<?php

namespace App\Services\Afia;

use App\Models\PlatformSetting;
use Illuminate\Support\Facades\Schema;

/**
 * Resolves AI credentials from ladilldb.platform_settings (admin → Platform settings)
 * with .env fallbacks for local/dev.
 */
class PlatformAiConfig
{
    /** @var array<string, mixed> */
    private array $cache = [];

    public function enabled(): bool
    {
        $platformFlag = $this->setting('ai_enabled');
        if ($platformFlag !== null && ! filter_var($platformFlag, FILTER_VALIDATE_BOOLEAN)) {
            return false;
        }

        if (! (bool) config('afia.enabled', true)) {
            return false;
        }

        return $this->apiKey() !== '';
    }

    public function provider(): string
    {
        $provider = strtolower(trim((string) ($this->setting('ai_provider') ?? config('afia.provider', 'openai'))));

        return in_array($provider, ['openai', 'anthropic'], true) ? $provider : 'openai';
    }

    public function model(): string
    {
        $configured = trim((string) ($this->setting('ai_model') ?? config('afia.model', '')));
        if ($configured !== '') {
            return $configured;
        }

        return $this->provider() === 'anthropic' ? 'claude-3-5-haiku-latest' : 'gpt-4o-mini';
    }

    public function apiKey(): string
    {
        $provider = $this->provider();

        $providerKey = match ($provider) {
            'anthropic' => trim((string) ($this->setting('ai_anthropic_api_key') ?? '')),
            default => trim((string) ($this->setting('ai_openai_api_key') ?? '')),
        };

        if ($providerKey !== '') {
            return $providerKey;
        }

        $shared = trim((string) ($this->setting('ai_api_key') ?? ''));
        if ($shared !== '') {
            return $shared;
        }

        return trim((string) config('afia.api_key', ''));
    }

    private function setting(string $key): mixed
    {
        if (array_key_exists($key, $this->cache)) {
            return $this->cache[$key];
        }

        try {
            if (! Schema::connection('platform')->hasTable('platform_settings')) {
                return $this->cache[$key] = null;
            }

            $setting = PlatformSetting::query()
                ->where('key', $key)
                ->where('is_active', true)
                ->first();

            return $this->cache[$key] = $setting ? ($setting->value['value'] ?? null) : null;
        } catch (\Throwable) {
            return $this->cache[$key] = null;
        }
    }
}