import {join} from 'path'

import {tmpdir} from 'os'

import BigNumber from 'bignumber.js'

import truncate from 'lodash/truncate'

// Amounts in Stellar don't go below 7 decimals

// So setting the EXPONENTIAL_AT to 8 here ensures all toString() will show the

// numbers in full form. eg. 0.0000001 (not 1e7) which is what we want for

// formatAmount().

BigNumber.config({EXPONENTIAL_AT: 20})

const shortAddress = (address, length = 4) => address.substring(0, length)

const shortHash = (hash, length = 10) => truncate(hash, {length})

const isDefInt = (obj, key) => {

if (!obj || !key || obj.hasOwnProperty(key) === false) return false

return Number.isInteger(Number(obj[key]))

}

const base64Decode = value => Buffer.from(value, 'base64').toString()

const base64DecodeToHex = value => Buffer.from(value, 'base64').toString('hex')

// Extract asset issuer address from keys in the form <code>-<issuer>

const assetKeyToIssuer = key => key.substring(key.indexOf('-') + 1)

const handleFetchDataFailure = id => e => {

let status

if (e.data && e.data.status) status = e.data.status

else if (e.response && e.response.status) status = e.response.status

let msg = 'Failed to fetch data:'

if (status) msg += `\n\tStatus: [${status}]`

if (e.response && e.response.status)

msg += `\n\tStatus: [${e.response.status}]`

if (e.message) msg += `\n\tMessage: [${e.message}]`

if (e.stack) msg += `\n\tStack: [${e.stack}]`

console.error(msg)

console.error(`Raw Error: ${e}`)

let errorURI

if (status === 404) {

let redirectURI = '/error/not-found'

if (id) redirectURI += `/${id}`

errorURI = redirectURI

} else if (e.message === 'Network Error') {

errorURI = '/error/general/network'

} else {

errorURI = `/error/general/${id}`

}

window.location.href = errorURI

}

const storageInit = () => {

let storage

if (typeof localStorage === 'undefined' || localStorage === null) {

const storagePath = join(tmpdir(), 'steexp')

const LocalStorage = require('node-localstorage').LocalStorage

storage = new LocalStorage(storagePath)

} else {

storage = localStorage

}

return storage

}

const formatAmount = amount => {

return new BigNumber(amount).toString()

}

const setTitle = subTitle => (document.title = `Pi Blockexplorer | ${subTitle}`)

export {

assetKeyToIssuer,

base64Decode,

base64DecodeToHex,

formatAmount,

handleFetchDataFailure,

isDefInt,

setTitle,

shortAddress,

shortHash,

storageInit,

}