package ntfy

import (
	"net/url"
	"strings"

	"lazyntfy/internal/config"
)

// Group is a set of topics that share an origin and credentials and can
// therefore share one JSON stream.
type Group struct {
	Origin string
	Names  []string
	Auth   config.Auth
}

// URL is the /json subscription endpoint for this group.
func (g Group) URL(since string) string {
	parts := make([]string, len(g.Names))
	for i, name := range g.Names {
		parts[i] = url.PathEscape(name)
	}
	endpoint := g.Origin + "/" + strings.Join(parts, ",") + "/json"
	if since == "" {
		return endpoint
	}
	q := url.Values{}
	q.Set("since", since)
	return endpoint + "?" + q.Encode()
}

// PublishURL is the POST endpoint for one topic.
func PublishURL(origin, name string) string {
	return origin + "/" + url.PathEscape(name)
}

// GroupSubs buckets subscriptions that can share a connection.
func GroupSubs(subs []config.Sub) []Group {
	var out []Group
	index := map[string]int{}
	for _, sub := range subs {
		key := sub.Origin + "\n" + sub.Auth.Token + "\n" + sub.Auth.User + "\n" + sub.Auth.Password
		if i, ok := index[key]; ok {
			out[i].Names = append(out[i].Names, sub.Name)
			continue
		}
		index[key] = len(out)
		out = append(out, Group{Origin: sub.Origin, Names: []string{sub.Name}, Auth: sub.Auth})
	}
	return out
}