import hashlib

from django_migration_linter.utils import split_migration_path


class Migration(object):
    def __init__(self, abs_path):
        self.abs_path = abs_path
        self.app_name, self.name = split_migration_path(self.abs_path)

    def __lt__(self, other):
        if not isinstance(other, Migration):
            return NotImplemented
        return self.abs_path < other.abs_path

    def get_md5hash(self):
        hash_md5 = hashlib.md5()
        with open(self.abs_path, "rb") as f:
            for chunk in iter(lambda: f.read(4096), b""):
                hash_md5.update(chunk)
        return hash_md5.hexdigest()