package main

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
)

const (
	atURL = "https://at.hackerspace.pl/api"
)

// atStatus is the result of queruing checkinator/at (Hackerspace presence
// service).
type atStatus struct {
	// Users is the list of present and publicly visible users.
	Users []atUser `json:"users"`
	// ESPs is the number of ESP{8266,32} devices.
	ESPs int `json:"esps"`
	// Kektops is the number of nettop “Kektop” devices.
	Kektops int `json:"kektops"`
	// Unknown is the number of unknown devices in the network.
	Unknown int `json:"unknown"`
}

type atUser struct {
	Login string `json:"login"`
}

func getAt(ctx context.Context) (*atStatus, error) {
	r, err := http.NewRequestWithContext(ctx, "GET", atURL, nil)
	if err != nil {
		return nil, fmt.Errorf("NewRequest(%q): %w", atURL, err)
	}
	res, err := http.DefaultClient.Do(r)
	if err != nil {
		return nil, fmt.Errorf("GET: %w", err)
	}
	defer res.Body.Close()

	var status atStatus
	if err := json.NewDecoder(res.Body).Decode(&status); err != nil {
		return nil, fmt.Errorf("when decoding JSON: %w", err)
	}

	return &status, nil
}