eiru_pos/src/store/modules/currency.js

const state = {
    currencies: [],
    selectedCurrency: null, 
    loadingCurrencies: false,
}

const getters = {
    currencies(state) {
        return state.currencies
    },
    currencySymbols(state, { settings }) {
        if (!state.currencies || !state.selectedCurrency) {
            return []
        }

        if (settings && !settings.allowCurrencyExchange) {
            return []
        }

        return state.currencies.filter(c => state.selectedCurrency.id !== c.id).map(c => c.symbol)
    },
    baseCurrency(state) {
        return state.currencies.find(c => c.base === true)
    },
    selectedCurrency(state) {
        return state.selectedCurrency
    },
    currencySymbol(state) {
        return state.selectedCurrency && state.selectedCurrency.symbol
    },
    loadingCurrencies(state) {
        return state.loadingCurrencies
    }
}

const mutations = {
    setSelectedCurrency(state, currencySymbol) {
        if (currencySymbol) {
            state.selectedCurrency = state.currencies.find(c => c.symbol === currencySymbol)
            return
        }
        
        state.selectedCurrency = state.currencies.find(c => c.base === true)
    },
    setCurrencies(state, payload) {
        state.currencies = payload
    },
    setLoadingCurrencies(state, payload) {
        state.loadingCurrencies = !!payload
    }
}

const actions = {
    initCurrencies({ commit }, payload) {
        commit('setCurrencies', payload)
        commit('setSelectedCurrency')
        commit('setLoadingCurrencies')
    },
    resetCurrency({ commit }) {
        commit('setLoadingCurrencies', true)
        commit('setCurrencies', [])
    },
    changeCurrency({ commit, dispatch, getters }, currencySymbol) {
        commit('computePaymentInCurrency', {
            fromSymbol: getters.currencySymbol,
            toSymbol: currencySymbol
        });

        commit('setSelectedCurrency', currencySymbol)
        // commit('setInitialPayment', 0)
        // commit('setAmountResidual')

        if (getters.paymentType === 'credit') {
            dispatch('computePaymentLines')
        }

        dispatch('autoSelectJournal')
    }
}

export default {
    state,
    getters,
    mutations,
    actions
}