<?php
/**
 * Settings: what to audit and how. Sanitized on save; whitelist-driven.
 */
defined('ABSPATH') || exit;

class Postlint_Settings {

    public static function init() {
        add_action('admin_init', [__CLASS__, 'register']);
    }

    public static function defaults() {
        return [
            'post_types' => ['post', 'page'],
            'checks' => Postlint_Checks::default_enabled(),
            'thin_content_words' => 150,
            'batch_size' => 100,
            'default_image_id' => 0,
            'weekly_rescan' => false,
        ];
    }

    public static function get() {
        $stored = get_option(POSTLINT_OPTION_SETTINGS, []);
        return array_merge(self::defaults(), is_array($stored) ? $stored : []);
    }

    public static function register() {
        register_setting('postlint_settings', POSTLINT_OPTION_SETTINGS, [
            'type' => 'array',
            'sanitize_callback' => [__CLASS__, 'sanitize'],
            'default' => self::defaults(),
        ]);
    }

    public static function sanitize($raw) {
        $defaults = self::defaults();
        $raw = is_array($raw) ? $raw : [];

        $available_types = get_post_types(['public' => true], 'names');
        unset($available_types['attachment']);
        $types = isset($raw['post_types']) && is_array($raw['post_types'])
            ? array_values(array_intersect(array_map('strval', $raw['post_types']), $available_types))
            : $defaults['post_types'];
        if (empty($types)) {
            $types = ['post'];
        }

        $checks = isset($raw['checks']) && is_array($raw['checks'])
            ? array_values(array_intersect(array_map('strval', $raw['checks']), array_keys(Postlint_Checks::all_checks())))
            : $defaults['checks'];

        return [
            'post_types' => $types,
            'checks' => $checks,
            'thin_content_words' => max(1, min(5000, is_numeric($raw['thin_content_words'] ?? 150) ? (int) $raw['thin_content_words'] : 150)),
            'batch_size' => max(10, min(1000, is_numeric($raw['batch_size'] ?? 100) ? (int) $raw['batch_size'] : 100)),
            'default_image_id' => max(0, is_numeric($raw['default_image_id'] ?? 0) ? (int) $raw['default_image_id'] : 0),
            'weekly_rescan' => !empty($raw['weekly_rescan']),
        ];
    }
}