# Copyright (c) 2016 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.

from paddle.utils.image_util import *
import random
from PIL import Image
from PIL import ImageDraw
import numpy as np
import xml.etree.ElementTree
import os
import time
import copy
import six
from collections import deque

from roidbs import JsonDataset
import data_utils


class Settings(object):
    def __init__(self, args=None):
        for arg, value in sorted(six.iteritems(vars(args))):
            setattr(self, arg, value)

        if 'coco2014' in args.dataset:
            self.class_nums = 81
            self.train_file_list = 'annotations/instances_train2014.json'
            self.train_data_dir = 'train2014'
            self.val_file_list = 'annotations/instances_val2014.json'
            self.val_data_dir = 'val2014'
        elif 'coco2017' in args.dataset:
            self.class_nums = 81
            self.train_file_list = 'annotations/instances_train2017.json'
            self.train_data_dir = 'train2017'
            self.val_file_list = 'annotations/instances_val2017.json'
            self.val_data_dir = 'val2017'
        else:
            raise NotImplementedError('Dataset {} not supported'.format(
                self.dataset))
        self.mean_value = np.array(self.mean_value)[
            np.newaxis, np.newaxis, :].astype('float32')


def coco(settings, mode, batch_size=None, shuffle=False):
    if mode == 'train':
        settings.train_file_list = os.path.join(settings.data_dir,
                                                settings.train_file_list)
        settings.train_data_dir = os.path.join(settings.data_dir,
                                               settings.train_data_dir)
    elif mode == 'test':
        settings.val_file_list = os.path.join(settings.data_dir,
                                              settings.val_file_list)
        settings.val_data_dir = os.path.join(settings.data_dir,
                                             settings.val_data_dir)
    json_dataset = JsonDataset(settings, train=(mode == 'train'))
    roidbs = json_dataset.get_roidb()

    print("{} on {} with {} roidbs".format(mode, settings.dataset, len(roidbs)))

    def roidb_reader(roidb):
        im, im_scales = data_utils.get_image_blob(roidb, settings)
        im_id = roidb['id']
        im_height = np.round(roidb['height'] * im_scales)
        im_width = np.round(roidb['width'] * im_scales)
        im_info = np.array([im_height, im_width, im_scales], dtype=np.float32)
        gt_boxes = roidb['gt_boxes'].astype('float32')
        gt_classes = roidb['gt_classes'].astype('int32')
        is_crowd = roidb['is_crowd'].astype('int32')
        return im, gt_boxes, gt_classes, is_crowd, im_info, im_id

    def reader():
        if mode == "train":
            roidb_perm = deque(np.random.permutation(roidbs))
            roidb_cur = 0
            batch_out = []
            while True:
                roidb = roidb_perm[0]
                roidb_cur += 1
                roidb_perm.rotate(-1)
                if roidb_cur >= len(roidbs):
                    roidb_perm = deque(np.random.permutation(roidbs))
                im, gt_boxes, gt_classes, is_crowd, im_info, im_id = roidb_reader(
                    roidb)
                if gt_boxes.shape[0] == 0:
                    continue
                batch_out.append(
                    (im, gt_boxes, gt_classes, is_crowd, im_info, im_id))
                if len(batch_out) == batch_size:
                    yield batch_out
                    batch_out = []
        else:
            batch_out = []
            for roidb in roidbs:
                im, gt_boxes, gt_classes, is_crowd, im_info, im_id = roidb_reader(
                    roidb)
                batch_out.append(
                    (im, gt_boxes, gt_classes, is_crowd, im_info, im_id))
                if len(batch_out) == batch_size:
                    yield batch_out
                    batch_out = []

    return reader


def train(settings, batch_size, shuffle=True):
    return coco(settings, 'train', batch_size, shuffle)


def test(settings, batch_size):
    return coco(settings, 'test', batch_size, shuffle=False)