import json
from pathlib import Path
from zipfile import ZipFile
from typing import List, Dict, Any
from tempfile import TemporaryDirectory


def validate_zip(submission_track: str, submission_zip: str):
    """
    Validates the submission format and contents
    Args:
        submission_track: the track of the submission
        submission_zip: path to the submission zip file
    Raises:
        ValueError: if the submission zip is invalid

    """
    with TemporaryDirectory() as temp_dir:
        with ZipFile(submission_zip, 'r') as submission_zip_file:
            submission_zip_file.extractall(temp_dir)
        submission_dir = Path(temp_dir)
        if submission_track in ['NOTSOFAR-SC', 'NOTSOFAR-MC']:
            validate_notsofar_submission(submission_dir=submission_dir)
        elif submission_track in ['DASR-Constrained-LM', 'DASR-Unconstrained-LM']:
            validate_dasr_submission(submission_dir=submission_dir)
        else:
            raise ValueError(f'Invalid submission track: {submission_track}')


def validate_notsofar_submission(submission_dir: Path):
    """
    Validates NOTSOFAR submission format and contents
    Args:
        submission_dir: path to the submission directory
    Raises:
        ValueError: if the submission zip is invalid
    """
    submission_file_names = ['tc_orc_wer_hyp.json', 'tcp_wer_hyp.json']
    fields = ['session_id', 'words', 'speaker', 'start_time', 'end_time']

    for file_name in submission_file_names:
        file_path = submission_dir / file_name
        if not file_path.exists():
            raise ValueError(f'Missing {file_name}')
        with open(file_path, 'r') as json_file:
            json_data: List[Dict[str, Any]] = json.load(json_file)
            if not isinstance(json_data, list):
                raise ValueError(f'Invalid `{file_name}` format, expecting a list of entries')
            for data in json_data:
                if not all(field in data for field in fields):
                    raise ValueError(f'Invalid `{file_name}` format, fields: {fields} are required in each entry')


def validate_dasr_submission(submission_dir: Path):
    """
    Validates DASR submission format and contents
    Args:
        submission_dir: path to the submission directory
    Raises:
        ValueError: if the submission zip is invalid

    """
    submission_file_names = ['chime6.json', 'dipco.json', 'mixer6.json', 'notsofar1.json']
    fields = ['session_id', 'words', 'speaker', 'start_time', 'end_time']

    if not (submission_dir / 'dev').exists():
        raise ValueError('Missing dev directory, expecting a directory named `dev` with the submission files in it.')

    for file_name in submission_file_names:
        file_path = submission_dir / 'dev' / file_name
        if not file_path.exists():
            raise ValueError(f'Missing {file_name}')
        with open(file_path, 'r') as json_file:
            json_data: List[Dict[str, Any]] = json.load(json_file)
            if not isinstance(json_data, list):
                raise ValueError(f'Invalid `{file_name}` format, expecting a list of entries')
            for data in json_data:
                if not all(field in data for field in fields):
                    raise ValueError(f'Invalid `{file_name}` format, fields: {fields} are required in each entry')