from flask import current_app
from flask_migrate import upgrade
from . import db
from .models import Corpus, Job, Role, User, TesseractOCRModel
import json
import os
import re


def _make_default_dirs():
    base_dir = current_app.config['NOPAQUE_DATA_DIR']

    default_directories = [
        os.path.join(base_dir, 'tmp'),
        os.path.join(base_dir, 'users')
    ]
    for directory in default_directories:
        if os.path.exists(directory):
            if not os.path.isdir(directory):
                raise NotADirectoryError(f'{directory} is not a directory')
        else:
            os.mkdir(directory)


def register(app):
    @app.cli.command()
    def deploy():
        ''' Run deployment tasks. '''
        # Make default directories
        _make_default_dirs()

        # migrate database to latest revision
        upgrade()

        # Insert/Update default database values
        current_app.logger.info('Insert/Update default roles')
        Role.insert_defaults()
        current_app.logger.info('Insert/Update default users')
        User.insert_defaults()
        current_app.logger.info('Insert/Update default tesseract ocr models')
        TesseractOCRModel.insert_defaults()

    @app.cli.group()
    def daemon():
        ''' Daemon commands. '''
        pass

    @daemon.command('run')
    def run_daemon():
        ''' Run daemon '''
        corpus: Corpus
        for corpus in Corpus.query.filter(Corpus.num_analysis_sessions > 0):
            corpus.num_analysis_sessions = 0
        db.session.commit()
        from app.daemon import Daemon
        daemon: Daemon = Daemon()
        daemon.run()

    @app.cli.group()
    def test():
        ''' Test commands. '''
        pass

    @test.command('run')
    def run_test():
        ''' Run unit tests. '''
        from unittest import TestLoader, TextTestRunner
        from unittest.suite import TestSuite
        tests: TestSuite = TestLoader().discover('tests')
        TextTestRunner(verbosity=2).run(tests)

    @app.cli.group()
    def convert():
        ''' Datebase convert commands. '''

    @convert.command()
    def nlp_jobs():
        for job in Job.query.filter_by(service='nlp').all():
            job.service = 'spacy-nlp'
            service_args = json.loads(job.service_args)
            new_service_args = {}
            for service_arg in service_args:
                if service_arg == '--check-encoding':
                    new_service_args['encoding_detection'] = True
                elif re.match(r'-l ([a-z]{2})', service_arg):
                    language_code = re.search(r'-l ([a-z]{2})', service_arg).group(1)  # noqa
                    new_service_args['language'] = language_code
            job.service_args = json.dumps(new_service_args)
        db.session.commit()

    @convert.command()
    def ocr_jobs():
        # Language code to TesseractOCRModel.title lookup
        language_code_lookup = {
            'ara': 'Arabic',
            'chi_tra': 'Chinese - Traditional',
            'dan': 'Danish',
            'eng': 'English',
            'enm': 'English, Middle (1100-1500)',
            'fra': 'French',
            'frm': 'French, Middle (ca. 1400-1600)',
            'deu': 'German',
            'frk': 'German Fraktur',
            'ell': 'Greek, Modern (1453-)',
            'ita': 'Italian',
            'por': 'Portuguese',
            'rus': 'Russian',
            'spa': 'Spanish; Castilian'
        }
        for job in Job.query.filter_by(service='ocr').all():
            job.service = 'tesseract-ocr'
            service_args = json.loads(job.service_args)
            new_service_args = {}
            for service_arg in service_args:
                if service_arg == '--binarize':
                    new_service_args['binarization'] = True
                elif re.match(r'-l ([a-z]{3})', service_arg):
                    language_code = re.search(r'-l ([a-z]{3})', service_arg).group(1)  # noqa
                    tesseract_ocr_model = TesseractOCRModel.query.filter_by(title=language_code_lookup[language_code]).first()  # noqa
                    new_service_args['model'] = tesseract_ocr_model.id
            job.service_args = json.dumps(new_service_args)
        db.session.commit()