from flask import Blueprint, request, jsonify
from app.models import Role, User, db, RoleTemplate, Permission
from sqlalchemy.exc import IntegrityError
from datetime import datetime

bp = Blueprint('roles', __name__)

@bp.route('<int:role_id>/add_user', methods=['POST'])
def add_user_to_role(role_id):
    data = request.get_json()
    
    if not data or 'user_id' not in data:
        return jsonify({'message': '用户ID是必需的'}), 400
    
    user_id = data['user_id']
    
    role = Role.query.get(role_id)
    if not role:
        return jsonify({'message': '角色不存在'}), 404
    
    user = User.query.get(user_id)
    if not user:
        return jsonify({'message': '用户不存在'}), 404
    
    if role not in user.roles:
        user.roles.append(role)
    else:
        return jsonify({'message': '用户已经在该角色中'}), 400
    
    try:
        db.session.commit()
        return jsonify({'message': '用户成功添加到角色'}), 200
    except IntegrityError:
        db.session.rollback()
        return jsonify({'message': '添加用户到角色失败，可能是由于数据完整性问题'}), 500

# 你可以在这里添加更多的角色相关路由...

@bp.route('', methods=['POST'])
def create_role():
    data = request.get_json()
    
    if not data or 'name' not in data:
        return jsonify({'message': '角色名称是必需的'}), 400
    
    name = data['name']
    
    # 检查角色名称是否已存在
    if Role.query.filter_by(name=name).first():
        return jsonify({'message': '角色名称已存在'}), 400
    
    new_role = Role(name=name)
    db.session.add(new_role)
    
    # 如果提供了描述，设置它
    if 'description' in data:
        new_role.set_detail('description', data['description'])
    
    try:
        db.session.commit()
    except IntegrityError:
        db.session.rollback()
        return jsonify({'message': '创建角色失败，可能是由于数据完整性问题'}), 500
    
    return jsonify({'message': '角色创建成功', 'id': new_role.id}), 201

@bp.route('/<int:role_id>', methods=['GET'])
def get_role(role_id):
    role = Role.query.get(role_id)
    if not role:
        return jsonify({'message': '角色不存在'}), 404
    
    return jsonify({
        'id': role.id,
        'name': role.name,
        'description': role.get_detail('description'),
        'users': [user.id for user in role.users],
        'parent_id': role.parent_id
    }), 200

@bp.route('/templates', methods=['POST'])
def create_role_template():
    data = request.get_json()
    if not data or 'name' not in data or 'permissions' not in data:
        return jsonify({'message': '缺少必要的字段'}), 400
    
    template = RoleTemplate.create_template(
        name=data['name'],
        description=data.get('description'),
        permissions=[Permission.query.get(p_id) for p_id in data['permissions']]
    )
    return jsonify({'message': '角色模板创建成功', 'id': template.id}), 201

@bp.route('/from_template', methods=['POST'])
def create_role_from_template():
    data = request.get_json()
    if not data or 'template_id' not in data:
        return jsonify({'message': '缺少必要的字段'}), 400
    
    try:
        role = Role.create_from_template(
            template_id=data['template_id'],
            name=data.get('name')
        )
        return jsonify({'message': '角色创建成功', 'id': role.id}), 201
    except ValueError as e:
        return jsonify({'message': str(e)}), 400

@bp.route('', methods=['GET'])
def get_roles():
    roles = Role.query.all()
    roles_list = [{
        'id': role.id,
        'name': role.name,
        'description': role.get_detail('description'),
        'created_at': role.created_at.isoformat() if role.created_at else None
    } for role in roles]
    return jsonify(roles_list), 200

@bp.route('/<int:role_id>', methods=['GET'])
def get_role_details(role_id):
    role = Role.query.get(role_id)
    if not role:
        return jsonify({'message': '角色不存在'}), 404
    
    permissions = [{'id': p.id, 'name': p.name, 'description': p.get_detail('description')} for p in role.permissions]
    users = [{'id': u.id, 'username': u.username} for u in role.users]
    
    role_details = {
        'id': role.id,
        'name': role.name,
        'description': role.get_detail('description'),
        'created_at': role.created_at.isoformat() if role.created_at else None,
        'permissions': permissions,
        'users': users
    }
    
    return jsonify(role_details), 200