from abc import ABC, abstractmethod
import re
import subprocess

from . import repository

class Target(ABC):
    name     = None
    dirs     = None
    excludes = None
    def __init__(self, name, dirs, excludes = None):
        if excludes is None:
            excludes = []

        self.name     = name
        self.dirs     = dirs
        self.excludes = excludes

    @abstractmethod
    def save(self, data_dir):
        pass

class TargetLocal(Target):
    def save(self, data_dir):
        cmd = ['bup', 'index', '--update', '--one-file-system']
        cmd.extend(['--exclude=%s' % e for e in self.excludes])
        cmd.extend(self.dirs)
        res_idx = subprocess.run(cmd, capture_output = True)

        cmd = ['bup', 'save', '-n', self.name] + self.dirs
        res_save = subprocess.run(cmd, capture_output = True)

        retcode = 0
        output  = b''
        if res_idx.returncode != 0:
            retcode = res_idx.returncode
            output += res_idx.stderr + res_idx.stdout
        if res_save.returncode != 0:
            retcode = res_save.returncode
            output += res_save.stderr + res_save.stdout

        result = repository.StepResult(retcode, output)

        return result