#!/usr/bin/env python3
import json
import os
import sys
import subprocess
import errno

from typing import List, Dict, Any

ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
sys.path.append(ZULIP_PATH)

log_dir = "var/log/python_dependency_upgrade"
try:
    os.makedirs(log_dir)
except OSError as e:
    if e.errno != errno.EEXIST:
        raise

outdated_packages = []  # type: List[Dict[str, str]]
packages_json = subprocess.check_output(["pip", "list", "--outdated", "--format=json"])
outdated_packages = json.loads(packages_json.decode("utf-8"))

unupgradable_packages = {}  # type: Dict[str, Any]
with open("requirements/unupgradable.json") as f:
    unupgradable_packages = json.load(f)

def delete_locked_requirements(locked_requirement_files: List[str]) -> None:
    for lock_file in locked_requirement_files:
        try:
            os.remove("requirements/{}".format(lock_file))
        except OSError:
            pass

def prepare_for_commit() -> None:
    subprocess.check_output(["./tools/update-locked-requirements"], stderr=subprocess.STDOUT)
    subprocess.check_output(["./tools/provision"], stderr=subprocess.STDOUT)
    subprocess.check_output(["./tools/test-backend"], stderr=subprocess.STDOUT)
    subprocess.check_call(["git", "add", "requirements"])

def commit_and_push(commit_msg: str) -> None:
    subprocess.check_call(["git", "commit", "-m", commit_msg])
    subprocess.check_call(["git", "push", "origin", "HEAD", "--force"])

def do_upgrade(requirement_file: str, locked_requirement_files: List[str]) -> None:
    if len(locked_requirement_files) != 0:
        delete_locked_requirements(locked_requirement_files)
        try:
            prepare_for_commit()
            diff = subprocess.check_output(["git", "diff", "requirements/"])
            if diff:
                locked_files_str = ", ".join(locked_requirement_files)
                commit_msg = "requirements: Upgrade indirect dependencies in {}.".format(locked_files_str)
                commit_and_push(commit_msg)
        except subprocess.CalledProcessError as e:
            print("Upgrading indirect dependencies in {} failed".format(requirement_file))
            log_file = "{}/{}".format(log_dir, requirement_file)
            with open(log_file, "w") as f:
                f.write(e.output.decode("utf-8"))

    for package in outdated_packages:
        pkg_name = package["name"]
        version = package["version"]
        latest_version = package["latest_version"]
        log_file = "{}/{}".format(log_dir, pkg_name)

        if pkg_name in unupgradable_packages:
            continue

        sed_string_template = "s/{name}=={version}/{name}=={latest_version}/g"
        sed_string = sed_string_template.format(name=pkg_name, version=version,
                                                latest_version=latest_version)

        files_updated = False
        subprocess.check_call(["git", "stash"])

        file_path = "requirements/{}".format(requirement_file)
        subprocess.check_call(["sed", "-i", sed_string, file_path])

        files_updated = subprocess.check_output(["git", "diff", file_path])

        if not files_updated:
            continue

        if pkg_name == "stripe":
            with open(log_file, "w") as f:
                url = ("https://zulip.readthedocs.io/en/stable/subsystems/billing.html"
                       "#upgrading-stripe-api-versions")
                f.write("Stripe upgrade available. Upgrade manually. Make sure to update fixtures as well.")
                f.write(url)
            continue

        try:
            print("Trying to upgrade {}".format(pkg_name))
            prepare_for_commit()
            commit_msg = "requirements: Upgrade {} from {} to {}.".format(pkg_name, version, latest_version)
            commit_and_push(commit_msg)
        except subprocess.CalledProcessError as e:
            print("{} upgrade failed".format(pkg_name))
            with open(log_file, "w") as f:
                f.write(e.output.decode("utf-8"))

do_upgrade("common.in", ["dev.txt", "prod.txt"])
do_upgrade("dev.in", [])
do_upgrade("prod.in", [])
do_upgrade("docs.in", ["docs.txt"])
do_upgrade("thumbor.in", ["thumbor.txt"])
do_upgrade("pip.txt", [])