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bindbox-game/.trae/documents/Add Cost Analysis to Lottery Simulation.md
邹方成 45815bfb7d chore: 清理无用文件与优化代码结构 
refactor(utils): 修复密码哈希比较逻辑错误
feat(user): 新增按状态筛选优惠券接口
docs: 添加虚拟发货与任务中心相关文档
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test: 补充订单折扣与积分转换测试用例
build: 更新配置文件与构建脚本
style: 清理多余的空行与注释
2025-12-18 17:35:55 +08:00

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Add Cost Analysis to Lottery Simulation

I will enhance the lottery simulation feature to include cost calculation and financial analysis.

1. Backend Changes (internal/api/admin/lottery_admin.go)

  • Update Response Structures:

    • Add Cost (int64) to simulateRewardStat (Unit cost in cents).
    • Add TotalCost (int64) to simulateRewardStat (WonCount * Cost).
    • Add TotalSimulationCost (int64) to simulateIssueResponse.
    • Add TotalSimulationRevenue (int64) to simulateIssueResponse (TotalDraws * Activity.PriceDraw).
    • Add GrossProfit (int64) to simulateIssueResponse (Revenue - Cost).
    • Add GrossProfitRate (float64) to simulateIssueResponse.

  • Logic Update:

    • In SimulateIssue:
      • Fetch the Activity details to get PriceDraw.
      • Collect all ProductIDs from the rewards.
      • Batch query the Products table to get prices.
      • Map product prices to rewards (if ProductID > 0).
      • Calculate financial stats after the simulation loop.

2. Frontend Changes (web/admin/src/views/operations/lottery-simulation/index.vue)

  • Update API Type Definition: Update SimulateRewardStat and SimulateIssueResponse interfaces in api/operations.ts.
  • UI Enhancement:
    • Summary Cards: Add a row of summary cards at the top of the results section showing:
      • Total Revenue (总收入)
      • Total Cost (总成本)
      • Gross Profit (毛利润)
      • Profit Margin (毛利率)
    • Table Columns:
      • Add "Unit Cost" (单价/成本) column.
      • Add "Total Cost" (总发放成本) column.

3. Verification

  • Verify compilation.
  • (Self-Correction) Ensure Price is handled as integer (cents) and formatted correctly in frontend (divided by 100).