// Prisma schema for Login-Less Real-Time Agile Kanban Board (PostgreSQL)

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

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

enum Priority {
  LOW
  MEDIUM
  HIGH
  URGENT
}

model Board {
  id            String   @id @default(uuid())
  title         String   @default("Agile Kanban Board")
  adminKeyHash  String
  memberKeyHash String
  autoMoveStale Boolean  @default(false) // Auto move stale cards to Backlog
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt

  columns       Column[]
  activityLogs  ActivityLog[]

  @@index([updatedAt])
}

model Column {
  id             String   @id @default(uuid())
  boardId        String
  board          Board    @relation(fields: [boardId], references: [id], onDelete: Cascade)
  title          String
  order          Int      @default(0)
  maxWipLimit    Int      @default(0) // 0 = unlimited, >0 = max cards limit
  autoStaleHours Int      @default(0) // 0 = disabled, >0 = hours before marking stale
  createdAt      DateTime @default(now())
  updatedAt      DateTime @updatedAt

  tickets        Ticket[]

  @@index([boardId, order])
}

model Ticket {
  id            String   @id @default(uuid())
  columnId      String
  column        Column   @relation(fields: [columnId], references: [id], onDelete: Cascade)
  title         String
  description   String   @default("")
  order         Int      @default(0)
  priority      Priority @default(MEDIUM)
  tags          String   @default("[]") // JSON serialized array of tag strings
  subtasks      String   @default("[]") // JSON serialized array of { id, title, completed }
  dueDate       String?  @default("")
  isBlocked     Boolean  @default(false)
  blockedReason String?  @default("")
  assignee      String?  @default("")
  movedAt       DateTime @default(now()) // Timestamp when card entered column
  createdAt     DateTime @default(now())
  updatedAt     DateTime @updatedAt

  activityLogs  ActivityLog[]

  @@index([columnId, order])
}

model ActivityLog {
  id              String   @id @default(uuid())
  boardId         String
  board           Board    @relation(fields: [boardId], references: [id], onDelete: Cascade)
  ticketId        String?
  ticket          Ticket?  @relation(fields: [ticketId], references: [id], onDelete: Cascade)
  ticketTitle     String   @default("")
  action          String   @default("MOVED") // MOVED, CREATED, BLOCKED, UNBLOCKED, DELETED
  fromColumnTitle String?  @default("")
  toColumnTitle   String?  @default("")
  userName        String   @default("User")
  details         String?  @default("")
  createdAt       DateTime @default(now())

  @@index([boardId, createdAt])
  @@index([ticketId, createdAt])
}