<?php

use humhub\components\Migration;

class m260401_200000_add_slug extends Migration
{
    public function safeUp()
    {
        $schema = $this->db->getSchema()->getTableSchema('rescue_space_profile', true);
        if ($schema === null) {
            return;
        }

        if (!isset($schema->columns['slug'])) {
            $this->addColumn('rescue_space_profile', 'slug', $this->string(190)->null()->after('mission_statement'));
        }

        $rows = (new \yii\db\Query())
            ->select([
                'id' => 'rsp.id',
                'rescue_name' => 'rsp.rescue_name',
                'space_name' => 's.name',
            ])
            ->from(['rsp' => 'rescue_space_profile'])
            ->leftJoin(['cc' => 'contentcontainer'], 'cc.id = rsp.contentcontainer_id')
            ->leftJoin(['s' => 'space'], 's.contentcontainer_id = cc.id')
            ->orderBy(['rsp.id' => SORT_ASC])
            ->all($this->db);

        foreach ($rows as $row) {
            $source = trim((string)($row['space_name'] ?? ''));
            if ($source === '') {
                $source = trim((string)($row['rescue_name'] ?? ''));
            }

            $slug = $this->createUniqueSlug($source, (int)$row['id']);
            $this->update('rescue_space_profile', ['slug' => $slug], ['id' => (int)$row['id']]);
        }

        $this->alterColumn('rescue_space_profile', 'slug', $this->string(190)->notNull());
        $this->safeCreateIndex('ux_rescue_space_profile_slug', 'rescue_space_profile', 'slug', true);
    }

    public function safeDown()
    {
        $schema = $this->db->getSchema()->getTableSchema('rescue_space_profile', true);
        if ($schema === null || !isset($schema->columns['slug'])) {
            return;
        }

        $this->safeDropIndex('ux_rescue_space_profile_slug', 'rescue_space_profile');
        $this->dropColumn('rescue_space_profile', 'slug');
    }

    private function createUniqueSlug(string $source, int $rowId): string
    {
        $base = $this->normalizeToSlug($source);
        $candidate = $base;
        $counter = 1;

        while ($this->slugExists($candidate, $rowId)) {
            $candidate = $base . '-' . $counter;
            $counter++;
        }

        return $candidate;
    }

    private function normalizeToSlug(string $value): string
    {
        $normalized = trim($value);
        $ascii = @iconv('UTF-8', 'ASCII//TRANSLIT//IGNORE', $normalized);
        if ($ascii !== false) {
            $normalized = $ascii;
        }

        $slug = strtolower($normalized);
        $slug = preg_replace('/[^a-z0-9]+/', '-', $slug) ?? '';
        $slug = trim($slug, '-');

        return $slug !== '' ? $slug : 'rescue';
    }

    private function slugExists(string $slug, int $rowId): bool
    {
        return (new \yii\db\Query())
            ->from('rescue_space_profile')
            ->where(['slug' => $slug])
            ->andWhere(['!=', 'id', $rowId])
            ->exists($this->db);
    }
}