import os
import sys
import logging
import paddle
import argparse
import functools
import math
import time
import numpy as np
import paddle.fluid as fluid
from paddleslim.prune import merge_sensitive, get_ratios_by_loss
from paddleslim.prune import sensitivity
from paddleslim.common import get_logger
sys.path[0] = os.path.join(os.path.dirname("__file__"), os.path.pardir)
import models
from utility import add_arguments, print_arguments

_logger = get_logger(__name__, level=logging.INFO)

parser = argparse.ArgumentParser(description=__doc__)
add_arg = functools.partial(add_arguments, argparser=parser)
# yapf: disable
add_arg('batch_size',       int,  64 * 4,                 "Minibatch size.")
add_arg('use_gpu',          bool, True,                "Whether to use GPU or not.")
add_arg('model',            str,  "MobileNet",                "The target model.")
add_arg('pretrained_model', str,  "../pretrained_model/MobileNetV1_pretained",                "Whether to use pretrained model.")
add_arg('data',             str, "mnist",                 "Which data to use. 'mnist' or 'imagenet'")
add_arg('log_period',       int, 10,                 "Log period in batches.")
# yapf: enable

model_list = [m for m in dir(models) if "__" not in m]


def compress(args):
    test_reader = None
    if args.data == "mnist":
        import paddle.dataset.mnist as reader
        val_reader = reader.test()
        class_dim = 10
        image_shape = "1,28,28"
    elif args.data == "imagenet":
        import imagenet_reader as reader
        val_reader = reader.val()
        class_dim = 1000
        image_shape = "3,224,224"
    else:
        raise ValueError("{} is not supported.".format(args.data))
    image_shape = [int(m) for m in image_shape.split(",")]
    assert args.model in model_list, "{} is not in lists: {}".format(
        args.model, model_list)
    image = fluid.layers.data(name='image', shape=image_shape, dtype='float32')
    label = fluid.layers.data(name='label', shape=[1], dtype='int64')
    # model definition
    model = models.__dict__[args.model]()
    out = model.net(input=image, class_dim=class_dim)
    acc_top1 = fluid.layers.accuracy(input=out, label=label, k=1)
    acc_top5 = fluid.layers.accuracy(input=out, label=label, k=5)
    val_program = fluid.default_main_program().clone(for_test=True)
    place = fluid.CUDAPlace(0) if args.use_gpu else fluid.CPUPlace()
    exe = fluid.Executor(place)
    exe.run(fluid.default_startup_program())

    if args.pretrained_model:

        def if_exist(var):
            return os.path.exists(
                os.path.join(args.pretrained_model, var.name))

        fluid.io.load_vars(exe, args.pretrained_model, predicate=if_exist)

    val_reader = paddle.fluid.io.batch(val_reader, batch_size=args.batch_size)

    val_feeder = feeder = fluid.DataFeeder(
        [image, label], place, program=val_program)

    def test(program):
        batch_id = 0
        acc_top1_ns = []
        acc_top5_ns = []
        for data in val_reader():
            start_time = time.time()
            acc_top1_n, acc_top5_n = exe.run(
                program,
                feed=val_feeder.feed(data),
                fetch_list=[acc_top1.name, acc_top5.name])
            end_time = time.time()
            if batch_id % args.log_period == 0:
                _logger.info(
                    "Eval batch[{}] - acc_top1: {}; acc_top5: {}; time: {}".
                    format(batch_id,
                           np.mean(acc_top1_n),
                           np.mean(acc_top5_n), end_time - start_time))
            acc_top1_ns.append(np.mean(acc_top1_n))
            acc_top5_ns.append(np.mean(acc_top5_n))
            batch_id += 1

        _logger.info("Final eva - acc_top1: {}; acc_top5: {}".format(
            np.mean(np.array(acc_top1_ns)), np.mean(np.array(acc_top5_ns))))
        return np.mean(np.array(acc_top1_ns))

    params = []
    for param in fluid.default_main_program().global_block().all_parameters():
        if "_sep_weights" in param.name:
            params.append(param.name)

    sensitivity(
        val_program,
        place,
        params,
        test,
        sensitivities_file="sensitivities_0.data",
        pruned_ratios=[0.1, 0.2, 0.3, 0.4])

    sensitivity(
        val_program,
        place,
        params,
        test,
        sensitivities_file="sensitivities_1.data",
        pruned_ratios=[0.5, 0.6, 0.7])

    sens = merge_sensitive(
        ["./sensitivities_0.data", "./sensitivities_1.data"])

    ratios = get_ratios_by_loss(sens, 0.01)

    print ratios


def main():
    args = parser.parse_args()
    print_arguments(args)
    compress(args)


if __name__ == '__main__':
    main()