feat: implemented bill splitting type equal version 1

src/controllers/splitLogicController.js

@@ -0,0 +1,53 @@
+const validateBillSplit = require('../helpers/validateBillsplitInputs');
+
+module.exports.splitBill = async (req, res) => {
+  // Step 1. Get the bare split equal done
+  const { description, amount, paidBy, splitType, selectedMemeber } = req.body;
+  if (!description || !amount || !paidBy || !splitType || !selectedMemeber) {
+    return res.status(400).json({ message: 'All fields are required' });
+  }
+
+  // type Checking
+  const validateInput = validateBillSplit(req.body);
+  if (!validateInput.isValid) {
+    return res
+      .status(400)
+      .json({ message: 'Invalid input types', errors: validateBillSplit.errors });
+  }
+
+  //Bill splitting logics
+  try {
+    const paidUsers = [];
+
+    // Type 1: splitType === 'EQUAL'
+    if (splitType === 'EQUAL') {
+      let membersInex = [...selectedMembers];
+
+      // If paidBy should be included and isn't already in the array
+      if (isPaidByIncluded && !membersInex.includes(paidBy)) {
+        membersInex.push(paidBy);
+      }
+
+      // Calculate split amount
+      const toEachMem = Number(amount / membersInex.length);
+      const eachShare = Math.round(toEachMem * 10) / 10;
+
+      // Show who owes what
+      membersInex.forEach((mem) => {
+        if (mem === paidBy) {
+          console.log(`${mem} paid Rs. ${amount} and owes Rs. ${eachShare}`);
+        } else {
+          console.log(`${mem} has to pay Rs. ${eachShare} to ${paidBy}`);
+        }
+      });
+
+      return {
+        paymentType: 'EQUAL',
+        totalAmount: amount,
+        perPersonShare: eachShare,
+        paidBy,
+        participants: membersInex,
+      };
+    }
+  } catch (error) {}
+};

src/helpers/validateBillsplitInputs.js

@@ -0,0 +1,31 @@
+const validateBarterPayInput = (data) => {
+  const errors = [];
+
+  if (typeof data.description !== 'string' || !data.description.trim()) {
+    errors.push('Description must be a non-empty string');
+  }
+
+  if (typeof data.amount !== 'number' || data.amount <= 0) {
+    errors.push('Amount must be a greater than 0');
+  }
+
+  if (typeof data.paidBy !== 'string' || !data.paidBy.trim()) {
+    errors.push('PaidBy must be a non-empty string');
+  }
+
+  if (
+    typeof data.splitType !== 'string' ||
+    !['EQUAL', 'CUSTOM'].includes(data.splitType.toUpperCase())
+  ) {
+    errors.push('Invalid splitType');
+  }
+
+  if (!Array.isArray(data.selectedMemeber) || data.selectedMemeber.length === 0) {
+    errors.push('selectedMemeber must be a non-empty array');
+  }
+
+  return {
+    isValid: errors.length === 0,
+    errors,
+  };
+};