import argparse
import pprint
import mxnet as mx

from ..logger import logger
from ..config import config, default, generate_config
from ..symbol import *
from ..dataset import *
from ..core.loader import TestLoader
from ..core.tester import Predictor, pred_eval
from ..utils.load_model import load_param


def test_rcnn(network, dataset, image_set, root_path, dataset_path, ctx,
              prefix, epoch, vis, shuffle, has_rpn, proposal, thresh):
    # set config
    if has_rpn:
        config.TEST.HAS_RPN = True

    # print config
    logger.info(pprint.pformat(config))

    # load symbol and testing data
    if has_rpn:
        sym = eval('get_' + network + '_test')(num_classes=config.NUM_CLASSES,
                                               num_anchors=config.NUM_ANCHORS)
        imdb = eval(dataset)(image_set, root_path, dataset_path)
        roidb = imdb.gt_roidb()
    else:
        sym = eval('get_' + network +
                   '_rcnn_test')(num_classes=config.NUM_CLASSES)
        imdb = eval(dataset)(image_set, root_path, dataset_path)
        gt_roidb = imdb.gt_roidb()
        roidb = eval('imdb.' + proposal + '_roidb')(gt_roidb)

    # get test data iter
    test_data = TestLoader(roidb,
                           batch_size=1,
                           shuffle=shuffle,
                           has_rpn=has_rpn)

    # load model
    arg_params, aux_params = load_param(prefix,
                                        epoch,
                                        convert=True,
                                        ctx=ctx,
                                        process=True)

    # infer shape
    data_shape_dict = dict(test_data.provide_data)
    arg_shape, _, aux_shape = sym.infer_shape(**data_shape_dict)
    arg_shape_dict = dict(zip(sym.list_arguments(), arg_shape))
    aux_shape_dict = dict(zip(sym.list_auxiliary_states(), aux_shape))

    # check parameters
    for k in sym.list_arguments():
        if k in data_shape_dict or 'label' in k:
            continue
        assert k in arg_params, k + ' not initialized'
        assert arg_params[k].shape == arg_shape_dict[k], \
            'shape inconsistent for ' + k + ' inferred ' + str(arg_shape_dict[k]) + ' provided ' + str(arg_params[k].shape)
    for k in sym.list_auxiliary_states():
        assert k in aux_params, k + ' not initialized'
        assert aux_params[k].shape == aux_shape_dict[k], \
            'shape inconsistent for ' + k + ' inferred ' + str(aux_shape_dict[k]) + ' provided ' + str(aux_params[k].shape)

    # decide maximum shape
    data_names = [k[0] for k in test_data.provide_data]
    label_names = None
    max_data_shape = [('data', (1, 3, max([v[0] for v in config.SCALES]),
                                max([v[1] for v in config.SCALES])))]
    if not has_rpn:
        max_data_shape.append(
            ('rois', (1, config.TEST.PROPOSAL_POST_NMS_TOP_N + 30, 5)))

    # create predictor
    predictor = Predictor(sym,
                          data_names,
                          label_names,
                          context=ctx,
                          max_data_shapes=max_data_shape,
                          provide_data=test_data.provide_data,
                          provide_label=test_data.provide_label,
                          arg_params=arg_params,
                          aux_params=aux_params)

    # start detection
    pred_eval(predictor, test_data, imdb, vis=vis, thresh=thresh)


def parse_args():
    parser = argparse.ArgumentParser(description='Test a Fast R-CNN network')
    # general
    parser.add_argument('--network',
                        help='network name',
                        default=default.network,
                        type=str)
    parser.add_argument('--dataset',
                        help='dataset name',
                        default=default.dataset,
                        type=str)
    args, rest = parser.parse_known_args()
    generate_config(args.network, args.dataset)
    parser.add_argument('--image_set',
                        help='image_set name',
                        default=default.test_image_set,
                        type=str)
    parser.add_argument('--root_path',
                        help='output data folder',
                        default=default.root_path,
                        type=str)
    parser.add_argument('--dataset_path',
                        help='dataset path',
                        default=default.dataset_path,
                        type=str)
    # testing
    parser.add_argument('--prefix',
                        help='model to test with',
                        default=default.rcnn_prefix,
                        type=str)
    parser.add_argument('--epoch',
                        help='model to test with',
                        default=default.rcnn_epoch,
                        type=int)
    parser.add_argument('--gpu',
                        help='GPU device to test with',
                        default=0,
                        type=int)
    # rcnn
    parser.add_argument('--vis',
                        help='turn on visualization',
                        action='store_true')
    parser.add_argument('--thresh',
                        help='valid detection threshold',
                        default=1e-3,
                        type=float)
    parser.add_argument('--shuffle',
                        help='shuffle data on visualization',
                        action='store_true')
    parser.add_argument('--has_rpn',
                        help='generate proposals on the fly',
                        action='store_true')
    parser.add_argument('--proposal',
                        help='can be ss for selective search or rpn',
                        default='rpn',
                        type=str)
    args = parser.parse_args()
    return args


def main():
    args = parse_args()
    logger.info('Called with argument: %s' % args)
    ctx = mx.gpu(args.gpu)
    test_rcnn(args.network, args.dataset, args.image_set, args.root_path,
              args.dataset_path, ctx, args.prefix, args.epoch, args.vis,
              args.shuffle, args.has_rpn, args.proposal, args.thresh)


if __name__ == '__main__':
    main()