import { alias, equal } from '@ember/object/computed';
import { get, set } from '@ember/object';
import Component from '@ember/component';
import NodeDriver from 'shared/mixins/node-driver';
import { ajaxPromise } from 'ember-api-store/utils/ajax-promise';
import layout from './template';

let RANCHER_TEMPLATE      = 'Linux Ubuntu 14.04 LTS 64-bit';
let RANCHER_GROUP         = 'rancher-machine';
let RANCHER_INGRESS_RULES = [
  {
    startport: 22,
    endport: 22,
    cidrlist: '0.0.0.0/0',
    protocol: 'TCP'
  },
  {
    icmptype: 8,
    icmpcode: 0,
    cidrlist: '0.0.0.0/0',
    protocol: 'ICMP'
  }
];

export default Component.extend(NodeDriver, {
  layout,
  driverName: 'exoscale',
  model: null,
  config: alias('model.exoscaleConfig'),
  step: 1,

  allDiskSizes             : null,
  allInstanceProfiles      : null,

  allSecurityGroups        : null,
  selectedSecurityGroup    : null,
  defaultSecurityGroup     : null,
  defaultSecurityGroupName : RANCHER_GROUP,
  whichSecurityGroup       : 'default',
  isCustomSecurityGroup    : equal('whichSecurityGroup','custom'),
  exoscaleApi              : 'api.exoscale.ch/compute',

  bootstrap() {
    const config = get(this,'globalStore').createRecord({
      type: 'exoscaleConfig',
      exoscaleApiKey: '',
      exoscaleApiSecretKey: '',
      diskSize: 50,
      instanceProfile: 'small',
      securityGroup: 'rancher-machine'
    });

    const model = get(this, 'model');
    set(model, 'exoscaleConfig', config);
  },

  init() {
    this._super();

    const cur = get(this,'config.securityGroup');
    if (cur === RANCHER_GROUP) {
      this.setProperties({
        whichSecurityGroup: 'default',
        selectedSecurityGroup: null
      });
    } else {
      this.setProperties({
        whichSecurityGroup: 'custom',
        selectedSecurityGroup: cur
      });
    }
  },

  actions: {
    /* Login step */
    exoscaleLogin() {
      set(this,'errors', null);
      set(this,'step', 2);

      set(this,'config.exoscaleApiKey', (get(this,'config.exoscaleApiKey')||'').trim());
      set(this,'config.exoscaleApiSecretKey', (get(this,'config.exoscaleApiSecretKey')||'').trim());

      this.apiRequest('listSecurityGroups').then((res) => {
        let groups       = [];
        let defaultGroup = null;

        /* Retrieve the list of security groups. */
        (res.listsecuritygroupsresponse.securitygroup || [])
          .forEach((group) => {
            let obj = {
              id          : group.id,
              name        : group.name,
              description : group.description,
              isDefault   : group.name === get(this,'defaultSecurityGroupName')
            };

            groups.push(obj);
            if (obj.isDefault && !defaultGroup) {
              defaultGroup = obj;
            }
          });

        /* Move to next step */
        set(this,'step', 3);
        set(this,'allSecurityGroups', groups);
        set(this,'defaultSecurityGroup', defaultGroup);
        set(this,'selectedSecurityGroup', get(this,'config.securityGroup') || get(this,'allSecurityGroups.firstObject.id'));
      }, (err) => {
        let errors = get(this,'errors')||[];
        errors.pushObject(this.apiErrorMessage(err,
          'listsecuritygroupsresponse',
          'While requesting security groups',
          'Authentication failure: please check the provided access credentials'
        ));
        set(this,'errors', errors);
        set(this,'step', 1);
      });
    },

    /* Security group selection */
    selectSecurityGroup() {
      set(this,'errors',null);

      /* When selecting a custom security group, we don't have to do anything more */
      if (get(this,'isCustomSecurityGroup')) {
        set(this,'config.securityGroup', get(this,'selectedSecurityGroup'));
        this.fetchInstanceSettings();
        return;
      }

      /* Otherwise, do we need to create the default security group? */
      set(this,'config.securityGroup', get(this,'defaultSecurityGroupName'));
      let group = get(this,'defaultSecurityGroup');
      if (group) {
        /* Already exists, we assume that it contains the appropriate rules */
        set(this,'config.securityGroup', group.name);
        this.fetchInstanceSettings();
        return;
      }

      /* We need to create the security group */
      set(this,'step', 4);
      this.apiRequest('createSecurityGroup', {
        name        : get(this,'defaultSecurityGroupName'),
        description : get(this,'settings.appName') + ' default security group'
      }).then((res) => {
        return async.eachSeries(RANCHER_INGRESS_RULES, (item, cb) => {
          item.securitygroupid = res.createsecuritygroupresponse.securitygroup.id;
          this.apiRequest('authorizeSecurityGroupIngress', item)
            .then(() => {
              return cb();
            }, (err) => {
              return cb(err);
            });
        }, (err) => {
          if (err) {
            let errors = get(this,'errors')||[];
            errors.pushObject(this.apiErrorMessage(err,
              'authorizesecuritygroupingressresponse',
              'While setting default security group',
              'Unable to configure the default security group'
            ));
            set(this,'errors', errors);
            set(this,'step', 3);
          } else {
            this.fetchInstanceSettings();
          }
        });
      }, (err) => {
          let errors = get(this,'errors')||[];
          errors.pushObject(this.apiErrorMessage(err,
            'createsecuritygroupresponse',
            'While creating default security group',
            'Unable to create the default security group'
          ));
          set(this,'errors', errors);
          set(this,'step', 3);
      });
    }
  },

  fetchInstanceSettings() {
    set(this,'step', 5);

    /* First, get a list of templates to get available disk sizes */
    this.apiRequest('listTemplates', {
      templatefilter : 'featured',
      name           : RANCHER_TEMPLATE
    }).then((res) => {
      set(this,'allDiskSizes',
        res.listtemplatesresponse.template
          .map((item) => Math.round(item.size / 1024 / 1024 / 1024))
          .sort((a, b) => (a - b)).uniq()
      );

      /* Also get the instance types */
      return this.apiRequest('listServiceOfferings', {
        issystem: 'false'
      }).then((res) => {
        set(this,'allInstanceProfiles',
          res.listserviceofferingsresponse.serviceoffering.sort((a, b) => {
            if (a.memory < b.memory) {
              return -1;
            }
            if (b.memory < a.memory) {
              return 1;
            }
            return 0;
          }).map((item) => {
            return { name: item.name, displaytext: item.displaytext }
          }));

        set(this,'step', 6);
      }).catch((err) => {
        let errors = get(this,'errors')||[];
        errors.pushObject(this.apiErrorMessage(err,
          'listserviceofferingsresponse',
          'While getting list of instance types',
          'Unable to get list of instance types'
        ));
        set(this,'errors', errors);
        set(this,'step', 3);
      });
    }).catch((err) => {
      let errors = get(this,'errors')||[];
      errors.pushObject(this.apiErrorMessage(err,
        'listtemplatesresponse',
        'While getting list of available images',
        'Unable to get list of available images'
      ));
      set(this,'errors', errors);
      set(this,'step', 3);
    });
  },

  apiErrorMessage(err, kind, prefix, def) {
    let answer = (err.xhr || {}).responseJSON || {};
    let text   = (answer[kind] || {}).errortext;
    if (text) {
      return prefix + ": " + text;
    } else {
      return def;
    }
  },

  apiRequest(command, params) {
    let url         = get(this,'app.proxyEndpoint') + '/' + this.exoscaleApi;
    params          = params || {};
    params.command  = command;
    params.apiKey   = get(this,'config.exoscaleApiKey');
    params.response = 'json';

    return ajaxPromise({url: url,
      method: 'POST',
      dataType: 'json',
      data: params,
      headers: {
        'Accept': 'application/json',
        'X-API-Headers-Restrict': 'Content-Length'
      },
      beforeSend: (xhr, settings) => {
        // Append 'rancher:' to Content-Type
        xhr.setRequestHeader('Content-Type',
                              'rancher:' + settings.contentType);

        // Compute the signature
        let qs = settings.data.split('&')
              .map((q) => q.replace(/\+/g, '%20'))
              .map(Function.prototype.call, String.prototype.toLowerCase)
              .sort()
              .join('&');
        settings.data += '&signature=' + encodeURIComponent(AWS.util.crypto.hmac(
          get(this,'config.exoscaleApiSecretKey'), qs, 'base64', 'sha1'));
        return true;
      },
    }, true);
  },
});