// SQLite-backed dev persistence (M5.9). The model is stored as a JSON snapshot
// per project + a changelog of applied ops. This is the smallest shape that
// gives us "refresh persists state" without committing to the full
// event-sourced architecture in docs/sync.md (that lands later).
//
// Switch `provider` to "postgresql" + set DATABASE_URL=postgres://… to move
// to a real DB later — schema is portable.

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

datasource db {
  provider = "sqlite"
  url      = "file:./dev.db"
}

model Project {
  id        String   @id
  name      String
  scope     String
  tagline   String
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  snapshots ModelSnapshot[]
  changes   ChangelogEntry[]
  threads   SocratesThread[]
}

model ModelSnapshot {
  id        String   @id @default(cuid())
  projectId String
  version   Int
  json      String   // serialized SysMLModel
  createdAt DateTime @default(now())

  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)

  @@unique([projectId, version])
  @@index([projectId, version])
}

model ChangelogEntry {
  id        String   @id @default(cuid())
  projectId String
  version   Int      // resulting model version after these ops landed
  ops       String   // JSON-encoded ModelOp[]
  reason    String?  // optional human/Socrates-supplied rationale
  createdAt DateTime @default(now())

  project   Project @relation(fields: [projectId], references: [id], onDelete: Cascade)

  @@index([projectId, version])
}

model SocratesThread {
  id              String   @id @default(cuid())
  projectId       String
  /// Model element this thread is anchored to, if any (block id, req id, …).
  anchorElementId String?
  status          String   @default("open") // open | archived | resolved
  title           String?
  createdAt       DateTime @default(now())
  updatedAt       DateTime @updatedAt

  project  Project           @relation(fields: [projectId], references: [id], onDelete: Cascade)
  messages SocratesMessage[]

  @@index([projectId])
}

model SocratesMessage {
  id           String   @id @default(cuid())
  threadId     String
  role         String   // "user" | "assistant"
  /// JSON: { text, options?: [{n,label,sub?}] }
  content      String
  /// Provider + model that produced this turn (assistant turns only).
  provider     String?
  model        String?
  inputTokens  Int?
  outputTokens Int?
  createdAt    DateTime @default(now())

  thread SocratesThread @relation(fields: [threadId], references: [id], onDelete: Cascade)

  @@index([threadId, createdAt])
}