from flask import Blueprint, request, jsonify, current_app
from flask_jwt_extended import jwt_required, get_jwt_identity
from services.linkedin_service import LinkedInService
import secrets

accounts_bp = Blueprint('accounts', __name__)

@accounts_bp.route('/', methods=['OPTIONS'])
@accounts_bp.route('', methods=['OPTIONS'])
def handle_options():
    """Handle OPTIONS requests for preflight CORS checks."""
    return '', 200

@accounts_bp.route('/', methods=['GET'])
@accounts_bp.route('', methods=['GET'])
@jwt_required()
def get_accounts():
    """
    Get all social media accounts for the current user.
    
    Returns:
        JSON: List of social media accounts
    """
    try:
        user_id = get_jwt_identity()
        
        # Check if Supabase client is initialized
        if not hasattr(current_app, 'supabase') or current_app.supabase is None:
            # Add CORS headers to error response
            response_data = jsonify({
                'success': False,
                'message': 'Database connection not initialized'
            })
            response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
            response_data.headers.add('Access-Control-Allow-Credentials', 'true')
            return response_data, 500
        
        # Fetch accounts from Supabase
        response = (
            current_app.supabase
            .table("Social_network")
            .select("*")
            .eq("id_utilisateur", user_id)
            .execute()
        )
        
        accounts = response.data if response.data else []
        
        # Add CORS headers explicitly
        response_data = jsonify({
            'success': True,
            'accounts': accounts
        })
        response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
        response_data.headers.add('Access-Control-Allow-Credentials', 'true')
        return response_data, 200
        
    except Exception as e:
        current_app.logger.error(f"Get accounts error: {str(e)}")
        # Add CORS headers to error response
        response_data = jsonify({
            'success': False,
            'message': 'An error occurred while fetching accounts'
        })
        response_data.headers.add('Access-Control-Allow-Origin', 'http://localhost:3000')
        response_data.headers.add('Access-Control-Allow-Credentials', 'true')
        return response_data, 500

@accounts_bp.route('/', methods=['POST'])
@accounts_bp.route('', methods=['POST'])
@jwt_required()
def add_account():
    """
    Add a new social media account for the current user.
    
    Request Body:
        account_name (str): Account name
        social_network (str): Social network name
        
    Returns:
        JSON: Add account result
    """
    try:
        user_id = get_jwt_identity()
        data = request.get_json()
        
        # Validate required fields
        if not data or not all(k in data for k in ('account_name', 'social_network')):
            return jsonify({
                'success': False,
                'message': 'Account name and social network are required'
            }), 400
        
        account_name = data['account_name']
        social_network = data['social_network']
        
        # For LinkedIn, initiate OAuth flow
        if social_network.lower() == 'linkedin':
            linkedin_service = LinkedInService()
            # Generate a random state for security
            state = secrets.token_urlsafe(32)
            
            # Store state in session or database for verification later
            # For now, we'll return it to the frontend
            authorization_url = linkedin_service.get_authorization_url(state)
            
            return jsonify({
                'success': True,
                'message': 'Please authenticate with LinkedIn',
                'authorization_url': authorization_url,
                'state': state
            }), 200
        else:
            return jsonify({
                'success': False,
                'message': 'Unsupported social network'
            }), 400
        
    except Exception as e:
        current_app.logger.error(f"Add account error: {str(e)}")
        return jsonify({
            'success': False,
            'message': f'An error occurred while adding account: {str(e)}'
        }), 500

@accounts_bp.route('/callback', methods=['POST'])
@jwt_required()
def handle_oauth_callback():
    """
    Handle OAuth callback from social network.
    
    Request Body:
        code (str): Authorization code
        state (str): State parameter
        social_network (str): Social network name
        
    Returns:
        JSON: OAuth callback result
    """
    try:
        user_id = get_jwt_identity()
        data = request.get_json()
        
        # Validate required fields
        if not data or not all(k in data for k in ('code', 'state', 'social_network')):
            return jsonify({
                'success': False,
                'message': 'Code, state, and social network are required'
            }), 400
        
        code = data['code']
        state = data['state']
        social_network = data['social_network']
        
        # Verify state (in a real implementation, you would check against stored state)
        # For now, we'll skip this verification
        
        if social_network.lower() == 'linkedin':
            linkedin_service = LinkedInService()
            
            # Exchange code for access token
            token_response = linkedin_service.get_access_token(code)
            access_token = token_response['access_token']
            
            # Get user info
            user_info = linkedin_service.get_user_info(access_token)
            
            # Store account info in Supabase
            response = (
                current_app.supabase
                .table("Social_network")
                .insert({
                    "social_network": social_network,
                    "account_name": user_info.get('name', 'LinkedIn Account'),
                    "id_utilisateur": user_id,
                    "token": access_token,
                    "sub": user_info.get('sub'),
                    "given_name": user_info.get('given_name'),
                    "family_name": user_info.get('family_name'),
                    "picture": user_info.get('picture')
                })
                .execute()
            )
            
            if response.data:
                return jsonify({
                    'success': True,
                    'message': 'Account linked successfully',
                    'account': response.data[0]
                }), 200
            else:
                return jsonify({
                    'success': False,
                    'message': 'Failed to link account'
                }), 500
        else:
            return jsonify({
                'success': False,
                'message': 'Unsupported social network'
            }), 400
        
    except Exception as e:
        current_app.logger.error(f"OAuth callback error: {str(e)}")
        return jsonify({
            'success': False,
            'message': f'An error occurred during OAuth callback: {str(e)}'
        }), 500

@accounts_bp.route('/<account_id>', methods=['OPTIONS'])
def handle_account_options(account_id):
    """Handle OPTIONS requests for preflight CORS checks for specific account."""
    return '', 200

@accounts_bp.route('/<account_id>', methods=['DELETE'])
@jwt_required()
def delete_account(account_id):
    """
    Delete a social media account.
    
    Path Parameters:
        account_id (str): Account ID
        
    Returns:
        JSON: Delete account result
    """
    try:
        user_id = get_jwt_identity()
        
        # Delete account from Supabase
        response = (
            current_app.supabase
            .table("Social_network")
            .delete()
            .eq("id", account_id)
            .eq("id_utilisateur", user_id)
            .execute()
        )
        
        if response.data:
            return jsonify({
                'success': True,
                'message': 'Account deleted successfully'
            }), 200
        else:
            return jsonify({
                'success': False,
                'message': 'Account not found or unauthorized'
            }), 404
        
    except Exception as e:
        current_app.logger.error(f"Delete account error: {str(e)}")
        return jsonify({
            'success': False,
            'message': 'An error occurred while deleting account'
        }), 500

@accounts_bp.route('/<account_id>/primary', methods=['OPTIONS'])
def handle_primary_options(account_id):
    """Handle OPTIONS requests for preflight CORS checks for primary account."""
    return '', 200

@accounts_bp.route('/<account_id>/primary', methods=['PUT'])
@jwt_required()
def set_primary_account(account_id):
    """
    Set an account as primary for the user.
    
    Path Parameters:
        account_id (str): Account ID
        
    Returns:
        JSON: Update result
    """
    try:
        user_id = get_jwt_identity()
        
        # First, get all accounts for this user
        response = (
            current_app.supabase
            .table("Social_network")
            .select("*")
            .eq("id_utilisateur", user_id)
            .execute()
        )
        
        accounts = response.data if response.data else []
        
        # Check if account exists and belongs to user
        account_exists = any(account['id'] == account_id and account['id_utilisateur'] == user_id for account in accounts)
        
        if not account_exists:
            return jsonify({
                'success': False,
                'message': 'Account not found or unauthorized'
            }), 404
        
        # For now, we'll just return success
        # In a real implementation, you might want to add a 'is_primary' field
        # and update all accounts accordingly
        
        return jsonify({
            'success': True,
            'message': 'Account set as primary successfully'
        }), 200
        
    except Exception as e:
        current_app.logger.error(f"Set primary account error: {str(e)}")
        return jsonify({
            'success': False,
            'message': 'An error occurred while setting primary account'
        }), 500