// Prisma schema for the organizer app.
// Learn more: https://pris.ly/d/prisma-schema

generator client {
  provider = "prisma-client"
  output   = "../lib/generated/prisma"
}

datasource db {
  provider = "postgresql"
}

enum Role {
  ADMIN
  USER
  PENDING
}

// How the site handles new sign-ups. See SiteSettings.signupMode.
enum SignupMode {
  // Anyone can sign up and is immediately a USER. Today's behavior.
  OPEN
  // Anyone can sign up, but starts PENDING until an admin approves them
  // (moves them to USER or ADMIN) on the Admin page.
  APPROVED
  // Anyone can sign up, but starts PENDING until they confirm their email.
  // Not implemented yet -- the Admin page exposes this option greyed out.
  CONFIRMED
  // Sign-ups are turned off entirely: no form, no working sign-up action.
  CLOSED
}

model User {
  id           String   @id @default(cuid())
  email        String   @unique
  passwordHash String
  name         String?
  // The very first person to sign up becomes ADMIN regardless of
  // signupMode (the site needs at least one admin to bootstrap). Everyone
  // after that gets USER (signupMode OPEN) or PENDING (APPROVED/CONFIRMED),
  // per SiteSettings.signupMode.
  role         Role     @default(USER)
  createdAt    DateTime @default(now())
  updatedAt    DateTime @updatedAt

  categories Category[]
  projects   Project[] @relation("ProjectOwner")
}

/**
 * An isolated board: its own Categories/Groups/To-Dos, invisible from Home
 * and from every other Project. Sole-owner for now -- `ownerId` is both
 * "who created it" and (for now) the only person with access. When
 * Projects become shared spaces, add a `ProjectMember` join table
 * (projectId, userId, role) and extend the access checks in
 * lib/access.ts to consult it too; `ownerId` stays as the implicit
 * full-access member and doesn't need to change.
 */
model Project {
  id      String @id @default(cuid())
  title   String
  ownerId String

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  owner      User       @relation("ProjectOwner", fields: [ownerId], references: [id], onDelete: Cascade)
  categories Category[]

  @@index([ownerId, createdAt])
}

// Single-row table of site-wide settings. Always has exactly one row, at
// the fixed id below -- read with `findFirst` (falling back to defaults
// when the row doesn't exist yet) and written with `upsert`.
model SiteSettings {
  id         String     @id @default("singleton")
  signupMode SignupMode @default(OPEN)
  updatedAt  DateTime   @updatedAt
}

model Category {
  id    String @id @default(cuid())
  name  String
  order Int
  // Exactly one of these is set: userId for a Home category (personal,
  // outside any project), projectId for a category inside a Project.
  // Enforced by a DB check constraint (see migration) as well as by every
  // access path going through lib/access.ts rather than querying userId
  // or projectId directly.
  userId    String?
  projectId String?

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  user    User?    @relation(fields: [userId], references: [id], onDelete: Cascade)
  project Project? @relation(fields: [projectId], references: [id], onDelete: Cascade)
  groups  Group[]

  @@index([userId, order])
  @@index([projectId, order])
}

model Group {
  id   String @id @default(cuid())
  // Short display title, enforced at <=20 chars in app-level validation too.
  title String @db.VarChar(20)
  // Palette key (see lib/colors.ts) rather than a raw hex value, so the
  // curated palette can be retinted centrally without a data migration.
  color String
  // Position within its Category lane.
  order Int
  // Single evolving markdown document for the group. Not a separate model:
  // it's a 1:1, always-exists field with no independent lifecycle.
  noteContent String @default("") @db.Text
  // Set once a group is archived; archived groups are kept (not deleted)
  // but excluded from the Home board query. Null = active.
  archivedAt  DateTime?

  categoryId String

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  category Category @relation(fields: [categoryId], references: [id], onDelete: Cascade)
  todos    Todo[]

  @@index([categoryId, order])
}

model Todo {
  id        String  @id @default(cuid())
  title     String  @db.VarChar(20)
  details   String? @db.Text
  completed Boolean @default(false)
  // Position within its Group's to-do list.
  order     Int

  groupId String

  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  group Group @relation(fields: [groupId], references: [id], onDelete: Cascade)

  @@index([groupId, order])
}