import moment from "moment";
import momenttz from "moment-timezone";
import xl from "excel4node";

import Pages from "./Pages";

import AlbumsModel from "../models/albums";
import ErrorEvent from "../libs/error";

/**
 * Classe permettant la gestion des albums d'un utilisateur
 */
class Albums extends Pages {
    /**
     * Méthode permettant de convertir les rows en csv
     * @param {Array} rows
     *
     * @return {string}
     */
    static async convertToCsv(rows) {
        let data = "";

        data +=
            "Artiste;Titre;Genre;Styles;Pays;Année;Date de sortie;Format\n\r";

        for (let i = 0; i < rows.length; i += 1) {
            const {
                artists_sort,
                title,
                genres,
                styles,
                country,
                year,
                released,
                formats,
            } = rows[i];

            let format = "";
            for (let j = 0; j < formats.length; j += 1) {
                format += `${format !== "" ? ", " : ""}${formats[j].name}`;
            }

            data += `${artists_sort};${title};${genres.join()};${styles.join()};${country};${year};${released};${format}\n\r`;
        }

        return data;
    }

    /**
     * Méthode permettant de convertir les rows en fichier xls
     * @param {Array} rows
     *
     * @return {string}
     */
    static async convertToXls(rows) {
        const wb = new xl.Workbook();
        const ws = wb.addWorksheet("MusicTopus");

        const headerStyle = wb.createStyle({
            font: {
                color: "#FFFFFF",
                size: 11,
            },
            fill: {
                type: "pattern",
                patternType: "solid",
                bgColor: "#595959",
                fgColor: "#595959",
            },
        });
        const style = wb.createStyle({
            font: {
                color: "#000000",
                size: 11,
            },
            numberFormat: "0000",
        });

        const header = [
            "Artiste",
            "Titre",
            "Genre",
            "Styles",
            "Pays",
            "Année",
            "Date de sortie",
            "Format",
        ];
        for (let i = 0; i < header.length; i += 1) {
            ws.cell(1, i + 1)
                .string(header[i])
                .style(headerStyle);
        }

        for (let i = 0; i < rows.length; i += 1) {
            const currentRow = i + 2;
            const {
                artists_sort,
                title,
                genres,
                styles,
                country,
                year,
                released,
                formats,
            } = rows[i];

            let format = "";
            for (let j = 0; j < formats.length; j += 1) {
                format += `${format !== "" ? ", " : ""}${formats[j].name}`;
            }

            ws.cell(currentRow, 1).string(artists_sort).style(style);
            ws.cell(currentRow, 2).string(title).style(style);
            ws.cell(currentRow, 3).string(genres.join()).style(style);
            ws.cell(currentRow, 4).string(styles.join()).style(style);
            if (country) {
                ws.cell(currentRow, 5).string(country).style(style);
            }
            if (year) {
                ws.cell(currentRow, 6).number(year).style(style);
            }
            if (released) {
                ws.cell(currentRow, 7)
                    .date(momenttz.tz(released, "Europe/Paris").hour(12))
                    .style({ numberFormat: "dd/mm/yyyy" });
            }
            ws.cell(currentRow, 8).string(format).style(style);
        }

        return wb;
    }

    /**
     * Méthode permettant d'ajouter un album dans une collection
     * @param {Object} req
     * @return {Object}
     */
    static async postAddOne(req) {
        const { body, user } = req;
        const data = {
            ...body,
            discogsId: body.id,
            User: user._id,
        };
        data.released = data.released
            ? moment(data.released.replace("-00", "-01"))
            : null;
        delete data.id;

        const album = new AlbumsModel(data);

        return album.save();
    }

    /**
     * Méthode permettant de récupérer les éléments distincts d'une collection
     * @param {String} field
     * @param {ObjectId} user
     * @return {Array}
     */
    static async getAllDistincts(field, user) {
        const distincts = await AlbumsModel.find(
            {
                user,
            },
            [],
            {
                sort: {
                    [field]: 1,
                },
            }
        ).distinct(field);

        return distincts;
    }

    /**
     * Méthode permettant de récupérer la liste des albums d'une collection
     * @return {Object}
     */
    async getAll() {
        const {
            page,
            limit,
            exportFormat = "json",
            sort = "artists_sort",
            order = "asc",
            artists_sort,
            format,
        } = this.req.query;

        const where = {};

        if (artists_sort) {
            where.artists_sort = artists_sort;
        }
        if (format) {
            where["formats.name"] = format;
        }

        const count = await AlbumsModel.count({
            user: this.req.user._id,
            ...where,
        });

        let params = {
            sort: {
                [sort]: order.toLowerCase() === "asc" ? 1 : -1,
            },
        };

        if (page && limit) {
            const skip = (page - 1) * limit;

            params = {
                ...params,
                skip,
                limit,
            };
        }

        const rows = await AlbumsModel.find(
            {
                user: this.req.user._id,
                ...where,
            },
            [],
            params
        );

        switch (exportFormat) {
            case "csv":
                return Albums.convertToCsv(rows);
            case "xls":
                return Albums.convertToXls(rows);
            case "json":
            default:
                return {
                    rows,
                    count,
                };
        }
    }

    /**
     * Méthode permettant de supprimer un élément d'une collection
     * @return {Boolean}
     */
    async deleteOne() {
        const res = await AlbumsModel.findOneAndDelete({
            user: this.req.user._id,
            _id: this.req.params.itemId,
        });

        if (res) {
            return true;
        }

        throw new ErrorEvent(404, "Impossible de trouver cet album");
    }

    /**
     * Méthode permettant de créer la page "ma-collection"
     */
    async loadMyCollection() {
        const artists = await Albums.getAllDistincts(
            "artists_sort",
            this.req.user._id
        );
        const formats = await Albums.getAllDistincts(
            "formats.name",
            this.req.user._id
        );

        this.setPageContent("artists", artists);
        this.setPageContent("formats", formats);
    }

    /**
     * Méthode permettant d'afficher le détails d'un album
     */
    async loadItem() {
        const { itemId: _id } = this.req.params;
        const { _id: User } = this.req.user;
        const item = await AlbumsModel.findOne({
            _id,
            User,
        });

        this.setPageContent("item", item);
    }
}

export default Albums;