Phase 4: Support LID identity scheme and fix incoming message parsing

backend/app/Models/ChatbotRule.php

@@ -0,0 +1,102 @@
+<?php
+
+namespace App\Models;
+
+use App\Core\Security;
+use App\Core\Database;
+
+/**
+ * ChatbotRule Model
+ * Handles the chatbot_rules table with encryption for Gemini API key.
+ */
+class ChatbotRule extends BaseModel
+{
+    protected static string $table = 'chatbot_rules';
+
+    /**
+     * Find chatbot rules for a company
+     */
+    public static function findAllByCompany(int $companyId)
+    {
+        self::ensureColumnsExist();
+
+        $rules = Database::select(
+            "SELECT * FROM " . static::$table . " WHERE company_id = ? ORDER BY id DESC",
+            [$companyId]
+        );
+
+        foreach ($rules as &$rule) {
+            if (!empty($rule['gemini_api_key'])) {
+                $rule['gemini_api_key'] = Security::decrypt($rule['gemini_api_key']);
+            }
+        }
+
+        return $rules;
+    }
+
+    /**
+     * Find active chatbot rule for a specific company and session
+     */
+    public static function findActiveForRule(int $companyId, ?int $sessionId = null)
+    {
+        self::ensureColumnsExist();
+
+        if ($sessionId) {
+            $rule = Database::selectOne(
+                "SELECT * FROM " . static::$table . " WHERE company_id = ? AND (session_id = ? OR session_id IS NULL) AND is_active = 1 LIMIT 1",
+                [$companyId, $sessionId]
+            );
+        } else {
+            $rule = Database::selectOne(
+                "SELECT * FROM " . static::$table . " WHERE company_id = ? AND is_active = 1 LIMIT 1",
+                [$companyId]
+            );
+        }
+
+        if ($rule && !empty($rule['gemini_api_key'])) {
+            $rule['gemini_api_key'] = Security::decrypt($rule['gemini_api_key']);
+        }
+
+        return $rule;
+    }
+
+    /**
+     * Create or update chatbot rule securely
+     */
+    public static function saveSecure(array $data)
+    {
+        self::ensureColumnsExist();
+
+        if (!empty($data['gemini_api_key'])) {
+            $data['gemini_api_key'] = Security::encrypt($data['gemini_api_key']);
+        }
+
+        if (isset($data['id'])) {
+            $id = $data['id'];
+            unset($data['id']);
+            self::update($id, $data);
+            return $id;
+        } else {
+            return self::create($data);
+        }
+    }
+
+    /**
+     * Helper to run ALTER TABLE to make sure gemini_api_key exists in chatbot_rules
+     */
+    private static function ensureColumnsExist()
+    {
+        static $checked = false;
+        if ($checked) return;
+        try {
+            // Check if column exists
+            $columns = Database::select("SHOW COLUMNS FROM " . static::$table . " LIKE 'gemini_api_key'");
+            if (empty($columns)) {
+                Database::execute("ALTER TABLE " . static::$table . " ADD COLUMN gemini_api_key VARCHAR(512) DEFAULT NULL AFTER ai_prompt");
+            }
+            $checked = true;
+        } catch (\Exception $e) {
+            error_log("Failed to ensure chatbot_rules column: " . $e->getMessage());
+        }
+    }
+}