# -*- coding: utf-8 -*-
# @Time    : 2019/8/23 21:54
# @Author  : zhoujun
import pathlib
import os
import cv2
import numpy as np
import scipy.io as sio
from tqdm.auto import tqdm

from base import BaseDataSet
from utils import order_points_clockwise, get_datalist, load, expand_polygon


class ICDAR2015Dataset(BaseDataSet):
    def __init__(self,
                 data_path: str,
                 img_mode,
                 pre_processes,
                 filter_keys,
                 ignore_tags,
                 transform=None,
                 **kwargs):
        super().__init__(data_path, img_mode, pre_processes, filter_keys,
                         ignore_tags, transform)

    def load_data(self, data_path: str) -> list:
        data_list = get_datalist(data_path)
        t_data_list = []
        for img_path, label_path in data_list:
            data = self._get_annotation(label_path)
            if len(data['text_polys']) > 0:
                item = {
                    'img_path': img_path,
                    'img_name': pathlib.Path(img_path).stem
                }
                item.update(data)
                t_data_list.append(item)
            else:
                print('there is no suit bbox in {}'.format(label_path))
        return t_data_list

    def _get_annotation(self, label_path: str) -> dict:
        boxes = []
        texts = []
        ignores = []
        with open(label_path, encoding='utf-8', mode='r') as f:
            for line in f.readlines():
                params = line.strip().strip('\ufeff').strip(
                    '\xef\xbb\xbf').split(',')
                try:
                    box = order_points_clockwise(
                        np.array(list(map(float, params[:8]))).reshape(-1, 2))
                    if cv2.contourArea(box) > 0:
                        boxes.append(box)
                        label = params[8]
                        texts.append(label)
                        ignores.append(label in self.ignore_tags)
                except:
                    print('load label failed on {}'.format(label_path))
        data = {
            'text_polys': np.array(boxes),
            'texts': texts,
            'ignore_tags': ignores,
        }
        return data


class DetDataset(BaseDataSet):
    def __init__(self,
                 data_path: str,
                 img_mode,
                 pre_processes,
                 filter_keys,
                 ignore_tags,
                 transform=None,
                 **kwargs):
        self.load_char_annotation = kwargs['load_char_annotation']
        self.expand_one_char = kwargs['expand_one_char']
        super().__init__(data_path, img_mode, pre_processes, filter_keys,
                         ignore_tags, transform)

    def load_data(self, data_path: str) -> list:
        """
        从json文件中读取出 文本行的坐标和gt，字符的坐标和gt
        :param data_path:
        :return:
        """
        data_list = []
        for path in data_path:
            content = load(path)
            for gt in tqdm(
                    content['data_list'], desc='read file {}'.format(path)):
                img_path = os.path.join(content['data_root'], gt['img_name'])
                polygons = []
                texts = []
                illegibility_list = []
                language_list = []
                for annotation in gt['annotations']:
                    if len(annotation['polygon']) == 0 or len(annotation[
                            'text']) == 0:
                        continue
                    if len(annotation['text']) > 1 and self.expand_one_char:
                        annotation['polygon'] = expand_polygon(annotation[
                            'polygon'])
                    polygons.append(annotation['polygon'])
                    texts.append(annotation['text'])
                    illegibility_list.append(annotation['illegibility'])
                    language_list.append(annotation['language'])
                    if self.load_char_annotation:
                        for char_annotation in annotation['chars']:
                            if len(char_annotation['polygon']) == 0 or len(
                                    char_annotation['char']) == 0:
                                continue
                            polygons.append(char_annotation['polygon'])
                            texts.append(char_annotation['char'])
                            illegibility_list.append(char_annotation[
                                'illegibility'])
                            language_list.append(char_annotation['language'])
                data_list.append({
                    'img_path': img_path,
                    'img_name': gt['img_name'],
                    'text_polys': np.array(polygons),
                    'texts': texts,
                    'ignore_tags': illegibility_list
                })
        return data_list


class SynthTextDataset(BaseDataSet):
    def __init__(self,
                 data_path: str,
                 img_mode,
                 pre_processes,
                 filter_keys,
                 transform=None,
                 **kwargs):
        self.transform = transform
        self.dataRoot = pathlib.Path(data_path)
        if not self.dataRoot.exists():
            raise FileNotFoundError('Dataset folder is not exist.')

        self.targetFilePath = self.dataRoot / 'gt.mat'
        if not self.targetFilePath.exists():
            raise FileExistsError('Target file is not exist.')
        targets = {}
        sio.loadmat(
            self.targetFilePath,
            targets,
            squeeze_me=True,
            struct_as_record=False,
            variable_names=['imnames', 'wordBB', 'txt'])

        self.imageNames = targets['imnames']
        self.wordBBoxes = targets['wordBB']
        self.transcripts = targets['txt']
        super().__init__(data_path, img_mode, pre_processes, filter_keys,
                         transform)

    def load_data(self, data_path: str) -> list:
        t_data_list = []
        for imageName, wordBBoxes, texts in zip(
                self.imageNames, self.wordBBoxes, self.transcripts):
            item = {}
            wordBBoxes = np.expand_dims(
                wordBBoxes, axis=2) if (wordBBoxes.ndim == 2) else wordBBoxes
            _, _, numOfWords = wordBBoxes.shape
            text_polys = wordBBoxes.reshape(
                [8, numOfWords], order='F').T  # num_words * 8
            text_polys = text_polys.reshape(numOfWords, 4,
                                            2)  # num_of_words * 4 * 2
            transcripts = [word for line in texts for word in line.split()]
            if numOfWords != len(transcripts):
                continue
            item['img_path'] = str(self.dataRoot / imageName)
            item['img_name'] = (self.dataRoot / imageName).stem
            item['text_polys'] = text_polys
            item['texts'] = transcripts
            item['ignore_tags'] = [x in self.ignore_tags for x in transcripts]
            t_data_list.append(item)
        return t_data_list