#!/usr/bin/env python3

import argparse
import os
import subprocess
import sys

from .parser import RcclLogParser


def get_mpi_rank():
    """
    Try to get Rank ID from common environment variables.
    If not found, return "0".
    """
    # Common MPI Rank environment variables
    rank_vars = [
        "OMPI_COMM_WORLD_RANK",  # OpenMPI
        "PMI_RANK",  # MPICH / MVAPICH
        "SLURM_PROCID",  # Slurm
        "RANK",  # General / Torch
    ]

    for var in rank_vars:
        if var in os.environ:
            return int(os.environ[var])
    return 0


def main():
    rank = get_mpi_rank()
    log_prefix = f"[Rank {rank}]"

    # Parse command line arguments
    parser = argparse.ArgumentParser(
        description="RCCL Log Parser Wrapper\n\n"
        "Usage modes:\n"
        "  1. Pipe input:    cat log.txt | xcl-lens\n"
        "  2. Read files:    xcl-lens log1.txt log2.txt\n"
        "  3. Wrap command:  xcl-lens ./all_reduce_perf",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )
    parser.add_argument("--summary", action="store_true", help="Print summary report only")
    parser.add_argument("-v", "--verbose", action="store_true", help="Print verbose reports")
    parser.add_argument(
        "command", nargs=argparse.REMAINDER, help="Executable to run, or log files to read"
    )

    args = parser.parse_args()

    cmd = args.command

    # Case 1: No command provided - check for stdin
    if not cmd:
        if not sys.stdin.isatty():
            try:
                rccl_parser = RcclLogParser()
                for line in sys.stdin:
                    if not args.summary:
                        print(f"{line}", end="", flush=True)
                    rccl_parser.collect(line)

                if rank == 0:
                    rccl_parser.report(verbose=args.verbose)
                sys.exit(0)
            except KeyboardInterrupt:
                sys.exit(130)
        else:
            if rank == 0:
                parser.print_help()
            sys.exit(1)

    # Case 2: Check if first argument is an existing file (treat as log file)
    if os.path.isfile(cmd[0]):
        try:
            rccl_parser = RcclLogParser()
            for filename in cmd:
                if not os.path.isfile(filename):
                    print(f"{log_prefix} Error: File not found: {filename}")
                    sys.exit(1)
                with open(filename, encoding="utf-8", errors="replace") as f:
                    for line in f:
                        if not args.summary:
                            print(f"{line}", end="", flush=True)
                        rccl_parser.collect(line)

            if rank == 0:
                rccl_parser.report(verbose=args.verbose)
            sys.exit(0)
        except KeyboardInterrupt:
            sys.exit(130)

    # Get the environment variables
    env = os.environ.copy()

    # Inject RCCL environment variables
    env["NCCL_DEBUG"] = "INFO"
    env["NCCL_DEBUG_SUBSYS"] = "ALL"

    print(f"{log_prefix} [Wrapper] Running command: {' '.join(cmd)}")

    try:
        parser = RcclLogParser()
        process = subprocess.Popen(
            cmd,
            env=env,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            text=True,
            bufsize=1,
        )

        # Collect all output lines
        for line in process.stdout:
            if not args.summary:
                print(f"{line}", end="", flush=True)
            parser.collect(line)

        process.wait()

        if rank == 0:
            parser.report(verbose=args.verbose)

        sys.exit(process.returncode)
    except KeyboardInterrupt:
        sys.exit(130)
    except FileNotFoundError:
        print(f"{log_prefix} Error: Command not found: {cmd[0]}")
        sys.exit(1)


if __name__ == "__main__":
    main()