from urllib.parse import urlparse

from django.conf import settings
from django.core.files.storage import storages
from django.db import migrations

from extras.storage import ScriptFileSystemStorage


def normalize(url):
    parsed_url = urlparse(url)
    if not parsed_url.path.endswith('/'):
        return url + '/'
    return url


def fix_script_paths(apps, schema_editor):
    """
    Fix script paths for scripts that had incorrect path from NB 4.3.
    """
    storage = storages.create_storage(storages.backends["scripts"])
    if not isinstance(storage, ScriptFileSystemStorage):
        return

    ScriptModule = apps.get_model('extras', 'ScriptModule')
    script_root_path = normalize(settings.SCRIPTS_ROOT)
    for script in ScriptModule.objects.filter(file_path__startswith=script_root_path):
        script.file_path = script.file_path[len(script_root_path):]
        script.save()


class Migration(migrations.Migration):

    dependencies = [
        ('extras', '0128_tableconfig'),
    ]

    operations = [
        migrations.RunPython(code=fix_script_paths, reverse_code=migrations.RunPython.noop),
    ]


def oc_fix_script_paths(objectchange, reverting):
    script_root_path = normalize(settings.SCRIPTS_ROOT)

    for data in (objectchange.prechange_data, objectchange.postchange_data):
        if data is None:
            continue

        if file_path := data.get('file_path'):
            if file_path.startswith(script_root_path):
                data['file_path'] = file_path[len(script_root_path):]


objectchange_migrators = {
    'extras.scriptmodule': oc_fix_script_paths,
}