"""
JCL Runner - Main entry point.
Usage: python main.py <jcl_file>
"""

import sys
import argparse
from pathlib import Path

from parser import parse_jcl
from executor import Executor


def main():
    parser = argparse.ArgumentParser(
        description="JCL Runner - Execute JCL scripts on Windows"
    )
    parser.add_argument("jcl_file", help="Path to JCL script")
    parser.add_argument(
        "--root",
        default=".",
        help="System root directory (default: current dir)",
    )
    parser.add_argument(
        "--cobol-dir",
        default="cobol",
        help="COBOL source directory (relative to root)",
    )
    parser.add_argument(
        "--copybook-dir",
        default="copybooks",
        help="COPYBOOK directory (relative to root)",
    )

    args = parser.parse_args()

    root = Path(args.root).resolve()
    cobol_dir = root / args.cobol_dir
    copybook_dir = root / args.copybook_dir

    # Validate paths
    if not root.exists():
        print(f"ERROR: Root directory not found: {root}")
        sys.exit(1)
    if not cobol_dir.exists():
        print(f"ERROR: COBOL directory not found: {cobol_dir}")
        sys.exit(1)
    if not copybook_dir.exists():
        print(f"ERROR: COPYBOOK directory not found: {copybook_dir}")
        sys.exit(1)

    # Parse JCL
    jcl_path = Path(args.jcl_file)
    if not jcl_path.exists():
        print(f"ERROR: JCL file not found: {jcl_path}")
        sys.exit(1)

    print(f"Parsing JCL: {jcl_path}")
    job = parse_jcl(str(jcl_path))

    if not job:
        print("ERROR: Failed to parse JCL (no JOB statement found)")
        sys.exit(1)

    print(f"Job: {job.job_name}, Steps: {len(job.steps)}")
    for i, step in enumerate(job.steps):
        cond_str = f" COND={step.cond}" if step.cond else ""
        print(f"  {i+1}. {step.step_name}: EXEC PGM={step.program}{cond_str}")

    # Execute
    executor = Executor(
        root_dir=str(root),
        cobol_dir=str(cobol_dir),
        copybook_dir=str(copybook_dir),
    )
    rc = executor.run(job)
    print(f"\nExit code: {rc}")
    sys.exit(rc)


if __name__ == "__main__":
    main()