<?php

namespace Intuit;

use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

use Intuit\Models\ProviderToken;
use Intuit\Response\{Customer,ListList};

final class API
{
	// https://developer.intuit.com/app/developer/qbo/docs/learn/rest-api-features
	// @todo implement wait - will get 429 when throttling occurs, wait 60s
	// @todo 500 requests/min per realm
	// @todo requests that take 120s will timeout
	// @todo max entities is 1000, use pagination for more
	private const LOGKEY = 'API';
	private const CACHE_TIME = 60*60*12;
	private const VERSION = 'v3';
	private const MINOR_VERSION = 65;
	private const CURLOPT_HEADER = FALSE;

	private ProviderToken $token;

	public function __construct(ProviderToken $token,bool $tryprod=FALSE)
	{
		$this->url = (config('app.env') == 'local' && ! $tryprod) ? 'https://sandbox-quickbooks.api.intuit.com' : 'https://quickbooks.api.intuit.com';
		$this->token = $token;

		Log::debug(sprintf('%s:Intuit API for id [%s]',static::LOGKEY,$token->realm_id));
	}

	/* STATIC */

	public static function url(bool $tryprod=FALSE): string
	{
		return (config('app.env') == 'local' && ! $tryprod) ? 'https://app.sandbox.qbo.intuit.com/app' : 'https://app.qbo.intuit.com/app';
	}

	/**
	 * Convert an Array to Curl Headers
	 *
	 * @param array $header
	 * @return array Curl Headers
	 */
	private function convertHeaders(array $header): array
	{
		return collect($header)
			->map(function($value,$key) { return sprintf('%s:%s',$key,$value); })
			->values()
			->toArray();
	}

	/**
	 * Call the API
	 *
	 * @param string $path
	 * @param array $parameters
	 * @return object|array
	 * @throws \Exception
	 */
	private function execute(string $path,array $parameters=[])
	{
		$url = sprintf('%s/%s/company/%s/%s',$this->url,self::VERSION,$this->token->realm_id,$path);

		$method = Arr::get($parameters,'method','GET');

		if ($parameters)
			Arr::forget($parameters,'method');

		// If we are passed an array, we'll do a normal post.
		switch ($method) {
			case 'GET':
				$request = $this->prepareRequest(
					$url,
					$parameters,
					[
						'Accept' => 'application/json',
						'Authorization' => sprintf('Bearer %s',$this->token->access_token),
						'Content-Type' => 'application/json',
					]
				);
				break;

			case 'POST':
				$request = $this->prepareRequestPost(
					$url,
					$parameters,
					[
						'Accept' => 'application/json',
						'Authorization' => sprintf('Bearer %s',$this->token->access_token),
						'Content-Type' => 'application/json',
					]
				);
				break;

			/*
			case 'PUT':
				$request = $this->prepareRequestPut(
					$url,
					$parameters,
					[
						'accept: application/json',
						'Api-Request-Id: '.$request_id,
						'Api-Signature: '.$signature,
					]
				);
				break;
			*/

			default:
				throw new \Exception(sprintf('Unknown method: %s',$method));
		}

		$key = md5($path.serialize($parameters));

		//Cache::forget($key);
		$result = Cache::remember($key,self::CACHE_TIME,function() use ($request,$url) {
			try {
				$response = curl_exec($request);

				switch($x=curl_getinfo($request,CURLINFO_HTTP_CODE)) {
					case 400:
					case 401:
					case 403:
					case 404:
						dump([$xx=curl_getinfo($request),'response'=>$response]);

						throw new \Exception(sprintf('CURL exec returned %d: %s (%s)',$x,curl_error($request),serialize($xx)));
				}

				curl_close($request);
				return json_decode(self::CURLOPT_HEADER ? substr($response,curl_getinfo($request,CURLINFO_HEADER_SIZE)) : $response);

			} catch (\Exception $e) {
				dump(['error'=>$e->getMessage()]);
				Log::error(sprintf('%s:Got an error while posting to [%s] (%s)',static::LOGKEY,$url,$e->getMessage()),['m'=>__METHOD__]);

				curl_close($request);
				throw new \Exception($e->getMessage());
			}
		});

		return $result;
	}

	/**
	 * Get a specific customer record
	 *
	 * @param int $id
	 * @param array $parameters
	 * @return Customer
	 * @throws \Exception
	 */
	public function getCustomer(int $id,array $parameters=[]): Customer
	{
		Log::debug(sprintf('%s:Get a specific customer [%d]',static::LOGKEY,$id));

		return new Customer($this->execute('customer/'.$id,$parameters));
	}

	/**
	 * Get a list of our clients
	 *
	 * @param array $parameters
	 * @return ListList
	 * @throws \Exception
	 */
	public function getCustomers(array $parameters=[]): ListList
	{
		Log::debug(sprintf('%s:Get a list of customers',static::LOGKEY));
		$key = 'customers';
		$parameters['query'] = 'select * from Customer';

		return new ListList($this->execute('query',$parameters),$key);
	}

	/**
	 * Get a list of our invoices
	 *
	 * @param array $parameters
	 * @return ListList
	 * @throws \Exception
	 */
	public function getInvoices(array $parameters=[]): ListList
	{
		Log::debug(sprintf('%s:Get a list of invoices',static::LOGKEY));
		$key = 'invoices';
		$parameters['query'] = 'select * from Invoice';

		return new ListList($this->execute('query',$parameters),$key);
	}

	/**
	 * Setup the API call
	 *
	 * @param        $url
	 * @param array $parameters
	 * @param array $headers
	 * @return \CurlHandle
	 */
	private function prepareRequest(string $url,array $parameters=[],array $headers=[]): \CurlHandle
	{
		$request = curl_init();

		curl_setopt($request,CURLOPT_HEADER,self::CURLOPT_HEADER);		// debugging set this to TRUE, but it affects our body.

		curl_setopt($request,CURLOPT_URL,$url.'?'.http_build_query(array_merge($parameters,['minorversion'=>self::MINOR_VERSION])));
		curl_setopt($request,CURLOPT_RETURNTRANSFER,TRUE);
		curl_setopt($request,CURLOPT_CUSTOMREQUEST,'GET');
		curl_setopt($request,CURLINFO_HEADER_OUT,TRUE);
		curl_setopt($request,CURLOPT_SSL_VERIFYPEER,TRUE);
		curl_setopt($request,CURLOPT_CONNECTTIMEOUT,15);
		curl_setopt($request,CURLOPT_TIMEOUT,15);

		if ($headers)
			curl_setopt($request,CURLOPT_HTTPHEADER,$this->convertHeaders($headers));

		return $request;
	}

	private function prepareRequestPost(string $url,array $parameters=[],array $headers=[]): \CurlHandle
	{
		$request = $this->prepareRequest($url,$parameters,$headers);

		curl_setopt($request,CURLOPT_CUSTOMREQUEST,'POST');
		curl_setopt($request,CURLOPT_POSTFIELDS,json_encode($parameters));

		return $request;
	}

	/**
	 * Update a customer
	 *
	 * @param array $parameters
	 * @return Customer
	 * @throws \Exception
	 */
	public function updateCustomer(array $parameters=[]): Customer
	{
		Log::debug(sprintf('%s:Update customer',static::LOGKEY),['params'=>$parameters]);

		return new Customer($this->execute('customer',array_merge($parameters,['method'=>'POST'])));
	}
}