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#   Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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#
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# 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
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# 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.

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import os

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from paddle.fluid.evaluator import Evaluator
from paddle.fluid.framework import Program, Parameter, default_main_program, Variable
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from . import core
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__all__ = [
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    'save_vars',
    'save_params',
    'save_persistables',
    'load_vars',
    'load_params',
    'load_persistables',
    'save_inference_model',
    'load_inference_model',
    'get_inference_program',
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]


def is_parameter(var):
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    """Check whether the variable is a Parameter.
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    This function checks whether the input variable is a Parameter.

    Args:
        var : The input variable.

    Returns:
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        boolean result whether the variable is a Parameter.
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    """
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    return isinstance(var, Parameter)


def is_persistable(var):
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    if var.desc.type() == core.VarDesc.VarType.FEED_MINIBATCH or \
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            var.desc.type() == core.VarDesc.VarType.FETCH_LIST:
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        return False
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    return var.persistable


def _clone_var_in_block_(block, var):
    assert isinstance(var, Variable)
    return block.create_var(
        name=var.name,
        shape=var.shape,
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        dtype=var.dtype,
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        type=var.type,
        lod_level=var.lod_level,
        persistable=True)


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def save_vars(executor,
              dirname,
              main_program=None,
              vars=None,
              predicate=None,
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              filename=None):
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    """
    Save variables to directory by executor.
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    :param executor: executor that save variable
    :param dirname: directory path
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    :param main_program: program. If vars is None, then filter all variables in this
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    program which fit `predicate`. Default default_main_program.
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    :param predicate: The Predicate describes a callable that returns a variable
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    as a bool. If it returns true, the corresponding input variable will be saved.
    :param vars: variables need to be saved. If vars is specified, program & predicate
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    will be ignored
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    :param filename: The name of a single file that all vars are saved to.
        If it is None, save variables to separate files.
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    :return: None
    """
    if vars is None:
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        if main_program is None:
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            main_program = default_main_program()
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        if not isinstance(main_program, Program):
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            raise TypeError("program should be as Program type or None")

        save_vars(
            executor,
            dirname=dirname,
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            vars=filter(predicate, main_program.list_vars()),
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            filename=filename)
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    else:
        save_program = Program()
        save_block = save_program.global_block()
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        save_var_map = {}
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        for each_var in vars:
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            # NOTE: don't save the variable which type is RAW
            if each_var.type == core.VarDesc.VarType.RAW:
                continue
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            new_var = _clone_var_in_block_(save_block, each_var)
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            if filename is None:
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                save_block.append_op(
                    type='save',
                    inputs={'X': [new_var]},
                    outputs={},
                    attrs={'file_path': os.path.join(dirname, new_var.name)})
            else:
                save_var_map[new_var.name] = new_var

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        if filename is not None:
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            save_var_list = []
            for name in sorted(save_var_map.keys()):
                save_var_list.append(save_var_map[name])

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            save_block.append_op(
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                type='save_combine',
                inputs={'X': save_var_list},
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                outputs={},
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                attrs={'file_path': os.path.join(dirname, filename)})
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        executor.run(save_program)


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def save_params(executor, dirname, main_program=None, filename=None):
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    """
    Save all parameters to directory with executor.
    """
    save_vars(
        executor,
        dirname=dirname,
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        main_program=main_program,
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        vars=None,
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        predicate=is_parameter,
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        filename=filename)
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def save_persistables(executor, dirname, main_program=None, filename=None):
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    """
    Save all persistables to directory with executor.
    """
    save_vars(
        executor,
        dirname=dirname,
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        main_program=main_program,
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        vars=None,
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        predicate=is_persistable,
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        filename=filename)
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def load_vars(executor,
              dirname,
              main_program=None,
              vars=None,
              predicate=None,
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              filename=None):
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    """
    Load variables from directory by executor.
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    :param executor: executor that load variable
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    :param dirname: directory path
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    :param main_program: program. If vars is None, then filter all variables in this
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    program which fit `predicate`. Default default_main_program().
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    :param predicate: The Predicate describes a callable that returns a variable
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    as a bool. If it returns true, the corresponding input variable will be loaded.
    :param vars: variables need to be loaded. If vars is specified, program &
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    predicate will be ignored
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    :param filename: The name of the single file that all vars are loaded from.
        If it is None, load variables from separate files.
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    :return: None
    """
    if vars is None:
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        if main_program is None:
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            main_program = default_main_program()
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        if not isinstance(main_program, Program):
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            raise TypeError("program's type should be Program")

        load_vars(
            executor,
            dirname=dirname,
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            vars=filter(predicate, main_program.list_vars()),
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            filename=filename)
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    else:
        load_prog = Program()
        load_block = load_prog.global_block()
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        load_var_map = {}
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        for each_var in vars:
            assert isinstance(each_var, Variable)
            new_var = _clone_var_in_block_(load_block, each_var)
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            if filename is None:
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                load_block.append_op(
                    type='load',
                    inputs={},
                    outputs={'Out': [new_var]},
                    attrs={'file_path': os.path.join(dirname, new_var.name)})
            else:
                load_var_map[new_var.name] = new_var

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        if filename is not None:
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            load_var_list = []
            for name in sorted(load_var_map.keys()):
                load_var_list.append(load_var_map[name])

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            load_block.append_op(
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                type='load_combine',
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                inputs={},
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                outputs={"Out": load_var_list},
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                attrs={'file_path': os.path.join(dirname, filename)})
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        executor.run(load_prog)


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def load_params(executor, dirname, main_program=None, filename=None):
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    """
    load all parameters from directory by executor.
    """
    load_vars(
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        executor,
        dirname=dirname,
        main_program=main_program,
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        predicate=is_parameter,
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        filename=filename)
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def load_persistables(executor, dirname, main_program=None, filename=None):
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    """
    load all persistables from directory by executor.
    """
    load_vars(
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        executor,
        dirname=dirname,
        main_program=main_program,
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        predicate=is_persistable,
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        filename=filename)
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def get_inference_program(target_vars, main_program=None):
    if main_program is None:
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        main_program = default_main_program()
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    if not isinstance(target_vars, list):
        target_vars = [target_vars]
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    vars = []
    for var in target_vars:
        if isinstance(var, Evaluator):
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            vars.extend(var.states)
            vars.extend(var.metrics)
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        else:
            vars.append(var)
    pruned_program = main_program.prune(targets=vars)
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    inference_program = pruned_program.inference_optimize()
    return inference_program


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def prepend_feed_ops(inference_program,
                     feed_target_names,
                     feed_holder_name='feed'):
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    if len(feed_target_names) == 0:
        return

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    global_block = inference_program.global_block()
    feed_var = global_block.create_var(
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        name=feed_holder_name,
        type=core.VarDesc.VarType.FEED_MINIBATCH,
        persistable=True)
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    for i, name in enumerate(feed_target_names):
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        out = global_block.var(name)
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        global_block.prepend_op(
            type='feed',
            inputs={'X': [feed_var]},
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            outputs={'Out': [out]},
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            attrs={'col': i})


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def append_fetch_ops(inference_program,
                     fetch_target_names,
                     fetch_holder_name='fetch'):
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    global_block = inference_program.global_block()
    fetch_var = global_block.create_var(
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        name=fetch_holder_name,
        type=core.VarDesc.VarType.FETCH_LIST,
        persistable=True)
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    for i, name in enumerate(fetch_target_names):
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        global_block.append_op(
            type='fetch',
            inputs={'X': [name]},
            outputs={'Out': [fetch_var]},
            attrs={'col': i})


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def save_inference_model(dirname,
                         feeded_var_names,
                         target_vars,
                         executor,
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                         main_program=None,
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                         model_filename=None,
                         params_filename=None):
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    """
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    Build a model especially for inference,
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    and save it to directory by the executor.

    :param dirname: directory path
    :param feeded_var_names: Names of variables that need to be feeded data during inference
    :param target_vars: Variables from which we can get inference results.
    :param executor: executor that save inference model
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    :param main_program: original program, which will be pruned to build the inference model.
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            Default default_main_program().
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    :param model_filename: The name of file to save inference program.
        If not specified, default filename `__model__` will be used.
    :param params_filename: The name of file to save parameters.
        It is used for the case that all parameters are saved in a single binary file.
        If not specified, parameters are considered saved in separate files.
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    :return: None
    """
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    if isinstance(feeded_var_names, basestring):
        feeded_var_names = [feeded_var_names]
    else:
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        if len(feeded_var_names) > 0:
            if not (bool(feeded_var_names) and all(
                    isinstance(name, basestring) for name in feeded_var_names)):
                raise ValueError("'feed_var_names' should be a list of str.")
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    if isinstance(target_vars, Variable):
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        target_vars = [target_vars]
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    else:
        if not (bool(target_vars) and all(
                isinstance(var, Variable) for var in target_vars)):
            raise ValueError("'target_vars' should be a list of Variable.")

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    if main_program is None:
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        main_program = default_main_program()
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    copy_program = main_program.clone()
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    if not os.path.isdir(dirname):
        os.makedirs(dirname)

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    # Clear the is_target information and remove the existed feed and fetch op
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    global_block = copy_program.global_block()
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    for i, op in enumerate(global_block.ops):
        op.desc.set_is_target(False)
        if op.type == "feed" or op.type == "fetch":
            global_block.remove_op(i)
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    copy_program.desc.flush()
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    pruned_program = copy_program.prune(targets=target_vars)
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    inference_program = pruned_program.inference_optimize()
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    fetch_var_names = [v.name for v in target_vars]

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    prepend_feed_ops(inference_program, feeded_var_names)
    append_fetch_ops(inference_program, fetch_var_names)
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    if model_filename is not None:
        model_filename = os.path.basename(model_filename)
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    else:
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        model_filename = "__model__"
    model_filename = os.path.join(dirname, model_filename)
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    if params_filename is not None:
        params_filename = os.path.basename(params_filename)

    with open(model_filename, "wb") as f:
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        f.write(inference_program.desc.serialize_to_string())
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    save_persistables(executor, dirname, inference_program, params_filename)
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def load_inference_model(dirname,
                         executor,
                         model_filename=None,
                         params_filename=None):
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    """
    Load inference model from a directory

    :param dirname: directory path
    :param executor: executor that load inference model
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    :param model_filename: The name of file to load inference program.
        If not specified, default filename `__model__` will be used.
    :param params_filename: The name of file to load parameters.
        It is used for the case that all parameters are saved in a single binary file.
        If not specified, parameters are considered saved in separate files.

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    :return: [program, feed_target_names, fetch_targets]
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             program: program especially for inference.
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             feed_target_names: Names of variables that need to feed data
             fetch_targets: Variables from which we can get inference results.
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    """
    if not os.path.isdir(dirname):
        raise ValueError("There is no directory named '%s'", dirname)

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    if model_filename is not None:
        model_filename = os.path.basename(model_filename)
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    else:
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        model_filename = "__model__"
    model_filename = os.path.join(dirname, model_filename)

    if params_filename is not None:
        params_filename = os.path.basename(params_filename)
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    with open(model_filename, "rb") as f:
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        program_desc_str = f.read()

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    program = Program.parse_from_string(program_desc_str)
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    load_persistables(executor, dirname, program, params_filename)
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    feed_target_names = program.desc.get_feed_target_names()
    fetch_target_names = program.desc.get_fetch_target_names()
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    fetch_targets = [
        program.global_block().var(name) for name in fetch_target_names
    ]

    return [program, feed_target_names, fetch_targets]
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def get_parameter_value(para, executor):
    """
    Get the LoDTensor for the parameter

    :param executor: executor for retrieving the value
    :param para: the given parameter
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    :return: the LoDTensor for the parameter
    """
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    assert is_parameter(para)

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    get_program = Program()
    block = get_program.global_block()
    new_var = _clone_var_in_block_(block, para)
    return executor.run(get_program, feed={}, fetch_list=[new_var])[0]


def get_parameter_value_by_name(name, executor, program=None):
    """
    Get the LoDTensor for paramter with the given name

    :param executor: executor for retrieving the value
    :param name: the name of the parameter
    :param program: the program where the variable is found
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            Default default_main_program().
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    :return: the LoDTensor for the variable
    """
    if program is None:
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        program = default_main_program()
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    var = program.global_block().var(name)
    return get_parameter_value(var, executor)