// 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            Int              @id @default(autoincrement())
  email         String           @unique
  username      String           @unique
  passwordHash  String
  displayName   String?
  avatarUrl     String?
  role          String           @default("user") // admin, user, moderator
  isActive      Boolean          @default(true)
  createdAt     DateTime         @default(now())
  updatedAt     DateTime         @updatedAt

  oauth2Tokens      OAuth2Token[]
  oauth2AuthCodes   OAuth2AuthorizationCode[]
  articles          Article[]
  comments          Comment[]
  reactions         Reaction[]      @relation("UserReactions")
  follows           Follow[]       @relation("FollowFollower")
  followees         Follow[]       @relation("FollowFollowee")
  subscriptions     Subscription[] @relation("SubscriptionSubscriber")
  targets           Subscription[] @relation("SubscriptionTarget")
  notifications     Notification[] @relation("UserNotifications")
  editedVersions    ArticleVersion[] @relation("ArticleVersionEditor")
  reviewedCommentAudits CommentAudit[] @relation("CommentAuditReviewer")
}

model OAuth2Client {
  id            Int              @id @default(autoincrement())
  clientId      String           @unique
  clientSecret  String
  redirectUris  String[]         // JSON array of URIs
  scopes        String           @default("read write")
  createdAt     DateTime         @default(now())

  tokens        OAuth2Token[]
  authCodes     OAuth2AuthorizationCode[]
}

model OAuth2AuthorizationCode {
  id            Int              @id @default(autoincrement())
  codeHash      String           @unique
  clientId      String
  userId        Int?
  redirectUri   String
  scopes        String
  expiresAt     DateTime
  used          Boolean          @default(false)
  createdAt     DateTime         @default(now())

  client        OAuth2Client     @relation(fields: [clientId], references: [clientId])
  user          User?            @relation(fields: [userId], references: [id])
}

model OAuth2Token {
  id             Int              @id @default(autoincrement())
  accessTokenHash  String        @unique
  refreshTokenHash String?       @unique
  clientId       String
  userId         Int?
  scopes         String
  expiresAt      DateTime
  revoked        Boolean          @default(false)
  createdAt      DateTime         @default(now())

  client         OAuth2Client     @relation(fields: [clientId], references: [clientId])
  user           User?           @relation(fields: [userId], references: [id])

  @@index([userId])
  @@index([clientId])
}

model Article {
  id             Int              @id @default(autoincrement())
  slug           String           @unique
  title          String
  content        String?          // Markdown content
  excerpt        String?
  coverImageUrl  String?
  status         String           @default("draft") // draft, published, archived
  visibility     String           @default("public") // public, unlisted, private
  passwordHash   String?          // for password-protected articles
  token          String?          @unique // for token-based access
  viewCount      Int              @default(0) // number of views
  publishedAt    DateTime?
  createdAt      DateTime         @default(now())
  updatedAt      DateTime         @updatedAt

  authorId       Int
  author         User             @relation(fields: [authorId], references: [id])
  versions       ArticleVersion[] @relation("ArticleVersions")
  comments       Comment[]
  reactions      Reaction[]       @relation("ArticleReactions")
  linkAccesses   LinkAccess[]     @relation("ArticleLinkAccess")

  @@index([authorId])
}

model ArticleVersion {
  id          Int      @id @default(autoincrement())
  articleId   Int
  version     Int
  title       String
  content     String?
  excerpt     String?
  editorId    Int?
  createdAt   DateTime @default(now())

  article     Article  @relation("ArticleVersions", fields: [articleId], references: [id])
  editor      User?    @relation("ArticleVersionEditor", fields: [editorId], references: [id])

  @@unique([articleId, version])
}

model Comment {
  id            Int              @id @default(autoincrement())
  articleId     Int
  parentId      Int?
  content       String
  status        String           @default("pending") // pending, approved, rejected, suspicious
  authorName    String?
  authorEmail   String?
  authorId      Int?             // registered user
  ipAddress     String?
  userAgent     String?
  createdAt     DateTime         @default(now())
  updatedAt     DateTime         @updatedAt

   article       Article          @relation(fields: [articleId], references: [id])
   parent        Comment?         @relation("CommentReplies", fields: [parentId], references: [id])
   replies       Comment[]        @relation("CommentReplies")
   audits        CommentAudit[]   @relation("CommentAudits")
   author        User?            @relation(fields: [authorId], references: [id])

  @@index([articleId, status, parentId])
  @@index([authorId])
}

model CommentAudit {
  id          Int      @id @default(autoincrement())
  commentId   Int
  status      String   // approved, rejected, suspicious
  reason      String?  // rule reason or AI decision
  score       Float?   // AI confidence score
  reviewerId  Int?     // null for AI
  reviewedAt  DateTime @default(now())

  comment     Comment  @relation("CommentAudits", fields: [commentId], references: [id])
  reviewer    User?    @relation("CommentAuditReviewer", fields: [reviewerId], references: [id])

  @@unique([commentId])
}

model LinkAccess {
  id        Int      @id @default(autoincrement())
  token     String   @unique
  articleId Int
  expiresAt DateTime?
  maxViews  Int?
  viewCount Int      @default(0)
  createdAt DateTime @default(now())

  article   Article  @relation("ArticleLinkAccess", fields: [articleId], references: [id])
}

model Reaction {
  id        Int      @id @default(autoincrement())
  articleId Int
  userId    Int
  type      String   // like, love, wow, etc.
  createdAt DateTime @default(now())

  article   Article  @relation("ArticleReactions", fields: [articleId], references: [id])
  user      User     @relation("UserReactions", fields: [userId], references: [id])

  @@unique([userId, articleId, type])
}

model Follow {
  id        Int      @id @default(autoincrement())
  followerId Int
  followeeId Int
  createdAt DateTime @default(now())

  follower  User     @relation("FollowFollower", fields: [followerId], references: [id])
  followee  User     @relation("FollowFollowee", fields: [followeeId], references: [id])

  @@unique([followerId, followeeId])
}

model Subscription {
  id           Int      @id @default(autoincrement())
  subscriberId Int
  targetId     Int?
  type         String   // article, user, comment
  createdAt    DateTime @default(now())

  subscriber   User     @relation("SubscriptionSubscriber", fields: [subscriberId], references: [id])
  target       User?    @relation("SubscriptionTarget", fields: [targetId], references: [id])

  @@unique([subscriberId, targetId, type])
}

model Notification {
  id        Int      @id @default(autoincrement())
  userId    Int
  type      String   // comment_reply, reaction, follow, system
  title     String
  message   String
  isRead    Boolean  @default(false)
  createdAt DateTime @default(now())

   user      User     @relation("UserNotifications", fields: [userId], references: [id])

  @@index([userId])
}

model EmailMessage {
  id          Int      @id @default(autoincrement())
  to          String
  subject     String
  body        String
  status      String   @default("pending") // pending, sent, failed
  attempts    Int      @default(0)
  lastError   String?
  scheduledAt DateTime @default(now())
  sentAt      DateTime?
  createdAt   DateTime @default(now())

  @@index([status, createdAt])
}

model AnalyticsEvent {
  id        String   @id @default(cuid())
  type      String   // page_view, article_view, comment_submit, etc.
  userId    Int?
  sessionId String?
  ip        String?
  userAgent String?
  data      Json?    // additional event data
  createdAt DateTime @default(now())

  @@index([type, createdAt])
  @@index([userId])
  @@index([sessionId])
}

model AnalyticsAggregate {
  id        Int      @id @default(autoincrement())
  date      DateTime // truncated to day
  type      String   // page_views, unique_visitors, etc.
  value     Int
  metadata  Json?

  @@unique([date, type])
}