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/* DreemGL is a collaboration between Teeming Society & Samsung Electronics, sponsored by Samsung and others.
   Copyright 2015-2016 Teeming Society. Licensed under the Apache License, Version 2.0 (the "License"); You may not use this file except in compliance with the License.
   You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing,
   software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and limitations under the License.*/


define.class(function($ui$, view, label){

        // internal, Slide viewer is an automatic slide viewer that turns child nodes into slides
        // use attributes named 'slidetitle' on a child to set the slide title1
        this.attributes = {
                // the width of a slide
                slidewidth: 1024,
                // the height of a slide
                slideheight: 1024,
                // the margin between slides
                slidemargin: 10,
                // the current page
                page: Config({type:int, persist:true, value:0}),
                // animate the scroll
                scroll: Config({motion:'inoutsine', duration:0.5}),
                // persist the postiion
                pos: Config({persist:true})
        }

        // the class for a nested slide, its automatically wrapped around children
        define.class(this, 'slide', function($ui$, view){
                this.borderradius = vec4(10)
                this.borderwidth = 0
                this.bordercolor = vec4("blue")
                this.bgcolor = "white"

                this.flex = 0
                this.viewport = '2d'
                this.overflow = 'hidden'
                this.padding = vec4(6);

                this.viewportblend = function(){
                        this.color = function(){
                                //return 'red'

                                var col = texture.sample(mesh.xy)
                                return vec4(col.rgb, col.a * view.opacity)
                        }
                }

                this.render = function(){
                        return view({
                                        hardrect:{
                                                color:function(){
                                                        return vec4(1- mesh.y*0.4, 1- mesh.y*0.4,1- mesh.y*0.2,1)
                                                }
                                        },
                                        //bgcolor: 'blue',
                                        //borderradius:vec4(10),
                                        flex:1,
                                        flexdirection:'column'
                                },
                                label({
                                        margin:[10,10,10,10],
                                        fgcolor:'black',
                                        bgcolor:NaN,
                                        fontsize:50,
                                        alignself:'center',
                                        text:this.title
                                }),
                                view({
                                        flex:1,
                                        bgcolor:"transparent",
                                        padding:vec4(10)
                                        },
                                        this.constructor_children,
                                0),
                        0)
                }
        });

        this.page = function(event){
                if(!this.children) return
                if(event.mark) return
                // set the scroll from the page
                if(this._page < 0) this._page = 0
                var len = this.constructor_children.length
                if(this._page > len - 1) this._page = len - 1

                this.scroll = vec2(this.page * (this.slidewidth + this.slidemargin * 2), 0)
        }

        this.scroll = function(event){
                var page = ceil(event.value[0] / (this.slidewidth + this.slidemargin * 2))

                if(event.animate){
                }
                else if(event.mark){
                        this._page = page
                }
                else{
                        this.page = Mark(page)
                }
        }

        this.flexwrap = "nowrap"
        this.constructor.slide = this.slide
        this.boundscheck = true

        this.keydown = function(key){
                // alright we have a keydown!
                if(key.name == 'leftarrow'){
                        // we need to animate to the left
                        if(this.page >0) this.page --
                }
                else if(key.name == 'rightarrow'){
                        // animate to the right
                        if(this.page < this.constructor_children.length-1)this.page++
                }
        }

        // deny focus loss
        this.focuslost = function(){
                this.screen.setFocus(this)
        }

        this.init = function(){
                this.screen.setFocus(this)
        }

        this.render = function(){
                // ok lets render all our slides using our container slide
                var count = 0
                return this.constructor_children.map(function(item){
                        count++
                        return this.slide({
                                flexdirection:'column',
                                width:this.slidewidth,
                                margin:this.slidemargin,
                                height:this.slideheight,
                                title:item.slidetitle
                        }, item)
                }.bind(this))
        }
})