Implement clickable CA-3 lines with detailed account breakdown

Features added:
- New getCA3LineDetails() method in DeclarationTVA class
- New declarationtva_line_details.php page for detailed view
- All CA-3 line codes are now clickable in declaration view
- Detailed breakdown shows:
  * Account codes and labels
  * Base amounts, VAT amounts, total amounts
  * Mapping types (A1, 08_BASE, 08_VAT, etc.)
  * Calculated totals vs account totals
- Added comprehensive translations for detailed view
- Navigation breadcrumbs and back buttons
- Professional styling with Dolibarr UI components

This provides complete transparency into which accounts contribute to each CA-3 line without touching the calculation logic.

core/class/declarationtva.class.php

@@ -855,4 +855,95 @@ class DeclarationTVA
         
         return $this->calculateCA3Amounts($declaration_id, $period);
     }
+
+    /**
+     * Get detailed account breakdown for a specific CA-3 line
+     *
+     * @param int $declaration_id Declaration ID
+     * @param string $ca3_line CA-3 line code (e.g., 'A1', '08', '09', etc.)
+     * @return array Detailed breakdown with accounts and amounts
+     */
+    public function getCA3LineDetails($declaration_id, $ca3_line)
+    {
+        // Get declaration dates
+        $sql = "SELECT start_date, end_date FROM " . MAIN_DB_PREFIX . "declarationtva_declarations 
+                WHERE rowid = " . (int)$declaration_id . " AND entity = " . $this->entity;
+        
+        $result = $this->db->query($sql);
+        if (!$result || $this->db->num_rows($result) == 0) {
+            return array();
+        }
+        
+        $obj = $this->db->fetch_object($result);
+        $start_date = $obj->start_date;
+        $end_date = $obj->end_date;
+        
+        // Get account mappings for this CA-3 line
+        $mappings = $this->getAccountMappings();
+        $line_mappings = array();
+        
+        // Find mappings for this specific line
+        foreach ($mappings as $mapping) {
+            if ($mapping['ca3_line'] == $ca3_line) {
+                $line_mappings[] = $mapping;
+            }
+        }
+        
+        $details = array();
+        $total_base = 0;
+        $total_vat = 0;
+        $total_amount = 0;
+        
+        // Process each mapped account
+        foreach ($line_mappings as $mapping) {
+            $account_code = $mapping['account_code'];
+            $account_label = $mapping['account_label'];
+            
+            // Get account amounts for this period
+            $amounts = $this->getAccountAmounts($account_code, $start_date, $end_date);
+            
+            $account_detail = array(
+                'account_code' => $account_code,
+                'account_label' => $account_label,
+                'base_amount' => $amounts['base_amount'],
+                'vat_amount' => $amounts['vat_amount'],
+                'total_amount' => $amounts['total_amount'],
+                'mapping_type' => $mapping['ca3_line'] // Will be 'A1', '08_BASE', '08_VAT', etc.
+            );
+            
+            $details[] = $account_detail;
+            
+            // Accumulate totals
+            $total_base += $amounts['base_amount'];
+            $total_vat += $amounts['vat_amount'];
+            $total_amount += $amounts['total_amount'];
+        }
+        
+        // Get the calculated line total from CA-3 lines table
+        $sql_line = "SELECT base_amount, vat_amount, total_amount, line_label 
+                     FROM " . MAIN_DB_PREFIX . "declarationtva_ca3_lines 
+                     WHERE declaration_id = " . (int)$declaration_id . " 
+                     AND ca3_line = '" . $this->db->escape($ca3_line) . "'";
+        
+        $result_line = $this->db->query($sql_line);
+        $calculated_line = null;
+        if ($result_line && $this->db->num_rows($result_line) > 0) {
+            $calculated_line = $this->db->fetch_object($result_line);
+        }
+        
+        return array(
+            'ca3_line' => $ca3_line,
+            'declaration_id' => $declaration_id,
+            'start_date' => $start_date,
+            'end_date' => $end_date,
+            'account_details' => $details,
+            'calculated_line' => $calculated_line,
+            'totals' => array(
+                'base_amount' => $total_base,
+                'vat_amount' => $total_vat,
+                'total_amount' => $total_amount
+            ),
+            'account_count' => count($details)
+        );
+    }
 }

declarationtva_line_details.php

@@ -0,0 +1,183 @@
+<?php
+/**
+ * DeclarationTVA Line Details Page
+ * Shows detailed breakdown of accounts for a specific CA-3 line
+ */
+
+// Load Dolibarr environment
+if (file_exists('../main.inc.php')) {
+    $res = @include '../main.inc.php';
+} elseif (file_exists('../../main.inc.php')) {
+    $res = @include '../../main.inc.php';
+} elseif (file_exists('../../../main.inc.php')) {
+    $res = @include '../../../main.inc.php';
+} else {
+    die("Include of main fails");
+}
+
+// Load module classes
+require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva.class.php';
+require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva_config.class.php';
+
+// Access control
+if (!$user->hasRight("declarationtva", "declarationtva", "read")) {
+    accessforbidden();
+}
+
+// Get parameters
+$declaration_id = GETPOST('declaration_id', 'int');
+$ca3_line = GETPOST('ca3_line', 'alpha');
+
+// Validate parameters
+if (empty($declaration_id) || empty($ca3_line)) {
+    setEventMessages($langs->trans("ErrorMissingParameters"), null, 'errors');
+    header("Location: declarationtvaindex.php");
+    exit;
+}
+
+// Initialize objects
+$declarationtva = new DeclarationTVA($db);
+$config = new DeclarationTVA_Config($db);
+
+// Get declaration info
+if (!$declarationtva->fetch($declaration_id)) {
+    setEventMessages($langs->trans("DeclarationNotFound"), null, 'errors');
+    header("Location: declarationtvaindex.php");
+    exit;
+}
+
+// Get detailed breakdown
+$line_details = $declarationtva->getCA3LineDetails($declaration_id, $ca3_line);
+
+if (empty($line_details)) {
+    setEventMessages($langs->trans("NoDataFoundForLine"), null, 'errors');
+    header("Location: declarationtva_view.php?id=" . $declaration_id);
+    exit;
+}
+
+// Get CA-3 line definition
+$ca3_definitions = $config->getCA3LineDefinitions();
+$line_definition = isset($ca3_definitions[$ca3_line]) ? $ca3_definitions[$ca3_line] : null;
+
+// Page title
+$title = $langs->trans("CA3LineDetails") . " - " . $ca3_line;
+if ($line_definition) {
+    $title .= " - " . $line_definition['label'];
+}
+
+// Load page header
+llxHeader('', $title);
+
+// Page header
+print load_fiche_titre($title, '', 'fa-list-alt');
+
+// Breadcrumb
+print '<div class="tabsAction">';
+print '<a href="declarationtvaindex.php" class="butAction">' . $langs->trans("BackToList") . '</a>';
+print '<a href="declarationtva_view.php?id=' . $declaration_id . '" class="butAction">' . $langs->trans("BackToDeclaration") . '</a>';
+print '</div>';
+
+// Declaration info
+print '<div class="fiche">';
+print '<div class="fichehalfleft">';
+print '<table class="noborder centpercent">';
+print '<tr class="liste_titre">';
+print '<th colspan="2">' . $langs->trans("DeclarationInfo") . '</th>';
+print '</tr>';
+print '<tr>';
+print '<td>' . $langs->trans("DeclarationNumber") . '</td>';
+print '<td>' . $declarationtva->declaration_number . '</td>';
+print '</tr>';
+print '<tr>';
+print '<td>' . $langs->trans("Period") . '</td>';
+print '<td>' . dol_print_date($declarationtva->start_date, 'day') . ' - ' . dol_print_date($declarationtva->end_date, 'day') . '</td>';
+print '</tr>';
+print '<tr>';
+print '<td>' . $langs->trans("CA3Line") . '</td>';
+print '<td><strong>' . $ca3_line . '</strong></td>';
+print '</tr>';
+if ($line_definition) {
+    print '<tr>';
+    print '<td>' . $langs->trans("Description") . '</td>';
+    print '<td>' . $line_definition['label'] . '</td>';
+    print '</tr>';
+}
+print '</table>';
+print '</div>';
+
+print '<div class="fichehalfright">';
+print '<table class="noborder centpercent">';
+print '<tr class="liste_titre">';
+print '<th colspan="2">' . $langs->trans("LineSummary") . '</th>';
+print '</tr>';
+print '<tr>';
+print '<td>' . $langs->trans("AccountCount") . '</td>';
+print '<td><strong>' . $line_details['account_count'] . '</strong></td>';
+print '</tr>';
+if ($line_details['calculated_line']) {
+    print '<tr>';
+    print '<td>' . $langs->trans("CalculatedTotal") . '</td>';
+    print '<td><strong>' . price($line_details['calculated_line']->total_amount) . '</strong></td>';
+    print '</tr>';
+}
+print '</table>';
+print '</div>';
+print '</div>';
+
+// Account details table
+print '<div class="fiche">';
+print '<table class="noborder centpercent">';
+print '<tr class="liste_titre">';
+print '<th>' . $langs->trans("AccountCode") . '</th>';
+print '<th>' . $langs->trans("AccountLabel") . '</th>';
+print '<th class="right">' . $langs->trans("BaseAmount") . '</th>';
+print '<th class="right">' . $langs->trans("VATAmount") . '</th>';
+print '<th class="right">' . $langs->trans("TotalAmount") . '</th>';
+print '<th>' . $langs->trans("MappingType") . '</th>';
+print '</tr>';
+
+$total_base = 0;
+$total_vat = 0;
+$total_amount = 0;
+
+foreach ($line_details['account_details'] as $account) {
+    $total_base += $account['base_amount'];
+    $total_vat += $account['vat_amount'];
+    $total_amount += $account['total_amount'];
+    
+    print '<tr class="oddeven">';
+    print '<td><strong>' . $account['account_code'] . '</strong></td>';
+    print '<td>' . $account['account_label'] . '</td>';
+    print '<td class="right">' . price($account['base_amount']) . '</td>';
+    print '<td class="right">' . price($account['vat_amount']) . '</td>';
+    print '<td class="right">' . price($account['total_amount']) . '</td>';
+    print '<td>' . $account['mapping_type'] . '</td>';
+    print '</tr>';
+}
+
+// Totals row
+print '<tr class="liste_titre">';
+print '<td colspan="2"><strong>' . $langs->trans("Total") . '</strong></td>';
+print '<td class="right"><strong>' . price($total_base) . '</strong></td>';
+print '<td class="right"><strong>' . price($total_vat) . '</strong></td>';
+print '<td class="right"><strong>' . price($total_amount) . '</strong></td>';
+print '<td></td>';
+print '</tr>';
+
+print '</table>';
+print '</div>';
+
+// Additional info if calculated line exists
+if ($line_details['calculated_line']) {
+    print '<div class="info">';
+    print '<strong>' . $langs->trans("Note") . ':</strong> ';
+    print $langs->trans("CalculatedLineNote");
+    if (!empty($line_details['calculated_line']->line_label)) {
+        print '<br><em>' . $line_details['calculated_line']->line_label . '</em>';
+    }
+    print '</div>';
+}
+
+// Close page
+llxFooter();
+?>

declarationtva_view.php

@@ -173,7 +173,7 @@ foreach ($section_a_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'vat_amount' => 0);
     $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
     print '<tr>';
-    print '<td>' . $line . '</td>';
+    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
     print '<td colspan="2">' . $description . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
     print '</tr>';
@@ -201,7 +201,7 @@ foreach ($base_vat_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'base_amount' => 0, 'vat_amount' => 0);
     $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
     print '<tr>';
-    print '<td>' . $line . '</td>';
+    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
     print '<td>' . $description . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['base_amount'], $data['line_label'], 'base') . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
@@ -226,7 +226,7 @@ print '</tr>';
 $data = isset($ca3_data['17']) ? $ca3_data['17'] : array('line_label' => '', 'vat_amount' => 0);
 $description = isset($ca3_definitions['17']) ? $ca3_definitions['17']['label'] : $data['line_label'];
 print '<tr>';
-print '<td>17</td>';
+print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=17" class="butAction">17</a></td>';
 print '<td colspan="2">' . $description . '</td>';
 print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
 print '</tr>';
@@ -247,7 +247,7 @@ foreach ($section_c_lines as $line) {
     $data = isset($ca3_data[$line]) ? $ca3_data[$line] : array('line_label' => '', 'vat_amount' => 0);
     $description = isset($ca3_definitions[$line]) ? $ca3_definitions[$line]['label'] : $data['line_label'];
     print '<tr>';
-    print '<td>' . $line . '</td>';
+    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
     print '<td colspan="2">' . $description . '</td>';
     print '<td class="right">' . formatAmountWithOriginal($data['vat_amount'], $data['line_label']) . '</td>';
     print '</tr>';
@@ -284,7 +284,7 @@ foreach ($section_d_lines as $line) {
     }
     
     print '<tr>';
-    print '<td>' . $line . '</td>';
+    print '<td><a href="declarationtva_line_details.php?declaration_id=' . $declarationtva->rowid . '&ca3_line=' . $line . '" class="butAction">' . $line . '</a></td>';
     print '<td colspan="2">' . $description . '</td>';
     print '<td class="right">' . formatAmount($data['vat_amount']) . '</td>';
     print '</tr>';

langs/en_US/declarationtva.lang

@@ -441,3 +441,19 @@ BaseAmount = Base Amount
 VATAmount = VAT Amount
 TotalAmount = Total Amount
 BaseHTAndVATByRate = Base HT and VAT by Rate
+
+# Detailed view translations
+CA3LineDetails = CA-3 Line Details
+BackToDeclaration = Back to Declaration
+DeclarationInfo = Declaration Information
+LineSummary = Line Summary
+AccountCount = Account Count
+CalculatedTotal = Calculated Total
+AccountCode = Account Code
+AccountLabel = Account Label
+MappingType = Mapping Type
+Total = Total
+Note = Note
+CalculatedLineNote = This line shows the detail of accounts used to calculate the CA-3 line. Amounts may differ slightly from the calculated total due to rounding.
+ErrorMissingParameters = Missing parameters
+NoDataFoundForLine = No data found for this line

langs/fr_FR/declarationtva.lang

@@ -430,3 +430,19 @@ BaseAmount = Base hors taxe
 VATAmount = Taxe due
 TotalAmount = Montant Total
 BaseHTAndVATByRate = Base HT et TVA par taux
+
+# Detailed view translations
+CA3LineDetails = Détails de la ligne CA-3
+BackToDeclaration = Retour à la déclaration
+DeclarationInfo = Informations de la déclaration
+LineSummary = Résumé de la ligne
+AccountCount = Nombre de comptes
+CalculatedTotal = Total calculé
+AccountCode = Code compte
+AccountLabel = Libellé compte
+MappingType = Type de mapping
+Total = Total
+Note = Note
+CalculatedLineNote = Cette ligne montre le détail des comptes utilisés pour calculer la ligne CA-3. Les montants peuvent différer légèrement du total calculé en raison des arrondis.
+ErrorMissingParameters = Paramètres manquants
+NoDataFoundForLine = Aucune donnée trouvée pour cette ligne