KennethCheng/FuelLog
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FuelLog/fuellog-api/go.sum
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KennethCheng df5db7bc36 feat(backend): service 层与 DTO,核心计算逻辑落位 
Phase 1.3a。Phase 1.2 留的 repo 现在有了真正的业务出口,Phase 1.3b 紧接
handler / router 把 HTTP 接进来,业务就能跑通。

新增:
- pkg/decimal/money.go
  * PricePerLiter(total, liters)   服务端实时算实际油价,落库
  * ConsumptionL100km(l, mileage)  百公里油耗,只用于 is_full 序列
  * CostPerKm(amount, mileage)     每公里成本
  * Mileage(cur, prev)             行驶里程,负数 / 零视为无效
  * AvgFloat64(xs)                 求平均,空切片返回 0
  全部走 shopspring/decimal,避免 float64 累计误差

- internal/dto/dto.go
  * VehicleCreate / VehicleUpdate (patch 语义,*T 表示可选)
  * RefuelCreate / RefuelUpdate
  入参校验走 gin-validator 的 tag:required / gte / gt / max
  (Liters > 0、TotalAmount >= 0、Odometer >= 0 与 plan §16 一致)

- internal/service/vehicle.go
  * Create 时若 default_vehicle=true,事务内先 ClearDefault 再 Insert,
    避免出现两个默认车辆
  * Update 同样事务化 default 切换
  * SetDefault 是显式接口,业务上"切默认车"是常用操作
  全部错误用 apperror 包成 NotFound / InvalidArg / Internal

- internal/service/refuel_record.go
  * Create:校验车辆存在 + Liters > 0 + TotalAmount >= 0,服务端
    实时计算 price_per_liter,RefuelTime 统一转 UTC 存库
  * Update:patch 语义,liters / total_amount 任一变更都重新算
    price_per_liter(否则历史单价会失真)
  * Statistics(单车):返回 累计次数 / 累计升数 / 累计金额 / 平均油价 /
    标准百公里油耗 / 每公里成本 / 最近一次加油
    关键实现:仅在"连续两次 is_full=true"之间采油耗样本,
    半箱油 / 部分加油记录不会污染标准油耗 ——
    这条规则直接来自 plan §6.3 与 §19 验收要求

业务规则(AGENTS.md 强约束):
  车辆名称 / 能源类型 不允许为空(trim 后空字符串也拒)
  加油量 > 0、总金额 >= 0、里程 >= 0 都在 service 入参立即校验
  RefuelTime 统一 UTC 存库,展示按本地时区格式化
  默认车辆唯一,切换走事务,杜绝"两个默认"

未做(留给 Phase 1.3b 下一个 commit):
- HTTP handler / router / main 装配
- 单元测试(本文件不含测试,等所有 service 稳定后单独提一个测试 commit)
- Dashboard / 统计 API(基础 Statistics 已就绪,Dashboard endpoint
  留给 Phase 1.3b 末尾)

验证:
  go mod tidy    all modules verified
  go vet ./...   0 issues
  go build       25.9 MB binary
2026-09-13 16:06:21 +08:00

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modernc.org/mathutil v1.5.0/go.mod h1:mZW8CKdRPY1v87qxC/wUdX5O1qDzXMP5TH3wjfpga6E=
modernc.org/memory v1.5.0 h1:N+/8c5rE6EqugZwHii4IFsaJ7MUhoWX07J5tC/iI5Ds=
modernc.org/memory v1.5.0/go.mod h1:PkUhL0Mugw21sHPeskwZW4D6VscE/GQJOnIpCnW6pSU=
modernc.org/sqlite v1.23.1 h1:nrSBg4aRQQwq59JpvGEQ15tNxoO5pX/kUjcRNwSAGQM=
modernc.org/sqlite v1.23.1/go.mod h1:OrDj17Mggn6MhE+iPbBNf7RGKODDE9NFT0f3EwDzJqk=
nullprogram.com/x/optparse v1.0.0/go.mod h1:KdyPE+Igbe0jQUrVfMqDMeJQIJZEuyV7pjYmp6pbG50=
rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
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