<?php

declare(strict_types=1);

namespace App\Config;

final class AgentRunnerConfig
{
    /**
     * @param array<string, mixed> $config
     */
    public function __construct(
        private readonly array $config = [],
    ) {
    }

    public function getCommerceHistoryBudgetChars(): int
    {
        return $this->getInt('commerce_history_budget_chars', 1000);
    }

    public function getProductSearchKnowledgeChunkLimit(): int
    {
        return $this->getInt('product_search_knowledge_chunk_limit', 6);
    }

    public function getAdvisoryProductSearchKnowledgeChunkLimit(): int
    {
        return $this->getInt('advisory_product_search_knowledge_chunk_limit', 9);
    }

    public function getOptimizedShopQueryPrefixPattern(): string
    {
        return $this->getString('optimized_shop_query_prefix_pattern', '/^(?:keywords?|suchquery|search\\s*query|query)\\s*:\\s*/iu');
    }

    public function getOptimizedShopQueryTrimCharacters(): string
    {
        return $this->getString('optimized_shop_query_trim_characters', " \t\n\r\0\x0B\"'`");
    }

    private function getInt(string $key, int $default): int
    {
        $value = $this->value($key, $default);

        return is_numeric($value) ? (int) $value : $default;
    }

    private function getBool(string $key, bool $default): bool
    {
        $value = $this->value($key, $default);

        if (is_bool($value)) {
            return $value;
        }

        if (is_scalar($value)) {
            $normalized = strtolower(trim((string) $value));

            if (in_array($normalized, ['1', 'true', 'yes', 'on'], true)) {
                return true;
            }

            if (in_array($normalized, ['0', 'false', 'no', 'off'], true)) {
                return false;
            }
        }

        return $default;
    }

    private function getString(string $key, string $default): string
    {
        $value = $this->value($key, $default);

        return is_string($value) && $value !== '' ? $value : $default;
    }

    /**
     * @param string[] $default
     * @return string[]
     */
    private function getStringList(string $key, array $default): array
    {
        $value = $this->value($key, $default);

        if (!is_array($value)) {
            return $default;
        }

        $out = [];

        foreach ($value as $item) {
            if (!is_scalar($item)) {
                continue;
            }

            $item = trim((string) $item);

            if ($item !== '') {
                $out[] = $item;
            }
        }

        return $out !== [] ? $out : $default;
    }

    private function value(string $key, mixed $default): mixed
    {
        $current = $this->config;

        foreach (explode('.', $key) as $segment) {
            if (!is_array($current) || !array_key_exists($segment, $current)) {
                return $default;
            }

            $current = $current[$segment];
        }

        return $current;
    }

    public function getEmptyPromptMessage(): string
    {
        return $this->getString('messages.empty_prompt', '❌ Empty prompt.');
    }

    public function getAnalyzeRequestMessage(): string
    {
        return $this->getString('messages.analyze_request', 'Ich analysiere deine Anfrage...');
    }

    public function getCheckInternetSourcesMessage(): string
    {
        return $this->getString('messages.check_internet_sources', 'Ich prüfe auf Internetquellen...');
    }

    public function getRetrieveKnowledgeMessage(): string
    {
        return $this->getString('messages.retrieve_knowledge', 'Ich hole relevante Daten aus meinem RAG-Wissen...');
    }

    public function getOptimizeSearchMessage(): string
    {
        return $this->getString('messages.optimize_search', 'Ich optimiere die Recherche...');
    }

    public function getNoConcreteShopQueryMessage(): string
    {
        return $this->getString(
            'messages.no_concrete_shop_query',
            'Ich habe keine konkrete Shop-Suchanfrage erkannt. Bitte nenne das Produkt, Zubehör oder die Artikelnummer.'
        );
    }

    public function getFetchSearchDataMessageTemplate(): string
    {
        return $this->getString('messages.fetch_search_data_template', 'Ich rufe Recherchedaten ab (type: %s)');
    }

    public function getAnalyzeAllInformationMessage(): string
    {
        return $this->getString('messages.analyze_all_information', 'Ich analysiere alle Informationen...');
    }

    public function getThinkingWhileStreamingMessage(): string
    {
        return $this->getString('messages.thinking_while_streaming', 'Denke nach...');
    }

    public function getNoLlmDataReceivedMessage(): string
    {
        return $this->getString('messages.no_llm_data_received', '❌ Es wurden keine Daten vom LLM empfangen.');
    }

    public function getGenericInternalErrorMessage(): string
    {
        return $this->getString('messages.generic_internal_error', '❌ Bei der Verarbeitung der Anfrage ist ein interner Fehler aufgetreten.');
    }

    public function getDebugInternalErrorPrefix(): string
    {
        return $this->getString('messages.debug_internal_error_prefix', '❌ Interner Fehler: ');
    }

    public function getExternalUrlSourceLabel(): string
    {
        return $this->getString('source_labels.external_url', 'Externe URL');
    }

    public function getRagKnowledgeSourceLabel(): string
    {
        return $this->getString('source_labels.rag_knowledge', 'RAG Wissen');
    }

    public function getConversationHistorySourceLabel(): string
    {
        return $this->getString('source_labels.conversation_history', 'Chatverlauf');
    }

    public function getShopSystemSourceLabel(): string
    {
        return $this->getString('source_labels.shop_system', 'Shopsystem');
    }

    public function getExtendedShopSearchSourceLabel(): string
    {
        return $this->getString('source_labels.extended_shop_search', 'Erweiterte Shopsuche');
    }

    public function getUsedSourcesPrefix(): string
    {
        return $this->getString('source_labels.used_sources_prefix', 'Genutzte Quellen: ');
    }

    public function getSourcesPrefix(): string
    {
        return $this->getString('source_labels.sources_prefix', 'Quellen: ');
    }

    public function getSourceBadgeHtmlTemplate(): string
    {
        return $this->getString('html.source_badge_template', '<span class="badge bg-info text-black">%s</span>');
    }

    public function getErrorHtmlTemplate(): string
    {
        return $this->getString('html.error_template', '<div class="retriex-alert retriex-alert--error"><div class="retriex-alert__icon">❌</div><div class="retriex-alert__content"><div class="retriex-alert__title">Hinweis</div><div class="retriex-alert__text">%s</div></div></div>' . "\n");
    }

    public function getThinkHtmlTemplate(): string
    {
        return $this->getString('html.think_template', '<span class="text-info think">%s</span>' . "\n");
    }

    public function getInfoHtmlTemplate(): string
    {
        return $this->getString('html.info_template', "\n\n" . '<span class="text-info fw-bolder">%s</span>' . "\n");
    }

    public function getDebugHtmlTemplate(): string
    {
        return $this->getString('html.debug_template', "\n\nDEBUG: <code>%s</code>\n");
    }

    public function getShopPrompt(string $prompt, string $commerceHistoryContext = ''): string
    {
        $historyBlock = '';

        if (trim($commerceHistoryContext) !== '') {
            $historyBlock = $this->buildHistoryBlock($commerceHistoryContext);
        }

        return $this->implodePromptBlocks([
            $this->getShopPromptIntro(),
            $this->buildRulesBlock($this->getShopPromptRules()),
            $this->getShopPromptOutputFormatBlock(),
            $historyBlock,
            $this->getCurrentUserInputLabel() . ':',
            trim($prompt),
        ]);
    }

    private function buildHistoryBlock(string $commerceHistoryContext): string
    {
        return $this->implodePromptBlocks([
            $this->getRecentConversationContextLabel() . ':',
            trim($commerceHistoryContext),
            $this->buildRulesBlock($this->getConversationContextRules(), 'Additional rules for conversation context:'),
        ]);
    }

    /**
     * @return string[]
     */
    public function getShopPromptRules(): array
    {
        return $this->getStringList('shop_prompt.rules', [
            '- Output only the final search query.',
            '- Always convert relevant search terms to their singular form.',
            '- No introduction, no explanation, no quotation marks.',
            '- Use only shop-relevant search terms from the user input for a shop search.',
            '- Maximum 6 search terms, preferably fewer.',
            '- Remove filler words, polite phrases, and irrelevant words.',
            '- Preserve product names, brands, model numbers, and compound terms exactly if they are relevant.',
            '- Preserve the language of the CURRENT USER INPUT for generic product/search terms; do not translate German search terms into English.',
            '- For German user input, output German shop terms, for example "freies Chlor Messung" instead of "free chlorine measurement".',
            '- Preserve domain terms from the current user input or resolved context in their original language.',
            '- Numbers that belong to a product name or model must be preserved (e.g. Indikator 300, Testomat 808, Testomat 2000).',
            '- Separate terms using spaces only.',
            '- If a relevant product name is present, it must be placed at the beginning of the final search query.',
            '- Try to always identify all products mentioned in the user input text, even in long prompts.',
            '- Look for terms such as Testomat, Horiba, Tritromat, or words like indicator/Indikator.',
            '- If the current user input is vague or referential, use the recent conversation context only as support.',
            '- Do not output words that only describe conversation flow, such as "same", "again", "also", or "like above".',
        ]);
    }

    /**
     * @return string[]
     */
    public function getConversationContextRules(): array
    {
        return $this->getStringList('shop_prompt.conversation_context_rules', [
            '- The current user input has highest priority.',
            '- Use the recent conversation context only to resolve omitted references.',
            '- Use it only for product carry-over, brand carry-over, model carry-over, or variant follow-ups.',
            '- Do not revive older products unless the current user input clearly refers to them.',
            '- If the current input starts a new topic, ignore older product context.',
            '- Prefer the most recent product reference over older ones.',
        ]);
    }

    public function getShopPromptIntro(): string
    {
        return $this->getString('shop_prompt.intro', 'Generate a short search query for Shopware 6 from the following user input text.');
    }

    public function getShopPromptOutputFormatBlock(): string
    {
        return $this->getString('shop_prompt.output_format_block', "Output format:\nKeyword1 Keyword2 Keyword3");
    }

    public function getRecentConversationContextLabel(): string
    {
        return $this->getString('shop_prompt.recent_conversation_context_label', 'RECENT CONVERSATION CONTEXT');
    }

    public function getCurrentUserInputLabel(): string
    {
        return $this->getString('shop_prompt.current_user_input_label', 'CURRENT USER INPUT');
    }

    public function isShopQueryLanguagePreservationEnabled(): bool
    {
        return $this->getBool('shop_prompt.language_preservation.enabled', true);
    }

    /**
     * @return array<string, string[]>
     */
    public function getShopQueryLanguageMarkers(): array
    {
        $default = [
            'de' => [
                ' ä ', ' ö ', ' ü ', ' ß ',
                ' der ', ' die ', ' das ', ' ein ', ' eine ', ' einer ', ' einen ',
                ' welchem ', ' welchen ', ' welche ', ' welcher ',
                ' kann ', ' nutzen ', ' zur ', ' für ', ' fuer ',
                ' messung ', ' indikator ', ' reagenz ', ' chlor ',
            ],
        ];

        $value = $this->value('shop_prompt.language_preservation.language_markers', $default);

        if (!is_array($value)) {
            return $default;
        }

        $out = [];

        foreach ($value as $language => $markers) {
            if (!is_string($language) || !is_array($markers)) {
                continue;
            }

            $cleanMarkers = [];

            foreach ($markers as $marker) {
                if (!is_scalar($marker)) {
                    continue;
                }

                $marker = strtolower((string) $marker);

                if ($marker !== '') {
                    $cleanMarkers[] = $marker;
                }
            }

            if ($cleanMarkers !== []) {
                $out[$language] = array_values(array_unique($cleanMarkers));
            }
        }

        return $out !== [] ? $out : $default;
    }

    /**
     * @return array<string, string>
     */
    public function isShopQueryMetaGuardEnabled(): bool
    {
        return $this->getBool('shop_prompt.meta_query_guard.enabled', true);
    }

    /**
     * @return string[]
     */
    public function getShopQueryMetaOnlyTerms(): array
    {
        return $this->getStringList('shop_prompt.meta_query_guard.meta_only_terms', [
            'shop',
            'shopsuche',
            'shop-suche',
            'suche',
            'suchen',
            'such',
            'finde',
            'find',
            'zeige',
            'zeig',
            'bitte',
            'mal',
            'im',
            'in',
            'nach',
            'den',
            'die',
            'das',
            'der',
            'dem',
        ]);
    }

    public function isShopQueryContextFallbackEnabled(): bool
    {
        return $this->getBool('shop_prompt.meta_query_guard.context_fallback_enabled', true);
    }

    public function getShopQueryContextFallbackQuestionLimit(): int
    {
        return $this->getInt('shop_prompt.meta_query_guard.context_fallback_question_limit', 12);
    }

    public function getShopQueryContextFallbackHistoryBudgetChars(): int
    {
        return $this->getInt('shop_prompt.meta_query_guard.context_fallback_history_budget_chars', 20000);
    }

    public function shouldUseFullHistoryForShopQueryContextFallback(): bool
    {
        return $this->getBool('shop_prompt.meta_query_guard.context_fallback_use_full_history', true);
    }

    public function getShopQueryContextFallbackMaxTerms(): int
    {
        return $this->getInt('shop_prompt.meta_query_guard.context_fallback_max_terms', 6);
    }

    /**
     * @return string[]
     */
    public function getShopQueryContextFallbackFilterTerms(): array
    {
        return $this->getStringList('shop_prompt.meta_query_guard.context_fallback_filter_terms', [
            'mit',
            'welche',
            'welcher',
            'welches',
            'welchem',
            'welchen',
            'was',
            'wie',
            'wo',
            'kann',
            'koennen',
            'können',
            'konnte',
            'könnte',
            'ich',
            'wir',
            'man',
            'nutzen',
            'benutzen',
            'verwenden',
            'verwende',
            'nehmen',
            'zur',
            'zum',
            'für',
            'fuer',
            'messen',
            'gemessen',
            'messung',
        ]);
    }

    public function isShopQueryContextAnchorEnrichmentEnabled(): bool
    {
        return $this->getBool('shop_prompt.context_anchor_enrichment.enabled', true);
    }

    public function getShopQueryContextAnchorEnrichmentMaxQueryTerms(): int
    {
        return $this->getInt('shop_prompt.context_anchor_enrichment.max_query_terms', 2);
    }

    /**
     * @return string[]
     */
    public function getShopQueryContextAnchorEnrichmentTriggerTerms(): array
    {
        return $this->getStringList('shop_prompt.context_anchor_enrichment.trigger_terms', [
            'indikator',
            'indikatortyp',
            'indicator',
            'reagenz',
            'reagenzsatz',
            'reagent',
            'zubehör',
            'zubehor',
            'accessory',
        ]);
    }

    /**
     * @return string[]
     */
    public function getShopQueryContextAnchorEnrichmentPatterns(): array
    {
        return $this->getStringList('shop_prompt.context_anchor_enrichment.anchor_patterns', [
            '/\b(?:indikator(?:typ)?|indicator(?:\s+type)?|reagenz(?:satz|typ)?|reagent(?:\s+set|\s+type)?|typ|type)\s+[A-Za-zÄÖÜäöüß]{0,8}\s*\d{1,5}(?:\s*[A-ZÄÖÜ]{1,4})?(?:\s*%)?\b/iu',
        ]);
    }

    public function getShopQueryContextAnchorEnrichmentTemplate(): string
    {
        return $this->getString('shop_prompt.context_anchor_enrichment.template', '{anchor} {query}');
    }
    public function getShopQueryTranslationReplacements(string $language): array
    {
        $default = [
            'de' => [
                'free chlorine' => 'freies chlor',
                'free chlor' => 'freies chlor',
                'total chlorine' => 'gesamtchlor',
                'chlorine measurement' => 'chlor messung',
                'water hardness' => 'wasserhärte',
                'measurement' => 'messung',
                'measuring' => 'messung',
                'chlorine' => 'chlor',
                'indicator' => 'indikator',
                'indicators' => 'indikatoren',
                'reagent' => 'reagenz',
                'reagents' => 'reagenzien',
                'accessory' => 'zubehör',
                'accessories' => 'zubehör',
            ],
        ];

        $value = $this->value(
            'shop_prompt.language_preservation.translation_replacements.' . $language,
            $default[$language] ?? []
        );

        if (!is_array($value)) {
            return $default[$language] ?? [];
        }

        $out = [];

        foreach ($value as $source => $target) {
            if (!is_scalar($source) || !is_scalar($target)) {
                continue;
            }

            $source = strtolower(trim((string) $source));
            $target = trim((string) $target);

            if ($source !== '' && $target !== '') {
                $out[$source] = $target;
            }
        }

        uksort($out, static fn(string $a, string $b): int => strlen($b) <=> strlen($a));

        return $out !== [] ? $out : ($default[$language] ?? []);
    }

    private function buildRulesBlock(array $rules, string $headline = 'Rules:'): string
    {
        return $headline . "\n" . implode("\n", $rules);
    }

    /**
     * @param string[] $blocks
     */
    private function implodePromptBlocks(array $blocks): string
    {
        $normalized = array_values(array_filter(
            array_map(
                static fn(string $block): string => trim($block),
                $blocks
            ),
            static fn(string $block): bool => $block !== ''
        ));

        return implode("\n\n", $normalized);
    }
}