<?php namespace SocialNorm\StackOverflow;

use SocialNorm\Providers\OAuth2Provider;
use GuzzleHttp\Client as HttpClient;
use SocialNorm\Request;

// https://stackapps.com/apps/oauth/view/12789
// https://api.stackexchange.com/docs/authentication

// This is entirely untested; it might work, but since we don't get e-mail from it,
// it's use as an auth method is problematic.
class StackOverflowProvider extends OAuth2Provider
{
    protected $authorizeUrl = "https://stackoverflow.com/oauth";
    protected $accessTokenUrl = "https://stackoverflow.com/oauth/access_token";
    protected $userDataUrl = "https://api.stackexchange.com/2.2/me";
    protected $scope = [];

	private $key;

    protected $headers = [
        'authorize' => [],
        'access_token' => [
            'Content-Type' => 'application/x-www-form-urlencoded'
        ],
        'user_details' => [],
    ];

	public function __construct(array $config, HttpClient $httpClient, Request $request)
	{
		parent::__construct($config, $httpClient, $request);
		$this->key = $config['key'];
	}

	protected function compileScopes()
    {
        return implode(' ', $this->scope);
    }

    protected function getAuthorizeUrl()
    {
        return $this->authorizeUrl;
    }

    protected function getAccessTokenBaseUrl()
    {
        return $this->accessTokenUrl;
    }

    protected function getUserDataUrl()
    {
        return $this->userDataUrl;
    }

	protected function buildUserDataUrl()
	{
		$url = $this->getUserDataUrl();

		$url .= "?access_token=".$this->accessToken
			. "&site=stackoverflow"
			. "&key=".$this->key;

		return $url;
	}

    protected function parseTokenResponse($response)
    {
        return $this->parseJsonTokenResponse($response);
    }

    protected function parseUserDataResponse($response)
    {
        return json_decode($response, true);
    }

    protected function userId()
    {
        return array_get($this->providerUserData, 'items.0.account_id');
    }

    protected function nickname()
    {
	    return array_get($this->providerUserData, 'items.0.display_name');
    }

    protected function fullName()
    {
	    return array_get($this->providerUserData, 'items.0.display_name');
    }

    protected function avatar()
    {
	    return array_get($this->providerUserData, 'items.0.profile_image');
    }

    protected function email()
    {
        return null;
    }
}