package datasets

import (
	"encoding/json"
	"gis/app"
	"net/http"
)

func listDatasetsRoute(application *app.App) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")

		rows, err := application.Db.Query(application.Ctx, "select id, name from datasets")

		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		defer rows.Close()

		datasets := make([]Dataset, 0)

		for rows.Next() {
			var dataset Dataset
			if err := rows.Scan(&dataset.ID, &dataset.Name); err != nil {
				w.WriteHeader(http.StatusInternalServerError)
				return
			}
			datasets = append(datasets, dataset)
		}

		if err := rows.Err(); err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		err = json.NewEncoder(w).Encode(map[string][]Dataset{"data": datasets})

		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}
	}
}