var TorrentsMod = {
    // Variables that can be modified to change the dom interactions
    show_hide_button: "show_actions",
    btn_class_action: "cb_action",
    btn_class_submit: "cb_submit",
    progress_bar_id: "progress_modtool",
    status_input_name: "status_id",
    owner_input_name: "owner_id",
    category_input_name: "category_id",
    delete_btn: "delete",
    lock_delete_btn: "lock_delete",
    edit_btn: "edit",
    refreshTimeout: 3000,
    // Internal variables used for processing the request
    selected: [],
    queued: [],
    unique_id:1,
    error_count:0,
    progress_count: 0,
    progress_max: 0,
    pause: false,
    enabled: false,

    // Init method
    Create: function() {
        var sh_btn = document.getElementById(TorrentsMod.show_hide_button);
        var btn_actions = document.getElementsByClassName(this.btn_class_action)
        var btn_submit = document.getElementsByClassName(this.btn_class_submit)
        btn_submit[0].disabled = true;
        for (var i=0; i < btn_actions.length; i++) {
            btn_actions[i].disabled = true;
            switch (btn_actions[i].id) {
                case this.delete_btn:
                    btn_actions[i].addEventListener("click", this.Delete)
                    break;
                case this.lock_delete_btn:
                    btn_actions[i].addEventListener("click", this.LockDelete)
                    break;
                case this.edit_btn:
                    btn_actions[i].addEventListener("click", this.Edit)
                    break;
                default:
                    break;
            }
        }
        for (var i=0; i < this.checkboxes.length; i++) {
            checkbox = this.checkboxes[i];
            checkbox.addEventListener("change", this.checkboxEventHandler)
        }
            sh_btn.addEventListener("click", function(e) {
            var divActions = this.nextElementSibling;
            if (divActions.style.display == "inline") {
                TorrentsMod.enabled = false;
            } else {
                TorrentsMod.enabled = true;
            }
            divActions.style.display = (TorrentsMod.enabled) ? "inline" : "none";
            var td_cbs = document.getElementsByClassName("tr-cb")
            for (var i=0; i < td_cbs.length; i++) {
                td_cb = td_cbs[i];
                td_cb.style.display = (TorrentsMod.enabled) ? "table-cell" : "none";
            }
            var toggleText = this.dataset.toggleText;
            this.dataset.toggleText = this.innerText;
            this.innerText = toggleText;
        });
    },
    // generate a unique id for a query
    getId: function(){
        return this.unique_id++;
    },

    // UI Methods
    selectAll: function(bool) {
        var l = TorrentsMod.checkboxes.length;
        for (var i = 0; i < l; i++) {
            TorrentsMod.checkboxes[i].checked = bool;
            TorrentsMod.checkboxEventHandlerFunc(TorrentsMod.checkboxes[i]);
        }
    },
    disableBtnActions: function() {
        var btn_actions = document.getElementsByClassName(this.btn_class_action)
        for (var i=0; i < btn_actions.length; i++) {
            btn_actions[i].disabled = true;
        }
    },
    enableBtnActions: function() {
        var btn_actions = document.getElementsByClassName(this.btn_class_action)
        for (var i=0; i < btn_actions.length; i++) {
            btn_actions[i].disabled = false;
        }
    },
    enableBtnSubmit: function() {
        var btn_submit = document.getElementsByClassName(this.btn_class_submit)
        btn_submit[0].disabled = false;
    },
    enableApplyChangesBtn: function() {
        var btn_apply_changes = document.getElementById("confirm_changes");
        btn_apply_changes.disabled=false;
    },
    disableBtnSubmit: function() {
        var btn_submit = document.getElementsByClassName(this.btn_class_submit)
        btn_submit[0].disabled = true;
    },
    disableApplyChangesBtn: function() {
        var btn_apply_changes = document.getElementById("confirm_changes");
        btn_apply_changes.disabled=true;
    },
    removeDivFromList: function(i) {
        var queueAction = this.queued[i];
        var parentDiv = document.getElementById(queueAction.unique_id).parentNode;
        parentDiv.removeChild(document.getElementById(queueAction.unique_id));
    },
    removeFromParent: function(el) {
        var parentDiv = el.parentNode;
        parentDiv.removeChild(el);
    },
    generatingModal: function() {
        listLength = this.queued.length;
        var div = {"edit": "", "delete": ""};
        for (var i=0; i < listLength; i++) {
            var listHTML = "";
            for(key in this.queued[i].selection) {
                var selection = this.queued[i].selection[key];
                selection.key = i;
                listHTML += Templates.Render("torrents."+this.queued[i].action+".item", selection);
            }
            this.queued[i].list = listHTML;
            this.queued[i].key = i;
            div[this.queued[i].action] += Templates.Render("torrents."+this.queued[i].action+".block", this.queued[i]);
        }
        this.progress_count = 0;
        this.progress_max = listLength;
        document.querySelector(".modal .edit_changes").innerHTML = div["edit"];
        document.querySelector(".modal .delete_changes").innerHTML = div["delete"];
    },
    toggleList: function(el) {
        el.parentNode.nextSibling.style.display = (el.parentNode.nextSibling.style.display != "block") ? "block" : "none"
    },
    addToLog: function(type, msg) {
        var logDiv = document.querySelector(".modal .logs_mess");
        if (logDiv.style.display == "none") logDiv.style.display = "block"
        logDiv.innerHTML += Templates.Render("torrents.logs."+type, msg);
    },
    updateProgressBar: function() {
        document.querySelector("#"+this.progress_bar_id).style.display = "block";
        var progress_green = document.querySelector("#"+this.progress_bar_id+" .progress-green");
        var perc = this.progress_count/this.progress_max*100;
        progress_green.style.width=perc+"%";
        progress_green.innerText = this.progress_count+"/"+this.progress_max;
    },
    resetModal: function() {
        var logDiv = document.querySelector(".modal .logs_mess");
        logDiv.style.display = "none";
        document.querySelector("#"+this.progress_bar_id).style.display = "none";
        logDiv.innerHTML = "";
        document.querySelector(".modal .edit_changes").innerHTML = "";
        document.querySelector(".modal .delete_changes").innerHTML = "";
        this.enableApplyChangesBtn();
    },
    statusToClassName: function(status) {
        var className = ["", "normal", "remake", "trusted", "aplus", ""]
        return className[status];
    },

    // Selection Management Methods
    addToSelection: function (torrent) {
        this.selected[torrent.id] = torrent;
    },
    removeFromSelection: function(torrent) {
        delete this.selected[torrent.id];
        for (t in this.selected) {
            return
        }
        this.selected = [];
    },

    // Query Queue Management Methods
    AddToQueue: function(QueueAction) {
        QueueAction.unique_id = this.getId(); // used for DOM interaction
        this.queued.push(QueueAction);
        this.enableBtnSubmit()
    },
    RemoveFromQueueAfterItems: function(i) {
        for (t in this.queued[i].selection) {
            this.RemoveItemFromQueue(i, t);
        }
    },
    RemoveFromQueue: function(i) {
        this.progress_max = (this.progress_max - 1 >= 0) ? this.progress_max-1 : 0;
        this.RemoveFromQueueAction(i)
        return false;
    },
    RemoveFromQueueAction: function(i) {
        this.removeFromParent(document.getElementById("list_"+this.queued[i].unique_id));
        this.queued.splice(i, 1);
        if (this.queued.length == 0) {
             this.disableBtnSubmit();
             if (this.progress_max>0) {
                 this.disableApplyChangesBtn();
             } else {
                 Modal.CloseActive();
             }
        }
    },
    formatSelectionToQuery: function(selection) {
        var format = "";
        for (s in selection) {
            format += "&torrent_id="+selection[s].id
        }
        return (format != "") ? format.substr(1) : ""
    },
    RemoveItemFromQueue: function(i, id) {
        this.removeFromParent(document.getElementById("list_item_"+id));
        delete this.queued[i].selection[id];
        document.getElementById("torrent_cb_"+id).checked=false;
        document.getElementById("torrent_"+id).style.display="";
        var test = 0;
        for (t in this.queued[i].selection) {
            test++
            break;
        }
        if (test == 0) this.RemoveFromQueue(i);
        return false;
    },
    newQueryAttempt: function(queryUrl, queryPost, callback) {
        Query.Post(queryUrl, queryPost, function (response) {
            if ((response.length == 0)||(!response.ok)) { // Query has failed
                var errorMsg = response.errors.join("<br>");
                TorrentsMod.addToLog("error", errorMsg);
                TorrentsMod.error_count++;
                if (TorrentsMod.error_count < 2) {
                    TorrentsMod.addToLog("success", T.r("try_new_attempt"));
                    TorrentsMod.newQueryAttempt(queryUrl, queryPost, callback)
                } else {
                    TorrentsMod.addToLog("error", T.r("query_is_broken", queryUrl, queryPost));
                    if (callback != undefined) {
                        TorrentsMod.addToLog("error", "Passing to the next query...");
                        callback(response) // So we can query only one item
                    }
                }
            } else {
                var succesMsg = (response.infos != null) ? response.infos.join("<br>") : T.r("query_executed_success");
                TorrentsMod.addToLog("success", succesMsg) 
                if (callback != undefined) callback(response) // So we can query only one item
            }
        });
    },
    QueryQueue: function(i, callback) {
        if (this.queued.length > 0) {
            var QueueAction = this.queued[i]; // we clone it so we can delete it safely
            this.RemoveFromQueueAction(i);
            var queryPost = "";
            var queryUrl = "/mod/api/torrents";
            QueueAction.queryPost = TorrentsMod.formatSelectionToQuery(QueueAction.selection)
            if (QueueAction.action == "delete") {
                queryPost="action="+QueueAction.action;
                queryPost+="&withreport="+QueueAction.withReport;
                queryPost += "&status="+((QueueAction.status != undefined) ? QueueAction.status : "");
                queryPost += "&"+QueueAction.queryPost; // we add torrent id
            } else if (QueueAction.action == "edit") {
                queryPost="action=multiple";
                queryPost += "&status="+QueueAction.status;
                queryPost += "&owner="+QueueAction.owner;
                queryPost += "&category="+QueueAction.category;
                queryPost += "&"+QueueAction.queryPost; // we add torrent id
            }
            TorrentsMod.newQueryAttempt(queryUrl, queryPost, callback)
        } else {
            TorrentsMod.addToLog("success", T.r("all_operations_done"))
            if (TorrentsMod.refreshTimeout > 0) {
                TorrentsMod.addToLog("success", T.r("refreshing_in", TorrentsMod.refreshTimeout/1000))
                setTimeout(function(){
                    window.location.reload()
                }, TorrentsMod.refreshTimeout);
            }
        }
    },
    QueryLoop: function() {
        if (TorrentsMod.progress_count <= TorrentsMod.progress_max) {
            TorrentsMod.updateProgressBar()
            TorrentsMod.progress_count++;
            if (TorrentsMod.progress_count > TorrentsMod.progress_max) TorrentsMod.progress_count = TorrentsMod.progress_max;
            TorrentsMod.QueryQueue(0, TorrentsMod.QueryLoop);
        }
    },

    // Event Handlers
    checkboxEventHandler: function(e) {
        var el = e.target;
        TorrentsMod.checkboxEventHandlerFunc(el);
    },
    checkboxEventHandlerFunc: function(el) {
        var name = el.dataset.name;
        var id = el.value;
        if (el.checked) TorrentsMod.addToSelection({name:name, id:id});
        else TorrentsMod.removeFromSelection({name:name, id:id});
        if (TorrentsMod.selected.length > 0) TorrentsMod.enableBtnActions();
        else TorrentsMod.disableBtnActions();
    },

    // Action Methods
    DeleteHandler: function(locked) {
        var withReport = confirm(T.r("delete_reports_with_torrents"))
        var selection = TorrentsMod.selected;
        if (locked)
        TorrentsMod.AddToQueue({ action: "delete",
        withReport: withReport, 
        selection: selection,
        queryPost: "",
        infos: T.r("with_lock")+ ((withReport) ? T.r("and_reports") : ""),
        status: "5" });
        else TorrentsMod.AddToQueue({
            action: "delete",
            withReport: withReport,
            selection: selection,
            infos: (withReport) ? T.r("with_reports") : "",
            queryPost: ""});
        for (i in selection) document.getElementById("torrent_"+i).style.display="none";
        TorrentsMod.selected = []
        TorrentsMod.disableBtnActions();
    },
    Delete: function(e) {
        TorrentsMod.DeleteHandler(false);
        e.preventDefault();
    },
    LockDelete: function(e) {
        TorrentsMod.DeleteHandler(true);
        e.preventDefault();
    },
    Edit: function(e) {
        var selection = TorrentsMod.selected;
        var status = document.querySelector(".modtools *[name='"+TorrentsMod.status_input_name+"']").value;
        var owner_id = document.querySelector(".modtools *[name='"+TorrentsMod.owner_input_name+"']").value;
        var category = document.querySelector(".modtools *[name='"+TorrentsMod.category_input_name+"']").value;
        var infos = "";
        infos += (status != "") ? T.r("status_js", status) : "";
        infos += (owner_id != "") ? T.r("owner_id_js", owner_id) : "";
        infos += (category != "") ? T.r("category_js", category) : "";
        TorrentsMod.AddToQueue({
            action: "edit",
            selection: selection,
            queryPost: "", // We don't format now, we wait until the query is sent
            infos: (infos != "" ) ? T.r("with_st", infos) : T.r("no_changes"),
            status: status,
            category: category,
            owner: owner_id });
        if (status != "") {
            for (i in selection) document.getElementById("torrent_"+i).className="torrent-info "+TorrentsMod.statusToClassName(status);
        }
        TorrentsMod.selected = []
        TorrentsMod.disableBtnActions();
        e.preventDefault();
    },
    ApplyChanges: function() {
        this.pause = false;
        this.QueryLoop();
    }
};

// Load torrentMods when DOM is ready
document.addEventListener("DOMContentLoaded", function() {
    TorrentsMod.checkboxes =  document.querySelectorAll("input[name='torrent_id']");
    TorrentsMod.Create();
});