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

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

/// A Konfi-Castle event; the top-level tenant. One instance manages many KCs.
model Kc {
  id         String   @id @default(cuid())
  name       String
  inviteCode String   @unique
  isActive   Boolean  @default(true)
  createdAt  DateTime @default(now())
  updatedAt  DateTime @updatedAt

  gemeinden     Gemeinde[]
  memberships   Membership[]
  wahlen        Wahl[]
  files         File[]
  channels      ChatChannel[]
  guests        GuestAccount[]
  localUsers    User[]
  teamerInvites TeamerInvite[]
}

/// A local congregation/community participating in one Kc.
model Gemeinde {
  id        String   @id @default(cuid())
  name      String
  kcId      String
  createdAt DateTime @default(now())

  kc            Kc             @relation(fields: [kcId], references: [id], onDelete: Cascade)
  memberships   Membership[]
  guests        GuestAccount[]
  teamerInvites TeamerInvite[]

  @@unique([kcId, name])
}

enum Role {
  LEITUNGSTEAM
  GEMEINDE_VERANTWORTLICHER
  GEMEINDE_TEAMER
}

/// A team member account. Leitungsteam and Gemeinde Verantwortliche are
/// Authentik-backed (`authentikSub` set, `passwordHash` null). Gemeinde
/// Teamer are local accounts created by a Verantwortliche/r (`passwordHash`
/// set, `authentikSub` null, `kcId` set) and, like guests, scoped to one KC.
model User {
  id           String   @id @default(cuid())
  authentikSub String?  @unique
  email        String   @unique
  firstName    String
  lastName     String
  passwordHash String?
  kcId         String?
  createdAt    DateTime @default(now())

  kc                 Kc?               @relation(fields: [kcId], references: [id], onDelete: Cascade)
  memberships        Membership[]
  messages           ChatMessage[]
  chatParticipations ChatParticipant[]
}

/// Scopes a User's role to a specific Kc (and Gemeinde, if applicable).
/// LEITUNGSTEAM memberships apply to all Kcs implicitly and omit gemeindeId.
model Membership {
  id         String   @id @default(cuid())
  userId     String
  kcId       String
  gemeindeId String?
  role       Role
  createdAt  DateTime @default(now())

  user     User      @relation(fields: [userId], references: [id], onDelete: Cascade)
  kc       Kc        @relation(fields: [kcId], references: [id], onDelete: Cascade)
  gemeinde Gemeinde? @relation(fields: [gemeindeId], references: [id], onDelete: Cascade)

  @@unique([userId, kcId, gemeindeId])
}

/// Local, non-Authentik account for Konfis/guests, scoped to one Kc/event.
model GuestAccount {
  id         String   @id @default(cuid())
  kcId       String
  gemeindeId String?
  firstName  String
  lastName   String
  createdAt  DateTime @default(now())

  kc         Kc            @relation(fields: [kcId], references: [id], onDelete: Cascade)
  gemeinde   Gemeinde?     @relation(fields: [gemeindeId], references: [id], onDelete: Cascade)
  messages   ChatMessage[]
  teilnehmer Teilnehmer[]
}

/// Invitation issued by a Gemeinde Verantwortliche/r so new Gemeinde Teamer
/// can self-register a local account for one Gemeinde. A group link leaves
/// `email` null and may be redeemed up to `maxUses` times (null = unlimited);
/// a personal invite pins `email` and defaults to a single use.
model TeamerInvite {
  id              String    @id @default(cuid())
  kcId            String
  gemeindeId      String
  token           String    @unique
  email           String?
  maxUses         Int?
  usedCount       Int       @default(0)
  expiresAt       DateTime?
  revokedAt       DateTime?
  createdByUserId String
  createdAt       DateTime  @default(now())

  kc       Kc       @relation(fields: [kcId], references: [id], onDelete: Cascade)
  gemeinde Gemeinde @relation(fields: [gemeindeId], references: [id], onDelete: Cascade)
}

/// A workshop election, scoped to a Kc; name carries a date key + "Teil".
model Wahl {
  id               String   @id @default(cuid())
  kcId             String
  name             String
  datumsSchluessel String
  teil             String
  isOpen           Boolean  @default(true)
  createdAt        DateTime @default(now())

  kc               Kc               @relation(fields: [kcId], references: [id], onDelete: Cascade)
  workshops        Workshop[]
  teilnehmer       Teilnehmer[]
  forceZuteilungen ForceZuteilung[]
}

model Workshop {
  id            String @id @default(cuid())
  wahlId        String
  name          String
  kapazitaet    Int
  minTeilnehmer Int    @default(0)

  wahl             Wahl             @relation(fields: [wahlId], references: [id], onDelete: Cascade)
  zuteilungen      Zuteilung[]
  forceZuteilungen ForceZuteilung[]
}

/// A participant's submitted choices for a Wahl.
model Teilnehmer {
  id             String   @id @default(cuid())
  wahlId         String
  guestAccountId String
  prioritaeten   Json
  createdAt      DateTime @default(now())

  wahl           Wahl            @relation(fields: [wahlId], references: [id], onDelete: Cascade)
  guestAccount   GuestAccount    @relation(fields: [guestAccountId], references: [id], onDelete: Cascade)
  zuteilung      Zuteilung?
  forceZuteilung ForceZuteilung?

  @@unique([wahlId, guestAccountId])
}

/// Manual override set by LT before running the assignment algorithm; takes precedence.
model ForceZuteilung {
  id           String @id @default(cuid())
  wahlId       String
  teilnehmerId String @unique
  workshopId   String

  wahl       Wahl       @relation(fields: [wahlId], references: [id], onDelete: Cascade)
  teilnehmer Teilnehmer @relation(fields: [teilnehmerId], references: [id], onDelete: Cascade)
  workshop   Workshop   @relation(fields: [workshopId], references: [id], onDelete: Cascade)
}

/// Result of the assignment algorithm for one Teilnehmer; workshopId is null if unassigned (no capacity left).
model Zuteilung {
  id           String   @id @default(cuid())
  teilnehmerId String   @unique
  workshopId   String?
  wunschRang   Int      @default(-1)
  isForced     Boolean  @default(false)
  createdAt    DateTime @default(now())

  teilnehmer Teilnehmer @relation(fields: [teilnehmerId], references: [id], onDelete: Cascade)
  workshop   Workshop?  @relation(fields: [workshopId], references: [id], onDelete: SetNull)
}

enum FileVisibility {
  ALLE
  ALLE_AUSSER_KONFIS
  NUR_LT
}

model File {
  id           String         @id @default(cuid())
  kcId         String
  storageKey   String
  filename     String
  visibility   FileVisibility
  uploadedById String
  createdAt    DateTime       @default(now())

  kc Kc @relation(fields: [kcId], references: [id], onDelete: Cascade)
}

enum ChatChannelType {
  GEMEINDE_GRUPPE
  DIREKT
  LT_UEBERGREIFEND
  BROADCAST
}

model ChatChannel {
  id         String          @id @default(cuid())
  kcId       String
  type       ChatChannelType
  gemeindeId String?
  createdAt  DateTime        @default(now())

  kc           Kc                @relation(fields: [kcId], references: [id], onDelete: Cascade)
  messages     ChatMessage[]
  participants ChatParticipant[]
}

/// Explicit membership for DIREKT (1:1) channels; other channel types derive
/// access from Membership/Gemeinde instead of this table.
model ChatParticipant {
  id        String   @id @default(cuid())
  channelId String
  userId    String
  createdAt DateTime @default(now())

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

  @@unique([channelId, userId])
}

model ChatMessage {
  id            String   @id @default(cuid())
  channelId     String
  senderUserId  String?
  senderGuestId String?
  body          String
  createdAt     DateTime @default(now())

  channel     ChatChannel   @relation(fields: [channelId], references: [id], onDelete: Cascade)
  senderUser  User?         @relation(fields: [senderUserId], references: [id])
  senderGuest GuestAccount? @relation(fields: [senderGuestId], references: [id])
}

enum SyncOperation {
  CREATE
  UPDATE
  DELETE
}

/// Append-only log of local mutations, replicated to the peer server (local
/// <-> cloud). `originId` is the SERVER_ID that made the change, so applying
/// an incoming entry never gets re-captured/re-pushed back (no echo loops).
model SyncLogEntry {
  id        String        @id @default(cuid())
  sequence  Int           @default(autoincrement())
  model     String
  recordId  String
  operation SyncOperation
  payload   Json
  originId  String
  createdAt DateTime      @default(now())
}

/// Per-peer replication progress, kept on the side that initiates sync
/// (normally the local, on-site server, since it can always dial out to the
/// cloud even when the cloud can't reach into the event's local network).
model SyncCursor {
  id                 String @id @default(cuid())
  peerId             String @unique
  lastPushedSequence Int    @default(0)
  lastPulledSequence Int    @default(0)
}