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264
app/composables/usePaymentCalculator.js
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264
app/composables/usePaymentCalculator.js
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// composables/usePaymentCalculator.js
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import { ref, computed } from 'vue';
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export function usePaymentCalculator() {
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// Inputs cơ bản
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const originPrice = ref(0);
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const discounts = ref([]); // [{ id, name, code, type: 1 (percent) | 2 (fixed), value: number }]
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const paymentPlan = ref([]); // [{cycle, value, type: 1 (percent) | other (fixed), days, ...}]
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const contractAllocationPercentage = ref(100);
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const startDate = ref(new Date());
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// Thanh toán sớm
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const earlyPaymentCycles = ref(0);
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const earlyDiscountRate = ref(0.0191780821918);
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// Số tiền đã thanh toán thực tế
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const paidAmount = ref(0);
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// Tiền gốc
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const originalPrice = computed(() => originPrice.value);
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// Chi tiết chiết khấu
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const detailedDiscounts = computed(() => {
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const details = [];
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let currentBalance = originPrice.value || 0;
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discounts.value.forEach(discountData => {
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const d = discountData;
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let amount = 0;
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if (d.type === 1) { // percent
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amount = (currentBalance * Number(d.value)) / 100;
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} else { // fixed
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amount = Number(d.value);
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}
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if (currentBalance - amount < 0) {
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amount = currentBalance;
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}
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currentBalance -= amount;
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details.push({
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id: d.id,
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name: d.name,
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code: d.code,
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customValue: d.value,
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customType: d.type,
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amount: amount,
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remaining: currentBalance
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});
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});
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return details;
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});
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// Tổng tiền giảm giá từ discounts
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const totalDiscount = computed(() => {
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return detailedDiscounts.value.reduce((sum, d) => sum + d.amount, 0);
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});
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// Giá sau chiết khấu
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const salePrice = computed(() => {
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const lastDiscount = detailedDiscounts.value[detailedDiscounts.value.length - 1];
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return lastDiscount ? lastDiscount.remaining : originPrice.value;
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});
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const allocatedAmount = computed(() => {
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const amount = salePrice.value * (contractAllocationPercentage.value / 100);
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return Math.round(amount / 1000) * 1000;
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});
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const finalTotal = computed(() => allocatedAmount.value);
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// Lịch thanh toán gốc (hỗ trợ cả percent và fixed cho paymentPlan.type)
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const originalPaymentSchedule = computed(() => {
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const schedule = [];
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let remaining = allocatedAmount.value;
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const sortedPlan = [...paymentPlan.value].sort((a, b) => a.cycle - b.cycle);
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let lastToDateForPeriodCalc = new Date(startDate.value); // Used to calculate the duration of each installment period.
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sortedPlan.forEach(plan => {
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let amount = 0;
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// Xử lý linh hoạt theo type của Payment_Plan
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if (plan.type === 1) {
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// percent
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amount = allocatedAmount.value * (plan.value / 100);
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} else {
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// fixed (type 2 hoặc bất kỳ giá trị khác)
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amount = plan.value || 0;
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}
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const adjustedAmount = Math.min(amount, remaining);
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remaining -= adjustedAmount;
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const fromDate = new Date(startDate.value); // Per user request, all installments start from the same date.
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const toDate = new Date(startDate.value);
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toDate.setDate(toDate.getDate() + (plan.days || 0));
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// The duration of the installment period is the difference between this installment's due date and the previous one.
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const daysInPeriod = Math.round((toDate.getTime() - lastToDateForPeriodCalc.getTime()) / (1000 * 60 * 60 * 24));
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schedule.push({
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cycle: plan.cycle,
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from_date: fromDate,
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to_date: toDate,
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amount: adjustedAmount,
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paid_amount: 0,
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remain_amount: adjustedAmount,
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days: daysInPeriod > 0 ? daysInPeriod : 0, // Use calculated period duration; it cannot be negative.
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status: 1,
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type: plan.type,
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value: plan.value,
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payment_note: `Thanh toán theo kế hoạch đợt số ${plan.cycle}`
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});
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lastToDateForPeriodCalc = new Date(toDate); // Update the last due date for the next period's duration calculation.
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});
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// Cộng phần dư (nếu có) vào đợt cuối
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if (remaining > 0 && schedule.length > 0) {
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const last = schedule[schedule.length - 1];
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last.amount += remaining;
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last.remain_amount += remaining;
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}
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return schedule;
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});
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// Chiết khấu thanh toán sớm
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const earlyDiscounts = computed(() => {
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if (earlyPaymentCycles.value <= 0) return [];
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const schedule = originalPaymentSchedule.value;
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const numEarly = Math.min(earlyPaymentCycles.value, schedule.length);
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const actualPaymentDate = new Date(startDate.value);
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const actualPaymentDateOnly = new Date(actualPaymentDate.getFullYear(), actualPaymentDate.getMonth(), actualPaymentDate.getDate());
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return schedule.slice(0, numEarly).map(item => {
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const originalDate = new Date(item.to_date);
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const originalDateOnly = new Date(originalDate.getFullYear(), originalDate.getMonth(), originalDate.getDate());
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const earlyDays = Math.round((originalDateOnly.getTime() - actualPaymentDateOnly.getTime()) / (1000 * 60 * 60 * 24));
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if (earlyDays <= 0) {
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return 0;
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}
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return item.amount * earlyDays * (earlyDiscountRate.value / 100);
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});
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});
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const totalEarlyDiscount = computed(() => {
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const rawTotal = earlyDiscounts.value.reduce((sum, disc) => sum + disc, 0);
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return parseInt(rawTotal);
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});
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// Chi tiết chiết khấu thanh toán sớm
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const earlyDiscountDetails = computed(() => {
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if (earlyPaymentCycles.value <= 0) return [];
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const schedule = originalPaymentSchedule.value;
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const numEarly = Math.min(earlyPaymentCycles.value, schedule.length);
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const actualPaymentDate = new Date(startDate.value);
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const actualPaymentDateOnly = new Date(actualPaymentDate.getFullYear(), actualPaymentDate.getMonth(), actualPaymentDate.getDate());
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return schedule.slice(0, numEarly).map((item, index) => {
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const originalDate = new Date(item.to_date);
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const originalDateOnly = new Date(originalDate.getFullYear(), originalDate.getMonth(), originalDate.getDate());
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const earlyDays = Math.round((originalDateOnly.getTime() - actualPaymentDateOnly.getTime()) / (1000 * 60 * 60 * 24));
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return {
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cycle: item.cycle,
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original_payment_date: originalDate,
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actual_payment_date: actualPaymentDate,
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early_days: earlyDays > 0 ? earlyDays : 0,
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original_amount: item.amount,
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discount_rate: earlyDiscountRate.value,
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discount_amount: earlyDiscounts.value[index] || 0,
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};
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});
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});
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// Lịch sau thanh toán sớm (gộp đợt)
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const scheduleAfterEarly = computed(() => {
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const base = originalPaymentSchedule.value;
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const numEarly = Math.min(earlyPaymentCycles.value, base.length);
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if (numEarly <= 0) return base;
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const earlyItems = base.slice(0, numEarly);
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const totalEarlyAmount = earlyItems.reduce((sum, i) => sum + i.amount, 0);
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const mergedAmount = totalEarlyAmount - totalEarlyDiscount.value;
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const originalCycles = earlyItems.map(i => i.cycle);
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const mergedItem = {
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cycle: 1,
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from_date: earlyItems[0].from_date,
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to_date: earlyItems[0].from_date, // Due date is the start date for the merged installment
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amount: Math.max(0, mergedAmount),
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paid_amount: 0,
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remain_amount: Math.max(0, mergedAmount),
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payment_note: `Thanh toán gộp đợt ${originalCycles.join(', ')} (đã trừ số tiền chiết khấu thanh toán sớm là ${totalEarlyDiscount.value})`,
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days: 0,
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status: 1,
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is_merged: true,
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original_cycles: originalCycles
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};
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const remainingItems = base.slice(numEarly).map((item, idx) => ({
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...item,
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cycle: idx + 2,
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}));
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return [mergedItem, ...remainingItems];
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});
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// Lịch thanh toán cuối cùng
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const finalPaymentSchedule = computed(() => {
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const schedule = scheduleAfterEarly.value.map(item => ({ ...item }));
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let remainingPaid = paidAmount.value || 0;
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for (let i = 0; i < schedule.length && remainingPaid > 0; i++) {
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const item = schedule[i];
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const canPay = Math.min(remainingPaid, item.remain_amount);
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item.paid_amount += canPay;
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item.remain_amount -= canPay;
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remainingPaid -= canPay;
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if (item.remain_amount <= 0) {
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item.status = 2;
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item.remain_amount = 0;
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}
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}
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return schedule;
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});
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const totalRemaining = computed(() =>
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finalPaymentSchedule.value.reduce((sum, item) => sum + item.remain_amount, 0)
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);
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return {
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originPrice,
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discounts,
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paymentPlan,
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contractAllocationPercentage,
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startDate,
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earlyPaymentCycles,
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earlyDiscountRate,
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paidAmount,
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originalPrice,
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detailedDiscounts,
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totalDiscount,
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salePrice,
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allocatedAmount,
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finalTotal,
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finalPaymentSchedule,
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originalPaymentSchedule,
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earlyDiscountDetails,
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totalEarlyDiscount,
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totalRemaining,
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};
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}
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