from django.core.management.base import BaseCommand, CommandError
from orm.models import LayerSource, ToasterSetting, Layer, Layer_Version
from orm.models import BitbakeVersion, Release, ReleaseDefaultLayer
from django.db import IntegrityError
import os

from .checksettings import DN

import logging
logger = logging.getLogger("toaster")


class Command(BaseCommand):
    help = "Loads a toasterconf.json file in the database"
    args = "filepath"



    def _import_layer_config(self, filepath):
        if not os.path.exists(filepath) or not os.path.isfile(filepath):
            raise Exception("Failed to find toaster config file %s ." % filepath)

        import json
        data = json.loads(open(filepath, "r").read())

        # verify config file validity before updating settings
        for i in ['bitbake', 'releases', 'defaultrelease', 'config']:
            assert i in data

        def _read_git_url_from_local_repository(address):
            url = None
            # we detect the remote name at runtime
            import subprocess
            (remote, remote_name) = address.split(":", 1)
            cmd = subprocess.Popen("git remote -v", shell=True, cwd = os.path.dirname(filepath), stdout=subprocess.PIPE, stderr = subprocess.PIPE)
            (out,err) = cmd.communicate()
            if cmd.returncode != 0:
                logging.warning("Error while importing layer vcs_url: git error: %s" % err)
            for line in out.decode('utf-8').split("\n"):
                try:
                    (name, path) = line.split("\t", 1)
                    if name == remote_name:
                        url = path.split(" ")[0]
                        break
                except ValueError:
                    pass
            if url == None:
                logging.warning("Error while looking for remote \"%s\" in \"%s\"" % (remote_name, out))
            return url


        # import bitbake data
        for bvi in data['bitbake']:
            bvo, created = BitbakeVersion.objects.get_or_create(name=bvi['name'])
            if bvi['giturl'].startswith("remote:"):
                bvo.giturl = _read_git_url_from_local_repository(bvi['giturl'])
                if bvo.giturl is None:
                    logger.error("The toaster config file references the local git repo, but Toaster cannot detect it.\nYour local configuration for bitbake version %s is invalid. Make sure that the toasterconf.json file is correct." % bvi['name'])

            if bvo.giturl is None:
                bvo.giturl = bvi['giturl']
            bvo.branch = bvi['branch']
            bvo.dirpath = bvi['dirpath']
            bvo.save()

        for ri in data['releases']:
            bvo = BitbakeVersion.objects.get(name = ri['bitbake'])
            assert bvo is not None

            ro, created = Release.objects.get_or_create(name = ri['name'], bitbake_version = bvo, branch_name = ri['branch'])
            ro.description = ri['description']
            ro.helptext = ri['helptext']
            ro.save()

            for dli in ri['defaultlayers']:
                # find layers with the same name
                ReleaseDefaultLayer.objects.get_or_create( release = ro, layer_name = dli)

        # set default release
        if ToasterSetting.objects.filter(name = "DEFAULT_RELEASE").count() > 0:
            ToasterSetting.objects.filter(name = "DEFAULT_RELEASE").update(value = data['defaultrelease'])
        else:
            ToasterSetting.objects.create(name = "DEFAULT_RELEASE", value = data['defaultrelease'])

        # set default config variables
        for configname in data['config']:
            if ToasterSetting.objects.filter(name = "DEFCONF_" + configname).count() > 0:
                ToasterSetting.objects.filter(name = "DEFCONF_" + configname).update(value = data['config'][configname])
            else:
                ToasterSetting.objects.create(name = "DEFCONF_" + configname, value = data['config'][configname])


    def handle(self, *args, **options):
        if len(args) == 0:
            raise CommandError("Need a path to the toasterconf.json file")
        filepath = args[0]
        self._import_layer_config(filepath)