@startuml architecture
!theme plain
skinparam backgroundColor #FFFFFF
skinparam defaultFontName Arial
skinparam packageStyle rectangle

title The Biergarten App - Vertical Slice Architecture

package "API.Core (thin host)" #E3F2FD {
  [API.Core\nASP.NET Core Web API host] as API
  note right of API
    - Program.cs wiring only
    - MediatR + AddApplicationPart
      per Features.* assembly
    - Swagger/OpenAPI, health checks
    - JWT auth middleware
    - Global exception filter
  end note
}

package "Feature Slices" #F3E5F5 {
  [Features.Auth] as AuthSlice
  [Features.Breweries] as BrewerySlice
  [Features.UserManagement] as UserSlice
  [Features.Emails] as EmailsSlice
  note right of AuthSlice
    Each slice owns its own:
    - Controller (HTTP endpoints)
    - Commands/Queries + Handlers
    - Validators
    - Repository
  end note
  note right of EmailsSlice
    No controller - invoked only
    via MediatR commands sent
    from other slices
  end note
}

package "Shared" #FCE4EC {
  [Shared.Contracts] as SharedContracts
  [Shared.Application] as SharedApp
  note right of SharedApp
    - ValidationBehavior
      (MediatR pipeline)
    - Cross-slice email commands
      (SendRegistrationEmailCommand,
      SendResendConfirmationEmailCommand)
  end note
}

package "Infrastructure Layer" #FFF3E0 {
  [Infrastructure.Sql] as Sql
  [Infrastructure.Jwt] as JWT
  [Infrastructure.PasswordHashing] as PwdHash
  [Infrastructure.Email] as Email
  [Infrastructure.Email.Templates] as EmailTemplates
}

package "Domain Layer" #E8F5E9 {
  [Domain.Entities] as Domain
  [Domain.Exceptions] as DomainExceptions
  note right of Domain
    - UserAccount
    - UserCredential
    - UserVerification
    - BreweryPost
  end note
}

database "SQL Server" {
  [Stored Procedures] as SP
  [Tables] as Tables
}

' Relationships
API ..> AuthSlice : AddApplicationPart\n+ MediatR scan
API ..> BrewerySlice : AddApplicationPart\n+ MediatR scan
API ..> UserSlice : AddApplicationPart\n+ MediatR scan
API ..> EmailsSlice : MediatR scan only\n(no controller)

AuthSlice --> Sql
AuthSlice --> JWT
AuthSlice --> PwdHash
AuthSlice --> SharedContracts
AuthSlice --> SharedApp

BrewerySlice --> Sql
BrewerySlice --> SharedContracts
BrewerySlice --> SharedApp

UserSlice --> Sql
UserSlice --> SharedContracts
UserSlice --> SharedApp

EmailsSlice --> Email
EmailsSlice --> EmailTemplates
EmailsSlice --> SharedApp

' The one cross-slice interaction: a MediatR command contract, not a project reference
AuthSlice ..> SharedApp : sends\nSendRegistrationEmailCommand
EmailsSlice ..> SharedApp : handles\nSendRegistrationEmailCommand

Sql --> SP
Sql --> Domain
SP --> Tables

AuthSlice --> Domain
BrewerySlice --> Domain
UserSlice --> Domain
AuthSlice --> DomainExceptions

' Notes
note left of Sql
  SQL-first approach
  All queries via
  stored procedures
end note

note bottom of AuthSlice
  No Features.* project
  ever references another
  Features.* project directly
end note

@enduml