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 QueryParams {
    /// Maximum number of follows to return (default: 50, max: 100)
    pub limit: Option<i64>,
    /// Number of follows to skip for pagination (default: 0)
    pub offset: Option<i64>,
}

/// List followed users
///
/// Returns a paginated list of users followed by the authenticated user.
/// Requires authentication.
#[utoipa::path(
    get,
    path = "/api/v1/user/follows",
    tag = "User",
    operation_id = "userListFollows",
    params(QueryParams),
    responses(
        (status = 200, description = "Follows listed successfully.", body = ApiResponse<Vec<UserFollow>>),
        (status = 401, description = "Authentication required or session expired", body = ApiErrorResponse),
        (status = 500, description = "Internal server error", body = ApiErrorResponse),
    ),
    security(
        ("session_cookie" = [])
    )
)]
pub async fn list_follows(
    service: web::Data<AppService>,
    session: Session,
    query: web::Query<QueryParams>,
) -> Result<HttpResponse, AppError> {
    let follows = service
        .user
        .user_follows_list(
            &session,
            query.limit.unwrap_or(50),
            query.offset.unwrap_or(0),
        )
        .await?;
    Ok(HttpResponse::Ok().json(ApiResponse::new(follows)))
}