ladill-pos/app/Services/Afia/AfiaService.php

<?php

namespace App\Services\Afia;

use Illuminate\Support\Facades\Http;
use RuntimeException;

/**
 * Afia — Ladill in-app AI assistant scoped to POS. Calls the configured
 * provider (OpenAI/Anthropic) directly with the app's own key.
 */
class AfiaService
{
    public function enabled(): bool
    {
        return (bool) config('afia.enabled', true) && (string) config('afia.api_key', '') !== '';
    }

    /**
     * @param  array<int,array{role:string,text:string}>  $history
     * @param  array<string,mixed>  $context
     */
    public function chat(string $message, array $history, array $context): string
    {
        if (! $this->enabled()) {
            throw new RuntimeException('Afia is not configured.');
        }

        $provider = (string) config('afia.provider', 'openai');
        $model = (string) config('afia.model', 'gpt-4o-mini');
        $apiKey = (string) config('afia.api_key');

        $messages = [['role' => 'system', 'content' => $this->systemPrompt($context)]];
        foreach (array_slice($history, -8) as $turn) {
            $role = ($turn['role'] ?? 'user') === 'assistant' ? 'assistant' : 'user';
            $text = trim((string) ($turn['text'] ?? ''));
            if ($text !== '') {
                $messages[] = ['role' => $role, 'content' => $text];
            }
        }
        $messages[] = ['role' => 'user', 'content' => $message];

        return $provider === 'anthropic'
            ? $this->viaAnthropic($model, $apiKey, $messages)
            : $this->viaOpenAi($model, $apiKey, $messages);
    }

    private function viaOpenAi(string $model, string $apiKey, array $messages): string
    {
        $res = Http::withToken($apiKey)->acceptJson()->timeout(45)
            ->post('https://api.openai.com/v1/chat/completions', [
                'model' => $model,
                'temperature' => 0.3,
                'max_tokens' => 600,
                'messages' => $messages,
            ]);

        if ($res->failed()) {
            throw new RuntimeException('OpenAI request failed: '.$res->status());
        }

        return trim((string) $res->json('choices.0.message.content', ''));
    }

    private function viaAnthropic(string $model, string $apiKey, array $messages): string
    {
        $system = $messages[0]['content'];
        $turns = array_values(array_filter($messages, fn ($m) => $m['role'] !== 'system'));

        $res = Http::withHeaders([
            'x-api-key' => $apiKey,
            'anthropic-version' => '2023-06-01',
        ])->acceptJson()->timeout(45)->post('https://api.anthropic.com/v1/messages', [
            'model' => $model,
            'max_tokens' => 600,
            'system' => $system,
            'messages' => array_map(fn ($m) => ['role' => $m['role'], 'content' => $m['content']], $turns),
        ]);

        if ($res->failed()) {
            throw new RuntimeException('Anthropic request failed: '.$res->status());
        }

        return trim((string) $res->json('content.0.text', ''));
    }

    /** @param array<string,mixed> $context */
    private function systemPrompt(array $context): string
    {
        $ctx = collect($context)->map(fn ($v, $k) => "- {$k}: {$v}")->implode("\n");

        return <<<PROMPT
        You are Afia, the assistant inside Ladill POS (pos.ladill.com).
        Help users run the in-store register — taking sales, charging by cash or Card / MoMo, managing the product catalog, and reading their sales history. Be concise, friendly, and actionable: short numbered steps and name the screen or section to use.

        What Ladill POS does and where things live:
        - Overview (Dashboard): today's takings, number of sales, active products, and recent sales.
        - Register: the point-of-sale screen — add catalog products or a quick custom amount to the cart, then charge by cash or Card / MoMo (MoMo/card).
        - Products: the local catalog (name, SKU, price). Products can also be imported from Ladill CRM in Settings.
        - Sales: history of completed sales with receipts; a paid sale can be turned into a Ladill Invoice.
        - Settings: store details, default currency, and importing products from CRM or the Merchant storefront.

        Rules:
        - Only answer questions about Ladill POS — the register, sales, products, checkout (cash/Card / MoMo), receipts, and settings.
        - If asked about contacts, invoices, domains, hosting, email mailboxes, or QR codes, briefly say those live in other Ladill apps and suggest the app launcher.
        - Never invent figures (takings, counts) — use the user context below or tell them where to check.

        Current user context:
        {$ctx}
        PROMPT;
    }
}