const {query} = require("../client")

class Change {
  /**
   * @param {string} id 
   * @param {string} model 
   * @param {string} op 
   * @param {string} author 
   * @param {Date | string | number} date
   * @param {{model:string,id:string}[]} keys '
   * @param {{type:string, [x:string]:any}[]} objects
   */
  constructor(id, model, op, author, date, keys, objects) {
    this.id = id
    this.model = model
    this.op = op
    this.author = author
    this.date = date
    this.keys = keys
    this.objects = objects
  }

  static fromData(data) {
    return new Change(data.id, data.model, data.op, data.author, data.date, data.keys, data.objects)
  }
}

class ChangesAPI {
  /**
   * Call `channels(filter)` query
   * 
   * @param {{limit:int, keys: {model:string,id:string}[]}} filter 
   * @returns {Promise<Change[]>}
   */
  list(filter = null) {
    return query(`
      query ListChanges($filter:ChangesFilter) {
        changes(filter:$filter) {
          id
          model
          op
          author
          date
          keys {
            model
            id
          }
          objects {
            type: __typename
            
            ...on Character {
              id
              name
            }

            ...on Chapter {
              id
              title
            }

            ...on Story {
              id
              name
            }

            ...on Post {
              id
              time
              nick
            }

            ...on Comment {
              chapterId
              characterName
            }
          }
        }
      }
    `, {filter}).then(({changes}) => {
       return changes.map(d => Change.fromData(d))
    })
  }
}

module.exports = { Change, changesApi: new ChangesAPI }