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

use crate::api::response::{ApiErrorResponse, ApiResponse};
use crate::error::AppError;
use crate::models::base_info;
use crate::models::notifications::NotificationDetail;
use crate::service::AppService;
use crate::session::Session;

#[derive(Debug, Deserialize, IntoParams)]
pub struct QueryParams {
    pub unread_only: Option<bool>,
    pub limit: Option<i64>,
    pub offset: Option<i64>,
}

/// List notifications for the current user
#[utoipa::path(
    get,
    path = "/api/v1/notifications",
    tag = "Notifications",
    operation_id = "notificationList",
    params(QueryParams),
    responses(
        (status = 200, description = "Notifications listed successfully", body = ApiResponse<Vec<NotificationDetail>>),
        (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_notifications(
    service: web::Data<AppService>,
    session: Session,
    query: web::Query<QueryParams>,
) -> Result<HttpResponse, AppError> {
    let notifications = service
        .notify
        .list_notifications(
            &session,
            query.unread_only.unwrap_or(false),
            query.limit.unwrap_or(50),
            query.offset.unwrap_or(0),
        )
        .await?;

    let actor_ids: Vec<_> = notifications.iter().filter_map(|n| n.actor_id).collect();
    let workspace_ids: Vec<_> = notifications
        .iter()
        .filter_map(|n| n.workspace_id)
        .collect();
    let repo_ids: Vec<_> = notifications.iter().filter_map(|n| n.repo_id).collect();

    let actors = base_info::resolve_users(&service.ctx.db, &actor_ids).await?;
    let workspaces = base_info::resolve_workspaces(&service.ctx.db, &workspace_ids).await?;
    let repos = base_info::resolve_repos(&service.ctx.db, &repo_ids).await?;

    let details: Vec<NotificationDetail> = notifications
        .into_iter()
        .map(|n| {
            let actor = n.actor_id.and_then(|id| actors.get(&id).cloned());
            let workspace = n.workspace_id.and_then(|id| workspaces.get(&id).cloned());
            let repo = n.repo_id.and_then(|id| repos.get(&id).cloned());
            n.into_detail(actor, workspace, repo)
        })
        .collect();

    Ok(HttpResponse::Ok().json(ApiResponse::new(details)))
}