# -*- coding: utf-8 -*-
"""
租户管理蓝图
处理租户 CRUD 的 API 路由
"""

import json
import logging
from flask import Blueprint, request, jsonify
from src.core.database import db_manager
from src.core.models import Tenant, DEFAULT_TENANT

logger = logging.getLogger(__name__)

tenants_bp = Blueprint('tenants', __name__, url_prefix='/api/tenants')


def _ensure_default_tenant():
    """确保 default 租户存在"""
    try:
        with db_manager.get_session() as session:
            existing = session.query(Tenant).filter(Tenant.tenant_id == DEFAULT_TENANT).first()
            if not existing:
                session.add(Tenant(
                    tenant_id=DEFAULT_TENANT,
                    name="默认租户",
                    description="系统默认租户"
                ))
                session.commit()
    except Exception as e:
        logger.error(f"确保默认租户失败: {e}")


@tenants_bp.route('', methods=['GET'])
def list_tenants():
    """获取所有租户列表"""
    try:
        with db_manager.get_session() as session:
            tenants = session.query(Tenant).order_by(Tenant.created_at).all()
            return jsonify([t.to_dict() for t in tenants])
    except Exception as e:
        logger.error(f"获取租户列表失败: {e}")
        return jsonify({"error": str(e)}), 500


@tenants_bp.route('', methods=['POST'])
def create_tenant():
    """创建新租户"""
    try:
        data = request.get_json()
        if not data or not data.get('tenant_id') or not data.get('name'):
            return jsonify({"error": "tenant_id 和 name 为必填项"}), 400

        tenant_id = data['tenant_id'].strip()
        name = data['name'].strip()

        if not tenant_id or not name:
            return jsonify({"error": "tenant_id 和 name 不能为空"}), 400

        with db_manager.get_session() as session:
            existing = session.query(Tenant).filter(Tenant.tenant_id == tenant_id).first()
            if existing:
                return jsonify({"error": f"租户 '{tenant_id}' 已存在"}), 409

            tenant = Tenant(
                tenant_id=tenant_id,
                name=name,
                description=data.get('description', ''),
                config=json.dumps(data.get('config', {}))
            )
            session.add(tenant)
            session.commit()

            # 重新查询以获取完整数据
            tenant = session.query(Tenant).filter(Tenant.tenant_id == tenant_id).first()
            return jsonify({"success": True, "tenant": tenant.to_dict()}), 201

    except Exception as e:
        logger.error(f"创建租户失败: {e}")
        return jsonify({"error": str(e)}), 500


@tenants_bp.route('/<tenant_id>', methods=['PUT'])
def update_tenant(tenant_id):
    """更新租户信息（重命名等）"""
    try:
        data = request.get_json()
        if not data:
            return jsonify({"error": "请求体不能为空"}), 400

        with db_manager.get_session() as session:
            tenant = session.query(Tenant).filter(Tenant.tenant_id == tenant_id).first()
            if not tenant:
                return jsonify({"error": f"租户 '{tenant_id}' 不存在"}), 404

            if 'name' in data:
                tenant.name = data['name'].strip()
            if 'description' in data:
                tenant.description = data['description']
            if 'config' in data:
                tenant.config = json.dumps(data['config'])
            if 'is_active' in data:
                tenant.is_active = data['is_active']

            session.commit()
            tenant = session.query(Tenant).filter(Tenant.tenant_id == tenant_id).first()
            return jsonify({"success": True, "tenant": tenant.to_dict()})

    except Exception as e:
        logger.error(f"更新租户失败: {e}")
        return jsonify({"error": str(e)}), 500


@tenants_bp.route('/<tenant_id>', methods=['DELETE'])
def delete_tenant(tenant_id):
    """删除租户（不允许删除 default）"""
    try:
        if tenant_id == DEFAULT_TENANT:
            return jsonify({"error": "不能删除默认租户"}), 403

        with db_manager.get_session() as session:
            tenant = session.query(Tenant).filter(Tenant.tenant_id == tenant_id).first()
            if not tenant:
                return jsonify({"error": f"租户 '{tenant_id}' 不存在"}), 404

            session.delete(tenant)
            session.commit()
            return jsonify({"success": True, "message": f"租户 '{tenant_id}' 已删除"})

    except Exception as e:
        logger.error(f"删除租户失败: {e}")
        return jsonify({"error": str(e)}), 500