#!/usr/bin/env python3
"""
Validate GitHub Actions workflow files.

Copyright (C) 2025 Moko Consulting <hello@mokoconsulting.tech>

This file is part of a Moko Consulting project.

SPDX-License-Identifier: GPL-3.0-or-later

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program (./LICENSE.md).

FILE INFORMATION
DEFGROUP: Script.Validate
INGROUP: CI.Validation
REPO: https://github.com/mokoconsulting-tech/moko-cassiopeia
PATH: /scripts/validate/workflows.py
VERSION: 01.00.00
BRIEF: Validate GitHub Actions workflow files
NOTE: Checks YAML syntax, structure, and best practices
"""

import sys
from pathlib import Path

# Add lib directory to path
sys.path.insert(0, str(Path(__file__).parent.parent / "lib"))

try:
	import common
except ImportError:
	print("ERROR: Cannot import required libraries", file=sys.stderr)
	sys.exit(1)


def validate_yaml_syntax(filepath: Path) -> bool:
	"""
	Validate YAML syntax of a workflow file.
	
	Args:
		filepath: Path to workflow file
		
	Returns:
		True if valid
	"""
	try:
		import yaml
	except ImportError:
		common.log_warn("PyYAML module not installed. Install with: pip3 install pyyaml")
		return True  # Skip validation if yaml not available
	
	try:
		with open(filepath, 'r', encoding='utf-8') as f:
			yaml.safe_load(f)
		print(f"✓ Valid YAML: {filepath.name}")
		return True
	except yaml.YAMLError as e:
		print(f"✗ YAML Error in {filepath.name}: {e}", file=sys.stderr)
		return False
	except Exception as e:
		print(f"✗ Error reading {filepath.name}: {e}", file=sys.stderr)
		return False


def check_no_tabs(filepath: Path) -> bool:
	"""
	Check that file contains no tab characters.
	
	Args:
		filepath: Path to file
		
	Returns:
		True if no tabs found
	"""
	try:
		with open(filepath, 'r', encoding='utf-8') as f:
			content = f.read()
			if '\t' in content:
				common.log_error(f"✗ File contains tab characters: {filepath.name}")
				return False
	except Exception as e:
		common.log_warn(f"Could not read {filepath}: {e}")
		return False
	
	return True


def check_workflow_structure(filepath: Path) -> bool:
	"""
	Check workflow file structure for required keys.
	
	Args:
		filepath: Path to workflow file
		
	Returns:
		True if structure is valid
	"""
	errors = 0
	
	try:
		with open(filepath, 'r', encoding='utf-8') as f:
			content = f.read()
		
		# Check for required top-level keys
		if 'name:' not in content and not content.startswith('name:'):
			common.log_warn(f"Missing 'name:' in {filepath.name}")
		
		if 'on:' not in content and not content.startswith('on:'):
			common.log_error(f"✗ Missing 'on:' trigger in {filepath.name}")
			errors += 1
		
		if 'jobs:' not in content and not content.startswith('jobs:'):
			common.log_error(f"✗ Missing 'jobs:' in {filepath.name}")
			errors += 1
			
	except Exception as e:
		common.log_error(f"Error reading {filepath}: {e}")
		return False
	
	return errors == 0


def validate_workflow_file(filepath: Path) -> bool:
	"""
	Validate a single workflow file.
	
	Args:
		filepath: Path to workflow file
		
	Returns:
		True if valid
	"""
	common.log_info(f"Validating: {filepath.name}")
	
	errors = 0
	
	# Check YAML syntax
	if not validate_yaml_syntax(filepath):
		errors += 1
	
	# Check for tabs
	if not check_no_tabs(filepath):
		errors += 1
	
	# Check structure
	if not check_workflow_structure(filepath):
		errors += 1
	
	if errors == 0:
		common.log_info(f"✓ {filepath.name} passed all checks")
		return True
	else:
		common.log_error(f"✗ {filepath.name} failed {errors} check(s)")
		return False


def main() -> int:
	"""Main entry point."""
	common.log_info("GitHub Actions Workflow Validation")
	common.log_info("===================================")
	print()
	
	workflows_dir = Path(".github/workflows")
	
	if not workflows_dir.is_dir():
		common.log_error(f"Workflows directory not found: {workflows_dir}")
		return 1
	
	# Find all workflow files
	workflow_files = []
	for pattern in ["*.yml", "*.yaml"]:
		workflow_files.extend(workflows_dir.glob(pattern))
	
	if not workflow_files:
		common.log_warn("No workflow files found")
		return 0
	
	total = len(workflow_files)
	passed = 0
	failed = 0
	
	for workflow in workflow_files:
		if validate_workflow_file(workflow):
			passed += 1
		else:
			failed += 1
		print()
	
	common.log_info("===================================")
	common.log_info("Summary:")
	common.log_info(f"  Total workflows: {total}")
	common.log_info(f"  Passed: {passed}")
	common.log_info(f"  Failed: {failed}")
	common.log_info("===================================")
	
	if failed > 0:
		common.log_error("Workflow validation failed")
		return 1
	
	common.log_info("All workflows validated successfully")
	return 0


if __name__ == "__main__":
	sys.exit(main())