@dark/pricing

Dark Pricing

TODO: calculation of defined schemas

Usage

const usePricing = require('@darkpos/pricing');

const options = {
    ...localization,
};

const pricingService = usePricing(options);

//
const newOrder = pricingService.order.calculate(oldOrder);

Sample of a calculated Item:

const item = {
    name: 'shirt',
    price: 2,
    modifiers: [
    {
        action: 'add',
        type: 'fixed',
        amount: 1
        attributes: [hidden]
        category: 'fee',
        properties: {
            sort: 1,
            included: true,
        },
        computed: {
            amount: 1
        }
    }                            ----> subTotal: 3
    {
        action: 'add',
        type: 'percentage',
        amount: 20
        category: 'tax',
        properties: {
            direct: false,
            sort: 2,
            included: true
        }
        computed: {
         amount: 0.60
        }
    }                          
    {
        action: 'add',
        type: 'percentage',
        amount: 30
        category: 'tax',
        properties: {
            direct: false,
            sort: 2,
            included: true
        }
        computed: {
         amount: 0.90
        }
    }
                                 ----> subTotal: 4.50
    {
        action: 'subtract',
        type: 'fixed',
        amount: 1
        category: 'discount'
        properties: {
            direct: false,
            sort: 3,
            included: false
        }
        computed: {
         amount: -1
        }
    }],
    subTotals: {
        tax: (included: false)                                ---> 0.60
        discount: (included: false)                           --->-1.00
        fee:                                                ---> 0.00 
        _included: (included: true)                         ---> 1
        _xincluded                                          ---> -0.40
        _direct: sum(modifiers with direct: true)           ---> 1.60 *
        _xdirect: (direct: false)                           ---> -1
        _simple: price * quantity                           ---> 2.00 *
        _actual: _simple  + _included                       ---> 3.00
    }
    total: _actual + _xincluded                             ---> 2.60
}

const order = {
    items: [item],
    modifiers: [{
        action: 'subtract',
        type: 'fixed',
        amount: 1
        attributes: [hidden]
        group: 'discount'
    }],
    subTotal: sum of _actuals                   ---> 3.00
    ---
    subTotals: {
        tax: sum of subTotals.tax                ---> 0.60
        fee: sum of subTotals.fee                ---> 0.00
        discount: sum of subTotals.discount      --->-1.00
    }
    ---
    total: sum of above                          ---> 2.60
}