import PouchDB from 'pouchdb'
import PouchDBfind from 'pouchdb-find'

/**
 *  Repository
 *
 *  @author Björn Hase, me@herr-hase.wtf
 *  @license http://opensource.org/licenses/MIT The MIT License
 *  @link https://gitea.node001.net/HerrHase/super-hog
 *
 */

class Repository
{
    constructor()
    {
        PouchDB.plugin(PouchDBfind)
        this.db = new PouchDB('./../../storage/database', {
            revs_limit: 0
        })

        // adding index
        this.index = [
            'type'
        ]

        if (this.index && this.index.lenth > 0) {
            this.addIndex(this.index)
        }
    }

    /**
     *  add index
     *
     *  @param {array} fields
     *
     */
    async addIndex(fields)
    {
        try {
            await this.db.createIndex({
                index: {
                    fields: fields
                }
            })
        } catch (error) {
            console.log(error);
        }
    }

    /**
     *
     *
     *  @param  {array} data
     *  @param  {function} success
     *
     */
    create(data)
    {
        //data._id = uuidv4()
        data.type = this.type

        // if beforeCreate exists
        if (typeof this['beforeCreate'] === 'function') {
            data = this.beforeCreate(data)
        }

        return this.db.post(data)
            .then((response) => {

                console.log(response)

                // if afterCreate exists
                if (typeof this['afterCreate'] === 'function') {
                    this.afterCreate(response)
                }

                return response
            })
    }

    /**
     *
     *
     *  @param  {array} data
     *  @param  {function} success
     *
     */
    update(data)
    {
        // if beforeUpdate exists
        if (typeof this['beforeUpdate'] === 'function') {
            data = this.beforeUpdate(data)
        }

        return this.db.put(data)
            .then((response) => {

                // if beforeUpdate exists
                if (typeof this['afterUpdate'] === 'function') {
                    this.afterUpdate(response)
                }

                return response
            })
    }

    /**
     *
     *
     *  @param  {string} id
     *  @param  {function} success
     *
     */
    async remove(id)
    {
        this.findOne({
            'selector': {
                '_id': id
            }
        }).then((document) => {
            if (document) {

                // if beforeUpdate exists
                if (typeof this['beforeRemove'] === 'function') {
                    this.beforeRemove(document)
                }

                return this.db.remove(document._id, document._rev, () => {
                    return document
                })

                // if beforeUpdate exists
                if (typeof this['afterRemove'] === 'function') {
                    this.afterRemove(document)
                }
            }
        })
    }

    /**
     *  find documents
     *
     *  @param  {object} fields
     *  @param  {object} query
     *  @param  {function} success
     */
    find(query)
    {
        return this.db.find(query).then((documents) => {
            return documents.docs
        })
    }

    /**
     *  find documents
     *
     *  @param  {object} fields
     *  @param  {object} query
     *  @param  {function} success
     */
    findOne(query)
    {
        return this.db.find(query).then((documents) => {
            if (documents.docs.length === 0) {
                return null
            } else {
                return documents.docs[0]
            }
        })
    }
}

export default Repository