package net.torvald.terrarum.virtualcomputer.terminal

import net.torvald.aa.AAFrame
import net.torvald.terrarum.*
import net.torvald.terrarum.gameactors.DecodeTapestry
import net.torvald.terrarum.gameactors.abs
import net.torvald.terrarum.gamecontroller.Key
import net.torvald.terrarum.virtualcomputer.computer.TerrarumComputer
import org.lwjgl.BufferUtils
import org.lwjgl.openal.AL
import org.lwjgl.openal.AL10
import org.lwjgl.openal.AL11
import org.newdawn.slick.*
import java.nio.ByteBuffer
import java.util.*

/**
 * Default text terminal.
 *
 * Created by minjaesong on 16-09-07.
 */
open class SimpleTextTerminal(
        phosphorColour: Color, override val width: Int, override val height: Int, private val host: TerrarumComputer,
        colour: Boolean = false, hires: Boolean = false
) : Terminal {

    private val DEBUG = false

    /**
     * Terminals must support AT LEAST 4 colours.
     * Color index 0 must be default background, index 3 must be default foreground
     */
    open protected val colours = if (colour) CLUT else CLUT.copyOfRange(0, 4)

    val phosphor = if (colour) WHITE7500 else phosphorColour
    open val colourScreen = if (colour) Color(8, 8, 8) else Color(19, 19, 19)

    override val coloursCount: Int
        get() = colours.size

    val errorColour = if (coloursCount > 4) 6 else 1

    open val backDefault = 0 // STANDARD
    open val foreDefault = 3 // STANDARD

    override var backColour = backDefault
    override var foreColour = foreDefault
    private val colourKey: Int
        get() = backColour.shl(4) or (foreColour).and(0xFF)

    override var cursorX = 0
    override var cursorY = 0
    override var cursorBlink = true

    val screenBuffer = AAFrame(width, height, this)

    open protected val fontRef =
            "./assets/graphics/fonts/${
                if (hires) "milky.tga"
                else if (phosphor == GREEN || phosphor == AMBER) "MDA.tga"
                else "milkymda.tga"
            }"
    open protected val fontImg = Image(fontRef)
    open val fontW = fontImg.width / 16
    open val fontH = fontImg.height / 16
    open protected val font = SpriteSheetFont(SpriteSheet(fontRef, fontW, fontH), 0.toChar())

    val borderSize = 20
    override val displayW = fontW * width + 2 * borderSize
    override val displayH = fontH * height + 2 * borderSize


    var TABSIZE = 4

    private var cursorBlinkTimer = 0
    private val cursorBlinkLen = 250
    var cursorBlinkOn = true
        private set



    override fun getColor(index: Int): Color = colours[index]

    override fun update(gc: GameContainer, delta: Int) {
        cursorBlinkTimer = cursorBlinkTimer.plus(delta)
        if (cursorBlinkTimer > cursorBlinkLen) {
            cursorBlinkTimer -= cursorBlinkLen
            cursorBlinkOn = !cursorBlinkOn
        }

        wrap()
    }

    private fun wrap() {
        // wrap cursor
        if (cursorX < 0 && cursorY <= 0) {
            setCursor(0, 0)
        }
        else if (cursorX >= width) {
            setCursor(0, cursorY + 1)
        }
        else if (cursorX < 0) {
            setCursor(width - 1, cursorY - 1)
        }
        // auto scroll up
        if (cursorY >= height) {
            scroll()
        }
    }

    /**
     * pass UIcanvas to the parameter "g"
     */
    override fun render(gc: GameContainer, g: Graphics) {
        g.font = font


        blendNormal()

        // black background (this is mandatory)
        g.color = Color.black
        g.fillRect(0f, 0f, displayW.toFloat(), displayH.toFloat())


        // screen buffer
        for (y in 0..height - 1) {
            for (x in 0..width - 1) {
                val ch = screenBuffer.getChar(x, y)

                // background
                g.color = getColor(screenBuffer.getBackgroundColour(x, y))
                g.fillRect(fontW * x.toFloat() + borderSize, fontH * y.toFloat() + borderSize,
                        fontW.toFloat(), fontH.toFloat())

                // foreground
                if (ch.toInt() != 0 && ch.toInt() != 32) {
                    g.color = getColor(screenBuffer.getForegroundColour(x, y))
                    g.drawString(
                            Character.toString(ch),
                            fontW * x.toFloat() + borderSize, fontH * y.toFloat() + borderSize)
                }
            }
        }


        // cursor
        if (cursorBlinkOn) {
            g.color = getColor(if (cursorBlink) foreDefault else backDefault)

            g.fillRect(
                    fontW * cursorX.toFloat() + borderSize,
                    fontH * cursorY.toFloat() + borderSize,
                    fontW.toFloat(),
                    fontH.toFloat()
            )
        }

        // colour base
        g.color = colourScreen
        blendScreen()
        g.fillRect(0f, 0f, fontW * width.toFloat() + 2 * borderSize, fontH * height.toFloat() + 2 * borderSize)

        // colour overlay
        g.color = phosphor
        blendMul()
        g.fillRect(0f, 0f, fontW * width.toFloat() + 2 * borderSize, fontH * height.toFloat() + 2 * borderSize)



        blendNormal()

    }

    /** Unlike lua function, this one in Zero-based. */
    override fun setCursor(x: Int, y: Int) {
        cursorX = x
        cursorY = y
    }

    /** Emits a bufferChar. Does not move cursor
     *  It is also not affected by the control sequences; just print them out as symbol */
    override fun emitChar(bufferChar: Int, x: Int, y: Int) {
        try { screenBuffer.drawBuffer(x, y, bufferChar.toChar()) }
        catch (e: ArrayIndexOutOfBoundsException) { e.printStackTrace() }
    }

    /** Emits a char. Does not move cursor
     *  It is also not affected by the control sequences; just print them out as symbol */
    override fun emitChar(c: Char, x: Int, y: Int) {
        try { screenBuffer.drawBuffer(x, y, c.toInt().and(0xFF).toChar(), colourKey) }
        catch (e: ArrayIndexOutOfBoundsException) { e.printStackTrace() }
    }

    /** Prints a char and move cursor accordingly. */
    override fun printChar(c: Char) {
        wrap()
        if (c >= ' ' && c.toInt() != 127) {
            emitChar(c, cursorX, cursorY)
            cursorX += 1
        }
        else {
            when (c) {
                ASCII_BEL -> bell(".")
                ASCII_BS  -> { cursorX -= 1; wrap() }
                ASCII_TAB -> { cursorX = (cursorX).div(TABSIZE).times(TABSIZE) + TABSIZE }
                ASCII_LF  -> newLine()
                ASCII_FF  -> clear()
                ASCII_CR  -> { cursorX = 0 }
                ASCII_DEL -> { cursorX -= 1; wrap(); emitChar(colourKey.shl(8), cursorX, cursorY) }
                ASCII_DC1, ASCII_DC2, ASCII_DC3, ASCII_DC4 -> { foreColour = c - ASCII_DC1 }
                ASCII_DLE -> { foreColour = errorColour }
            }
        }
    }

    /** (TTY): Prints a series of chars and move cursor accordingly, then LF
     * (term): printString() on current cursor pos */
    override fun printChars(s: String) {
        printString(s, cursorX, cursorY)
    }

    /** (TTY): Prints a series of chars and move cursor accordingly
     * (term): writeString() on current cursor pos */
    override fun writeChars(s: String) {
        writeString(s, cursorX, cursorY)
    }

    /** Emits a string and move cursor accordingly, then do LF */
    override fun printString(s: String, x: Int, y: Int) {
        writeString(s, x, y)
        newLine()
    }

    /** Emits a string and move cursor accordingly. */
    override fun writeString(s: String, x: Int, y: Int) {
        setCursor(x, y)

        for (i in 0..s.length - 1) {
            printChar(s[i])
            wrap()
        }
    }

    /** Emits a string, does not affected by control sequences. Does not move cursor */
    override fun emitString(s: String, x: Int, y: Int) {
        setCursor(x, y)

        for (i in 0..s.length - 1) {
            printChar(s[i])
            wrap()
        }

        setCursor(x, y)
    }

    override fun clear() {
        screenBuffer.clear(backColour)
        cursorX = 0
        cursorY = 0
    }

    override fun clearLine() {
        for (i in 0..width - 1)
            screenBuffer.drawBuffer(i, cursorY, 0.toChar(), colourKey)
    }

    override fun newLine() {
        cursorX = 0; cursorY += 1; wrap()
    }

    override fun scroll(amount: Int) {
        val offset = amount.times(width).abs()
        val bsize = screenBuffer.sizeof.ushr(1)

        if (amount == 0) return

        if (amount > 0) {
            for (i in 0..bsize - 1) {
                if (i < Math.min(bsize, bsize - offset - 1))
                    // displace contents in buffer
                    screenBuffer.frameBuffer[i] = screenBuffer.frameBuffer[i + offset]
                else
                    // clean up garbages
                    screenBuffer.frameBuffer[i] = 0.toChar()
            }
            cursorY -= amount
        }
        else {
            for (i in bsize - 1 downTo 0) {
                if (i > Math.max(offset - 1, 0))
                    // displace contents in buffer
                    screenBuffer.frameBuffer[i] = screenBuffer.frameBuffer[i - offset]
                else
                    screenBuffer.frameBuffer[i] = 0.toChar()
            }
            cursorY += amount
        }
    }

    override fun setColour(back: Int, fore: Int) {
        backColour = back
        foreColour = fore
    }

    override fun resetColour() {
        backColour = backDefault
        foreColour = foreDefault
    }

    /**
     * @param duration: milliseconds
     * @param freg: Frequency (float)
     */
    override fun emitTone(duration: Int, freq: Double) {
        // println("!! Beep playing row $beepCursor, d ${Math.min(duration, maxDuration)} f $freq")
        host.clearBeepQueue()
        host.enqueueBeep(duration, freq)
    }

    /** for "emitTone code" on modern BIOS. */
    override fun bell(pattern: String) {
        host.clearBeepQueue()

        val freq: Double =
                if (host.luaJ_globals["computer"]["bellpitch"].isnil())
                    1000.0
                else
                    host.luaJ_globals["computer"]["bellpitch"].checkdouble()

        for (c in pattern) {
            when (c) {
                '.' -> { host.enqueueBeep(80, freq);  host.enqueueBeep(50, 0.0) }
                '-' -> { host.enqueueBeep(200, freq); host.enqueueBeep(50, 0.0) }
                '=' -> { host.enqueueBeep(500, freq); host.enqueueBeep(50, 0.0) }
                ' ' -> { host.enqueueBeep(200, 0.0) }
                ',' -> { host.enqueueBeep(50, 0.0) }
                else -> throw IllegalArgumentException("Unacceptable pattern: $c (from '$pattern')")
            }
        }
    }

    override fun keyPressed(key: Int, c: Char) {
        host.keyPressed(key, c)
    }

    private fun isOOB(x: Int, y: Int) =
            (x < 0 || y < 0 || x >= width || y >= height)

    companion object {
        val AMBER = Color(255, 183, 0) // P3, 602 nm
        val GREEN = Color(74, 255, 0) // P39, 525 nm
        val WHITE = Color(204, 223, 255) // approximation of white CRT I own
        private val WHITE7500 = Color(0xe4eaff)
        val BLUE_NOVELTY = Color(0x27d7ff)
        val RED = Color(250, 51, 0) // 632 nm
        val AMETHYST_NOVELTY = Color(0xc095ff)

        val ASCII_NUL = 0.toChar()
        val ASCII_BEL = 7.toChar()   // *BEEP!*
        val ASCII_BS = 8.toChar()    // x = x - 1
        val ASCII_TAB = 9.toChar()   // move cursor to next (TABSIZE * yy) pos (5 -> 8, 3- > 4, 4 -> 8)
        val ASCII_LF = 10.toChar()   // new line
        val ASCII_FF = 12.toChar()   // new page
        val ASCII_CR = 13.toChar()   // x <- 0
        val ASCII_DEL = 127.toChar() // backspace and delete char
        val ASCII_DC1 = 17.toChar()  // foreground colour 0
        val ASCII_DC2 = 18.toChar()  // foreground colour 1
        val ASCII_DC3 = 19.toChar()  // foreground colour 2
        val ASCII_DC4 = 20.toChar()  // foreground colour 3
        val ASCII_DLE = 16.toChar()  // error message colour

        val asciiControlInUse = charArrayOf(
                ASCII_NUL,
                ASCII_BEL,
                ASCII_BS,
                ASCII_TAB,
                ASCII_LF,
                ASCII_FF,
                ASCII_CR,
                ASCII_DEL,
                ASCII_DC1,
                ASCII_DC2,
                ASCII_DC3,
                ASCII_DC4,
                ASCII_DLE
        )

        val CLUT = DecodeTapestry.colourIndices16
    }
}

class ALException(errorCode: Int) : Exception("ALerror: $errorCode") {

}