/**
 * QueueManager: Handles the hybrid slot logic for CuraFlow
 * - 30-min slots
 * - Max 3 online bookings (Hard Cap)
 * - 5 Walk-in slots
 */

const configManager = require('./configManager');

class QueueManager {
    constructor() {
        this.slots = {}; // Key: "YYYY-MM-DD:HH:mm"
    }

    getSlotKey(date, time) {
        // Round time to nearest slot duration
        const duration = configManager.get('slotDuration');
        const [hours, minutes] = time.split(':');
        const roundedMins = parseInt(minutes) < duration ? '00' : duration;
        return `${date}:${hours}:${roundedMins}`;
    }

    getSlotStatus(date, time) {
        const key = this.getSlotKey(date, time);
        if (!this.slots[key]) {
            this.slots[key] = { 
                online: 0, 
                walkin: 0, 
                maxOnline: configManager.get('onlineSlotLimit'), 
                maxWalkin: configManager.get('walkinSlotLimit') 
            };
        }
        return this.slots[key];
    }

    bookOnline(date, time) {
        const status = this.getSlotStatus(date, time);
        if (status.online < status.maxOnline) {
            status.online++;
            return { 
                success: true, 
                token: `ON-${status.online}`, 
                slot: this.getSlotKey(date, time),
                status: 'PENDING_PAYMENT',
                fee: configManager.get('consultationFee')
            };
        }
        return { success: false, message: "Slot full for online booking. Try next slot." };
    }

    bookWalkin(date, time) {
        const status = this.getSlotStatus(date, time);
        if (status.walkin < status.maxWalkin) {
            status.walkin++;
            return { 
                success: true, 
                token: `WK-${status.walkin}`,
                status: 'PENDING_PAYMENT',
                fee: configManager.get('consultationFee')
            };
        }
        return { success: false, message: "Clinic is at full capacity for this slot." };
    }

    getDailyUpdates(patientId) {
        // Mock data for daily updates
        return [
            "Good morning! Your appointment with Dr. Sharma is at 10:30 AM today.",
            "Queue Update: The clinic is running 10 mins behind schedule. Please plan accordingly.",
            "Reminder: Don't forget to bring your previous blood reports."
        ];
    }
}

module.exports = new QueueManager();