<?php

declare(strict_types=1);

namespace App\Modules\Dashboard;

use App\Core\{Request, Response, Database};

final class DashboardController
{
    public function getStats(Request $request): void
    {
        $tenantId = $request->tenantId;
        $role = $request->user->role ?? 'viewer';
        $assignedCompanyId = $request->user->assigned_company_id ?? null;
        $db = Database::getInstance();

        $where = "WHERE tenant_id = ?";
        $params = [$tenantId];

        // Fix: Only accountants should be restricted to a single company if assigned.
        // Admins and Super Admins should see all companies in their tenant.
        if ($role === 'accountant' && $assignedCompanyId) {
            $where .= " AND company_id = ?";
            $params[] = $assignedCompanyId;
        }

        // 1. Total Invoices this month
        $stmt = $db->prepare("SELECT COUNT(*) as count FROM invoices {$where} AND MONTH(created_at) = MONTH(CURRENT_DATE)");
        $stmt->execute($params);
        $thisMonth = (int) $stmt->fetch()['count'];

        // 2. Approved vs Rejected
        $stmt = $db->prepare("SELECT status, COUNT(*) as count FROM invoices {$where} GROUP BY status");
        $stmt->execute($params);
        $statusCounts = $stmt->fetchAll();

        // 3. Recent Activity - Fixed ambiguity
        $stmt = $db->prepare("SELECT i.*, c.name as company_name FROM invoices i JOIN companies c ON i.company_id = c.id WHERE i.tenant_id = ? " . ($role === 'accountant' && $assignedCompanyId ? " AND i.company_id = ?" : "") . " ORDER BY i.created_at DESC LIMIT 5");
        $stmt->execute($params);
        $recent = $stmt->fetchAll();

        // 4. Calculate Subscription Usage
        $stmt = $db->prepare("SELECT max_invoices_per_month FROM subscriptions WHERE tenant_id = ?");
        $stmt->execute([$tenantId]);
        $sub = $stmt->fetch();
        $maxInvoices = (int) ($sub['max_invoices_per_month'] ?? 100);
        $usage = $maxInvoices > 0 ? round(($thisMonth / $maxInvoices) * 100, 1) : 0;

        Response::json([
            'success' => true,
            'data' => [
                'total_this_month' => $thisMonth,
                'status_distribution' => $statusCounts,
                'recent_invoices' => $recent,
                'subscription_usage' => $usage
            ]
        ]);
    }
}