use actix_web::{HttpResponse, web};
use serde::Deserialize;
use utoipa::IntoParams;

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::users::UserFollow;
use crate::service::AppService;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct PathParams {
    /// User ID to follow
    pub target_user_id: uuid::Uuid,
}

/// Follow a user
///
/// Starts following the specified user. Requires authentication.
#[utoipa::path(
    post,
    path = "/api/v1/user/follows/{target_user_id}",
    tag = "User",
    operation_id = "userFollowUser",
    params(PathParams),
    responses(
        (status = 201, description = "User followed successfully.", body = ApiResponse<UserFollow>),
        (status = 400, description = "Invalid request (e.g., following yourself)", body = ApiErrorResponse),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 409, description = "Already following this user", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn follow_user(
    service: web::Data<AppService>,
    session: Session,
    path: web::Path<PathParams>,
) -> Result<HttpResponse, AppError> {
    let follow = service
        .user
        .user_follow_create(&session, path.target_user_id)
        .await?;
    Ok(HttpResponse::Created().json(ApiResponse::new(follow)))
}