"use strict"
// Copyright (c) Alex Ellis 2017. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

var app = angular.module('faasGateway', ['ngMaterial', 'faasGateway.funcStore']);

app.controller("home", ['$scope', '$log', '$http', '$location', '$interval', '$filter', '$mdDialog', '$mdToast', '$mdSidenav',
    function($scope, $log, $http, $location, $interval, $filter, $mdDialog, $mdToast, $mdSidenav) {
        var FUNCSTORE_DEPLOY_TAB_INDEX = 0;
        var MANUAL_DEPLOY_TAB_INDEX = 1;

        var newFuncTabIdx = FUNCSTORE_DEPLOY_TAB_INDEX;
        $scope.functions = [];
        $scope.invocationInProgress = false;
        $scope.invocationRequest = "";
        $scope.invocationResponse = "";
        $scope.invocationStatus = "";
        $scope.invocationStart = new Date().getTime();
        $scope.roundTripDuration = "";
        $scope.invocation = {
            contentType: "text"
        };

        $scope.toggleSideNav = function() {
            $mdSidenav('left').toggle();
        };

        $scope.functionTemplate = {
            image: "",
            envProcess: "",
            network: "",
            service: "",
            envVars: {},
            labels: {}
        };

        $scope.invocation.request = "";
        var fetchFunctionsDelay = 3500;
        var queryFunctionDelay = 2500;
        
        var fetchFunctionsInterval = $interval(function() {
            refreshData();
        }, fetchFunctionsDelay);

        var queryFunctionInterval = $interval(function() {
            if($scope.selectedFunction && $scope.selectedFunction.name) {
                refreshFunction($scope.selectedFunction);
            }
        }, queryFunctionDelay);

        var refreshFunction = function(functionInstance) {
            $http.get("../system/function/" + functionInstance.name)
            .then(function(response) {
                functionInstance.ready = (response.data && response.data.availableReplicas && response.data.availableReplicas > 0);
            })
            .catch(function(err) {
                console.error(err);
            });
        };

        var showPostInvokedToast = function(message, duration) {
            $mdToast.show(
                $mdToast.simple()
                .textContent(message)
                .position("top right")
                .hideDelay(duration || 500)
            );
        };

        $scope.fireRequest = function() {
            var requestContentType = $scope.invocation.contentType == "json" ? "application/json" : "text/plain";
            if ($scope.invocation.contentType == "binary") {
                requestContentType = "binary/octet-stream";
            }

            var options = {
                url: "../function/" + $scope.selectedFunction.name,
                data: $scope.invocation.request,
                method: "POST",
                headers: { "Content-Type": requestContentType },
                responseType: $scope.invocation.contentType == "binary" ? "arraybuffer" : $scope.invocation.contentType
            };
            
            $scope.invocationInProgress = true;
            $scope.invocationResponse = "";
            $scope.invocationStatus = null;
            $scope.roundTripDuration = "";
            $scope.invocationStart = new Date().getTime()


            var tryDownload = function(data, filename) {
                var caught;
            
                try {
                    var blob = new Blob([data], { type: "binary/octet-stream" });
            
                    if (window.navigator.msSaveBlob) { // // IE hack; see http://msdn.microsoft.com/en-us/library/ie/hh779016.aspx
                        window.navigator.msSaveOrOpenBlob(blob, filename);
                    }
                    else {
                        var linkElement = window.document.createElement("a");
                        linkElement.href = window.URL.createObjectURL(blob);
                        linkElement.download = filename;
                        document.body.appendChild(linkElement);
                        linkElement.click();
                        document.body.removeChild(linkElement);
                    }
            
                } catch (ex) {
                    caught = ex;
                }
                return caught;
            }

            $http(options)
                .then(function (response) {
                    var data = response.data;
                    var status = response.status;

                    if($scope.invocation.contentType == "binary") {
                        var filename = uuidv4();

                        if($scope.selectedFunction.labels) {
                            var ext = $scope.selectedFunction.labels["com.openfaas.ui.ext"];
                            if(ext && ext.length > 0 ) {
                                filename = filename + "." + ext;
                            }
                        }

                        var caught = tryDownload(data, filename);
                        if(caught) {
                            console.log(caught);                         
                            $scope.invocationResponse = caught
                        } else {
                            $scope.invocationResponse = data.byteLength + " byte(s) received";
                        }

                    } else {

                        if (typeof data == 'object') {
                            $scope.invocationResponse = JSON.stringify(data, null, 2);
                        } else {
                            $scope.invocationResponse = data;
                        }
                    }

                    $scope.invocationInProgress = false;
                    $scope.invocationStatus = status;
                    var now = new Date().getTime();
                    $scope.roundTripDuration = (now - $scope.invocationStart) / 1000;
                    showPostInvokedToast("Success");

                }).catch(function(error1) {
                    $scope.invocationInProgress = false;
                    $scope.invocationResponse = error1.statusText + "\n" + error1.data;
                    $scope.invocationStatus = error1.status;
                    var now = new Date().getTime();
                    $scope.roundTripDuration = (now - $scope.invocationStart) / 1000;

                    showPostInvokedToast("Error");
                });
        };

        var refreshData = function() {
            var previous = $scope.functions;

            var cl = function(previousItems) {
                $http.get("../system/functions").then(function(response) {
                    if (response && response.data) {
                        if (previousItems.length != response.data.length) {
                            $scope.functions = response.data;
                            
                            // update the selected function object because the newly fetched object from the API becomes a different object
                            var filteredSelectedFunction = $filter('filter')($scope.functions, {name: $scope.selectedFunction.name}, true);
                            if (filteredSelectedFunction && filteredSelectedFunction.length > 0) {
                                $scope.selectedFunction = filteredSelectedFunction[0];
                            } else {
                                $scope.selectedFunction = undefined;
                            }
                        } else {
                            for (var i = 0; i < $scope.functions.length; i++) {
                                for (var j = 0; j < response.data.length; j++) {
                                    if ($scope.functions[i].name == response.data[j].name) {
                                        $scope.functions[i].replicas = response.data[j].replicas;
                                        $scope.functions[i].invocationCount = response.data[j].invocationCount;
                                    }
                                }
                            }
                        }
                    }
                });
            };
            cl(previous);
        }

        var fetch = function() {
            $http.get("../system/functions").then(function(response) {
                $scope.functions = response.data;
            });
        };

        $scope.showFunction = function(fn) {
            if ($scope.selectedFunction != fn) {
                $scope.selectedFunction = fn;
                $scope.invocation.request = "";
                $scope.invocationResponse = "";
                $scope.invocationStatus = "";
                $scope.invocationInProgress = false;
                $scope.invocation.contentType = "text";
                $scope.invocation.roundTripDuration = "";
            }
        };

        var showDialog = function($event) {
            var parentEl = angular.element(document.body);
            $mdDialog.show({
                parent: parentEl,
                targetEvent: $event,
                templateUrl: "templates/newfunction.html",
                locals: {
                    item: $scope.functionTemplate
                },
                controller: DialogController
            });
        };

        var DialogController = function($scope, $mdDialog, item) {
            $scope.selectedTabIdx = newFuncTabIdx;
            $scope.item = item;
            $scope.selectedFunc = null;
            $scope.closeDialog = function() {
                $mdDialog.hide();
            };

            $scope.onFuncSelected = function(func) {
                $scope.item.image = func.image;
                $scope.item.service = func.name;
                $scope.item.envProcess = func.fprocess;
                $scope.item.network = func.network;
                $scope.item.envVars = func.environment;
                $scope.item.labels = func.labels;

                $scope.selectedFunc = func;
            }
            
            $scope.onTabSelect = function(idx) {
                newFuncTabIdx = idx;
            }

            $scope.onStoreTabDeselect = function() {
                $scope.selectedFunc = null;
            }

            $scope.onManualTabDeselect = function() {
                $scope.item = {};
            }

            $scope.createFunc = function() {
                var options = {
                    url: "../system/functions",
                    data: $scope.item,
                    method: "POST",
                    headers: { "Content-Type": "application/json" },
                    responseType: "text"
                };

                $http(options)
                    .then(function(response) {
                        item.image = "";
                        item.service = "";
                        item.envProcess = "";
                        item.network = "";
                        item.envVars = {};
                        item.labels = {};

                        $scope.validationError = "";
                        $scope.closeDialog();
                        showPostInvokedToast("Function created");
                    }).catch(function(error1) {
                        showPostInvokedToast("Error");
                        $scope.selectedTabIdx = MANUAL_DEPLOY_TAB_INDEX;
                        $scope.validationError = error1.data;
                    });
            };
        };

        $scope.newFunction = function() {
            showDialog();
        };

        $scope.deleteFunction = function($event) {
            var confirm = $mdDialog.confirm()
                .title('Delete Function')
                .textContent('Are you sure you want to delete ' + $scope.selectedFunction.name + '?')
                .ariaLabel('Delete function')
                .targetEvent($event)
                .ok('OK')
                .cancel('Cancel');

            $mdDialog.show(confirm)
                .then(function() {
                    var options = {
                        url: "../system/functions",
                        data: {
                            functionName: $scope.selectedFunction.name
                        },
                        method: "DELETE",
                        headers: { "Content-Type": "application/json" },
                        responseType: "json"
                    };

                    return $http(options);
                }).then(function() {
                    showPostInvokedToast("Success");
                }).catch(function(err) {
                    if (err) {
                        // show error toast only if there actually is an err.
                        // because hitting 'Cancel' also rejects the promise.
                        showPostInvokedToast("Error");
                    }
                });
        };

        fetch();
    }
]);

function uuidv4() {
    var cryptoInstance = window.crypto || window.msCrypto; // for IE11
    return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, function(c) {
      return (c ^ cryptoInstance.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
    })
  }
  