use axum::extract::{Query, State};
use axum::routing::get;
use axum::{Json, Router};

use crate::error::AppError;
use crate::models::{ApiResponse, AssetMeta, ListParams, ListResponse, Pagination};
use crate::{db, AppState};

pub fn router() -> Router<AppState> {
    Router::new().route("/api/v1/can/0/list", get(list_assets))
}

/// GET /api/v1/can/0/list - Return a paginated list of assets with their metadata.
/// Supports query params: limit, offset, order (asc/desc), application filter.
async fn list_assets(
    State(state): State<AppState>,
    Query(params): Query<ListParams>,
) -> Result<Json<ApiResponse<ListResponse>>, AppError> {
    let conn = state.db.lock().unwrap();
    let (assets, total) = db::list_assets(&conn, &params)?;

    let items: Vec<AssetMeta> = assets
        .iter()
        .map(|a| db::asset_to_meta(&conn, a))
        .collect::<Result<Vec<_>, _>>()?;

    let response = ListResponse {
        items,
        pagination: Pagination {
            limit: params.limit.unwrap_or(50),
            offset: params.offset.unwrap_or(0),
            total,
        },
    };

    Ok(Json(ApiResponse::success(response)))
}