import path from 'path';
import fs from 'fs';
import mime from 'mime';

export default class {

	constructor(c = {}) {
		this.setting = Object.assign({}, {
			css: true,
			html: false,
			output: 'dist'
		}, c);
	}

	apply(op) {
		const {
			code,
			file
		} = op;
		if (code && !/app\.js/.test(file)) {
			let reg = /(\.{0,2}\/)+?(\w+?\/)+(\S+?)\.(png|jpg|gif|jpeg)(\?\w*)?/gi;
			let imgPaths = code.match(reg) || [];
			imgPaths.map(imgPath => {
				//匹配(?|&)_origin后缀，不转换为base64
				let isorigin = imgPath.match(/(\?|\&)\_origin/gi)
				if(!!isorigin) {
					op.code = op.code.replace(isorigin[0],'')
					return
				}

				imgPath = imgPath.match(/(\.{0,2}\/)+?(\w+?\/)+(\S+?)\.(png|jpg|gif|jpeg)/gi)[0]
				let pathFile = path.join(process.cwd(), this.setting.path || '', imgPath);
				try {
					let bData = fs.readFileSync(pathFile);
					let base64Str = bData.toString('base64');
					let mimeType = mime.lookup(pathFile);
					let dataUri = `data:${mimeType};base64,${base64Str}`;
					op.code = op.code.replace(imgPath, `${dataUri}`);

					let delPath = pathFile.replace("src", this.setting.output);
					fs.unlink(delPath, err => {
						if(err) {
							console.log('[权限不足] ' + delPath);
						} else {
							console.log('[成功删除] ' + delPath);
						}
					})
				} catch (e) {
					console.error('读取图片失败:', pathFile);
				}
			});
		}
		op.next();
	}
}