import { Injectable } from '@angular/core';

import { I18n } from '@ngx-translate/i18n-polyfill';

import {
  RbdConfigurationExtraField,
  RbdConfigurationSection,
  RbdConfigurationType
} from '../models/configuration';
import { ServicesModule } from './services.module';

/**
 * Define here which options should be made available under which section heading.
 * The display name and description needs to be added manually as long as Ceph does not provide
 * this information.
 */
@Injectable({
  providedIn: ServicesModule
})
export class RbdConfigurationService {
  readonly sections: RbdConfigurationSection[];

  constructor(private i18n: I18n) {
    this.sections = [
      {
        heading: this.i18n('Quality of Service'),
        class: 'quality-of-service',
        options: [
          {
            name: 'rbd_qos_bps_limit',
            displayName: this.i18n('BPS Limit'),
            description: this.i18n('The desired limit of IO bytes per second.'),
            type: RbdConfigurationType.bps
          },
          {
            name: 'rbd_qos_iops_limit',
            displayName: this.i18n('IOPS Limit'),
            description: this.i18n('The desired limit of IO operations per second.'),
            type: RbdConfigurationType.iops
          },
          {
            name: 'rbd_qos_read_bps_limit',
            displayName: this.i18n('Read BPS Limit'),
            description: this.i18n('The desired limit of read bytes per second.'),
            type: RbdConfigurationType.bps
          },
          {
            name: 'rbd_qos_read_iops_limit',
            displayName: this.i18n('Read IOPS Limit'),
            description: this.i18n('The desired limit of read operations per second.'),
            type: RbdConfigurationType.iops
          },
          {
            name: 'rbd_qos_write_bps_limit',
            displayName: this.i18n('Write BPS Limit'),
            description: this.i18n('The desired limit of write bytes per second.'),
            type: RbdConfigurationType.bps
          },
          {
            name: 'rbd_qos_write_iops_limit',
            displayName: this.i18n('Write IOPS Limit'),
            description: this.i18n('The desired limit of write operations per second.'),
            type: RbdConfigurationType.iops
          },
          {
            name: 'rbd_qos_bps_burst',
            displayName: this.i18n('BPS Burst'),
            description: this.i18n('The desired burst limit of IO bytes.'),
            type: RbdConfigurationType.bps
          },
          {
            name: 'rbd_qos_iops_burst',
            displayName: this.i18n('IOPS Burst'),
            description: this.i18n('The desired burst limit of IO operations.'),
            type: RbdConfigurationType.iops
          },
          {
            name: 'rbd_qos_read_bps_burst',
            displayName: this.i18n('Read BPS Burst'),
            description: this.i18n('The desired burst limit of read bytes.'),
            type: RbdConfigurationType.bps
          },
          {
            name: 'rbd_qos_read_iops_burst',
            displayName: this.i18n('Read IOPS Burst'),
            description: this.i18n('The desired burst limit of read operations.'),
            type: RbdConfigurationType.iops
          },
          {
            name: 'rbd_qos_write_bps_burst',
            displayName: this.i18n('Write BPS Burst'),
            description: this.i18n('The desired burst limit of write bytes.'),
            type: RbdConfigurationType.bps
          },
          {
            name: 'rbd_qos_write_iops_burst',
            displayName: this.i18n('Write IOPS Burst'),
            description: this.i18n('The desired burst limit of write operations.'),
            type: RbdConfigurationType.iops
          }
        ] as RbdConfigurationExtraField[]
      }
    ];
  }

  private static getOptionsFromSections(sections: RbdConfigurationSection[]) {
    return sections.map((section) => section.options).reduce((a, b) => a.concat(b));
  }

  private filterConfigOptionsByName(configName: string) {
    return RbdConfigurationService.getOptionsFromSections(this.sections).filter(
      (option) => option.name === configName
    );
  }

  private getOptionValueByName(configName: string, fieldName: string, defaultValue = '') {
    const configOptions = this.filterConfigOptionsByName(configName);
    return configOptions.length === 1 ? configOptions.pop()[fieldName] : defaultValue;
  }

  getWritableSections() {
    return this.sections.map((section) => {
      section.options = section.options.filter((o) => !o.readOnly);
      return section;
    });
  }

  getOptionFields() {
    return RbdConfigurationService.getOptionsFromSections(this.sections);
  }

  getWritableOptionFields() {
    return RbdConfigurationService.getOptionsFromSections(this.getWritableSections());
  }

  getOptionByName(optionName: string): RbdConfigurationExtraField {
    return this.filterConfigOptionsByName(optionName).pop();
  }

  getDisplayName(configName: string): string {
    return this.getOptionValueByName(configName, 'displayName');
  }

  getDescription(configName: string): string {
    return this.getOptionValueByName(configName, 'description');
  }
}