#!/usr/bin/env python3

import subprocess
import io
import os
import sys
import yaml
import argparse
import logging
from datetime import datetime
import tarfile
import shutil
from git import Repo, GitCommandError
import tempfile
from concurrent.futures import ThreadPoolExecutor, wait, FIRST_COMPLETED
import fnmatch
import re
from debian.copyright import Header, Copyright
import uuid
from common import clean_old_logs

BASE_DIR = "/srv/lubuntu-ci/repos"
DEBFULLNAME = "Lugito"
DEBEMAIL = "info@lubuntu.me"
OUTPUT_DIR = os.path.join(BASE_DIR, "build_output")
SUPPRESSED_LINTIAN_TAGS = [
    "orig-tarball-missing-upstream-signature",
    "package-has-long-file-name",
    "adopted-extended-field"
]
BASE_OUTPUT_DIR = "/srv/lubuntu-ci/output"
LOG_DIR = os.path.join(BASE_OUTPUT_DIR, "logs", "source_builds")
BASE_LINTIAN_DIR = os.path.join(BASE_OUTPUT_DIR, f"lintian.tmp.{str(uuid.uuid4())[:8]}")
REAL_LINTIAN_DIR = os.path.join(BASE_OUTPUT_DIR, "lintian")

os.makedirs(LOG_DIR, exist_ok=True)
os.makedirs(OUTPUT_DIR, exist_ok=True)
os.makedirs(BASE_LINTIAN_DIR, exist_ok=True)

current_time = datetime.utcnow().strftime("%H-%M-%S")
log_file = os.path.join(LOG_DIR, f"{current_time}.log")
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(levelname)s - %(message)s",
    handlers=[
        logging.FileHandler(log_file),
        logging.StreamHandler()
    ]
)
logger = logging.getLogger("TimeBasedLogger")

def run_command(cmd, cwd=None, env=None, show_output=False):
    logging.info(f"Executing: {' '.join(cmd)} in {cwd or 'current directory'}")
    try:
        result = subprocess.run(
            cmd,
            cwd=cwd,
            env=env,
            check=True,
            capture_output=True,
            text=True
        )
        if show_output:
            if result.stdout:
                logging.info(f"Output: {result.stdout.strip()}")
            if result.stderr:
                logging.warning(f"Output: {result.stderr.strip()}")
        logging.info(f"Command succeeded: {' '.join(cmd)}")
    except subprocess.CalledProcessError as e:
        logging.error(f"Command failed: {' '.join(cmd)}")
        logging.error(e.stderr)
        raise

def parse_version(changelog_path):
    try:
        with open(changelog_path, "r") as f:
            first_line = f.readline().strip()
        version_match = first_line.split("(")[1].split(")")[0]
        # Remove Debian revision
        upstream_version = version_match.split("-")[0]
        # Remove '+git...' and '~release' if present
        upstream_version = re.sub(r'(\+git[0-9]+)?(~[a-z]+)?$', '', upstream_version)
        logging.info(f"Upstream version extracted: {upstream_version}")
        current_date = datetime.now().strftime("%Y%m%d%H%M")
        version = f"{upstream_version}+git{current_date}"
        logging.info(f"Parsed VERSION: {version}")
        return version
    except (IndexError, FileNotFoundError) as e:
        logging.error(f"Error parsing version from {changelog_path}: {e}")
        raise

def get_exclusions(packaging):
    exclusions = []
    with io.open(os.path.join(packaging, "debian/copyright"), "rt", encoding="utf-8") as f:
        copyright_obj = Copyright(f)
        for paragraph in copyright_obj.all_paragraphs():
            if isinstance(paragraph, Header):
                if paragraph.files_excluded:
                    for file_name in paragraph.files_excluded:
                        exclusions.append(file_name)
                break
    return exclusions

def create_tarball(name, source_dir, exclusions=[]):
    tar_filename = f"{name}_MAIN.orig.tar.gz"
    logging.info(f"Creating tarball: {tar_filename}")
    exclusions.append(".git/")

    def exclusion_func(tarinfo):
        for exclusion in exclusions:
            if exclusion in tarinfo.name:
                return None

        return tarinfo

    with tarfile.open(tar_filename, "w:gz") as tar:
        tar.add(source_dir, arcname=os.path.basename(source_dir), filter=exclusion_func)
    logging.info(f"Tarball created and compressed: {tar_filename}")

def update_changelog(packaging_dir, release, version, env):
    name = os.path.basename(packaging_dir)
    logging.info(f"Updating changelog for {name} to version {version}-0ubuntu1~ppa1")
    run_command(["git", "checkout", "debian/changelog"], cwd=packaging_dir)
    cmd = [
        "dch",
        "--distribution", release,
        "--package", name,
        "--newversion", f"{version}-0ubuntu1~ppa1",
        "--urgency", "low",
        "CI upload."
    ]
    run_command(cmd, cwd=packaging_dir, env=env)

def build_package(packaging_dir, env):
    name = os.path.basename(packaging_dir)
    logging.info(f"Building source package for {name}")

    temp_dir = tempfile.mkdtemp()
    try:
        temp_packaging_dir = os.path.join(temp_dir, name)
        os.makedirs(temp_packaging_dir, exist_ok=True)
        shutil.copytree(packaging_dir + "/debian", temp_packaging_dir + "/debian")

        tarball_name = f"{name}_{env['VERSION']}.orig.tar.gz"
        tarball_source = os.path.join(BASE_DIR, tarball_name)
        tarball_dest = os.path.join(temp_dir, tarball_name)
        shutil.copyfile(tarball_source, tarball_dest)

        cmd_build = ["debuild", "--no-lintian", "-S", "-d", "-sa"]
        run_command(cmd_build, cwd=temp_packaging_dir, env=env)
        run_command(["git", "checkout", "debian/changelog"], cwd=packaging_dir)

        pattern = f"{name}_{env['VERSION']}*"
        for filename in os.listdir(temp_dir):
            if fnmatch.fnmatch(filename, pattern):
                source_file = os.path.join(temp_dir, filename)
                dest_file = os.path.join(OUTPUT_DIR, filename)
                shutil.copyfile(source_file, dest_file)
                logging.info(f"Copied {filename} to {OUTPUT_DIR}")

        changes_files = [f for f in os.listdir(OUTPUT_DIR) if f.startswith(f"{name}_{env['VERSION']}") and f.endswith("_source.changes")]
        if changes_files:
            changes_file = os.path.join(OUTPUT_DIR, changes_files[-1])
            logging.info(f"Built package, changes file: {changes_file}")
            return changes_file
        else:
            logging.error("No changes file found after build.")
            raise FileNotFoundError("Changes file not found.")
    finally:
        shutil.rmtree(temp_dir)

def load_config(config_path):
    try:
        with open(config_path, "r") as f:
            config = yaml.safe_load(f)
        if "packages" not in config or "releases" not in config:
            raise ValueError("Config file must contain 'packages' and 'releases' sections.")
        return config
    except Exception as e:
        logging.error(f"Error loading config file: {e}")
        sys.exit(1)

def clone_or_update_repo(destination, repo_url, repo_branch=None):
    if os.path.exists(destination):
        logging.info(f"Repository already exists at {destination}, checking branch and remote URL.")
        try:
            repo = Repo(destination)

            current_remote_url = repo.remotes.origin.url
            if current_remote_url != repo_url:
                logging.info(f"Remote URL differs for {destination}. Removing and recloning.")
                shutil.rmtree(destination)
            else:
                repo.git.reset("--hard", "HEAD")
                current_branch = repo.active_branch.name
                if repo_branch and current_branch != repo_branch:
                    logging.info(f"Branch differs for {destination}. Removing and recloning.")
                    shutil.rmtree(destination)
                else:
                    logging.info(f"Repository matches desired remote and branch, pulling updates.")
                    repo.git.checkout(repo_branch or current_branch)
                    try:
                        repo.remotes.origin.pull()
                        repo.submodule_update(recursive=True)
                        logging.info(f"Pulled latest changes for {destination}")
                    except GitCommandError as e:
                        if 'non-fast-forward' in str(e):
                            logging.error(f"Pull failed due to non-fast-forward update: {e}")
                            logging.info(f"Removing repository {destination} and cloning again.")
                            shutil.rmtree(destination)
                        else:
                            logging.error(f"Pull failed for {destination}: {e}")
                            raise
                    else:
                        return
        except Exception as e:
            logging.error(f"Error updating repository {destination}: {e}")
            logging.info(f"Removing repository {destination} and cloning again.")
            shutil.rmtree(destination)
    try:
        logging.info(f"Cloning repository {repo_url} into {destination}")
        repo = Repo.clone_from(repo_url, destination, recurse_submodules=True)
        if repo_branch:
            repo.git.checkout(repo_branch)
            logging.info(f"Checked out {repo_branch} in {destination}")
    except GitCommandError as e:
        logging.error(f"Git clone failed for {repo_url}: {e}")
        raise

def publish_lintian():
    if os.path.exists(BASE_LINTIAN_DIR):
        for root, dirs, files in os.walk(BASE_LINTIAN_DIR):
            for file in files:
                # Determine the source and destination paths
                src_path = os.path.join(root, file)
                rel_path = os.path.relpath(src_path, BASE_LINTIAN_DIR)
                dest_path = os.path.join(REAL_LINTIAN_DIR, rel_path)

                # Ensure the destination directory exists
                os.makedirs(os.path.dirname(dest_path), exist_ok=True)

                # Copy the file
                shutil.copy2(src_path, dest_path)

        # Remove the temporary directory
        shutil.rmtree(BASE_LINTIAN_DIR)

def run_source_lintian(name, sources_path):
    logging.info(f"Running Lintian for {name}")
    with tempfile.NamedTemporaryFile(mode='w+', suffix='.txt') as temp_file:
        temp_file.write("\n".join(SUPPRESSED_LINTIAN_TAGS))
        temp_file.flush()
        temp_file_path = temp_file.name

        cmd = [
            "lintian",
            "-EvIL",
            "+pedantic",
            "--suppress-tags-from-file",
            f"{temp_file_path}",
            sources_path
        ]

        result = subprocess.run(
            cmd,
            capture_output=True,
            text=True
        )

    stderr, stdout = None, None
    if result.stderr:
        stderr = result.stderr.strip()
    if result.stdout:
        stdout = result.stdout.strip()

    lintian_output = None
    if stderr == stdout:
        lintian_output = stderr
    else:
        lintian_output = f"{stderr}\n{stdout}".strip()

    if lintian_output:
        pkgdir = os.path.join(BASE_LINTIAN_DIR, name)
        if not os.path.exists(pkgdir):
            os.mkdir(pkgdir)
        output_file = os.path.join(pkgdir, "source.txt")
        with open(output_file, "a") as f:
            f.write(lintian_output)

    logging.info(f"Lintian run for {name} is complete")

def main():
    parser = argparse.ArgumentParser(description="Automate Lubuntu package builds.")
    parser.add_argument("config", help="Path to the YAML configuration file.")
    parser.add_argument("--skip-dput", action="store_true", help="Skip the dput upload step.")
    parser.add_argument("--skip-cleanup", action="store_true", help="Skip removal of build_output.")
    args = parser.parse_args()

    config = load_config(args.config)
    packages = config["packages"]
    releases = config["releases"]

    os.makedirs(BASE_DIR, exist_ok=True)
    logging.info(f"Using base directory: {BASE_DIR}")
    os.chdir(BASE_DIR)

    with ThreadPoolExecutor(max_workers=5) as executor:
        def dput_source(name, upload_target, changes_files, devel_changes_files):
            if changes_files:
                hr_changes = ", ".join(changes_files)
                logging.info(f"Uploading {hr_changes} to {upload_target} using dput")
                cmd_upload = ["dput", upload_target] + changes_files
                run_command(cmd_upload, cwd=OUTPUT_DIR)
                logging.info(f"Completed upload of {hr_changes} to {upload_target}")

                for file in devel_changes_files:
                    if file:
                        futures.add(executor.submit(run_source_lintian, name, file))

        def prepare_package(pkg):
            name = pkg.get("name")
            if not name:
                logging.warning(f"Skipping package due to missing name: {pkg}")
                return
            upstream_url = pkg.get("upstream_url") or f"https://github.com/lxqt/{name}.git"
            upstream_destination = os.path.join(BASE_DIR, f"upstream-{name}")
            clone_or_update_repo(upstream_destination, upstream_url)
            packaging_url = pkg.get("packaging_url") or f"https://git.lubuntu.me/Lubuntu/{name}-packaging.git"
            packaging_branch = pkg.get("packaging_branch") or f"ubuntu/{releases[0]}" if releases else None
            packaging_destination = os.path.join(BASE_DIR, name)
            clone_or_update_repo(packaging_destination, packaging_url, packaging_branch)
            exclusions = get_exclusions(packaging_destination)
            create_tarball(name, upstream_destination, exclusions)
            run_command(["update-maintainer"], cwd=packaging_destination)
            futures.add(executor.submit(process_package, pkg))

        def process_package(pkg):
            name = pkg.get("name")
            upload_target = pkg.get("upload_target", "ppa:lubuntu-ci/unstable-ci-proposed")

            if not name:
                logging.warning(f"Skipping package due to missing name: {pkg}")
                return []

            package_changes = []

            packaging_destination = os.path.join(BASE_DIR, name)
            changelog_path = os.path.join(packaging_destination, "debian", "changelog")
            version = parse_version(changelog_path)

            for release in releases:
                logging.info(f"Building {name} for {release}")
                try:
                    release_version = f"{version}~{release}"
                    tarball_name = f"{name}_{release_version}.orig.tar.gz"
                    tarball_source = os.path.join(BASE_DIR, f"{name}_MAIN.orig.tar.gz")
                    tarball_dest = os.path.join(BASE_DIR, tarball_name)
                    shutil.copyfile(tarball_source, tarball_dest)

                    env = os.environ.copy()
                    env["DEBFULLNAME"] = DEBFULLNAME
                    env["DEBEMAIL"] = DEBEMAIL
                    env["VERSION"] = release_version
                    env["UPLOAD_TARGET"] = upload_target

                    # Update changelog and build package
                    update_changelog(packaging_destination, release, release_version, env)
                    changes_file = build_package(packaging_destination, env)
                    if changes_file:
                        package_changes.append((changes_file, env))
                    os.remove(os.path.join(BASE_DIR, tarball_name))

                except Exception as e:
                    logging.error(f"Error processing package '{name}' for release '{release}': {e}")

            changes_files = [os.path.basename(cf) for cf, env in package_changes]
            devel_changes_files = set(os.path.join(OUTPUT_DIR, file) if releases[0] in file else None for file in changes_files)
            if args.skip_dput:
                for changes_file in devel_changes_files:
                    if changes_file:
                        futures.add(executor.submit(run_source_lintian, name, changes_file))
            else:
                upload_target = package_changes[0][1]["UPLOAD_TARGET"]
                futures.add(executor.submit(dput_source, name, upload_target, changes_files, devel_changes_files))

            os.remove(os.path.join(BASE_DIR, f"{name}_MAIN.orig.tar.gz"))

        futures = set(executor.submit(prepare_package, pkg) for pkg in packages)

        while futures:
            done, not_done = wait(futures, return_when=FIRST_COMPLETED)

            for future in done:
                try:
                    result = future.result()
                except Exception as e:
                    logging.exception("Task generated an exception")
                finally:
                    futures.remove(future)

    if not args.skip_cleanup:
        shutil.rmtree(OUTPUT_DIR)
    logging.info("Publishing Lintian output...")
    publish_lintian()
    clean_old_logs(LOG_DIR)

    logging.info("Script completed successfully.")

if __name__ == "__main__":
    main()