From 3dbcc9774c8f49bf32d86e0deed0d6ec0ed0b4ec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gr=C3=A9gory=20Oestreicher?= <greg@kamago.net>
Date: Sat, 17 Dec 2016 18:29:03 +0100
Subject: [PATCH] Sync deletions that happened on the server

---
 qml/js/WallaBase.js      | 76 ++++++++++++++++++++++++++++++++++++++++
 qml/pages/ServerPage.qml |  6 +++-
 qml/types/Server.qml     | 23 ++++++++++++
 3 files changed, 104 insertions(+), 1 deletion(-)

diff --git a/qml/js/WallaBase.js b/qml/js/WallaBase.js
index 8458e26..f4feccf 100644
--- a/qml/js/WallaBase.js
+++ b/qml/js/WallaBase.js
@@ -277,6 +277,82 @@ function _sendAuthRequest( props, cb )
   Articles management
  */
 
+function syncDeletedArticles( timerSource, props, cb )
+{
+    var db = getDatabase();
+
+    db.readTransaction(
+        function( tx ) {
+            var res = tx.executeSql( "SELECT id, url FROM articles WHERE server=?", [ props.id ] );
+            var articles = new Array;
+
+            for ( var i = 0; i < res.rows.length; ++i ) {
+                articles.push( res.rows[i] );
+            }
+
+            var working = false;
+
+            function processArticlesList() {
+                if ( articles.length === 0 ) {
+                    cb();
+                }
+                else {
+                    if ( !working )
+                        timerSource.setTimeout( _checkNextArticle, 100 );
+                    timerSource.setTimeout( processArticlesList, 500 );
+                }
+            }
+
+            function _checkNextArticle() {
+                working = true;
+                var article = articles.pop();
+
+                var url = props.url;
+                if ( url.charAt( url.length - 1 ) !== "/" )
+                    url += "/";
+                url += "api/entries/exists.json";
+
+                var params = "url=";
+                params += encodeURIComponent( article.url );
+                url += "?" + params;
+
+                var http = new XMLHttpRequest;
+
+                http.onreadystatechange = function() {
+                    if ( http.readyState === XMLHttpRequest.DONE ) {
+                        console.debug( "Checking if article " + article.id + " exists, response status is " + http.status );
+                        var json = null;
+
+                        if ( http.status === 200 ) {
+                            try {
+                                json = JSON.parse( http.responseText )
+                            }
+                            catch( e ) {
+                                json = null;
+                            }
+
+                            if ( !json.exists ) {
+                                console.debug( "Article " + article.id + " has been deleted" );
+                                deleteArticle( props.id, article.id );
+                            }
+                        }
+                        // In case of error let's assume that the article exists
+
+                        working = false;
+                    }
+                };
+
+                http.open( "GET", url, true );
+                http.setRequestHeader( "Authorization:", "Bearer " + props.token );
+
+                http.send();
+            }
+
+            timerSource.setTimeout( processArticlesList, 500 );
+        }
+    );
+}
+
 function getArticles( serverId, cb, filter )
 {
     var db = getDatabase();
diff --git a/qml/pages/ServerPage.qml b/qml/pages/ServerPage.qml
index 6d351f3..118fe7f 100644
--- a/qml/pages/ServerPage.qml
+++ b/qml/pages/ServerPage.qml
@@ -113,7 +113,11 @@ Page {
                 text: qsTr( "Refresh" )
                 onClicked: {
                     articlesModel.loaded = false
-                    server.getUpdatedArticles()
+                    server.syncDeletedArticles(
+                        function() {
+                            server.getUpdatedArticles()
+                        }
+                    )
                 }
             }
         }
diff --git a/qml/types/Server.qml b/qml/types/Server.qml
index 80a70b2..2012fcc 100644
--- a/qml/types/Server.qml
+++ b/qml/types/Server.qml
@@ -25,6 +25,8 @@ import harbour.wallaread 1.0
 import "../js/WallaBase.js" as WallaBase
 
 Item {
+    id: server
+
     property int serverId: -1
     property string name
     property string url
@@ -58,6 +60,14 @@ Item {
         id: httpRequester
     }
 
+    function setTimeout( cb, ms ) {
+        var timer = Qt.createQmlObject( "import QtQuick 2.0; Timer {}", server );
+        timer.repeat = false
+        timer.interval = ms
+        timer.triggered.connect( function() { cb(); timer.destroy(); } )
+        timer.start()
+    }
+
     function onServerLoaded( props, err ) {
         if ( err !== null ) {
             error( qsTr( "Failed to load server information: " ) + err )
@@ -101,6 +111,19 @@ Item {
         return tokenExpiry > Math.floor( (new Date).getTime() / 1000 )
     }
 
+    function syncDeletedArticles( cb ) {
+        connect(
+            function( err ) {
+                if ( err !== null ) {
+                    error( qsTr( "Failed to connect to server: " ) + err )
+                }
+                else {
+                    WallaBase.syncDeletedArticles( server, { id: serverId, token: accessToken, url: url }, function() { cb(); } )
+                }
+            }
+        )
+    }
+
     function getUpdatedArticles() {
         connect(
             function( err ) {