import * as Wei from 'tevm/Wei'
import * as Gwei from 'tevm/Gwei'
import * as Uint from 'tevm/Uint'

// Gas price in Gwei (common format)
const gasPriceGwei = Gwei("50")  // 50 Gwei

// Convert to Wei for calculation
const gasPriceWei = Gwei.toWei(gasPriceGwei)

// Calculate total cost: gasPrice * gasUsed
const gasUsed = Uint(21_000n)
const txCostWei = Uint.times(gasPriceWei, gasUsed)

// Convert to Ether for display
const txCostEther = Wei.toEther(Wei(txCostWei))
console.log(`Cost: ${txCostEther} ETH`)  // "0.00105"

import * as Ether from 'tevm/Ether'
import * as Wei from 'tevm/Wei'

// User inputs value in Ether with decimals
const valueEther = Ether("0.5")  // 0.5 ETH

// Transaction requires Wei
const valueWei = Ether.toWei(valueEther)  // 500_000_000_000_000_000n Wei

const tx = {
  to: "0x...",
  value: valueWei,  // Wei.Type ensures correct unit
  gasPrice: Gwei.toWei(Gwei("50"))
}

export type Gwei = string & { __brand: typeof gweiSymbol }

// 1 Gwei = 10^9 Wei = 10^-9 Ether
// Gwei is a decimal string (supports fractional values)
const gwei = Gwei("1.5")  // 1.5 Gwei = 1_500_000_000 Wei

export type Ether = string & { __brand: typeof etherSymbol }

// 1 Ether = 10^18 Wei = 10^9 Gwei
// Ether is a decimal string (supports fractional values)
const ether = Ether("1.5")  // 1.5 Ether

// Typical gas prices (varies by network conditions)
const slow = Gwei("20")      // 20 Gwei
const standard = Gwei("50")  // 50 Gwei
const fast = Gwei("100")     // 100 Gwei
const urgent = Gwei("200")   // 200 Gwei

// Transfer cost (21,000 gas)
const transferCostSlow = Uint.times(
  Gwei.toWei(slow),
  Uint(21_000n)
)  // 420,000,000,000,000 Wei (0.00042 ETH)

const transferCostUrgent = Uint.times(
  Gwei.toWei(urgent),
  Uint(21_000n)
)  // 4,200,000,000,000,000 Wei (0.0042 ETH)