Primer version funcional

views/payments/pdf_template.php

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+<style>
+    table {
+        width: 100%;
+        border-collapse: collapse;
+        font-size: 8pt;
+    }
+    th, td {
+        border: 1px solid #000;
+        padding: 4px;
+        text-align: center;
+    }
+    th {
+        background-color: #eee;
+    }
+    .print-title {
+        text-align: center;
+        font-size: 14pt;
+        margin-bottom: 10px;
+    }
+    .print-date {
+        text-align: right;
+        font-size: 8pt;
+        margin-bottom: 10px;
+    }
+    .text-danger {
+        color: red;
+    }
+    .text-success {
+        color: green;
+    }
+    .bg-success { background-color: #d4edda; }
+    .bg-warning { background-color: #fff3cd; }
+    .bg-danger { background-color: #f8d7da; }
+    .bg-secondary { background-color: #e2e3e5; }
+</style>
+
+<div class="print-title">Concentrado de Pagos de Agua - <?= $year ?></div>
+<div class="print-date">Fecha de generación: <?= date('d/m/Y H:i') ?></div>
+
+<table>
+    <thead>
+        <tr>
+            <th>Casa</th>
+            <th>Estado</th>
+            <?php foreach ($months as $month): ?>
+                <th><?= substr($month, 0, 3) ?></th>
+            <?php endforeach; ?>
+            <th>Debe/Excedente</th>
+            <th>Total</th>
+        </tr>
+    </thead>
+    <tbody>
+        <?php 
+        $grandTotal = 0;
+        $grandTotalExpected = 0;
+        foreach ($houses as $house):
+            $total = 0;
+            $totalExpected = 0;
+        ?>
+            <tr>
+                <td><strong><?= $house['number'] ?></strong></td>
+                <td><?= $house['status'] == 'activa' ? 'Activa' : 'Deshabitada' ?></td>
+                <?php foreach ($months as $month):
+                    $payment = $payments[$month][$house['id']] ?? null;
+                    $amount = $payment['amount'] ?? 0;
+                    $expected = Payment::getExpectedAmount($house, $year, $month);
+                    $total += $amount;
+                    $totalExpected += $expected;
+
+                    $bg_color = '#FFFFFF'; // Default white
+                    if ($house['status'] == 'deshabitada') {
+                        $bg_color = '#e2e3e5'; // Gris
+                    } elseif ($amount > 0) {
+                        if ($expected > 0 && $amount >= $expected) {
+                            $bg_color = '#d4edda'; // Verde
+                        } else {
+                            $bg_color = '#fff3cd'; // Amarillo
+                        }
+                    } elseif ($amount == 0 && $expected > 0) {
+                        $bg_color = '#f8d7da'; // Rojo
+                    }
+                ?>
+                    <td style="background-color: <?= $bg_color ?>;">
+                        <?= $amount > 0 ? '$' . number_format($amount, 2) : '-' ?>
+                    </td>
+                <?php endforeach; ?>
+                <?php
+                    $difference = $total - $totalExpected;
+                    $diffColor = $difference < 0 ? 'red' : 'green';
+                    $diffText = $difference == 0 ? '$0.00' : '$' . number_format($difference, 2);
+                    $grandTotal += $total;
+                    $grandTotalExpected += $totalExpected;
+                ?>
+                <td style="color: <?= $diffColor ?>;"><?= $diffText ?></td>
+                <td><strong>$<?= number_format($total, 2) ?></strong></td>
+            </tr>
+        <?php endforeach; ?>
+        <?php
+            $grandDifference = $grandTotal - $grandTotalExpected;
+            $grandDiffClass = $grandDifference < 0 ? 'text-danger' : 'text-success';
+            $grandDiffText = $grandDifference == 0 ? '$0.00' : '$' . number_format($grandDifference, 2);
+        ?>
+            <tr>
+                <td colspan="<?= count($months) + 2 ?>" style="text-align: right; font-weight: bold;">TOTALES:</td>
+                <td style="text-align: center; font-weight: bold; color: <?= $grandDiffClass == 'text-danger' ? 'red' : 'green' ?>;"><?= $grandDiffText ?></td>
+                <td style="text-align: center; font-weight: bold;">$<?= number_format($grandTotal, 2) ?></td>
+            </tr>
+    </tbody>
+</table>
+
+<div style="margin-top: 20px; font-size: 8pt; page-break-inside: avoid;">
+    <strong>Leyenda:</strong>
+    <span style="background-color: #d4edda; padding: 2px 8px; margin: 2px; border: 1px solid #ccc;">Verde = Pagado completo</span>
+    <span style="background-color: #fff3cd; padding: 2px 8px; margin: 2px; border: 1px solid #ccc;">Amarillo = Pago parcial</span>
+    <span style="background-color: #f8d7da; padding: 2px 8px; margin: 2px; border: 1px solid #ccc;">Rojo = Sin pago</span>
+    <span style="background-color: #e2e3e5; padding: 2px 8px; margin: 2px; border: 1px solid #ccc;">Gris = Casa deshabitada</span>
+</div>