// 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 = "postgresql"
  url      = env("DATABASE_URL")
}

model User {
  id                String   @id @default(uuid())
  phone             String?  @unique
  appleId           String?  @unique @map("apple_id")
  nickname          String?
  avatar            String?
  agreementAccepted Boolean  @default(false) @map("agreement_accepted")
  isPro             Boolean  @default(false) @map("is_pro") // 是否为付费会员
  proExpireDate     DateTime? @map("pro_expire_date") // 会员过期时间（可选，预留给订阅制）
  createdAt         DateTime @default(now()) @map("created_at")
  updatedAt         DateTime @updatedAt @map("updated_at")

  settings        UserSettings?
  learningProgress UserLearningProgress[]
  achievements    UserAchievement[]
  courses         UserCourse[]

  @@map("users")
}

model UserSettings {
  userId            String  @id @map("user_id")
  pushNotification Boolean @default(true) @map("push_notification")
  createdAt        DateTime @default(now()) @map("created_at")
  updatedAt        DateTime @updatedAt @map("updated_at")

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@map("user_settings")
}

model Course {
  id          String      @id @default(uuid())
  title       String
  subtitle    String?     // 课程副标题
  description String?
  coverImage  String?     @map("cover_image")
  type        String      @default("system")  // ✅ 新增：system | single
  status      String      @default("published")  // ✅ 新增：published | draft
  deletedAt   DateTime?   @map("deleted_at")  // ✅ 新增：软删除时间戳
  totalNodes  Int         @default(0) @map("total_nodes")
  createdAt   DateTime    @default(now()) @map("created_at")
  updatedAt   DateTime    @updatedAt @map("updated_at")

  chapters CourseChapter[]
  nodes    CourseNode[]
  userCourses UserCourse[]

  @@map("courses")
}

model CourseChapter {
  id          String      @id @default(uuid())
  courseId    String      @map("course_id")
  title       String
  orderIndex  Int         @map("order_index")
  createdAt   DateTime    @default(now()) @map("created_at")

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

  @@unique([courseId, orderIndex])
  @@map("course_chapters")
}

model CourseNode {
  id              String      @id @default(uuid())
  courseId        String      @map("course_id")
  chapterId       String?     @map("chapter_id") // 可选，支持无章节的节点
  title           String
  subtitle        String?
  orderIndex      Int         @map("order_index")
  duration        Int?        // 预估时长（分钟）
  unlockCondition String?     @map("unlock_condition") // 解锁条件
  createdAt       DateTime    @default(now()) @map("created_at")

  course  Course        @relation(fields: [courseId], references: [id], onDelete: Cascade)
  chapter CourseChapter? @relation(fields: [chapterId], references: [id], onDelete: SetNull)
  slides  NodeSlide[]
  learningProgress UserLearningProgress[]

  @@unique([courseId, orderIndex])
  @@map("course_nodes")
}

model NodeSlide {
  id          String   @id @default(uuid())
  nodeId      String   @map("node_id")
  slideType   String   @map("slide_type") // text | image | quiz | interactive
  orderIndex  Int      @map("order_index")
  content     Json     // 存储卡片内容（灵活结构）
  effect      String?  // fade_in | typewriter | slide_up
  interaction String?  // tap_to_reveal | zoom | parallax
  createdAt   DateTime @default(now()) @map("created_at")

  node CourseNode @relation(fields: [nodeId], references: [id], onDelete: Cascade)

  @@map("node_slides")
}

model UserLearningProgress {
  id             String    @id @default(uuid())
  userId         String    @map("user_id")
  nodeId         String    @map("node_id")
  status         String    @default("not_started") // not_started | in_progress | completed
  startedAt      DateTime? @map("started_at")
  completedAt    DateTime? @map("completed_at")
  totalStudyTime Int       @default(0) @map("total_study_time") // 总学习时长（秒）
  currentSlide   Int       @default(0) @map("current_slide") // 当前学习到的幻灯片位置
  completionRate Int       @default(0) @map("completion_rate") // 完成度（%）
  createdAt      DateTime  @default(now()) @map("created_at")
  updatedAt      DateTime  @updatedAt @map("updated_at")

  user User       @relation(fields: [userId], references: [id], onDelete: Cascade)
  node CourseNode @relation(fields: [nodeId], references: [id], onDelete: Cascade)

  @@unique([userId, nodeId])
  @@map("user_learning_progress")
}

model UserAchievement {
  id             String   @id @default(uuid())
  userId         String   @map("user_id")
  achievementType String  @map("achievement_type") // lesson_completed | course_completed
  achievementData Json    @map("achievement_data") // 存储成就详情
  createdAt      DateTime @default(now()) @map("created_at")

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@map("user_achievements")
}

model UserCourse {
  id           String    @id @default(uuid())
  userId       String    @map("user_id")
  courseId     String    @map("course_id")
  lastOpenedAt DateTime? @map("last_opened_at") // ✅ 新增：最近打开时间，用于排序
  createdAt    DateTime  @default(now()) @map("created_at")
  updatedAt    DateTime  @updatedAt @map("updated_at")

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

  @@unique([userId, courseId])
  @@map("user_courses")
}