import os
from glob import glob
from re import sub as re_sub
from git import Repo, exc
import yaml


class DTLRepo:
    def __new__(cls, *args, **kwargs):
        return super().__new__(cls)

    def __init__(self, args, repo_path, exception_handler):
        self.handle = exception_handler
        self.yaml_extensions = ['yaml', 'yml']
        self.url = args.url
        self.repo_path = repo_path
        self.branch = args.branch
        self.repo = None
        self.cwd = os.getcwd()

        if os.path.isdir(self.repo_path):
            self.pull_repo()
        else:
            self.clone_repo()

    def get_relative_path(self):
        return self.repo_path

    def get_absolute_path(self):
        return os.path.join(self.cwd, self.repo_path)

    def get_devices_path(self):
        return os.path.join(self.get_absolute_path(), 'device-types')

    def get_modules_path(self):
        return os.path.join(self.get_absolute_path(), 'module-types')

    def slug_format(self, name):
        return re_sub('\W+', '-', name.lower())

    def pull_repo(self):
        try:
            self.handle.log("Package devicetype-library is already installed, "
                            + f"updating {self.get_absolute_path()}")
            self.repo = Repo(self.repo_path)
            if not self.repo.remotes.origin.url.endswith('.git'):
                self.handle.exception("GitInvalidRepositoryError", self.repo.remotes.origin.url,
                                      f"Origin URL {self.repo.remotes.origin.url} does not end with .git")
            self.repo.remotes.origin.pull()
            self.repo.git.checkout(self.branch)
            self.handle.verbose_log(
                f"Pulled Repo {self.repo.remotes.origin.url}")
        except exc.GitCommandError as git_error:
            self.handle.exception(
                "GitCommandError", self.repo.remotes.origin.url, git_error)
        except Exception as git_error:
            self.handle.exception(
                "Exception", 'Git Repository Error', git_error)

    def clone_repo(self):
        try:
            self.repo = Repo.clone_from(
                self.url, self.get_absolute_path(), branch=self.branch)
            self.handle.log(
                f"Package Installed {self.repo.remotes.origin.url}")
        except exc.GitCommandError as git_error:
            self.handle.exception("GitCommandError", self.url, git_error)
        except Exception as git_error:
            self.handle.exception(
                "Exception", 'Git Repository Error', git_error)

    def get_devices(self, base_path, vendors: list = None):
        files = []
        discovered_vendors = []
        vendor_dirs = os.listdir(base_path)

        for folder in [vendor for vendor in vendor_dirs if not vendors or vendor.casefold() in vendors]:
            if folder.casefold() != "testing":
                discovered_vendors.append({'name': folder,
                                           'slug': self.slug_format(folder)})
                for extension in self.yaml_extensions:
                    files.extend(glob(base_path + folder + f'/*.{extension}'))
        return files, discovered_vendors

    def parse_files(self, files: list, slugs: list = None):
        deviceTypes = []
        for file in files:
            with open(file, 'r') as stream:
                try:
                    data = yaml.safe_load(stream)
                except yaml.YAMLError as excep:
                    self.handle.verbose_log(excep)
                    continue
                manufacturer = data['manufacturer']
                data['manufacturer'] = {
                    'name': manufacturer, 'slug': self.slug_format(manufacturer)}

                # Save file location to resolve any relative paths for images
                data['src'] = file

            match_any_given_slug_wildcard = any(
                [s.lower() in data["slug"].lower() for s in slugs if "slug" in data]
            )
            if not match_any_given_slug_wildcard:
                self.handle.verbose_log(f"Skipping {data['model']}")
                continue

            deviceTypes.append(data)
        return deviceTypes