/**
*
*    Install global modules: yarn global add typescript ts-node
*    Install image utility libraries: npm i svgson calipers calipers-png
*    Launch with ts-node ex:
*    curl -sL <script_shortlink> -o ./c.ts && ts-node <path_to_sticker_folder> && rm ./c.ts
*
**/

const { promisify } = require('util')
const { resolve, extname, basename } = require('path')
const {
    readdir: nodeReaddir,
    readFile: nodeReadFile,
    writeFile: nodeWriteFile,
    stat: nodeStat,
    lstatSync,
} = require('fs')

const svgson = require('svgson')
const calipers = require('calipers')('png');

const readdir = promisify(nodeReaddir)
const readFile = promisify(nodeReadFile)
const writeFile = promisify(nodeWriteFile)
const stat = promisify(nodeStat)

const stickerFolder = process.argv[2]
const destinationFile = resolve('./stickers.js')

const folderNames = {
    base: 'SVG',
    thumb: '1x',
}

interface Images {
    mediaThumb: {
        uri: String
        width: 244
        height: 165
    }
    mediaBase: {
        uri: String
        width: Number
        height: Number
    }
}

interface Sticker {
    name: String
    label: String
    images: Images
}

interface Category {
    name: String
    label: String
    stickers: Array<Sticker>
}

interface StickerConfig {
    categories: Array<Category>
    replaceCategories: true
}

async function listSVGsForCategory(category: string): Promise<Array<string>> {
    try {
        const SVGFolder = resolve(stickerFolder, category, folderNames.base)

        return readdir(SVGFolder)
    } catch (e) {
        console.log(`can't read folder for ${category} category`);
        throw e
    }
}

function labelify(string: string): string {
    const capitalized: string = string.charAt(0).toUpperCase() + string.slice(1)

    return capitalized.replace(new RegExp('-', 'g'), ' ')
}

async function listCategories(folder: string): Promise<Array<string>> {
    try {
        const items: Array<string> = await readdir(folder)

        return items.filter((item): boolean => lstatSync(resolve(folder, item)).isDirectory())
    } catch (e) {
        throw e
    }
}

function getFileName(file: string): string {
    return basename(file, extname(file))
}

function isNotCategoryBadge(stickerName: string): boolean {
    return !getFileName(stickerName).endsWith('-0-cover')
}

async function getSticker(category: string, svgName: string): Promise<Sticker> {
    try {
        const filePath: string = resolve(stickerFolder, category, folderNames.base, svgName)
        const stickerName: string = getFileName(filePath)

        const svgContent: string = await readFile(filePath, 'utf8')

        let viewBox: Array<number>
        try {
            viewBox = await new Promise<Array<number>>((res) => {
                svgson(svgContent, {}, result => {
                    res(result.attrs.viewBox.split(' ').map((dimension): number => parseInt(dimension)))
                })
            })
        } catch(e) {
            // can't retrieve viewBox, maybe sticker file is just a png (this could happen with PE default stickers)
            // read dimensions and put it in a mocked viewBox
            const result = await calipers.measure(filePath)
            viewBox = [0, 0, result.pages[0].width, result.pages[0].height]
        }

        return <Sticker> {
            name: stickerName,
            label: labelify(stickerName),
            images: {
                mediaThumb: {
                    uri: `stickers/${category}/${folderNames.thumb}/${stickerName}.png`,
                    width: 244,
                    height: 165,
                },
                mediaBase: {
                    uri: `stickers/${category}/${folderNames.base}/${stickerName}${extname(filePath)}`,
                    width: viewBox[2],
                    height: viewBox[3],
                }
            }
        }
    } catch (e) {
        console.log(`can't read svg: ${svgName} in ${category} category`)
        throw e
    }
}

(async (): Promise<void> => {
    try {
        const categoriesList: Array<string> = await listCategories(stickerFolder)

        const categories: Array<Category> = await Promise.all(
            categoriesList.map(async (category): Promise<Category> => {
                const SVGs: Array<string> = await listSVGsForCategory(category)
                const stickers: Array<Sticker> = await Promise.all(
                    SVGs
                        .filter(isNotCategoryBadge)
                        .map(async (svgName): Promise<Sticker> => getSticker(category, svgName))
                )

                return <Category> {
                    name: category,
                    label: labelify(category),
                    stickers,
                }
            })
        )

        const configuration: StickerConfig = {
            categories,
            replaceCategories: true,
        }

        const stickerFileContent: string = `export default ${JSON.stringify(configuration, null, 2)}`

        await writeFile(destinationFile, stickerFileContent)
        console.log('Sticker configuration written in:', destinationFile)
    } catch (e) {
        throw e
    }
})()