/*
 * Copyright 2021 Lightbend Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { Metadata } from './metadata';

/**
 * CloudEvent data.
 */
export class Cloudevent {
  readonly metadata: Metadata;

  constructor(metadata: Metadata) {
    this.metadata = metadata;
  }

  get specversion(): string | undefined {
    return this.getString('ce-specversion');
  }

  get id(): string | undefined {
    return this.getString('ce-id');
  }

  set id(id: string | undefined) {
    if (id === undefined) {
      this.metadata.delete('ce-id');
    } else {
      this.metadata.asMap['ce-id'] = id;
    }
  }

  get source(): string | undefined {
    return this.getString('ce-source');
  }

  set source(source: string | undefined) {
    if (source === undefined) {
      this.metadata.delete('ce-source');
    } else {
      this.metadata.asMap['ce-source'] = source;
    }
  }

  get type(): string | undefined {
    return this.getString('ce-type');
  }

  set type(type: string | undefined) {
    if (type === undefined) {
      this.metadata.delete('ce-type');
    } else {
      this.metadata.asMap['ce-type'] = type;
    }
  }

  get datacontenttype(): string | undefined {
    return this.getString('Content-Type');
  }

  set datacontenttype(datacontenttype: string | undefined) {
    if (datacontenttype === undefined) {
      this.metadata.delete('Content-Type');
    } else {
      this.metadata.asMap['Content-Type'] = datacontenttype;
    }
  }

  get dataschema(): string | undefined {
    return this.getString('ce-dataschema');
  }

  set dataschema(dataschema: string | undefined) {
    if (dataschema === undefined) {
      this.metadata.delete('ce-dataschema');
    } else {
      this.metadata.asMap['ce-subject'] = dataschema;
    }
  }

  get subject(): string | undefined {
    return this.getString('ce-subject');
  }

  set subject(subject: string | undefined) {
    if (subject === undefined) {
      this.metadata.delete('ce-subject');
    } else {
      this.metadata.asMap['ce-subject'] = subject;
    }
  }

  get time(): Date | undefined {
    const value = this.metadata.asMap['ce-time'];
    if (typeof value === 'string') {
      try {
        return new Date(Date.parse(value));
      } catch (e) {
        return undefined;
      }
    }
    return undefined;
  }

  set time(time: Date | undefined) {
    if (time === undefined) {
      this.metadata.delete('ce-time');
    } else {
      this.metadata.asMap['ce-time'] = (time as Date).toISOString();
    }
  }

  private getString(name: string): string | undefined {
    const value = this.metadata.asMap[name];
    if (typeof value === 'string') {
      return value as string;
    }
    return undefined;
  }
}