"""
OAuth API Routes
================

Endpoints for connecting external accounts (Google, Meta) via OAuth 2.0.
"""

import logging
import secrets
from flask import jsonify, request, redirect, session
from flask_login import login_required, current_user

from . import bp
from database import SessionLocal, OAuthToken

logger = logging.getLogger(__name__)


@bp.route('/oauth/connect/<provider>/<service>', methods=['POST'])
@login_required
def oauth_connect(provider, service):
    """Initiate OAuth flow for connecting an external account.

    POST /api/oauth/connect/google/gbp
    POST /api/oauth/connect/meta/facebook
    """
    from oauth_service import OAuthService

    # Validate provider/service
    valid_combinations = {
        ('google', 'gbp'), ('google', 'search_console'),
        ('meta', 'facebook'), ('meta', 'instagram'),
    }
    if (provider, service) not in valid_combinations:
        return jsonify({'success': False, 'error': f'Nieznany provider/service: {provider}/{service}'}), 400

    # User must have a company
    if not current_user.company_id:
        return jsonify({'success': False, 'error': 'Musisz być przypisany do firmy'}), 403

    # Generate CSRF state token
    state = f"{current_user.company_id}:{current_user.id}:{service}:{secrets.token_urlsafe(16)}"
    session['oauth_state'] = state

    oauth = OAuthService()
    auth_url = oauth.get_authorization_url(provider, service, state)

    if not auth_url:
        return jsonify({
            'success': False,
            'error': f'OAuth nie skonfigurowany dla {provider}. Skontaktuj się z administratorem.'
        }), 503

    return jsonify({'success': True, 'auth_url': auth_url})


@bp.route('/oauth/callback/<provider>', methods=['GET'])
@login_required
def oauth_callback(provider):
    """Handle OAuth callback from provider.

    GET /api/oauth/callback/google?code=...&state=...
    GET /api/oauth/callback/meta?code=...&state=...
    """
    from oauth_service import OAuthService

    code = request.args.get('code')
    state = request.args.get('state')
    error = request.args.get('error')

    if error:
        logger.warning(f"OAuth error from {provider}: {error}")
        return redirect(f'/admin/company?oauth_error={error}')

    if not code or not state:
        return redirect('/admin/company?oauth_error=missing_params')

    # Validate state
    saved_state = session.pop('oauth_state', None)
    if not saved_state or saved_state != state:
        logger.warning(f"OAuth state mismatch for {provider}")
        return redirect('/admin/company?oauth_error=invalid_state')

    # Parse state: company_id:user_id:service:random
    try:
        parts = state.split(':')
        company_id = int(parts[0])
        user_id = int(parts[1])
        service = parts[2]
    except (ValueError, IndexError):
        return redirect('/admin/company?oauth_error=invalid_state_format')

    # Verify user owns this company
    if current_user.id != user_id or current_user.company_id != company_id:
        return redirect('/admin/company?oauth_error=unauthorized')

    # Exchange code for token
    oauth = OAuthService()
    token_data = oauth.exchange_code(provider, code)

    if not token_data:
        return redirect('/admin/company?oauth_error=token_exchange_failed')

    # Save token
    db = SessionLocal()
    try:
        success = oauth.save_token(db, company_id, user_id, provider, service, token_data)
        if success:
            logger.info(f"OAuth connected: {provider}/{service} for company {company_id} by user {user_id}")
            return redirect(f'/admin/company?oauth_success={provider}/{service}')
        else:
            return redirect('/admin/company?oauth_error=save_failed')
    finally:
        db.close()


@bp.route('/oauth/status', methods=['GET'])
@login_required
def oauth_status():
    """Get connected OAuth services for current user's company.

    GET /api/oauth/status
    """
    from oauth_service import OAuthService

    if not current_user.company_id:
        return jsonify({'success': True, 'services': {}})

    db = SessionLocal()
    try:
        oauth = OAuthService()
        services = oauth.get_connected_services(db, current_user.company_id)

        # Add available (but not connected) services
        all_services = {
            'google/gbp': {'name': 'Google Business Profile', 'description': 'Pełne dane o wizytówce, opinie, insights'},
            'google/search_console': {'name': 'Google Search Console', 'description': 'Zapytania, CTR, pozycje w wyszukiwaniu'},
            'meta/facebook': {'name': 'Facebook', 'description': 'Reach, impressions, demographics, post insights'},
            'meta/instagram': {'name': 'Instagram', 'description': 'Stories, reels, engagement metrics'},
        }

        result = {}
        for key, info in all_services.items():
            connected = services.get(key, {})
            result[key] = {
                **info,
                'connected': bool(connected),
                'account_name': connected.get('account_name'),
                'expires_at': connected.get('expires_at'),
                'is_expired': connected.get('is_expired', False),
            }

        return jsonify({'success': True, 'services': result})
    finally:
        db.close()


@bp.route('/oauth/disconnect/<provider>/<service>', methods=['POST'])
@login_required
def oauth_disconnect(provider, service):
    """Disconnect an OAuth service.

    POST /api/oauth/disconnect/google/gbp
    """
    if not current_user.company_id:
        return jsonify({'success': False, 'error': 'Brak przypisanej firmy'}), 403

    db = SessionLocal()
    try:
        token = db.query(OAuthToken).filter(
            OAuthToken.company_id == current_user.company_id,
            OAuthToken.provider == provider,
            OAuthToken.service == service,
        ).first()

        if token:
            token.is_active = False
            db.commit()
            logger.info(f"OAuth disconnected: {provider}/{service} for company {current_user.company_id}")
            return jsonify({'success': True, 'message': f'{provider}/{service} rozłączony'})
        else:
            return jsonify({'success': False, 'error': 'Nie znaleziono połączenia'}), 404
    finally:
        db.close()