//
//  ViewController.swift
//  A2Mac
//
//  Created by Tamas Rudnai on 7/25/19.
//  Copyright © 2019 GameAlloy. All rights reserved.
//

import Cocoa

class ViewController: NSViewController {

    @IBOutlet weak var display: NSTextFieldCell!
    @IBOutlet weak var speedometer: NSTextFieldCell!
    
//    static let charConvStr : String =
//        "@🄰🄱🄲🄳🄴🄵🄶🄷🄸🄹🄺🄻🄼🄽🄾🄿🅀🅁🅂🅃🅄🅅🅆🅇🅈🅉[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
//        "@🅰🅱🅲🅳🅴🅵🅶🅷🅸🅹🅺🅻🅼🅽🅾🅿🆀🆁🆂🆃🆄🆅🆆🆇🆈🆉[\\]^_⬛︎!\"#$%&'()*+,-./0123456789:;<=>?" + // FL
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"

    static let charConvStr : String =
        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_░!\"#$%&'()*+,-./0123456789:;<=>?" + // FL
        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"
    
    static let charConvTbl = Array( charConvStr )

    let textLineOfs : [Int] = [
        0x000, 0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x028, 0x0A8, 0x128, 0x1A8,
        0x228, 0x2A8, 0x328, 0x3A8, 0x050, 0x0D0, 0x150, 0x1D0, 0x250, 0x2D0, 0x350, 0x3D0
    ]
    
    var workItem : DispatchWorkItem? = nil;
    @IBAction func Power(_ sender: Any) {
//        if ( workItem != nil ) {
//            workItem!.cancel();
//            workItem = nil;
//        }
//        else {
//            workItem = DispatchWorkItem {
//                DispatchQueue.global(qos: .userInteractive).async {
////                DispatchQueue.global(qos: .userInitiated).async {
////                DispatchQueue.global(qos: .background).async {
//                    tst6502()
//                }
//            }
//            DispatchQueue.global().async(execute: workItem!);
//        }
        
        m6502_Reset()
    }
    
    @IBAction func Reset(_ sender: Any) {
//        let resetPointer = UnsafeRawBufferPointer(start: &RAM + 0x3F2, count: 2)
//        let ral = UInt16(resetPointer[0])
//        let rah = UInt16(resetPointer[1])
//        let resetAddr = rah << 8 + ral
//
//        let hex = String(resetAddr, radix: 16, uppercase: true)
//        print("reset to:\(hex)\n")
//        m6502.pc = resetAddr
        
        m6502.interrupt = SOFTRESET;
    }
    
    
    override func keyDown(with event: NSEvent) {
//        switch event.modifierFlags.intersection(.deviceIndependentFlagsMask) {
//        case [.command] where event.characters == "l",
//             [.command, .shift] where event.characters == "l":
//            print("command-l or command-shift-l")
//        default:
//            break
//        }
//        print( "key = " + (event.charactersIgnoringModifiers ?? ""))
//        print( "\ncharacter = " + (event.characters ?? ""))
        
        #if FUNCTIONTEST
        #else
        if let chars = event.characters {
            let char = chars.uppercased()[chars.startIndex]
            if let code = char.asciiValue {
                var A2code = code | 0x80
                
                switch ( code ) {
                case 13:
                    A2code = 141
                    break
                    
                default:
                    break
                }
//                print("keycode: \(code) --> \(A2code)")
                
                let kbdPointer = UnsafeMutableRawBufferPointer(start: &RAM + 0xC000, count: 1)
                kbdPointer[0] = A2code
            }
        }
        #endif
        
    }
    
    override func flagsChanged(with event: NSEvent) {
//        switch event.modifierFlags.intersection(.deviceIndependentFlagsMask) {
//        case [.shift]:
//            print("shift key is pressed")
//        case [.control]:
//            print("control key is pressed")
//        case [.option] :
//            print("option key is pressed")
//        case [.command]:
//            print("Command key is pressed")
//        case [.control, .shift]:
//            print("control-shift keys are pressed")
//        case [.option, .shift]:
//            print("option-shift keys are pressed")
//        case [.command, .shift]:
//            print("command-shift keys are pressed")
//        case [.control, .option]:
//            print("control-option keys are pressed")
//        case [.control, .command]:
//            print("control-command keys are pressed")
//        case [.option, .command]:
//            print("option-command keys are pressed")
//        case [.shift, .control, .option]:
//            print("shift-control-option keys are pressed")
//        case [.shift, .control, .command]:
//            print("shift-control-command keys are pressed")
//        case [.control, .option, .command]:
//            print("control-option-command keys are pressed")
//        case [.shift, .command, .option]:
//            print("shift-command-option keys are pressed")
//        case [.shift, .control, .option, .command]:
//            print("shift-control-option-command keys are pressed")
//        default:
//            print("no modifier keys are pressed")
//        }
    }

    
    let textBaseAddr = 0x400
    let textBufferSize = 0x400
    let textLines = 24
    let textCols = 40
    
    var frameCnt = 0
    let spaceChar : Character = " "
    let blockChar : Character = "░"
    var flashingSpace : Character = " "
    
    let textBufferPointer = UnsafeRawBufferPointer(start: &RAM + 0x400, count: 0x400)
    var txtArr = [Character](repeating: " ", count: 0x400)
    
    var s = String()
    
    func Update() {
        
        m6502_Run()
        
        frameCnt += 1
        if ( frameCnt == 15 ) {
            flashingSpace = blockChar
        }
        else if ( frameCnt >= 30 ) {
            flashingSpace = spaceChar
            frameCnt = 0
        }
        
        var txt : String = ""

        for y in 0...textLines-1 {
//            let textAddr = textBaseAddr + textLineOfs[y]
            for x in 0...textCols-1 {
                let byte = textBufferPointer[ textLineOfs[y] + x ]
                let idx = Int(byte);
                var chr = ViewController.charConvTbl[idx]
                // is it a cursor? (slashing space)
                if ( chr == blockChar ) {
                    chr = flashingSpace
                }
    //            print("byte \(index): \(chr)")
//                txt = txt + "\(chr)"
                txtArr[ y * (textCols+1) + x ] = chr
            }
            

//            for (_, byte) in textBufferPointer.enumerated() {
//                let idx = Int(byte);
//                var chr = ViewController.charConvTbl[idx]
//                // is it a cursor? (slashing space)
//                if ( chr == blockChar ) {
//                    chr = flashingSpace
//                }
//    //            print("byte \(index): \(chr)")
//                txt = txt + "\(chr)"
//            }
            
//            txt = txt + "\n"
            txtArr[ y * (textCols+1) + textCols ] = "\n"
        }
//        txtArr[ textLines * (textCols+1) + textCols ] = "\0"
        txt = String(txtArr)

        
        DispatchQueue.main.async {
            self.display.stringValue = txt;
            self.speedometer.stringValue = String(format: "%0.3lf MHz", mhz);
        }
    }

    
//    func FromBuf(ptr: UnsafeMutablePointer<UInt8>, length len: Int) -> String? {
//        // convert the bytes using the UTF8 encoding
//        if let theString = NSString(bytes: ptr, length: len, encoding: NSUTF8StringEncoding) {
//            return theString as String
//        } else {
//            return nil // the bytes aren't valid UTF8
//        }
//    }

    
    let upd = RepeatingTimer(timeInterval: 1/30)
    
    override func viewDidLoad() {
        super.viewDidLoad()

//        DispatchQueue.main.asyncAfter(deadline: .now() + 1/30, execute: {
//            self.update()
//        })

//        #if FUNCTIONTEST
//        #else
//        DispatchQueue.global(qos: .background).async {
//            self.update()
//        }
        
        upd.eventHandler = {
            self.Update()
        }
        upd.resume()
//        #endif
    }

    override var representedObject: Any? {
        didSet {
        // Update the view, if already loaded.
        }
    }

}