From 04a0bff7061f65479fc9c3f1045af107aab0328f Mon Sep 17 00:00:00 2001
From: Ivan Socolsky <jungans@gmail.com>
Date: Mon, 10 Nov 2014 10:40:03 -0300
Subject: [PATCH] added pagination

---
 js/controllers/history.js | 39 +++++++++++++++++++++++++++++++-------
 js/models/Wallet.js       | 40 ++++++++++++++++++++++++++++++++++++---
 views/history.html        |  2 ++
 3 files changed, 71 insertions(+), 10 deletions(-)

diff --git a/js/controllers/history.js b/js/controllers/history.js
index 72a1e5b93..ff8f41ebc 100644
--- a/js/controllers/history.js
+++ b/js/controllers/history.js
@@ -11,8 +11,9 @@ angular.module('copayApp.controllers').controller('HistoryController',
     $scope.loading = false;
     $scope.lastShowed = false;
 
-    $scope.txpCurrentPage = 1;
-    $scope.txpItemsPerPage = 4;
+    $scope.currentPage = 1;
+    $scope.itemsPerPage = 10;
+    $scope.nbPages = 0;
     $scope.blockchain_txs = [];
     $scope.alternativeCurrency = [];
 
@@ -24,19 +25,38 @@ angular.module('copayApp.controllers').controller('HistoryController',
       $scope.loading = true;
       setTimeout(function() {
         $scope.update();
-      }, 10);
+      }, 1);
     };
 
+    $scope.nextPage = function() {
+      $scope.currentPage++;
+      $scope.update();
+    };
+
+    $scope.previousPage = function() {
+      $scope.currentPage--;
+      $scope.update();
+    };
+
+    $scope.hasNextPage = function() {
+      return $scope.currentPage < $scope.nbPages;
+    };
+
+    $scope.hasPreviousPage = function() {
+      return $scope.currentPage > 1;
+    };
 
     $scope.getTransactions = function() {
-
       var w = $rootScope.wallet;
       if (!w) return;
 
       $scope.blockchain_txs = w.cached_txs || [];
       $scope.loading = true;
 
-      w.getTransactionHistory(function(err, res) {
+      w.getTransactionHistory({
+        currentPage: $scope.currentPage,
+        itemsPerPage: $scope.itemsPerPage,
+      }, function(err, res) {
         if (err) throw err;
 
         if (!res) {
@@ -45,10 +65,15 @@ angular.module('copayApp.controllers').controller('HistoryController',
           return;
         }
 
-        _.each(res, function(r) {
+        var items = res.items;
+
+        _.each(items, function(r) {
           r.ts = r.minedTs || r.sentTs;
         });
-        $scope.blockchain_txs = w.cached_txs = res;
+        $scope.blockchain_txs = w.cached_txs = items;
+        $scope.nbPages = res.nbPages;
+
+
         $scope.loading = false;
         setTimeout(function() {
           $scope.$digest();
diff --git a/js/models/Wallet.js b/js/models/Wallet.js
index 38ace1a9a..24ceb468b 100644
--- a/js/models/Wallet.js
+++ b/js/models/Wallet.js
@@ -1289,7 +1289,7 @@ Wallet.prototype._getActionList = function(actions) {
   var peers = Object.keys(actions).map(function(i) {
     return {
       cId: i,
-    actions: actions[i]
+      actions: actions[i]
     }
   });
 
@@ -2836,9 +2836,22 @@ Wallet.request = function(options, callback) {
 };
 
 
-Wallet.prototype.getTransactionHistory = function(cb) {
+/**
+ * @desc Return a list of past transactions
+ *
+ * @param {number} opts.currentPage - the desired page in the dataset
+ * @param {number} opts.itemsPerPage - number of items per page
+ * @return {Object} the list of transactions
+ */
+Wallet.prototype.getTransactionHistory = function(opts, cb) {
   var self = this;
 
+  if (_.isFunction(opts)) {
+    cb = opts;
+    opts = {};
+  }
+  opts = opts || {};
+
   var addresses = self.getAddressesInfo();
   var proposals = self.getTxProposals();
   var satToUnit = 1 / self.settings.unitToSatoshi;
@@ -2948,6 +2961,23 @@ Wallet.prototype.getTransactionHistory = function(cb) {
     }
   };
 
+  function paginate(list, currentPage, itemsPerPage) {
+    if (list.length == 0) return list;
+
+    var res = {
+      itemsPerPage: itemsPerPage || list.length,
+      currentPage: currentPage || 1,
+      nbItems: list.length,
+    };
+    res.nbPages = res.itemsPerPage != 0 ? Math.ceil(res.nbItems / res.itemsPerPage) : 1;
+
+    var from = (res.currentPage - 1) * res.itemsPerPage;
+    var to = Math.min(from + res.itemsPerPage, res.nbItems);
+    res.items = list.slice(from, to);
+
+    return res;
+  };
+
   if (addresses.length > 0) {
     var addressesStr = _.pluck(addresses, 'addressStr');
     self.blockchain.getTransactions(addressesStr, function(err, txs) {
@@ -2957,7 +2987,11 @@ Wallet.prototype.getTransactionHistory = function(cb) {
         decorateTx(tx);
         return tx;
       });
-      return cb(null, history);
+      history.sort(function(a, b) {
+        return (b.sentTs || b.minedTs) - (a.sentTs || a.minedTs);
+      });
+
+      return cb(null, paginate(history, opts.currentPage, opts.itemsPerPage));
     });
   }
 };
diff --git a/views/history.html b/views/history.html
index 750292d6f..deac8c694 100644
--- a/views/history.html
+++ b/views/history.html
@@ -100,6 +100,8 @@
             </div>
           </div>
         </div>
+          <button ng-click="previousPage()" ng-disabled="!hasPreviousPage()">prev</button>
+          <button ng-click="nextPage()" ng-disabled="!hasNextPage()">next</button>
       </div>
     </div>
   </div>