const path = require('path');
const _ = require('lodash');
const he = require('he');
const dayjs = require('dayjs');

const BasePage = require('./BasePage');
const Fb2Parser = require('../fb2/Fb2Parser');

class BookPage extends BasePage {
    constructor(config) {
        super(config);

        this.id = 'book';
        this.title = 'Книга';

    }

    formatSize(size) {
        size = size/1024;
        let unit = 'KB';
        if (size > 1024) {
            size = size/1024;
            unit = 'MB';
        }
        return `${size.toFixed(1)} ${unit}`;
    }

    inpxInfo(bookRec) {
        const mapping = [
            {name: 'fileInfo', label: 'Информация о файле', value: [
                {name: 'folder', label: 'Папка'},
                {name: 'file', label: 'Файл'},
                {name: 'size', label: 'Размер'},
                {name: 'date', label: 'Добавлен'},
                {name: 'del', label: 'Удален'},
                {name: 'libid', label: 'LibId'},
                {name: 'insno', label: 'InsideNo'},
            ]},

            {name: 'titleInfo', label: 'Общая информация', value: [
                {name: 'author', label: 'Автор(ы)'},
                {name: 'title', label: 'Название'},
                {name: 'series', label: 'Серия'},
                {name: 'genre', label: 'Жанр'},
                {name: 'librate', label: 'Оценка'},
                {name: 'lang', label: 'Язык книги'},
                {name: 'keywords', label: 'Ключевые слова'},
            ]},
        ];

        const valueToString = (value, nodePath, b) => {//eslint-disable-line no-unused-vars
            if (nodePath == 'fileInfo/file')
                return `${value}.${b.ext}`;

            if (nodePath == 'fileInfo/size')
                return `${this.formatSize(value)} (${value.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1 ')} Bytes)`;

            if (nodePath == 'fileInfo/date')
                return dayjs(value, 'YYYY-MM-DD').format('DD.MM.YYYY');

            if (nodePath == 'fileInfo/del')
                return (value ? 'Да' : null);

            if (nodePath == 'fileInfo/insno')
                return (value ? value : null);

            if (nodePath == 'titleInfo/author')
                return value.split(',').join(', ');

            if (nodePath == 'titleInfo/librate' && !value)
                return null;

            if (typeof(value) === 'string') {
                return value;
            }

            return (value.toString ? value.toString() : '');
        };

        let result = [];
        const book = _.cloneDeep(bookRec);
        book.series = [book.series, book.serno].filter(v => v).join(' #');

        for (const item of mapping) {
            const itemOut = {name: item.name, label: item.label, value: []};

            for (const subItem of item.value) {
                const subItemOut = {
                    name: subItem.name,
                    label: subItem.label,
                    value: valueToString(book[subItem.name], `${item.name}/${subItem.name}`, book)
                };
                if (subItemOut.value)
                    itemOut.value.push(subItemOut);
            }

            if (itemOut.value.length)
                result.push(itemOut);
        }

        return result;
    }    

    htmlInfo(title, infoList) {
        let info = '';
        for (const part of infoList) {
            if (part.value.length)
                info += `<h3>${part.label}</h3>`;
            for (const rec of part.value)
                info += `<p>${rec.label}: ${rec.value}</p>`;
        }

        if (info)
            info = `<h2>${title}</h2>${info}`;

        return info;
    }

    async body(req) {
        const result = {};

        result.link = [
            this.navLink({rel: 'start'}),
            this.acqLink({rel: 'self', href: req.originalUrl, hrefAsIs: true}),
        ];

        const bookUid = req.query.uid;
        const entry = [];
        if (bookUid) {            
            const {bookInfo} = await this.webWorker.getBookInfo(bookUid);

            if (bookInfo) {
                const {genreMap} = await this.getGenres();
                const fileFormat = `${bookInfo.book.ext}+zip`;

                //entry
                const e = this.makeEntry({
                    id: bookUid,
                    title: bookInfo.book.title || 'Без названия',
                });

                e['dc:language'] = bookInfo.book.lang;
                e['dc:format'] = fileFormat;

                //genre
                const genre = bookInfo.book.genre.split(',');
                for (const g of genre) {
                    const genreName = genreMap.get(g);
                    if (genreName) {
                        if (!e.category)
                            e.category = [];
                        e.category.push({
                            '*ATTRS': {term: genreName, label: genreName},
                        });
                    }
                }

                let content = '';
                let ann = '';
                let info = '';
                //fb2 info
                if (bookInfo.fb2) {
                    const parser = new Fb2Parser(bookInfo.fb2);
                    const infoObj = parser.bookInfo();

                    if (infoObj.titleInfo) {
                        if (infoObj.titleInfo.author.length) {
                            e.author = infoObj.titleInfo.author.map(a => ({name: a}));
                        }

                        ann = infoObj.titleInfo.annotationHtml || '';
                        const infoList = parser.bookInfoList(infoObj);
                        info += this.htmlInfo('Fb2 инфо', infoList);
                    }
                }

                //content
                info += this.htmlInfo('Inpx инфо', this.inpxInfo(bookInfo.book));

                content = `${ann}${info}`;
                if (content) {
                    e.content = {
                        '*ATTRS': {type: 'text/html'},
                        '*TEXT': he.escape(content),
                    };
                }

                //links
                e.link = [ this.downLink({href: bookInfo.link, type: `application/${fileFormat}`}) ];
                if (bookInfo.cover) {
                    let coverType = 'image/jpeg';
                    if (path.extname(bookInfo.cover) == '.png')
                        coverType = 'image/png';

                    e.link.push(this.imgLink({href: bookInfo.cover, type: coverType}));
                    e.link.push(this.imgLink({href: bookInfo.cover, type: coverType, thumb: true}));
                }

                entry.push(e);
            }
        }

        result.entry = entry;

        return this.makeBody(result, req);
    }
}

module.exports = BookPage;