// ==========================================================================
// Project:   SproutCore - JavaScript Application Framework
// Copyright: ©2006-2009 Sprout Systems, Inc. and contributors.
//            portions copyright @2009 Apple Inc.
// License:   Licensed under MIT license (see license.js)
// ==========================================================================

/*
  This test evaluates a plain list with no custom row heights, outlines, 
  group views or any other non-standard behavior.
*/

module("SC.ListView - simple list");

// create a fake content array.  Generates a list with whatever length you
// want of objects with a title based on the index.  Cannot mutate.
var ContentArray = SC.Object.extend(SC.Array, {
  
  length: 0,
  
  objectAt: function(idx) {
    if (idx >= this.get('length')) return undefined;
    
    var content = this._content, ret ;
    if (!content) content = this._content = [];
    
    ret = content[idx];
    if (!ret) {
      ret = content[idx] = SC.Object.create({ 
        title: "ContentItem %@".fmt(idx),
        isDone: (idx % 3)===0,
        unread: (Math.random() > 0.5) ? Math.floor(Math.random() * 100) : 0
      });
    }
    
    return ret ;
  }
});

var pane = SC.ControlTestPane.design()
  .add("basic", SC.ScrollView.design({
    layout: { left: 0, right: 0, top: 0, height: 300 },
    hasHorizontalScroller: NO,
    contentView: SC.ListView.design({
      content: ContentArray.create({ length: 20001 }),
      contentValueKey: "title",
      contentCheckboxKey: "isDone",
      contentUnreadCountKey: "unread",
      rowHeight: 20
      
    })
  }));
  
pane.show(); // add a test to show the test pane
window.pane = pane ;

function verifyChildViewsMatch(views, set) {
  var indexes = set.clone();
  views.forEach(function(view) {
    var idx = view.contentIndex ;
    if (indexes.contains(idx)) {
      ok(YES, "should find childView for contentIndex %@ (nowShowing=%@)".fmt(idx, set));
    } else {
      ok(NO, "should NOT find childView for contentIndex %@ (nowShowing=%@)".fmt(idx, set));
    }
    indexes.remove(idx);
  }, this);
  
  if (indexes.get('length') === 0) {
    ok(YES, "all nowShowing indexes should have matching child views");
  } else {
    ok(NO, "all nowShowing indexes should have matching child views (indexes not found: %@)".fmt(indexes));
  }
}

// ..........................................................
// BASIC RENDER TESTS
// 

test("rendering only incremental portion", function() {
  var listView = pane.view("basic").contentView; 
  ok(listView.getPath("nowShowing.length") < listView.get('length'), 'nowShowing should be a subset of content items');
  equals(listView.get('childViews').length, listView.get('nowShowing').get('length'), 'should have same number of childViews as nowShowing length');  
});

test("scrolling by small amount should update incremental rendering", function() {
  var scrollView = pane.view('basic'),
      listView   = scrollView.contentView,
      exp;

  ok(listView.getPath('nowShowing.length') < listView.get('length'), 'precond - nowShowing has incremental range');

  // SCROLL DOWN ONE LINE
  SC.run(function() {
    scrollView.scrollTo(0,20);
  });
  
  // top line should have scrolled out of view
  exp = SC.IndexSet.create(1,15);
  same(listView.get('nowShowing'), exp, 'nowShowing should change to reflect new clippingFrame');

  verifyChildViewsMatch(listView.childViews, exp);

  // SCROLL DOWN ANOTHER LINE
  SC.run(function() {
    scrollView.scrollTo(0,42);
  });
  
  // top line should have scrolled out of view
  exp = SC.IndexSet.create(2,16);
  same(listView.get('nowShowing'), exp, 'nowShowing should change to reflect new clippingFrame');

  verifyChildViewsMatch(listView.childViews, exp);


  // SCROLL UP ONE LINE
  SC.run(function() {
    scrollView.scrollTo(0,21);
  });
  
  // top line should have scrolled out of view
  exp = SC.IndexSet.create(1,16);
  same(listView.get('nowShowing'), exp, 'nowShowing should change to reflect new clippingFrame');

  verifyChildViewsMatch(listView.childViews, exp);
  
});