含先进先出与报表的 POS 应用开发

---
name: comprehensive-pos-application-development-with-fifo-and-reporting
description: 开发一款功能完备的销售点（POS）应用，集成库存管理、先进先出（FIFO）成本核算及每日销售报表功能。
---

# 综合POS应用开发（含先进先出法与报表功能）

请扮演一名软件开发工程师。你的任务是构建一款功能完备的销售点（POS）应用，并集成每日销售报表功能。

你需要开发以下内容：
- **核心POS功能：**
  - 产品库存管理，支持采购价与销售价追踪
  - 销售交易处理
  - 实时库存更新
  - 面向收银员的用户友好型界面

- **先进先出（FIFO）实现：**
  - 实现先进先出（First-In-First-Out）库存管理机制
  - 按采购日期追踪产品批次
  - 自动优先售出最早入库的库存
  - 基于FIFO方法维持准确的成本核算

- **每日销售报表功能：**
  - 生成全面的每日销售报表，包括：
    - 当日总销售额
    - 当日总利润（按FIFO成本核算计算：销售价 − 采购价）
    - 交易笔数
    - 畅销产品列表
    - 销售完成后的库存余量

**技术规格要求：**
- 使用现代编程语言（{{language}}）
- 设计数据库结构，用于存储产品信息、交易记录及库存批次数据
- 实施完善的错误处理与数据校验机制
- 构建简洁、直观的用户界面
- 提供示例数据以供演示

**交付成果：**
1. 带完整注释的源代码
2. 数据库模式（schema）/结构定义
3. 安装与部署说明
4. 关键功能的示例截图或演示视频
5. 简要文档，说明FIFO实现原理与逻辑

确保该应用具备生产就绪（production-ready）能力，支持可靠的数据持久化，并能高效处理每日多笔交易。

---
name: comprehensive-pos-application-development-with-fifo-and-reporting
description: Develop a full-featured Point of Sales (POS) application integrating inventory management, FIFO costing, and daily sales reporting.
---

# Comprehensive POS Application Development with FIFO and Reporting

Act as a Software Developer. You are tasked with creating a comprehensive Point of Sales (POS) application with integrated daily sales reporting functionality.

Your task is to develop:
- **Core POS Features:**
  - Product inventory management with buy price and sell price tracking
  - Sales transaction processing
  - Real-time inventory updates
  - User-friendly interface for cashiers

- **FIFO Implementation:**
  - Implement First-In-First-Out inventory management
  - Track product batches with purchase dates
  - Automatically sell oldest stock first
  - Maintain accurate cost calculations based on FIFO methodology

- **Daily Sales Report Features:**
  - Generate comprehensive daily sales reports including:
    - Total daily sales revenue
    - Total daily profit (calculated as: sell price - buy price using FIFO costing)
    - Number of transactions
    - Best-selling products
    - Inventory levels after sales

**Technical Specifications:**
- Use a modern programming language ({{language}})
- Include a database design for storing products, transactions, and inventory batches
- Implement proper error handling and data validation
- Create a clean, intuitive user interface
- Include sample data for demonstration

**Deliverables:**
1. Complete source code with comments
2. Database schema/structure
3. Installation and setup instructions
4. Sample screenshots or demo of key features
5. Brief documentation explaining the FIFO implementation

Ensure the application is production-ready with proper data persistence and can handle multiple daily transactions efficiently.