support fetching application with pagination (#450)

* support fetching application with pagination

* pagination for voip carrier

* wip

* wip

* wip

* support phone number pagination

* wip

* wip

* wip

lib/models/application.js

@@ -36,24 +36,55 @@ class Application extends Model {
     super();
   }
 
+  static _criteriaBuilder(obj, args) {
+    let sql = '';
+    if (obj.account_sid) {
+      sql += ' AND app.account_sid = ?';
+      args.push(obj.account_sid);
+    }
+    if (obj.service_provider_sid) {
+      sql += ' AND app.account_sid in (SELECT account_sid from accounts WHERE service_provider_sid = ?)';
+      args.push(obj.service_provider_sid);
+    }
+    if (obj.name) {
+      sql += ' AND app.name LIKE ?';
+      args.push(`%${obj.name}%`);
+    }
+    return sql;
+  }
+
+  static countAll(obj) {
+    let sql = 'SELECT COUNT(*) AS count FROM applications app WHERE 1 = 1';
+    const args = [];
+    sql += Application._criteriaBuilder(obj, args);
+    return new Promise((resolve, reject) => {
+      getMysqlConnection((err, conn) => {
+        if (err) return reject(err);
+        conn.query({sql}, args, (err, results) => {
+          conn.release();
+          if (err) return reject(err);
+          resolve(results[0].count);
+        });
+      });
+    });
+  }
+
   /**
    * list all applications - for all service providers, for one service provider, or for one account,
    * or by an optional name
    */
-  static retrieveAll(service_provider_sid, account_sid, name) {
+  static retrieveAll(obj) {
+    const { page, page_size = 50 } = obj || {};
     let sql = retrieveSql + ' WHERE 1 = 1';
     const args = [];
-    if (account_sid) {
-      sql = `${sql} AND app.account_sid = ?`;
-      args.push(account_sid);
-    }
-    else if (service_provider_sid) {
-      sql = `${sql} AND account_sid in (SELECT account_sid from accounts WHERE service_provider_sid = ?)`;
-      args.push(service_provider_sid);
-    }
-    if (name) {
-      sql = `${sql} AND app.name = ?`;
-      args.push(name);
+    sql += Application._criteriaBuilder(obj, args);
+
+    if (page !== null && page !== undefined) {
+      const limit = Number(page_size);
+      const offset = Number(page > 0 ? (page - 1) : page) * limit;
+      sql += ' LIMIT ? OFFSET ?';
+      args.push(limit);
+      args.push(offset);
     }
     return new Promise((resolve, reject) => {
       getMysqlConnection((err, conn) => {