import os
import zipfile
import shutil
import datetime

from flask import Blueprint, render_template, request, send_file, jsonify, current_app
from .utils.zip_handler import handle_zip_upload
from .utils.vector_db import process_files_to_vectors

v_bp = Blueprint('routes', __name__)

@v_bp.route('/', methods=['GET', 'POST'])
def home():
    if request.method == 'POST':
        # 1. Validate the uploaded file
        v_uploaded_file = request.files.get('file')
        if not v_uploaded_file or not v_uploaded_file.filename.endswith('.zip'):
            return jsonify({'error': 'Please upload a valid zip file (.zip).'}), 400

        # 2. Get the uploads folder from Flask config
        v_uploads_folder = current_app.config['UPLOAD_FOLDER']
        # Example: "app/uploads"

        # 3. Clean up the existing contents in uploads folder
        cleanup_uploads_folder(v_uploads_folder)
        os.makedirs(v_uploads_folder, exist_ok=True)

        # 4. Save the new ZIP file into the uploads folder
        v_upload_path = os.path.join(v_uploads_folder, v_uploaded_file.filename)
        v_uploaded_file.save(v_upload_path)

        # 5. Extract the ZIP file (directly into app/uploads)
        handle_zip_upload(v_upload_path)

        # 6. Process all extracted files to create/update vector DB in app/uploads/vectors
        process_files_to_vectors(v_uploads_folder)

        # 7. Build a timestamped filename for the final zip
        v_timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
        v_zip_filename = f"uploads_all_{v_timestamp}.zip"
        # Final zip will be inside app/uploads
        v_final_zip_path = os.path.join(v_uploads_folder, v_zip_filename)

        # 8. Zip the entire app/uploads folder (skip the final zip to prevent recursion)
        with zipfile.ZipFile(v_final_zip_path, 'w', zipfile.ZIP_DEFLATED) as obj_zip:
            for v_root, _, v_files in os.walk(v_uploads_folder):
                for v_file in v_files:
                    # Exclude the new zip itself from being re-zipped
                    if v_file == v_zip_filename:
                        continue
                    v_full_path = os.path.join(v_root, v_file)
                    v_arcname = os.path.relpath(v_full_path, start=v_uploads_folder)
                    obj_zip.write(v_full_path, arcname=v_arcname)

        # 9. Send the final zip file to the user
        return send_file(v_final_zip_path, as_attachment=True)

    # If GET, render the upload form
    return render_template('index.html')


def cleanup_uploads_folder(v_folder_path):
    """
    Deletes all files/folders inside v_folder_path.
    """
    if os.path.exists(v_folder_path):
        for v_item in os.listdir(v_folder_path):
            v_item_path = os.path.join(v_folder_path, v_item)
            if os.path.isfile(v_item_path):
                os.remove(v_item_path)
            elif os.path.isdir(v_item_path):
                shutil.rmtree(v_item_path)