import io
import os
import re
import pathlib
import shutil
from loguru import logger
import subprocess
from typing import List

UPLOAD_DIRECTORY = pathlib.Path("/app/uploaded_files")
CONFIG_PATH = pathlib.Path("/app/yourbench_config.yml")

# Ensure the upload directory exists
UPLOAD_DIRECTORY.mkdir(parents=True, exist_ok=True)

STAGES = [
    "ingestion",
    "upload_ingest_to_hub",
    "summarization",
    "chunking",
    "single_shot_question_generation",
    "multi_hop_question_generation",
    "answer_generation",
    "judge_answers",
]


def save_files(files: List[pathlib.Path]) -> str:
    """Save uploaded files to the UPLOAD_DIRECTORY safely"""
    saved_paths = []

    for file in files:
        try:
            source_path = pathlib.Path(file)
            destination_path = UPLOAD_DIRECTORY / source_path.name

            if not source_path.exists():
                print(f"File not found: {source_path}")
                continue  # Skip missing files

            shutil.move(str(source_path), str(destination_path))
            saved_paths.append(str(destination_path))

        except Exception as e:
            print(f"Error moving file {file}: {e}")

    return (
        f"Files saved to: {', '.join(saved_paths)}"
        if saved_paths
        else "No files were saved"
    )


class SubprocessManager:
    def __init__(self, command):
        self.command = command
        self.process = None
        self.output_stream = io.StringIO()

    def start_process(self, custom_env: dict | None):
        """Start the subprocess."""
        if self.is_running():
            logger.info("Process is already running")
            return

        self.output_stream = io.StringIO()
        self.process = subprocess.Popen(
            self.command,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,  # Combine stderr with stdout
            text=True,
            bufsize=1,
            start_new_session=True,
            env=custom_env,
        )
        os.set_blocking(self.process.stdout.fileno(), False)
        logger.info("Started the process")

    def read_and_get_output(self):
        """Read subprocess output, capture it, and return log and completed stages."""
        if self.process and self.process.stdout:
            try:
                while True:
                    line = self.process.stdout.readline()
                    if line:
                        self.output_stream.write(line)
                    else:
                        break
            except BlockingIOError:
                pass

        current_output = self.output_stream.getvalue()
        completed_stages = list(
            set(re.findall(r"Successfully completed stage: (\w+)", current_output))
        )
        return current_output, completed_stages

    def stop_process(self):
        """Terminate the subprocess."""
        if not self.is_running():
            logger.info("Process is not running")
            return
        logger.info("Sending SIGTERM to the Process")
        self.process.terminate()
        exit_code = self.process.wait()  # Wait for process to terminate
        logger.info(f"Process stopped exit code {exit_code}")
        # return exit_code

    def kill_process(self):
        """Forcefully kill the subprocess"""
        if not self.is_running():
            logger.info("Process is not running")
            return
        logger.info("Sending SIGKILL to the Process")
        self.process.kill()
        exit_code = self.process.wait()  # Wait for process to be killed
        logger.info(f"Process killed exit code {exit_code}")
        # return exit_code

    def is_running(self):
        """Check if the subprocess is still running"""
        return self.process and self.process.poll() is None