<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\AiModel;
use App\Models\AiProvider;
use App\Models\PromptGeneration;
use App\Models\PromptProject;
use App\Services\Ai\AiServiceFactory;
use Illuminate\Http\Client\ConnectionException;
use Illuminate\Support\Facades\Log;
use InvalidArgumentException;
use RuntimeException;

class PromptProjectService
{
    /**
     * Create a new service instance.
     */
    public function __construct(
        private readonly AiServiceFactory $aiServiceFactory,
        private readonly PromptGeneration $generationModel
    ) {
    }

    /**
     * Display a listing of the resource.
     *
     * @return array<string, mixed>
     */
    public function index(): array
    {
        $userId = auth()->id();
        $user = auth()->user();

        $query = PromptProject::with(['user', 'provider', 'model'])
            ->latest();

        if (!$user || $user->role !== 'superadmin') {
            $query->where('user_id', $userId);
        }

        $paginator = $query->paginate(15);

        return [
            'data' => $paginator->items(),
            'total' => $paginator->total(),
            'per_page' => $paginator->perPage(),
            'current_page' => $paginator->currentPage(),
            'last_page' => $paginator->lastPage(),
            'from' => $paginator->firstItem(),
            'to' => $paginator->lastItem(),
        ];
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(array $data): PromptProject
    {
        $data['examples'] = $this->convertToArray($data['examples'] ?? null);
        $data['variables'] = $this->convertToArray($data['variables'] ?? null);

        return PromptProject::create($data);
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(PromptProject $project, array $data): PromptProject
    {
        $data['examples'] = $this->convertToArray($data['examples'] ?? null);
        $data['variables'] = $this->convertToArray($data['variables'] ?? null);

        $project->update($data);

        return $project;
    }

    /**
     * Convert string to array.
     */
    private function convertToArray(mixed $value): ?array
    {
        if (is_array($value)) {
            return $value;
        }

        if (is_string($value)) {
            $value = trim($value);

            if ($value === '') {
                return null;
            }

            return array_map('trim', explode(',', $value));
        }

        return null;
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(PromptProject $project): bool
    {
        try {
            $project->delete();

            return true;
        } catch (RuntimeException $e) {
            Log::error('Failed to delete prompt project: ' . $e->getMessage());

            return false;
        }
    }

    /**
     * Generate prompt for the specified project.
     */
    public function generate(PromptProject $project, mixed $model = null, ?int $userId = null): PromptGeneration
    {
        $provider = $project->provider;

        if (!$provider instanceof AiProvider) {
            throw new InvalidArgumentException('AI provider is required for generation.');
        }

        if (!$model) {
            $model = $project->model;
        }

        if (!$model) {
            throw new InvalidArgumentException('AI model is required for generation.');
        }

        if (is_string($model)) {
            $model = AiModel::firstOrCreate(
                ['provider_id' => $provider->id, 'slug' => $model],
                ['name' => $model, 'slug' => $model, 'is_active' => true]
            );
        }

        $modelSlug = $model->slug;
        $modelId = $model->id;

        $userId ??= auth()->id();

        $promptText = $this->buildPrompt($project);

        $aiData = [
            'prompt' => $promptText,
            'temperature' => (float) ($project->temperature ?? 0.7),
            'max_tokens' => (int) ($project->max_tokens ?? 1024),
            'model' => $modelSlug,
            'api_key' => $provider->api_key,
            'base_url' => $provider->base_url,
        ];

        $startTime = microtime(true);

        try {
            $service = $this->aiServiceFactory->make($provider);
            $result = $service->generatePrompt($aiData);
        } catch (ConnectionException|RuntimeException $e) {
            Log::error('Prompt generation failed: ' . $e->getMessage());

            return $this->generationModel::create([
                'project_id' => $project->id,
                'user_id' => $userId,
                'provider_id' => $provider->id,
                'model_id' => $modelId,
                'generated_prompt' => $promptText,
                'input_data' => $aiData,
                'output_data' => ['error' => $e->getMessage()],
                'tokens_used' => null,
                'generation_time' => round(microtime(true) - $startTime, 3),
                'status' => 'failed',
            ]);
        }

        return $this->generationModel::create([
            'project_id' => $project->id,
            'user_id' => $userId,
            'provider_id' => $provider->id,
            'model_id' => $modelId,
            'generated_prompt' => $promptText,
            'input_data' => $aiData,
            'output_data' => $result,
            'tokens_used' => $result['tokens_used'] ?? null,
            'generation_time' => round(microtime(true) - $startTime, 3),
            'status' => 'completed',
        ]);
    }

    /**
     * Build the prompt text from project data.
     */
    public function buildPrompt(PromptProject $project): string
    {
        $parts = [];

        $parts[] = "You are an expert prompt engineering assistant. Your task is to generate a high-quality, optimized prompt based on the specifications provided below.";

        if ($project->company_name) {
            $parts[] = "Company Name: " . $project->company_name;
        }

        if ($project->company_address) {
            $parts[] = "Company Address: " . $project->company_address;
        }

        if ($project->company_whatsapp) {
            $parts[] = "Company WhatsApp: " . $project->company_whatsapp;
        }

        if ($project->company_website) {
            $parts[] = "Company Website: " . $project->company_website;
        }

        if ($project->company_social_media) {
            $parts[] = "Company Social Media: " . $project->company_social_media;
        }

        if ($project->company_business_activities) {
            $parts[] = "Company Business Activities: " . $project->company_business_activities;
        }

        if ($project->company_services_products) {
            $parts[] = "Company Services/Products: " . $project->company_services_products;
        }

        if ($project->objective) {
            $parts[] = "Objective: " . $project->objective;
        }

        if ($project->context) {
            $parts[] = "Context: " . $project->context;
        }

        if ($project->persona) {
            $parts[] = "Persona/Role: " . $project->persona;
        }

        if ($project->tone) {
            $parts[] = "Tone/Style: " . $project->tone;
        }

        if ($project->constraints) {
            $parts[] = "Constraints: " . $project->constraints;
        }

        if ($project->output_format) {
            $parts[] = "Output Format: " . $project->output_format;
        }

        if (!empty($project->examples)) {
            $parts[] = "Examples:\n" . json_encode($project->examples, JSON_PRETTY_PRINT);
        }

        if (!empty($project->variables)) {
            $parts[] = "Variables: " . json_encode($project->variables, JSON_PRETTY_PRINT);
        }

        $parts[] = "Generate the optimized prompt now. Return ONLY the prompt, without explanations, introductions, or additional text.";

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