use std::sync::Arc;
use application::testing::{InMemoryUserRepository, StubPasswordHasher};
use application::use_cases::RegisterUser;
use domain::errors::DomainError;

#[tokio::test]
async fn registers_new_user() {
    let repo = Arc::new(InMemoryUserRepository::new());
    let uc = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
    let user = uc.execute("testuser", "test@example.com", "password123").await.unwrap();
    assert_eq!(user.username, "testuser");
    assert_eq!(user.email.as_str(), "test@example.com");
    assert_eq!(repo.all().await.len(), 1);
}

#[tokio::test]
async fn rejects_duplicate_email() {
    let repo = Arc::new(InMemoryUserRepository::new());
    let uc = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
    uc.execute("user1", "test@example.com", "password123").await.unwrap();
    let result = uc.execute("user2", "test@example.com", "different1").await;
    assert!(matches!(result, Err(DomainError::Conflict(_))));
}

#[tokio::test]
async fn rejects_duplicate_username() {
    let repo = Arc::new(InMemoryUserRepository::new());
    let uc = RegisterUser::new(repo.clone(), Arc::new(StubPasswordHasher));
    uc.execute("sameuser", "a@example.com", "password123").await.unwrap();
    let result = uc.execute("sameuser", "b@example.com", "password123").await;
    assert!(matches!(result, Err(DomainError::Conflict(_))));
}

#[tokio::test]
async fn rejects_short_password() {
    let repo = Arc::new(InMemoryUserRepository::new());
    let uc = RegisterUser::new(repo, Arc::new(StubPasswordHasher));
    let result = uc.execute("user", "test@example.com", "short").await;
    assert!(matches!(result, Err(DomainError::Validation(_))));
}

#[tokio::test]
async fn rejects_empty_username() {
    let repo = Arc::new(InMemoryUserRepository::new());
    let uc = RegisterUser::new(repo, Arc::new(StubPasswordHasher));
    let result = uc.execute("", "test@example.com", "password123").await;
    assert!(matches!(result, Err(DomainError::Validation(_))));
}