# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, # You can obtain one at http://mozilla.org/MPL/2.0/.

import os
import subprocess
import tempfile
import urllib


class BaseHost:
    def __init__(self, manifest):
        self.manifest = manifest
        self.repo_url = urllib.parse.urlparse(self.manifest["vendoring"]["url"])

    def upstream_tag(self, revision):
        """Temporarily clone the repo to get the latest tag and timestamp"""
        with tempfile.TemporaryDirectory() as temp_repo_clone:
            starting_directory = os.getcwd()
            os.chdir(temp_repo_clone)
            subprocess.run(
                [
                    "git",
                    "clone",
                    "-c",
                    "core.autocrlf=input",
                    self.manifest["vendoring"]["url"],
                    self.manifest["origin"]["name"],
                ],
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                universal_newlines=True,
                check=True,
            )
            os.chdir("/".join([temp_repo_clone, self.manifest["origin"]["name"]]))
            if revision == "HEAD":
                tag = subprocess.run(
                    ["git", "--no-pager", "tag", "--sort=creatordate"],
                    stdout=subprocess.PIPE,
                    stderr=subprocess.PIPE,
                    universal_newlines=True,
                    check=True,
                ).stdout.splitlines()[-1]
            else:
                try:
                    tag = subprocess.run(
                        ["git", "--no-pager", "tag", "-l", revision],
                        stdout=subprocess.PIPE,
                        stderr=subprocess.PIPE,
                        universal_newlines=True,
                        check=True,
                    ).stdout.splitlines()[-1]
                except IndexError:  # 0 lines of output, the tag does not exist
                    raise Exception(f"Requested tag {revision} not found in source.")

            tag_timestamp = subprocess.run(
                [
                    "git",
                    "log",
                    "-1",
                    "--date=iso8601-strict",
                    "--format=%ad",
                    tag,
                ],
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                universal_newlines=True,
                check=True,
            ).stdout.splitlines()[-1]
            os.chdir(starting_directory)
            return tag, tag_timestamp

    def upstream_snapshot(self, revision):
        raise Exception("Unimplemented for this subclass...")

    def upstream_path_to_file(self, revision, filepath):
        raise Exception("Unimplemented for this subclass...")
