// prisma/schema.prisma - SQLite版本（快速启动）

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

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

// ==================== 租户 ====================

model Tenant {
  id               Int         @id @default(autoincrement())
  name          String
  loginAccount  String?  @unique @map("login_account")
  passwordHash  String?  @map("password_hash")
  address       String?
  contactPerson String?  @map("contact_person")
  contactPhone  String?  @map("contact_phone")
  logoUrl       String?  @map("logo_url")

  packageType   String   @default("STANDARD") @map("package_type")
  teacherQuota  Int      @default(20) @map("teacher_quota")
  studentQuota  Int      @default(200) @map("student_quota")
  storageQuota  BigInt   @default(5368709120) @map("storage_quota")

  startDate     String   @map("start_date")
  expireDate    String   @map("expire_date")

  teacherCount  Int      @default(0) @map("teacher_count")
  studentCount  Int      @default(0) @map("student_count")
  storageUsed   BigInt   @default(0) @map("storage_used")

  status        String   @default("ACTIVE")

  createdAt     DateTime @default(now()) @map("created_at")
  updatedAt     DateTime @updatedAt @map("updated_at")

  teachers      Teacher[]
  students      Student[]
  classes       Class[]
  lessons       Lesson[]
  tenantCourses TenantCourse[]
  growthRecords GrowthRecord[]
  tasks         Task[]
  taskTemplates TaskTemplate[]
  parents       Parent[]
  notifications Notification[]
  settings      SystemSettings?
  schedulePlans SchedulePlan[]
  scheduleTemplates ScheduleTemplate[]
  operationLogs OperationLog[]

  @@map("tenants")
}

// ==================== 教师 ====================

model Teacher {
  id               Int         @id @default(autoincrement())
  tenantId      Int         @map("tenant_id")
  name         String
  phone        String
  email        String?

  loginAccount String   @unique @map("login_account")
  passwordHash String   @map("password_hash")
  classIds     String?  @default("[]") @map("class_ids") // 保留，向后兼容（只读缓存）

  status       String   @default("ACTIVE")

  lessonCount  Int      @default(0) @map("lesson_count")
  feedbackCount Int      @default(0) @map("feedback_count")

  createdAt    DateTime @default(now()) @map("created_at")
  updatedAt    DateTime @updatedAt @map("updated_at")
  lastLoginAt  DateTime? @map("last_login_at")

  tenant       Tenant   @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  classes      Class[]
  lessons      Lesson[]
  feedbacks    LessonFeedback[]
  classTeachers ClassTeacher[]  // 新增：多对多关联
  schedulePlans SchedulePlan[]
  scheduleTemplates ScheduleTemplate[]

  @@map("teachers")
}

// ==================== 班级 ====================

model Class {
  id               Int         @id @default(autoincrement())
  tenantId      Int         @map("tenant_id")
  name         String
  grade        String

  teacherId      Int?       @map("teacher_id")  // 保留，向后兼容

  studentCount Int      @default(0) @map("student_count")
  lessonCount  Int      @default(0) @map("lesson_count")

  createdAt    DateTime @default(now()) @map("created_at")
  updatedAt    DateTime @updatedAt @map("updated_at")

  tenant       Tenant   @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  teacher      Teacher? @relation(fields: [teacherId], references: [id])
  students     Student[]
  lessons      Lesson[]
  growthRecords GrowthRecord[]
  classTeachers    ClassTeacher[]  // 新增：多对多关联
  studentHistory   StudentClassHistory[] @relation("ToClass")  // 新增：调班历史
  fromHistory      StudentClassHistory[] @relation("FromClass")  // 新增：调班历史
  schedulePlans    SchedulePlan[]
  scheduleTemplates ScheduleTemplate[]

  @@map("classes")
}

// ==================== 学生 ====================

model Student {
  id               Int         @id @default(autoincrement())
  tenantId      Int         @map("tenant_id")
  classId      Int         @map("class_id")
  name         String
  gender       String?
  birthDate    DateTime? @map("birth_date")
  parentPhone  String?   @map("parent_phone")
  parentName   String?   @map("parent_name")

  readingCount Int       @default(0) @map("reading_count")
  lessonCount  Int       @default(0) @map("lesson_count")

  createdAt    DateTime  @default(now()) @map("created_at")
  updatedAt    DateTime  @updatedAt @map("updated_at")

  tenant       Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  class        Class     @relation(fields: [classId], references: [id], onDelete: Cascade)
  records      StudentRecord[]
  growthRecords GrowthRecord[]
  taskCompletions TaskCompletion[]
  parents       ParentStudent[]
  classHistory  StudentClassHistory[]  // 新增：调班历史

  @@map("students")
}

// ==================== 课程包 ====================

model Course {
  id               Int         @id @default(autoincrement())
  name             String
  description      String?

  pictureBookId      Int?        @map("picture_book_id")
  pictureBookName  String?     @map("picture_book_name")

  // 封面图片 - 存储文件路径（不再是 base64）
  coverImagePath   String?     @map("cover_image_path")

  // 数字资源 - 存储多文件路径（JSON数组 [{path, name}]）
  ebookPaths      String?     @map("ebook_paths")

  audioPaths      String?     @map("audio_paths")

  videoPaths      String?     @map("video_paths")

  otherResources  String?     @map("other_resources") // JSON数组存储多个资源 {path, name}

  // 教学材料 - 存储文件路径（不再是 base64）
  pptPath          String?     @map("ppt_path")
  pptName          String?     @map("ppt_name")

  posterPaths      String?     @map("poster_paths") // JSON数组存储多个挂图 {path, name}

  // 实体教具和学生材料
  tools            String?     @map("tools")             // JSON数组存储教具列表 [{name, quantity}]
  studentMaterials String?     @map("student_materials") // 学生材料文本

  // 课堂计划
  lessonPlanData   String?     @map("lesson_plan_data")  // JSON存储课堂计划数据

  // 延伸活动
  activitiesData   String?     @map("activities_data")   // JSON存储延伸活动数据

  // 测评工具
  assessmentData   String?     @map("assessment_data")   // JSON存储测评工具数据

  gradeTags        String      @default("[]") @map("grade_tags")
  domainTags       String      @default("[]") @map("domain_tags")

  duration         Int         @default(25)

  status           String      @default("DRAFT")  // DRAFT, PENDING, REJECTED, PUBLISHED, ARCHIVED
  version          String      @default("1.0")

  // 审核相关字段
  submittedAt      DateTime?   @map("submitted_at")    // 提交审核时间
  submittedBy      Int?        @map("submitted_by")    // 提交人ID
  reviewedAt       DateTime?   @map("reviewed_at")     // 审核时间
  reviewedBy       Int?        @map("reviewed_by")     // 审核人ID
  reviewComment    String?     @map("review_comment")  // 审核意见
  reviewChecklist  String?     @map("review_checklist") // 审核检查项结果 JSON

  // 版本相关字段
  parentId         Int?        @map("parent_id")       // 父版本ID（迭代时指向原版本）
  isLatest         Boolean     @default(true)          // 是否最新版本

  usageCount       Int         @default(0) @map("usage_count")
  teacherCount     Int         @default(0) @map("teacher_count")
  avgRating        Float       @default(0) @map("avg_rating")

  createdBy        Int?        @map("created_by")

  createdAt        DateTime    @default(now()) @map("created_at")
  updatedAt        DateTime    @updatedAt @map("updated_at")
  publishedAt      DateTime?   @map("published_at")

  resources        CourseResource[]
  scripts          CourseScript[]
  activities       CourseActivity[]
  lessons          Lesson[]
  tenantCourses    TenantCourse[]
  versions         CourseVersion[]
  tasks            Task[]
  taskTemplates    TaskTemplate[]
  schedulePlans    SchedulePlan[]
  scheduleTemplates ScheduleTemplate[]

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

// ==================== 课程版本历史 ====================

model CourseVersion {
  id             Int      @id @default(autoincrement())
  courseId       Int      @map("course_id")
  version        String                            // 版本号
  snapshotData   String                            // JSON快照（完整课程内容）
  changeLog      String?                           // 变更说明
  publishedAt    DateTime  @default(now()) @map("published_at")
  publishedBy    Int       @map("published_by")

  course         Course   @relation(fields: [courseId], references: [id], onDelete: Cascade)

  @@index([courseId])
  @@map("course_versions")
}

// ==================== 课程资源 ====================

model CourseResource {
  id               Int         @id @default(autoincrement())
  courseId      Int         @map("course_id")
  resourceType  String         @map("resource_type")
  resourceName  String         @map("resource_name")
  fileUrl       String         @map("file_url")
  fileSize      Int?        @map("file_size")
  mimeType      String?        @map("mime_type")
  metadata      String?

  sortOrder     Int            @default(0) @map("sort_order")

  createdAt     DateTime       @default(now()) @map("created_at")

  course        Course         @relation(fields: [courseId], references: [id], onDelete: Cascade)

  @@map("course_resources")
}

// ==================== 课程脚本 ====================

model CourseScript {
  id               Int         @id @default(autoincrement())
  courseId            Int         @map("course_id")
  stepIndex           Int       @map("step_index")
  stepName            String    @map("step_name")
  stepType            String    @map("step_type")

  duration            Int
  objective           String?
  teacherScript       String?   @map("teacher_script")
  interactionPoints   String?   @map("interaction_points")

  resourceIds         String?   @map("resource_ids")

  sortOrder           Int       @default(0) @map("sort_order")

  createdAt           DateTime  @default(now()) @map("created_at")
  updatedAt           DateTime  @updatedAt @map("updated_at")

  course              Course    @relation(fields: [courseId], references: [id], onDelete: Cascade)
  pages               CourseScriptPage[]

  @@unique([courseId, stepIndex])
  @@map("course_scripts")
}

// ==================== 逐页配置 ====================

model CourseScriptPage {
  id               Int         @id @default(autoincrement())
  scriptId      Int         @map("script_id")
  pageNumber            Int      @map("page_number")
  questions             String?
  interactionComponent  String?  @map("interaction_component")
  teacherNotes          String?  @map("teacher_notes")
  resourceIds           String?  @map("resource_ids")  // 关联资源ID列表，JSON数组

  createdAt             DateTime @default(now()) @map("created_at")
  updatedAt             DateTime @updatedAt @map("updated_at")

  script                CourseScript @relation(fields: [scriptId], references: [id], onDelete: Cascade)

  @@unique([scriptId, pageNumber])
  @@map("course_script_pages")
}

// ==================== 延伸活动 ====================

model CourseActivity {
  id               Int         @id @default(autoincrement())
  courseId          Int         @map("course_id")
  name              String

  domain            String?
  domainTagId       Int?            @map("domain_tag_id")
  activityType      String          @map("activity_type")
  duration          Int?

  onlineMaterials   String?         @map("online_materials")
  offlineMaterials  String?
  activityGuide     String?
  objectives        String?

  sortOrder         Int             @default(0) @map("sort_order")

  createdAt         DateTime        @default(now()) @map("created_at")

  course            Course          @relation(fields: [courseId], references: [id], onDelete: Cascade)

  @@map("course_activities")
}

// ==================== 授课记录 ====================

model Lesson {
  id               Int         @id @default(autoincrement())
  tenantId         Int         @map("tenant_id")
  teacherId        Int         @map("teacher_id")
  classId          Int         @map("class_id")
  courseId         Int         @map("course_id")
  schedulePlanId   Int?        @map("schedule_plan_id")

  plannedDatetime  DateTime?   @map("planned_datetime")
  startDatetime    DateTime?   @map("start_datetime")
  endDatetime      DateTime?   @map("end_datetime")
  actualDuration   Int?        @map("actual_duration")

  status           String      @default("PLANNED")

  overallRating    String?     @map("overall_rating")
  participationRating String?  @map("participation_rating")
  completionNote   String?     @map("completion_note")

  createdAt        DateTime    @default(now()) @map("created_at")
  updatedAt        DateTime    @updatedAt @map("updated_at")

  tenant           Tenant        @relation(fields: [tenantId], references: [id])
  teacher          Teacher       @relation(fields: [teacherId], references: [id])
  class            Class         @relation(fields: [classId], references: [id])
  course           Course        @relation(fields: [courseId], references: [id])
  schedulePlan     SchedulePlan? @relation(fields: [schedulePlanId], references: [id])
  feedbacks        LessonFeedback[]
  records          StudentRecord[]

  @@map("lessons")
}

// ==================== 课程反馈 ====================

model LessonFeedback {
  id               Int         @id @default(autoincrement())
  lessonId      Int         @map("lesson_id")
  teacherId      Int         @map("teacher_id")

  designQuality    Int?     @map("design_quality")
  participation    Int?
  goalAchievement  Int?     @map("goal_achievement")

  stepFeedbacks    String?  @map("step_feedbacks")

  pros             String?
  suggestions      String?

  activitiesDone   String?  @map("activities_done")

  createdAt        DateTime @default(now()) @map("created_at")
  updatedAt        DateTime @updatedAt @map("updated_at")

  lesson           Lesson   @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  teacher          Teacher  @relation(fields: [teacherId], references: [id])

  @@unique([lessonId, teacherId])
  @@map("lesson_feedbacks")
}

// ==================== 学生测评记录 ====================

model StudentRecord {
  id               Int         @id @default(autoincrement())
  lessonId      Int         @map("lesson_id")
  studentId      Int         @map("student_id")

  focus               Int?
  participation       Int?
  interest            Int?
  understanding       Int?

  domainAchievements  String?

  notes               String?

  createdAt           DateTime @default(now()) @map("created_at")
  updatedAt           DateTime @updatedAt @map("updated_at")

  lesson              Lesson   @relation(fields: [lessonId], references: [id], onDelete: Cascade)
  student             Student  @relation(fields: [studentId], references: [id])

  @@unique([lessonId, studentId])
  @@map("student_records")
}

// ==================== 标签体系 ====================

model Tag {
  id               Int         @id @default(autoincrement())
  level       Int
  code        String   @unique
  name        String
  parentId      Int?       @map("parent_id")

  description String?
  metadata    String?

  sortOrder   Int      @default(0) @map("sort_order")

  createdAt   DateTime @default(now()) @map("created_at")

  @@map("tags")
}

// ==================== 租户课程授权 ====================

model TenantCourse {
  id               Int         @id @default(autoincrement())
  tenantId      Int         @map("tenant_id")
  courseId     Int         @map("course_id")

  authorized   Boolean  @default(true)
  authorizedAt DateTime? @map("authorized_at")

  createdAt    DateTime @default(now()) @map("created_at")

  tenant       Tenant   @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  course       Course   @relation(fields: [courseId], references: [id], onDelete: Cascade)

  @@unique([tenantId, courseId])
  @@map("tenant_courses")
}

// ==================== 成长档案 ====================

model GrowthRecord {
  id          Int       @id @default(autoincrement())
  tenantId    Int       @map("tenant_id")
  studentId   Int       @map("student_id")
  classId     Int?      @map("class_id")
  recordType  String    @map("record_type")  // STUDENT, CLASS
  title       String
  content     String?
  images      String?   @map("images")       // JSON: ["path1", "path2"]
  recordDate  DateTime  @map("record_date")
  createdBy   Int       @map("created_by")
  createdAt   DateTime  @default(now())
  updatedAt   DateTime  @updatedAt

  tenant      Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  student     Student   @relation(fields: [studentId], references: [id], onDelete: Cascade)
  class       Class?    @relation(fields: [classId], references: [id], onDelete: SetNull)

  @@index([tenantId, studentId])
  @@index([tenantId, classId])
  @@map("growth_records")
}

// ==================== 阅读任务 ====================

model Task {
  id              Int       @id @default(autoincrement())
  tenantId        Int       @map("tenant_id")
  title           String
  description     String?
  taskType        String    @map("task_type")   // READING, ACTIVITY, HOMEWORK
  targetType      String    @map("target_type") // CLASS, STUDENT
  relatedCourseId Int?      @map("related_course_id")
  createdBy       Int       @map("created_by")
  startDate       DateTime  @map("start_date")
  endDate         DateTime  @map("end_date")
  status          String    @default("PUBLISHED") // DRAFT, PUBLISHED, ARCHIVED
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt

  tenant          Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  course          Course?   @relation(fields: [relatedCourseId], references: [id], onDelete: SetNull)
  targets         TaskTarget[]
  completions     TaskCompletion[]

  @@index([tenantId, status])
  @@map("tasks")
}

model TaskTarget {
  id        Int     @id @default(autoincrement())
  taskId    Int     @map("task_id")
  classId   Int?    @map("class_id")
  studentId Int?    @map("student_id")

  task      Task    @relation(fields: [taskId], references: [id], onDelete: Cascade)

  @@index([taskId, classId])
  @@index([taskId, studentId])
  @@map("task_targets")
}

model TaskCompletion {
  id            Int       @id @default(autoincrement())
  taskId        Int       @map("task_id")
  studentId     Int       @map("student_id")
  status        String    @default("PENDING") // PENDING, IN_PROGRESS, COMPLETED
  completedAt   DateTime? @map("completed_at")
  feedback      String?
  parentFeedback String?  @map("parent_feedback")
  createdAt     DateTime  @default(now())

  task          Task      @relation(fields: [taskId], references: [id], onDelete: Cascade)
  student       Student   @relation(fields: [studentId], references: [id], onDelete: Cascade)

  @@unique([taskId, studentId])
  @@map("task_completions")
}

// ==================== 任务模板 ====================

model TaskTemplate {
  id              Int       @id @default(autoincrement())
  tenantId        Int       @map("tenant_id")

  // 模板基本信息
  name            String
  description     String?
  taskType        String    @map("task_type")      // READING, ACTIVITY, HOMEWORK

  // 关联课程（可选）
  relatedCourseId Int?      @map("related_course_id")

  // 默认时间设置
  defaultDuration Int       @default(7) @map("default_duration") // 默认任务天数

  // 模板状态
  isDefault       Boolean   @default(false) @map("is_default")
  status          String    @default("ACTIVE") // ACTIVE, ARCHIVED

  // 创建者
  createdBy       Int       @map("created_by")
  createdAt       DateTime  @default(now())
  updatedAt       DateTime  @updatedAt

  tenant          Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  course          Course?   @relation(fields: [relatedCourseId], references: [id], onDelete: SetNull)

  @@index([tenantId, status])
  @@map("task_templates")
}

// ==================== 资源库 ====================

model ResourceLibrary {
  id          Int      @id @default(autoincrement())
  name        String
  libraryType String   @map("library_type") // PICTURE_BOOK, MATERIAL, TEMPLATE
  description String?
  coverImage  String?  @map("cover_image")
  tenantId    Int?     @map("tenant_id")    // NULL = 公共资源
  createdBy   Int      @map("created_by")
  status      String   @default("PUBLISHED")
  sortOrder   Int      @default(0)          @map("sort_order")
  createdAt   DateTime @default(now())
  updatedAt   DateTime @updatedAt

  items       ResourceItem[]

  @@index([libraryType, status])
  @@map("resource_libraries")
}

model ResourceItem {
  id          Int      @id @default(autoincrement())
  libraryId   Int      @map("library_id")
  title       String
  description String?
  fileType    String   @map("file_type") // IMAGE, PDF, VIDEO, AUDIO, PPT, OTHER
  filePath    String   @map("file_path")
  fileSize    Int?     @map("file_size")
  tags        String?                         // JSON: ["tag1", "tag2"]
  sortOrder   Int      @default(0)           @map("sort_order")
  createdAt   DateTime @default(now())

  library     ResourceLibrary @relation(fields: [libraryId], references: [id], onDelete: Cascade)

  @@index([libraryId])
  @@map("resource_items")
}

// ==================== 系统设置 ====================

model SystemSettings {
  id              Int      @id @default(autoincrement())
  tenantId        Int      @unique @map("tenant_id")
  schoolName      String?  @map("school_name")
  schoolLogo      String?  @map("school_logo")
  address         String?
  notifyOnLesson  Boolean  @default(true) @map("notify_on_lesson")
  notifyOnTask    Boolean  @default(true) @map("notify_on_task")
  notifyOnGrowth  Boolean  @default(false) @map("notify_on_growth")
  createdAt       DateTime @default(now()) @map("created_at")
  updatedAt       DateTime @updatedAt @map("updated_at")
  tenant          Tenant   @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  @@map("system_settings")
}

// ==================== 家长 ====================

model Parent {
  id            Int      @id @default(autoincrement())
  tenantId      Int      @map("tenant_id")
  name          String
  phone         String
  email         String?
  loginAccount  String   @unique @map("login_account")
  passwordHash  String   @map("password_hash")
  status        String   @default("ACTIVE")
  createdAt     DateTime @default(now()) @map("created_at")
  updatedAt     DateTime @updatedAt @map("updated_at")
  lastLoginAt   DateTime? @map("last_login_at")
  tenant        Tenant   @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  children      ParentStudent[]
  @@map("parents")
}

// ==================== 家长-学生关联 ====================

model ParentStudent {
  id           Int      @id @default(autoincrement())
  parentId     Int      @map("parent_id")
  studentId    Int      @map("student_id")
  relationship String   // FATHER, MOTHER, GRANDFATHER, GRANDMOTHER, OTHER
  createdAt    DateTime @default(now()) @map("created_at")
  parent       Parent   @relation(fields: [parentId], references: [id], onDelete: Cascade)
  student      Student  @relation(fields: [studentId], references: [id], onDelete: Cascade)
  @@unique([parentId, studentId])
  @@map("parent_students")
}

// ==================== 通知 ====================

model Notification {
  id               Int       @id @default(autoincrement())
  tenantId         Int       @map("tenant_id")
  recipientType    String    @map("recipient_type")  // TEACHER, SCHOOL, PARENT
  recipientId      Int       @map("recipient_id")
  title            String
  content          String
  notificationType String    @map("notification_type") // SYSTEM, TASK, LESSON, GROWTH
  relatedType      String?   @map("related_type")
  relatedId        Int?      @map("related_id")
  isRead           Boolean   @default(false) @map("is_read")
  readAt           DateTime? @map("read_at")
  createdAt        DateTime  @default(now()) @map("created_at")
  tenant           Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  @@index([tenantId, recipientType, recipientId])
  @@map("notifications")
}

// ==================== 班级教师关联 ====================

model ClassTeacher {
  id          Int       @id @default(autoincrement())
  classId     Int       @map("class_id")
  teacherId   Int       @map("teacher_id")
  role        String    @default("MAIN")  // MAIN主班, ASSIST配班, CARE保育员
  isPrimary   Boolean   @default(false)   // 是否班主任
  createdAt   DateTime  @default(now()) @map("created_at")
  updatedAt   DateTime  @updatedAt @map("updated_at")

  class       Class     @relation(fields: [classId], references: [id], onDelete: Cascade)
  teacher     Teacher   @relation(fields: [teacherId], references: [id], onDelete: Cascade)

  @@unique([classId, teacherId])
  @@map("class_teachers")
}

// ==================== 学生调班历史 ====================

model StudentClassHistory {
  id          Int       @id @default(autoincrement())
  studentId   Int       @map("student_id")
  fromClassId Int?      @map("from_class_id")
  toClassId   Int       @map("to_class_id")
  reason      String?
  operatedBy  Int?      @map("operated_by") // 操作人(教师ID)，可选
  createdAt   DateTime  @default(now()) @map("created_at")

  student     Student   @relation(fields: [studentId], references: [id])
  fromClass   Class?    @relation("FromClass", fields: [fromClassId], references: [id])
  toClass     Class     @relation("ToClass", fields: [toClassId], references: [id])

  @@map("student_class_history")
}

// ==================== 排课计划 ====================

model SchedulePlan {
  id              Int       @id @default(autoincrement())
  tenantId        Int       @map("tenant_id")

  // 关联信息
  classId         Int       @map("class_id")
  courseId        Int       @map("course_id")
  teacherId       Int?      @map("teacher_id")  // 可选，未分配时为空

  // 时间信息
  scheduledDate   DateTime? @map("scheduled_date")    // 具体日期
  scheduledTime   String?   @map("scheduled_time")    // 时间段 "09:00-09:30"
  weekDay         Int?      @map("week_day")          // 周几 (0-6)，用于重复排课

  // 重复规则
  repeatType      String    @default("NONE") @map("repeat_type") // NONE, DAILY, WEEKLY
  repeatEndDate   DateTime? @map("repeat_end_date")

  // 排课来源
  source          String    @default("SCHOOL") // SCHOOL(学校排课), TEACHER(教师预约)
  createdBy       Int       @map("created_by") // 创建人ID

  // 状态
  status          String    @default("ACTIVE") // ACTIVE, CANCELLED

  // 备注
  note            String?

  // 提醒
  reminderSent    Boolean   @default(false) @map("reminder_sent")
  reminderSentAt  DateTime? @map("reminder_sent_at")

  createdAt       DateTime  @default(now()) @map("created_at")
  updatedAt       DateTime  @updatedAt @map("updated_at")

  tenant          Tenant    @relation(fields: [tenantId], references: [id])
  class           Class     @relation(fields: [classId], references: [id])
  course          Course    @relation(fields: [courseId], references: [id])
  teacher         Teacher?  @relation(fields: [teacherId], references: [id])
  lessons         Lesson[]

  @@index([tenantId, classId])
  @@index([tenantId, teacherId])
  @@index([tenantId, scheduledDate])
  @@map("schedule_plans")
}

// ==================== 排课模板 ====================

model ScheduleTemplate {
  id             Int       @id @default(autoincrement())
  tenantId       Int       @map("tenant_id")

  // 模板基本信息
  name           String
  courseId       Int       @map("course_id")
  classId        Int?      @map("class_id")     // 可选，特定班级
  teacherId      Int?      @map("teacher_id")   // 可选，特定教师

  // 时间配置
  scheduledTime  String?   @map("scheduled_time")  // 时间段 "09:00-09:30"
  weekDay        Int?      @map("week_day")        // 周几 (0-6)
  duration       Int       @default(25)            // 课程时长（分钟）

  // 模板设置
  isDefault      Boolean   @default(false) @map("is_default")

  createdAt      DateTime  @default(now()) @map("created_at")
  updatedAt      DateTime  @updatedAt @map("updated_at")

  tenant         Tenant    @relation(fields: [tenantId], references: [id], onDelete: Cascade)
  course         Course    @relation(fields: [courseId], references: [id])
  class          Class?    @relation(fields: [classId], references: [id])
  teacher        Teacher?  @relation(fields: [teacherId], references: [id])

  @@index([tenantId])
  @@index([tenantId, courseId])
  @@map("schedule_templates")
}

// ==================== 操作日志 ====================

model OperationLog {
  id          Int       @id @default(autoincrement())
  tenantId    Int?      @map("tenant_id")
  userId      Int       @map("user_id")
  userType    String    @map("user_type")    // SCHOOL, TEACHER, PARENT, ADMIN
  action      String                         // CREATE, UPDATE, DELETE, LOGIN, etc.
  module      String                         // 教师管理, 学生管理, 排课管理, etc.
  description String
  targetId    Int?      @map("target_id")    // 操作对象ID
  oldValue    String?   @map("old_value")    // JSON格式
  newValue    String?   @map("new_value")    // JSON格式
  ipAddress   String?   @map("ip_address")
  userAgent   String?   @map("user_agent")
  createdAt   DateTime  @default(now()) @map("created_at")

  tenant      Tenant?   @relation(fields: [tenantId], references: [id], onDelete: SetNull)

  @@index([tenantId, userId])
  @@index([tenantId, createdAt])
  @@index([action, module])
  @@map("operation_logs")
}