document.addEventListener('DOMContentLoaded', function() {
    // console.log(window.screen.width)
    wde = new WebDesktopEnvironment
    if (!WebDesktopEnvironment.isMobile){
        WebDesktopEnvironment.Open("finder", ["/home/user"])
        // WebDesktopEnvironment.Open("blog-viewer", ["/home/user/blog/test-1.blog"])
        // WebDesktopEnvironment.Open("personal-properties", ["kek"])
    } else {
        WebDesktopEnvironment.Open("blog-viewer", ["/home/user/blog/test-1.blog"])
    }
    
    
    // WebDesktopEnvironment.Open("personal-properties")
}, false);

class WebDesktopEnvironment{
    static Applications = {};
    static isMobile = false
    constructor(){
        WebDesktopEnvironment.isMobile = WebDesktopEnvironment.CheckMobile()
        
        let applications = document.createElement("div")
        applications.setAttribute('id', 'applications')
        document.body.appendChild(applications)

        if( WebDesktopEnvironment.isMobile){
            document.body.style.setProperty('--zoom', 3)            

            let mobileDesktop = document.createElement("div")
            mobileDesktop.setAttribute('id', 'mobile-desktop')
            document.body.appendChild(mobileDesktop)

            fetch(`${window.location.origin}/system/wde/renderMobileDesktop` )
            .then((response) => response.text())
            .then((html) => {
                mobileDesktop.innerHTML = html
                WebDesktopEnvironment.LoadApp("finder", () =>{
                    new FileView("/kek", mobileDesktop.querySelector(".FileTileView"), Finder.Click)

                    mobileDesktop.querySelector('#about-me').addEventListener('click', (event) => {
                        //TODO Do not allow launch second instance
                        WebDesktopEnvironment.Open("personal-properties", [])
                    })
                    mobileDesktop.querySelector('#mobile-desktop-blog').addEventListener('click', (event) => {
                        //TODO Do not allow launch second instance
                        WebDesktopEnvironment.Open("blog-viewer", ['main-page'])
                    })
                    mobileDesktop.querySelector('#mobile-dekstop-close').addEventListener('click', (event) => {
                        // console.log('close')
                        WebDesktopEnvironment.CloseFocusedWindow()
                    })
                })
            })
            .catch((error) => {
                WebDesktopEnvironment.Alert(error);
            })
            
        } else{
            document.body.style.setProperty('--zoom', 1)
            
            let windowsLayer = document.createElement("div")
            windowsLayer.setAttribute('id', 'windows-layer')
            document.body.appendChild(windowsLayer)
        }
        this.wc = new WindowsCompositor

    }
    /**
    * @param {string} appId
    * @param {function} func callback after script loading
    * @returns {Application | undefined}
    */
    static LoadApp(appId, func){
        // console.log(`Load application ${appId}`)

        let script = document.createElement("script")
        script.setAttribute("appId", appId)
        script.setAttribute("src", `${window.location.origin}/system/applications/${appId}/app.js`)
        script.setAttribute("async", "false")
        document.getElementById("applications").appendChild(script)

        script.addEventListener('load', (event) =>{
            switch (appId) {
                case "finder":
                    let newFinderApp = new Finder()
                    this.Applications[appId] = newFinderApp
                    func()
                    return newFinderApp
                case "personal-properties":
                    let newPersonalPropertiesApp = new PersonalProperties()
                    this.Applications[appId] = newPersonalPropertiesApp
                    func()
                    return newPersonalPropertiesApp
                case "img-viewer":
                    let newImgViewer = new ImgViewer()
                    this.Applications[appId] = newImgViewer
                    func()
                    return newImgViewer
                case "blog-viewer":
                    let newBlogViewer = new BlogViewer()
                    this.Applications[appId] = newBlogViewer
                    func()
                    return newBlogViewer
                default:
                    break;
            }

        })
    }

    /**
    * @param {string} appId
    * @param {string[]} args
    */
    static Open(appId, args){
        if (this.Applications[appId] == undefined){
            console.log(`Application ${appId} is not loaded yet`)
            WebDesktopEnvironment.LoadApp(appId, () =>{
                this.Applications[appId].NewWindow(args)
            })
        } else {
            this.Applications[appId].NewWindow(args)
        }
    }

    /**
    * @param {string} appId
    * @param {number} width
    * @param {number} height
    * @returns {HTMLElement}
    */
    static CreateNewWindow(appId, width, height) {    
        let newWindow = document.createElement("div")
        if (WebDesktopEnvironment.isMobile){
            newWindow.setAttribute("class", "MobileApplicationWindow")
            document.body.querySelector('#windows-layer').appendChild(newWindow)
            return newWindow
        } else {
            newWindow.setAttribute("class", "StandartApplicationWindow")
            newWindow.setAttribute("windowId", "SuperUniqUUID") //TODO:

            newWindow.style.width = width.toString() + "px"
            newWindow.style.height = height.toString() + "px"

            document.body.querySelector('#windows-layer').appendChild(newWindow)
            return newWindow
        }
    }
    /**
    * @param {HTMLElement} window
    */
    static CloseWindow(window) {
        window.remove()
    }

    static CloseFocusedWindow() {
        if (document.body.querySelector('#windows-layer').childElementCount > 1){
            document.body.querySelector('#windows-layer').lastElementChild.remove()
        }
    }

    /**
    * @param {string} html
    */
    static SetBasicWindow(html){
        this.basicWindow = html
    }

    /**
    * @returns {string}
    */
    static GetBasicWindow(){
        return this.basicWindow
    }

    /**
    * @param {string} alertText
    */
    static Alert(alertText){
        console.log(alertText)
    }

    static CheckMobile(){    
        var check = false;
        (function(a){if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|mobile.+firefox|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows ce|xda|xiino|android|ipad|playbook|silk/i.test(a)||/1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(a.substr(0,4))) check = true;})(navigator.userAgent||navigator.vendor||window.opera);
        return check;
    }
}

var getJSON = function(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'json';
    xhr.onload = function() {
      var status = xhr.status;
      if (status === 200) {
        callback(null, xhr.response);
      } else {
        callback(status, xhr.response);
      }
    };
    xhr.send();
};

class WindowsCompositor{
    windowLayer = undefined
    movingElement = null
    xPosInit = 0
    yPosInit = 0

    //TODO refactor this to dynamic add/remove listeners
    constructor(){
        this.windowLayer = document.body.querySelector('#windows-layer')
        // if (!WebDesktopEnvironment.isMobile) {
        if (false) { //FIXME
            addEventListener("mousedown", (event) => {
                this.xPosInit = event.offsetX
                this.yPosInit = event.offsetY

                this.bringWindowToFront(event.target.closest('.StandartApplicationWindow'))

                this.catchClick(event)

            })
            addEventListener("mouseup", (event) => {
                this.movingElement = null
                this.xPosInit = 0
            })
            addEventListener("mousemove", (event) => {
            
                if (this.movingElement != null) {
                    this.dragElement(this.movingElement, event.clientX - this.xPosInit, event.clientY - this.yPosInit)
                } else {
                    
                }
            })
        }
    }
    
    /**
     * @param {HTMLElement} window
    */
   bringWindowToFront(window){
        this.windowLayer.insertBefore(this.windowLayer.lastChild, window)
    }

    /**
    * @param {MouseEvent} event
    */
    catchClick(event){
        switch (true) {
            case event.target.className == "WindowFrameTopBar":
                this.movingElement = event.target.parentElement
                break;
            default:
                break;
        }
    }

    /**
    * @param {HTMLDivElement} element
    * @param {number} posX
    * @param {number} posY
    */
    dragElement(element, posX, posY) { //TODO
        element.style.left = `${posX}px`
        element.style.top = `${posY}px`
    }
}