generator client {
  provider = "prisma-client"
  output   = "../src/generated/prisma"
}

// 兼容 seed 脚本在 Node.js 直接运行时使用 @prisma/client runtime。
generator seed_client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "postgresql"
}

// 角色枚举：用于鉴权与数据可见性控制。
enum Role {
  SYSTEM_ADMIN
  HOSPITAL_ADMIN
  DIRECTOR
  LEADER
  DOCTOR
  ENGINEER
}

// 设备状态枚举：表示设备是否处于使用中。
enum DeviceStatus {
  ACTIVE
  INACTIVE
}

// 任务状态枚举：定义任务流转状态机。
enum TaskStatus {
  PENDING
  ACCEPTED
  COMPLETED
  CANCELLED
}

// 医院主表：多租户顶层实体。
model Hospital {
  id          Int          @id @default(autoincrement())
  name        String
  departments Department[]
  users       User[]
  patients    Patient[]
  tasks       Task[]
}

// 科室表：归属于医院。
model Department {
  id         Int      @id @default(autoincrement())
  name       String
  hospitalId Int
  hospital   Hospital @relation(fields: [hospitalId], references: [id])
  groups     Group[]
  users      User[]

  @@index([hospitalId])
}

// 小组表：归属于科室。
model Group {
  id           Int        @id @default(autoincrement())
  name         String
  departmentId Int
  department   Department @relation(fields: [departmentId], references: [id])
  users        User[]

  @@index([departmentId])
}

// 用户表：支持后台密码登录与小程序 openId。
model User {
  id              Int         @id @default(autoincrement())
  name            String
  phone           String
  // 后台登录密码哈希（bcrypt）。
  passwordHash    String?
  // 该时间点之前签发的 token 一律失效。
  tokenValidAfter DateTime    @default(now())
  openId          String?     @unique
  role            Role
  hospitalId      Int?
  departmentId    Int?
  groupId         Int?
  hospital        Hospital?   @relation(fields: [hospitalId], references: [id])
  department      Department? @relation(fields: [departmentId], references: [id])
  // 小组删除必须先清理成员，避免静默把用户 groupId 置空。
  group           Group?      @relation(fields: [groupId], references: [id], onDelete: Restrict)
  doctorPatients  Patient[]   @relation("DoctorPatients")
  createdTasks    Task[]      @relation("TaskCreator")
  acceptedTasks   Task[]      @relation("TaskEngineer")

  @@unique([phone, role, hospitalId])
  @@index([phone])
  @@index([hospitalId, role])
  @@index([departmentId, role])
  @@index([groupId, role])
}

// 患者表：院内患者档案，按医院隔离。
model Patient {
  id         Int      @id @default(autoincrement())
  name       String
  phone      String
  // 患者身份证号，录入与查询都使用原始证件号。
  idCard     String
  hospitalId Int
  doctorId   Int
  hospital   Hospital @relation(fields: [hospitalId], references: [id])
  doctor     User     @relation("DoctorPatients", fields: [doctorId], references: [id])
  devices    Device[]

  @@index([phone, idCard])
  @@index([hospitalId, doctorId])
}

// 设备表：患者可绑定多个分流设备。
model Device {
  id              Int          @id @default(autoincrement())
  snCode          String       @unique
  currentPressure Int
  status          DeviceStatus @default(ACTIVE)
  patientId       Int
  patient         Patient      @relation(fields: [patientId], references: [id])
  taskItems       TaskItem[]

  @@index([patientId, status])
}

// 主任务表：记录调压任务主单。
model Task {
  id         Int        @id @default(autoincrement())
  status     TaskStatus @default(PENDING)
  creatorId  Int
  engineerId Int?
  hospitalId Int
  createdAt  DateTime   @default(now())
  creator    User       @relation("TaskCreator", fields: [creatorId], references: [id])
  engineer   User?      @relation("TaskEngineer", fields: [engineerId], references: [id])
  hospital   Hospital   @relation(fields: [hospitalId], references: [id])
  items      TaskItem[]

  @@index([hospitalId, status, createdAt])
}

// 任务明细表：一个任务可包含多个设备调压项。
model TaskItem {
  id             Int    @id @default(autoincrement())
  taskId         Int
  deviceId       Int
  oldPressure    Int
  targetPressure Int
  task           Task   @relation(fields: [taskId], references: [id], onDelete: Cascade)
  device         Device @relation(fields: [deviceId], references: [id])

  @@index([taskId])
  @@index([deviceId])
}