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

datasource db {
  provider = "postgresql"
}

enum Role {
  SYSTEM_ADMIN
  HOSPITAL_ADMIN
  DIRECTOR
  LEADER
  DOCTOR
  ENGINEER
}

enum DeviceStatus {
  ACTIVE
  INACTIVE
}

enum TaskStatus {
  PENDING
  ACCEPTED
  COMPLETED
  CANCELLED
}

model Hospital {
  id          Int          @id @default(autoincrement())
  name        String
  departments Department[]
  users       User[]
  patients    Patient[]
  tasks       Task[]
}

model Department {
  id         Int      @id @default(autoincrement())
  name       String
  hospitalId Int
  hospital   Hospital @relation(fields: [hospitalId], references: [id])
  groups     Group[]
  users      User[]

  @@index([hospitalId])
}

model Group {
  id           Int        @id @default(autoincrement())
  name         String
  departmentId Int
  department   Department @relation(fields: [departmentId], references: [id])
  users        User[]

  @@index([departmentId])
}

model User {
  id            Int       @id @default(autoincrement())
  name          String
  phone         String
  // Backend login password hash (bcrypt).
  passwordHash  String?
  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])
  group         Group?      @relation(fields: [groupId], references: [id])
  doctorPatients Patient[]  @relation("DoctorPatients")
  createdTasks   Task[]     @relation("TaskCreator")
  acceptedTasks  Task[]     @relation("TaskEngineer")

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

model Patient {
  id         Int      @id @default(autoincrement())
  name       String
  phone      String
  idCardHash String
  hospitalId Int
  doctorId   Int
  hospital   Hospital @relation(fields: [hospitalId], references: [id])
  doctor     User     @relation("DoctorPatients", fields: [doctorId], references: [id])
  devices    Device[]

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

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])
}

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])
}

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])
}