/*

Copyright 2017 Ollivier Robert

Copyright 2017 Mikael Berthe

Licensed under the MIT license.  Please see the LICENSE file is this directory.

*/

package madon

import (

	"errors"

	"net/url"

	"strings"

	"github.com/sendgrid/rest"

)

type registerApp struct {

	ID           int    `json:"id"`

	ClientID     string `json:"client_id"`

	ClientSecret string `json:"client_secret"`

}

// buildInstanceURL creates the URL from the instance name or cleans up the

// provided URL

func buildInstanceURL(instanceName string) (string, error) {

	if instanceName == "" {

		return "", errors.New("no instance provided")

	}

	instanceURL := instanceName

	if !strings.Contains(instanceURL, "/") {

		instanceURL = "https://" + instanceName

	}

	u, err := url.ParseRequestURI(instanceURL)

	if err != nil {

		return "", err

	}

	u.Path = ""

	u.RawPath = ""

	u.RawQuery = ""

	u.Fragment = ""

	return u.String(), nil

}

// NewApp registers a new application with a given instance

func NewApp(name string, scopes []string, redirectURI, instanceName string) (mc *Client, err error) {

	instanceURL, err := buildInstanceURL(instanceName)

	if err != nil {

		return nil, err

	}

	mc = &Client{

		Name:        name,

		InstanceURL: instanceURL,

		APIBase:     instanceURL + currentAPIPath,

	}

	params := make(apiCallParams)

	params["client_name"] = name

	params["scopes"] = strings.Join(scopes, " ")

	if redirectURI != "" {

		params["redirect_uris"] = redirectURI

	} else {

		params["redirect_uris"] = NoRedirect

	}

	var app registerApp

	if err := mc.apiCall("apps", rest.Post, params, nil, nil, &app); err != nil {

		return nil, err

	}

	mc.ID = app.ClientID

	mc.Secret = app.ClientSecret

	return

}

// RestoreApp recreates an application client with existing secrets

func RestoreApp(name, instanceName, appID, appSecret string, userToken *UserToken) (mc *Client, err error) {

	instanceURL, err := buildInstanceURL(instanceName)

	if err != nil {

		return nil, err

	}

	return &Client{

		Name:        name,

		InstanceURL: instanceURL,

		APIBase:     instanceURL + currentAPIPath,

		ID:          appID,

		Secret:      appSecret,

		UserToken:   userToken,

	}, nil

}