//
//  ViewController.swift
//  Steve ][
//
//  Created by Tamas Rudnai on 2/17/20.
//  Copyright © 2019, 2020 Tamas Rudnai. All rights reserved.
//
// This file is part of Steve ][ -- The Apple ][ Emulator.
//
// Steve ][ is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Steve ][ is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Steve ][.  If not, see <https://www.gnu.org/licenses/>.
//

import UIKit
import AVFoundation



let K : Double = 1000.0
let M : Double = (K * K)
let G : Double = (M * K)
let T : Double = (G * K)

let KB : Double = 1024.0
let MB : Double = (KB * KB)
let GB : Double = (MB * KB)
let TB : Double = (GB * KB)


var spk_up: AVAudioPlayer?
var spk_dn: AVAudioPlayer?

@_cdecl("ViewController_spk_up_play")
func spk_up_play() {
    spk_up?.stop()
    spk_dn?.stop()
    spk_up?.play()
}

@_cdecl("ViewController_spk_dn_play")
func spk_dn_play() {
    spk_up?.stop()
    spk_dn?.stop()
    spk_dn?.play()
}


#if METAL_YES
import Metal
#endif

class ViewController: UIViewController {

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

//    static let charConvStr : String =
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_░!\"#$%&'()*+,-./0123456789:;<=>?" + // FL
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_\u{E0A0}!\"#$%&'()*+,-./0123456789:;<=>?" +
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"
    
//    static let charConvStr : String =
//    "\u{E140}\u{E141}\u{E142}\u{E143}\u{E144}\u{E145}\u{E146}\u{E147}\u{E148}\u{E149}\u{E14A}\u{E14B}\u{E14C}\u{E14D}\u{E14E}\u{E14F}\u{E150}\u{E151}\u{E152}\u{E153}\u{E154}\u{E155}\u{E156}\u{E157}\u{E158}\u{E159}\u{E15A}\u{E15B}\u{E15C}\u{E15D}\u{E15E}\u{E15F}\u{E120}\u{E121}\u{E122}\u{E123}\u{E124}\u{E125}\u{E126}\u{E127}\u{E128}\u{E129}\u{E12A}\u{E12B}\u{E12C}\u{E12D}\u{E12E}\u{E12F}\u{E130}\u{E131}\u{E132}\u{E133}\u{E134}\u{E135}\u{E136}\u{E137}\u{E138}\u{E139}\u{E13A}\u{E13B}\u{E13C}\u{E13D}\u{E13E}\u{E13F}" +
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_░!\"#$%&'()*+,-./0123456789:;<=>?" + // FL
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_\u{E0A0}!\"#$%&'()*+,-./0123456789:;<=>?" +
//        "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"
    
    static let charConvStrFlashOff : String =
        "\u{E140}\u{E141}\u{E142}\u{E143}\u{E144}\u{E145}\u{E146}\u{E147}\u{E148}\u{E149}\u{E14A}\u{E14B}\u{E14C}\u{E14D}\u{E14E}\u{E14F}\u{E150}\u{E151}\u{E152}\u{E153}\u{E154}\u{E155}\u{E156}\u{E157}\u{E158}\u{E159}\u{E15A}\u{E15B}\u{E15C}\u{E15D}\u{E15E}\u{E15F}\u{E120}\u{E121}\u{E122}\u{E123}\u{E124}\u{E125}\u{E126}\u{E127}\u{E128}\u{E129}\u{E12A}\u{E12B}\u{E12C}\u{E12D}\u{E12E}\u{E12F}\u{E130}\u{E131}\u{E132}\u{E133}\u{E134}\u{E135}\u{E136}\u{E137}\u{E138}\u{E139}\u{E13A}\u{E13B}\u{E13C}\u{E13D}\u{E13E}\u{E13F}" +
            "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" + // FL
            "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
    "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"

    static let charConvStrFlashOn : String =
        "\u{E140}\u{E141}\u{E142}\u{E143}\u{E144}\u{E145}\u{E146}\u{E147}\u{E148}\u{E149}\u{E14A}\u{E14B}\u{E14C}\u{E14D}\u{E14E}\u{E14F}\u{E150}\u{E151}\u{E152}\u{E153}\u{E154}\u{E155}\u{E156}\u{E157}\u{E158}\u{E159}\u{E15A}\u{E15B}\u{E15C}\u{E15D}\u{E15E}\u{E15F}\u{E120}\u{E121}\u{E122}\u{E123}\u{E124}\u{E125}\u{E126}\u{E127}\u{E128}\u{E129}\u{E12A}\u{E12B}\u{E12C}\u{E12D}\u{E12E}\u{E12F}\u{E130}\u{E131}\u{E132}\u{E133}\u{E134}\u{E135}\u{E136}\u{E137}\u{E138}\u{E139}\u{E13A}\u{E13B}\u{E13C}\u{E13D}\u{E13E}\u{E13F}" +
        "\u{E140}\u{E141}\u{E142}\u{E143}\u{E144}\u{E145}\u{E146}\u{E147}\u{E148}\u{E149}\u{E14A}\u{E14B}\u{E14C}\u{E14D}\u{E14E}\u{E14F}\u{E150}\u{E151}\u{E152}\u{E153}\u{E154}\u{E155}\u{E156}\u{E157}\u{E158}\u{E159}\u{E15A}\u{E15B}\u{E15C}\u{E15D}\u{E15E}\u{E15F}\u{E120}\u{E121}\u{E122}\u{E123}\u{E124}\u{E125}\u{E126}\u{E127}\u{E128}\u{E129}\u{E12A}\u{E12B}\u{E12C}\u{E12D}\u{E12E}\u{E12F}\u{E130}\u{E131}\u{E132}\u{E133}\u{E134}\u{E135}\u{E136}\u{E137}\u{E138}\u{E139}\u{E13A}\u{E13B}\u{E13C}\u{E13D}\u{E13E}\u{E13F}" +
            "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?" +
    "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"

    static let charConvTblFlashOn  = Array( charConvStrFlashOn  )
    static let charConvTblFlashOff = Array( charConvStrFlashOff )
    
    static var charConvTbl = charConvTblFlashOn
    
    static var romFileName = "Apple2e_Enhanced.rom";

    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 SPEEDTEST
        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!);
        }
        #else
        m6502_ColdReset( Bundle.main.bundlePath, romFileName )
        #endif
    }
    
    @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;
    }
    
    
    @IBAction func Command(_ sender: UIButton) {
        
        if let label = sender.titleLabel, let command = label.text {
            for c in command {
                kbdInput(c.asciiValue! + 128);
            }
            kbdInput(Character("\r").asciiValue! + 128);
        }
        
    }
    
    
    // AppleScript Keycodes
    let leftArrowKey = 123
    let rightArrowKey = 124
    let upArrowKey = 126
    let downArrowKey = 125

//    override func keyDown(with event: UIEvent) {
////        print("KBD Event")
////        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
//        let keyCode = Int(event.keyCode)
//        switch keyCode {
//        case leftArrowKey:
//            kbdInput(0x08)
//        case rightArrowKey:
//            kbdInput(0x15)
//        case leftArrowKey:
//            kbdInput(0x0B)
//        case rightArrowKey:
//            kbdInput(0x0A)
//        default:
////            print("keycode: %d", keyCode)
//            if let chars = event.characters {
//                let char = chars.uppercased()[chars.startIndex]
//                if let ascii = char.asciiValue {
//                    kbdInput(ascii)
//                }
//            }
//        }
//        #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")
//        }
//    }

    static let textBaseAddr = 0x400
    static let textBufferSize = 0x400
    let textLines = 24
    let textCols = 40
    let lineEndChars = 1
    
    var frameCnt = 0
//    let spaceChar : Character = "\u{E17F}"
//    let blockChar : Character = "\u{E07F}"
    let spaceChar : Character = " "
    let blockChar : Character = "░"
    var flashingSpace : Character = " "
    
    let ramBufferPointer = UnsafeRawBufferPointer(start: RAM, count: 64 * 1024)
    let textBufferPointer = UnsafeRawBufferPointer(start: RAM + textBaseAddr, count: textBufferSize * 2)
    let txtClear = [Character](repeating: " ", count: textBufferSize * 2)
    var txtArr = txtClear
    
    var s = String()
    
    func HexDump() {
        var txt : String = ""
        
        for y in 0...textLines - 1 {
            txt += String(format: "%04X: ", y * 16)
            for x in 0...15 {
                let byte = ramBufferPointer[ y * 16 + x ]
                let chr = String(format: "%02X ", byte)
                txt += chr
            }
            txt += "\n"
        }
        
        DispatchQueue.main.async {
            self.displayField.text = txt
            self.speedometer.text = String(format: "%0.3lf MHz", mhz);
        }
    }
    
    
    var was = 0;
    
    func Update() {

        #if SPEEDTEST
        #else
        m6502_Run()
        #endif
        
//        render()
//        hires.compute()
        
//        HexDump()
//        return
        
        frameCnt += 1
        if ( frameCnt == fps / 2 ) {
//            flashingSpace = blockChar
            ViewController.charConvTbl = ViewController.charConvTblFlashOn
        }
        else if ( frameCnt >= fps ) {
//            flashingSpace = spaceChar
            ViewController.charConvTbl = ViewController.charConvTblFlashOff
            frameCnt = 0
        }
        
        var txt : String = ""
        
        for y in 0...textLines-1 {
//            let textAddr = textBaseAddr + textLineOfs[y]
            
//            let linePointer = UnsafeMutableRawPointer( mutating: &RAM + textBaseAddr + y * textCols ) //( start: &RAM + 0x400, count: 0x400)
//            let lineStr = String(bytesNoCopy: linePointer, length: textCols, encoding: .ascii, freeWhenDone: false)!
//            txt += lineStr + "\n"

            for x in 0...textCols-1 {
                let byte = textBufferPointer[ textLineOfs[y] + x ]
                let idx = Int(byte);
                let 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 + lineEndChars) + 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 + lineEndChars) + textCols ] = "\n"
        }
//        txtArr[ textLines * (textCols+1) + textCols ] = "\0"
        txt = String(txtArr)

        DispatchQueue.main.async {
            self.displayField.text = txt
//            self.display.stringValue = "testing\nit\nout"

            if ( (mhz < 10) && (mhz != floor(mhz)) ) {
                self.speedometer.text = String(format: "%0.3lf MHz", mhz);
            }
            else {
                self.speedometer.text = String(format: "%.0lf MHz", mhz);
            }
            
            #if HIRES
//            if ( self.was < 300 ) {
//                self.was += 1
//
//                for x in stride(from: 0, to: 280, by: 7) {
//                    for y in stride(from: 0, to: 192, by: 8) {
//                        self.hires.setNeedsDisplay( CGRect(x: x, y: y, width: 7, height: 8) )
//                    }
//                }
//            }
            
//                self.HiRes.setNeedsDisplay(self.HiRes.frame)
//            self.hires.setNeedsDisplay( CGRect(x: 0, y: 191-50, width: 50, height: 50) )
            self.hires.needsDisplay = true
//            }
            #endif
        }
    }

    
//    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/Double(fps))
    
    override var prefersStatusBarHidden: Bool {
        return true
    }
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let spk_up_path = Bundle.main.path(forResource: "spk_up", ofType:"wav")!
        let spk_up_url = URL(fileURLWithPath: spk_up_path)
        do {
            spk_up = try AVAudioPlayer(contentsOf: spk_up_url)
//            spk_up?.play()
        } catch {
            // couldn't load file :(
        }
        
        let spk_dn_path = Bundle.main.path(forResource: "spk_dn", ofType:"wav")!
        let spk_dn_url = URL(fileURLWithPath: spk_dn_path)
        do {
            spk_dn = try AVAudioPlayer(contentsOf: spk_dn_url)
//            spk_up?.play()
        } catch {
            // couldn't load file :(
        }



        
        //view.frame = CGRect(origin: CGPoint(), size: NSScreen.main!.visibleFrame.size)
                
//        createHiRes()
        
//        self.displayField.scaleUnitSquare(to: NSSize(width: 1, height: 1))
        
//        NSEvent.removeMonitor(NSEvent.EventType.flagsChanged)
//        NSEvent.addLocalMonitorForEvents(matching: .flagsChanged) {
//            self.flagsChanged(with: $0)
//            return $0
//        }

//        //        NSEvent.removeMonitor(NSEvent.EventType.keyDown)
//        NSEvent.addLocalMonitorForEvents(matching: .keyDown) {
////            print("keyDown event")
//            self.keyDown(with: $0)
//            return $0
//        }
        
        displayField.textContainer.maximumNumberOfLines = textLines
//        displayField.preferredMaxLayoutWidth = displayField.frame.width

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

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


    
    func setCPUClockSpeed( freq : Double ) {
        mhz = freq
        MHz_6502 = UInt64(mhz * M)
        clk_6502_per_frm = MHz_6502 / UInt64(fps)
        clk_6502_per_frm_set = clk_6502_per_frm
    }

    @IBAction func speedSelected(_ sender: UIButton) {
        if ( sender.titleLabel?.text == "Max" ) {
            clk_6502_per_frm = UINT64_MAX
        }
        else if let freqValue = sender.titleLabel?.text, let freq = Double( freqValue ) {
            setCPUClockSpeed(freq: freq)
        }
    }
    
    @IBAction func diskAccelSepected(_ sender: UIButton) {
        if let freqValue = sender.titleLabel?.text, let freq = Int32( freqValue ) {
            diskAccelerator_speed = freq
            diskAccel.text = "Disk Accel: " + freqValue
        }
    }
    
}