#!/usr/bin/env node

const Chalk = require('chalk')
const Clear = require('clear')
const Figlet = require('figlet')
const Inquirer = require('inquirer')
const Clui = require('clui')

const Assembler = require('../asm')

const replPrompt = [
    {
        name: '>',
        type: 'input',
        validate: value => value.length > 0
    },
]

// commands for the cli. these catches every user action besides assembly/disassembly of instructions
const COMMANDS = [
    {
        description: "Clear the screen",
        variants : [ 'C', 'CLEAR','CLEAR()',  ':C',  'CLR',  'CLR()' ],
        action : () => Clear()
    },
    {
        description: "Show help screen",
        variants : [ 'H', 'HELP', 'HELP()',   ':H'   ],
        action : printHelpScreen
    },
    {
        description: "Quit",
        variants : [ 'Q', 'QUIT', 'QUIT()',   ':Q',  ':Q!'   ],
        action : () => {
            console.log("Bye!")
            process.exit(0)
        }
    }
]

function printHelpScreen() {
    Clear()
    console.log("\n")
    console.log("\t" + "-".repeat(50))
    COMMANDS.forEach(c => {
        console.log("\t" + c.description + " : ")
        console.log("\t" + c.variants.join("\t"))
        console.log("\t" + "-".repeat(50))
    })
    console.log("\n")
}

if (process.argv[2] === "-h" || process.argv[2] === "--help") {
    
    printHelpScreen()

} else if (process.argv[2] === "-u") {

    const promptForInstruction = () => Inquirer.prompt(replPrompt).then(i => {

        printHelpScreen()
    
        let input = i['>'].toUpperCase()
        
        let inputIsCLICommand = false
        for (let i = 0; i < COMMANDS.length; i++) {
            const command = COMMANDS[i]
            if (command.variants.indexOf(input) !== -1) {
                inputIsCLICommand = true
                command.action()
                break
            }
        }
    
        if (inputIsCLICommand === false) {
            const spinner = new Clui.Spinner('Assembling...')
            spinner.start()
            const result = Assembler.asmLine(input)
            console.log(`Result: 0x${Number(result).toString(16)}`)
            spinner.stop()
        }
    
        promptForInstruction()
    
    })

    printHelpScreen()
    promptForInstruction()

} else {
    /* Read straight from stdin BEGIN */
    const readline = require('readline')

    const readlineInterface = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    terminal: false
    })

    readlineInterface.on('line', input => {
        const result = Assembler.asmLine(input)
        console.log(`0x${Number(result).toString(16)}`)
    })
}