<?php

class PostmanCollectionParser
{
    private $collection;
    private $variables;

    public function __construct($collectionPath)
    {
        $json = file_get_contents($collectionPath);
        $this->collection = json_decode($json, true);
        $this->variables = $this->extractVariables();
    }

    public function getCollection()
    {
        return $this->collection;
    }

    public function getVariables()
    {
        return $this->variables;
    }

    private function extractVariables()
    {
        $variables = [];
        
        if (isset($this->collection['variable'])) {
            foreach ($this->collection['variable'] as $var) {
                $variables[$var['key']] = $var['value'] ?? '';
            }
        }

        return $variables;
    }

    public function getAuthConfig()
    {
        if (!isset($this->collection['auth'])) {
            return null;
        }

        $auth = $this->collection['auth'];
        
        if ($auth['type'] === 'oauth2' && isset($auth['oauth2'])) {
            $oauth2Config = [];
            
            foreach ($auth['oauth2'] as $item) {
                $oauth2Config[$item['key']] = $item['value'];
            }
            
            return [
                'type' => 'oauth2',
                'config' => $oauth2Config
            ];
        }
        
        return $auth;
    }

    public function getAllRequests()
    {
        $requests = [];
        $this->extractRequestsRecursive($this->collection, $requests);
        return $requests;
    }

    private function extractRequestsRecursive($item, &$requests, $path = '')
    {
        if (isset($item['item'])) {
            foreach ($item['item'] as $subItem) {
                $currentPath = $path ? $path . ' > ' . $subItem['name'] : $subItem['name'];
                $this->extractRequestsRecursive($subItem, $requests, $currentPath);
            }
        } elseif (isset($item['request'])) {
            $requests[] = [
                'name' => $item['name'],
                'path' => $path,
                'request' => $item['request'],
                'response' => $item['response'] ?? []
            ];
        }
    }

    public function resolveVariables($url, $customVariables = [])
    {
        $allVariables = array_merge($this->variables, $customVariables);
        
        foreach ($allVariables as $key => $value) {
            $url = str_replace('{{' . $key . '}}', $value, $url);
        }
        
        return $url;
    }

    public function getRequestById($name)
    {
        $requests = $this->getAllRequests();
        
        foreach ($requests as $request) {
            if ($request['name'] === $name) {
                return $request;
            }
        }
        
        return null;
    }
}