src/streamlit_app.py

import streamlit as st
import openai
import os
import tempfile
import sys
import io
import subprocess
import importlib.util
import re
from contextlib import redirect_stdout
import textwrap
import shutil
import traceback
import json
from typing import List, Tuple, Optional, Dict
import requests  # Added for downloading from URLs

# Clean up any existing temp files on startup to save space
try:
    tempdir = tempfile.gettempdir()
    for item in os.listdir(tempdir):
        item_path = os.path.join(tempdir, item)
        if item.startswith('tmp') or item.endswith('.py'):
            try:
                if os.path.isfile(item_path):
                    os.unlink(item_path)
                elif os.path.isdir(item_path):
                    shutil.rmtree(item_path)
            except:
                pass
    # Clean pip cache if exists
    pip_cache = os.path.expanduser('~/.cache/pip')
    if os.path.exists(pip_cache):
        try:
            shutil.rmtree(pip_cache)
        except:
            pass
except:
    pass

# Use OpenRouter API (OpenAI-compatible)
OPENROUTER_API_KEY = os.getenv("OPENROUTER_API_KEY")
client = openai.OpenAI(
    api_key=OPENROUTER_API_KEY,
    base_url="https://openrouter.ai/api/v1"
)

MODEL_NAME = "x-ai/grok-4-fast:free"

class ErrorAnalyzer:
    """Analyze errors and suggest fixes"""
    
    @staticmethod
    def analyze_error(error_message: str, code: str) -> Dict:
        """Analyze error and return fix strategy"""
        error_type = "unknown"
        suggestions = []
        packages_to_install = []
        
        # Import errors
        if "No module named" in error_message or "ModuleNotFoundError" in error_message:
            error_type = "import_error"
            module_match = re.search(r"No module named ['\"]([^'\"]+)['\"]", error_message)
            if module_match:
                module = module_match.group(1)
                packages_to_install.append(module)
                suggestions.append(f"Install missing module: {module}")
        
        # Permission errors
        elif "Permission denied" in error_message or "PermissionError" in error_message:
            error_type = "permission_error"
            suggestions.append("Use temp directory for file operations")
            suggestions.append("Avoid system directories")
        
        # Memory errors
        elif "MemoryError" in error_message or "killed" in error_message.lower():
            error_type = "memory_error"
            suggestions.append("Reduce data size or use chunks")
            suggestions.append("Process data in smaller batches")
        
        # File not found
        elif "FileNotFoundError" in error_message or "No such file" in error_message:
            error_type = "file_error"
            suggestions.append("Check file paths")
            suggestions.append("Create directory if needed")
        
        # Syntax errors
        elif "SyntaxError" in error_message:
            error_type = "syntax_error"
            suggestions.append("Fix syntax issues")
            suggestions.append("Check indentation")
        
        # Attribute errors
        elif "AttributeError" in error_message:
            error_type = "attribute_error"
            suggestions.append("Check method/attribute names")
            suggestions.append("Verify object types")
        
        # Type errors
        elif "TypeError" in error_message:
            error_type = "type_error"
            suggestions.append("Check data types")
            suggestions.append("Add type conversions")
        
        # Value errors
        elif "ValueError" in error_message:
            error_type = "value_error"
            suggestions.append("Validate input data")
            suggestions.append("Add error handling")
        
        # Network errors
        elif "URLError" in error_message or "ConnectionError" in error_message:
            error_type = "network_error"
            suggestions.append("Check internet connection")
            suggestions.append("Add retry logic")
        
        # Package specific errors
        if "openpyxl" in error_message or "xlrd" in error_message:
            packages_to_install.append("openpyxl")
            suggestions.append("Install Excel support: openpyxl")
        
        if "PIL" in error_message or "Pillow" in error_message:
            packages_to_install.append("Pillow")
            suggestions.append("Install image processing: Pillow")
        
        return {
            "error_type": error_type,
            "suggestions": suggestions,
            "packages": packages_to_install,
            "original_error": error_message
        }

def indent_code(code, spaces=4):
    """Indent the code by the specified number of spaces."""
    indented_lines = []
    for line in code.split('\n'):
        if line.strip():  # Only indent non-empty lines
            indented_lines.append(' ' * spaces + line)
        else:
            indented_lines.append(line)
    return '\n'.join(indented_lines)

def detect_required_packages(code):
    """Detect required packages from Python code (optimized for accuracy)."""
    required_packages = set()
    
    # Pre-installed packages from requirements.txt
    pre_installed = {
        'gradio', 'openai', 'pillow', 'rembg', 'numpy', 'opencv-python', 'scikit-learn',
        'tensorflow', 'torch', 'lxml', 'requests', 'matplotlib', 'seaborn', 'onnxruntime',
        'proglog', 'openpyxl', 'moviepy'
    }
    
    # Import patterns
    import_patterns = [
        r'^(?:import|from)\s+(\w+)(?:\.\w+)*',
    ]
    
    # Patterns for pip install in code/comments
    pip_patterns = [
        r'#?\s*pip\s+install\s+([^\s#]+)',
        r'#?\s*install\s+([^\s#]+)'
    ]
    
    # Usage patterns that require additional packages
    usage_patterns = {
        r'\.to_excel': 'openpyxl',
        r'\.read_excel': 'openpyxl',
        r'\.ExcelWriter': 'openpyxl',
        r'\.to_parquet': 'pyarrow',
        r'\.read_parquet': 'pyarrow',
        r'\.to_sql': 'sqlalchemy',
        r'\.read_sql': 'sqlalchemy',
        r'\.to_feather': 'pyarrow',
        r'\.read_feather': 'pyarrow',
        r'\.to_stata': 'statsmodels',
        r'\.read_stata': 'statsmodels',
        r'\.to_clipboard': 'pyperclip',
        r'xlsxwriter': 'xlsxwriter',
        r'openpyxl': 'openpyxl',
    }
    
    # Check for pip install comments
    for pattern in pip_patterns:
        matches = re.findall(pattern, code, re.IGNORECASE | re.MULTILINE)
        for match in matches:
            if match and not match.startswith(('"', "'")):
                pkg = match.split('==')[0].split('>')[0].split('<')[0].strip()
                if pkg and pkg not in pre_installed:
                    required_packages.add(pkg)
    
    # Check imports with mapping
    for line in code.split('\n'):
        line = line.strip()
        if line.startswith(('import ', 'from ')):
            match = re.search(import_patterns[0], line)
            if match:
                module = match.group(1)
                if module and module not in {'__future__', 'typing'}:
                    module_map = {
                        'cv2': 'opencv-python',
                        'sklearn': 'scikit-learn',
                        'tf': 'tensorflow',
                        'torch': 'torch',
                        'numpy': 'numpy',
                        'pandas': 'pandas',
                        'PIL': 'Pillow',
                        'pillow': 'Pillow',
                        'matplotlib': 'matplotlib',
                        'seaborn': 'seaborn',
                        'onnxruntime': 'onnxruntime',
                        'rembg': 'rembg',
                        'requests': 'requests',
                        'openpyxl': 'openpyxl',
                        'xlrd': 'xlrd',
                        'xlwt': 'xlwt',
                        'xlsxwriter': 'xlsxwriter',
                        'pyarrow': 'pyarrow',
                        'sqlalchemy': 'sqlalchemy',
                        'psycopg2': 'psycopg2-binary',
                        'pymongo': 'pymongo',
                        'redis': 'redis',
                        'beautifulsoup4': 'beautifulsoup4',
                        'bs4': 'beautifulsoup4',
                        'scrapy': 'scrapy',
                        'selenium': 'selenium',
                        'flask': 'flask',
                        'fastapi': 'fastapi',
                        'django': 'django',
                        'pytest': 'pytest',
                        'hypothesis': 'hypothesis',
                        'faker': 'faker',
                    }
                    if module in module_map:
                        pkg = module_map[module]
                        if pkg not in pre_installed:
                            required_packages.add(pkg)
                    elif module not in {
                        'os', 'sys', 'io', 'json', 're', 'time', 'math', 'random', 'collections',
                        'itertools', 'functools', 'operator', 'string', 'pathlib', 'tempfile',
                        'subprocess', 'logging', 'argparse', 'csv', 'xml', 'html', 'base64',
                        'hashlib', 'urllib', 'http', 'threading', 'multiprocessing', 'socket',
                        'asyncio', 'concurrent', 'abc', 'enum', 'dataclasses', 'zipfile',
                        'datetime', 'calendar', 'copy', 'pickle', 'struct', 'binascii', 'codecs'
                    }:
                        if module not in pre_installed:
                            required_packages.add(module)
    
    # Check for usage patterns that need additional packages
    for pattern, package in usage_patterns.items():
        if re.search(pattern, code, re.IGNORECASE) and package not in pre_installed:
            required_packages.add(package)
    
    # Special case: if pandas is imported and Excel operations detected
    if 'pandas' in code and any(pattern in code for pattern in ['.to_excel', '.read_excel', 'ExcelWriter']):
        if 'openpyxl' not in pre_installed:
            required_packages.add('openpyxl')
    
    # Remove pre-installed packages
    required_packages = required_packages - pre_installed
    
    return list(required_packages)

def install_package(package_name):
    """Install a package using pip if it's not already installed."""
    try:
        # Special handling for some packages
        import_name = package_name
        if package_name == 'opencv-python':
            import_name = 'cv2'
        elif package_name == 'scikit-learn':
            import_name = 'sklearn'
        elif package_name == 'pillow' or package_name == 'Pillow':
            import_name = 'PIL'
        elif package_name == 'beautifulsoup4':
            import_name = 'bs4'
        elif package_name == 'psycopg2-binary':
            import_name = 'psycopg2'
        else:
            import_name = package_name.replace('-', '_')
            
        spec = importlib.util.find_spec(import_name)
        if spec is None:
            print(f"Installing package: {package_name}")
            result = subprocess.run([
                sys.executable, "-m", "pip", "install", "--quiet", "--no-cache-dir", package_name
            ], capture_output=True, text=True)
            
            if result.returncode == 0:
                print(f"✅ {package_name} installed successfully.")
                return True
            else:
                print(f"❌ Failed to install {package_name}: {result.stderr}")
                return False
        else:
            print(f"✅ {package_name} already installed.")
            return True
    except Exception as e:
        print(f"❌ Error checking/installing {package_name}: {str(e)}")
        return False

def install_packages_if_needed(packages):
    """Install required packages."""
    if not packages:
        print("No additional packages to install.")
        return True
    
    success_count = 0
    failed_packages = []
    
    for package in packages:
        if package:
            if install_package(package):
                success_count += 1
            else:
                failed_packages.append(package)
    
    print(f"✅ Installed/checked {success_count}/{len(packages)} packages.")
    
    if failed_packages:
        print(f"⚠️ Failed to install: {', '.join(failed_packages)}")
    
    return len(failed_packages) == 0

def download_file_from_url(url: str, temp_dir: str) -> Optional[str]:
    """Download a file from URL to temp_dir and return local path."""
    try:
        filename = url.split('/')[-1].split('?')[0] or 'downloaded_file'
        if '.' not in filename:
            filename += '.txt'  # Default extension
        local_path = os.path.join(temp_dir, filename)
        
        response = requests.get(url, stream=True, timeout=30)
        response.raise_for_status()
        
        with open(local_path, 'wb') as f:
            for chunk in response.iter_content(chunk_size=8192):
                f.write(chunk)
        
        print(f"Downloaded {url} to {local_path}")
        return local_path
    except Exception as e:
        print(f"Failed to download {url}: {e}")
        return None

def generate_code_with_openrouter(instruction, file_paths, previous_errors=None, attempt=1):
    """Generate Python code using OpenRouter API with error awareness."""
    
    error_context = ""
    if previous_errors:
        error_context = "\n\nPREVIOUS ERRORS TO AVOID:\n"
        for err in previous_errors:
            error_context += f"- Error type: {err.get('error_type', 'unknown')}\n"
            error_context += f"  Details: {err.get('original_error', '')[:200]}\n"
            error_context += f"  Suggestions: {', '.join(err.get('suggestions', []))}\n"
    
    alternative_approaches = ""
    if attempt > 1:
        alternative_approaches = f"\n\nThis is attempt {attempt}. Please use a different approach:"
        if attempt == 2:
            alternative_approaches += "\n- Use simpler libraries if possible"
            alternative_approaches += "\n- Add more error handling"
            alternative_approaches += "\n- Check file paths carefully"
        elif attempt >= 3:
            alternative_approaches += "\n- Use only standard library if possible"
            alternative_approaches += "\n- Implement fallback solutions"
            alternative_approaches += "\n- Generate mock data if files are problematic"
    
    prompt_template = textwrap.dedent("""
You are a Python expert. Instruction: "{instruction}"
Input files: {file_paths_str} (use file_paths[0] for first file, iterate for multiple; if empty, generate based on instruction alone).
{error_context}
{alternative_approaches}

Write a complete Python script that:
1. Import all necessary libraries at the top.
2. Add "# pip install package_name" comments after imports for all needed libraries.
3. Define file_paths = {file_paths_list}
4. Add comprehensive error handling with try-except blocks
5. Create output directory if needed using os.makedirs(exist_ok=True)
6. Save output to a temp directory using tempfile.mkdtemp()
7. Print "OUTPUT_FILE_PATH: /full/path/to/output" at the end using os.path.abspath()
8. If file operations fail, try alternative approaches

Important rules:
- For pandas Excel operations, always add: # pip install openpyxl
- Always use absolute paths with os.path.abspath()
- Create directories before saving files
- Handle common errors (FileNotFoundError, PermissionError, etc.)
- If a library fails, try alternatives (e.g., csv instead of pandas)
- No __name__ == '__main__', no functions, just direct code
- Add detailed error messages

Example with error handling:
import os
import tempfile
try:
    import pandas as pd
    # pip install pandas openpyxl
except ImportError:
    print("Pandas not available, using csv module")
    import csv

file_paths = {file_paths_list}

try:
    temp_dir = tempfile.mkdtemp()
    os.makedirs(temp_dir, exist_ok=True)
    output_path = os.path.join(temp_dir, 'output.xlsx')
    
    # Your main logic here with error handling
    
    print(f"OUTPUT_FILE_PATH: {{os.path.abspath(output_path)}}")
except Exception as e:
    print(f"ERROR: {{e}}")
    # Fallback solution
    try:
        # Alternative approach
        pass
    except:
        print("All approaches failed")

Output ONLY Python code, no markdown.
    """)
    
    file_paths_list = str(file_paths)
    file_paths_str = ', '.join([os.path.basename(p) if p else 'None' for p in file_paths]) if file_paths else 'None (generate from scratch)'
    
    prompt = prompt_template.format(
        instruction=instruction or "No instruction provided",
        file_paths_str=file_paths_str,
        file_paths_list=file_paths_list,
        error_context=error_context,
        alternative_approaches=alternative_approaches
    )
    
    try:
        response = client.chat.completions.create(
            model=MODEL_NAME,
            messages=[
                {"role": "system", "content": "Output only clean executable Python code with comprehensive error handling."},
                {"role": "user", "content": prompt}
            ],
            max_tokens=4000,
            temperature=0.1 if attempt == 1 else 0.3  # Increase creativity on retries
        )
        
        generated_code = response.choices[0].message.content.strip()
        
        # Clean code blocks
        generated_code = re.sub(r'^```python\s*|\s*```$', '', generated_code, flags=re.MULTILINE).strip()
        
        return generated_code if generated_code else "import sys\nprint('OUTPUT_TEXT: No code generated')\nsys.exit(0)"
        
    except Exception as api_error:
        error_msg = f"API Error: {api_error}"
        print(error_msg)
        # Return simple fallback
        return """import sys
print("OUTPUT_TEXT: Code generation failed due to API error")
sys.exit(0)"""

def execute_code_with_retry(code: str, max_attempts: int = 3) -> Tuple[bool, str, Optional[str]]:
    """Execute code with retry logic and error recovery"""
    tf_path = None
    attempt = 0
    
    while attempt < max_attempts:
        attempt += 1
        print(f"\n=== Execution attempt {attempt}/{max_attempts} ===")
        
        try:
            # Step 1: Detect and install packages
            print("Detecting packages...")
            required_packages = detect_required_packages(code)
            print("Detected packages:", required_packages)
            install_packages_if_needed(required_packages)
            
            # Step 2: Wrap code
            indented = indent_code(code)
            wrapped_code = f"try:\n{indented}\nexcept Exception as e:\n    print(f'ERROR: {{e}}')\n    import traceback; traceback.print_exc()\n    import sys; sys.exit(1)"
            
            # Step 3: Compile check
            print("Compiling code...")
            try:
                compile(wrapped_code, '<string>', 'exec')
                print("Compile OK.")
            except SyntaxError as se:
                error_msg = f"Syntax Error: {se}"
                if attempt < max_attempts:
                    print(f"Syntax error on attempt {attempt}, will regenerate code")
                    return False, error_msg, None
                else:
                    return False, error_msg, None
            
            # Step 4: Create temp file
            print("Creating temp file...")
            with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as tf:
                tf.write(wrapped_code)
                tf_path = tf.name
            print(f"Temp file: {tf_path}")
            
            # Step 5: Execute
            print(f"Executing...")
            result = subprocess.run(
                [sys.executable, tf_path],
                capture_output=True,
                text=True,
                timeout=60
            )
            stdout, stderr = result.stdout, result.stderr
            rc = result.returncode
            
            # Clean up temp file
            if tf_path and os.path.exists(tf_path):
                try:
                    os.unlink(tf_path)
                except:
                    pass
            
            if rc != 0:
                error_msg = f"Execution failed (RC {rc}):\nStderr: {stderr}"
                print(error_msg)
                
                # Check if we should retry
                if attempt < max_attempts:
                    # Analyze error for next attempt
                    error_analysis = ErrorAnalyzer.analyze_error(stderr, code)
                    
                    # Try to fix by installing missing packages
                    if error_analysis['packages']:
                        print(f"Attempting to install missing packages: {error_analysis['packages']}")
                        for pkg in error_analysis['packages']:
                            install_package(pkg)
                    
                    return False, stderr, None
                else:
                    return False, error_msg, None
            
            # Extract output
            output_path_match = re.search(r'OUTPUT_FILE_PATH:\s*(.+)', stdout, re.I)
            output_text_match = re.search(r'OUTPUT_TEXT:\s*(.+)', stdout, re.I | re.DOTALL)
            
            if output_path_match:
                output_path = output_path_match.group(1).strip()
                if os.path.exists(output_path):
                    return True, stdout, output_path
                else:
                    error_msg = f"Output path not found: {output_path}"
                    if attempt < max_attempts:
                        print(error_msg)
                        return False, error_msg, None
                    else:
                        return False, error_msg, None
            elif output_text_match:
                return True, output_text_match.group(1).strip(), None
            else:
                if stdout.strip():
                    return True, stdout, None
                else:
                    return False, "No output generated", None
                    
        except subprocess.TimeoutExpired:
            error_msg = "Timeout: Code execution took too long"
            if attempt < max_attempts:
                print(error_msg)
                return False, error_msg, None
            else:
                return False, error_msg, None
        except Exception as e:
            error_msg = f"Execution error: {str(e)}"
            if attempt < max_attempts:
                print(error_msg)
                return False, error_msg, None
            else:
                return False, error_msg, None
    
    return False, "Max attempts reached", None

def process_request(instruction, files, urls_input):
    """Main processing function with self-correction, supporting URLs."""
    try:
        if not instruction.strip():
            return "لطفاً دستور را وارد کنید. (فایل‌ها و لینک‌ها اختیاری هستند)", None
        
        file_paths = []
        
        # Handle uploaded files
        if files:
            file_paths = [f.name for f in files]
        
        # Handle URLs: download to temp dir
        if urls_input and urls_input.strip():
            temp_dir_for_downloads = tempfile.mkdtemp(prefix='url_downloads_')
            urls = [url.strip() for url in urls_input.split(',') if url.strip()]
            downloaded_paths = []
            for url in urls:
                local_path = download_file_from_url(url, temp_dir_for_downloads)
                if local_path:
                    downloaded_paths.append(local_path)
            file_paths.extend(downloaded_paths)
            print(f"Downloaded {len(downloaded_paths)} files from URLs")
        
        # Clean up note: Temp dirs will be cleaned on shutdown or manually if needed
        
        # Track errors for learning
        previous_errors = []
        generated_codes = []
        
        # Main retry loop
        for attempt in range(1, 4):  # 3 attempts
            print(f"\n{'='*50}")
            print(f"MAIN ATTEMPT {attempt}/3")
            print(f"{'='*50}")
            
            # Generate code
            print("Generating code...")
            generated_code = generate_code_with_openrouter(
                instruction, 
                file_paths, 
                previous_errors=previous_errors if attempt > 1 else None,
                attempt=attempt
            )
            
            if len(generated_code) < 20:
                return f"کد ضعیف تولید شد: {generated_code}", None
            
            generated_codes.append(generated_code)
            print(f"Generated code preview: {generated_code[:200]}...")
            
            # Try to execute
            success, output, file_path = execute_code_with_retry(generated_code, max_attempts=2)
            
            if success:
                # Success!
                result_text = f"✅ Success on attempt {attempt}!\n\n"
                result_text += f"Generated Code:\n```python\n{generated_code}\n```\n\n"
                result_text += f"Output:\n{output}"
                return result_text, file_path
            else:
                # Analyze error
                print(f"\n❌ Attempt {attempt} failed")
                error_analysis = ErrorAnalyzer.analyze_error(output, generated_code)
                previous_errors.append(error_analysis)
                
                print(f"Error type: {error_analysis['error_type']}")
                print(f"Suggestions: {', '.join(error_analysis['suggestions'])}")
                
                # If this was the last attempt
                if attempt == 3:
                    error_report = f"❌ Failed after {attempt} attempts.\n\n"
                    error_report += "Error History:\n"
                    for i, err in enumerate(previous_errors, 1):
                        error_report += f"\nAttempt {i}:\n"
                        error_report += f"- Error type: {err['error_type']}\n"
                        error_report += f"- Details: {err['original_error'][:200]}...\n"
                    
                    error_report += f"\n\nLast generated code:\n```python\n{generated_code}\n```"
                    return error_report, None
        
        return "Unexpected end of retry loop", None
        
    except Exception as e:
        error_msg = f"General error: {type(e).__name__}: {e}\nFull traceback: {traceback.format_exc()}"
        print(error_msg)
        return error_msg, None

# Streamlit Interface
def main():
    st.set_page_config(page_title="AI File Processor - Self Correcting", page_icon="🤖", layout="wide")
    
    st.title("🤖 AI File Processor - Self Correcting Edition")
    st.markdown("""
    این سیستم می‌تواند:
    - کد Python تولید کند
    - خطاها را تشخیص و تحلیل کند
    - به طور خودکار مشکلات را برطرف کند
    - تا 3 بار با رویکردهای مختلف تلاش کند
    
    **مثال دستورات:**
    - "یک فایل اکسل با 1000 نام و شماره تلفن ایرانی بساز"
    - "پس‌زمینه این تصویر را حذف کن"
    - "این فایل CSV را به JSON تبدیل کن"
    
    **نکته:** می‌توانید فایل‌ها را آپلود کنید یا لینک‌های فایل را (جدا شده با کاما) وارد کنید.
    """)
    
    # Inputs
    instruction = st.text_area(
        "دستور", 
        height=100,
        placeholder="مثال: یک نمودار دایره‌ای از داده‌های فروش بکش"
    )
    
    col1, col2 = st.columns(2)
    
    with col1:
        uploaded_files = st.file_uploader(
            "فایل‌های آپلود شده (اختیاری)", 
            accept_multiple_files=True
        )
    
    with col2:
        urls_input = st.text_input(
            "لینک فایل‌ها (جدا با کاما، اختیاری)", 
            placeholder="https://example.com/file1.csv, https://example.com/file2.jpg",
            help="لینک‌ها دانلود خواهند شد و حجم فایل چک نمی‌شود."
        )
    
    # Process button
    if st.button("🚀 اجرا", type="primary"):
        if not instruction.strip():
            st.error("لطفاً دستور را وارد کنید.")
        else:
            with st.spinner("در حال پردازش..."):
                # Convert uploaded files to file-like objects
                files = []
                if uploaded_files:
                    for uploaded_file in uploaded_files:
                        # Save uploaded file to temp location
                        temp_dir = tempfile.mkdtemp()
                        file_path = os.path.join(temp_dir, uploaded_file.name)
                        with open(file_path, "wb") as f:
                            f.write(uploaded_file.getbuffer())
                        files.append(type('FileObj', (), {'name': file_path})())
                
                # Process request
                result_text, output_file = process_request(instruction, files, urls_input)
                
                # Display results
                st.subheader("نتایج")
                st.text_area("خروجی", result_text, height=300)
                
                # Download button for output file
                if output_file and os.path.exists(output_file):
                    with open(output_file, "rb") as f:
                        st.download_button(
                            label="📥 دانلود فایل خروجی",
                            data=f,
                            file_name=os.path.basename(output_file),
                            mime="application/octet-stream"
                        )
    
    # Examples
    st.subheader("مثال‌ها")
    examples = [
        ["یک فایل اکسل با 100 محصول فروشگاهی شامل نام، قیمت و موجودی بساز", None, None],
        ["یک نمودار میله‌ای از داده‌های تصادفی رسم کن", None, None],
        ["یک تصویر 500x500 پیکسل با رنگ‌های تصادفی بساز", None, None],
        ["این فایل را به فرمت JSON تبدیل کن", None, "https://example.com/sample.csv"],
    ]
    
    for i, example in enumerate(examples):
        if st.button(f"مثال {i+1}: {example[0][:30]}..."):
            st.experimental_set_query_params(
                instruction=example[0],
                urls=example[2] if example[2] else ""
            )
            st.experimental_rerun()

if __name__ == "__main__":
    main()