/**
 * Descomplicar® Crescimento Digital
 * https://descomplicar.pt
 */

<?php

defined('BASEPATH') or exit('No direct script access allowed');

/**
 * Contract Test: Moloni OAuth API
 * 
 * Tests the OAuth 2.0 integration contract with Moloni API
 * These tests MUST FAIL initially (TDD) before implementing the OAuth library
 * 
 * @package    DeskMoloni
 * @subpackage Tests\Contract
 * @version    3.0.0
 * @author     Descomplicar®
 */

class Test_Moloni_OAuth extends CI_Controller
{
    private $CI;
    private $oauth_lib;
    private $test_results = [];
    private $start_time;
    
    public function __construct()
    {
        parent::__construct();
        $this->CI = &get_instance();
        $this->start_time = microtime(true);
        
        // Load testing framework
        $this->load->helper('url');
        $this->load->database();
    }
    
    /**
     * Run all OAuth contract tests
     */
    public function run_all_tests()
    {
        echo "\n" . str_repeat("=", 80) . "\n";
        echo "MOLONI OAUTH API CONTRACT TESTS\n";
        echo "TDD: These tests MUST FAIL before implementation\n";
        echo str_repeat("=", 80) . "\n\n";
        
        try {
            // Test OAuth library loading
            $this->test_oauth_library_loading();
            
            // Test OAuth configuration
            $this->test_oauth_configuration_contract();
            
            // Test authorization URL generation
            $this->test_authorization_url_contract();
            
            // Test callback handling
            $this->test_callback_handling_contract();
            
            // Test token management
            $this->test_token_management_contract();
            
            // Test token refresh
            $this->test_token_refresh_contract();
            
            // Test API authentication
            $this->test_api_authentication_contract();
            
            // Test error handling
            $this->test_error_handling_contract();
            
            // Test security features
            $this->test_security_features_contract();
            
            // Generate final report
            $this->generate_contract_report();
            
        } catch (Exception $e) {
            echo "❌ CRITICAL ERROR: " . $e->getMessage() . "\n";
            echo "   This is EXPECTED in TDD - implement the OAuth library\n\n";
        }
    }
    
    /**
     * Test 1: OAuth Library Loading Contract
     */
    private function test_oauth_library_loading()
    {
        echo "1. 🧪 Testing OAuth Library Loading Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Library should not exist yet
            $this->CI->load->library('desk_moloni/moloni_oauth');
            $this->oauth_lib = $this->CI->moloni_oauth;
            
            $this->assert_true(
                is_object($this->oauth_lib),
                "OAuth library must be an object"
            );
            
            $this->assert_true(
                method_exists($this->oauth_lib, 'configure'),
                "OAuth library must have configure() method"
            );
            
            echo "   ✅ OAuth library loads correctly\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement Moloni_oauth library\n";
            $this->test_results['oauth_loading'] = false;
        }
    }
    
    /**
     * Test 2: OAuth Configuration Contract
     */
    private function test_oauth_configuration_contract()
    {
        echo "\n2. 🧪 Testing OAuth Configuration Contract...\n";
        
        $test_config = [
            'client_id' => 'test_client_id_12345',
            'client_secret' => 'test_client_secret_67890',
            'redirect_uri' => 'https://test.descomplicar.pt/oauth/callback',
            'use_pkce' => true
        ];
        
        try {
            // EXPECTED TO FAIL: Method doesn't exist yet
            $result = $this->oauth_lib->configure(
                $test_config['client_id'],
                $test_config['client_secret'],
                $test_config
            );
            
            $this->assert_true(
                $result === true,
                "configure() must return true on success"
            );
            
            // Test configuration retrieval
            $stored_config = $this->oauth_lib->get_configuration();
            
            $this->assert_equals(
                $test_config['client_id'],
                $stored_config['client_id'],
                "Client ID must be stored correctly"
            );
            
            echo "   ✅ OAuth configuration contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement configure() and get_configuration() methods\n";
            $this->test_results['oauth_config'] = false;
        }
    }
    
    /**
     * Test 3: Authorization URL Generation Contract
     */
    private function test_authorization_url_contract()
    {
        echo "\n3. 🧪 Testing Authorization URL Generation Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Method doesn't exist yet
            $state = 'test_state_' . uniqid();
            $auth_url = $this->oauth_lib->get_authorization_url($state);
            
            $this->assert_true(
                is_string($auth_url),
                "Authorization URL must be a string"
            );
            
            $this->assert_true(
                filter_var($auth_url, FILTER_VALIDATE_URL) !== false,
                "Authorization URL must be a valid URL"
            );
            
            $this->assert_true(
                strpos($auth_url, 'https://www.moloni.pt') === 0,
                "Authorization URL must be from Moloni domain"
            );
            
            $this->assert_true(
                strpos($auth_url, 'client_id=') !== false,
                "Authorization URL must contain client_id parameter"
            );
            
            $this->assert_true(
                strpos($auth_url, 'state=' . $state) !== false,
                "Authorization URL must contain correct state parameter"
            );
            
            echo "   ✅ Authorization URL generation contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement get_authorization_url() method\n";
            $this->test_results['auth_url'] = false;
        }
    }
    
    /**
     * Test 4: Callback Handling Contract
     */
    private function test_callback_handling_contract()
    {
        echo "\n4. 🧪 Testing Callback Handling Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Method doesn't exist yet
            $test_code = 'test_authorization_code_12345';
            $test_state = 'test_state_67890';
            
            $result = $this->oauth_lib->handle_callback($test_code, $test_state);
            
            $this->assert_true(
                is_array($result) || is_bool($result),
                "Callback handling must return array or boolean"
            );
            
            if (is_array($result)) {
                $this->assert_true(
                    isset($result['access_token']),
                    "Callback result must contain access_token"
                );
                
                $this->assert_true(
                    isset($result['expires_in']),
                    "Callback result must contain expires_in"
                );
            }
            
            echo "   ✅ Callback handling contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement handle_callback() method\n";
            $this->test_results['callback'] = false;
        }
    }
    
    /**
     * Test 5: Token Management Contract
     */
    private function test_token_management_contract()
    {
        echo "\n5. 🧪 Testing Token Management Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Methods don't exist yet
            $test_tokens = [
                'access_token' => 'test_access_token_12345',
                'refresh_token' => 'test_refresh_token_67890',
                'expires_in' => 3600,
                'token_type' => 'Bearer'
            ];
            
            // Test token storage
            $save_result = $this->oauth_lib->save_tokens($test_tokens);
            
            $this->assert_true(
                $save_result === true,
                "save_tokens() must return true on success"
            );
            
            // Test token retrieval
            $stored_token = $this->oauth_lib->get_access_token();
            
            $this->assert_equals(
                $test_tokens['access_token'],
                $stored_token,
                "Access token must be retrieved correctly"
            );
            
            // Test token validation
            $is_valid = $this->oauth_lib->is_token_valid();
            
            $this->assert_true(
                is_bool($is_valid),
                "is_token_valid() must return boolean"
            );
            
            echo "   ✅ Token management contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement token management methods\n";
            $this->test_results['token_mgmt'] = false;
        }
    }
    
    /**
     * Test 6: Token Refresh Contract
     */
    private function test_token_refresh_contract()
    {
        echo "\n6. 🧪 Testing Token Refresh Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Method doesn't exist yet
            $refresh_result = $this->oauth_lib->refresh_access_token();
            
            $this->assert_true(
                is_array($refresh_result) || is_bool($refresh_result),
                "Token refresh must return array or boolean"
            );
            
            if (is_array($refresh_result)) {
                $this->assert_true(
                    isset($refresh_result['access_token']),
                    "Refresh result must contain new access_token"
                );
            }
            
            echo "   ✅ Token refresh contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement refresh_access_token() method\n";
            $this->test_results['token_refresh'] = false;
        }
    }
    
    /**
     * Test 7: API Authentication Contract
     */
    private function test_api_authentication_contract()
    {
        echo "\n7. 🧪 Testing API Authentication Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Method doesn't exist yet
            $auth_headers = $this->oauth_lib->get_auth_headers();
            
            $this->assert_true(
                is_array($auth_headers),
                "Auth headers must be an array"
            );
            
            $this->assert_true(
                isset($auth_headers['Authorization']),
                "Auth headers must contain Authorization header"
            );
            
            $this->assert_true(
                strpos($auth_headers['Authorization'], 'Bearer ') === 0,
                "Authorization header must be Bearer token format"
            );
            
            echo "   ✅ API authentication contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement get_auth_headers() method\n";
            $this->test_results['api_auth'] = false;
        }
    }
    
    /**
     * Test 8: Error Handling Contract
     */
    private function test_error_handling_contract()
    {
        echo "\n8. 🧪 Testing Error Handling Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Method doesn't exist yet
            
            // Test invalid configuration
            $invalid_result = $this->oauth_lib->configure('', '');
            
            $this->assert_true(
                $invalid_result === false,
                "Invalid configuration must return false"
            );
            
            // Test error reporting
            $last_error = $this->oauth_lib->get_last_error();
            
            $this->assert_true(
                is_string($last_error) || is_array($last_error),
                "Last error must be string or array"
            );
            
            echo "   ✅ Error handling contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement error handling methods\n";
            $this->test_results['error_handling'] = false;
        }
    }
    
    /**
     * Test 9: Security Features Contract
     */
    private function test_security_features_contract()
    {
        echo "\n9. 🧪 Testing Security Features Contract...\n";
        
        try {
            // EXPECTED TO FAIL: Methods don't exist yet
            
            // Test PKCE support
            $pkce_supported = $this->oauth_lib->supports_pkce();
            
            $this->assert_true(
                is_bool($pkce_supported),
                "PKCE support check must return boolean"
            );
            
            // Test state validation
            $state_validation = $this->oauth_lib->validate_state('test_state');
            
            $this->assert_true(
                is_bool($state_validation),
                "State validation must return boolean"
            );
            
            // Test token encryption
            $tokens_encrypted = $this->oauth_lib->are_tokens_encrypted();
            
            $this->assert_true(
                is_bool($tokens_encrypted),
                "Token encryption check must return boolean"
            );
            
            echo "   ✅ Security features contract satisfied\n";
            
        } catch (Exception $e) {
            echo "   ❌ EXPECTED FAILURE: " . $e->getMessage() . "\n";
            echo "   📝 TODO: Implement security feature methods\n";
            $this->test_results['security'] = false;
        }
    }
    
    /**
     * Generate Contract Test Report
     */
    private function generate_contract_report()
    {
        $execution_time = microtime(true) - $this->start_time;
        
        echo "\n" . str_repeat("=", 80) . "\n";
        echo "MOLONI OAUTH CONTRACT TEST REPORT\n";
        echo str_repeat("=", 80) . "\n";
        
        $passed_tests = array_filter($this->test_results, function($result) {
            return $result === true;
        });
        
        $failed_tests = array_filter($this->test_results, function($result) {
            return $result === false;
        });
        
        echo "Execution Time: " . number_format($execution_time, 2) . "s\n";
        echo "Tests Passed: " . count($passed_tests) . "\n";
        echo "Tests Failed: " . count($failed_tests) . " (EXPECTED in TDD)\n";
        
        if (count($failed_tests) > 0) {
            echo "\n🔴 TDD STATUS: TESTS FAILING AS EXPECTED\n";
            echo "Next Step: Implement Moloni_oauth library to make tests pass\n";
            
            echo "\nFailed Test Categories:\n";
            foreach ($failed_tests as $test => $result) {
                echo "   ❌ " . ucwords(str_replace('_', ' ', $test)) . "\n";
            }
        } else {
            echo "\n🟢 ALL TESTS PASSING\n";
            echo "OAuth implementation appears to be complete\n";
        }
        
        echo "\n📋 IMPLEMENTATION REQUIREMENTS:\n";
        echo "   1. Create libraries/Moloni_oauth.php\n";
        echo "   2. Implement class Moloni_oauth with required methods\n";
        echo "   3. Support OAuth 2.0 with PKCE\n";
        echo "   4. Secure token storage with encryption\n";
        echo "   5. Comprehensive error handling\n";
        echo "   6. State validation for security\n";
        
        // Save test results
        $this->save_contract_results();
    }
    
    /**
     * Save contract test results
     */
    private function save_contract_results()
    {
        $results = [
            'timestamp' => date('Y-m-d H:i:s'),
            'test_type' => 'oauth_contract',
            'status' => count(array_filter($this->test_results)) > 0 ? 'passing' : 'failing',
            'results' => $this->test_results,
            'execution_time' => microtime(true) - $this->start_time
        ];
        
        $reports_dir = __DIR__ . '/../reports';
        if (!is_dir($reports_dir)) {
            mkdir($reports_dir, 0755, true);
        }
        
        $report_file = $reports_dir . '/oauth_contract_test_' . date('Y-m-d_H-i-s') . '.json';
        file_put_contents($report_file, json_encode($results, JSON_PRETTY_PRINT));
        
        echo "\n📄 Contract test results saved to: {$report_file}\n";
    }
    
    // ========================================================================
    // HELPER ASSERTION METHODS
    // ========================================================================
    
    private function assert_true($condition, $message)
    {
        if (!$condition) {
            throw new Exception("Assertion failed: {$message}");
        }
    }
    
    private function assert_equals($expected, $actual, $message)
    {
        if ($expected !== $actual) {
            throw new Exception("Assertion failed: {$message}. Expected: {$expected}, Actual: {$actual}");
        }
    }
}

// Run the contract tests if called directly
if (basename(__FILE__) === basename($_SERVER['SCRIPT_NAME'])) {
    $test = new Test_Moloni_OAuth();
    $test->run_all_tests();
}