// This is your Prisma schema file,
// learn more about it in the docs: https://pris.ly/d/prisma-schema

// Looking for ways to speed up your queries, or scale easily with your serverless or edge functions?
// Try Prisma Accelerate: https://pris.ly/cli/accelerate-init

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

datasource db {
  provider = "postgresql"
}

model Category {
  id          BigInt   @id @default(autoincrement())
  name        String   @unique @db.VarChar(100)
  description String?

  tickets     Ticket[]

  @@map("categories")
}

model Role {
  id          BigInt   @id @default(autoincrement())
  name        String   @unique @db.VarChar(50)
  description String?

  users       User[]

  @@map("roles")
}

model User {
  id           BigInt   @id @default(autoincrement())
  external_uid String   @unique @db.VarChar(255)
  role_id      BigInt
  is_active    Boolean  @default(true)
  created_at   DateTime @default(now()) @db.Timestamptz

  role                    Role                  @relation(fields: [role_id], references: [id])
  tickets_created         Ticket[]              @relation("CreatedBy")
  tickets_assigned        Ticket[]              @relation("AssignedTo")
  messages                TicketMessage[]
  attachments_uploaded    TicketAttachment[]
  invitations_sent        TicketInvitation[]    @relation("Inviter")
  invitations_received    TicketInvitation[]    @relation("Invitee")
  participants             TicketParticipant[]  @relation("Participant")
  participants_added       TicketParticipant[]  @relation("AddedBy")
  status_history_changed   TicketStatusHistory[]

  @@index([external_uid], name: "idx_users_external_uid")
  @@map("users")
}

model Ticket {
  id                  BigInt    @id @default(autoincrement())
  title               String    @db.VarChar(255)
  description         String?
  status              String    @db.VarChar(30)
  priority            String?   @db.VarChar(30)
  category_id         BigInt?
  created_by_user_id  BigInt
  assigned_to_user_id BigInt?
  created_at          DateTime  @default(now()) @db.Timestamptz
  updated_at          DateTime  @default(now()) @db.Timestamptz
  closed_at           DateTime? @db.Timestamptz
  /// Número de ticket legible para usuarios y APIs públicas (formato: TCK-YYYY-NNNNN). Este identificador se usa en lugar del ID interno en todas las comunicaciones externas.
  ticket_number       String    @unique @db.VarChar(30)

  category            Category?             @relation(fields: [category_id], references: [id])
  created_by          User                  @relation("CreatedBy", fields: [created_by_user_id], references: [id])
  assigned_to         User?                 @relation("AssignedTo", fields: [assigned_to_user_id], references: [id])
  messages            TicketMessage[]
  attachments         TicketAttachment[]
  invitations         TicketInvitation[]
  participants        TicketParticipant[]
  status_history      TicketStatusHistory[]

  @@index([assigned_to_user_id], name: "idx_tickets_assigned_to")
  @@index([created_at], name: "idx_tickets_created_at")
  @@index([created_by_user_id], name: "idx_tickets_created_by")
  @@index([status], name: "idx_tickets_status")
  @@index([ticket_number], name: "idx_tickets_ticket_number")
  @@map("tickets")
}

model TicketMessage {
  id          BigInt   @id @default(autoincrement())
  ticket_id   BigInt
  author_id   BigInt
  message     String
  is_internal Boolean  @default(false)
  created_at  DateTime @default(now()) @db.Timestamptz

  ticket      Ticket             @relation(fields: [ticket_id], references: [id], onDelete: Cascade)
  author      User               @relation(fields: [author_id], references: [id])
  attachments TicketAttachment[]

  @@index([ticket_id], name: "idx_messages_ticket_id")
  @@map("ticket_messages")
}

model TicketAttachment {
  id          BigInt   @id @default(autoincrement())
  ticket_id   BigInt
  message_id  BigInt?
  uploaded_by BigInt
  file_name   String?  @db.VarChar(255)
  file_url    String
  file_size   BigInt?
  created_at  DateTime @default(now()) @db.Timestamptz

  ticket      Ticket         @relation(fields: [ticket_id], references: [id], onDelete: Cascade)
  message     TicketMessage? @relation(fields: [message_id], references: [id])
  uploader    User           @relation(fields: [uploaded_by], references: [id])

  @@map("ticket_attachments")
}

/// Invitaciones pendientes, aceptadas o rechazadas para unirse a un ticket
model TicketInvitation {
  id           BigInt    @id @default(autoincrement())
  ticket_id    BigInt
  inviter_id   BigInt
  invitee_id   BigInt
  /// Estado de la invitación: pending, accepted, rejected, cancelled
  status       String    @default("pending") @db.VarChar(20)
  message      String?
  created_at   DateTime  @default(now()) @db.Timestamptz
  responded_at DateTime? @db.Timestamptz

  ticket       Ticket @relation(fields: [ticket_id], references: [id], onDelete: Cascade)
  inviter      User   @relation("Inviter", fields: [inviter_id], references: [id])
  invitee      User   @relation("Invitee", fields: [invitee_id], references: [id])

  @@unique([ticket_id, invitee_id, status], name: "unique_pending_invitation")
  @@index([created_at], name: "idx_invitations_created_at")
  @@index([invitee_id], name: "idx_invitations_invitee_id")
  @@index([inviter_id], name: "idx_invitations_inviter_id")
  @@index([status], name: "idx_invitations_status")
  @@index([ticket_id], name: "idx_invitations_ticket_id")
  @@map("ticket_invitations")
}

/// Usuarios que tienen acceso a un ticket específico
model TicketParticipant {
  id          BigInt   @id @default(autoincrement())
  ticket_id   BigInt
  user_id     BigInt
  added_by    BigInt
  /// Método de adición: creator, invitation, direct_add, assignment, staff_access
  added_via   String   @db.VarChar(20)
  can_edit    Boolean  @default(false)
  can_comment Boolean  @default(true)
  joined_at   DateTime @default(now()) @db.Timestamptz

  ticket      Ticket @relation(fields: [ticket_id], references: [id], onDelete: Cascade)
  user        User   @relation("Participant", fields: [user_id], references: [id])
  added_by_user User @relation("AddedBy", fields: [added_by], references: [id])

  @@unique([ticket_id, user_id])
  @@index([added_by], name: "idx_participants_added_by")
  @@index([ticket_id], name: "idx_participants_ticket_id")
  @@index([user_id], name: "idx_participants_user_id")
  @@map("ticket_participants")
}

model TicketStatusHistory {
  id          BigInt   @id @default(autoincrement())
  ticket_id   BigInt
  old_status  String?  @db.VarChar(30)
  new_status  String   @db.VarChar(30)
  changed_by  BigInt
  changed_at  DateTime @default(now()) @db.Timestamptz

  ticket      Ticket @relation(fields: [ticket_id], references: [id], onDelete: Cascade)
  changed_by_user User @relation(fields: [changed_by], references: [id])

  @@index([ticket_id], name: "idx_history_ticket_id")
  @@map("ticket_status_history")
}