'use strict';

/* global angular:false */
/* global $:false */

angular.module('Application').controller('SystemController', ['$scope', '$location', '$timeout', 'Client', function ($scope, $location, $timeout, Client) {
    Client.onReady(function () { if (!Client.getUserInfo().isAtLeastAdmin) $location.path('/'); });

    $scope.config = Client.getConfig();
    $scope.ready = false;
    $scope.services = [];
    $scope.disks = [];
    $scope.memory = null;
    $scope.errorMessage = '';

    $scope.setError = function (context, error) {
        $scope.errorMessage = 'Error loading ' + context + ' : ' + error.message;
    };

    // http://stackoverflow.com/questions/1484506/random-color-generator-in-javascript
    function getRandomColor() {
        var letters = '0123456789ABCDEF'.split('');
        var color = '#';
        for (var i = 0; i < 6; i++ ) {
            color += letters[Math.floor(Math.random() * 16)];
        }
        return color;
    }

    var colorIndex = 0;
    var colors = [ '#2196F3', '#3995b1', '#f0ad4e', '#ff4c4c' ];
    function getNextColor() {
        if (colors[colorIndex+1]) return colors[colorIndex++];
        return getRandomColor();
    }

    function refresh(serviceName, callback) {
        callback = callback || function () {};

        Client.getService(serviceName, function (error, result) {
            if (error) Client.error(error);

            var service = $scope.services.find(function (s) { return s.name === serviceName; });
            if (!service) $scope.services.push(result);

            service.status = result.status;
            service.config = result.config;
            service.memoryUsed = result.memoryUsed;
            service.memoryPercent = result.memoryPercent;

            callback(null, service);
        });
    }

    $scope.restartService = function (serviceName) {
        function waitForActive(serviceName) {
            refresh(serviceName, function (error, result) {
                if (result.status === 'active') return;

                setTimeout(function () { waitForActive(serviceName); }, 3000);
            });
        }

        $scope.services.find(function (s) { return s.name === serviceName; }).status = 'starting';

        Client.restartService(serviceName, function (error) {
            if (error) return Client.error(error);

            // show "busy" indicator for 3 seconds to show some ui activity
            setTimeout(function () { waitForActive(serviceName); }, 3000);
        });
    };

    $scope.serviceConfigure = {
        error: null,
        busy: false,
        service: null,

        // form model
        memoryLimit: 0,
        memoryTicks: [],

        show: function (service) {
            $scope.serviceConfigure.reset();

            $scope.serviceConfigure.service = service;
            $scope.serviceConfigure.memoryLimit = service.config.memorySwap; // memory + swap

            // TODO improve those
            $scope.serviceConfigure.memoryTicks = [];

            // create ticks starting from manifest memory limit. the memory limit here is currently split into ram+swap (and thus *2 below)
            // TODO: the *2 will overallocate since 4GB is max swap that cloudron itself allocates
            $scope.serviceConfigure.memoryTicks = [];
            var npow2 = Math.pow(2, Math.ceil(Math.log($scope.memory.memory)/Math.log(2)));
            for (var i = 256; i <= (npow2*2/1024/1024); i *= 2) {
                $scope.serviceConfigure.memoryTicks.push(i * 1024 * 1024);
            }

            $('#serviceConfigureModal').modal('show');
        },

        submit: function (memoryLimit) {
            $scope.serviceConfigure.busy = true;
            $scope.serviceConfigure.error = null;

            Client.configureService($scope.serviceConfigure.service.name, { memorySwap: memoryLimit, memory: memoryLimit/2 }, function (error) {
                $scope.serviceConfigure.busy = false;
                if (error) {
                    $scope.serviceConfigure.error = error.message;
                    return;
                }

                refresh($scope.serviceConfigure.service.name);

                $('#serviceConfigureModal').modal('hide');
                $scope.serviceConfigure.reset();
            });
        },

        reset: function () {
            $scope.serviceConfigure.busy = false;
            $scope.serviceConfigure.error = null;
            $scope.serviceConfigure.service = null;

            $scope.serviceConfigure.memoryLimit = 0;
            $scope.serviceConfigure.memoryTicks = [];

            $scope.serviceConfigureForm.$setPristine();
            $scope.serviceConfigureForm.$setUntouched();
        }
    };

    $scope.reboot = {
        busy: false,
        show: function () {
            $scope.reboot.busy = false;
            $('#rebootModal').modal('show');
        },
        submit: function () {
            $scope.reboot.busy = true;

            Client.reboot(function (error) {
                if (error) return Client.error(error);

                $('#rebootModal').modal('hide');

                // trigger refetch to show offline banner
                $timeout(function () { Client.getStatus(function () {}); }, 8000);
            });
        }
    };

    function updateDiskGraphs() {
        // https://graphite.readthedocs.io/en/latest/render_api.html#paths-and-wildcards
        // on scaleway, for some reason docker devices are collected as part of collectd
        // until we figure why just hardcode popular disk devices - https://www.mjmwired.net/kernel/Documentation/devices.txt
        Client.disks(function (error, result) {
            if (error) return $scope.setError('disk', error);

            // segregate locations into the correct disks based on 'filesystem'
            result.disks.forEach(function (disk, index) {
                disk.id = index;
                disk.contains = [];

                if (disk.filesystem === result.platformDataDisk) disk.contains.push({ label: 'Platform data', id: 'platformdata', usage: 0 });
                if (disk.filesystem === result.boxDataDisk) disk.contains.push({ label: 'Box data', id: 'boxdata', usage: 0 });
                if (disk.filesystem === result.dockerDataDisk) disk.contains.push({ label: 'Docker images', id: 'docker', usage: 0 });
                if (disk.filesystem === result.mailDataDisk) disk.contains.push({ label: 'Email data', id: 'maildata', usage: 0 });
                if (disk.filesystem === result.backupsDisk) disk.contains.push({ label: 'Backup data', id: 'cloudron-backup', usage: 0 });

                const apps = Object.keys(result.apps).filter(function (appId) { return result.apps[appId] === disk.filesystem; });
                apps.forEach(function (appId) {
                    var app = Client.getCachedAppSync(appId);
                    disk.contains.push({ app: app, label: app.label || app.fqdn, id: appId, usage: 0 });
                });
            });

            $scope.disks = result.disks; // [ { filesystem, type, size, used, available, capacity, mountpoint }]

            // render data of each disk
            $scope.disks.forEach(function (disk, index) {
                // /dev/sda1 -> sda1
                // /dev/mapper/foo -> mapper_foo (see #348)
                var diskName = disk.filesystem.slice(disk.filesystem.indexOf('/', 1) + 1);
                diskName = diskName.replace(/\//g, '_');

                // use collectd instead of df data so the timeframe matches with the du data
                Client.graphs([
                    'absolute(collectd.localhost.df-' + diskName + '.df_complex-free)',
                    'absolute(collectd.localhost.df-' + diskName + '.df_complex-reserved)',
                    'absolute(collectd.localhost.df-' + diskName + '.df_complex-used)'
                ], '-1min', {}, function (error, data) {
                    if (error) return $scope.setError('disk', error);

                    disk.size = data[2].datapoints[0][0] + data[1].datapoints[0][0] + data[0].datapoints[0][0];
                    disk.free = data[0].datapoints[0][0];
                    disk.occupied = data[2].datapoints[0][0] + data[1].datapoints[0][0];

                    colorIndex = 0;
                    disk.contains.forEach(function (content) {
                        content.color = getNextColor();
                    });

                    // get disk usage data
                    var graphiteQueries = disk.contains.map(function (content) {
                        return 'absolute(collectd.localhost.du-' + content.id + '.capacity-usage)';
                    });

                    Client.graphs(graphiteQueries, '-1day', { noNullPoints: true }, function (error, data) {
                        if (error) return $scope.setError('disk', error);

                        var usageOther = disk.occupied;

                        data.forEach(function (d) {
                            var content = disk.contains.find(function (content) { return d.target.indexOf(content.id) !== -1; });
                            if (!content) return; // didn't match any content

                            var tmp = d.datapoints[d.datapoints.length-1][0];
                            content.usage = tmp;

                            // deduct from overal disk usage to track other
                            usageOther -= tmp;
                        });

                        if (index === 0) { // the root mount point is the first disk
                            disk.contains.push({
                                label: 'Everything else (Ubuntu, Swap, ...)',
                                id: 'other',
                                color: '#27CE65',
                                usage: usageOther
                            });
                        }
                    });
                });
            });
        });
    }

    Client.onReady(function () {
        Client.memory(function (error, memory) {
            if (error) console.error(error);

            $scope.memory = memory;

            updateDiskGraphs();

            Client.getServices(function (error, result) {
                if (error) return Client.error(error);

                $scope.services = result.map(function (serviceName) { return { name: serviceName }; });

                // just kick off the status fetching
                $scope.services.forEach(function (s) {
                    refresh(s.name);
                });

                $scope.ready = true;
            });
        });
    });

    Client.onReconnect(function () {
        $scope.reboot.busy = false;
    });

}]);