package discord

import (
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"time"

	"github.com/goccy/go-json"
)

const DiscordBaseUrl = "https://discord.com/api/v10"

var (
	ErrUnauthorized = errors.New("discord: got a 401 from discord")
)

type IDiscordClient interface {
	Do(req *http.Request) (*http.Response, error)
	BotAuth(req *http.Request)
	ClientAuth(req *http.Request, accessToken string)
	GetClientID() string
}

type DiscordClient struct {
	Client *http.Client

	BotToken     string
	ClientID     string
	ClientSecret string
}

func NewDiscordClient(clientID, clientSecret, botToken string) *DiscordClient {
	return &DiscordClient{
		ClientID:     clientID,
		ClientSecret: clientSecret,
		BotToken:     botToken,
		Client: &http.Client{
			Timeout: time.Second * 10,
		},
	}
}

func (d *DiscordClient) Do(req *http.Request) (*http.Response, error) {
	return d.Client.Do(req)
}

func (d *DiscordClient) BotAuth(req *http.Request) {
	req.Header.Set("Authorization", fmt.Sprintf("Bot %s", d.BotToken))
}

func (d *DiscordClient) ClientAuth(req *http.Request, accessToken string) {
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", d.BotToken))
}

func NewRequest(method string, path string) *http.Request {
	url, err := url.Parse(fmt.Sprintf("%s%s", DiscordBaseUrl, path))
	if err != nil {
		panic("discord/api: wtf couldnt join a string??")
	}

	req := &http.Request{
		Method: method,
		URL:    url,
		Header: http.Header{},
	}

	req.Header.Set("User-Agent", "Roleypoly (https://roleypoly.com, v4)")

	return req
}

func OutputResponse(resp *http.Response, dst any) error {
	if resp.StatusCode == 401 {
		return ErrUnauthorized
	}

	// TODO: more checks?
	return json.NewDecoder(resp.Body).Decode(dst)
}

func (d *DiscordClient) GetClientID() string {
	return d.ClientID
}