from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session

from backend.app.api.deps import require_permissions, require_roles
from backend.app.db import get_db_session
from backend.app.schemas.common import success_payload
from backend.app.services.order_service import OrderService

router = APIRouter(prefix='/api/orders', tags=['sales-flow'])


@router.get('/flow-overview')
def flow_overview(
    order_service: OrderService = Depends(),
    session: Session = Depends(get_db_session),
    current_user: dict = Depends(require_roles('salesman', 'manager', 'admin')),
    _permission_user: dict = Depends(require_permissions('order:list')),
) -> dict:
    orders = order_service.list_orders(session, order_service.normalize_list_filters({}, current_user))
    detail_orders = [order_service.get_order(item['order_id'], session, current_user) for item in orders[:5]]
    detail_orders = [item for item in detail_orders if item]
    review_items = []
    traces = []
    ai_items = []
    notices = []
    for item in detail_orders:
        if item.get('order_status') in {'pending_approve', 'approved'}:
            review_items.append({
                'orderNo': item.get('order_no'),
                'customerName': item.get('customer_name'),
                'amount': f"{item.get('sale_price_total', 0):.2f}",
            })
        trace_list = item.get('logistics_info', {}).get('trace_list', [])
        for trace in trace_list[:2]:
            traces.append({
                'title': f"订单 {item.get('order_no')} 物流节点",
                'detail': trace.get('node_desc') or trace.get('remark') or '物流节点更新',
                'time': trace.get('node_time') or '',
            })
        for attach in item.get('attachments', [])[:1]:
            ai_items.append({
                'name': attach.get('file_name') or '识别附件',
                'raw': item.get('customer_name', ''),
                'corrected': item.get('customer_name', ''),
            })
    pending_count = sum(1 for item in orders if item.get('order_status') == 'pending_approve')
    draft_count = sum(1 for item in orders if item.get('order_status') == 'draft')
    fulfillment_count = sum(1 for item in orders if item.get('order_status') in {'approved', 'pending_factory', 'pending_delivery', 'delivering'})
    if not notices:
        notices = [
            {'title': '物流超时提醒', 'detail': '演示订单首节点超过 48 小时未更新。', 'read': False},
            {'title': '欠款超期提醒', 'detail': '演示客户账期已超 7 天。', 'read': False},
        ]
    return success_payload({
        'orders': [
            {
                'order_no': item.get('order_no'),
                'customer_name': item.get('customer_name'),
                'order_status': item.get('order_status'),
                'sale_price_total': item.get('sale_price_total', 0),
            }
            for item in orders[:10]
        ],
        'review_items': review_items,
        'traces': traces or [
            {'title': '订单提交审核', 'detail': '业务员提交订单后进入审核队列。', 'time': '2026-05-21 09:00'},
            {'title': '审核通过', 'detail': '管理层确认通过并生成发厂文案。', 'time': '2026-05-21 09:20'},
        ],
        'ai_items': ai_items or [
            {'name': '物流单-001', 'raw': '客户A / 13900000000', 'corrected': '客户A / 13900000000'},
        ],
        'notices': notices,
        'stats': {
            'draft': draft_count,
            'pending': pending_count,
            'fulfillment': fulfillment_count,
        },
    })