# coding=utf-8
'''DiaBLA: "Dialogue Bilingue" Bilingual dialogue dataset'''

import json
import datasets

logger = datasets.logging.get_logger(__name__)

_CITATION = '''\
@article{bawden_DiaBLa:-A-Corpus-of_2021,
  author = {Bawden, Rachel and Bilinski, Eric and Lavergne, Thomas and Rosset, Sophie},
  doi = {10.1007/s10579-020-09514-4},
  title = {DiaBLa: A Corpus of Bilingual Spontaneous Written Dialogues for Machine Translation},
  year = {2021},
  journal = {Language Resources and Evaluation},
  publisher = {Springer Verlag},
  volume = {55},
  pages = {635--660},
  url = {https://hal.inria.fr/hal-03021633},
  pdf = {https://hal.inria.fr/hal-03021633/file/diabla-lre-personal-formatting.pdf},
}
'''

_DESCRIPTION = '''\
English-French parallel dataset for the evaluation of \
Machine Translation (MT) for informal, written bilingual dialogue.
'''
 
_URLS = {
    'test': 'DiaBLa.json',
}


class DiablaConfig(datasets.BuilderConfig):
    '''BuilderConfig for DiaBLa.'''

    def __init__(self, **kwargs):
        """BuilderConfig for DiaBLa.

        Args:
          **kwargs: keyword arguments forwarded to super.
        """
        super(DiablaConfig, self).__init__(**kwargs)


class Diabla(datasets.GeneratorBasedBuilder):
    '''DiaBLa: English-French parallel dataset of bilingual dialogue'''

    BUILDER_CONFIGS = [
        DiablaConfig(
            name='plain_text',
            version=datasets.Version('1.0.0', ''),
            description='Plain text',
        ),
    ]

    #TODO
    def _info(self):
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=datasets.Features(
                {
                    'id': datasets.Value('string'),
                    'orig': datasets.Value('string'),
                    'norm': datasets.Value('string'),
                    'mt': datasets.Value('string'),
                    'ref': datasets.Value('string'),
                    'utterance_meta': {
                        'eval_judgment': datasets.Value("string"),
                        'eval_verbatim': datasets.Value('string'),
                        'eval_problems': [
                            datasets.Value("string")
                         ],
                        'lang': datasets.Value("string")
                    },
                    'dialogue_meta': {
                        'start_time': datasets.Value('string'), 
                        'end_time' : datasets.Value('string'),
                        'translation_model': datasets.Value('string'),
                        'final_evaluation_user1': {
                            'style': datasets.Value("string"), 
                            'coherence': datasets.Value("string"),                            
                            'grammaticality': datasets.Value("string"), 
                            'meaning': datasets.Value("string"), 
                            'word_choice': datasets.Value("string"), 
                         },
                        'final_evaluation_user2': {
                            'style': datasets.Value("string"), 
                            'coherence': datasets.Value("string"), 
                            'grammaticality': datasets.Value("string"), 
                            'meaning': datasets.Value("string"), 
                            'word_choice': datasets.Value("string"),
                         },
                         'scenario': [[
                                     datasets.Value("string")
                             ]],
                        'user1': {
                               'role_num': datasets.Value('int64'),
                               'role':[ 
                                       datasets.Value('string')
                                ],
                               'initiated_dialogue': datasets.Value('bool'),                                 
                               'turn_number': datasets.Value('int64'),
                               'lang': datasets.Value("string"), 
                         },
                        'user2':{
                               'role_num': datasets.Value('int64'),
                               'role':[ 
                                       datasets.Value('string')
                                ],
                               'initiated_dialogue': datasets.Value('bool'),
                               'turn_number': datasets.Value('int64'),
                               'lang': datasets.Value("string"), 
                         }
                     },
                    'dialogue_history': [
                        {
                            'id': datasets.Value('string'),
                            'orig': datasets.Value('string'),
                            'norm': datasets.Value('string'),
                            'mt': datasets.Value('string'),
                            'ref': datasets.Value('string'),
                            'utterance_meta': {
                                'eval_judgment': datasets.Value("string"),  
                                'eval_verbatim': datasets.Value("string"),
                                'eval_problems': [
                                    datasets.Value("string")
                                 ],
                                'lang': datasets.Value("string"), 
                            }                        
                        }
                    ]
                }
            ),
            supervised_keys=None,
            homepage='https://github.com/rbawden/DiaBLa-dataset',
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager):
        downloaded_files = dl_manager.download_and_extract(_URLS)

        return [datasets.SplitGenerator(name=datasets.Split.TEST, gen_kwargs={'filepath': downloaded_files['test']})]

    def _generate_examples(self, filepath):
        '''This function returns the examples in the raw (text) form.'''
        logger.info("generating examples from = %s", filepath)
        key = 0
        with open(filepath, encoding="utf-8") as f:
            diabla = json.load(f)
            for dialogue_name in sorted(diabla['dialogues']):
                dialogue_history = [] # to store past utterances
                dialogue = diabla['dialogues'][dialogue_name]
                # Meta-information attached to the dialogue
                dialogue_info_keys = ['start_time', 'end_time', 'scenario',
                                      'user1', 'user2', 'translation_model',
                                      'final_evaluation_user1', 'final_evaluation_user2']
                 
                for user in 'user1', 'user2':
                    dialogue[user]['role_num'] = dialogue[user].get('role_num', dialogue[user].get('rolenum', ''))
                    for info_to_remove in ['eval-stage', 'useragent', 'rolenum']:
                        if info_to_remove in dialogue[user]:
                            del dialogue[user][info_to_remove]
                
                
                dialogue_info = {k: dialogue[k] for k in dialogue_info_keys}
                if dialogue_info['end_time'] is None:
                    dialogue_info['end_time'] = ''
                for final_eval in 'final_evaluation_user1', 'final_evaluation_user2':
                    # Initialise when empty
                    if dialogue_info[final_eval] == {}:
                        dialogue_info[final_eval] = {'grammaticality': '', 'meaning': '', 
                                                     'coherence': '', 'style': '', 'word_choice': ''}
                    # Remove some information                                 
                    for info_to_remove in ['interface','verbatim_quality', 
                                           'particular_problems', 'tech', 
                                           'would_use', 'timestamp', 'technical_issue']:
                        if info_to_remove in dialogue_info[final_eval]:
                            del dialogue_info[final_eval][info_to_remove]
                        
                # Main data: the utterances
                for utterance_id in dialogue['utterances']:
                    utterance = dialogue['utterances'][utterance_id]
                    # Meta-information attached to the utterance
                    utterance_info_keys = ['judgment', 'verbatim', 'problems']
                    utterance_info = {'eval_' + k: utterance['eval'][k] for k in utterance_info_keys}
                    if utterance_info['eval_judgment'] is None:
                        utterance_info['eval_judgment'] = ''
                    utterance_info['lang'] = utterance['language']
                    # Utterance text
                    original_text = utterance['original_text']
                    mt_text = utterance['postprocessed_text']
                    reference_text = utterance['reference_translation']
                    normalised_text = utterance['normalised_version']
                    id_ = dialogue_name + '_' + utterance_id
                    utterance_instance = {
                        'orig': original_text,
                        'norm': normalised_text,
                        'mt': mt_text,
                        'id': id_,
                        'ref': reference_text.replace('’', "'").replace('…', '...'), # normalise apostrophes to be the same as mt
                        'utterance_meta': utterance_info
                    }
                    
                    # add to history (without dialogue info and history)
                    minimal_utterance = utterance_instance.copy()
                    utterance_instance['dialogue_meta'] = dialogue_info
                    utterance_instance['dialogue_history'] = dialogue_history.copy()
                    dialogue_history.append(minimal_utterance) 
                    yield id_, utterance_instance