#!/usr/bin/env python

# Usage: ./build.py INPUT_DIR OUTPUT_FILE

# import re
import os
import sys
import subprocess

def gx_usage():
    """Show usage"""
    print(f"Usage: {sys.argv[0]} METADATA_FILE INPUT_FILE OUTPUT_FILE")
    print()


def run_process_with_params(command_params):
    """
    Runs a process with parameters provided in the command_params list.

    Args:
    - command_params (list): List of parameters to run the process. 
      The first item in the list should be the command (executable).
    """
    try:
        # Run the process using subprocess.run (Python 3.5+)
        result = subprocess.run(command_params, check=True, text=True, capture_output=True)
        
        # If the process ran successfully, print the output
        print("Process output:", result.stdout)
        print("Process error output (if any):", result.stderr)
    except subprocess.CalledProcessError as e:
        print(f"An error occurred while running the process: {e}")
        print("Error Output:", e.stderr)
    except Exception as e:
        print(f"Unexpected error: {e}")

# Example usage
if __name__ == "__main__":
    # Define the parameters for the command
    # Example: Running `ls -l /home` on a Unix-like system
    if len(sys.argv) != 4:
        gx_usage()

    metadata_file = sys.argv[1]
    if not os.path.exists(metadata_file):
        print(f"Metadata file not found: {metadata_file}")
        sys.exit(1)

    input_file = sys.argv[2]
    if not os.path.exists(input_file):
        print(f"Input file not found: {input_file}")
        sys.exit(1)

    # Get second
    output_file = sys.argv[3]
    if os.path.exists(output_file):
        print(f"Output file already exists: {output_file}")
        sys.exit(1)

    # Build the pandoc options as a string
    pandoc_cmd = [
        "pandoc",
        "--verbose",
        "--toc",
        "--number-sections",
        "--include-in-header", "utils/docs/main.tex",
        "--metadata-file", metadata_file,
        # "-V", "linkcolor:blue",
        # "-V", "geometry:a4paper",
        # "-V", "geometry:margin=1.8cm",
        "-V", "mainfont=DejaVu Serif",
        "-V", "monofont=Noto Sans Mono",
        "--pdf-engine=xelatex",
        "--resource-path=utils/docs",
        "--filter=./utils/docs/filter-nobg.hs",
        "-f", "markdown",
        "-t", "pdf",
        "-o", output_file,
        input_file
    ]

    print(f"Metadata: {metadata_file}")
    print(f"Input: {input_file}")
    print(f"Output: {output_file}")

    # Call the function to run the process
    run_process_with_params(pandoc_cmd)

#