const fs = require('fs');

Array.prototype.remove = function(data) {
    const dataIdx = this.indexOf(data)
    if(dataIdx >= 0) {
        this.splice(dataIdx ,1);
    }
    return this.length;
}

const extractFileNameByPath = path => path.replace(/^.*[\\\/]/, '')
const extractIndexFileNameByPath = path => {
    return path.split('/').slice(-2)[0] + '.js'
}

const isTarget = str => str.endsWith(TARGET_FORMAT)
const isDir = str => !str.includes('.')

const fetchJsFilePathByDir = dir => fs.readdirSync(dir)
    .filter( file => isTarget(file) )
    .map( fileName => `${dir}/${fileName}`)


const fetchDirInDir = dir => fs.readdirSync(dir)
.filter( file => isDir(file) )
.map( fileName => `${dir}/${fileName}`)


const processDir = dir => {
    let resultJsList = []
    const _dirs = fetchDirInDir(dir)
    const _files = fetchJsFilePathByDir(dir)

    resultJsList = [..._files]

    _dirs.forEach(__d => {
        resultJsList = [...processDir(__d), ...resultJsList]
    })

    return resultJsList
}


const TARGET_FORMAT = '.js'
const COMPONENTS_ROOT = './src/components'
const TEST_COMPONENTS_ROOT = './__tests__/components'

const com_list = processDir(COMPONENTS_ROOT)
const test_list = processDir(TEST_COMPONENTS_ROOT)

console.log(`There are ${com_list.length} ${TARGET_FORMAT} files in ${COMPONENTS_ROOT}`)
console.log(`There are ${test_list.length} ${TARGET_FORMAT} files in ${TEST_COMPONENTS_ROOT}`)
const searchInTestList = fn => {
    for(let i =0 ;i<test_list.length; i++){
        if(test_list[i].includes(fn))
            return test_list[i]
    }
    return false
}



const non_covered_com = [...com_list]
const non_covered_test = [...test_list]

com_list.forEach( filePath => {
    const fn = extractFileNameByPath(filePath)

    if(fn !=='index.js') {
        const existedTestFilePath = searchInTestList(fn)
        if(existedTestFilePath) {
            non_covered_com.remove(filePath)
            non_covered_test.remove(existedTestFilePath)
        }
    } else {
        const _fn = extractIndexFileNameByPath(filePath)
        const existedTestFilePath = searchInTestList(_fn)
        if(existedTestFilePath) {
            non_covered_com.remove(filePath)
            non_covered_test.remove(existedTestFilePath)
        }
    }
})

console.log(non_covered_com.length, ' non_covered_com: ', non_covered_com)
console.log(non_covered_test.length, ' non_covered_test: ', non_covered_test)