# ==============================================================================
# Formeleon - Multi-tenant Form Generator
# Author: Björn Runden <br@runden.net>
# Module: routes/api.py
# Description: Public API Blueprint for handling form handshakes and submissions.
# ==============================================================================

import logging
from flask import Blueprint, request, jsonify, current_app
from models import db, Tenant, FormConfig, Submission, SubmissionStatus
from services.mailer import MailerService
from services.recaptcha import get_recaptcha_service
import uuid

logger = logging.getLogger(__name__)

# Create public API blueprint
api_bp = Blueprint('api', __name__, url_prefix='/api/v1')


def _get_tenant_from_auth():
    """Helper to validate Bearer token and return Tenant."""
    auth_header = request.headers.get('Authorization', '')
    if not auth_header.startswith('Bearer '):
        return None
    
    public_key = auth_header.replace('Bearer ', '').strip()
    tenant = Tenant.query.filter_by(public_key=public_key).first()
    return tenant


@api_bp.route('/forms/<form_id>', methods=['GET'])
def get_form_config(form_id):
    """
    Handshake Endpoint.
    Client snippet requests form configuration using its public key.
    """
    tenant = _get_tenant_from_auth()
    if not tenant:
        return jsonify({'error': 'Unauthorized. Invalid public key.'}), 401

    if not tenant.is_active():
        return jsonify({'error': 'Tenant is inactive.'}), 403
        
    # Check origin (CORS / allowed domains)
    origin = request.headers.get('Origin')
    if origin and not tenant.is_origin_allowed(origin):
        logger.warning(f"Origin rejected: {origin} for tenant {tenant.id}")
        return jsonify({'error': 'Origin not allowed'}), 403

    form = FormConfig.query.filter_by(id=form_id, tenant_id=tenant.id).first()
    if not form:
        return jsonify({'error': 'Form not found or access denied.'}), 404

    if not form.is_active:
        return jsonify({'error': 'Form is inactive.'}), 403

    recaptcha_service = get_recaptcha_service()

    return jsonify({
        'id': form.id,
        'name': form.name,
        'description': form.description,
        'form_structure': form.form_structure,
        'recaptcha': {
            'enabled': recaptcha_service.is_enabled() and not recaptcha_service.is_dev_mode(),
            'site_key': recaptcha_service.get_site_key()
        }
    }), 200


@api_bp.route('/submissions', methods=['POST'])
def submit_form():
    """
    Submission Endpoint.
    Receives JSON payload, validates reCAPTCHA (mocked in dev), and saves to DB.
    """
    tenant = _get_tenant_from_auth()
    if not tenant:
        return jsonify({'error': 'Unauthorized. Invalid public key.'}), 401

    data = request.get_json()
    if not data:
        return jsonify({'error': 'Invalid JSON payload.'}), 400

    form_id = data.get('form_id')
    payload = data.get('payload')
    recaptcha_token = data.get('recaptcha_token')

    if not form_id or not payload:
        return jsonify({'error': 'Missing form_id or payload.'}), 400

    form = FormConfig.query.filter_by(id=form_id, tenant_id=tenant.id).first()
    if not form:
        return jsonify({'error': 'Form not found.'}), 404

    # --- reCAPTCHA Validation ---
    recaptcha_service = get_recaptcha_service()
    
    # Get client IP for additional reCAPTCHA validation
    client_ip = request.headers.get('X-Forwarded-For', request.remote_addr)
    if client_ip and ',' in client_ip:
        client_ip = client_ip.split(',')[0].strip()
        
    recaptcha_passed, recaptcha_score = recaptcha_service.verify(recaptcha_token, client_ip)
    
    status = SubmissionStatus.PENDING if recaptcha_passed else SubmissionStatus.SPAM

    # Save Submission
    sub_id = f"sub_{uuid.uuid4().hex[:12]}"
    new_submission = Submission(
        id=sub_id,
        form_config_id=form.id,
        tenant_id=tenant.id,
        payload=payload,
        recaptcha_score=recaptcha_score,
        recaptcha_passed=recaptcha_passed,
        status=status,
        user_agent=request.headers.get('User-Agent'),
        referer=request.headers.get('Referer')
    )

    db.session.add(new_submission)
    db.session.commit()

    # --- Trigger Email Notifications (if not spam) ---
    if recaptcha_passed:
        # Check Tenant Level Permissions
        allow_instant_mail = tenant.config.get('features', {}).get('instant_notifications', True) # Default to true for now
        allow_autoresponder = tenant.config.get('features', {}).get('submitter_autoresponder', True)

        if form.settings:
            # 1. Admin Notification
            notif_settings = form.settings.get('notifications', {})
            if allow_instant_mail and notif_settings.get('enabled'):
                send_to = notif_settings.get('send_to', [])
                if send_to:
                    # In a production app, you might want to queue this with Celery instead of blocking the request
                    try:
                        MailerService.send_admin_notification(form.name, send_to, payload)
                    except Exception as e:
                        logger.error(f"Failed to send admin notification: {e}")

            # 2. Submitter Autoresponder
            auto_settings = form.settings.get('autoresponder', {})
            if allow_autoresponder and auto_settings.get('enabled'):
                target_field = auto_settings.get('email_field_name')
                target_email = payload.get(target_field) if target_field else None
                
                if target_email and '@' in str(target_email):
                    try:
                        MailerService.send_autoresponder(
                            to_address=str(target_email),
                            subject_template=auto_settings.get('subject', 'Thank you!'),
                            body_template=auto_settings.get('body_template', ''),
                            payload=payload
                        )
                    except Exception as e:
                        logger.error(f"Failed to send autoresponder to {target_email}: {e}")

    if not recaptcha_passed:
        return jsonify({'error': 'Spam detected. Submission rejected.'}), 400

    return jsonify({
        'message': 'Submission received successfully',
        'submission_id': sub_id
    }), 201