#   Copyright (c) 2019  PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


def gen_codes(code_list, indent=0):
    indent_blank = "    " * indent
    codes = []
    for code_line in code_list:
        if code_line.strip() == "":
            codes.append('\n')
        else:
            codes.append(indent_blank + code_line + '\n')
    return codes


def get_value(layer, key):
    """ 进行optimizer后可能把inputs的value直接用数值代替（ConstantFuser），
        会把input换成attr，所以需要此处的操作。
    """
    if key in layer.inputs:
        return layer.inputs[key]
    else:
        return str(layer.attrs[key])


def prim_add(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} + {}".format(layer.outputs[0],
                                 get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_add_(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} + {} * {}".format(layer.outputs[0],
                                      get_value(layer, "x"),
                                      layer.attrs["alpha"],
                                      get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_and(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} and {}".format(layer.outputs[0],
                                   get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_append(layer, indent=1, init_func=[], forward_func=[]):
    line = "{}.append({})".format(
        get_value(layer, "list"), get_value(layer, "element"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_assert(layer, indent=1, init_func=[], forward_func=[]):
    if layer.attrs["type"] == "eq":
        if isinstance(layer.attrs["value"], list):
            s = ""
            for v in layer.attrs["value"]:
                s += "{} == {} or ".format(layer.attrs["key"], v)
            if len(s) > 0:
                s = s[:-4]
            line = "assert {}, \'The {} must be {}!\'".format(
                s, layer.attrs["key"], layer.attrs["value"])
        else:
            line = "assert {} == {}, \'The {} must be {}!\'".format(
                layer.attrs["key"], layer.attrs["value"], layer.attrs["key"],
                layer.attrs["value"])
    else:
        raise Exception("Not implement yet!")
    forward_func.extend(gen_codes([line], indent=indent))


def prim_constant(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {}".format(layer.outputs[0], layer.attrs["value"])
    forward_func.extend(gen_codes([line], indent=indent))


def prim_eq(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} == {}".format(layer.outputs[0],
                                  get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_equal(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {}".format(layer.outputs[0], get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_exception(layer, indent=1, init_func=[], forward_func=[]):
    line = "raise RaiseException({})".format(get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_if(layer, indent=1, init_func=[], forward_func=[]):
    line = "if {} :".format(get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))
    block = layer.blocks[0]
    b_init_lines, b_forward_lines = block.gen_dygraph_code(indent=indent + 1)
    init_func.extend(b_init_lines)
    forward_func.extend(b_forward_lines)
    block = layer.blocks[1]
    if len(block.layers) > 0:
        line = "else:"
        forward_func.extend(gen_codes([line], indent=indent))
        b_init_lines, b_forward_lines = block.gen_dygraph_code(
            indent=indent + 1)
        init_func.extend(b_init_lines)
        forward_func.extend(b_forward_lines)


def prim_getitem(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {}[{}]".format(layer.outputs[0],
                                get_value(layer, "list"),
                                get_value(layer, "index"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_gt(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} > {}".format(layer.outputs[0],
                                 get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_le(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} <= {}".format(layer.outputs[0],
                                  get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_len(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = len({})".format(layer.outputs[0], get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_lt(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} < {}".format(layer.outputs[0],
                                 get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_list(layer, indent=1, init_func=[], forward_func=[]):
    input_len = len(layer.inputs) + len(layer.attrs)
    inputs_list = list()
    for i in range(input_len):
        inputs_list.append(get_value(layer, "input{}".format(i)))
    inputs_str = ', '.join(inputs_list)
    line = "{} = [{}]".format(layer.outputs[0], inputs_str)
    forward_func.extend(gen_codes([line], indent=indent))


def prim_loop(layer, indent=1, init_func=[], forward_func=[]):
    loop_range = get_value(layer, "input")
    line = "for {} in range({}):".format(layer.outputs[1], loop_range)
    forward_func.extend(gen_codes([line], indent=indent))
    block = layer.blocks[0]
    b_init_lines, b_forward_lines = block.gen_dygraph_code(indent=indent + 1)
    init_func.extend(b_init_lines)
    forward_func.extend(b_forward_lines)


def prim_min(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = min({})".format(layer.outputs[0], get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_mul(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} * {}".format(layer.outputs[0],
                                 get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_ne(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} < {}".format(layer.outputs[0],
                                 get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_neg(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = -{}".format(layer.outputs[0], get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_not(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = not {}".format(layer.outputs[0], get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_requires_grad(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = not {}.stop_gradient".format(layer.outputs[0],
                                              get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_select(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {}[".format(layer.outputs[0], get_value(layer, "input"))
    for dim in range(layer.attrs["dim"]):
        line += ":, "
    line += (get_value(layer, "index") + "]")
    forward_func.extend(gen_codes([line], indent=indent))


def prim_shape(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {}.shape".format(layer.outputs[0], get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_slice(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {}[{}: {}: {}]".format(layer.outputs[0],
                                        get_value(layer, "input"),
                                        get_value(layer, "start"),
                                        get_value(layer, "end"),
                                        get_value(layer, "step"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_sub(layer, indent=1, init_func=[], forward_func=[]):
    line = "{} = {} - {}".format(layer.outputs[0],
                                 get_value(layer, "x"), get_value(layer, "y"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_tuple(layer, indent=1, init_func=[], forward_func=[]):
    input_len = len(layer.inputs) + len(layer.attrs)
    inputs_list = list()
    for i in range(input_len):
        inputs_list.append(get_value(layer, "input{}".format(i)))
    inputs_str = ', '.join(inputs_list)
    line = "{} = ({})".format(layer.outputs[0], inputs_str)
    forward_func.extend(gen_codes([line], indent=indent))


def prim_tuple_unpack(layer, indent=1, init_func=[], forward_func=[]):
    outputs_str = ', '.join(layer.outputs)
    line = "{} = {}".format(outputs_str, get_value(layer, "input"))
    forward_func.extend(gen_codes([line], indent=indent))


def prim_warnings(layer, indent=1, init_func=[], forward_func=[]):
    lines = ["import warnings"]
    line = "warnings.warn({}, stacklevel={})".format(
        get_value(layer, "input"), layer.attrs["stacklevel"])
    lines.append(line)
    forward_func.extend(gen_codes(lines, indent=indent))