#!/usr/bin/env python3

import os
from dotenv import load_dotenv
from flask import Flask, request, jsonify
import subprocess
import json
from datetime import datetime, timedelta

load_dotenv()  # This will load environment variables from a .env file if it exists

app = Flask(__name__)

def fetch_account_name(account_no):
    try:
        result = subprocess.run(['./fetchname.sh', account_no], capture_output=True, text=True, check=True)
        response = json.loads(result.stdout)
        if response.get('success'):
            return response.get('accountName')
    except (subprocess.CalledProcessError, json.JSONDecodeError) as e:
        app.logger.error(f"Error fetching account name: {str(e)}")
    return None

@app.route('/verify-payment', methods=['POST'])
def verify_payment():
    # Get data from request
    data = request.json
    benef_name = data.get('benefName', '').strip().lower()
    abs_amount = data.get('absAmount')
    time_str = data.get('time')
    account_no = data.get('accountNo')

    # Fetch account name if account number is provided
    if account_no:
        fetched_name = fetch_account_name(account_no)
        if fetched_name:
            benef_name = fetched_name.strip().lower()
        else:
            return jsonify({"success": False, "message": "Failed to fetch account name"}), 400

    # Validate input
    if not all([benef_name, abs_amount, time_str]):
        return jsonify({"success": False, "message": "Missing required parameters"}), 400

    try:
        # Parse the input time
        request_time = datetime.strptime(time_str, "%Y-%m-%d %H:%M")
    except ValueError:
        return jsonify({"success": False, "message": "Invalid time format"}), 400

    # Execute tx.sh and get the output
    try:
        result = subprocess.run(['./tx.sh'], capture_output=True, text=True, check=True)
        tx_response = json.loads(result.stdout)
        
        # Debug: Print the entire tx_response
        app.logger.debug(f"tx_response: {json.dumps(tx_response, indent=2)}")
        
        if not tx_response.get('success'):
            return jsonify({"success": False, "message": f"Error from tx.sh: {tx_response.get('reasonText', 'Unknown error')}"}), 500
        
        tx_data_list = tx_response.get('data', [])
        if not tx_data_list:
            return jsonify({"success": False, "message": "No transaction data found"}), 404
        
    except subprocess.CalledProcessError as e:
        return jsonify({"success": False, "message": f"Error executing tx.sh: {str(e)}", "stderr": e.stderr}), 500
    except json.JSONDecodeError as e:
        return jsonify({"success": False, "message": f"Error parsing tx.sh output: {str(e)}", "output": result.stdout}), 500

    # Check transactions
    for tx_data in tx_data_list:
        # Check if the required keys exist in tx_data
        required_keys = ['trxDate', 'benefName', 'absAmount']
        missing_keys = [key for key in required_keys if key not in tx_data]
        if missing_keys:
            continue  # Skip this transaction if it's missing required keys

        try:
            tx_time = datetime.strptime(tx_data['trxDate'], "%Y-%m-%d %H:%M:%S")
            time_diff = abs(tx_time - request_time)
            
            # Normalize transaction beneficiary name for comparison
            tx_benef_name = tx_data['benefName'].strip().lower()
            
            if (tx_benef_name == benef_name and
                str(tx_data['absAmount']) == str(abs_amount) and
                time_diff <= timedelta(minutes=30)):
                return jsonify({"success": True, "message": "Payment verified"})
        except ValueError as e:
            app.logger.error(f"Error processing transaction: {str(e)}")
            continue  # Skip this transaction if there's an error processing it

    # If we've checked all transactions and found no match
    return jsonify({"success": False, "message": "Transaction not found, contact support"})

if __name__ == '__main__':
    debug_mode = os.getenv('APP_DEBUG', 'False').lower() in ('true', '1', 't')
    port = int(os.getenv('PORT', 5000))
    app.run(host='0.0.0.0', port=port, debug=debug_mode)