<?php
namespace Grav\Plugin;

use Grav\Common\Plugin;

class JsonExportPlugin extends Plugin
{
    public static function getSubscribedEvents()
    {
        return [
            'onPluginsInitialized' => ['onPluginsInitialized', 0]
        ];
    }

    public function onPluginsInitialized()
    {
        if ($this->isAdmin()) {
            return;
        }

        $this->enable([
            'onPagesInitialized' => ['onPagesInitialized', 0]
        ]);
    }

    public function onPagesInitialized()
    {
        $uri = $this->grav['uri'];
        $path = $uri->path();
        
        if (strpos($path, '/api/') !== 0) {
            return;
        }

        $lang = $_GET['lang'] ?? 'en';
        
        header('Content-Type: application/json');
        header('Access-Control-Allow-Origin: *');
        
        if ($path === '/api/stations') {
            echo json_encode($this->getStationsList($lang), JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
            exit;
        }
        
        if (preg_match('#^/api/station/([a-zA-Z0-9-]+)$#', $path, $matches)) {
            $station = $this->getStation($matches[1], $lang);
            if ($station) {
                echo json_encode($station, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
            } else {
                http_response_code(404);
                echo json_encode(['error' => 'Station not found']);
            }
            exit;
        }
        
        if ($path === '/api/translations') {
            echo json_encode($this->getTranslations($lang), JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
            exit;
        }
    }

    private function getStationsList($lang)
    {
        $pages = $this->grav['pages'];
        $stations = [];
        
        foreach ($pages->all() as $page) {
            if ($page->template() === 'station') {
                $header = $page->header();
                if (!($header->active ?? true)) continue;
                
                $stations[] = [
                    'id' => $header->station_id ?? $page->slug(),
                    'type' => $header->station_type ?? 'exhibit',
                    'title' => $this->getTranslated($header->title_translations ?? [], $lang),
                    'description' => $this->getTranslated($header->description_translations ?? [], $lang),
                    'order' => $header->order ?? 0
                ];
            }
        }
        
        usort($stations, fn($a, $b) => $a['order'] <=> $b['order']);
        return $stations;
    }

    private function getStation($stationId, $lang)
    {
        $pages = $this->grav['pages'];
        
        foreach ($pages->all() as $page) {
            if ($page->template() === 'station') {
                $header = $page->header();
                $id = $header->station_id ?? $page->slug();
                
                if ($id === $stationId) {
                    return $this->formatStation($page, $lang);
                }
            }
        }
        return null;
    }

    private function formatStation($page, $lang)
    {
        $header = $page->header();
        
        $station = [
            'id' => $header->station_id ?? $page->slug(),
            'type' => $header->station_type ?? 'exhibit',
            'language' => $lang,
            'title' => $this->getTranslated($header->title_translations ?? [], $lang),
            'description' => $this->getTranslated($header->description_translations ?? [], $lang),
            'components' => []
        ];
        
        if (isset($header->components) && is_array($header->components)) {
            foreach ($header->components as $comp) {
                $station['components'][] = $this->formatComponent($comp, $lang);
            }
        }
        
        return $station;
    }

    private function formatComponent($comp, $lang)
    {
        $out = [
            'id' => $comp['id'] ?? uniqid(),
            'type' => $comp['type'] ?? 'text'
        ];
        
        switch ($comp['type']) {
            case 'heading':
                $out['level'] = $comp['level'] ?? 'h2';
                $out['content'] = $this->getTranslated($comp['content'] ?? [], $lang);
                break;
            case 'text':
                $out['content'] = $this->getTranslated($comp['content'] ?? [], $lang);
                break;
            case 'video':
                $out['src'] = $this->getTranslated($comp['src'] ?? [], $lang);
                $out['poster'] = $comp['poster'] ?? null;
                $out['caption'] = $this->getTranslated($comp['caption'] ?? [], $lang);
                break;
            case 'audio':
                $out['src'] = $this->getTranslated($comp['src'] ?? [], $lang);
                $out['caption'] = $this->getTranslated($comp['caption'] ?? [], $lang);
                break;
            case 'tabs':
                $out['tabs'] = [];
                foreach ($comp['tabs'] ?? [] as $tab) {
                    $out['tabs'][] = [
                        'title' => $this->getTranslated($tab['title'] ?? [], $lang),
                        'content' => $this->getTranslated($tab['content'] ?? [], $lang)
                    ];
                }
                break;
            case 'slideshow':
                $out['slides'] = [];
                foreach ($comp['slides'] ?? [] as $slide) {
                    $out['slides'][] = [
                        'image' => $slide['image'] ?? '',
                        'caption' => $this->getTranslated($slide['caption'] ?? [], $lang)
                    ];
                }
                break;
        }
        
        return $out;
    }

    private function getTranslated($field, $lang)
    {
        if (is_string($field)) return $field;
        return $field[$lang] ?? $field['en'] ?? reset($field) ?: '';
    }

    private function getTranslations($lang)
    {
        $t = [
            'en' => [
                'appTitle' => 'EU Media Guide',
                'scanQR' => 'Scan QR Code',
                'selectLanguage' => 'Select Language',
                'contentLibrary' => 'Content Library',
                'loading' => 'Loading...',
                'play' => 'Play',
                'pause' => 'Pause',
                'next' => 'Next',
                'previous' => 'Previous',
                'menu' => 'Menu',
                'close' => 'Close'
            ],
            'fr' => [
                'appTitle' => 'Guide Média UE',
                'scanQR' => 'Scanner le code QR',
                'selectLanguage' => 'Choisir la langue',
                'contentLibrary' => 'Bibliothèque',
                'loading' => 'Chargement...',
                'play' => 'Lecture',
                'pause' => 'Pause',
                'next' => 'Suivant',
                'previous' => 'Précédent',
                'menu' => 'Menu',
                'close' => 'Fermer'
            ],
            'de' => [
                'appTitle' => 'EU Medienführer',
                'scanQR' => 'QR-Code scannen',
                'selectLanguage' => 'Sprache wählen',
                'contentLibrary' => 'Inhaltsbibliothek',
                'loading' => 'Laden...',
                'play' => 'Abspielen',
                'pause' => 'Pause',
                'next' => 'Weiter',
                'previous' => 'Zurück',
                'menu' => 'Menü',
                'close' => 'Schließen'
            ],
            'nl' => [
                'appTitle' => 'EU Mediagids',
                'scanQR' => 'QR-code scannen',
                'selectLanguage' => 'Taal selecteren',
                'contentLibrary' => 'Inhoudsbibliotheek',
                'loading' => 'Laden...',
                'play' => 'Afspelen',
                'pause' => 'Pauze',
                'next' => 'Volgende',
                'previous' => 'Vorige',
                'menu' => 'Menu',
                'close' => 'Sluiten'
            ],
            'it' => [
                'appTitle' => 'Guida Media UE',
                'scanQR' => 'Scansiona codice QR',
                'selectLanguage' => 'Seleziona lingua',
                'contentLibrary' => 'Libreria contenuti',
                'loading' => 'Caricamento...',
                'play' => 'Riproduci',
                'pause' => 'Pausa',
                'next' => 'Successivo',
                'previous' => 'Precedente',
                'menu' => 'Menu',
                'close' => 'Chiudi'
            ],
            'es' => [
                'appTitle' => 'Guía de Medios UE',
                'scanQR' => 'Escanear código QR',
                'selectLanguage' => 'Seleccionar idioma',
                'contentLibrary' => 'Biblioteca de contenido',
                'loading' => 'Cargando...',
                'play' => 'Reproducir',
                'pause' => 'Pausa',
                'next' => 'Siguiente',
                'previous' => 'Anterior',
                'menu' => 'Menú',
                'close' => 'Cerrar'
            ]
        ];
        return $t[$lang] ?? $t['en'];
    }
}