from flask import Blueprint, jsonify, request  # .material -> .base refactor checked
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
from app.services.trans_service import TransService
from app.services.borrow_service import BorrowApprovalService
import traceback

trans_bp = Blueprint('transactions', __name__, url_prefix='/transactions')


# ==============================================================================
# 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。
    """
    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 ['*']
    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 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
    user = SysUser.query.get(identity)
    return user.id if user else None, user.role if user else None


def filter_item_by_permissions(item_dict, user_permissions, prefix='op_records'):
    """
    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 = {
        # 'borrow_no': f'{prefix}:borrow_no',
        # 'borrower_name': f'{prefix}:borrower_name',
        # 'sku': f'{prefix}:sku',
        # 'borrow_time': f'{prefix}:borrow_time',
        # 'return_time': f'{prefix}:return_time',
        # 'return_operator': f'{prefix}:return_operator',
        # 'status': f'{prefix}:status',
        # 'expected_return_time': f'{prefix}:expected_return_time',
        # 'return_location': f'{prefix}:return_location',
        # 'borrow_signature': f'{prefix}:borrow_signature',
        # 'return_signature': f'{prefix}:return_signature',
    }
    # 如果用户是超级管理员且有 '*'，则不过滤
    if '*' 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
    return item_dict


# --- 借库接口 ---
@trans_bp.route('/borrow', methods=['POST'])
@jwt_required()
@permission_required('op_borrow:operation')
@audit_log(
    module='借库管理',
    action='新增',
    get_target_name_fn=lambda: request.get_json().get('borrow_no') if request.get_json() else None
)
def create_borrow():
    data = request.get_json()
    try:
        no = TransService.create_borrow(data)
        return jsonify({'code': 200, 'msg': '借用成功', 'data': {'borrow_no': no}})
    except Exception as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400


# --- 还库辅助：扫码查找借出记录 ---
@trans_bp.route('/return/scan', methods=['GET'])
@jwt_required()
@permission_required('op_return')
def scan_borrowed_item():
    barcode = request.args.get('barcode')
    if not barcode:
        return jsonify({'code': 400, 'msg': '无条码'}), 400

    res = TransService.scan_for_return(barcode)
    if res:
        return jsonify({'code': 200, 'data': res})
    else:
        return jsonify({'code': 404, 'msg': '未找到该物品的未还记录'}), 404


# --- 还库提交 ---
@trans_bp.route('/return', methods=['POST'])
@jwt_required()
@permission_required('op_return:operation')
@audit_log(
    module='借库管理',
    action='归还',
    get_target_name_fn=lambda: request.get_json().get('borrow_no') if request.get_json() else None
)
def submit_return():
    data = request.get_json()
    user = get_jwt_identity()  # 库管
    try:
        TransService.process_return(data, operator_name=user)
        return jsonify({'code': 200, 'msg': '还库成功'})
    except Exception as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400


# --- 记录列表 ---
@trans_bp.route('/records', methods=['GET'])
@jwt_required()
@permission_required('op_records')
def get_records():
    status = request.args.get('status', 'all')
    page = int(request.args.get('page', 1))
    keyword = request.args.get('keyword', '')
    search_type = request.args.get('search_type', 'all')

    res = TransService.get_records(page=page, limit=10, status=status, keyword=keyword, search_type=search_type)
    # 字段级脱敏
    user_permissions = get_current_user_permissions()
    if res.get('items'):
        res['items'] = [filter_item_by_permissions(item, user_permissions, 'op_records') for item in res['items']]
    return jsonify({'code': 200, 'data': res})


# ==============================================================================
# 借库审批流 API（与出库审批流平行）
# ==============================================================================

# --- 提交借库申请 ---
@trans_bp.route('/borrow/request', methods=['POST'])
@jwt_required()
def submit_borrow_request():
    """
    提交借库申请（仅存储意向，不扣库存）
    请求体: { items: [...], allowed_approvers: [...], remark: '', approver_id: int }
    """
    try:
        user_id, user_role = get_current_user_info()
        if not user_id:
            return jsonify({'code': 401, 'msg': '用户未登录'}), 401

        from app.models.system import SysUser
        current_user = SysUser.query.get(user_id)
        current_username = current_user.username if current_user else None

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

        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 str(item.get(f) or '').strip() == '']
            if missing:
                return jsonify({
                    'code': 400,
                    'msg': f'第{idx + 1}条物品缺少必填字段: {", ".join(missing)}'
                }), 400
            try:
                qty = float(item.get('quantity', 0))
                if qty <= 0:
                    return jsonify({'code': 400, 'msg': f'第{idx + 1}条物品的借库数量必须大于0'}), 400
            except (TypeError, ValueError):
                return jsonify({'code': 400, 'msg': f'第{idx + 1}条物品的 quantity 格式无效'}), 400

        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

        approval = BorrowApprovalService.submit_approval(
            applicant_id=user_id,
            items=items,
            allowed_approvers=allowed_approvers,
            remark=data.get('remark'),
            approver_id=approver_id,
            borrower_name=current_username
        )

        return jsonify({'code': 200, 'msg': '借库申请已提交', 'data': approval.to_dict()}), 200

    except ValueError as e:
        return jsonify({'code': 400, 'msg': str(e)}), 400
    except Exception as e:
        return jsonify({'code': 500, 'msg': f"接口内部报错: {str(e)}", 'trace': traceback.format_exc()}), 500


# --- 审批借库申请 ---
@trans_bp.route('/borrow/request/<int:request_id>/approve', methods=['PATCH'])
@jwt_required()
def approve_borrow_request(request_id):
    """
    审批借库申请
    请求体: {"action": "approve" | "reject", "reject_reason": "驳回原因"}
    """
    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 = BorrowApprovalService.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


# --- 获取借库审批单列表 ---
@trans_bp.route('/borrow/request', methods=['GET'])
@jwt_required()
def get_borrow_request_list():
    """
    获取借库审批单列表
    Query参数: page, limit, applicant_id, status
    """
    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 = BorrowApprovalService.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:
        return jsonify({'code': 500, 'msg': str(e)}), 500


# --- 执行借库扣减（审批通过后调用）---
@trans_bp.route('/borrow/dispatch', methods=['POST'])
@jwt_required()
@permission_required('op_borrow:operation')
def dispatch_borrow():
    """
    执行借库扣减
    请求体: {
        approval_id: int,   // 关联的审批单ID
        items: [...],       // 扫码选中的库存物品（含 id, source_table, out_quantity）
        borrower_name: str,
        signature_path: str,
        remark: str,
        expected_return_time: str
    }
    """
    try:
        data = request.get_json() or {}
        approval_id = data.get('approval_id')
        if not approval_id:
            return jsonify({'code': 400, 'msg': '缺少 approval_id'}), 400

        borrow_no = TransService.execute_dispatch(
            approval_id=approval_id,
            items=data.get('items', []),
            operator_name=get_jwt_identity(),
            borrower_name=data.get('borrower_name'),
            signature=data.get('signature_path'),
            remark=data.get('remark'),
            expected_return_time=data.get('expected_return_time')
        )

        return jsonify({'code': 200, 'msg': '借库成功', 'data': {'borrow_no': borrow_no}}), 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