<?php

declare(strict_types=1);

namespace Evomedien\FeComment\Service;

use TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * Typed access to the extension configuration (Settings > Extension
 * Configuration > fe_comment). Every accessor is failure-tolerant: an
 * unconfigured extension behaves like "everything empty, headless mode".
 */
final class ExtensionSettings
{
    /** @var array<string,mixed> */
    private array $settings;

    public function __construct()
    {
        try {
            $this->settings = (array)GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('fe_comment');
        } catch (\Throwable) {
            $this->settings = [];
        }
    }

    /** @return string[] */
    public function mailTo(): array
    {
        return $this->addressList('mailTo');
    }

    /** @return string[] */
    public function mailCc(): array
    {
        return $this->addressList('mailCc');
    }

    /** @return string[] */
    public function mailBcc(): array
    {
        return $this->addressList('mailBcc');
    }

    public function subject(): string
    {
        $subject = trim((string)($this->settings['subject'] ?? ''));
        return $subject !== '' ? $subject : 'Page feedback';
    }

    /** Master switch: off serves an empty widget and rejects submissions. */
    public function enabled(): bool
    {
        return (bool)($this->settings['enabled'] ?? true);
    }

    /** FE user group required to use the widget; 0 = any logged-in user. */
    public function feUserGroup(): int
    {
        return (int)($this->settings['feUserGroup'] ?? 0);
    }

    /** Storage pid for the feedback records (backend visibility). */
    public function storagePid(): int
    {
        return (int)($this->settings['storagePid'] ?? 0);
    }

    /** Page uid of the feedback overview page; 0 = no overview link. */
    public function overviewPid(): int
    {
        return (int)($this->settings['overviewPid'] ?? 0);
    }

    /**
     * Selectable recipients, parsed from "Label <mail>; Label2 <mail2>".
     * The index doubles as the id the widget sends back.
     *
     * @return array<int,array{label:string,email:string}>
     */
    public function recipients(): array
    {
        $recipients = [];
        foreach (GeneralUtility::trimExplode(';', (string)($this->settings['recipients'] ?? ''), true) as $entry) {
            if (preg_match('/^(.*)<([^>]+)>\s*$/', $entry, $m) && GeneralUtility::validEmail(trim($m[2]))) {
                $recipients[] = ['label' => trim($m[1]) ?: trim($m[2]), 'email' => trim($m[2])];
            } elseif (GeneralUtility::validEmail(trim($entry))) {
                $recipients[] = ['label' => trim($entry), 'email' => trim($entry)];
            }
        }
        return $recipients;
    }

    /** true = headless: TYPO3 injects nothing, the front end embeds the widget itself. */
    public function jsonOutput(): bool
    {
        return (bool)($this->settings['jsonOutput'] ?? true);
    }

    /** @return string[] valid mail addresses only */
    private function addressList(string $key): array
    {
        $addresses = [];
        foreach (GeneralUtility::trimExplode(',', (string)($this->settings[$key] ?? ''), true) as $address) {
            if (GeneralUtility::validEmail($address)) {
                $addresses[] = $address;
            }
        }
        return $addresses;
    }
}