload
from ..nn.util import get_pad_tuple
from ..util import simplify



##### SCHEDULE UTILITIES #####
def tile_and_bind3d(s, tensor, z, y, x, z_factor=2, y_factor=None, x_factor=None):
    """ tile and bind 3d """
    y_factor = y_factor or z_factor
    x_factor = x_factor or y_factor
    zo, zi = s[tensor].split(z, z_factor)
    yo, yi = s[tensor].split(y, y_factor)
    xo, xi = s[tensor].split(x, x_factor)
    s[tensor].reorder(zo, yo, xo, zi, yi, xi)

    thread_z = tvm.thread_axis((0, z_factor), "threadIdx.z")
    thread_y = tvm.thread_axis((0, y_factor), "threadIdx.y")
    thread_x = tvm.thread_axis((0, x_factor), "threadIdx.x")
    s[tensor].bind(zo, tvm.thread_axis("blockIdx.z"))
    s[tensor].bind(zi, thread_z)
    s[tensor].bind(yo, tvm.thread_axis("blockIdx.y"))
    s[tensor].bind(yi, thread_y)
    s[tensor].bind(xo, tvm.thread_axis("blockIdx.x"))
    s[tensor].bind(xi, thread_x)
    return xi, thread_z, thread_y, thread_x

@conv2d_alter_layout.register(["intel_graphics"])
def _alter_conv2d_layout(attrs, inputs, tinfos, F):
    import nnvm.symbol as sym
    if F != sym:
        warnings.warn("Only support alter layout for intel graphics in NNVM now. "
                      "This pass is ignored in relay.")
        return None

    copy_inputs = [s for s in inputs]

    data = tinfos[0]
    kernel = tinfos[1]

    import ast
    padding = ast.literal_eval(attrs['padding'])
    stride = ast.literal_eval(attrs['strides'])

    wkl = _get_workload(data, kernel, stride, padding, data.dtype)
    oc_bn = 1
    kernel_shape = util.get_const_tuple(kernel.shape)
    for oc_bn in range(16, 1, -1):
        if kernel_shape[0] % oc_bn == 0:
            break

    new_attrs = {k: attrs[k] for k in attrs.keys()}
    new_attrs['kernel_layout'] = 'OIHW%do' % (oc_bn)

    return sym.contrib.conv2d_NCHWc(*copy_inputs, **new_attrs)

@conv2d_NCHWc.register(["intel_graphics"])
def _decl_conv2d(data, kernel, stride, padding, dilation, layout, out_layout, out_dtype='float32'):
    """Conv2D operator for Intel Graphics backend.

    Parameters
    ----------
    data : tvm.Tensor
        4-D with shape [batch, in_channel, in_height, in_width]

    kernel : tvm.Tensor
        5-D with shape [num_filter, in_channel, filter_height, filter_width, nnum_filter_vec]

    stride : int or a list/tuple of two ints
        stride size, or [stride_height, stride_width]

    padding : int or a list/tuple of two ints
        padding size, or [pad_height, pad_width]

    layout : str
        layout of data

    Returns
    -------
    output : tvm.Tensor
        4-D with shape [batch, out_channel, out_height, out_width]
    """
    assert data.shape[0].value == 1, "only support batch size=1 convolution on intel gpu"
    assert data.dtype == kernel.dtype, "Do not support inputs with different data types now."

    out_dtype = data.dtype
    HPAD, WPAD, _, _ = get_pad_tuple(padding, kernel)
    kernel_shape = util.get_const_tuple(kernel.shape)
    if isinstance(stride, (tuple, list)):
        HSTR, WSTR = stride
    else:
        HSTR, WSTR = stride, stride

    return _decl_cl_spatialpack_NCHWc(data, kernel, stride, padding, out_dtype)

@generic.schedule_conv2d_NCHWc.register(["intel_graphics"])
def schedule_conv2d_NCHWc(outs):
    """Schedule for conv2d_nchw for Intel Graphics

    Parameters
    ----------
    outs: Array of Tensor
        The computation graph description of conv2d_nchw
        in the format of an array of tensors.

    Returns
    -------
    s: Schedule
        The computation schedule for conv2d_nchw.
    """
    outs = [outs] if isinstance(outs, tvm.tensor.Tensor) else outs
    s = tvm.create_schedule([x.op for x in outs])
    scheduled_ops = []

    def traverse(op):
        """inline all one-to-one-mapping operators except the last stage (output)"""
        if tag.is_broadcast(op.tag):
            if op not in s.outputs:
                s[op].compute_inline()
            for tensor in op.input_tensors:
                if tensor.op.input_tensors and tensor.op not in scheduled_ops:
                    traverse(tensor.op)
        if 'conv2d' in op.tag:
            _schedule_cl_spatialpack_NCHWc(s, op)

        scheduled_ops.append(op)

    traverse(outs[0].op)

    return s

def _decl_cl_spatialpack_NCHWc(data, kernel, stride, padding, out_dtype='float16'):
    batch, in_channel, in_height, in_width = [util.get_const_int(x) for x in data.shape]
    num_filter, channel, kernel_h, kernel_w, nv = [util.get_const_int(x) for x in kernel.shape]
    num_filter = num_filter * nv
    pad_top, pad_left, pad_down, pad_right = get_pad_tuple(padding, kernel)

    if isinstance(stride, (tuple, list)):
        stride_h, stride_w = stride
    else:
        stride_h, stride_w = stride, stride

    out_channel = num_filter
    out_height = simplify((in_height - kernel_h + pad_top + pad_down) // stride_h + 1)
    out_width = simplify((in_width - kernel_w + pad_left + pad_right) // stride_w + 1)
    oshape = (batch, out_channel, out_height, out_width)

    rc = tvm.reduce_axis((0, in_channel), name='rc')
    ry = tvm.reduce_axis((0, kernel_h), name='ry')
    rx = tvm.reduce_axis((0, kernel_w), name='rx')

    block_w = 1
    block_h = 1
    if stride_h == 2:
        if num_filter + kernel_h == 515:
            block_h = 4
            block_w = 4
        else:
            block_h = 4
            block_w = 5
    elif kernel_h == 3:
        if num_filter == 512:
            block_h = 2
            block_w = 7
        else:
            block_h = 2
            block_w = 14
    elif kernel_h == 7 and padding == 3 and stride == 1:
        block_h = 3
        block_w = 4
    else:
        block_h = 1
        block_w = 16

    attrs = {'block_h': block_h, 'block_w' : block_w}
    c_h = out_height
    c_w = out_width

    if not out_height % block_h == 0:
        c_h = (out_height // block_h + 1) * block_h

    if not out_width % block_w == 0:
        c_w = (out_width // block_w + 1) * block_w

    pad_before = [0, 0, pad_top, pad_left]
    pad_after = [0, 0, pad_down + c_h - block_h, pad_right + c_w - block_w]
    temp = pad(data, pad_before, pad_after, name="pad_temp")

    cshape = (batch, out_channel // nv, c_h, c_w, nv)

    conv = tvm.compute(
        cshape,
        lambda nn, ff, yy, xx, vc:\
          tvm.sum(
              temp[nn, rc, yy * stride_h + ry, xx * stride_w + rx].astype(out_dtype) *
              kernel[ff, rc, ry, rx, vc].astype(out_dtype),
              axis=[rc, ry, rx]), name='conv', attrs=attrs)

    output = tvm.compute(
        oshape,
        lambda nn, ff, yy, xx:
        conv[nn][ff//nv][yy][xx][ff%nv],
        name='output_unpack', tag='conv2d')

    return output

def _schedule_cl_spatialpack_NCHWc(s, op):
    output = op.output(0)
    _, _, out_height, out_width = [util.get_const_int(x) for x in output.shape]

    conv = op.input_tensors[0]
    temp = s[conv].op.input_tensors[0]
    kernel = s[conv].op.input_tensors[1]
    temp_W = s.cache_read(temp, "warp", [conv])
    conv_L = s.cache_write(conv, "local")

    kernel_L = s.cache_read(kernel, "local", [conv_L])
    _, in_channel, temp_h, temp_w = [util.get_const_int(x) for x in temp.shape]

    attrs = s[conv].op.attrs
    OUTPUT_BLOCK_HEIGHT = attrs['block_h']
    OUTPUT_BLOCK_WIDTH = attrs['block_w']

    # schedule conv
    z_factor = 1
    y_factor = 1
    x_factor = 16
    thread_z = tvm.thread_axis((0, z_factor), "threadIdx.z")
    thread_y = tvm.thread_axis((0, y_factor), "threadIdx.y")
    thread_x = tvm.thread_axis((0, x_factor), "threadIdx.x")
    _, co, oh, ow, vc = s[conv].op.axis
    ooh, ioh = s[conv].split(oh, factor=OUTPUT_BLOCK_HEIGHT)
    oow, iow = s[conv].split(ow, factor=OUTPUT_BLOCK_WIDTH)
    s[conv].reorder(_, co, ooh, oow, vc, ioh, iow)
    coo, coi = s[conv].split(co, nparts=1)
    ooho, oohi = s[conv].split(ooh, factor=z_factor)
    oowo, oowi = s[conv].split(oow, factor=y_factor)
    vco, vci = s[conv].split(vc, factor=x_factor)
    s[conv].reorder(_, coo, vco, ooho, oowo, coi, oohi, oowi, vci, ioh, iow)
    s[conv].bind(oohi, thread_z)
    s[conv].bind(oowi, thread_y)
    s[conv].bind(vci, thread_x)
    s[conv].bind(ooho, tvm.thread_axis("blockIdx.z"))
    s[conv].bind(oowo, tvm.thread_axis("blockIdx.y"))
    s[conv].bind(coi, tvm.thread_axis("blockIdx.x"))

    # schedule conv_L
    s[conv_L].compute_at(s[conv], vci)
    i, oc, h, w, vc = s[conv_L].op.axis
    rc, ry, rx = s[conv_L].op.reduce_axis
    s[conv_L].reorder(i, oc, rc, ry, rx, vc, h, w)
    s[temp_W].compute_at(s[conv_L], rc)
    if kernel.shape[3].value != 7:
        s[conv_L].unroll(ry)
        s[conv_L].unroll(rx)

    # schedule temp
    _, ci, h, w = s[temp].op.axis
    tile_and_bind3d(s, temp, ci, h, w, 1, 16, 16)

    # schedule temp_W
    _, ci, h, w = s[temp_W].op.axis
    zo, zi = s[temp_W].split(ci, 1)
    yo, yi = s[temp_W].split(h, 1)
    xo, xi = s[temp_W].split(w, 16)
    s[temp_W].reorder(zo, yo, xo, zi, yi, xi)
    s[temp_W].bind(zi, thread_z)
    s[temp_W].bind(yi, thread_y)
    s[temp_W].bind(xi, thread_x)
    s[temp_W].storage_align(s[temp_W].op.axis[2], 16, 0)

    #schedule kernel

    # schedule kernel_L
    if "2_14" in s[conv].op.tag:
        s[kernel_L].compute_at(s[conv_L], ry)
    else:
        s[kernel_L].compute_at(s[conv_L], rx)

    # schedule output
    if output.op in s.outputs:
        out = output
    else:
        s[output].compute_inline()
        out = s.outputs[0]

    _, co, h, w = s[out].op.axis
    tile_and_bind3d(s, out, w, h, co, 4, 8, 8)


@conv2d.register(["intel_graphics"])
def decl_conv2d(data, kernel, stride, padding, dilation, layout='NCHW', out_dtype='float32'):
    """Conv2D operator for Intel Graphics backend.

    Parameters
    ----------
    data : tvm.Tensor
        4-D with shape [batch, in_channel, in_height, in_width]
    kernel : tvm.Tensor
        4-D with shape [num_filter, in_channel, filter_height, filter_width]
    stride : int or a list/tuple of two ints
        stride size, or [stride_height, stride_width]
    padding : int or a list/tuple of two ints
        padding size, or [pad_height, pad_width]
    layout : str
        layout of data
    Returns
    -------
    output : tvm.Tensor
        4-D with shape [batch, out_channel, out_height, out_width]
    """
    assert layout == 'NCHW', "only support NCHW convolution on intel gpu"
    assert data.shape[0].value == 1, "only support batch size=1 convolution on intel gpu"
    assert data.dtype == kernel.dtype, "Do not support inputs with different data types now."

    out_dtype = data.dtype
    HPAD, WPAD, _, _ = get_pad_tuple(padding, kernel)
    kernel_shape = util.get_const_tuple(kernel.shape)
    if isinstance(stride, (tuple, list)):
        HSTR, WSTR = stride
    else:
        HSTR, WSTR = stride, stride

    return _decl_cl_spatialpack(data, kernel, stride, padding, layout, out_dtype)

@generic.schedule_conv2d_nchw.register(["intel_graphics"])
def schedule_conv2d_nchw(outs):
    """Schedule for conv2d_nchw for Intel Graphics

    Parameters
    ----------
    outs: Array of Tensor
        The computation graph description of conv2d_nchw
        in the format of an array of tensors.
    Returns
    -------
    s: Schedule
        The computation schedule for conv2d_nchw.
    """
    outs = [outs] if isinstance(outs, tvm.tensor.Tensor) else outs
    s = tvm.create_schedule([x.op for x in outs])
    scheduled_ops = []

    def traverse(op):
        """inline all one-to-one-mapping operators except the last stage (output)"""
        if tag.is_broadcast(op.tag):
            if op not in s.outputs:
                s[op].compute_inline()
            for tensor in op.input_tensors:
                if tensor.op.input_tensors and tensor.op not in scheduled_ops:
                    traverse(tensor.op)
        if 'conv2d' in op.tag:
            _schedule_cl_spatialpack(s, op)

        scheduled_ops.append(op)

    traverse(outs[0].op)
    return s

def _decl_cl_spatialpack(data, kernel, stride, padding, layout, out_dtype='float16'):
    batch, in_channel, in_height, in_width = [util.get_const_int(x) for x in data.shape]
    num_filter, channel, kernel_h, kernel_w = [util.get_const_int(x) for x in kernel.shape]
    pad_top, pad_left, pad_down, pad_right = get_pad_tuple(padding, kernel)

    if isinstance(stride, (tuple, list)):
        stride_h, stride_w = stride
    else:
        stride_h, stride_w = stride, stride

    out_channel = num_filter
    out_height = simplify((in_height - kernel_h + pad_top + pad_down) // stride_h + 1)
    out_width = simplify((in_width - kernel_w + pad_left + pad_right) // stride_w + 1)
    oshape = (batch, out_channel, out_height, out_width)

    rc = tvm.reduce_axis((0, in_channel), name='rc')
    ry = tvm.reduce_axis((0, kernel_h), name='ry')
    rx = tvm.reduce_axis((0, kernel_w), name='rx')

    block_w = 1
    block_h = 1
    if stride_h == 2:
        if num_filter + kernel_h == 515:
            block_h = 4
            block_w = 4
        else:
            block_h = 4
            block_w = 5
    elif kernel_h == 3:
        if num_filter == 512:
            block_h = 2
            block_w = 7
        else:
            block_h = 2
            block_w = 14
    elif kernel_h == 7 and padding == 3 and stride == 1:
        block_h = 3
        block_w = 4
    else:
        block_h = 1
        block_w = 16

    attrs = {'block_h': block_h, 'block_w' : block_w}
    c_h = out_height
    c_w = out_width

    if not out_width % block_w == 0:
        c_w = (out_width // block_w + 1) * block_w

    if not out_height % block_h == 0:
        c_h = (out_height // block_h + 1) * block_h

    pad_before = [0, 0, pad_top, pad_left]
    pad_after = [0, 0, pad_down + c_h - block_h, pad_right + c_w - block_w]
    temp = pad(data, pad_before, pad_after, name="pad_temp")

    nv = 16
    if not num_filter % nv == 0:
        num_filter = (num_filter // nv + 1) * nv
        out_channel = num_filter

    cshape = (batch, out_channel // nv, c_h, c_w, nv)
    kvshape = (num_filter // nv, channel, kernel_h, kernel_w, nv)

    kernel_vec = tvm.compute(
        kvshape,
        lambda co, ci, kh, kw, vc:
        kernel[co*nv + vc][ci][kh][kw], name='kernel_vec')

    conv = tvm.compute(
        cshape,
        lambda nn, ff, yy, xx, vc:\
          tvm.sum(
              temp[nn, rc, yy * stride_h + ry, xx * stride_w + rx].astype(out_dtype) *
              kernel_vec[ff, rc, ry, rx, vc].astype(out_dtype),
              axis=[rc, ry, rx]), name='conv', attrs=attrs)

    output = tvm.compute(
        oshape,
        lambda nn, ff, yy, xx:
        conv[nn][ff//nv][yy][xx][ff%nv],
        name='output_unpack', tag='conv2d')

    return output

def _schedule_cl_spatialpack(s, op):
    output = op.output(0)
    _, _, out_height, out_width = [util.get_const_int(x) for x in output.shape]

    conv = op.input_tensors[0]
    temp = s[conv].op.input_tensors[0]
    kernel_vec = s[conv].op.input_tensors[1]
    kernel = s[kernel_vec].op.input_tensors[0]
    temp_W = s.cache_read(temp, "warp", [conv])
    conv_L = s.cache_write(conv, "local")

    kernel_L = s.cache_read(kernel_vec, "local", [conv_L])
    _, in_channel, temp_h, temp_w = [util.get_const_int(x) for x in temp.shape]

    attrs = s[conv].op.attrs
    OUTPUT_BLOCK_HEIGHT = attrs['block_h']
    OUTPUT_BLOCK_WIDTH = attrs['block_w']

    # schedule conv
    z_factor = 1
    y_factor = 1
    x_factor = 16
    thread_z = tvm.thread_axis((0, z_factor), "threadIdx.z")
    thread_y = tvm.thread_axis((0, y_factor), "threadIdx.y")
    thread_x = tvm.thread_axis((0, x_factor), "threadIdx.x")
    _, co, oh, ow, vc = s[conv].op.axis
    ooh, ioh = s[conv].split(oh, factor=OUTPUT_BLOCK_HEIGHT)
    oow, iow = s[conv].split(ow, factor=OUTPUT_BLOCK_WIDTH)
    s[conv].reorder(_, co, ooh, oow, vc, ioh, iow)
    coo, coi = s[conv].split(co, nparts=1)
    ooho, oohi = s[conv].split(ooh, factor=z_factor)
    oowo, oowi = s[conv].split(oow, factor=y_factor)
    vco, vci = s[conv].split(vc, factor=x_factor)
    s[conv].reorder(_, coo, vco, ooho, oowo, coi, oohi, oowi, vci, ioh, iow)
    s[conv].bind(oohi, thread_z)
    s[conv].bind(oowi, thread_y)
    s[conv].bind(vci, thread_x)
    s[conv].bind(ooho, tvm.thread_axis("blockIdx.z"))
    s[conv].bind(oowo, tvm.thread_axis("blockIdx.y"))
    s[conv].bind(coi, tvm.thread_axis("blockIdx.x"))

    # schedule conv_L
    s[conv_L].compute_at(s[conv], vci)
    i, oc, h, w, vc = s[conv_L].op.axis
    rc, ry, rx = s[conv_L].op.reduce_axis
    s[conv_L].reorder(i, oc, rc, ry, rx, vc, h, w)
    s[temp_W].compute_at(s[conv_L], rc)
    if kernel.shape[3].value != 7:
        s[conv_L].unroll(ry)
        s[conv_L].unroll(rx)

    # schedule temp
    _, ci, h, w = s[temp].op.axis
    tile_and_bind3d(s, temp, ci, h, w, 1, 16, 16)

    # schedule temp_W
    _, ci, h, w = s[temp_W].op.axis
    zo, zi = s[temp_W].split(ci, 1)
    yo, yi = s[temp_W].split(h, 1)
    xo, xi = s[temp_W].split(w, 16)
    s[temp_W].reorder(zo, yo, xo, zi, yi, xi)
    s[temp_W].bind(zi, thread_z)
    s[temp_W].bind(yi, thread_y)
    s[temp_W].bind(xi, thread_x)
    s[temp_W].storage_align(s[temp_W].op.axis[2], 16, 0)

    s[kernel_vec].compute_inline()

    # schedule kernel_L
    if "2_14" in s[conv].op.tag:
        s[kernel_L].compute_at(s[conv_L], ry)
    else:
        s[kernel_L].compute_at(s[conv_L], rx)

    # schedule output
    if output.op in s.outputs:
        out = output
    else:
        s[output].compute_inline()
        out = s.outputs[0]

    _, co, h, w = s[out].op.axis
    tile_and_bind3d(s, out, w, h, co, 4, 8, 8)
