// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

generator client {
  provider = "prisma-client-js"
}

datasource db {
  provider = "mysql"
  url      = env("DATABASE_URL")
}

model AssetType {
  id            Int       @id @default(autoincrement())
  name          String    @unique @db.VarChar(50)
  status        String    @default("active") @db.VarChar(20)
  can_be_parent Boolean   @default(false)  // 可作为父资产
  can_be_child  Boolean   @default(false)  // 可作为子资产
  created_at    DateTime  @default(now())
  updated_at    DateTime  @updatedAt

  equipments  Equipment[]

  @@index([status])
  @@map("asset_type")
}

model Department {
  id          Int          @id @default(autoincrement())
  name        String       @unique @db.VarChar(100)
  status      String       @default("active") @db.VarChar(20)
  parent_id   Int?         // 父部门ID，null表示根部门
  created_at  DateTime     @default(now())
  updated_at  DateTime     @updatedAt

  // 自关联 - 部门层级
  parent      Department?  @relation("DepartmentHierarchy", fields: [parent_id], references: [id])
  children    Department[] @relation("DepartmentHierarchy")
  
  equipments  Equipment[]

  @@index([status])
  @@index([parent_id])
  @@map("department")
}

model Equipment {
  id                  Int       @id @default(autoincrement())
  equipment_code      String    @unique @db.VarChar(50)
  equipment_name      String    @db.VarChar(100)
  equipment_model     String?   @db.VarChar(100)
  equipment_type      String    @db.VarChar(50)
  code_generation_mode String   @default("auto") @db.VarChar(20)
  status              String    @default("可用") @db.VarChar(20)
  total_quantity      Int       @default(0)
  remaining_quantity  Int       @default(0)
  unit_price          Decimal   @default(0.00) @db.Decimal(10, 2)
  total_value         Decimal   @default(0.00) @db.Decimal(12, 2)
  borrowed_value      Decimal   @default(0.00) @db.Decimal(12, 2)
  available_value     Decimal   @default(0.00) @db.Decimal(12, 2)
  description         String?   @db.Text
  purchase_date       DateTime? @db.Date
  supplier            String?   @db.VarChar(100)
  storage_location_id Int?
  asset_type_id       Int?
  department_id       Int?
  // 父子资产关联字段
  parent_id           Int?      // 父资产ID（如果已挂载）
  mount_status        String    @default("none") @db.VarChar(20) // none/mounted/unmounted
  total_value_with_children Decimal @default(0.00) @db.Decimal(12, 2) // 含配件总价值
  created_at          DateTime  @default(now())
  updated_at          DateTime  @updatedAt

  borrow_records      BorrowRecord[]
  storageLocation     StorageLocation? @relation(fields: [storage_location_id], references: [id])
  assetType           AssetType?       @relation(fields: [asset_type_id], references: [id])
  department          Department?      @relation(fields: [department_id], references: [id])
  // 父子资产自关联
  parent              Equipment?       @relation("ParentChild", fields: [parent_id], references: [id])
  children            Equipment[]      @relation("ParentChild")
  // 挂载历史关联
  mountHistories      MountHistory[]
  // 报废记录关联
  disposalRecords     DisposalRecord[]
  // 维修记录关联
  maintenanceRecords  MaintenanceRecord[]

  @@index([equipment_code])
  @@index([equipment_type])
  @@index([status])
  @@index([code_generation_mode])
  @@index([unit_price])
  @@index([storage_location_id])
  @@index([asset_type_id])
  @@index([department_id])
  @@index([parent_id])
  @@index([mount_status])
  @@map("equipment")
}

model BorrowRecord {
  id                   Int       @id @default(autoincrement())
  equipment_id         Int
  equipment_code       String    @db.VarChar(50)
  person_id            Int
  person_name          String    @db.VarChar(50)
  person_nickname      String    @db.VarChar(50)
  person_identifier    String?   @db.VarChar(50)
  borrow_time          DateTime  @default(now())
  expected_return_time DateTime?
  is_long_term         Boolean   @default(false)
  return_time          DateTime?
  status               String    @default("已借出") @db.VarChar(20)
  return_condition     String    @default("正常") @db.VarChar(20)
  notes                String?   @db.Text
  children_snapshot    String?   @db.Text  // JSON格式的配件快照
  created_at           DateTime  @default(now())
  updated_at           DateTime  @updatedAt

  equipment Equipment @relation(fields: [equipment_id], references: [id])
  person    Person    @relation(fields: [person_id], references: [id])

  @@index([equipment_id])
  @@index([person_id])
  @@index([status])
  @@index([borrow_time])
  @@map("borrow_record")
}

model User {
  id             Int             @id @default(autoincrement())
  username       String          @unique @db.VarChar(50)
  password       String          @db.VarChar(255)
  name           String          @db.VarChar(50)
  email          String?         @db.VarChar(100)
  phone          String?         @db.VarChar(20)
  role           String          @default("user") @db.VarChar(20)
  status         String          @default("active") @db.VarChar(20)
  last_login_at  DateTime?       @db.DateTime
  created_at     DateTime        @default(now())
  updated_at     DateTime        @updatedAt

  operation_logs OperationLog[]
  site_configs   SiteConfig[]    @relation("SiteConfigUpdatedBy")
  mount_histories MountHistory[]
  // 报废记录关联
  disposal_applied   DisposalRecord[]    @relation("DisposalApplier")
  disposal_approved  DisposalRecord[]    @relation("DisposalApprover")
  // 维修记录关联
  maintenance_records MaintenanceRecord[]

  @@index([role])
  @@index([status])
  @@map("user")
}

model SiteConfig {
  id          Int       @id @default(autoincrement())
  site_name   String    @db.VarChar(100)
  logo_url    String?   @db.VarChar(255)
  favicon_url String?   @db.VarChar(255)
  theme_color String?   @db.VarChar(20)
  updated_by  Int?
  created_at  DateTime  @default(now())
  updated_at  DateTime  @default(now())

  updatedBy   User?     @relation("SiteConfigUpdatedBy", fields: [updated_by], references: [id])

  @@map("site_config")
}

model Person {
  id          Int             @id @default(autoincrement())
  nickname    String          @db.VarChar(50)
  real_name   String          @db.VarChar(50)
  id_number   String?         @unique @db.VarChar(50)
  department  String?         @db.VarChar(100)
  position    String?         @db.VarChar(100)
  phone       String?         @db.VarChar(20)
  email       String?         @db.VarChar(100)
  status      String          @default("active") @db.VarChar(20)
  remarks     String?         @db.Text
  created_at  DateTime        @default(now())
  updated_at  DateTime        @updatedAt

  borrow_records BorrowRecord[]

  @@index([nickname])
  @@index([real_name])
  @@index([status])
  @@map("person")
}

model StorageLocation {
  id          Int          @id @default(autoincrement())
  name        String       @db.VarChar(100)
  code        String?      @db.VarChar(50)
  status      String       @default("active") @db.VarChar(20)
  description String?      @db.Text
  created_at  DateTime     @default(now())
  updated_at  DateTime     @updatedAt

  equipments  Equipment[]

  @@index([status])
  @@map("storage_location")
}

model OperationLog {
  id                  Int       @id @default(autoincrement())
  user_id             Int?
  username            String?   @db.VarChar(50)
  operation_type      String    @db.VarChar(50)
  equipment_id        Int?
  equipment_code      String?   @db.VarChar(50)
  operation_details   String?   @db.Text
  ip_address          String?   @db.VarChar(50)
  created_at          DateTime  @default(now())

  user                User?     @relation(fields: [user_id], references: [id])

  @@index([user_id])
  @@index([operation_type])
  @@index([created_at])
  @@map("operation_log")
}


model MountHistory {
  id              Int       @id @default(autoincrement())
  child_id        Int       // 子资产ID
  parent_id       Int?      // 父资产ID
  operation_type  String    @db.VarChar(20) // mount/unmount/replace
  operated_at     DateTime  @default(now())
  operated_by     Int       // 操作人ID
  notes           String?   @db.Text
  old_parent_id   Int?      // 更换时的旧父资产ID
  new_parent_id   Int?      // 更换时的新父资产ID

  child           Equipment @relation(fields: [child_id], references: [id])
  operator        User      @relation(fields: [operated_by], references: [id])

  @@index([child_id])
  @@index([parent_id])
  @@index([operation_type])
  @@index([operated_at])
  @@map("mount_history")
}

// 报废记录
model DisposalRecord {
  id              Int       @id @default(autoincrement())
  equipment_id    Int
  equipment_code  String    @db.VarChar(50)
  disposal_reason String    @db.Text          // 报废原因
  disposal_method String    @db.VarChar(50)   // 处置方式：报废/转让/捐赠
  estimated_value Decimal   @db.Decimal(12,2) // 残值估价
  actual_value    Decimal?  @db.Decimal(12,2) // 实际处置价值
  status          String    @default("pending") @db.VarChar(20) // pending/approved/rejected/completed
  applied_by      Int       // 申请人
  applied_at      DateTime  @default(now())
  approved_by     Int?      // 审批人
  approved_at     DateTime?
  completed_at    DateTime? // 完成时间
  notes           String?   @db.Text
  created_at      DateTime  @default(now())
  updated_at      DateTime  @updatedAt

  equipment       Equipment @relation(fields: [equipment_id], references: [id])
  applier         User      @relation("DisposalApplier", fields: [applied_by], references: [id])
  approver        User?     @relation("DisposalApprover", fields: [approved_by], references: [id])

  @@index([equipment_id])
  @@index([status])
  @@map("disposal_record")
}

// 维修记录
model MaintenanceRecord {
  id                  Int       @id @default(autoincrement())
  equipment_id        Int
  equipment_code      String    @db.VarChar(50)
  issue_description   String    @db.Text          // 故障描述
  repair_vendor       String?   @db.VarChar(100)  // 维修商
  estimated_cost      Decimal   @db.Decimal(10,2) // 预估费用
  actual_cost         Decimal?  @db.Decimal(10,2) // 实际费用
  start_date          DateTime  @default(now())   // 送修日期
  expected_end_date   DateTime?                   // 预计完成日期
  actual_end_date     DateTime?                   // 实际完成日期
  status              String    @default("in_progress") @db.VarChar(20) // in_progress/completed/cancelled
  repair_result       String?   @db.Text          // 维修结果
  created_by          Int
  created_at          DateTime  @default(now())
  updated_at          DateTime  @updatedAt

  equipment           Equipment @relation(fields: [equipment_id], references: [id])
  creator             User      @relation(fields: [created_by], references: [id])

  @@index([equipment_id])
  @@index([status])
  @@map("maintenance_record")
}