<?php
    require('../.hta_config/conf.php');

    if ($_SERVER['REQUEST_METHOD'] === 'POST' && !empty($_GET['customerId'])) {
        try {
            $db = new PDO("mysql:host=$mariaServer;dbname=$mariaDb", $mariaUser, $mariaPass);
            $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

            $totalAmount = $_POST['totalAmount'];
            $tenure = $_POST['tenure'];
            $frequency = $_POST['frequency'];
            $bookingDate = $_POST['bookingDate'];
            $paymentMode = $_POST['paymentMode'];
            $salesAgent = $_POST['salesAgent'];
            $adminNote = $_POST['adminNote'];
            $invoiceId = $_POST['invoiceId'];
            $customerName = $_POST['customerName'];
            $customerAddress = $_POST['customerAddress'];
            $marketingAgent = $_POST['marketingAgent'];
            $item = $_POST['item'];
            $description = $_POST['description'];
            $quantity = $_POST['quantity'];
            $rate = $_POST['rate'];
            $tax = $_POST['tax'];
            $taxAmount = $_POST['taxAmount'];


            // EMI Calculation
            $emiAmount = round($totalAmount / $tenure, 2);
            $outstandingAmount = $totalAmount;
            $emiDate = new DateTime($bookingDate); // Set initial date

            $stmt = $db->prepare("INSERT INTO emi (customerId, emiNumber, emiAmount, emiDate, totalAmount, outstanding, tenure, frequency, bookingDate, invoiceId) VALUES (:customerId, :emiNumber, :emiAmount, :emiDate, :totalAmount, :outstanding, :tenure, :frequency, :bookingDate, :invoiceId)");
            for ($i = 1; $i <= $tenure; $i++) {
                $outstandingAmount -= $emiAmount;
                $emiDateFormatted = $emiDate->format('Y-m-d');
                $stmt->bindParam(':customerId', $_GET['customerId']);
                $stmt->bindParam(':emiNumber', $i);
                $stmt->bindParam(':emiAmount', $emiAmount);
                $stmt->bindParam(':emiDate', $emiDateFormatted);
                $stmt->bindParam(':totalAmount', $totalAmount);
                $stmt->bindParam(':outstanding', $outstandingAmount);
                $stmt->bindParam(':tenure', $tenure);
                $stmt->bindParam(':frequency', $frequency);
                $stmt->bindParam(':bookingDate', $bookingDate);
                $stmt->bindParam(':invoiceId', $invoiceId);
                $stmt->execute();
                // Move to the next EMI date
                if (trim(strtolower($frequency)) === 'weekly') {
                    $emiDate->modify('+1 week');
                } elseif (trim(strtolower($frequency)) === 'monthly') {
                    $emiDate->modify('+1 month');
                }
            }

            // Insert into invoice table
            $stmt2 = $db->prepare("INSERT INTO invoice (customerId, invoiceId, customerName, address, frequency, invoiceDate, paymentMode, salesAgent, marketingAgent, tenure, item, description, qty, rate, tax, totalAmount, adminNote, taxAmount) VALUES (:customerId, :invoiceId, :customerName, :address, :frequency, :invoiceDate, :paymentMode, :salesAgent, :marketingAgent, :tenure, :item, :description, :qty, :rate, :tax, :totalAmount, :adminNote, :taxAmount)");
            $stmt2->bindParam(':customerId', $_GET['customerId']);
            $stmt2->bindParam(':invoiceId', $invoiceId);
            $stmt2->bindParam(':customerName', $customerName);
            $stmt2->bindParam(':address', $customerAddress);
            $stmt2->bindParam(':frequency', $frequency);
            $stmt2->bindParam(':invoiceDate', $bookingDate);
            $stmt2->bindParam(':paymentMode', $paymentMode);
            $stmt2->bindParam(':salesAgent', $salesAgent);
            $stmt2->bindParam(':marketingAgent', $marketingAgent);
            $stmt2->bindParam(':tenure', $tenure);
            $stmt2->bindParam(':item', $item);
            $stmt2->bindParam(':description', $description);
            $stmt2->bindParam(':qty', $quantity);
            $stmt2->bindParam(':rate', $rate);
            $stmt2->bindParam(':tax', $tax);
            $stmt2->bindParam(':totalAmount', $totalAmount);
            $stmt2->bindParam(':adminNote', $adminNote);
            $stmt2->bindParam(':taxAmount', $taxAmount);
            $stmt2->execute();
            
            echo '<div class="alert alert-success">New EMI Plan Saved Successfully!</div>';
            echo '<script>
                document.addEventListener("DOMContentLoaded", function() {
                    document.getElementById("printBtn").classList.remove("visually-hidden");
                });
            </script>';
        } catch (PDOException $e) {
            echo '<div class="alert alert-danger">Error: ' . $e->getMessage() . '</div>';
        }
    }
    $customer = null;
    if (!empty($_GET['customerId'])) {
        try {
            $db = new PDO("mysql:host=$mariaServer;dbname=$mariaDb", $mariaUser, $mariaPass);
            $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

            $stmt = $db->prepare("SELECT * FROM customers WHERE customerId = :customerId");
            $stmt->bindParam(':customerId', $_GET['customerId']);
            if ($stmt->execute()) {
                $customer = $stmt->fetch(PDO::FETCH_ASSOC);
            }

            $stmt = $db->prepare("SELECT * FROM address WHERE customerId = :customerId");
            $stmt->bindParam(':customerId', $_GET['customerId']);
            if ($stmt->execute()) {
                $customerAddress = $stmt->fetch(PDO::FETCH_ASSOC);
            }

            $stmt = $db->query("SELECT id FROM invoice ORDER BY id DESC LIMIT 1");
            $lastInvoice = $stmt->fetch(PDO::FETCH_ASSOC);
            $invoiceId = "ASDQ-" . ($lastInvoice ? ($lastInvoice['id'] + 1) : '1');

            $stmt = $db->query("SELECT invoiceId FROM invoice ORDER BY id DESC LIMIT 1");
            $lastInvoicePrint = $stmt->fetch(PDO::FETCH_ASSOC);
            // $invoiceIdPrint = "ASDQ-" . ($lastInvoice ? ($lastInvoice['id'] + 1) : '1');

        } catch (PDOException $e) {
            echo '<div class="alert alert-danger">Error: ' . $e->getMessage() . '</div>';
        }
    }
?>


<div class="container mt-4">
    <h4>Create New Invoice</h4>
    <hr>
    <form method="POST">
        <div class="d-flex justify-content-between gap-4">
            <div class="w-100">
                <div class="mb-3">
                    <label for="invoiceId" class="form-label">Invoice Id:</label>
                    <input type="text" class="form-control bg-white" id="invoiceId" name="invoiceId" value="<?= $invoiceId; ?>">
                </div>
                <div class="mb-3">
                    <label for="name" class="form-label">Customer:</label>
                    <input readonly type="text" class="form-control bg-white" id="customerName" name="customerName" value="<?= htmlspecialchars($customer['name']); ?>">
                </div>
                <div class="mb-3">
                    <label for="address" class="form-label">Address:</label>
                    <input id="address" readonly name="customerAddress" class="form-control bg-white" type="text" value="<?= 'City: ' . $customerAddress['city'] .' District: '. $customerAddress['district'] . ' State: ' .$customerAddress['state'] . ' Pin Code: ' . $customerAddress['pinCode']; ?>">
                </div>

                <div class="mb-3">
                    <label for="frequency" class="form-label">Frequency:</label>
                    <select name="frequency" class="form-control"required>
                        <option value="">-Select-</option>
                        <option value="Weekly">Weekly</option>
                        <option value="Monthly">Monthly</option>
                    </select>
                </div>
                <div class="d-flex w-100 gap-2">
                    <div class="mb-3 w-100">
                        <label for="bookingDate" class="form-label">Invoice Date:</label>
                        <input type="date" class="form-control" id="bookingDate" name="bookingDate" value="" required>
                    </div>
                </div>
            </div>
            <div class="w-100">
                <div class="mb-3">
                    <label for="paymentMode" class="form-label">Payment Mode:</label>
                    <select name="paymentMode" class="form-control"required>
                        <option value="">-Select-</option>
                        <option value="UPI">UPI</option>
                        <option value="Credit Card">Credit Card</option>
                        <option value="Debit Card">Debit Card</option>
                        <option value="Cash">Cash</option>
                    </select>
                </div>
                <div class="mb-3">
                    <label for="salesAgent" class="form-label">Sales Agent:</label>
                    <select name="salesAgent" class="form-control"required>
                        <option value="">-Select-</option>
                        <option value="Prabhat Mishra">Prabhat Mishra</option>
                        <option value="Suvojit Mishra">Suvojit Mishra</option>
                    </select>
                </div>
                <div class="mb-3">
                    <label for="marketingAgent" class="form-label">Marketing Agent:</label>
                    <select name="marketingAgent" class="form-control"required>
                        <option value="">-Select-</option>
                        <option value="Prabhat Mishra">Prabhat Mishra</option>
                        <option value="Suvojit Mishra">Suvojit Mishra</option>
                    </select>
                </div>
                <div class="mb-3">
                    <label for="tenure" class="form-label">Total Cycles:</label>
                    <select onchange="changeTenureField();" id="tenureAuto" name="tenure" class="form-control" required>
                        <option value="">-Select-</option>
                        <option value="1">One Time</option>
                        <option value="3">3</option>
                        <option value="6">6</option>
                        <option value="9">9</option>
                        <option value="12">12</option>
                        <option value="0">Custom</option>
                    </select>
                    <input type="text" name="tenure" id="tenureCustom" class="form-control visually-hidden" placeholder="Enter custom value" disabled onblur="restoreDropdown(this)" />
                </div>
                <div class="mb-3">
                    <label for="adminNote" class="form-label">Admin Note:</label>
                    <textarea class="form-control" name="adminNote" id="adminNote" cols="30" rows="4"></textarea>
                </div>
            </div>
        </div>
        <div>
            <table class="w-100">
                <thead>
                    <tr class="bg-secondary text-white">
                        <th class="p-2">Item</th>
                        <th class="p-2">Description</th>
                        <th class="p-2">Qty</th>
                        <th class="p-2">Rate</th>
                        <th class="p-2">Tax % </th>
                        <th class="p-2">Tax Amount</th>
                        <th class="p-2">Amount</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>
                            <textarea class="form-control w-100" name="item" id="item"  rows="3"></textarea>
                        </td>
                        <td>
                            <textarea class="form-control w-100" name="description" id="description"  rows="3"></textarea>
                        </td>
                        <td>
                            <input class="form-control w-100" name="quantity" id="quantity" />
                        </td>
                        <td>
                            <input class="form-control w-100" name="rate" id="rate" />
                        </td>
                        <td>
                            <select name="tax" id="tax" class="form-control">
                                <option value="0">No Tax</option>
                                <option value="5">5 %</option>
                                <option value="10">10 %</option>
                                <option value="12">12 %</option>
                                <option value="18">18 %</option>
                            </select>
                        </td>
                        <td>
                            <input readonly class="form-control" name="taxAmount" id="taxAmount" />
                        </td>
                        <td>
                            <input readonly class="form-control" name="totalAmount" id="totalAmount" />
                        </td>
                    </tr>
                </tbody>
            </table>
        </div>
        <div class="d-flex justify-content-end align-items-center">
            <div>
                <button class="btn btn-secondary">Discard</button>
                <button type="submit" class="btn btn-primary">Save</button>
                <a href="/customers/print-invoice/?customerId=<?= $_GET['customerId'] . '&invoiceId='. $lastInvoicePrint['invoiceId']; ?>" id="printBtn" class="btn btn-primary visually-">Print Invoice</a>
            </div>
        </div>
        
    </form>
</div>
<script>   
    const today = new Date();
    const formattedDate = today.toISOString().split('T')[0];
    document.getElementById('bookingDate').value = formattedDate;

    function changeTenureField() {
        const tenureAuto = document.getElementById('tenureAuto');
        const tenureCustom = document.getElementById('tenureCustom');

        if (tenureAuto.value === "0") { 
            tenureAuto.classList.add('visually-hidden');
            tenureCustom.classList.remove('visually-hidden');
            tenureCustom.removeAttribute('disabled'); 
            tenureAuto.setAttribute('disabled', 'true'); 
            tenureAuto.removeAttribute('name'); 
            tenureCustom.setAttribute('name', 'tenure'); 
            tenureCustom.focus();
        }
    }

    function restoreDropdown(input) {
        const tenureAuto = document.getElementById('tenureAuto');

        if (input.value.trim() === "") { 
            tenureAuto.classList.remove('visually-hidden');
            input.classList.add('visually-hidden');
            input.setAttribute('disabled', 'true'); 
            input.removeAttribute('name'); 
            tenureAuto.removeAttribute('disabled'); 
            tenureAuto.setAttribute('name', 'tenure'); 
            tenureAuto.value = ""; 
        }
    }
    document.addEventListener("DOMContentLoaded", function () {
        const quantityInput = document.getElementById("quantity");
        const rateInput = document.getElementById("rate");
        const taxSelect = document.getElementById("tax");
        const taxAmountInput = document.getElementById("taxAmount");
        const totalAmountInput = document.getElementById("totalAmount");

        function calculateTotal() {
            const quantity = parseFloat(quantityInput.value) || 0;
            const rate = parseFloat(rateInput.value) || 0;
            const tax = parseFloat(taxSelect.value) || 0;

            let subtotal = quantity * rate;
            let taxAmount = (subtotal * tax) / 100;
            let grandTotal = subtotal + taxAmount;

            taxAmountInput.value = taxAmount.toFixed(2); // Format Tax Amount
            totalAmountInput.value = grandTotal.toFixed(2); // Format Total Amount
        }

        // Event listeners for real-time calculation
        quantityInput.addEventListener("input", calculateTotal);
        rateInput.addEventListener("input", calculateTotal);
        taxSelect.addEventListener("change", calculateTotal);
    });


</script>