#!/usr/bin/env -S uv run --script
# /// script
# dependencies = [
#   "requests",
#   "pyyaml"
# ]
# ///

# vim: filetype=python

"""
RPM Builder Tool

A Python replacement for the Makefile-based build system.
Builds RPM packages using Docker and checks for existing packages via Gitea API.
"""

import os
import sys
import argparse
import logging
import subprocess
import tempfile
import shutil
import requests
from pathlib import Path
from typing import List, Tuple, Optional, Dict
from concurrent.futures import ThreadPoolExecutor, as_completed


# ==================== GITEA API FUNCTIONS ====================

def normalize_version(version: str) -> str:
    """
    Normalize version string by removing leading zeros from numeric components.
    Gitea automatically does this normalization.

    Examples:
        "2025.08.03" -> "2025.8.3"
        "1.05.0" -> "1.5.0"
        "0.6.1" -> "0.6.1" (no change needed)

    Args:
        version: Original version string

    Returns:
        Normalized version string
    """
    import re

    # Split by common separators and normalize each numeric part
    parts = re.split(r'([.\-_])', version)
    normalized_parts = []

    for part in parts:
        # If this part is purely numeric and has leading zeros, remove them
        if part.isdigit() and len(part) > 1 and part.startswith('0'):
            # Remove leading zeros but keep at least one digit
            normalized_parts.append(str(int(part)))
        else:
            normalized_parts.append(part)

    return ''.join(normalized_parts)


def check_package_exists(package_name: str, version: str, release: str) -> bool:
    """
    Check if a package version exists in the Gitea package registry.

    Args:
        package_name: Name of the package
        version: Version string
        release: Release number

    Returns:
        True if package exists, False otherwise
    """
    logger = logging.getLogger(__name__)

    # Get configuration from environment
    base_url = os.getenv('GITEA_URL', 'https://git.unkin.net')
    api_token = os.getenv('GITEA_API_TOKEN')
    owner = os.getenv('GITEA_OWNER', 'unkin')
    package_type = os.getenv('GITEA_PACKAGE_TYPE', 'rpm')

    if not api_token:
        logger.warning("No GITEA_API_TOKEN found. API requests may fail for private repos.")

    try:
        # Normalize version by removing leading zeros (Gitea does this automatically)
        # e.g., "2025.08.03" becomes "2025.8.3"
        normalized_version = normalize_version(version)
        full_version = f"{normalized_version}-{release}"
        url = (
            f"{base_url}/api/v1/packages/{owner}/"
            f"{package_type}/{package_name}/{full_version}"
        )

        headers = {}
        if api_token:
            headers['Authorization'] = f'token {api_token}'

        logger.debug(f"Checking package existence: {url}")
        response = requests.get(url, headers=headers, timeout=30)

        if response.status_code == 200:
            package_info = response.json()
            # Package exists if we get package info back
            exists = bool(package_info.get('id'))
            logger.debug(f"Package {package_name}:{full_version} {'exists' if exists else 'not found'}")
            return exists
        elif response.status_code == 404:
            logger.debug(f"Package {package_name}:{full_version} not found (404)")
            return False
        elif response.status_code == 401:
            logger.error("Authentication failed. Check GITEA_API_TOKEN.")
            return False
        else:
            logger.warning(
                f"Unexpected response checking package {package_name}:{full_version}: "
                f"{response.status_code} - {response.text}"
            )
            return False

    except requests.RequestException as e:
        logger.error(f"Failed to check package {package_name}:{version}-{release}: {e}")
        return False


def get_package_full_name(package_name: str, version: str, release: str) -> str:
    """
    Generate the full package name as used in the registry.

    Args:
        package_name: Package name
        version: Version string
        release: Release number

    Returns:
        Full package name string
    """
    return f"{package_name}-{version}-{release}"


# ==================== DOCKER FUNCTIONS ====================

def check_docker_available() -> bool:
    """
    Check if Docker is available and running.

    Returns:
        True if Docker is available, False otherwise
    """
    try:
        result = subprocess.run(
            ['docker', 'version'],
            capture_output=True,
            text=True,
            timeout=10
        )
        return result.returncode == 0
    except (subprocess.TimeoutExpired, FileNotFoundError):
        return False


def cleanup_container(container_name: str) -> None:
    """
    Remove a Docker container.

    Args:
        container_name: Name of the container to remove
    """
    logger = logging.getLogger(__name__)
    try:
        remove_args = ['docker', 'rm', container_name]
        logger.debug(f"Running: {' '.join(remove_args)}")
        subprocess.run(remove_args, capture_output=True, text=True)
    except Exception as e:
        logger.warning(f"Failed to remove container {container_name}: {e}")


def get_base_image_from_metadata(package_dir: Path, distro: str = "el/9") -> str:
    """
    Get the base image from package metadata.yaml.

    Args:
        package_dir: Directory containing the package
        distro: Target distro (default: el/9)

    Returns:
        Base image URL or default if not found
    """
    metadata_file = package_dir / "metadata.yaml"
    default_image = "git.unkin.net/unkin/almalinux9-rpmbuilder:latest"

    if not metadata_file.exists():
        return default_image

    try:
        import yaml
        with open(metadata_file, 'r') as f:
            metadata = yaml.safe_load(f)

        build_configs = metadata.get('build', [])
        for config in build_configs:
            if config.get('distro') == distro:
                return config.get('image', default_image)

        # If no matching distro found, return first image or default
        if build_configs:
            return build_configs[0].get('image', default_image)

        return default_image

    except Exception:
        return default_image


def build_package_docker(
    package_dir: Path,
    package_name: str,
    package_version: str,
    package_release: str,
    dist_dir: Path,
    base_image: str = "git.unkin.net/unkin/almalinux9-rpmbuilder:latest",
    dry_run: bool = False
) -> bool:
    """
    Build a package using Docker with central Dockerfile.

    Args:
        package_dir: Directory containing the package resources
        package_name: Name of the package
        package_version: Package version
        package_release: Package release number
        dist_dir: Directory to store built packages
        base_image: Base Docker image to use for building
        dry_run: If True, only show what would be done

    Returns:
        True if build succeeded, False otherwise
    """
    logger = logging.getLogger(__name__)

    try:
        # Ensure dist directory exists
        package_dist_dir = dist_dir / package_name
        if not dry_run:
            package_dist_dir.mkdir(parents=True, exist_ok=True)

        # Generate Docker image name
        image_name = f"{package_name.lower()}-builder"
        container_name = f"{package_name}-{package_version}-builder"

        logger.info(f"Building RPM for {package_name} version {package_version}")

        if dry_run:
            logger.info(f"[DRY RUN] Would build Docker image: {image_name}")
            logger.info(f"[DRY RUN] Would use base image: {base_image}")
            logger.info(f"[DRY RUN] Would create container: {container_name}")
            logger.info(f"[DRY RUN] Would copy artifacts to: {package_dist_dir}")
            return True

        # Step 1: Build Docker image using central Dockerfile
        central_dockerfile = package_dir.parent.parent / "Dockerfile"
        build_args = [
            'docker', 'build',
            '-f', str(central_dockerfile),
            '--build-arg', f'BASE_IMAGE={base_image}',
            '--build-arg', f'PACKAGE_VERSION={package_version}',
            '--build-arg', f'PACKAGE_RELEASE={package_release}',
            '-t', image_name,
            str(package_dir)
        ]

        logger.debug(f"Running: {' '.join(build_args)}")
        result = subprocess.run(
            build_args,
            capture_output=True,
            text=True,
            cwd=package_dir
        )

        if result.returncode != 0:
            logger.error(f"Docker build failed for {package_name}")
            logger.error(f"stdout: {result.stdout}")
            logger.error(f"stderr: {result.stderr}")
            return False

        # Step 2: Create and start container
        create_args = [
            'docker', 'create',
            '--name', container_name,
            image_name
        ]

        logger.debug(f"Running: {' '.join(create_args)}")
        result = subprocess.run(create_args, capture_output=True, text=True)

        if result.returncode != 0:
            logger.error(f"Container creation failed for {package_name}")
            logger.error(f"stderr: {result.stderr}")
            return False

        try:
            # Step 3: Start container
            start_args = ['docker', 'start', '-a', container_name]
            logger.debug(f"Running: {' '.join(start_args)}")
            result = subprocess.run(start_args, capture_output=True, text=True)

            if result.returncode != 0:
                logger.error(f"Container execution failed for {package_name}")
                logger.error(f"stdout: {result.stdout}")
                logger.error(f"stderr: {result.stderr}")
                return False

            # Step 4: Copy artifacts
            copy_args = [
                'docker', 'cp',
                f"{container_name}:/app/dist/.",
                str(package_dist_dir) + "/"
            ]

            logger.debug(f"Running: {' '.join(copy_args)}")
            result = subprocess.run(copy_args, capture_output=True, text=True)

            if result.returncode != 0:
                logger.error(f"Failed to copy artifacts for {package_name}")
                logger.error(f"stderr: {result.stderr}")
                return False

            logger.info(f"Successfully built {package_name}-{package_version}-{package_release}")
            return True

        finally:
            # Step 5: Clean up container
            cleanup_container(container_name)

    except Exception as e:
        logger.error(f"Unexpected error building {package_name}: {e}")
        return False


def cleanup_images(image_pattern: str = "*-builder") -> None:
    """
    Clean up Docker images matching a pattern.

    Args:
        image_pattern: Pattern to match image names
    """
    logger = logging.getLogger(__name__)
    try:
        # List images matching pattern
        list_args = ['docker', 'images', '--format', '{{.Repository}}', '--filter', f'reference={image_pattern}']
        result = subprocess.run(list_args, capture_output=True, text=True)

        if result.returncode == 0 and result.stdout.strip():
            images = result.stdout.strip().split('\n')
            if images:
                remove_args = ['docker', 'rmi'] + images
                subprocess.run(remove_args, capture_output=True, text=True)
                logger.info(f"Cleaned up {len(images)} Docker images")
    except Exception as e:
        logger.warning(f"Failed to clean up Docker images: {e}")


# ==================== PACKAGE INFO CLASS ====================

class PackageInfo:
    """Information about a package to build."""

    def __init__(self, name: str, version: str, release: str, directory: Path, distro: str = 'el/9', base_image: str = None):
        self.name = name
        self.version = version
        self.release = release
        self.directory = directory
        self.distro = distro
        self.base_image = base_image or "git.unkin.net/unkin/almalinux9-rpmbuilder:latest"

    def __str__(self):
        return f"{self.name}-{self.version}-{self.release} ({self.distro})"


# ==================== BUILDER CLASS ====================

class Builder:
    """Main builder class that orchestrates package building."""

    def __init__(self, root_dir: Path):
        """
        Initialize the builder.

        Args:
            root_dir: Root directory of the project
        """
        self.root_dir = root_dir
        self.rpms_dir = root_dir / "rpms"
        self.dist_dir = root_dir / "dist"

        self.logger = logging.getLogger(__name__)

        # Ensure dist directory exists
        self.dist_dir.mkdir(exist_ok=True)

    def discover_packages(self, distro: str = 'el/9') -> List[PackageInfo]:
        """
        Discover all packages and their versions from metadata.yaml files.

        Args:
            distro: Target distro (e.g., 'el/8', 'el/9', 'all')

        Returns:
            List of PackageInfo objects
        """
        packages = []

        if not self.rpms_dir.exists():
            self.logger.error(f"RPMs directory not found: {self.rpms_dir}")
            return packages

        for package_dir in self.rpms_dir.iterdir():
            if not package_dir.is_dir() or package_dir.name.startswith('.'):
                continue

            metadata_file = package_dir / "metadata.yaml"
            if not metadata_file.exists():
                self.logger.warning(f"No metadata.yaml found for {package_dir.name}")
                continue

            try:
                import yaml
                with open(metadata_file, 'r') as f:
                    metadata = yaml.safe_load(f)

                package_name = metadata.get('name', package_dir.name)
                version = metadata.get('version')
                release = metadata.get('release')
                build_configs = metadata.get('build', [])

                if not version:
                    self.logger.warning(f"No version in metadata.yaml for {package_name}")
                    continue

                if not release:
                    self.logger.warning(f"No release in metadata.yaml for {package_name}")
                    continue

                # Handle distro filtering
                if distro == 'all':
                    # Build for all configured distros
                    for build_config in build_configs:
                        if isinstance(build_config, dict):
                            build_distro = build_config.get('distro')
                            base_image = build_config.get('image')
                            if build_distro and base_image:
                                packages.append(PackageInfo(package_name, version, str(release), package_dir, build_distro, base_image))
                else:
                    # Build for specific distro
                    for build_config in build_configs:
                        if isinstance(build_config, dict) and build_config.get('distro') == distro:
                            base_image = build_config.get('image')
                            if base_image:
                                packages.append(PackageInfo(package_name, version, str(release), package_dir, distro, base_image))
                                break
                    else:
                        # If no matching distro found, log a warning
                        self.logger.debug(f"No build config for {distro} found for {package_name}")

            except Exception as e:
                self.logger.error(f"Error reading metadata.yaml for {package_dir.name}: {e}")
                continue

        return packages

    def build_single(
        self,
        package: str,
        version: str,
        release: str,
        dry_run: bool = False,
        force: bool = False,
        distro: str = 'el/9'
    ) -> bool:
        """
        Build a single package.

        Args:
            package: Package name
            version: Package version
            release: Package release
            dry_run: If True, only show what would be done
            force: If True, build even if package exists
            distro: Target distro (e.g., 'el/8', 'el/9', 'all')

        Returns:
            True if build succeeded, False otherwise
        """
        package_dir = self.rpms_dir / package

        if not package_dir.exists():
            self.logger.error(f"Package directory not found: {package_dir}")
            return False

        # Read metadata.yaml to validate version/release
        metadata_file = package_dir / "metadata.yaml"
        if not metadata_file.exists():
            self.logger.error(f"metadata.yaml not found: {metadata_file}")
            return False

        try:
            import yaml
            with open(metadata_file, 'r') as f:
                metadata = yaml.safe_load(f)

            metadata_version = metadata.get('version')
            metadata_release = metadata.get('release')

            if metadata_version != version:
                self.logger.error(
                    f"Version mismatch for {package}: "
                    f"provided {version} but metadata.yaml has {metadata_version}"
                )
                return False

            if str(metadata_release) != str(release):
                self.logger.error(
                    f"Release mismatch for {package}: "
                    f"provided {release} but metadata.yaml has {metadata_release}"
                )
                return False

            # Find base image for the specified distro
            build_configs = metadata.get('build', [])
            base_image = None

            if distro == 'all':
                # For single package build, 'all' doesn't make sense, default to el/9
                distro = 'el/9'

            for build_config in build_configs:
                if isinstance(build_config, dict) and build_config.get('distro') == distro:
                    base_image = build_config.get('image')
                    break

            if not base_image:
                self.logger.error(f"No build configuration found for distro {distro} in {package}")
                return False

        except Exception as e:
            self.logger.error(f"Error reading metadata.yaml for {package}: {e}")
            return False

        package_info = PackageInfo(package, version, release, package_dir, distro, base_image)
        return self._build_package(package_info, dry_run, force)

    def build_all(self, dry_run: bool = False, force: bool = False, parallel: int = 4, distro: str = 'el/9') -> bool:
        """
        Build all packages.

        Args:
            dry_run: If True, only show what would be done
            force: If True, build even if packages exist
            parallel: Number of parallel builds
            distro: Target distro (e.g., 'el/8', 'el/9', 'all')

        Returns:
            True if all builds succeeded, False otherwise
        """
        packages = self.discover_packages(distro)

        if not packages:
            self.logger.warning("No packages found to build")
            return True

        self.logger.info(f"Found {len(packages)} packages to process")

        if parallel == 1:
            return self._build_sequential(packages, dry_run, force)
        else:
            return self._build_parallel(packages, dry_run, force, parallel)

    def _build_sequential(self, packages: List[PackageInfo], dry_run: bool, force: bool) -> bool:
        """Build packages sequentially."""
        success_count = 0

        for package_info in packages:
            if self._build_package(package_info, dry_run, force):
                success_count += 1

        self.logger.info(f"Built {success_count}/{len(packages)} packages successfully")
        return success_count == len(packages)

    def _build_parallel(self, packages: List[PackageInfo], dry_run: bool, force: bool, parallel: int) -> bool:
        """Build packages in parallel."""
        success_count = 0

        with ThreadPoolExecutor(max_workers=parallel) as executor:
            # Submit all build tasks
            future_to_package = {
                executor.submit(self._build_package, pkg, dry_run, force): pkg
                for pkg in packages
            }

            # Process completed builds
            for future in as_completed(future_to_package):
                package_info = future_to_package[future]
                try:
                    success = future.result()
                    if success:
                        success_count += 1
                except Exception as e:
                    self.logger.error(f"Build failed for {package_info}: {e}")

        self.logger.info(f"Built {success_count}/{len(packages)} packages successfully")
        return success_count == len(packages)

    def _build_package(self, package_info: PackageInfo, dry_run: bool, force: bool) -> bool:
        """
        Build a single package.

        Args:
            package_info: Package information
            dry_run: If True, only show what would be done
            force: If True, build even if package exists

        Returns:
            True if build succeeded, False otherwise
        """
        try:
            # Check if package already exists (unless forced)
            if not force:
                # Check if we have GITEA_API_TOKEN for reliable package checking
                api_token = os.getenv('GITEA_API_TOKEN')
                if not api_token:
                    self.logger.error(
                        f"Skipping {package_info} - GITEA_API_TOKEN missing. "
                        "Cannot verify if package already exists. Use --force to build anyway."
                    )
                    return False

                if check_package_exists(
                    package_info.name,
                    package_info.version,
                    package_info.release
                ):
                    self.logger.info(
                        f"Skipping {package_info} (already exists in repository)"
                    )
                    return True

            # Check Docker is available (unless dry run)
            if not dry_run and not check_docker_available():
                self.logger.error("Docker is not available or running")
                return False

            # Build the package
            return build_package_docker(
                package_dir=package_info.directory,
                package_name=package_info.name,
                package_version=package_info.version,
                package_release=package_info.release,
                dist_dir=self.dist_dir,
                base_image=package_info.base_image,
                dry_run=dry_run
            )

        except Exception as e:
            self.logger.error(f"Failed to build {package_info}: {e}")
            return False

    def list_packages(self) -> None:
        """List all available packages."""
        packages = self.discover_packages()

        if not packages:
            print("No packages found")
            return

        print("Available packages:")
        for package_info in sorted(packages, key=lambda p: (p.name, p.version)):
            print(f"  {package_info}")

    def clean_dist(self) -> None:
        """Clean the dist directory."""
        if self.dist_dir.exists():
            import shutil
            shutil.rmtree(self.dist_dir)
            self.dist_dir.mkdir()
            self.logger.info("Cleaned dist directory")


# ==================== MAIN FUNCTIONS ====================

def setup_logging(verbose=False):
    """Set up logging configuration."""
    level = logging.DEBUG if verbose else logging.INFO
    logging.basicConfig(
        level=level,
        format='%(asctime)s - %(levelname)s - %(message)s',
        datefmt='%H:%M:%S'
    )


def main():
    """Main entry point."""
    parser = argparse.ArgumentParser(
        description='Build RPM packages using Docker',
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  %(prog)s --package consul --version 1.21.1 --release 1
  %(prog)s --package consul (uses version/release from metadata.yaml)
  %(prog)s --package consul --distro el/8 (build for el/8)
  %(prog)s --all (builds all packages for el/9 by default)
  %(prog)s --all --distro el/8 (builds all packages for el/8)
  %(prog)s --all --distro all (builds all packages for all distros)
  %(prog)s --all --dry-run
        """
    )

    # Package selection arguments
    group = parser.add_mutually_exclusive_group(required=True)
    group.add_argument('--package', help='Package name to build')
    group.add_argument('--all', action='store_true', help='Build all packages')

    # Version and release (optional for single package builds, read from metadata.yaml if not provided)
    parser.add_argument('--version', help='Package version (optional, read from metadata.yaml if not provided)')
    parser.add_argument('--release', help='Package release number (optional, read from metadata.yaml if not provided)')

    # Optional arguments
    parser.add_argument('--distro', default='el/9', help='Build for specific distro (default: el/9). Use "all" to build for all distros.')
    parser.add_argument('--dry-run', action='store_true', help='Show what would be built without building')
    parser.add_argument('--force', action='store_true', help='Build even if package exists in registry')
    parser.add_argument('--verbose', '-v', action='store_true', help='Enable verbose logging')
    parser.add_argument('--parallel', type=int, default=4, help='Number of parallel builds (default: 4)')

    args = parser.parse_args()

    # No validation needed - version/release will be read from metadata.yaml if not provided

    setup_logging(args.verbose)

    try:
        # Initialize components
        root_dir = Path(__file__).parent.parent
        builder = Builder(root_dir)

        # Execute build
        if args.all:
            success = builder.build_all(
                dry_run=args.dry_run,
                force=args.force,
                parallel=args.parallel,
                distro=args.distro
            )
        else:
            # Read version/release from metadata.yaml if not provided
            version = args.version
            release = args.release

            if not version or not release:
                package_dir = builder.rpms_dir / args.package
                metadata_file = package_dir / "metadata.yaml"

                if not metadata_file.exists():
                    logging.error(f"metadata.yaml not found for package {args.package}")
                    sys.exit(1)

                try:
                    import yaml
                    with open(metadata_file, 'r') as f:
                        metadata = yaml.safe_load(f)

                    if not version:
                        version = metadata.get('version')
                        if not version:
                            logging.error(f"No version in metadata.yaml for {args.package}")
                            sys.exit(1)

                    if not release:
                        release = metadata.get('release')
                        if not release:
                            logging.error(f"No release in metadata.yaml for {args.package}")
                            sys.exit(1)

                except Exception as e:
                    logging.error(f"Error reading metadata.yaml for {args.package}: {e}")
                    sys.exit(1)

            success = builder.build_single(
                package=args.package,
                version=version,
                release=str(release),
                dry_run=args.dry_run,
                force=args.force,
                distro=args.distro
            )

        sys.exit(0 if success else 1)

    except KeyboardInterrupt:
        logging.info("Build interrupted by user")
        sys.exit(130)
    except Exception as e:
        logging.error(f"Build failed: {e}")
        if args.verbose:
            logging.exception("Full traceback:")
        sys.exit(1)


if __name__ == '__main__':
    main()