<?php

namespace App\Controller;

use App\Entity\UnicodeNote;
use App\Service\AnkiService;
use App\Service\CharListService;
use App\Utils\Japanese;
use App\Utils\Number;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Attribute\MapQueryParameter;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\VarExporter\VarExporter;

#[Route('/kanji', name: 'app_kanji_')]
class KanjiController extends AbstractController
{
    function __construct(
        private AnkiService     $anki,
        private CharListService $charList,
        private string          $varBasepath,
    ) {}

    public static function tmpl(string $path): string
    {
        return "kanji/$path.html.twig";
    }

    /** @return array<string, string> */
    public function getIgnoredList(): array
    {
        $path = "{$this->getParameter('kernel.project_dir')}/data/ignored.list";
        $ret = [];

        $file = fopen($path, 'r');
        while (($kanji = fgets($file)) !== false) {
            $kanji = mb_trim($kanji);
            $ret[$kanji] = '';

            if (mb_strlen($kanji) !== 1) throw new \Exception(sprintf(
                'Kanji expected, got "%s"',
                $kanji,
            ));
            while (($explanation = fgets($file)) !== false) {
                if ($explanation === "\n") continue 2;
                $ret[$kanji] .= $explanation;
            }
            $ret[$kanji] = mb_rtrim($ret[$kanji]);
        }

        return $ret;
    }

    /** @return array<string, array<string, 0>> */
    private function getCharInfo(bool $force = false): array
    {
        $cacheFile = "$this->varBasepath/charlist.php";

        if (!$force and file_exists($cacheFile)) return require $cacheFile;

        $ret = [];

        $lists = [
            'sn'      => $this->anki->getKnownSnKanjiCounts(),
            'sln'     => $this->anki->getKnownSlnKanjiCounts(),
            'unicode' => $this->anki->getUnicodeKanji(),
            'ignored' => $this->getIgnoredList(),
        ];

        // @formatter:off
        $storedLists = [
            'taiwan', 'bushu', 'kyoyou', 'kyuujitai', 'kanken', 'hsk', 'zhcn',
            'jimaku', 'ebook',
        ];
        // @formatter:on
        foreach ($storedLists as $storedName) {
            $storedList = $this->charList->getList($storedName);

            // Simple list
            if (key_exists('chars', $storedList)) {
                $lists[$storedName] = $storedList['chars'];
            } else {
                foreach ($storedList['sublists'] as $subname => $sublist) {
                    $lists["$storedName-$subname"] = $sublist['chars'];
                }
            }
        }

        foreach ($lists as $listName => $list) {
            foreach (array_keys($list) as $char) {
                $ret[$char] ??= [];
                $ret[$char][$listName] = 0;
            }
        }

        file_put_contents($cacheFile, '<?php return ' . VarExporter::export($ret) . ';');

        return $ret;
    }

    #[Route('/{start}-{end}', name: 'index')]
    public function index(
        string $start,
        string $end,
        Request $request,
    ): Response {
        $charInfo = $this->getCharInfo(force: $request->isNoCache());

        $completedRows = [];
        $completedFlag = true;
        $chars = [];
        foreach (range(intval("{$start}0", 16), intval("{$end}f", 16)) as $codepoint) {
            $charStr = mb_chr($codepoint, 'UTF-8');

            if (
                !key_exists('ignored', $charInfo[$charStr] ?? ['ignored' => 0])
                and !key_exists('unicode', $charInfo[$charStr] ?? [])
            ) {
                $completedFlag = false;
            }
            if (($codepoint + 1) % 0x10 === 0) {
                if ($completedFlag === true) $completedRows[] = dechex($codepoint - 0xf);
                $completedFlag = true;
            }

            $chars[] = [
                'str'       => $charStr,
                'codepoint' => dechex($codepoint),
                'lists'     => $charInfo[$charStr] ?? [],
            ];
        }

        return $this->render(self::tmpl('grid'), [
            'characters' => $chars,
            'completed'  => $completedRows,
        ]);
    }

    #[Route('/{codepoint}/register', 'register', methods: 'GET')]
    public function register(string $codepoint): Response
    {
        // Properly check it's valid (make a util?)
        $charStr = mb_chr(Number::hexint($codepoint), 'UTF-8');

        $note = UnicodeNote::fromCharacter($charStr);
        $terms = $this->anki->searchTerms($charStr);
        $note->setTerms($terms);

        $this->anki->addNote($note, UnicodeNote::DECK);

        return new Response();
    }

    #[Route('view', 'view', methods: 'GET')]
    public function view(#[MapQueryParameter] string $char): Response
    {
        $charStr = ctype_xdigit($char) ? Number::parseCodepoint($char) : $char;
        $codepoint =  ctype_xdigit($char) ? $char : dechex(mb_ord($char));

        $charInfo = $this->getCharInfo()[$charStr] ?? [];
        //$listTitles = $this->charList->getTitles();

        $jiten = json_decode(file_get_contents(
            "{$this->getParameter('kernel.project_dir')}/data/kanken-links.json",
        ), true);

        $terms = $this->anki->searchTerms($charStr);

        $ebookRef = require "$this->varBasepath/ebook-ref.php";

        return $this->render(self::tmpl('view'), [
            'ignored_text' => $this->getIgnoredList()[$charStr] ?? null,
            'char'         => $charStr,
            'codepoint'    => $codepoint,
            'info'         => $charInfo,
            'terms'        => $terms,
            'ref'          => $ebookRef[$charStr] ?? [],
            'jiten_href'   => key_exists($charStr, $jiten)
                ? "https://kanji.jitenon.jp/kanji{$jiten[$charStr]}"
                : null
        ]);
    }
}