# app.py
from flask import Flask, request, render_template, jsonify, send_file
from parser import parse_python_code
import os
import json
import io
from database import init_chromadb, populate_sample_db, store_program, query_programs, load_chromadb_from_hf, HF_DATASET_NAME, HF_TOKEN, DB_NAME

# User-configurable variables
UPLOAD_DIR = "./uploads"  # Directory for uploads

app = Flask(__name__)

def reconstruct_code(parts):
    """Reconstruct the original code from parsed parts."""
    sorted_parts = sorted(parts, key=lambda p: p['location'][0])
    return ''.join(part['source'] for part in sorted_parts)

@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        parts = None
        filename = 'unnamed.py'
        code_input = None
        query_results = None

        # Handle file upload or pasted code (parsing)
        if 'file' in request.files and request.files['file'].filename:
            file = request.files['file']
            if not file.filename.endswith('.py'):
                return 'Invalid file type. Please upload a Python file.', 400
            filename = file.filename
            file_path = os.path.join(UPLOAD_DIR, filename)
            file.save(file_path)
            with open(file_path, 'r') as f:
                code_input = f.read()
            parts, sequence = parse_python_code(code_input)
            # Store in ChromaDB
            client = init_chromadb()
            vectors = [part['vector'] for part in parts]
            store_program(client, code_input, sequence, vectors, DB_NAME)
        elif 'code' in request.form and request.form['code'].strip():
            code_input = request.form['code']
            filename = request.form.get('filename', 'unnamed.py') or 'unnamed.py'
            if not filename.endswith('.py'):
                filename += '.py'
            parts, sequence = parse_python_code(code_input)
            vectors = [part['vector'] for part in parts]
            client = init_chromadb()
            store_program(client, code_input, sequence, vectors, DB_NAME)
        elif 'query_ops' in request.form and request.form['query_ops'].strip():
            # Handle query for operations (category sequence)
            operations = [op.strip() for op in request.form['query_ops'].split(',')]
            client = load_chromadb_from_hf(HF_DATASET_NAME, HF_TOKEN)  # Load from Hugging Face
            query_results = query_programs(client, operations, DB_NAME)
            return render_template(
                'results_partial.html',
                parts=None,
                filename=filename,
                reconstructed_code=None,
                code_input=None,
                query_results=query_results
            )
        elif 'semantic_query' in request.form and request.form['semantic_query'].strip():
            # Handle semantic query (natural language description)
            semantic_query = request.form['semantic_query']
            client = load_chromadb_from_hf(HF_DATASET_NAME, HF_TOKEN)  # Load from Hugging Face
            query_results = query_programs(client, None, DB_NAME, semantic_query=semantic_query)
            return render_template(
                'results_partial.html',
                parts=None,
                filename=filename,
                reconstructed_code=None,
                code_input=None,
                query_results=query_results
            )

        if parts:
            indexed_parts = [{'index': i + 1, **part} for i, part in enumerate(parts)]
            reconstructed_code = reconstruct_code(indexed_parts)
            return render_template(
                'results_partial.html',
                parts=indexed_parts,
                filename=filename,
                reconstructed_code=reconstructed_code,
                code_input=code_input,
                query_results=None
            )
        return 'No file, code, or query provided', 400

    # Initial page load
    client = load_chromadb_from_hf(HF_DATASET_NAME, HF_TOKEN)  # Load from Hugging Face on startup
    # If no dataset exists locally, populate with samples
    try:
        if not client.list_collections()[0].name == DB_NAME:
            populate_sample_db(client)
    except:
        populate_sample_db(client)
    return render_template('index.html', parts=None, filename=None, reconstructed_code=None, code_input=None, query_results=None)

@app.route('/export_json', methods=['POST'])
def export_json():
    parts = request.json.get('parts', [])
    export_data = [{'vector': part['vector'], 'source': part['source'], 'description': generate_description_tokens([part['category']], [part['vector']])}
                   for part in parts]
    json_str = json.dumps(export_data, indent=2)
    buffer = io.BytesIO(json_str.encode('utf-8'))
    buffer.seek(0)
    return send_file(
        buffer,
        as_attachment=True,
        download_name='code_vectors.json',
        mimetype='application/json'
    )

def generate_description_tokens(sequence, vectors):
    """Generate semantic description tokens for a program based on its sequence and vectors."""
    tokens = []
    category_descriptions = {
        'import': 'imports module',
        'function': 'defines function',
        'assigned_variable': 'assigns variable',
        'input_variable': 'input parameter',
        'returned_variable': 'returns value',
        'if': 'conditional statement',
        'return': 'returns result',
        'try': 'try block',
        'except': 'exception handler',
        'expression': 'expression statement',
        'spacer': 'empty line or comment'
    }
    
    for cat, vec in zip(sequence, vectors):
        if cat in category_descriptions:
            tokens.append(f"{category_descriptions[cat]}:{cat}")
            # Add vector-derived features (e.g., level, span) as tokens
            tokens.append(f"level:{vec[1]}")
            tokens.append(f"span:{vec[3]:.2f}")
    return " ".join(tokens)

if __name__ == '__main__':
    if not os.path.exists(UPLOAD_DIR):
        os.makedirs(UPLOAD_DIR)
    app.run(host="0.0.0.0", port=7860)