<?php

namespace App\Service;

use App\Entity\Note;
use App\Entity\SentenceListeningNote;
use App\Entity\SentenceNote;
use App\Utils\Japanese;
use Symfony\Contracts\HttpClient\HttpClientInterface;

class AnkiService
{
    function __construct(
        private HttpClientInterface $client,
    ) {}

    private function request(string $action, array $params): mixed
    {
        ['error' => $error, 'result' => $result] = $this->client->request(
            'POST',
            'http://localhost:8765',
            ['json' => [
                'action' => $action,
                'version' =>  6,
                'params' => $params,
            ]]
        )->toArray();

        if ($error != null) {
            throw new \Exception('AnkiConnect returned error: ' . $error);
        }

        return $result;
    }

    /** The note's id is updated on success.
     * @return bool True on success
     */
    public function addNote(Note &$note, string $deckName): bool
    {
        $note->setId($this->request('addNote', ['note' => [
            'deckName'  =>  $deckName,
            'modelName' => $note->getModel(),
            'fields'    => $note->getFields(),
            'options'   => ['allowDuplicate' => false],
            'tags'      => array_merge($note->getTags(), ['anker_made']),
        ]]));

        return $note->getId() !== null;
    }

    public function findNotesIds(string $query): array
    {
        return $this->request('findNotes', ['query' => $query]);
    }

    public function getAllSentenceListeningNoteIds(): array
    {
        $query = sprintf(
            '"note:%s"',
            SentenceListeningNote::MODEL_NAME,
        );

        return $this->request('findNotes', ['query' => $query]);
    }

    public function getAllSentenceNoteIds(): array
    {
        return $this->request(
            'findNotes',
            ['query' => '"note:Japanese sentences" -is:suspended'],
        );
    }

    /** Give an array of IDs, the note Infos are returned. if info for a given
     *  doesn't exist, it is assigned to null instead of the default [].
     */
    public function getNotesInfo(array $noteIds): array
    {
        $noteInfos = $this->request('notesInfo', ['notes' => $noteIds]);

        foreach ($noteInfos as &$noteInfo) {
            if ([] === $noteInfo) $noteInfo = null;
        }

        return $noteInfos;
    }

    /** Returns info form note given an ID, returns null if it doesn't exist */
    public function getNoteInfo(int $noteId): ?array
    {
        return $this->getNotesInfo([$noteId])[0];
    }

    public function getNotes(array $nids): array
    {
        return array_map(self::parseNoteInfo(...), $this->getNotesInfo($nids));
    }

    public function getNote(int $nid): ?Note
    {
        $noteInfo = $this->getNoteInfo($nid)
            ?? throw new \Exception("Note $nid not found.");

        return self::parseNoteInfo($noteInfo);
    }

    private static function parseNoteInfo(array $noteInfo): Note
    {
        return match ($noteInfo['modelName']) {
            SentenceNote::MODEL_NAME          => SentenceNote::fromAnki($noteInfo),
            SentenceListeningNote::MODEL_NAME => SentenceListeningNote::fromAnki($noteInfo),
            default => throw new \Exception(sprintf(
                'Unrecognized Note "%s" of type "%s"',
                $noteInfo['noteId'],
                $noteInfo['modelName'],
            ))
        };
    }

    public function getLatestNote(): ?Note
    {
        // NoteIDs are just timestamps in milliseconds, so the latest is just
        // the biggest numerically
        $latestId = max($this->getAllSentenceNoteIds());
        return $this->getNote($latestId);
    }

    public function updateNote(Note $note)
    {
        $this->request('guiBrowse', ['query' => 'nid:1']);
        $this->request('updateNoteFields', ['note' => $note->toAnki()]);
        $this->request('guiBrowse', ['query' => 'nid:' . $note->getId()]);
    }

    /** @return array<string, int> */
    public function getKnownSlnKanjiCounts(): array
    {
        $allListeningIds = $this->getAllSentenceListeningNoteIds();
        $ret = [];

        foreach ($this->getNotes($allListeningIds) as $slNote) {
            assert($slNote instanceof SentenceListeningNote);

            $termKanji = Japanese::getOnlyKanji($slNote->getTerm()->getKanji());
            $len = mb_strlen($termKanji);
            for ($i = 0; $i < $len; $i++) {
                $kanji = mb_substr($termKanji, $i, 1);

                $ret[$kanji] ??= 0;
                $ret[$kanji]++;
            }
        }

        return $ret;
    }
}