"""
Project:    PARTS Website
Author:     Edward Middleton-Smith
            Precision And Research Technology Systems Limited

Technology: App Routing
Feature:    Core Routes

Description:
Initializes the Flask application, sets the configuration based on the environment, and defines two routes (/ and /about) that render templates with the specified titles.
"""

# IMPORTS
# internal
from datastores.datastore_base import DataStore_Base
from forms.contact import Form_Contact
from helpers.helper_app import Helper_App
from models.model_view_contact import Model_View_Contact
from models.model_view_home import Model_View_Home
import lib.argument_validation as av
# external
from flask import Flask, render_template, jsonify, request,  render_template_string, send_from_directory, redirect, url_for, session, Blueprint, current_app, flash
from flask_mail import Mail, Message
from extensions import db, oauth, mail
from urllib.parse import quote_plus, urlencode
from authlib.integrations.flask_client import OAuth
from authlib.integrations.base_client import OAuthError
from urllib.parse import quote, urlparse, parse_qs
import json
import base64
import hmac
import hashlib
import datetime
from altcha import ChallengeOptions, create_challenge, verify_solution

routes_core = Blueprint('routes_core', __name__)


@routes_core.route(Model_View_Home.HASH_PAGE_HOME, methods=['GET'])
def home():
    try:
        model = Model_View_Home()
        html_body = render_template('pages/core/_home.html', model = model)
    except Exception as e:
        return jsonify(error=str(e)), 403
    return html_body
    
@routes_core.route(Model_View_Contact.HASH_PAGE_CONTACT, methods=['GET'])
def contact():
    try:
        form = Form_Contact()
        model = Model_View_Contact(form)
        html_body = render_template('pages/core/_contact.html', model = model)
    except Exception as e:
        return jsonify(error=str(e)), 403
    return html_body

@routes_core.route(Model_View_Contact.HASH_PAGE_CONTACT, methods=['POST'])
def contact_post():
    try:
        form = Form_Contact()
        Helper_App.console_log(f"Form submitted: {request.form}")
        Helper_App.console_log(f"ALTCHA data in request: {request.form.get('altcha')}")
        if form.validate_on_submit():
            try:
                email = form.email.data
                # CC = form.CC.data # not in use
                contact_name = form.contact_name.data
                company_name = form.company_name.data
                message = form.message.data
                receive_marketing = form.receive_marketing.data
                receive_marketing_text = "I would like to receive marketing emails." if receive_marketing else ""
                # send email
                mailItem = Message("PARTS Website Contact Us Message", recipients=[current_app.config['MAIL_CONTACT_PUBLIC']])
                mailItem.body = f"Dear Lord Edward Middleton-Smith,\n\n{message}\n{receive_marketing_text}\nKind regards,\n{contact_name}\n{company_name}\n{email}"
                mail.send(mailItem)
                flash('Thank you for your message. We will get back to you soon!', 'success')
                return "Submitted."
            except Exception as e:
                return f"Error: {e}"
        print(f"Form validation errors: {form.errors}")
        return "Invalid. Failed to submit."
        # html_body = render_template('pages/core/_contact.html', model = model)
    except Exception as e:
        return jsonify(error=str(e)), 403

@routes_core.route(Model_View_Contact.HASH_ALTCHA_CREATE_CHALLENGE, methods=['GET'])
def create_altcha_challenge():
    options = ChallengeOptions(
        expires = datetime.datetime.now() + datetime.timedelta(hours=1),
        max_number = 100000, # The maximum random number
        hmac_key = current_app.config["ALTCHA_SECRET_KEY"],
    )
    challenge = create_challenge(options)
    print("Challenge created:", challenge)
    # return jsonify({"challenge": challenge})
    return jsonify({
        "algorithm": challenge.algorithm,
        "challenge": challenge.challenge,
        "salt": challenge.salt,
        "signature": challenge.signature,
    })

"""
def verify_altcha_signature(payload):
    "" "Verify the ALTCHA signature"" "
    if 'algorithm' not in payload or 'signature' not in payload or 'verificationData' not in payload:
        return False
    
    algorithm = payload['algorithm']
    signature = payload['signature']
    verification_data = payload['verificationData']
    
    # Calculate SHA hash of the verification data
    if algorithm == 'SHA-256':
        hash_func = hashlib.sha256
    else:
        # Fallback to SHA-256 if algorithm not specified
        hash_func = hashlib.sha256
    
    # Calculate the hash of verification_data
    data_hash = hash_func(verification_data.encode('utf-8')).digest()
    
    # Calculate the HMAC signature
    calculated_signature = hmac.new(
        current_app.config["ALTCHA_SECRET_KEY"].encode('utf-8'),
        data_hash,
        hash_func
    ).hexdigest()
    
    # Compare the calculated signature with the provided signature
    return hmac.compare_digest(calculated_signature, signature)



def create_altcha_dummy_signature(challenge):
    # Example payload to verify
    payload = {
        "algorithm": challenge.algorithm,
        "challenge": challenge.challenge,
        "number": 12345,  # Example number
        "salt": challenge.salt,
        "signature": challenge.signature,
    }
    return payload

@routes_core.route(Model_View_Contact.HASH_ALTCHA_VERIFY_SOLUTION, methods=['POST'])
def verify_altcha_challenge():
    payload = request.json

    ok, err = verify_solution(payload, current_app.config["ALTCHA_SECRET_KEY"], check_expires=True)
    if err:
        return jsonify({"error": err}), 400
    elif ok:
        return jsonify({"verified": True})
    else:
        return jsonify({"verified": False}), 403
"""