const COL_TEXT = 239
const COL_BACK = 255
const COL_SUPERTEXT = 239
const COL_DIMTEXT = 249
const COL_LNUMBACK = 18
const COL_LNUMFORE = 253
const COL_CARET_ROW = 81
const BIG_STRIDE = 999
const TAB_SIZE = 4
const PAINT_START_Y = 3
const MEM = system.maxmem()

const NO_LINEHEAD_PUNCT = [33,34,39,41,44,46,58,59,62,63,93,125]
const NO_LINELAST_PUNCT = [34,39,40,60,91,123]

const TYPESET_DEBUG_PRINT = true

let PAGE_HEIGHT = 60
let PAGE_WIDTH = 80
// 80x60  -> 720x1080 text area; with 72px margin for each side, paper resolution is 864x1224, which is quite close to 1:sqrt(2) ratio

let scroll = 0
let scrollHor = 0
let paragraphs = [
'Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry\'s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.',
'Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of "de Finibus Bonorum et Malorum" (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, "Lorem ipsum dolor sit amet..", comes from a line in section 1.10.32.',
'The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested. Sections 1.10.32 and 1.10.33 from "de Finibus Bonorum et Malorum" by Cicero are also reproduced in their exact original form, accompanied by English versions from the 1914 translation by H. Rackham.'
]
let typesetIndices = []
let cursorRow = 0
let cursorCol = 0
let page = 0
let exit = false
let bulletinShown = false
let cursoringCol = 0

let filename = "NEWFILE"
let modified = false
let editorMode = 1 // 0: Visual Mode, 1: Edit Mode, 2: Command Mode; just like the good ol' Vi
const editorModeLabel = ["VISUAL MODE (hit I to EDIT, hit : to enter a COMMAND)", "EDIT MODE (hit ESC for Visual Mode)", ":"]
let cmdbuf = ""

let windowWidth = 0
let windowHeight = 0
let paintWidth = 0
let paintHeight = 0
let scrollPeek = 0
let PAINT_START_X = 0
let caretLeft = 0
let caretRight = 0
const scrollHorPeek = 1; // to accommodate the scroll indicator
function drawInit() {
    // wipe screen
    for (let i = 0; i < 80*32; i++) {
        sys.poke(-1302529 - i, COL_TEXT)
        sys.poke(-1305089 - i, COL_BACK)
        sys.poke(-1307649 - i, 0)
    }

    // set variables
    windowWidth = con.getmaxyx()[1]
    windowHeight = con.getmaxyx()[0]
    caretLeft = (windowWidth - PAGE_WIDTH) >> 1
    caretRight = caretLeft + PAGE_WIDTH

    PAINT_START_X = caretLeft + 1

    paintWidth = caretRight - caretLeft
    paintHeight = windowHeight - PAINT_START_Y

    scrollPeek = Math.ceil((paintHeight / 7))

}

function ctrlToSym(c) {
    if (c == 10) return 254
    if (c == 32) return 250
    return c
}

function drawMenubar() {
    let icon = (modified) ? '*' : '-'
    let fnamestr = `${icon} ${filename} ${icon}`
    con.move(1,(windowWidth - fnamestr.length) / 2)
    print(fnamestr)
}

function drawPRC() {
    con.move(1,2)
    print(`PG:${page+1} LN:${cursorRow+1} COL:${cursorCol+1}     `)


    let rb = MEM - paragraphs.map(it => it.length).reduce((acc,i) => acc + i)
    let rp = (rb/100)|0
    let s = `   REMAIN:${(rp/10)|0}.${rp%10}K`
    con.move(1,windowWidth - s.length)
    print(s)
}

function typesetAndPrint(from, toExclusive) {
    let lineStart = from || scroll
    let lineEnd = toExclusive || scroll + paintHeight

    let printbuf = []
    typesetIndices = [lineStart]
    for (let i = 0; i < paintHeight; i++) { printbuf.push('') }
    let vr = 0; let vc = 0 // virtual row/column
    let text = paragraphs.slice(lineStart, lineEnd).join('\n')

    function ln(i) {
        vr += 1;vc = 0
        typesetIndices.push(i)
    }

    for (let i = 0; i < text.length; i++) {
        let cM2 = text.charCodeAt(i-2)
        let cM1 = text.charCodeAt(i-1)
        let c = text.charCodeAt(i)
        let c1 = text.charCodeAt(i+1)
        let c2 = text.charCodeAt(i+2)

        //serial.println(`i:${i} char:'${String.fromCharCode(cM2,cM1,32,c,32,c1,c2)}' Ln ${vr} Col ${vc}`)

        if (c == 10) {
            printbuf[vr] += String.fromCharCode(254)
            ln(i+1)
            printbuf[vr] = ''
        }
        else if (vc == paintWidth - 1 && NO_LINEHEAD_PUNCT.includes(c1)) {
            printbuf[vr] += String.fromCharCode(c, c1)
            ln(i)
            i += (32 == c2) ? 2 : 1
            typesetIndices[typesetIndices.length - 1] = i+1
        }
        else if (vc == paintWidth - 1 && NO_LINELAST_PUNCT.includes(c)) {
            ln(i)
            printbuf[vr] += String.fromCharCode(c)
        }
        else if (vc == paintWidth - 1) {
            if (32 == c || 32 == c1 || 10 == c1) {
                printbuf[vr] += String.fromCharCode(ctrlToSym(c))
                if (32 == c1 || 10 == c1) printbuf[vr] += String.fromCharCode(ctrlToSym(c1))
                ln(i+1)
                if (32 == c1 || 10 == c1) {
                    i += 1
                    typesetIndices[typesetIndices.length - 1] += 1
                }
            }
            // if the head-char of the word happens to sit on the rightmost side and the char right before is ' '
            else if (32 == cM2) {
                printbuf[vr] = printbuf[vr].substring(0, printbuf[vr].length - 1)
                ln(i-1); vc = 1
                printbuf[vr] += String.fromCharCode(cM1, c)
            }
            else {
                printbuf[vr] += (45 == cM1 || 32 == cM1) ? ' ' : '-'
                ln(i)
                printbuf[vr] += String.fromCharCode(c)
                vc += 1
            }
        }
        else if (c >= 32 && c <= 175 || c >= 224 && c <= 253) {
            printbuf[vr] += String.fromCharCode(ctrlToSym(c))
            vc += 1
        }

        //if (vr > paintHeight || c === undefined) break;
    }

    for (let y = 0; y < paintHeight; y++) {
        //con.move(3+y, 1+caretLeft)
        //print(printbuf[y] || '')
        let str = printbuf[y] || ''
        for (let x = 0; x < str.length; x++) {
            sys.poke(
                -1307649 - ((y+2) * windowWidth + caretLeft) - x,
                str.charCodeAt(x)
            )
        }
    }

    if (TYPESET_DEBUG_PRINT) {
        for (let y = 0; y < paintHeight; y++) {
            con.move(3+y, 1)
            print(typesetIndices[y]+1 || '-')
        }
    }

    gotoText()
}

function gotoText() {
    con.move(PAINT_START_Y + cursorRow - scroll, PAINT_START_X + cursorCol - scrollHor)
    con.curs_set(1)
}

function drawColumnInd() {
    for (let k = 0; k < windowWidth; k++) {
        let off = k - caretLeft + 1
        let char = 0xBC
        if (off % 10 == 0) char = 0xB0 + (off/10|0)
        if (off == 1) char = 0xB0
        if (k == caretRight - 1) char = 0xBA
        if (off % 10 == 5) char = 0xBB
        if (off <= 0 || off > paintWidth) char = 0xBC
        if (off - 1 == cursorCol) char += 16

        con.mvaddch(2, PAINT_START_X + off - 1, char)
    }
}

function drawCmdbuf() {
    con.move(windowHeight, 2)
    for (let i = 2; i <= windowWidth - 1; i++) {
        print(' ')
    }
    con.move(windowHeight, 2)
    print(editorModeLabel[editorMode])

    if (2 == editorMode) print(cmdbuf)
}

function drawMain() {
    con.curs_set(0)
    drawInit()
    con.color_pair(COL_TEXT, COL_BACK)

    drawMenubar()
    drawPRC()
    drawColumnInd()
    drawCmdbuf()

}


drawMain()
typesetAndPrint()