<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use App\Services\LLM\ProviderFactory;

class ChatCompletionRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return true; // Authorization handled by auth middleware
    }

    /**
     * Get the validation rules that apply to the request.
     */
    public function rules(): array
    {
        return [
            'provider' => ['required', 'string', function ($attribute, $value, $fail) {
                if (!ProviderFactory::isSupported($value)) {
                    $fail("The {$attribute} must be one of: " . implode(', ', ProviderFactory::getSupportedProviders()));
                }
            }],
            'model' => 'required|string|max:100',
            'messages' => 'required|array|min:1',
            'messages.*.role' => 'required|string|in:system,user,assistant',
            'messages.*.content' => 'required|string',
            
            // Optional parameters
            'temperature' => 'sometimes|numeric|min:0|max:2',
            'max_tokens' => 'sometimes|integer|min:1|max:100000',
            'top_p' => 'sometimes|numeric|min:0|max:1',
            'frequency_penalty' => 'sometimes|numeric|min:-2|max:2',
            'presence_penalty' => 'sometimes|numeric|min:-2|max:2',
            'stop' => 'sometimes|array',
        ];
    }

    /**
     * Get custom messages for validator errors.
     */
    public function messages(): array
    {
        return [
            'provider.required' => 'Provider is required (e.g., openai, anthropic)',
            'model.required' => 'Model is required (e.g., gpt-4o-mini, claude-sonnet-4)',
            'messages.required' => 'Messages array is required',
            'messages.*.role.in' => 'Message role must be system, user, or assistant',
            'temperature.between' => 'Temperature must be between 0 and 2',
            'max_tokens.min' => 'Max tokens must be at least 1',
        ];
    }
}