from flask import Blueprint, request, jsonify
from app.services.outbound_service import OutboundService
from flask_jwt_extended import jwt_required, get_jwt_identity, get_jwt
from app.utils.decorators import permission_required, audit_log
from app.services.auth_service import AuthService
import traceback

outbound_bp = Blueprint('outbound', __name__, url_prefix='/outbound')


# ==============================================================================
# 辅助函数：获取当前用户的完整权限列表（基于角色查询）
# ==============================================================================
def get_current_user_permissions():
    """
    返回当前用户拥有的所有权限码列表（包括菜单和元素）
    此函数根据角色查询数据库得到权限。
    """
    from flask_jwt_extended import get_jwt
    from app.services.auth_service import AuthService
    claims = get_jwt()
    user_role = claims.get('role')
    if not user_role:
        return []
    # 超级管理员返回所有字段权限 (忽略大小写)
    if user_role.upper() == 'SUPER_ADMIN':
        return ['outbound_list:*']
    perm_dict = AuthService.get_user_permissions(user_role)
    # 合并菜单和元素权限
    perms = perm_dict.get('menus', []) + perm_dict.get('elements', [])
    return perms


def filter_item_by_permissions(item_dict, user_permissions):
    """
    根据用户权限过滤 item 字典，无权限的字段值置为 None
    """
    # 字段名到权限码的映射（与前端 permissionMap 保持一致）
    field_to_perm = {
        'outbound_no': 'outbound_list:outbound_no',
        'outbound_time': 'outbound_list:outbound_time',
        'outbound_type': 'outbound_list:outbound_type',
        'total_amount': 'outbound_list:total_amount',
        'consumer_name': 'outbound_list:consumer_name',
        'operator_name': 'outbound_list:operator_name',
        'remark': 'outbound_list:remark',
        'signature_path': 'outbound_list:signature_path',
        # 明细字段
        'sku': 'outbound_list:sku',
        'name': 'outbound_list:name',
        'material_type': 'outbound_list:material_type',
        'category': 'outbound_list:category',
        'spec_model': 'outbound_list:spec_model',
        'quantity': 'outbound_list:quantity',
        'unit_price': 'outbound_list:unit_price',
        'subtotal': 'outbound_list:subtotal',
    }
    # 如果用户是超级管理员且有 'outbound_list:*'，则不过滤
    if 'outbound_list:*' in user_permissions:
        return item_dict
    for field, perm_code in field_to_perm.items():
        if field in item_dict and perm_code not in user_permissions:
            item_dict[field] = None
    # 如果 item_dict 中包含 items 列表，递归处理每个子项
    if 'items' in item_dict and isinstance(item_dict['items'], list):
        for sub_item in item_dict['items']:
            filter_item_by_permissions(sub_item, user_permissions)
    return item_dict


# --------------------------------------------------------
# 1. 扫码查询库存接口 (关联三个库存表)
# GET /api/v1/outbound/scan?barcode=...
# --------------------------------------------------------
@outbound_bp.route('/scan', methods=['GET'])
@jwt_required()
@permission_required('outbound_selection')
def scan_barcode():
    barcode = request.args.get('barcode')
    if not barcode:
        return jsonify({'code': 400, 'msg': '请提供条码'}), 400

    try:
        # 调用 Service 层去三个表中查找 (Service已更新，会返回价格)
        result = OutboundService.get_stock_by_barcode(barcode)

        if result:
            return jsonify({
                'code': 200,
                'msg': '扫描成功',
                'data': result
            })
        else:
            return jsonify({
                'code': 404,
                'msg': '未找到对应的库存记录，请确认条码是否正确'
            }), 404

    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'扫描查询出错: {str(e)}'}), 500


# --------------------------------------------------------
# 2. 提交出库单接口 (批量)
# POST /api/v1/outbound
# --------------------------------------------------------
@outbound_bp.route('', methods=['POST'])
@jwt_required()
@audit_log(
    module='出库管理',
    action='新增',
    get_target_name_fn=lambda: request.get_json().get('order_no') if request.get_json() else None
)
def create_outbound():
    # 权限检查：需要 outbound_create:operation 或 outbound_selection:operation 之一
    claims = get_jwt()
    user_role = claims.get('role')
    if not user_role:
        return jsonify({'code': 403, 'msg': '未授权'}), 403

    # 超级管理员直接放行
    if user_role.upper() != 'SUPER_ADMIN':
        perm_dict = AuthService.get_user_permissions(user_role)
        perms = perm_dict.get('menus', []) + perm_dict.get('elements', [])
        if ('outbound_create:operation' not in perms) and ('outbound_selection:operation' not in perms):
            return jsonify({'code': 403, 'msg': '权限不足'}), 403

    data = request.get_json()
    if not data:
        return jsonify({'code': 400, 'msg': '无有效数据'}), 400

    # 获取当前登录用户名 (JWT identity)
    current_user_name = get_jwt_identity()
    if not current_user_name:
        current_user_name = 'Unknown'

    # 获取最终的操作员名称
    final_operator = data.get('operator_name')
    if not final_operator:
        final_operator = current_user_name

    # 必填校验 (针对整个单据)
    # items 必须是列表且不为空，consumer_name 和 signature_path 必填
    if 'items' not in data or not data['items']:
        return jsonify({'code': 400, 'msg': '出库商品列表不能为空'}), 400

    if not data.get('consumer_name') or not data.get('signature_path'):
        return jsonify({'code': 400, 'msg': '领用人及签名信息缺失'}), 400

    try:
        # ★ [修改] 调用批量创建服务
        outbound_no = OutboundService.create_outbound_batch(data, operator_name=final_operator)
        return jsonify({
            'code': 200,
            'msg': '出库成功',
            'data': {'outbound_no': outbound_no}
        })
    except ValueError as e:
        # 业务逻辑错误 (如库存不足)
        return jsonify({'code': 400, 'msg': str(e)}), 400
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'服务器内部错误: {str(e)}'}), 500


# --------------------------------------------------------
# 3. 获取出库记录列表 (分组展示)
# GET /api/v1/outbound
# --------------------------------------------------------
@outbound_bp.route('', methods=['GET'])
@jwt_required()
@permission_required('outbound_list')
def get_outbound_list():
    try:
        page = int(request.args.get('page', 1))
        limit = int(request.args.get('limit', 10))
        keyword = request.args.get('keyword', '')
        search_type = request.args.get('search_type', 'all')
        # 如果前端传了日期范围，可以解析处理，这里暂略

        # ★ [修改] 调用分组查询服务，支持搜索类型
        result = OutboundService.get_grouped_list(page, limit, keyword, search_type=search_type)

        # 字段级脱敏
        user_permissions = get_current_user_permissions()
        if result.get('items'):
            result['items'] = [filter_item_by_permissions(item, user_permissions) for item in result['items']]

        return jsonify({
            'code': 200,
            'msg': '获取成功',
            'data': result
        })
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': str(e)}), 500


# ==============================================================================
# 出库审批相关接口
# ==============================================================================

from app.services.outbound_service import OutboundApprovalService


def get_current_user_id():
    """获取当前用户ID"""
    from app.models.system import SysUser
    identity = get_jwt_identity()
    if not identity:
        return None
    # JWT identity 是数据库主键整数，直接用 .get() 查询
    user = SysUser.query.get(identity)
    return user.id if user else None


def get_current_user_info():
    """获取当前用户信息和角色"""
    from app.models.system import SysUser
    identity = get_jwt_identity()
    if not identity:
        return None, None
    # JWT identity 是数据库主键整数，直接用 .get() 查询
    user = SysUser.query.get(identity)
    return user.id if user else None, user.role if user else None


# --------------------------------------------------------
# 4. 创建出库审批单
# POST /api/v1/outbound/request
# --------------------------------------------------------
@outbound_bp.route('/request', methods=['POST'])
@jwt_required()
def create_outbound_request():
    """
    创建出库审批单（申请阶段，用户只需提交宏观物料信息，无需关联具体库存记录）

    请求体示例:
    {
        "items": [
            {
                "name": "物料A",           // 物料名称 (必填)
                "spec_model": "规格1",     // 规格型号 (必填)
                "quantity": 10,            // 计划出库数量 (必填)
                "warehouse_location": "A区-01-01", // 库位 (可选)
                "remark": "备注信息"       // 物品备注 (可选)
            }
        ],
        "allowed_approvers": [
            {"type": "role", "value": "SUPERVISOR"},
            {"type": "role", "value": "SUPER_ADMIN"}
        ],
        "remark": "紧急出库申请"
    }
    """
    try:
        user_id, user_role = get_current_user_info()
        if not user_id:
            return jsonify({'code': 401, 'msg': '用户未登录'}), 401

        data = request.get_json()
        if not data:
            return jsonify({'code': 400, 'msg': '无有效数据'}), 400

        items = data.get('items', [])
        if not items:
            return jsonify({'code': 400, 'msg': '出库物品列表不能为空'}), 400

        # ★ 申请阶段仅校验宏观字段：名称、规格、数量
        required_fields = ['name', 'spec_model', 'quantity']
        for idx, item in enumerate(items):
            missing = [f for f in required_fields if f not in item or item.get(f) is None or str(item.get(f)).strip() == '']
            if missing:
                return jsonify({
                    'code': 400,
                    'msg': f'第{idx + 1}条物品缺少必填字段: {", ".join(missing)}。'
                           f'必须包含: name(名称), spec_model(规格), quantity(数量)'
                }), 400
            try:
                qty = float(item.get('quantity', 0))
                if qty <= 0:
                    return jsonify({'code': 400, 'msg': f'第{idx + 1}条物品的出库数量必须大于0'}), 400
            except (TypeError, ValueError):
                return jsonify({'code': 400, 'msg': f'第{idx + 1}条物品的 quantity 格式无效'}), 400

        # ★ 指定审批人：前端传 approver_id 则精准通知，否则用默认角色规则
        approver_id = data.get('approver_id')
        _default_approvers = [
            {"type": "role", "value": "SUPERVISOR"},
            {"type": "role", "value": "SUPER_ADMIN"}
        ]
        allowed_approvers = data.get('allowed_approvers') or _default_approvers

        # 创建审批单（直接存储前端传来的宏观信息快照，不查询库存）
        approval = OutboundApprovalService.create_request(
            applicant_id=user_id,
            items=items,
            allowed_approvers=allowed_approvers,
            remark=data.get('remark'),
            approver_id=approver_id
        )

        return jsonify({
            'code': 200,
            'msg': '审批单创建成功',
            'data': approval.to_dict()
        }), 200

    except ValueError as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400
    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'服务器内部错误: {str(e)}'}), 500


# --------------------------------------------------------
# 5. 审批出库申请
# PATCH /api/v1/outbound/request/<id>/approve
# --------------------------------------------------------
@outbound_bp.route('/request/<int:request_id>/approve', methods=['PATCH'])
@jwt_required()
def approve_outbound_request(request_id):
    """
    审批出库申请

    请求体示例:
    {
        "action": "approve",    // "approve" 通过, "reject" 驳回
        "reject_reason": "库存不足"  // 仅在驳回时需要
    }
    """
    try:
        user_id, user_role = get_current_user_info()
        if not user_id:
            return jsonify({'code': 401, 'msg': '用户未登录'}), 401

        data = request.get_json() or {}
        action = data.get('action', 'approve')
        reject_reason = data.get('reject_reason')

        if action not in ('approve', 'reject'):
            return jsonify({'code': 400, 'msg': '无效的审批操作，仅支持 approve 或 reject'}), 400

        if action == 'reject' and not reject_reason:
            return jsonify({'code': 400, 'msg': '驳回时必须提供原因'}), 400

        success, message, approval = OutboundApprovalService.approve(
            request_id=request_id,
            user_id=user_id,
            user_role=user_role,
            action=action,
            reject_reason=reject_reason
        )

        if not success:
            return jsonify({'code': 400, 'msg': message}), 400

        return jsonify({
            'code': 200,
            'msg': message,
            'data': approval.to_dict() if approval else None
        }), 200

    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': f'服务器内部错误: {str(e)}'}), 500


# --------------------------------------------------------
# 6. 获取审批单列表
# GET /api/v1/outbound/request
# --------------------------------------------------------
@outbound_bp.route('/request', methods=['GET'])
@jwt_required()
def get_outbound_request_list():
    """
    获取出库审批单列表

    Query参数:
    - page: 页码 (默认1)
    - limit: 每页数量 (默认10)
    - applicant_id: 按申请人筛选 (可选)
    - status: 按状态筛选 (0待审/1通过/2驳回/3完成, 可选)
    """
    try:
        page = int(request.args.get('page', 1))
        limit = int(request.args.get('limit', 10))

        applicant_id = request.args.get('applicant_id')
        if applicant_id:
            applicant_id = int(applicant_id)

        status = request.args.get('status')
        if status is not None:
            status = int(status)

        result = OutboundApprovalService.get_request_list(
            page=page,
            per_page=limit,
            applicant_id=applicant_id,
            status=status
        )

        return jsonify({
            'code': 200,
            'msg': '获取成功',
            'data': result
        }), 200

    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': str(e)}), 500


# --------------------------------------------------------
# 7. 获取单个审批单详情
# GET /api/v1/outbound/request/<id>
# --------------------------------------------------------
@outbound_bp.route('/request/<int:request_id>', methods=['GET'])
@jwt_required()
def get_outbound_request_detail(request_id):
    """获取出库审批单详情"""
    try:
        approval = OutboundApprovalService.get_request_by_id(request_id)

        if not approval:
            return jsonify({'code': 404, 'msg': '审批单不存在'}), 404

        return jsonify({
            'code': 200,
            'msg': '获取成功',
            'data': approval.to_dict()
        }), 200

    except Exception as e:
        traceback.print_exc()
        return jsonify({'code': 500, 'msg': str(e)}), 500