<?php if (!defined('BASEPATH')) exit('No direct script access allowed');

// TODO 
// Add 'add' / 'edit' functions to be able to add/edit the crons in the cron manager view

class cron extends CI_Controller {
	function __construct() {

		parent::__construct();

		if (ENVIRONMENT == 'maintenance' && $this->session->userdata('user_id') == '') {
			echo "Maintenance Mode is active. Try again later.\n";
			redirect('user/login');
		}

		$this->load->model('cron_model');
	}

	public function index() {

		$this->load->model('user_model');
		if (!$this->user_model->authorize(99)) {
			$this->session->set_flashdata('notice', 'You\'re not allowed to do that!');
			redirect('dashboard');
		}

		$this->load->helper('file');

		$footerData = [];
		$footerData['scripts'] = [
			'assets/js/cronstrue.min.js?' . filemtime(realpath(__DIR__ . "/../../assets/js/cronstrue.min.js")),
			'assets/js/sections/cron.js?' . filemtime(realpath(__DIR__ . "/../../assets/js/sections/cron.js"))
		];

		$data['page_title'] = "Cron Manager";
		$data['crons'] = $this->cron_model->get_crons();

		$this->load->view('interface_assets/header', $data);
		$this->load->view('cron/index');
		$this->load->view('interface_assets/footer', $footerData);
	}

	public function run() {

		// This is the main function, which handles all crons, runs them if enabled and writes the 'next run' timestamp to the database

		// TODO Add an API Key to the cronjob to improve security?

		$crons = $this->cron_model->get_crons();

		$status = 'pending';

		foreach ($crons as $cron) {
			if ($cron->enabled == 1) {

				// calculate the crons expression
				$data = array(
					'expression' => $cron->expression,
					'timeZone' => null
				);
				$this->load->library('CronExpression', $data);
				$cronjob = $this->cronexpression;
				$dt = new DateTime();
				$isdue = $cronjob->isMatching($dt);

				$next_run = $cronjob->getNext();
				$next_run_date = date('Y-m-d H:i:s', $next_run);
				$this->cron_model->set_next_run($cron->id, $next_run_date);

				if ($isdue == true) {
					$isdue_result = 'true';

					// TODO Add log_message level debug here to have logging for the cron manager

					echo "CRON: " . $cron->id . " -> is due: " . $isdue_result . "\n";
					echo "CRON: " . $cron->id . " -> RUNNING...\n";

					$url = base_url() . $cron->function;

					$ch = curl_init();
					curl_setopt($ch, CURLOPT_URL, $url);
					curl_setopt($ch, CURLOPT_HEADER, false);
					curl_setopt($ch, CURLOPT_USERAGENT, 'Wavelog Updater');
					curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
					$crun = curl_exec($ch);
					curl_close($ch);

					if ($crun !== false) {
						echo "CRON: " . $cron->id . " -> CURL Result: " . $crun . "\n";

						$status = 'healthy';

						// TODO Proper testing if '!== false' is enough for all functions. 
						// TODO Make Curl Result available in Cron Manager view?

					} else {
						echo "ERROR: Something went wrong with " . $cron->id . "\n";

						$status = 'failed';

						// TODO Add a flag or some kind of warning for the cron manager view?

					}
				} else {
					$isdue_result = 'false';
					echo "CRON: " . $cron->id . " -> is due: " . $isdue_result . " -> Next Run: " . $next_run_date . "\n";
					$status = 'healthy';
				}

			} else {
				echo 'CRON: ' . $cron->id . " is disabled. skipped..\n";
				$status = 'disabled';

				// Set the next_run timestamp to null to indicate in the view/database that this cron is disabled
				$this->cron_model->set_next_run($cron->id, null);
			}
			$this->cron_model->set_status($cron->id, $status);

			$this->cronexpression = null;
		}
	}

	public function editDialog() {

		$cron_query = $this->cron_model->cron(xss_clean($this->input->post('id', true)));

		$data['cron'] = $cron_query->row();
		$data['page_title'] = "Edit Cronjob";

		$this->load->view('cron/edit', $data);
	}

	public function edit() {
		$this->load->model('user_model');
		if (!$this->user_model->authorize(99)) {
			$this->session->set_flashdata('notice', 'You\'re not allowed to do that!');
			redirect('dashboard');
		}

		$id = xss_clean($this->input->post('id',true));
		$description = xss_clean($this->input->post('description',true));
		$expression = xss_clean($this->input->post('expression',true));
		$enabled = xss_clean($this->input->post('enabled',true));

		$this->cron_model->update_cron($id, $description, $expression, $enabled);

	}

	public function toogleEnableCronSwitch() {

		$id = xss_clean($this->input->post('id',true));
		$cron_enabled = xss_clean($this->input->post('checked',true));

		if ($id ?? '' != '') {
				$this->cron_model->set_cron_enabled($id, $cron_enabled);
				$data['success']=1;
		} else {
			$data['success']=0;
			$data['flashdata']='Not allowed';
		}
		echo json_encode($data);
	}

	public function fetchCrons() {
		$hres=[];
		$result = $this->cron_model->get_crons();

		foreach ($result as $cron) {
			$single = (object) [];
			$single->cron_id = $cron->id;
			$single->cron_description = $cron->description;
			$single->cron_status = $this->cronStatus2html($cron->enabled, $cron->status);
			$single->cron_expression = $this->cronExpression2html($cron->expression);
			$single->cron_last_run = $cron->last_run ?? 'never';
			$single->cron_next_run = ($cron->enabled == '1') ? ($cron->next_run ?? 'calculating..') : 'never';
			$single->cron_edit = $this->cronEdit2html($cron->id);
			$single->cron_enabled = $this->cronEnabled2html($cron->id, $cron->enabled);
			array_push($hres, $single);
		}		
		echo json_encode($hres);
	}

	private function cronStatus2html($enabled, $status) {
		if ($enabled == '1') { 
			if ($status == 'healthy') {
				$htmlret = '<span class="badge text-bg-success">healthy</span>';
			} else {
				$htmlret = '<span class="badge text-bg-warning">'.$status.'</span>';
			}
		} else {
			$htmlret = '<span class="badge text-bg-secondary">disabled</span>';
		}
		return $htmlret;
	}

	private function cronExpression2html($expression) {
		$htmlret = '<code id="humanreadable_tooltip" data-bs-toggle="tooltip">'.$expression.'</code>';
		return $htmlret;
	}

	private function cronEdit2html($id) {
		$htmlret = '<button id="'.$id.'" class="editCron btn btn-outline-primary btn-sm"><i class="fas fa-edit"></i></button>';
		return $htmlret;
	}

	private function cronEnabled2html($id, $enabled) {
		if ($enabled == '1') {
			$checked = 'checked';
		} else {
			$checked = '';
		}
		$htmlret = '<div class="form-check form-switch"><input name="cron_enable_switch" class="form-check-input enableCronSwitch" type="checkbox" role="switch" id="'.$id.'" '.$checked.'></div>';
		return $htmlret;
	}
}