package rest

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

const memberEndpoint = "https://discord.com/api/v9/guilds/%s/members?after=%s"

func Members(guildID, token string) ([]Member, error) {
	var mems []Member

	after := "0"
	for {
		m, err := members(guildID, token, after)
		if err != nil {
			return nil, err
		}
		mems = append(mems, m...)
		if len(mems) < 1000 {
			break
		}
		after = mems[len(mems)-1].User.ID
	}

	return mems, nil
}

func members(guildID, token, after string) ([]Member, error) {
	var members []Member

	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf(memberEndpoint, guildID, after), nil)
	if err != nil {
		return nil, err
	}
	req.Header.Set("Authorization", "Bot "+token)

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if err := json.NewDecoder(resp.Body).Decode(&members); err != nil {
		return nil, err
	}

	return members, nil
}

type Member struct {
	Nick string `json:"nick"`
	User struct {
		ID       string `json:"id"`
		Username string `json:"username"`
	} `json:"user"`
}