expenses/index.html at main · minthemiddle/expenses · GitHub

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<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <title>Shared Expense App</title>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/tailwindcss@latest/dist/tailwind.min.css">
</head>

<body class="bg-gray-100">
  <div class="container mx-auto p-4" x-data="app()" x-init="mounted()">
    <div class="mb-4 md:flex items-center md:space-x-4 space-y-4 md:space-y-0">
      <div class="flex-1">
        <label for="description" class="block text-gray-700 text-sm font-bold mb-2">Description:</label>
        <input id="description" type="text"
          class="shadow appearance-none border rounded w-full py-2 px-3 text-gray-700 leading-tight focus:outline-none focus:shadow-outline"
          x-model.trim="description" placeholder="Enter a description of the expense">
      </div>
      <div class="flex-1">
        <label for="payer" class="block text-gray-700 text-sm font-bold mb-2">Payer:</label>
        <select id="payer"
          class="shadow appearance-none border rounded w-full py-2 px-3 text-gray-700 leading-tight focus:outline-none focus:shadow-outline"
          x-model="selectedPayer">
          <option value="" disabled selected>Select the person who paid the expense</option>
          <template x-for="(person, index) in peopleList" :key="index">
            <option x-text="person" :value="person"></option>
          </template>
        </select>
      </div>
      <div class="flex-1">
        <label for="amount" class="block text-gray-700 text-sm font-bold mb-2">Amount (€):</label>
        <input id="amount" type="number" min="0" step="0.01"
          class="shadow appearance-none border rounded w-full py-2 px-3 text-gray-700 leading-tight focus:outline-none focus:shadow-outline"
          x-model.number="amount" placeholder="Enter the amount of the expense">
      </div>
    </div>
    <div class="mb-4">
      <button type="button"
        class="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline"
        @click.prevent="addExpense">Add Expense</button>
    </div>
    <div class="mb-4">
      <h2 class="text-gray-700 text-lg font-bold mb-2">Expenses:</h2>
      <ul class="list-disc list-inside space-y-2">
        <template x-for="(expense, index) in expenses" :key="index">
          <li x-text="'€' + expense.amount.toFixed(2) + ' paid by ' + expense.payer + ' for ' + expense.description">
          </li>
        </template>
      </ul>
    </div>
    <div class="mb-4">
      <h2 class="text-gray-700 text-lg font-bold mb-2">Balance:</h2>
      <ul class="list-disc list-inside space-y-2">
        <li x-text="'Total amount ' + totalAmount.toFixed(2) + '€, ' + averageAmount.toFixed(2) + '€ per person'"></li>
        <template x-for="(payment, index) in payments" :key="index">
          <li x-text="'€' + payment.amount.toFixed(2) + ' from ' + payment.from + ' to ' + payment.to"></li>
        </template>
      </ul>
    </div>
    <div class="mb-4">
      <button type="button"
        class="bg-green-500 hover:bg-green-700 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline"
        @click="recalculateBalance">Recalculate Balance</button>
    </div>

  </div>
  <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
  <script>
    function app() {
      return {
        amount: '',
        selectedPayer: '',
        description: '',
        expenses: [],
        payments: [],
        totalAmount: 0, // Add this line
        averageAmount: 0, // Add this line

        mounted() {
          if (localStorage.expenses) {
            this.expenses = JSON.parse(localStorage.expenses);
          }
          if (localStorage.payments) {
            this.payments = JSON.parse(localStorage.payments);
          }
          if (localStorage.people) {
            this.peopleList = JSON.parse(localStorage.people);
          }
          this.recalculateBalance()
        },

        updated() {
          localStorage.expenses = JSON.stringify(this.expenses);
          localStorage.payments = JSON.stringify(this.payments);
          localStorage.people = JSON.stringify(this.peopleList);
        },

        addExpense() {
          if (this.amount <= 0) {
            alert('Please enter a positive amount');
            return;
          }
          if (this.selectedPayer === '') {
            alert('Please select a payer');
            return;
          }
          if (this.description === '') {
            alert('Please enter a description');
            return;
          }
          this.expenses.push({
            amount: parseFloat(this.amount), // Parse float
            payer: this.selectedPayer,
            description: this.description
          });
          this.amount = '';
          this.selectedPayer = '';
          this.description = '';
          this.updatePayments();
          this.updateLocalStorage();
        },

        updateLocalStorage() {
          localStorage.expenses = JSON.stringify(this.expenses);
          localStorage.payments = JSON.stringify(this.payments);
          localStorage.people = JSON.stringify(this.peopleList);
        },

        recalculateBalance() {
          this.updatePayments();
          this.updateLocalStorage(); // Update local storage with recalculated balance
        },

        updatePayments() {
          this.payments = []; // Reset payments

          let balances = new Map();
          for (let person of this.peopleList) {
            balances.set(person, 0);
          }

          for (let expense of this.expenses) {
            balances.set(expense.payer, balances.get(expense.payer) + parseFloat(expense.amount));
          }

          let totalAmount = this.expenses.reduce((sum, expense) => sum + parseFloat(expense.amount), 0);
          let averageAmount = totalAmount / this.peopleList.length;

          for (let [person, balance] of balances) {
            balances.set(person, balance - averageAmount);
          }

          let debtors = [...balances.entries()].filter(([person, balance]) => balance < 0).sort((a, b) => a[1] - b[1]);
          let creditors = [...balances.entries()].filter(([person, balance]) => balance > 0).sort((a, b) => b[1] - a[1]);

          let i = 0; // Index for debtors
          let j = 0; // Index for creditors

          while (i < debtors.length && j < creditors.length) {
            let debtor = debtors[i];
            let creditor = creditors[j];
            let amount = Math.min(-debtor[1], creditor[1]);

            this.payments.push({
              from: debtor[0],
              to: creditor[0],
              amount: amount
            });

            debtor[1] += amount;
            creditor[1] -= amount;

            if (debtor[1] === 0) i++; // Move to the next debtor
            if (creditor[1] === 0) j++; // Move to the next creditor
          }

          this.totalAmount = totalAmount; // Set totalAmount
          this.averageAmount = averageAmount; // Set averageAmount
        },
      }
    }
  </script>
</body>

</html>