'use strict';

const Item = require('../model/Item');
const config = require('../data/config');

async function addItem(request, h) {
    const cache = request.server.plugins.Cache.cache;
    const config = request.server.plugins.Config.config;

    const payload = request.payload;

    let id_number = await cache.get('id_number');
    id_number = id_number ? id_number : "0";

    let item = new Item(id_number, payload.description);
    const key = {
        "segment": "to-do",
        "id": id_number
    };
    await cache.set(key, item, config.cacheTimeline); // ttl- 1 Day

    id_number = "" + (parseInt(id_number) + 1);

    await cache.set('id_number', id_number, config.cacheTimeline);

    return item;
}

async function removeItem(request, h) {

    try {
        const cache = request.server.plugins.Cache.cache;

        const id = request.params.id;
        const item = await cache.get({"id": "" + id});

        if (item === null)
            return h.response("Item doesn't exists").code(404);

        await cache.drop({'id': "" + id});

        return item;
    } catch (e) {
        console.log(e);
        return e;
    }
}

async function editItem(request, h) {

    try {

        const cache = request.server.plugins.Cache.cache;
        const config = request.server.plugins.Config.config;

        const payload = request.payload;

        const id = request.params.id + "";
        const item = await cache.get({'id': id});
        if (item === null)
            return h.response("Item doesn't exist").code(404);
        if (item.state === "COMPLETE")
            return h.response("Item already complete").code(400);

        item.state = payload.state;
        item.description = payload.description;

        const key = {
            "segment": "to-do",
            "id": id
        };
        await cache.set(key, item, config.cacheTimeline); // ttl- 1 Day
        return item;

    } catch (e) {
        console.log(e)
        return e;
    }
}

async function listItens(request, h) {
    const cache = request.server.plugins.Cache.cache;

    let id_number = await cache.get('id_number');
    id_number = id_number ? parseInt(id_number) : 0;

    const query = request.query;
    const orderBy = query.orderBy;
    const filter = query.filter;

    let list = [];
    for (let i = 0; i <= id_number; i++) {
        let item = await cache.get({
            'id': '' + i
        });
        if (item)
            list.push(item);
    }
    if (orderBy) {
        const property = (() => {
            switch (query.orderBy) {
                case 'DESCRIPTION':
                    return "description";
                case 'DATE_ADDED':
                default:
                    return "dateAdded";
            }
        })();
        list.sort((a, b) => (a[property] < b[property]) ? -1 : (a[property] > b[property]) ? 1 : 0);
    }

    if (filter)
        list = list.filter((item) => item.state === query.filter || query.filter === "ALL");

    return list;
}

module.exports = {
    addItem,
    removeItem,
    editItem,
    listItens
}