<?php

namespace Lu\LuStudyCatalogue\Controller;

use Lu\LuApi\DataSources\LuisStudyTypes;
use Lu\LuStudyCatalogue\Helpers\DataHelper;
use TYPO3\CMS\Core\Context\Context;
use TYPO3\CMS\Core\Page\PageRenderer;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;

/**
 * Class CourseController
 *
 * @author  Dainis Abols <dainis.abols@lu.lv>
 * @owner   University of Latvia
 * @version 2.0.0
 * @since   25.07.2018
 *
 * @package Lu\LuCourseCatalogue\Controller
 */
class CourseController extends ActionController
{
    /**
     * Frontend-Session
     *
     * @var \Lu\LuStudyCatalogue\Domain\Session\FrontendSessionHandler
     */
    protected $frontendSession;

    /**
     * Frontend- or Backend-Session
     * The type of session is set automatically in initializeAction().
     *
     * @var \Lu\LuStudyCatalogue\Domain\Session\SessionHandler
     */
    protected $session;

    /**
     * Main language array
     *
     * @var array
     */
    private $language;

    /**
     * Uri Builder object
     *
     * @var \TYPO3\CMS\Extbase\Mvc\Web\Routing\UriBuilder
     */
    private $uri_builder;

    /**
     * Selected page number
     *
     * @var int
     */
    private $currentPage;

    /**
     * Filter array
     *
     * @var array
     */
    private $filter;

    /**
     * Study Course ID
     *
     * @var int
     */
    private $courseId;

    /**
     * Study program ID
     *
     * @var int
     */
    private $programId;

    /**
     * MusicController constructor.
     *
     * Assign page ID
     */
    public function __construct()
    {
        parent::__construct();

        // Disable cache in case of missing chash in URL
        $GLOBALS['TSFE']->set_no_cache();

        // Set language data
        $languageAspect = GeneralUtility::makeInstance(Context::class)->getAspect('language');
        $this->language = [
            'id'   => $languageAspect->getId(),
            'iso'  => $GLOBALS['TSFE']->sys_language_isocode,
            'code' => $GLOBALS['TSFE']->sys_language_isocode == 'lv' ? 'lat' : 'eng',
        ];
    }

    /**
     * List Action
     *
     * @return void
     */
    public function listAction()
    {
        // Pre-define variables
        $data              = [];
        $request           = $this->request->getArguments();
        $this->uri_builder = $this->controllerContext->getUriBuilder()->setCreateAbsoluteUri(true)->reset();

        // Get current page @FIXME There has to be a better way!
        $this->currentPage = !empty($request['@widget_0']['currentPage']) ? (int)$request['@widget_0']['currentPage'] : 1;

        // Add filter options
        if (!empty($request['filter'])) {
            $this->filter = $request['filter'];
        } else {
            $this->filter = [];
        }
        $this->view->assign('filter', $this->filter);

        // Advanced filters with additional values
        $advFilter = [];
        foreach ($this->filter as $key => $item) {
            if (!in_array($key, ['nosaukums_lat', 'nosaukums_eng'])) {
                $advFilter[] = [
                    'id'   => md5($key.'_'.$item),
                    'key'  => $key,
                    'name' => $item,
                ];
            }
        }
        $this->view->assign('advFilter',$advFilter);

        // Switch
        $studyType = @$this->settings['studyType'];
        switch ($studyType) {
            case 'course_catalogue':
                $data['solr'] = $this->listCourse();
                break;
            case 'course_catalogue_continue':
                $data['solr'] = $this->listCourseContinue();
                break;
            case 'program_catalogue':
                $data['solr'] = $this->listProgram();
                break;
            case 'program_catalogue_continue':
                $data['solr'] = $this->listProgramContinue();
                break;
        }

        // Add custom JS
        $this->renderJs();

        // Assign frontend page ID
        $this->view->assign('pageId', $GLOBALS['TSFE']->id);

        // Assign language element to view
        $this->view->assign('language', $this->language);

        // Assign final data element to view
        $this->view->assign('data', $data);
    }

    /**
     * Get route list data
     *
     * @return array
     */
    private function listCourse(): array
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setFullReturn(true);
        $luisStudyTypes->setLimit(!empty($this->settings['list']['paginate']['itemsPerPage']) ? $this->settings['list']['paginate']['itemsPerPage'] : 10);
        $luisStudyTypes->setPage($this->currentPage);
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setFilter($this->filter);
        $luisStudyTypes->setRequestType('courseCatalogue');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Fix facets fields
        $facets = [];
        if ($data['success'] && !empty($data['data'])) {
            foreach ($data['data']['facet_fields'] as $facet_name => $facet_fields) {
                $filter = $this->filter;
                unset($filter[$facet_name]);

                $tmp = [
                    'title'           => str_replace("_".$this->language['code'], "", $facet_name),
                    'data'            => [],
                    'inFilter'        => !empty($this->filter[$facet_name]) ? $this->filter[$facet_name] : false,
                ];
                for ($k = 0; $k < count($facet_fields); $k += 2) {
                    $tmp['data'][] = [
                        'id'    => md5($facet_name.'_'.$facet_fields[$k]),
                        'name'  => $facet_fields[$k],
                    ];
                }
                $facets[] = $tmp;
            }

            $data['data']['facet_fields'] = $facets;

            // Fix language params
            foreach ($data['data']['docs'] as &$item) {
                $item['url'] = $this->uri_builder->reset()->uriFor('detail', ['course' => $item['kods']]);
            }

            // Add paginate object
            $data['data']['paginate'] = [];
            for ($k = 0; $k < $data['data']['numFound']; $k++) {
                $data['data']['paginate'][] = $k;
            }

            return (array)$data['data'];
        }

        // Return empty array, if no data found
        return [
            'error' => $data['data'] ? true : false,
            $data['data'] ?? [],
        ];
    }

    /**
     * Get route list data
     *
     * @return array
     */
    private function listCourseContinue(): array
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setFullReturn(true);
        $luisStudyTypes->setLimit(!empty($this->settings['list']['paginate']['itemsPerPage']) ? $this->settings['list']['paginate']['itemsPerPage'] : 10);
        $luisStudyTypes->setPage($this->currentPage);
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setFilter($this->filter);
        $luisStudyTypes->setRequestType('courseCatalogueContinuing');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Fix facets fields
        $facets = [];
        if ($data['success'] && !empty($data['data'])) {
            foreach ($data['data']['facet_fields'] as $facet_name => $facet_fields) {
                $filter = $this->filter;
                unset($filter[$facet_name]);
                $tmp    = [
                    'title'           => str_replace("_".$this->language['code'], "", $facet_name),
                    'data'            => [],
                    'inFilter'        => !empty($this->filter[$facet_name]) ? $this->filter[$facet_name] : false,
                ];
                for ($k = 0; $k < count($facet_fields); $k += 2) {
                    $tmp['data'][] = [
                        'id'    => md5($facet_name.'_'.$facet_fields[$k]),
                        'name'  => $facet_fields[$k],
                    ];
                }
                $facets[] = $tmp;
            }

            $data['data']['facet_fields'] = $facets;

            // Fix language params
            foreach ($data['data']['docs'] as &$item) {
                $item['url'] = $this->uri_builder->reset()->uriFor('detail', ['course' => $item['kods']]);
            }

            // Add paginate object
            $data['data']['paginate'] = [];
            for ($k = 0; $k < $data['data']['numFound']; $k++) {
                $data['data']['paginate'][] = $k;
            }

            return (array)$data['data'];
        }

        // Return empty array, if no data found
        return [
            'error' => $data['data'] ? true : false,
            $data['data'] ?? [],
        ];
    }

    /**
     * Get route list data
     *
     * @return array
     */
    private function listProgram(): array
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setFullReturn(true);
        $luisStudyTypes->setLimit(!empty($this->settings['list']['paginate']['itemsPerPage']) ? $this->settings['list']['paginate']['itemsPerPage'] : 10);
        $luisStudyTypes->setPage($this->currentPage);
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setFilter($this->filter);
        $luisStudyTypes->setRequestType('programmeCatalogue');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Fix facets fields
        $facets = [];
        if ($data['success'] && !empty($data['data'])) {
            foreach ($data['data']['facet_fields'] as $facet_name => $facet_fields) {
                $filter = $this->filter;
                unset($filter[$facet_name]);
                $tmp    = [
                    'title'           => str_replace("_".$this->language['code'], "", $facet_name),
                    'data'            => [],
                    'inFilter'        => !empty($this->filter[$facet_name]) ? $this->filter[$facet_name] : false,
                ];
                for ($k = 0; $k < count($facet_fields); $k += 2) {
                    $tmp['data'][] = [
                        'id'    => md5($facet_name.'_'.$facet_fields[$k]),
                        'name'  => $facet_fields[$k],
                    ];
                }
                $facets[] = $tmp;
            }

            $data['data']['facet_fields'] = $facets;

            // Fix language params
            foreach ($data['data']['docs'] as &$item) {
                $item['url'] = $this->uri_builder->reset()->uriFor('detail', ['program' => $item['id']]);
            }

            // Add paginate object
            $data['data']['paginate'] = [];
            for ($k = 0; $k < $data['data']['numFound']; $k++) {
                $data['data']['paginate'][] = $k;
            }

            return (array)$data['data'];
        }

        // Return empty array, if no data found
        return [
            'error' => $data['data'] ? true : false,
            $data['data'] ?? [],
        ];
    }

    /**
     * Get route list data
     *
     * @return array
     */
    private function listProgramContinue(): array
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setFullReturn(true);
        $luisStudyTypes->setLimit(!empty($this->settings['list']['paginate']['itemsPerPage']) ? $this->settings['list']['paginate']['itemsPerPage'] : 10);
        $luisStudyTypes->setPage($this->currentPage);
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setFilter($this->filter);
        $luisStudyTypes->setRequestType('programmeCatalogueContinuing');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Fix facets fields
        $facets = [];
        if ($data['success'] && !empty($data['data'])) {
            foreach ($data['data']['facet_fields'] as $facet_name => $facet_fields) {
                $filter = $this->filter;
                unset($filter[$facet_name]);
                $tmp    = [
                    'title'           => str_replace("_".$this->language['code'], "", $facet_name),
                    'data'            => [],
                    'inFilter'        => !empty($this->filter[$facet_name]) ? $this->filter[$facet_name] : false,
                ];
                for ($k = 0; $k < count($facet_fields); $k += 2) {
                    $tmp['data'][] = [
                        'id'    => md5($facet_name.'_'.$facet_fields[$k]),
                        'name'  => $facet_fields[$k],
                    ];
                }

                // Add current facet count, that has content
                foreach ($tmp['data'] as $item) {
                    if ($item['count'] > 0) {
                        $tmp['count']++;
                    }
                }

                $facets[] = $tmp;
            }

            $data['data']['facet_fields'] = $facets;

            // Fix language params
            foreach ($data['data']['docs'] as &$item) {
                $item['url'] = $this->uri_builder->reset()->uriFor('detail', ['program' => $item['id']]);
            }

            // Add paginate object
            $data['data']['paginate'] = [];
            for ($k = 0; $k < $data['data']['numFound']; $k++) {
                $data['data']['paginate'][] = $k;
            }

            return (array)$data['data'];
        }

        // Return empty array, if no data found
        return [
            'error' => $data['data'] ? true : false,
            $data['data'] ?? [],
        ];
    }

    /**
     * Course/program detail view
     */
    public function detailAction()
    {
        // Pre-define variables
        $data              = [];
        $this->uri_builder = $this->controllerContext->getUriBuilder()->setCreateAbsoluteUri(true)->reset();

        // Set course_id
        $this->courseId  = $this->request->hasArgument('course') ? $this->request->getArgument('course') : 0;
        $this->programId = $this->request->hasArgument('program') ? $this->request->getArgument('program') : 0;

        // Switch
        $studyType = @$this->settings['studyType'];
        switch ($studyType) {
            case 'course_catalogue':
                $data['studyUrlUd'] = $this->settings['catalogues']['courseCatalogueId'] ?? null;
                $data['programUrlUd'] = $this->settings['catalogues']['programmeCatalogueId'] ?? null;
                $data['solr'] = $this->detailCourse();
                break;
            case 'program_catalogue':
                $data['studyUrlUd'] = $this->settings['catalogues']['courseCatalogueId'] ?? null;
                $data['programUrlUd'] = $this->settings['catalogues']['programmeCatalogueId'] ?? null;
                $data['solr'] = $this->detailProgram();
                break;
            case 'course_catalogue_continue':
                $data['studyUrlUd'] = $this->settings['catalogues']['courseCatalogueContinuingId'] ?? null;
                $data['programUrlUd'] = $this->settings['catalogues']['programmeCatalogueContinuingId'] ?? null;
                $data['solr'] = $this->detailCourseContinue();
                break;
            case 'program_catalogue_continue':
                $data['studyUrlUd'] = $this->settings['catalogues']['courseCatalogueContinuingId'] ?? null;
                $data['programUrlUd'] = $this->settings['catalogues']['programmeCatalogueContinuingId'] ?? null;
                $data['solr'] = $this->detailProgramContinue();
                break;
        }

        // Make adjustments
        if (!empty($data) && !empty($data['solr'])) {
            foreach ($data['solr'] as $key => $item) {
                // Add fix for `ekursi` f*ckup
                if (!empty($item['ekursi'])) {
                    $tmp = [];
                    @eval('$tmp = '.$item['ekursi'].';');
                    $data['solr'][$key]['ekursi_fix'] = $tmp;
                }

                // Create `prog_nosauk` urls
                if (!empty($item['prog_nosauk'])) {
                    $tmp = [];
                    foreach ($item['prog_nosauk'] as $prog) {
                        $tmpUri = $this->uri_builder->reset();

                        // Check if custom site specified
                        if ($data['programUrlUd']) {
                            $tmpUri->setTargetPageUid($data['programUrlUd']);
                        }

                        // This is strange, but hey, I didn't design it ¯\_(ツ)_/¯
                        list($prog_name, $prog_id) = explode("(*;,)", $prog);
                        $tmp[] = [
                            'name' => $prog_name,
                            'code' => $prog_id,
                            'url'  => $tmpUri->uriFor('detail', ['program' => $prog_id]),
                        ];
                    }
                    $data['solr'][$key]['prog_nosauk_fix'] = $tmp;
                }

                // Add fix for `studforma_info`
                if (!empty($item['studforma_info'])) {
                    $data['solr'][$key]['studforma_info_fix'] = $this->studFormEval($item['studforma_info']);
                }

                // Add fix for `studiju_plans`
                if (!empty($item['studiju_plans'])) {
                    $tmp = [];
                    @eval('$tmp = '.$item['studiju_plans'].';');

                    // Add link to all elements
                    foreach ($tmp as &$course) {
                        if (!empty($course['kursi'])) {
                            $tmpUri = $this->uri_builder->reset();
                            if ($data['studyUrlUd']) {
                                $tmpUri->setTargetPageUid($data['studyUrlUd']);
                            }

                            foreach ($course['kursi'] as &$cour) {
                                $cour['url'] = $tmpUri->uriFor('detail', ['course' => $cour['kods']]);
                            }
                        }
                    }

                    $data['solr'][$key]['studiju_plans_fix'] = $tmp;
                }
            }
        }

        // Override page title
        if (!empty($data['solr'][0]['nosaukums'])) {
            $GLOBALS['LU-OVERRIDES']['MainTitle'] = $data['solr'][0]['nosaukums'];
        }

        // Add custom JS
        $this->renderJs();

        // Assign frontend page ID
        $this->view->assign('pageId', $GLOBALS['TSFE']->id);

        // Assign language element to view
        $this->view->assign('language', $this->language);

        // Assign final data element to view
        $this->view->assign('data', $data);
    }

    /**
     * Get detailed info about a course
     *
     * @return array
     */
    public function detailCourse()
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setCode($this->courseId);
        $luisStudyTypes->setRequestType('detailCourse');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Return result
        return (array)$data;
    }

    /**
     * Get detailed info about a course
     *
     * @return array
     */
    public function detailCourseContinue()
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setCode($this->courseId);
        $luisStudyTypes->setRequestType('detailCourseContinue');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Return result
        return (array)$data;
    }

    /**
     * Get detailed info about a course
     *
     * @return array
     */
    public function detailProgram()
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setCode($this->programId);
        $luisStudyTypes->setRequestType('detailProgram');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Return result
        return (array)$data;
    }

    /**
     * Get detailed info about a course
     *
     * @return array
     */
    public function detailProgramContinue()
    {
        // Pre-set models and values
        $DataHelper     = new DataHelper();
        $luisStudyTypes = new LuisStudyTypes();
        $luisStudyTypes->setLanguageCode($this->language['code']);
        $luisStudyTypes->setCode($this->programId);
        $luisStudyTypes->setRequestType('detailProgramContinue');

        // Fetch data from API endpoint
        $jsonData = $luisStudyTypes->fetch();
        $data     = $DataHelper->APIDecode($jsonData);

        // Return result
        return (array)$data;
    }

    /**
     * Adds our own custom js
     */
    private function renderJs()
    {
        $pageRenderer = GeneralUtility::makeInstance(PageRenderer::class);

        // Add jQuery UI
        $pageRenderer->addCssFile("//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css");
        $pageRenderer->addJsFooterFile("//code.jquery.com/jquery-1.12.4.js");
        $pageRenderer->addJsFooterFile("//code.jquery.com/ui/1.12.1/jquery-ui.js");

        // Add own JS
        $pageRenderer->addJsFooterFile("/typo3conf/ext/lu_study_catalogue/Resources/Public/JavaScript/scripts.js");
    }

    /**
     * Evaluates study form data
     *
     * @param $studforma_info
     *
     * @return array
     */
    private function studFormEval($studforma_info)
    {
        $studyFormsEvaledArray = [];
        foreach ($studforma_info as $studiju_forma_info) {
            //in solr studforma_info is keeped in form of php array definition string, eval it
            if (!empty($studiju_forma_info)) {
                eval('$studiju_formu_info_arr ='.$studiju_forma_info.';');
            } else {
                $studiju_formu_info_arr = [];
            }

            // Get year from
            if (empty($maxSemStudVietuInfo)) {
                $maxSemStudVietuInfo = $this->getYearAndSeasonFromSemester($studiju_formu_info_arr['vietu_semestris_'.$this->language['code']]);
            } else {
                $currentSemester = $this->getYearAndSeasonFromSemester($studiju_formu_info_arr['vietu_semestris_'.$this->language['code']]);
                if ($currentSemester['year'] > $maxSemStudVietuInfo['year']) {
                    $maxSemStudVietuInfo = $currentSemester;
                }
            }

            if (empty($maxSemStudMaksaInfo)) {
                $maxSemStudMaksaInfo = $this->getYearAndSeasonFromSemester($studiju_formu_info_arr['stud_maksas_semestris_'.$this->language['code']]);
            } else {
                $currentSemester = $this->getYearAndSeasonFromSemester($studiju_formu_info_arr['stud_maksas_semestris_'.$this->language['code']]);
                if ($currentSemester['year'] > $maxSemStudMaksaInfo['year']) {
                    $maxSemStudMaksaInfo = $currentSemester;
                }
            }

            // Add to array
            $studiju_formu_info_arr['maxSemStudVietuInfo'] = $maxSemStudVietuInfo;
            $studiju_formu_info_arr['maxSemStudMaksaInfo'] = $maxSemStudMaksaInfo;
            $studiju_formu_info_arr['studFeeSemYear']      = $maxSemStudVietuInfo['year'];
            $studiju_formu_info_arr['studFeeSemSeason']    = $maxSemStudVietuInfo['season'];

            // Rename fields
            $studiju_formu_info_arr['nos']                   = $studiju_formu_info_arr['nos_'.$this->language['code']];
            $studiju_formu_info_arr['vietu_semestris']       = $studiju_formu_info_arr['vietu_semestris_'.$this->language['code']];
            $studiju_formu_info_arr['stud_maksas_semestris'] = $studiju_formu_info_arr['stud_maksas_semestris_'.$this->language['code']];
            $studiju_formu_info_arr['stud_organizacija']     = $studiju_formu_info_arr['stud_organizacija_'.$this->language['code']];
            $studiju_formu_info_arr['uznems_sem_1']          = trim($studiju_formu_info_arr['uznems_sem_1_'.$this->language['code']]);
            $studiju_formu_info_arr['uznems_sem_2']          = trim($studiju_formu_info_arr['uznems_sem_2_'.$this->language['code']]);

            // Assign values
            $studyFormsEvaledArray[] = $studiju_formu_info_arr;
        }

        return $studyFormsEvaledArray;
    }

    /**
     * Recieves year and season from semester data
     *
     * @param $semester
     *
     * @return array
     */
    private function getYearAndSeasonFromSemester($semester)
    {
        $yearAndSeason           = explode('.', $semester);
        if ((int)trim($yearAndSeason[0]) == 0) {
            $yearAndSeason           = explode(' ', $semester);
            if ((int)trim($yearAndSeason[1]) != 0) {
                $yearAndSeason['year']   = (int)trim($yearAndSeason[1]);
                $yearAndSeason['season'] = trim($yearAndSeason[0]);
            }
        } else {
            $yearAndSeason['year']   = (int)trim($yearAndSeason[0]);
            $yearAndSeason['season'] = trim($yearAndSeason[1]);
        }
        unset($yearAndSeason[0]);
        unset($yearAndSeason[1]);

        return $yearAndSeason;
    }
}