
// /plugins/svgBuilder.ts
import {readFileSync, readdirSync} from 'fs'
import {join as pathJoin} from 'path'
import {Plugin} from 'vite'

let idPrefix = ''
const svgTitle = /<svg([^>+].*?)>/
const clearHeightWidth = /(width|height)="([^>+].*?)"/g
const clearFill = /fill="[^>+].*?"/g;

const hasViewBox = /(viewBox="[^>+].*?")/g

const clearReturn = /(\r)|(\n)/g

const findSvgFile = (dir: string) => {
    const svgRes: string[] = []
    const directory = readdirSync(dir, {withFileTypes: true})
    for (const dirent of directory) {
        if (dirent?.isDirectory()) {
            svgRes.push(...findSvgFile(pathJoin(dir, dirent.name, '/')))
        } else {
            const svg = readFileSync(pathJoin(dir, dirent.name))
                .toString()
                .replace(clearReturn, '')
									.replace(clearFill,'')
                .replace(svgTitle, (_$1: string, $2: string) => {
                    let width = '0'
                    let height = '0'
                    let content = $2.replace(
                        clearHeightWidth,
                        (_s1, s2:string, s3:string) => {
                            if (s2 === 'width') {
                                width = s3
                            } else if (s2 === 'height') {
                                height = s3
                            }
                            return ''
                        }
                    )
                    if (!hasViewBox.test($2)) {
                        content += `viewBox="0 0 ${width} ${height}"`
                    }
                    return `<symbol id="${idPrefix}-${dirent.name.replace(
                        '.svg',
                        ''
                    )}" ${content}>`
                })
                .replace('</svg>', '</symbol>')
            svgRes.push(svg)
        }
    }
    return svgRes
}

const svgBuilder = (path: string, prefix = 'icon'): Plugin => {
    idPrefix = prefix
    const res = findSvgFile(path)
    return {
        name: 'svg-transform',
        transformIndexHtml(html) {
            return html.replace(
                '<body>',
                `<body><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="position: absolute; width: 0; height: 0">${res.join('')}</svg>`
            )
        }
    }
}

export default svgBuilder