/*

Copyright 2017 Mikael Berthe

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

*/

package madon

import (

	"encoding/json"

	"fmt"

	"strings"

	"github.com/sendgrid/rest"

)

// UserToken represents a user token as returned by the Mastodon API

type UserToken struct {

	AccessToken string `json:"access_token"`

	CreatedAt   int    `json:"created_at"`

	Scope       string `json:"scope"`

	TokenType   string `json:"token_type"`

}

// LoginBasic does basic user authentication

func (mc *Client) LoginBasic(username, password string, scopes []string) error {

	if mc == nil {

		return ErrUninitializedClient

	}

	if username == "" {

		return fmt.Errorf("missing username")

	}

	if password == "" {

		return fmt.Errorf("missing password")

	}

	hdrs := make(map[string]string)

	opts := make(map[string]string)

	hdrs["User-Agent"] = "madon/" + MadonVersion

	opts["grant_type"] = "password"

	opts["client_id"] = mc.ID

	opts["client_secret"] = mc.Secret

	opts["username"] = username

	opts["password"] = password

	if len(scopes) > 0 {

		opts["scope"] = strings.Join(scopes, " ")

	}

	req := rest.Request{

		BaseURL:     mc.InstanceURL + "/oauth/token",

		Headers:     hdrs,

		QueryParams: opts,

		Method:      rest.Post,

	}

	r, err := restAPI(req)

	if err != nil {

		return err

	}

	var resp UserToken

	err = json.Unmarshal([]byte(r.Body), &resp)

	if err != nil {

		return fmt.Errorf("cannot unmarshal server response: %s", err.Error())

	}

	mc.UserToken = &resp

	return nil

}

// SetUserToken sets an existing user credentials

// No verification of the arguments is made.

func (mc *Client) SetUserToken(token, username, password string, scopes []string) error {

	if mc == nil {

		return ErrUninitializedClient

	}

	mc.UserToken = &UserToken{

		AccessToken: token,

		Scope:       strings.Join(scopes, " "),

		TokenType:   "bearer",

	}

	return nil

}