import { inject as service } from '@ember/service';
import { not } from '@ember/object/computed';
import Component from '@ember/component';
import { computed } from '@ember/object';

export default Component.extend({
  classNames: 'config-pki-ca',
  store: service('store'),
  flashMessages: service(),

  /*
   * @param boolean
   * @private
   * bool that gets flipped if you have a CA cert and click the Replace Cert button
   */
  replaceCA: false,

  /*
   * @param boolean
   * @private
   * bool that gets flipped if you push the click the "Set signed intermediate" button
   */
  setSignedIntermediate: false,

  /*
   * @param boolean
   * @private
   * bool that gets flipped if you push the click the "Set signed intermediate" button
   */
  signIntermediate: false,

  /*
   * @param boolean
   * @private
   *
   * true when there's no CA cert currently configured
   */
  needsConfig: not('config.pem'),

  /*
   * @param DS.Model
   * @private
   *
   * a `pki-ca-certificate` model used to back the form when uploading or creating a CA cert
   * created and set on `init`, and unloaded on willDestroy
   *
   */
  model: null,

  /*
   * @param DS.Model
   * @public
   *
   * a `pki-config` model - passed in in the component useage
   *
   */
  config: null,

  /*
   * @param Function
   * @public
   *
   * function that gets called to refresh the config model
   *
   */
  onRefresh() {},

  loading: false,

  willDestroy() {
    const ca = this.get('model');
    if (ca) {
      ca.unloadRecord();
    }
    this._super(...arguments);
  },

  createOrReplaceModel(modelType) {
    const ca = this.get('model');
    const config = this.get('config');
    const store = this.get('store');
    const backend = config.get('backend');
    if (ca) {
      ca.unloadRecord();
    }
    const caCert = store.createRecord(modelType || 'pki-ca-certificate', {
      id: `${backend}-ca-cert`,
      backend,
    });
    this.set('model', caCert);
  },

  /*
   * @private
   * @returns array
   *
   * When a CA is configured, we let them download
   * the CA in der, pem, and the CA Chain in pem (if one exists)
   *
   * This array provides the text and download hrefs for those links.
   *
   */
  downloadHrefs: computed('config', 'config.{backend,pem,caChain,der}', function() {
    const config = this.get('config');
    const { backend, pem, caChain, der } = config.getProperties('backend', 'pem', 'caChain', 'der');

    if (!pem) {
      return [];
    }

    const pemFile = new Blob([pem], { type: 'text/plain' });
    const links = [
      {
        display: 'Download CA Certificate in PEM format',
        name: `${backend}_ca.pem`,
        url: URL.createObjectURL(pemFile),
      },
      {
        display: 'Download CA Certificate in DER format',
        name: `${backend}_ca.der`,
        url: URL.createObjectURL(der),
      },
    ];
    if (caChain) {
      const caChainFile = new Blob([caChain], { type: 'text/plain' });
      links.push({
        display: 'Download CA Certificate Chain',
        name: `${backend}_ca_chain.pem`,
        url: URL.createObjectURL(caChainFile),
      });
    }
    return links;
  }),

  actions: {
    saveCA(method) {
      this.set('loading', true);
      const model = this.get('model');
      const isUpload = this.get('model.uploadPemBundle');
      model
        .save({ adapterOptions: { method } })
        .then(m => {
          if (method === 'setSignedIntermediate' || isUpload) {
            this.send('refresh');
            this.get('flashMessages').success('The certificate for this backend has been updated.');
          } else if (!m.get('certificate') && !m.get('csr')) {
            // if there's no certificate, it wasn't generated and the generation was a noop
            this.get('flashMessages').warning(
              'You tried to generate a new root CA, but one currently exists. To replace the existing one, delete it first and then generate again.'
            );
          }
        })
        .catch(() => {
          // handle promise rejection - error will be shown by message-error component
        })
        .finally(() => {
          this.set('loading', false);
        });
    },
    deleteCA() {
      this.set('loading', true);
      const model = this.get('model');
      const backend = model.get('backend');
      //TODO Is there better way to do this? This forces the saved state so Ember Data will make a server call.
      model.send('pushedData');
      model
        .destroyRecord()
        .then(() => {
          this.get('flashMessages').success(
            `The CA key for ${backend} has been deleted. The old CA certificate will still be accessible for reading until a new certificate/key are generated or uploaded.`
          );
        })
        .finally(() => {
          this.set('loading', false);
          this.send('refresh');
          this.createOrReplaceModel();
        });
    },
    refresh() {
      this.setProperties({
        setSignedIntermediate: false,
        signIntermediate: false,
        replaceCA: false,
      });
      this.get('onRefresh')();
    },
    toggleReplaceCA() {
      if (!this.get('replaceCA')) {
        this.createOrReplaceModel();
      }
      this.toggleProperty('replaceCA');
    },
    toggleVal(name, val) {
      if (!name) {
        return;
      }
      const model = name === 'signIntermediate' ? 'pki-ca-certificate-sign' : null;
      if (!this.get(name)) {
        this.createOrReplaceModel(model);
      }
      if (val !== undefined) {
        this.set(name, val);
      } else {
        this.toggleProperty(name);
      }
    },
  },
});