#!/usr/bin/python3
""""
Entrypoint of a Woodpecker CI docker image plugin that permit to publish Debian
packages on a Aptly repository using its API
"""

import datetime
import os
import re
import sys

from requests import Session
from requests.adapters import HTTPAdapter
from urllib3.util import Retry

from debian_parser import PackagesParser


# Handle parameters from environment
API_URL = os.environ.get('PLUGIN_API_URL', None)
if not API_URL:
    print('API URL not provided')
    sys.exit(1)

API_USERNAME = os.environ.get('PLUGIN_API_USERNAME', None)
if not API_USERNAME:
    print('API username not provided')
    sys.exit(1)

API_PASSWORD = os.environ.get('PLUGIN_API_PASSWORD', None)
if not API_PASSWORD:
    print('API password not provided')
    sys.exit(1)

MAX_RETRY = os.environ.get('PLUGIN_MAX_RETRIES', None)

REPO_NAME = os.environ.get('PLUGIN_REPO_NAME', 'stable')
REPO_COMPONENT = os.environ.get('PLUGIN_REPO_COMPONENT', 'main')
DIST = os.environ.get('PLUGIN_PATH', 'dist')
SOURCE_NAME = os.environ.get('PLUGIN_SOURCE_PACKAGE_NAME', None)

# List changes files
changes_files_regex = (
    # pylint: disable=consider-using-f-string
    re.compile(r'^%s_.*\.changes$' % SOURCE_NAME)
    if SOURCE_NAME else
    re.compile(r'^.*\.changes$')
)
changes_files = []
try:
    for filename in os.listdir(DIST):
        filepath = os.path.join(DIST, filename)
        if not os.path.isfile(filepath):
            continue
        if changes_files_regex.match(filename):
            changes_files.append(filepath)
except FileNotFoundError:
    print(f'Specified directory path "{DIST}" not found')
    sys.exit(1)
except NotADirectoryError:
    print(f'Specified path "{DIST}" is not a directory')
    sys.exit(1)

if not changes_files:
    print(f'No changes file found in {DIST}')
    sys.exit(1)


# Initialize Aptly API client
session = Session()
session.auth = (API_USERNAME, API_PASSWORD)
if MAX_RETRY:
    retries = Retry(
        total=int(MAX_RETRY),
        status_forcelist=list(range(500, 600))
    )
    session.mount(API_URL, HTTPAdapter(max_retries=retries))


# List and upload files from changes files
def list_files_in_changes_file(filepath):
    """ List files included by a changes file """
    dirpath = os.path.dirname(filepath)
    with open(filepath, "r", encoding="utf-8") as file_desc:
        changes_file = file_desc.read()

    parser = PackagesParser(changes_file)
    files = []
    for infos in parser.parse():
        for info in infos:
            if info['tag'].lower() != 'files':
                continue

            for line in info['value'].split('  '):
                if not line:
                    continue
                files.append(os.path.join(dirpath, line.split()[-1]))
    return files


def changes_file2package_name(changes_file):
    """ Retrieve package name from changes file name """
    return os.path.basename(changes_file).split('_')[0]


def upload_file(package_name, filepath):
    """ Upload a file using Aptly API """
    url = f'{API_URL}/files/{package_name}'
    with open(filepath, 'rb') as file_desc:
        result = session.post(url, files={'file': file_desc})
    return (
        result.status_code == 200 and
        f'{package_name}/{os.path.basename(filepath)}' in result.json()
    )


def include_file(package_name, changes_file):
    """ Include a changes file using Aptly API """
    url = (
        f'{API_URL}/repos/{REPO_NAME}/include/{package_name}/'
        f'{os.path.basename(changes_file)}'
    )
    result = session.post(url)
    data = result.json()
    if data.get('FailedFiles'):
        print()
        print(f'Some error occurred including {changes_file}:')
        print('Failed files:')
        for failed_file in data['FailedFiles']:
            print(f'  - {os.path.basename(failed_file)}')
        if data.get('Report', {}).get('Warnings'):
            print('Warnings:')
            print('  - %s' % '\n  - '.join(data['Report']['Warnings']))
        print()
        return False
    if not (
        result.status_code == 200 and
        data.get('Report', {}).get('Added')
    ):
        print(f'Unknown error occurred including {changes_file}')
        return False
    return True


for changes_file in changes_files:
    package_name = changes_file2package_name(changes_file)
    print(f'Handle changes file {changes_file}:')
    filepaths = [changes_file] + list_files_in_changes_file(changes_file)
    print(' - Upload files:')
    for filepath in filepaths:
        if not upload_file(package_name, filepath):
            print(
                f'    - {filepath}: fail to upload file, pass this changes '
                'file'
            )
            sys.exit(1)
        else:
            print(f'    - {filepath}')

    print(f' - Include changes file {changes_file}:')
    if include_file(package_name, changes_file):
        print('    - Changes file included')
    else:
        sys.exit(1)


# Create a snapshot of the repository
snap_name = datetime.datetime.now().strftime(f'%Y%m%d-%H%M%S_{REPO_NAME}')
print(f'Create new snapshot "{snap_name}" of repository "{REPO_NAME}"')

url = f'{API_URL}/repos/{REPO_NAME}/snapshots'
payload = {'Name': snap_name}
result = session.post(url, json=payload)
try:
    data = result.json()
except Exception:  # pylint: disable=broad-except
    data = {}
error = (
    result.status_code < 200 or
    result.status_code > 299 or
    data.get('Name') != snap_name or
    not data.get('CreatedAt')
)
if error:
    print(f'Fail to create snapshot "{snap_name}" of repository "{REPO_NAME}"')
    sys.exit(1)


# Update published snapshot of repository
print(
    f'Update published snapshot of repository "{REPO_NAME}" to "{snap_name}"')
url = f'{API_URL}/publish/:./{REPO_NAME}'
payload = {
    'Snapshots': [
        {
            'Component': REPO_COMPONENT,
            'Name': snap_name
        }
    ]
}
result = session.put(url, json=payload)
if (
    result.status_code < 200 or
    result.status_code > 299
):
    print(
        f'Fail to update published snapshot of repository "{REPO_NAME}" to '
        f'"{snap_name}"')
    sys.exit(1)

print("Done.")