#!/usr/bin/env python3
"""
Progress tracking via file-based status updates
Allows background processing while UI stays responsive
"""
import json
import os
from pathlib import Path
from typing import Optional

PROGRESS_FILE = "/tmp/processing_status.json"

def init_progress():
    """Initialize progress tracking"""
    status = {
        "active": False,
        "message": "",
        "progress": 0,
        "stage": "",
        "error": None,
        "complete": False
    }
    with open(PROGRESS_FILE, "w") as f:
        json.dump(status, f)

def update_progress(message: str, progress: int = None, stage: str = None):
    """Update progress status"""
    try:
        if os.path.exists(PROGRESS_FILE):
            with open(PROGRESS_FILE, "r") as f:
                status = json.load(f)
        else:
            status = {"active": True, "message": "", "progress": 0, "stage": "", "error": None, "complete": False}
        
        status["message"] = message
        status["active"] = True
        if progress is not None:
            status["progress"] = progress
        if stage is not None:
            status["stage"] = stage
            
        with open(PROGRESS_FILE, "w") as f:
            json.dump(status, f)
    except Exception:
        pass  # Fail silently to not interrupt processing

def mark_complete(success: bool = True, error: str = None):
    """Mark processing as complete"""
    try:
        if os.path.exists(PROGRESS_FILE):
            with open(PROGRESS_FILE, "r") as f:
                status = json.load(f)
        else:
            status = {}
            
        status["active"] = False
        status["complete"] = True
        status["progress"] = 100 if success else status.get("progress", 0)
        if error:
            status["error"] = error
            
        with open(PROGRESS_FILE, "w") as f:
            json.dump(status, f)
    except Exception:
        pass

def get_progress() -> dict:
    """Read current progress status"""
    try:
        if os.path.exists(PROGRESS_FILE):
            with open(PROGRESS_FILE, "r") as f:
                return json.load(f)
    except Exception:
        pass
    return {"active": False, "message": "", "progress": 0, "stage": "", "error": None, "complete": False}