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

<?php

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

/**
 * Desk-Moloni Client Portal Controller
 * 
 * Provides client-facing API endpoints for portal access and data management
 * Handles authentication, data access, and client-specific operations
 * 
 * @package    DeskMoloni
 * @subpackage Controllers
 * @version    3.0.0
 * @author     Descomplicar®
 */
class ClientPortal extends ClientsController
{
    private $client_id;
    
    /**
     * Constructor - Initialize libraries and models
     */
    public function __construct()
    {
        parent::__construct();
        
        // Set JSON content type for API responses
        $this->output->set_content_type('application/json');
        
        // Load required libraries
        $this->load->library('desk_moloni/moloni_api_client');
        $this->load->library('desk_moloni/client_sync_service');
        
        // Load required models
        $this->load->model('desk_moloni/desk_moloni_config_model', 'config_model');
        $this->load->model('desk_moloni/desk_moloni_sync_log_model', 'sync_log_model');
        $this->load->model('clients_model', 'client_model');
        $this->load->model('invoices_model', 'invoice_model');
        
        // Validate client session (required)
        $this->validate_client_session();
    }
    
    /**
     * Validate CSRF token for POST/PUT/DELETE requests
     */
    private function validate_csrf_token(): bool
    {
        $method = $this->input->method();
        if (in_array($method, ['POST', 'PUT', 'DELETE'])) {
            $tokenName = $this->security->get_csrf_token_name();
            $token = $this->input->get_post($tokenName);
            $hash = $this->security->get_csrf_hash();
            if (!$token || !$hash || !hash_equals($hash, $token)) {
                $this->set_error_response('CSRF token validation failed', 403);
                return false;
            }
        }
        return true;
    }
    
    /**
     * Validate client data access permissions
     */
    private function validate_data_access(?int $requested_client_id = null): bool
    {
        // If specific client ID requested, validate access
        if ($requested_client_id !== null) {
            if (!$this->client_id || $this->client_id != $requested_client_id) {
                $this->set_error_response('Access denied - You can only access your own data', 403);
                return false;
            }
        }
        return true;
    }
    
    /**
     * Validate input data with sanitization and rate limiting
     */
    private function validate_and_sanitize(array $data, array $rules = []): array
    {
        // Rate limiting check (simplified)
        $this->check_rate_limit();
        
        $sanitized = [];
        
        foreach ($data as $key => $value) {
            if ($value === null) {
                $sanitized[$key] = null;
                continue;
            }
            
            // Basic XSS protection
            $sanitized[$key] = $this->security->xss_clean($value);
            
            // Apply validation rules
            if (isset($rules[$key])) {
                $rule = $rules[$key];
                
                if (isset($rule['required']) && $rule['required'] && empty($sanitized[$key])) {
                    throw new Exception("Field {$key} is required");
                }
                
                if (!empty($sanitized[$key]) && isset($rule['type'])) {
                    switch ($rule['type']) {
                        case 'email':
                            if (!filter_var($sanitized[$key], FILTER_VALIDATE_EMAIL)) {
                                throw new Exception("Invalid email format");
                            }
                            break;
                        case 'int':
                            if (!filter_var($sanitized[$key], FILTER_VALIDATE_INT)) {
                                throw new Exception("Invalid number format");
                            }
                            $sanitized[$key] = (int) $sanitized[$key];
                            break;
                    }
                }
                
                if (isset($rule['max_length']) && strlen($sanitized[$key]) > $rule['max_length']) {
                    throw new Exception("Input too long");
                }
            }
        }
        
        return $sanitized;
    }
    
    /**
     * Simple rate limiting check
     */
    private function check_rate_limit(): void
    {
        $client_ip = $this->input->ip_address();
        $cache_key = 'rate_limit_' . md5($client_ip . '_' . ($this->client_id ?? 'anonymous'));
        
        // Allow 60 requests per minute per client
        $current_requests = $this->cache->get($cache_key) ?? 0;
        
        if ($current_requests >= 60) {
            $this->set_error_response('Rate limit exceeded. Please try again later.', 429);
            exit;
        }
        
        $this->cache->save($cache_key, $current_requests + 1, 60);
    }
    
    // =======================================================================
    // Authentication & Session Endpoints
    // =======================================================================
    
    /**
     * Client authentication endpoint
     * POST /client_portal/desk_moloni/client_login
     */
    public function client_login(): void
    {
        if ($this->input->method() !== 'POST') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        // Validate CSRF token
        if (!$this->validate_csrf_token()) {
            return;
        }
        
        try {
            // Validate and sanitize input
            $input_data = [
                'email' => $this->input->post('email', true),
                'password' => $this->input->post('password', true)
            ];
            
            $validation_rules = [
                'email' => ['required' => true, 'type' => 'email', 'max_length' => 255],
                'password' => ['required' => true, 'max_length' => 255]
            ];
            
            $sanitized = $this->validate_and_sanitize($input_data, $validation_rules);
            
            // Log login attempt
            log_message('info', 'Client login attempt for email: ' . $sanitized['email']);
            
            // Authentication logic would go here
            $this->set_success_response([
                'message' => 'Client login endpoint - implementation in progress',
                'authenticated' => false
            ]);
            
        } catch (Exception $e) {
            // Log failed login attempt with IP
            $error_context = [
                'method' => __METHOD__,
                'ip_address' => $this->input->ip_address(),
                'user_agent' => $this->input->user_agent(),
                'error' => $e->getMessage()
            ];
            log_message('error', 'Client login error: ' . json_encode($error_context));
            
            $this->set_error_response('Authentication failed', 401);
        }
    }
    
    /**
     * Client logout endpoint
     * POST /client_portal/desk_moloni/client_logout
     */
    public function client_logout(): void
    {
        if ($this->input->method() !== 'POST') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Client logout endpoint - implementation in progress']);
    }
    
    /**
     * Session validation endpoint
     * GET /client_portal/desk_moloni/client_session_check
     */
    public function client_session_check(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Session check endpoint - implementation in progress']);
    }
    
    /**
     * Password reset endpoint
     * POST /client_portal/desk_moloni/client_password_reset
     */
    public function client_password_reset(): void
    {
        if ($this->input->method() !== 'POST') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Password reset endpoint - implementation in progress']);
    }
    
    // =======================================================================
    // Dashboard & Overview Endpoints
    // =======================================================================
    
    /**
     * Client dashboard data
     * GET /client_portal/desk_moloni/dashboard
     */
    public function dashboard(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Dashboard endpoint - implementation in progress']);
    }
    
    /**
     * Current sync status for client
     * GET /client_portal/desk_moloni/sync_status
     */
    public function sync_status(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Sync status endpoint - implementation in progress']);
    }
    
    /**
     * Recent sync activity log
     * GET /client_portal/desk_moloni/recent_activity
     */
    public function recent_activity(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Recent activity endpoint - implementation in progress']);
    }
    
    /**
     * Summary of sync errors
     * GET /client_portal/desk_moloni/error_summary
     */
    public function error_summary(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Error summary endpoint - implementation in progress']);
    }
    
    // =======================================================================
    // Invoice Management Endpoints
    // =======================================================================
    
    /**
     * Get client invoices list
     * GET /client_portal/desk_moloni/get_invoices
     */
    public function get_invoices(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Get invoices endpoint - implementation in progress']);
    }
    
    /**
     * Get specific invoice details
     * GET /client_portal/desk_moloni/get_invoice_details
     */
    public function get_invoice_details(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Invoice details endpoint - implementation in progress']);
    }
    
    /**
     * Download invoice PDF
     * GET /client_portal/desk_moloni/download_invoice
     */
    public function download_invoice(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Download invoice endpoint - implementation in progress']);
    }
    
    /**
     * Manual invoice sync trigger
     * POST /client_portal/desk_moloni/sync_invoice
     */
    public function sync_invoice(): void
    {
        if ($this->input->method() !== 'POST') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Sync invoice endpoint - implementation in progress']);
    }
    
    // =======================================================================
    // Client Data Management Endpoints
    // =======================================================================
    
    /**
     * Get client profile data
     * GET /client_portal/desk_moloni/get_client_data
     */
    public function get_client_data(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Get client data endpoint - implementation in progress']);
    }
    
    /**
     * Update client information
     * PUT /client_portal/desk_moloni/update_client_data
     */
    public function update_client_data(): void
    {
        if ($this->input->method() !== 'PUT') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Update client data endpoint - implementation in progress']);
    }
    
    /**
     * Get sync preferences
     * GET /client_portal/desk_moloni/get_sync_preferences
     */
    public function get_sync_preferences(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Get sync preferences endpoint - implementation in progress']);
    }
    
    /**
     * Update sync preferences
     * PUT /client_portal/desk_moloni/update_sync_preferences
     */
    public function update_sync_preferences(): void
    {
        if ($this->input->method() !== 'PUT') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Update sync preferences endpoint - implementation in progress']);
    }
    
    // =======================================================================
    // Reports & Analytics Endpoints
    // =======================================================================
    
    /**
     * Get synchronization report
     * GET /client_portal/desk_moloni/get_sync_report
     */
    public function get_sync_report(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Sync report endpoint - implementation in progress']);
    }
    
    /**
     * Get revenue analytics
     * GET /client_portal/desk_moloni/get_revenue_report
     */
    public function get_revenue_report(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Revenue report endpoint - implementation in progress']);
    }
    
    /**
     * Export client data
     * GET /client_portal/desk_moloni/export_data
     */
    public function export_data(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Export data endpoint - implementation in progress']);
    }
    
    /**
     * Get invoice statistics
     * GET /client_portal/desk_moloni/get_invoice_stats
     */
    public function get_invoice_stats(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Invoice stats endpoint - implementation in progress']);
    }
    
    // =======================================================================
    // Support & Help Endpoints
    // =======================================================================
    
    /**
     * Submit support request
     * POST /client_portal/desk_moloni/submit_support_ticket
     */
    public function submit_support_ticket(): void
    {
        if ($this->input->method() !== 'POST') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Submit support ticket endpoint - implementation in progress']);
    }
    
    /**
     * Get client support tickets
     * GET /client_portal/desk_moloni/get_support_tickets
     */
    public function get_support_tickets(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Get support tickets endpoint - implementation in progress']);
    }
    
    /**
     * Get help documentation
     * GET /client_portal/desk_moloni/get_help_resources
     */
    public function get_help_resources(): void
    {
        if ($this->input->method() !== 'GET') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Get help resources endpoint - implementation in progress']);
    }
    
    /**
     * Contact support form
     * POST /client_portal/desk_moloni/contact_support
     */
    public function contact_support(): void
    {
        if ($this->input->method() !== 'POST') {
            $this->set_error_response('Method not allowed', 405);
            return;
        }
        
        $this->set_success_response(['message' => 'Contact support endpoint - implementation in progress']);
    }
    
    // =======================================================================
    // Helper Methods
    // =======================================================================
    
    /**
     * Validate client session
     */
    private function validate_client_session(): bool
    {
        // Require authenticated client session
        $this->client_id = $this->session->userdata('client_user_id') ?? $this->session->userdata('client_id') ?? null;
        if (!$this->client_id) {
            $this->set_error_response('Authentication required', 401);
            exit;
        }
    }
    
    /**
     * Set success response format
     * 
     * @param array $data Response data
     */
    private function set_success_response(mixed $data): void
    {
        $this->output
            ->set_status_header(200)
            ->set_output(json_encode([
                'success' => true,
                'data' => $data,
                'client_id' => $this->client_id
            ]));
    }
    
    /**
     * Set error response format
     * 
     * @param string $message Error message
     * @param int $status_code HTTP status code
     */
    private function set_error_response(string $message, int $status_code = 400): void
    {
        $this->output
            ->set_status_header($status_code)
            ->set_output(json_encode([
                'success' => false,
                'error' => [
                    'message' => $message,
                    'code' => $status_code,
                    'timestamp' => date('Y-m-d H:i:s')
                ]
            ]));
    }
}