/**
 * PharmacyManager: Handles inventory, prescriptions, and billing.
 */

class PharmacyManager {
    constructor() {
        this.inventory = [
            { id: 'M01', name: 'Paracetamol 500mg', stock: 120, price: 5 },
            { id: 'M02', name: 'Amoxicillin 250mg', stock: 45, price: 12 },
            { id: 'M03', name: 'Cough Syrup', stock: 4, price: 85 },
            { id: 'M04', name: 'Vitamin C', stock: 200, price: 3 },
            { id: 'M05', name: 'Azithromycin', stock: 30, price: 150 },
            { id: 'M06', name: 'Insulin Glargine', stock: 12, price: 450 }
        ];
        this.pendingOrders = [
            { id: 'ORD-901', patientName: 'Rahul Verma', medicines: 'Paracetamol, Cough Syrup', status: 'PENDING', timestamp: '2026-05-13T09:15:00Z' },
            { id: 'ORD-902', patientName: 'Anjali Singh', medicines: 'Amoxicillin', status: 'READY', timestamp: '2026-05-13T09:45:00Z' }
        ]; 
    }

    getInventory() {
        return this.inventory;
    }

    addPendingOrder(patientName, medicines) {
        this.pendingOrders.push({
            id: `ORD-${Date.now()}`,
            patientName,
            medicines,
            status: 'PENDING',
            timestamp: new Date().toISOString()
        });
    }

    processOrder(orderId) {
        const order = this.pendingOrders.find(o => o.id === orderId);
        if (order) {
            order.status = 'READY';
            // In a real app, update inventory stock here
            return { success: true, message: `Order for ${order.patientName} is ready for pickup.` };
        }
        return { success: false, message: "Order not found." };
    }
}

module.exports = new PharmacyManager();