import os
import argparse
# Import the function that creates the flow
from flow import create_tutorial_flow

# Default file patterns
DEFAULT_INCLUDE_PATTERNS = {
    "*.py", "*.js", "*.ts", "*.go", "*.java", "*.pyi", "*.pyx", 
    "*.c", "*.cc", "*.cpp", "*.h", "*.md", "*.rst", "Dockerfile", 
    "Makefile", "*.yaml", "*.yml"
}

DEFAULT_EXCLUDE_PATTERNS = {
    "*test*", "tests/*", "docs/*", "examples/*", "v1/*", 
    "dist/*", "build/*", "experimental/*", "deprecated/*", 
    "legacy/*", ".git/*", ".github/*"
}

# --- Main Function ---
def main():
    parser = argparse.ArgumentParser(description="Generate a tutorial for a GitHub codebase.")
    parser.add_argument("repo_url", help="URL of the public GitHub repository.")
    parser.add_argument("-n", "--name", help="Project name (optional, derived from URL if omitted).")
    parser.add_argument("-t", "--token", help="GitHub personal access token (optional, reads from GITHUB_TOKEN env var if not provided).")
    parser.add_argument("-o", "--output", default="output", help="Base directory for output (default: ./output).")
    parser.add_argument("-i", "--include", nargs="+", help="Include file patterns (e.g. '*.py' '*.js'). Defaults to common code files if not specified.")
    parser.add_argument("-e", "--exclude", nargs="+", help="Exclude file patterns (e.g. 'tests/*' 'docs/*'). Defaults to test/build directories if not specified.")
    parser.add_argument("-s", "--max-size", type=int, default=100000, help="Maximum file size in bytes (default: 100000, about 100KB).")

    args = parser.parse_args()

    # Get GitHub token from argument or environment variable
    github_token = args.token or os.environ.get('GITHUB_TOKEN')
    if not github_token:
        print("Warning: No GitHub token provided. You might hit rate limits for public repositories.")

    # Initialize the shared dictionary with inputs
    shared = {
        "repo_url": args.repo_url,
        "project_name": args.name, # Can be None, FetchRepo will derive it
        "github_token": github_token,
        "output_dir": args.output, # Base directory for CombineTutorial output

        # Add include/exclude patterns and max file size
        "include_patterns": set(args.include) if args.include else DEFAULT_INCLUDE_PATTERNS,
        "exclude_patterns": set(args.exclude) if args.exclude else DEFAULT_EXCLUDE_PATTERNS,
        "max_file_size": args.max_size,

        # Outputs will be populated by the nodes
        "files": [],
        "abstractions": [],
        "relationships": {},
        "chapter_order": [],
        "chapters": [],
        "final_output_dir": None
    }

    print(f"Starting tutorial generation for: {args.repo_url}")

    # Create the flow instance
    tutorial_flow = create_tutorial_flow()

    # Run the flow
    tutorial_flow.run(shared)
    
if __name__ == "__main__":
    main()