<?php

namespace App\Services\PBX;

/**
 * Prompt paths for the GLN and Survey AGIs.
 *
 * Arabic prompt paths are the existing, unchanged paths. English prompts use
 * the same filename with "-en" appended before the extension, e.g.
 * en/custom/survey-q2-en.wav. The AGIs assume every prompt exists and is
 * playable; no filesystem checks are performed and no file is created,
 * copied, renamed or moved here.
 */
class AgiPromptPaths
{
    public const SURVEY_THANKS_PROMPT = 'en/custom/survey-thanks';

    public const ENGLISH_PROMPT_SUFFIX = '-en';

    private const GLN_PROMPTS = [
        CallLanguageResolver::LANGUAGE_ARABIC => 'en/custom/gln',
        CallLanguageResolver::LANGUAGE_ENGLISH => 'en/custom/gln-en',
    ];

    /**
     * Arabic (default) Survey prompts. These paths and filenames are unchanged.
     */
    private const SURVEY_PROMPTS = [
        1 => 'en/custom/survey',
        2 => 'en/custom/survey-q2',
        3 => 'en/custom/survey-q3',
        4 => 'en/custom/survey-q4',
        5 => 'en/custom/survey-q5',
    ];

    public static function glnPromptForLanguage(string $language): string
    {
        return self::GLN_PROMPTS[$language] ?? self::GLN_PROMPTS[CallLanguageResolver::LANGUAGE_ARABIC];
    }

    /**
     * @return array<int, string>
     */
    public static function surveyPromptsForLanguage(string $language): array
    {
        return array_map(
            static fn (string $prompt) => self::localizedPrompt($prompt, $language),
            self::SURVEY_PROMPTS
        );
    }

    public static function surveyThanksPromptForLanguage(string $language): string
    {
        return self::localizedPrompt(self::SURVEY_THANKS_PROMPT, $language);
    }

    /**
     * Arabic keeps the existing path untouched; English appends "-en" before
     * the file extension.
     */
    public static function localizedPrompt(string $prompt, string $language): string
    {
        return $language === CallLanguageResolver::LANGUAGE_ENGLISH
            ? self::englishPromptPath($prompt)
            : $prompt;
    }

    public static function englishPromptPath(string $prompt): string
    {
        $lastSlash = strrpos($prompt, '/');
        $lastDot = strrpos($prompt, '.');

        if ($lastDot !== false && ($lastSlash === false || $lastDot > $lastSlash)) {
            return substr($prompt, 0, $lastDot) . self::ENGLISH_PROMPT_SUFFIX . substr($prompt, $lastDot);
        }

        return $prompt . self::ENGLISH_PROMPT_SUFFIX;
    }
}