<?php
namespace admin\Controllers;

use Domain\Languages\LanguagesRepository;
use admin\ViewModels\Forms\FormAction;
use admin\ViewModels\Forms\FormEditViewModel;
use admin\ViewModels\Forms\FormField;
use admin\Support\Forms\FormRequestHandler;

class LanguagesController
{
    private LanguagesRepository $repository;
    private FormRequestHandler $formHandler;

    public function __construct(LanguagesRepository $repository)
    {
        $this->repository = $repository;
        $this->formHandler = new FormRequestHandler();
    }

    public function list(): string
    {
        $sortableColumns = ['o', 'name', 'status', 'start'];

        $filterDefinitions = [
            [
                'key' => 'name',
                'label' => 'Jezyk',
                'type' => 'text',
            ],
            [
                'key' => 'status',
                'label' => 'Aktywny',
                'type' => 'select',
                'options' => [
                    '' => '- aktywny -',
                    '1' => 'tak',
                    '0' => 'nie',
                ],
            ],
            [
                'key' => 'start',
                'label' => 'Domyslny',
                'type' => 'select',
                'options' => [
                    '' => '- domyslny -',
                    '1' => 'tak',
                    '0' => 'nie',
                ],
            ],
        ];

        $listRequest = \admin\Support\TableListRequestFactory::fromRequest(
            $filterDefinitions,
            $sortableColumns,
            'o'
        );

        $sortDir = $listRequest['sortDir'];
        if (trim((string)\S::get('sort')) === '') {
            $sortDir = 'ASC';
        }

        $result = $this->repository->listForAdmin(
            $listRequest['filters'],
            $listRequest['sortColumn'],
            $sortDir,
            $listRequest['page'],
            $listRequest['perPage']
        );

        $rows = [];
        $lp = ($listRequest['page'] - 1) * $listRequest['perPage'] + 1;
        foreach ($result['items'] as $item) {
            $id = (string)($item['id'] ?? '');
            $name = trim((string)($item['name'] ?? ''));

            $rows[] = [
                'lp' => $lp++ . '.',
                'start' => ((int)($item['start'] ?? 0) === 1) ? '<span class="text-system">tak</span>' : 'nie',
                'status' => ((int)($item['status'] ?? 0) === 1) ? 'tak' : '<span style="color: #FF0000;">nie</span>',
                'name' => '<a href="/admin/languages/language_edit/id=' . $id . '">' . htmlspecialchars($name, ENT_QUOTES, 'UTF-8') . '</a>',
                '_actions' => [
                    [
                        'label' => 'Edytuj',
                        'url' => '/admin/languages/language_edit/id=' . $id,
                        'class' => 'btn btn-xs btn-primary',
                    ],
                    [
                        'label' => 'Usun',
                        'url' => '/admin/languages/language_delete/id=' . $id,
                        'class' => 'btn btn-xs btn-danger',
                        'confirm' => 'Na pewno chcesz usunac wybrany jezyk?',
                    ],
                ],
            ];
        }

        $total = (int)$result['total'];
        $totalPages = max(1, (int)ceil($total / $listRequest['perPage']));

        $viewModel = new \admin\ViewModels\Common\PaginatedTableViewModel(
            [
                ['key' => 'lp', 'label' => 'Lp.', 'class' => 'text-center', 'sortable' => false],
                ['key' => 'start', 'sort_key' => 'start', 'label' => 'Domyslny', 'class' => 'text-center', 'sortable' => true, 'raw' => true],
                ['key' => 'status', 'sort_key' => 'status', 'label' => 'Aktywny', 'class' => 'text-center', 'sortable' => true, 'raw' => true],
                ['key' => 'name', 'sort_key' => 'name', 'label' => 'Jezyk', 'sortable' => true, 'raw' => true],
            ],
            $rows,
            $listRequest['viewFilters'],
            [
                'column' => $listRequest['sortColumn'],
                'dir' => $sortDir,
            ],
            [
                'page' => $listRequest['page'],
                'per_page' => $listRequest['perPage'],
                'total' => $total,
                'total_pages' => $totalPages,
            ],
            array_merge($listRequest['queryFilters'], [
                'sort' => $listRequest['sortColumn'],
                'dir' => $sortDir,
                'per_page' => $listRequest['perPage'],
            ]),
            $listRequest['perPageOptions'],
            $sortableColumns,
            '/admin/languages/view_list/',
            'Brak danych w tabeli.',
            '/admin/languages/language_edit/',
            'Dodaj jezyk'
        );

        return \Tpl::view('languages/languages-list', [
            'viewModel' => $viewModel,
        ]);
    }

    public function view_list(): string
    {
        return $this->list();
    }

    public function language_edit(): string
    {
        $languageId = trim((string)\S::get('id'));
        $language = $this->repository->languageDetails($languageId) ?? [];
        $validationErrors = $_SESSION['form_errors'][$this->getLanguageFormId()] ?? null;
        if ($validationErrors) {
            unset($_SESSION['form_errors'][$this->getLanguageFormId()]);
        }

        return \Tpl::view('languages/language-edit', [
            'form' => $this->buildLanguageFormViewModel($language, $this->repository->maxOrder(), $validationErrors),
        ]);
    }

    public function language_save(): void
    {
        $legacyValues = \S::get('values');
        if ($legacyValues) {
            $values = json_decode((string)$legacyValues, true);
            $response = ['status' => 'error', 'msg' => 'Podczas zapisywania jezyka wystapil blad.'];

            if (is_array($values)) {
                $savedId = $this->repository->saveLanguage(
                    (string)($values['id'] ?? ''),
                    (string)($values['name'] ?? ''),
                    $values['status'] ?? 0,
                    $values['start'] ?? 0,
                    (int)($values['o'] ?? 0)
                );
                if ($savedId) {
                    $response = ['status' => 'ok', 'msg' => 'Jezyk zostal zapisany.', 'id' => $savedId];
                }
            }

            echo json_encode($response);
            exit;
        }

        $languageId = trim((string)\S::get('id'));
        $language = $this->repository->languageDetails($languageId) ?? [];
        $viewModel = $this->buildLanguageFormViewModel($language, $this->repository->maxOrder());

        $result = $this->formHandler->handleSubmit($viewModel, $_POST);
        if (!$result['success']) {
            $_SESSION['form_errors'][$this->getLanguageFormId()] = $result['errors'];
            echo json_encode(['success' => false, 'errors' => $result['errors']]);
            exit;
        }

        $data = $result['data'];
        $requestId = strtolower(trim((string)\S::get('id')));
        $idFromData = strtolower(trim((string)($data['id'] ?? '')));
        $id = $idFromData !== '' ? $idFromData : $requestId;
        if (!preg_match('/^[a-z]{2}$/', $id)) {
            echo json_encode([
                'success' => false,
                'errors' => ['id' => 'ID jezyka musi miec 2 litery (np. pl, en).'],
            ]);
            exit;
        }

        $savedId = $this->repository->saveLanguage(
            $id,
            trim((string)($data['name'] ?? '')),
            $data['status'] ?? 0,
            $data['start'] ?? 0,
            (int)($data['o'] ?? 0)
        );

        if ($savedId) {
            echo json_encode([
                'success' => true,
                'id' => $savedId,
                'message' => 'Jezyk zostal zapisany.',
            ]);
            exit;
        }

        echo json_encode([
            'success' => false,
            'errors' => ['general' => 'Podczas zapisywania jezyka wystapil blad.'],
        ]);
        exit;
    }

    public function language_delete(): void
    {
        if ($this->repository->deleteLanguage((string)\S::get('id'))) {
            \S::alert('Jezyk zostal usuniety.');
        }

        header('Location: /admin/languages/view_list/');
        exit;
    }

    public function translation_list(): string
    {
        $sortableColumns = ['text', 'id'];
        $filterDefinitions = [
            [
                'key' => 'text',
                'label' => 'Tekst',
                'type' => 'text',
            ],
        ];

        $listRequest = \admin\Support\TableListRequestFactory::fromRequest(
            $filterDefinitions,
            $sortableColumns,
            'text'
        );

        $sortDir = $listRequest['sortDir'];
        if (trim((string)\S::get('sort')) === '') {
            $sortDir = 'ASC';
        }

        $result = $this->repository->listTranslationsForAdmin(
            $listRequest['filters'],
            $listRequest['sortColumn'],
            $sortDir,
            $listRequest['page'],
            $listRequest['perPage']
        );

        $rows = [];
        $lp = ($listRequest['page'] - 1) * $listRequest['perPage'] + 1;
        foreach ($result['items'] as $item) {
            $id = (int)($item['id'] ?? 0);
            $text = trim((string)($item['text'] ?? ''));

            $rows[] = [
                'lp' => $lp++ . '.',
                'text' => '<a href="/admin/languages/translation_edit/id=' . $id . '">' . htmlspecialchars($text, ENT_QUOTES, 'UTF-8') . '</a>',
                '_actions' => [
                    [
                        'label' => 'Edytuj',
                        'url' => '/admin/languages/translation_edit/id=' . $id,
                        'class' => 'btn btn-xs btn-primary',
                    ],
                    [
                        'label' => 'Usun',
                        'url' => '/admin/languages/translation_delete/id=' . $id,
                        'class' => 'btn btn-xs btn-danger',
                        'confirm' => 'Na pewno chcesz usunac wybrane tlumaczenie?',
                    ],
                ],
            ];
        }

        $total = (int)$result['total'];
        $totalPages = max(1, (int)ceil($total / $listRequest['perPage']));

        $viewModel = new \admin\ViewModels\Common\PaginatedTableViewModel(
            [
                ['key' => 'lp', 'label' => 'Lp.', 'class' => 'text-center', 'sortable' => false],
                ['key' => 'text', 'sort_key' => 'text', 'label' => 'Tekst', 'sortable' => true, 'raw' => true],
            ],
            $rows,
            $listRequest['viewFilters'],
            [
                'column' => $listRequest['sortColumn'],
                'dir' => $sortDir,
            ],
            [
                'page' => $listRequest['page'],
                'per_page' => $listRequest['perPage'],
                'total' => $total,
                'total_pages' => $totalPages,
            ],
            array_merge($listRequest['queryFilters'], [
                'sort' => $listRequest['sortColumn'],
                'dir' => $sortDir,
                'per_page' => $listRequest['perPage'],
            ]),
            $listRequest['perPageOptions'],
            $sortableColumns,
            '/admin/languages/translation_list/',
            'Brak danych w tabeli.',
            '/admin/languages/translation_edit/',
            'Dodaj tlumaczenie'
        );

        return \Tpl::view('languages/translations-list', [
            'viewModel' => $viewModel,
        ]);
    }

    public function translation_edit(): string
    {
        $translationId = (int)\S::get('id');
        $translation = $this->repository->translationDetails($translationId) ?? [];
        $languages = $this->repository->languagesList();
        $validationErrors = $_SESSION['form_errors'][$this->getTranslationFormId()] ?? null;
        if ($validationErrors) {
            unset($_SESSION['form_errors'][$this->getTranslationFormId()]);
        }

        return \Tpl::view('languages/translation-edit', [
            'form' => $this->buildTranslationFormViewModel($translation, $languages, $validationErrors),
        ]);
    }

    public function translation_save(): void
    {
        $legacyValues = \S::get('values');
        if ($legacyValues) {
            $values = json_decode((string)$legacyValues, true);
            $response = ['status' => 'error', 'msg' => 'Podczas zapisywania tlumaczenia wystapil blad.'];

            if (is_array($values)) {
                $languagesMap = $this->extractLegacyTranslations($values, $this->repository->languagesList());
                $savedId = $this->repository->saveTranslation(
                    (int)($values['id'] ?? 0),
                    (string)($values['text'] ?? ''),
                    $languagesMap
                );
                if ($savedId) {
                    $this->clearLanguageSessions($this->repository->languagesList());
                    $response = ['status' => 'ok', 'msg' => 'Tlumaczenie zostalo zapisane.', 'id' => $savedId];
                }
            }

            echo json_encode($response);
            exit;
        }

        $translationId = (int)\S::get('id');
        $translation = $this->repository->translationDetails($translationId) ?? [];
        $languages = $this->repository->languagesList();
        $viewModel = $this->buildTranslationFormViewModel($translation, $languages);

        $result = $this->formHandler->handleSubmit($viewModel, $_POST);
        if (!$result['success']) {
            $_SESSION['form_errors'][$this->getTranslationFormId()] = $result['errors'];
            echo json_encode(['success' => false, 'errors' => $result['errors']]);
            exit;
        }

        $data = $result['data'];
        $languagesMap = [];
        foreach ($languages as $language) {
            $langId = (string)($language['id'] ?? '');
            $key = 'lang_' . $langId;
            $languagesMap[$langId] = (string)($data[$key] ?? '');
        }

        $savedId = $this->repository->saveTranslation(
            $translationId,
            (string)($data['text'] ?? ''),
            $languagesMap
        );

        if ($savedId) {
            $this->clearLanguageSessions($languages);
            echo json_encode([
                'success' => true,
                'id' => $savedId,
                'message' => 'Tlumaczenie zostalo zapisane.',
            ]);
            exit;
        }

        echo json_encode([
            'success' => false,
            'errors' => ['general' => 'Podczas zapisywania tlumaczenia wystapil blad.'],
        ]);
        exit;
    }

    public function translation_delete(): void
    {
        if ($this->repository->deleteTranslation((int)\S::get('id'))) {
            \S::alert('Tlumaczenie zostalo usuniete.');
        }

        header('Location: /admin/languages/translation_list/');
        exit;
    }

    private function buildLanguageFormViewModel(array $language, int $maxOrder, ?array $errors = null): FormEditViewModel
    {
        $languageId = strtolower(trim((string)($language['id'] ?? '')));
        $isNew = $languageId === '';

        $data = [
            'id' => $languageId,
            'name' => (string)($language['name'] ?? ''),
            'status' => (int)($language['status'] ?? 0),
            'start' => (int)($language['start'] ?? 0),
            'o' => (int)($language['o'] ?? ($maxOrder + 1)),
        ];

        $fields = [];
        if ($isNew) {
            $fields[] = FormField::text('id', [
                'label' => 'ID (2 znaki)',
                'required' => true,
                'attributes' => ['maxlength' => 2],
            ]);
        }

        $fields[] = FormField::text('name', [
            'label' => 'Jezyk',
            'required' => true,
        ]);
        $fields[] = FormField::switch('status', [
            'label' => 'Aktywny',
        ]);
        $fields[] = FormField::switch('start', [
            'label' => 'Domyslny',
        ]);
        $fields[] = FormField::hidden('o', $data['o']);

        $actionUrl = '/admin/languages/language_save/' . ($isNew ? '' : ('id=' . $languageId));
        $actions = [
            FormAction::save($actionUrl, '/admin/languages/view_list/'),
            FormAction::cancel('/admin/languages/view_list/'),
        ];

        return new FormEditViewModel(
            $this->getLanguageFormId(),
            $isNew ? 'Nowy jezyk' : 'Edycja jezyka',
            $data,
            $fields,
            [],
            $actions,
            'POST',
            $actionUrl,
            '/admin/languages/view_list/',
            true,
            $isNew ? [] : ['id' => $languageId],
            null,
            $errors
        );
    }

    private function buildTranslationFormViewModel(array $translation, array $languages, ?array $errors = null): FormEditViewModel
    {
        $translationId = (int)($translation['id'] ?? 0);
        $isNew = $translationId <= 0;

        $data = [
            'id' => $translationId,
            'text' => (string)($translation['text'] ?? ''),
        ];

        $fields = [
            FormField::text('text', [
                'label' => 'Tekst',
                'required' => true,
            ]),
        ];

        foreach ($languages as $language) {
            $langId = (string)($language['id'] ?? '');
            $fieldName = 'lang_' . $langId;
            $data[$fieldName] = (string)($translation[$langId] ?? '');
            $fields[] = FormField::text($fieldName, [
                'label' => (string)($language['name'] ?? $langId),
            ]);
        }

        $actionUrl = '/admin/languages/translation_save/' . ($isNew ? '' : ('id=' . $translationId));
        $actions = [
            FormAction::save($actionUrl, '/admin/languages/translation_list/'),
            FormAction::cancel('/admin/languages/translation_list/'),
        ];

        return new FormEditViewModel(
            $this->getTranslationFormId(),
            $isNew ? 'Nowe tlumaczenie' : 'Edycja tlumaczenia',
            $data,
            $fields,
            [],
            $actions,
            'POST',
            $actionUrl,
            '/admin/languages/translation_list/',
            true,
            $isNew ? [] : ['id' => $translationId],
            null,
            $errors
        );
    }

    private function extractLegacyTranslations(array $values, array $languages): array
    {
        $result = [];
        foreach ($languages as $language) {
            $langId = (string)($language['id'] ?? '');
            $result[$langId] = (string)($values[$langId] ?? '');
        }

        return $result;
    }

    private function clearLanguageSessions(array $languages): void
    {
        foreach ($languages as $language) {
            if (!isset($language['id'])) {
                continue;
            }
            \S::delete_session('lang-' . (string)$language['id']);
        }
    }

    private function getLanguageFormId(): string
    {
        return 'languages-language-edit';
    }

    private function getTranslationFormId(): string
    {
        return 'languages-translation-edit';
    }
}