<?php

declare(strict_types=1);

namespace App\Actions;

use App\Services\FileStorage;
use Exception;

class ProjectActions
{
	private FileStorage $storage;

	public function __construct()
	{
		$this->storage = new FileStorage();
	}

	/**
	 * Initializes a new user session.
	 */
	public function initSession(): array
	{
		$userId = 'u_' . bin2hex(random_bytes(8));
		$userData = [
			'user_id' => $userId,
			'created_at' => date('c'),
			'projects' => []
		];

		$this->storage->put("users/{$userId}.json", $userData);

		return ['user_id' => $userId];
	}

	/**
	 * Creates a new project for a user.
	 */
	public function createProject(string $userId): array
	{
		$userPath = "users/{$userId}.json";
		$userData = $this->storage->get($userPath);

		if (!$userData) {
			throw new Exception("User not found.", 404);
		}

		$projectId = 'p_' . bin2hex(random_bytes(8));
		$projectData = [
			'project_id' => $projectId,
			'user_id' => $userId,
			'status' => 'draft',
			'current_step' => 1,
			'wizard_data' => [
				'identity' => [],
				'contact' => [],
				'services' => [],
				'visuals' => [],
				'modules' => [],
				'assets' => [],
				'language' => [],
				'business_category' => [],
				'smart_answers' => []
			],
			'created_at' => date('c'),
			'updated_at' => date('c')
		];

		$this->storage->put("projects/{$projectId}.json", $projectData);

		// Update user's project list
		$userData['projects'][] = $projectId;
		$this->storage->put($userPath, $userData);

		return $projectData;
	}

	/**
	 * Lists all projects for a user.
	 */
	public function listProjects(string $userId): array
	{
		$userData = $this->storage->get("users/{$userId}.json");

		if (!$userData) {
			throw new Exception("User not found.", 404);
		}

		$projects = [];
		foreach ($userData['projects'] as $projectId) {
			$projectData = $this->storage->get("projects/{$projectId}.json");
			if ($projectData) {
				$projects[] = [
					'project_id' => $projectData['project_id'],
					'status' => $projectData['status'],
					'business_name' => $projectData['wizard_data']['identity']['business_name'] ?? 'Unnamed Project',
					'created_at' => $projectData['created_at'],
					'updated_at' => $projectData['updated_at']
				];
			}
		}

		return $projects;
	}

	/**
	 * Returns full project data.
	 */
	public function getProjectStatus(string $userId, string $projectId): array
	{
		$projectData = $this->storage->get("projects/{$projectId}.json");

		if (!$projectData) {
			throw new Exception("Project not found.", 404);
		}

		if ($projectData['user_id'] !== $userId) {
			throw new Exception("Unauthorized access to project.", 403);
		}

		return $projectData;
	}

	/**
	 * Saves data for a specific wizard step.
	 */
	public function saveStep(string $userId, string $projectId, int $step, array $data): bool
	{
		$projectPath = "projects/{$projectId}.json";
		$projectData = $this->getProjectStatus($userId, $projectId);

		switch ($step) {
			case 1:
				if (!isset($data['business_category'])) {
					throw new Exception("Missing business_category data.", 400);
				}
				$projectData['wizard_data']['business_category'] = $data['business_category'];
				break;
			
			// More steps will be added later
		}

		$projectData['current_step'] = max($projectData['current_step'], $step + 1);
		$projectData['updated_at'] = date('c');

		return $this->storage->put($projectPath, $projectData);
	}
}