package main

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

type RegisterRequest struct {
	ClientName   string `json:"client_name"`
	RedirectUris string `json:"redirect_uris"`
	Scopes       string `json:"scopes"`
	Website      string `json:"website"`
}

type RegisterResponse struct {
	ClientID     string `json:"client_id"`
	ClientSecret string `json:"client_secret"`
	ID           string `json:"id"`
	Name         string `json:"name"`
	RedirectUri  string `json:"redirect_uri"`
	VapidKey     string `json:"vapid_key"`
	Website      string `json:"website"`
}

func (g *gtsClient) register() error {
	params := RegisterRequest{
		ClientName:   applicationName,
		RedirectUris: redirectUri,
		Scopes:       "read write",
		Website:      applicationWebsite,
	}

	data, err := json.Marshal(params)
	if err != nil {
		return fmt.Errorf("unable to marshal the request body; %w", err)
	}

	requestBody := bytes.NewBuffer(data)

	path := "/api/v1/apps"
	url := g.authentication.Instance + path

	ctx, cancel := context.WithTimeout(context.Background(), g.timeout)
	defer cancel()

	request, err := http.NewRequestWithContext(ctx, http.MethodPost, url, requestBody)
	if err != nil {
		return fmt.Errorf("unable to create the HTTP request; %w", err)
	}

	var registerResponse RegisterResponse

	if err := g.sendRequest(request, &registerResponse); err != nil {
		return fmt.Errorf("received an error after sending the registration request; %w", err)
	}

	g.authentication.ClientID = registerResponse.ClientID
	g.authentication.ClientSecret = registerResponse.ClientSecret

	return nil
}