git ssb

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const Graph = require('generic-digraph')
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const MAX_BAL_BYTES = require('./constants.js').MAX_BAL_BYTES
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module.exports = class Environment {
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  constructor (data) {
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    const defaults = {
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      // gas tank
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      gasPrice: 0,
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      gasLimit: 0, // The gas limit for the block
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      gasRefund: 0,
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      // call infromation
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      address: new Uint8Array(20),
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      origin: new Uint8Array(20),
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      coinbase: new Uint8Array(20),
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      difficulty: new Uint8Array(20),
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      caller: new Uint8Array(20),
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      callValue: new Uint8Array(MAX_BAL_BYTES),
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      callData: new ArrayBuffer(),
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      // the ROM
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      code: new ArrayBuffer(), // the current running code
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      // output calls
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      logs: [],
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      suicideAddress: new ArrayBuffer(),
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      // more output calls
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      returnValue: new ArrayBuffer()
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    }
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    this.state = new Map()
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    if (data) {
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      data = JSON.parse(data)
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    } else {
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      data = {}
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    }
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    Object.assign(this, defaults, data)
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    if (data.accounts) {
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      this.accounts = new Graph()
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      const self = this
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      data.accounts.forEach((account) => {
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        self.accounts.set(new Uint8Array(account[0]).toString(), account[1])
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      })
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    }
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    if (data.address) {
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      this.address = new Uint8Array(data.address)
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    }
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    if (data.origin) {
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      this.origin = new Uint8Array(data.origin)
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    }
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    if (data.caller) {
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      this.caller = new Uint8Array(data.caller)
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    }
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    if (data.callValue) {
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      this.callValue = new Uint8Array(data.callValue)
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    }
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    if (data.callData) {
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      this.callData = hexStr2arrayBuf(data.callData)
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    }
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  }
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  getBalance (address) {
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    return this.accounts.getValue(address.toString()).balance
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  }
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  getCode (address) {
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    // STUB
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  }
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  getBlockHash (height) {
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    // STUB
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  }
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}
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function hexStr2arrayBuf (string) {
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  const ab = new ArrayBuffer(string.length / 2)
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  const view = new Uint8Array(ab)
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  string = [...string]
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  let temp = ''
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  string.forEach((el, i) => {
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    temp += el
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    if (i % 2) {
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      view[(i + 1) / 2 - 1] = parseInt(temp, 16)
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      temp = ''
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    }
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  })
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  return ab
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}
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