#!/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 debian_parser import PackagesParser
from requests import Session
from requests.adapters import HTTPAdapter
from urllib3.util import Retry


def from_env(name, default=None):
    """Retrieve a parameter from environment"""
    for var in (f"PLUGIN_{name}", f"APTLY_{name}"):
        if var in os.environ:
            return os.environ[var]
    return default


# Handle parameters from environment
API_URL = from_env("API_URL", None)
if not API_URL:
    print("API URL not provided")
    sys.exit(1)

API_USERNAME = from_env("API_USERNAME", None)
if not API_USERNAME:
    print("API username not provided")
    sys.exit(1)

API_PASSWORD = from_env("API_PASSWORD", None)
if not API_PASSWORD:
    print("API password not provided")
    sys.exit(1)

MAX_RETRY = from_env("MAX_RETRIES", None)

REPO_NAME = from_env("REPO_NAME", None)
PREFIX = from_env("PREFIX", ".")
REPO_COMPONENT = from_env("REPO_COMPONENT", "main")
INPUT_PATH = from_env("PATH", "dist")
SOURCE_NAME = from_env("SOURCE_PACKAGE_NAME", None)
FORCE_OVERWRITE = from_env("FORCE_OVERWRITE", "false").lower() in ["1", "true", "yes"]

# 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(INPUT_PATH):
        filepath = os.path.join(INPUT_PATH, 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 "{INPUT_PATH}" not found')
    sys.exit(1)
except NotADirectoryError:
    print(f'Specified path "{INPUT_PATH}" is not a directory')
    sys.exit(1)

if not changes_files:
    print(f"No changes file found in {INPUT_PATH}")
    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))


def get_repo_name(dist):
    """Compute and retrieve repository name"""
    if REPO_NAME:
        return REPO_NAME
    value = f"{dist}_{REPO_COMPONENT}"
    if PREFIX != ".":
        value = f"{PREFIX}_{value}"
    return value


def parse_changes_file(filepath):
    """Parse changes file to detect distribution and included files"""
    dirpath = os.path.dirname(filepath)
    with open(filepath, encoding="utf-8") as file_desc:
        changes_file = file_desc.read()

    parser = PackagesParser(changes_file)
    package_name = None
    distribution = None
    files = []
    for infos in parser.parse():
        for info in infos:
            if info["tag"].lower() == "files":
                for line in info["value"].split("  "):
                    if not line:
                        continue
                    files.append(os.path.join(dirpath, line.split()[-1]))
            if info["tag"].lower() == "distribution":
                if distribution:
                    print(
                        "More than one distribution found in changes file"
                        f"{os.path.basename(filepath)}."
                    )
                    sys.exit(1)
                distribution = info["value"]
            if info["tag"].lower() == "source":
                if package_name:
                    print(
                        "More than one source package name found in changes "
                        f"file {os.path.basename(filepath)}."
                    )
                    sys.exit(1)
                package_name = info["value"]

    if not package_name:
        print(
            "Fail to detect source package name from changes file " f"{os.path.basename(filepath)}."
        )
        sys.exit(1)

    if not distribution:
        print("Fail to detect distribution from changes file " f"{os.path.basename(filepath)}.")
        sys.exit(1)

    if not files:
        print("No included file found in changes file" f"{os.path.basename(filepath)}.")
        sys.exit(1)

    return (package_name, distribution, files)


def get_published_distribution_other_components_sources(distribution):
    """Retrieve current published distribution using Aptly API"""
    url = f"{API_URL}/publish"
    result = session.get(url)
    if result.status_code != 200:
        print(
            "Fail to retrieve current published distribution "
            f"{distribution} using Aptly API (HTTP code: {result.status_code})"
        )
        sys.exit(1)
    for data in result.json():
        if data["Prefix"] != PREFIX:
            continue
        if data["Distribution"] != distribution:
            continue
        if data["SourceKind"] != "snapshot":
            print(
                f"The distribution {distribution} currently published on "
                f'prefix "{PREFIX}" do not sourcing packages from snapshot(s) '
                f'but from {data["SourceKind"]}.'
            )
            sys.exit(1)
        return [source for source in data["Sources"] if source["Component"] != REPO_COMPONENT]
    print(
        f"Distribution {distribution} seem not currently published on prefix "
        f'"{PREFIX}". Please manually publish it a first time before using '
        f"{os.path.basename(sys.argv[0])}."
    )
    sys.exit(1)


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(repo_name, 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}" "See APTLY API logs for details.")
        return False
    return True


for changes_file in changes_files:
    print(f"Handle changes file {changes_file}:")
    package_name, distribution, filepaths = parse_changes_file(changes_file)
    filepaths += [changes_file]
    repo_name = get_repo_name(distribution)

    other_components_sources = get_published_distribution_other_components_sources(distribution)

    print(" - Upload files:")
    for filepath in filepaths:
        if not upload_file(package_name, filepath):
            print(f"    - {filepath}: fail to upload file. See APTLY API logs " "for details.")
            sys.exit(1)
        else:
            print(f"    - {filepath}")

    print(f" - Include changes file {changes_file}:")
    if include_file(repo_name, 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 '
            f'"{repo_name}". See APTLY API logs for details.'
        )
        sys.exit(1)

    # Update published snapshot of the distribution
    print(
        f'Update published snapshot of distribution "{distribution}" to '
        f'"{snap_name}" (prefix: {PREFIX}, component: {REPO_COMPONENT})'
    )
    if other_components_sources:
        print("Note: keep other currently published components:")
        for source in other_components_sources:
            print(f'- {source["Component"]}: {source["Name"]}')
    url = f"{API_URL}/publish/:{PREFIX}/{distribution}"
    payload = {
        "Snapshots": other_components_sources + [{"Component": REPO_COMPONENT, "Name": snap_name}],
        "ForceOverwrite": FORCE_OVERWRITE,
    }
    result = session.put(url, json=payload)
    if result.status_code < 200 or result.status_code > 299:
        print(
            "Fail to update published snapshot of distribution "
            f'"{distribution}" to "{snap_name}" (prefix: {PREFIX}, '
            f"component: {REPO_COMPONENT}). See APTLY API logs for details."
        )
        sys.exit(1)

print("Done.")