import { BillingLocation, BilledTo, BillsNotificationStatus, BillsNotificationStrategy } from '@evidencija-rezija/shared-code';

/**
 * Checks if billsNotificationStatus should be updated to `Scheduled` based on attachment status
 * @param location - The billing location containing the bill
 * @param currentBillId - The ID of the bill being updated (to exclude from check)
 * @param hasNewAttachment - Whether a new attachment is being added to the current bill
 * @returns true if billsNotificationStatus should be set to `Scheduled`
 */
export const shouldUpdateBillsNotificationStatusWhenAttached = (
    location: BillingLocation,
    currentBillId: string | undefined,
    hasNewAttachment: boolean
): boolean => {
    // Only proceed if a new attachment is being added
    if (!hasNewAttachment) {
        return false;
    }

    // Check billsNotificationEnabled is true
    if (location.billsNotificationEnabled !== true) {
        return false;
    }

    // Check billsNotificationStrategy is `WhenAttached`
    if (location.billsNotificationStrategy !== BillsNotificationStrategy.WhenAttached) {
        return false;
    }

    // Check bills have already been sent or are scheduled -> don't send them again
    if (location.billsNotificationStatus === BillsNotificationStatus.Scheduled || location.billsNotificationStatus === BillsNotificationStatus.Sent) {
        return false;
    }

    // Check if ALL other bills have attachments
    const otherBills = location.bills.filter(bill => bill._id !== currentBillId);
    // filter only bills billed to tenant
    // because bills billed to landlord should not trigger forwarding
    const billsPayedByTenant = otherBills.filter(bill => bill.billedTo === BilledTo.Tenant);

    if(billsPayedByTenant.length === 0) {
        // No other bills billed to tenant exist, so do not trigger forwarding
        return false;
    }

    const allOtherBillsHaveAttachments = billsPayedByTenant.every(bill => bill.attachment !== null);

    return allOtherBillsHaveAttachments;
};

/**
 * Checks if billsNotificationStatus should be updated to "scheduled" based on paid status
 * @param location - The billing location containing the bill
 * @param currentBillId - The ID of the bill being updated (to exclude from check)
 * @param isPaid - Whether the current bill is being marked as paid
 * @returns true if billsNotificationStatus should be set to "scheduled"
 */
export const shouldUpdateBillsNotificationStatusWhenPayed = (
    location: BillingLocation,
    currentBillId: string | undefined,
    isPaid: boolean
): boolean => {
    // Only proceed if the bill is being marked as paid
    if (!isPaid) {
        return false;
    }

    // Check billsNotificationEnabled is true
    if (location.billsNotificationEnabled !== true) {
        return false;
    }

    // Check billsNotificationStrategy is `WhenPayed`
    if (location.billsNotificationStrategy !== BillsNotificationStrategy.WhenPayed) {
        return false;
    }

    // Check bills have already been sent or are scheduled -> don't sent them again
    if (location.billsNotificationStatus === BillsNotificationStatus.Scheduled || location.billsNotificationStatus === BillsNotificationStatus.Sent) {
        return false;
    }

    // Check if ALL other bills are paid
    const otherBills = location.bills.filter(bill => bill._id !== currentBillId);
    // filter only bills billed to tenant
    // because bills billed to landlord should not trigger forwarding
    const billsPayedByTenant = otherBills.filter(bill => bill.billedTo === BilledTo.Tenant);

    if(billsPayedByTenant.length === 0) {
        // No other bills billed to tenant exist, so do not trigger forwarding
        return false;
    }

    const allOtherBillsPaid = billsPayedByTenant.every(bill => bill.paid === true);

    return allOtherBillsPaid;
};