#!/usr/bin/env python3
"""\
Usages:
    epr             read last epub
    epr EPUBFILE    read EPUBFILE
    epr STRINGS     read matched STRINGS from history
    epr NUMBER      read file from history
                    with associated NUMBER

Options:
    -r              print reading history
    -d              dump epub
    -h, --help      print short, long help

Key Binding:
    Help            : ?
    Quit            : q
    Scroll down     : DOWN      j
    Scroll up       : UP        k
    Half screen up  : C-u
    Half screen dn  " C-d
    Page down       : PGDN      RIGHT   SPC
    Page up         : PGUP      LEFT
    Next chapter    : n
    Prev chapter    : p
    Beginning of ch : HOME      g
    End of ch       : END       G
    Open image      : o
    Search          : /
    Next Occurence  : n
    Prev Occurence  : N
    Toggle width    : =
    Set width       : [count]=
    Shrink          : -
    Enlarge         : +
    ToC             : TAB       t
    Metadata        : m
    Mark pos to n   : b[n]
    Jump to pos n   : `[n]
    Switch colorsch : [default=0, dark=1, light=2]c
"""


__version__ = "2.4.8"
__license__ = "MIT"
__author__ = "Benawi Adha"
__url__ = "https://github.com/wustho/epr"


import curses
import zipfile
import sys
import re
import os
import textwrap
import json
import tempfile
import shutil
import subprocess
import xml.etree.ElementTree as ET
from urllib.parse import unquote
from html import unescape
from html.parser import HTMLParser
from difflib import SequenceMatcher as SM


# key bindings
SCROLL_DOWN = {curses.KEY_DOWN, ord("j")}
SCROLL_UP = {curses.KEY_UP, ord("k")}
HALF_DOWN = {4}
HALF_UP = {21}
PAGE_DOWN = {curses.KEY_NPAGE, ord("l"), ord(" "), curses.KEY_RIGHT}
PAGE_UP = {curses.KEY_PPAGE, ord("h"), curses.KEY_LEFT}
CH_NEXT = {ord("n")}
CH_PREV = {ord("p")}
CH_HOME = {curses.KEY_HOME, ord("g")}
CH_END = {curses.KEY_END, ord("G")}
SHRINK = ord("-")
WIDEN = ord("+")
WIDTH = ord("=")
META = {ord("m")}
TOC = {9, ord("\t"), ord("t")}
FOLLOW = {10}
QUIT = {ord("q"), 3, 27, 304}
HELP = {ord("?")}
MARKPOS = ord("b")
JUMPTOPOS = ord("`")
COLORSWITCH = ord("c")


# colorscheme
# DARK/LIGHT = (fg, bg)
# -1 is default terminal fg/bg
DARK = (252, 235)
LIGHT = (239, 223)


# some global envs, better leave these alone
STATEFILE = ""
STATE = {}
LINEPRSRV = 0  # default = 2
COLORSUPPORT = False
SEARCHPATTERN = None
VWR = None
JUMPLIST = {}


class Epub:
    NS = {
        "DAISY": "http://www.daisy.org/z3986/2005/ncx/",
        "OPF": "http://www.idpf.org/2007/opf",
        "CONT": "urn:oasis:names:tc:opendocument:xmlns:container",
        "XHTML": "http://www.w3.org/1999/xhtml",
        "EPUB": "http://www.idpf.org/2007/ops"
    }

    def __init__(self, fileepub):
        self.path = os.path.abspath(fileepub)
        self.file = zipfile.ZipFile(fileepub, "r")
        cont = ET.parse(self.file.open("META-INF/container.xml"))
        self.rootfile = cont.find(
            "CONT:rootfiles/CONT:rootfile",
            self.NS
        ).attrib["full-path"]
        self.rootdir = os.path.dirname(self.rootfile)\
            + "/" if os.path.dirname(self.rootfile) != "" else ""
        cont = ET.parse(self.file.open(self.rootfile))
        # EPUB3
        self.version = cont.getroot().get("version")
        if self.version == "2.0":
            # self.toc = self.rootdir + cont.find("OPF:manifest/*[@id='ncx']", self.NS).get("href")
            self.toc = self.rootdir\
                + cont.find(
                    "OPF:manifest/*[@media-type='application/x-dtbncx+xml']",
                    self.NS
                ).get("href")
        elif self.version == "3.0":
            self.toc = self.rootdir\
                + cont.find(
                    "OPF:manifest/*[@properties='nav']",
                    self.NS
                ).get("href")

        self.contents = []
        self.toc_entries = []

    def get_meta(self):
        meta = []
        # why self.file.read(self.rootfile) problematic
        cont = ET.fromstring(self.file.open(self.rootfile).read())
        for i in cont.findall("OPF:metadata/*", self.NS):
            if i.text is not None:
                meta.append([re.sub("{.*?}", "", i.tag), i.text])
        return meta

    def initialize(self):
        cont = ET.parse(self.file.open(self.rootfile)).getroot()
        manifest = []
        for i in cont.findall("OPF:manifest/*", self.NS):
            # EPUB3
            # if i.get("id") != "ncx" and i.get("properties") != "nav":
            if i.get("media-type") != "application/x-dtbncx+xml"\
               and i.get("properties") != "nav":
                manifest.append([
                    i.get("id"),
                    i.get("href")
                ])

        spine, contents = [], []
        for i in cont.findall("OPF:spine/*", self.NS):
            spine.append(i.get("idref"))
        for i in spine:
            for j in manifest:
                if i == j[0]:
                    self.contents.append(self.rootdir+unquote(j[1]))
                    contents.append(unquote(j[1]))
                    manifest.remove(j)
                    # TODO: test is break necessary
                    break

        toc = ET.parse(self.file.open(self.toc)).getroot()
        # EPUB3
        if self.version == "2.0":
            navPoints = toc.findall("DAISY:navMap//DAISY:navPoint", self.NS)
        elif self.version == "3.0":
            navPoints = toc.findall(
                "XHTML:body//XHTML:nav[@EPUB:type='toc']//XHTML:a",
                self.NS
            )
        for i in contents:
            name = "-"
            for j in navPoints:
                # EPUB3
                if self.version == "2.0":
                    # if i == unquote(j.find("DAISY:content", self.NS).get("src")):
                    if re.search(i, unquote(j.find("DAISY:content", self.NS).get("src"))) is not None:
                        name = j.find("DAISY:navLabel/DAISY:text", self.NS).text
                        break
                elif self.version == "3.0":
                    # if i == unquote(j.get("href")):
                    if re.search(i, unquote(j.get("href"))) is not None:
                        name = "".join(list(j.itertext()))
                        break
            self.toc_entries.append(name)


class HTMLtoLines(HTMLParser):
    para = {"p", "div"}
    inde = {"q", "dt", "dd", "blockquote"}
    pref = {"pre"}
    bull = {"li"}
    hide = {"script", "style", "head"}
    # hide = {"script", "style", "head", ", "sub}

    def __init__(self):
        HTMLParser.__init__(self)
        self.text = [""]
        self.imgs = []
        self.ishead = False
        self.isinde = False
        self.isbull = False
        self.ispref = False
        self.ishidden = False
        self.idhead = set()
        self.idinde = set()
        self.idbull = set()
        self.idpref = set()

    def handle_starttag(self, tag, attrs):
        if re.match("h[1-6]", tag) is not None:
            self.ishead = True
        elif tag in self.inde:
            self.isinde = True
        elif tag in self.pref:
            self.ispref = True
        elif tag in self.bull:
            self.isbull = True
        elif tag in self.hide:
            self.ishidden = True
        elif tag == "sup":
            self.text[-1] += "^{"
        elif tag == "sub":
            self.text[-1] += "_{"
        elif tag == "image":
            for i in attrs:
                if i[0] == "xlink:href":
                    self.text.append("[IMG:{}]".format(len(self.imgs)))
                    self.imgs.append(unquote(i[1]))

    def handle_startendtag(self, tag, attrs):
        if tag == "br":
            self.text += [""]
        elif tag in {"img", "image"}:
            for i in attrs:
                if (tag == "img" and i[0] == "src") or (tag == "image" and i[0] == "xlink:href"):
                    self.text.append("[IMG:{}]".format(len(self.imgs)))
                    self.imgs.append(unquote(i[1]))
                    self.text.append("")

    def handle_endtag(self, tag):
        if re.match("h[1-6]", tag) is not None:
            self.text.append("")
            self.text.append("")
            self.ishead = False
        elif tag in self.para:
            self.text.append("")
        elif tag in self.hide:
            self.ishidden = False
        elif tag in self.inde:
            if self.text[-1] != "":
                self.text.append("")
            self.isinde = False
        elif tag in self.pref:
            if self.text[-1] != "":
                self.text.append("")
            self.ispref = False
        elif tag in self.bull:
            if self.text[-1] != "":
                self.text.append("")
            self.isbull = False
        elif tag in {"sub", "sup"}:
            self.text[-1] += "}"
        elif tag == "image":
            self.text.append("")

    def handle_data(self, raw):
        if raw and not self.ishidden:
            if self.text[-1] == "":
                tmp = raw.lstrip()
            else:
                tmp = raw
            if self.ispref:
                line = unescape(tmp)
            else:
                line = unescape(re.sub(r"\s+", " ", tmp))
            self.text[-1] += line
            if self.ishead:
                self.idhead.add(len(self.text)-1)
            elif self.isbull:
                self.idbull.add(len(self.text)-1)
            elif self.isinde:
                self.idinde.add(len(self.text)-1)
            elif self.ispref:
                self.idpref.add(len(self.text)-1)

    def get_lines(self, width=0):
        text = []
        if width == 0:
            return self.text
        for n, i in enumerate(self.text):
            if n in self.idhead:
                text += [i.rjust(width//2 + len(i)//2)] + [""]
            elif n in self.idinde:
                text += ["   "+j for j in textwrap.wrap(i, width - 3)] + [""]
            elif n in self.idbull:
                tmp = textwrap.wrap(i, width - 3)
                text += [" - "+j if j == tmp[0] else "   "+j for j in tmp] + [""]
            elif n in self.idpref:
                tmp = i.splitlines()
                wraptmp = []
                for line in tmp:
                    wraptmp += [j for j in textwrap.wrap(line, width - 6)]
                text += ["   "+j for j in wraptmp] + [""]
            else:
                text += textwrap.wrap(i, width) + [""]
        return text, self.imgs


def loadstate():
    global STATE, STATEFILE
    if os.getenv("HOME") is not None:
        STATEFILE = os.path.join(os.getenv("HOME"), ".epr")
        if os.path.isdir(os.path.join(os.getenv("HOME"), ".config")):
            configdir = os.path.join(os.getenv("HOME"), ".config", "epr")
            os.makedirs(configdir, exist_ok=True)
            if os.path.isfile(STATEFILE):
                if os.path.isfile(os.path.join(configdir, "config")):
                    os.remove(os.path.join(configdir, "config"))
                shutil.move(STATEFILE, os.path.join(configdir, "config"))
            STATEFILE = os.path.join(configdir, "config")
    elif os.getenv("USERPROFILE") is not None:
        STATEFILE = os.path.join(os.getenv("USERPROFILE"), ".epr")
    else:
        STATEFILE = os.devnull

    if os.path.exists(STATEFILE):
        with open(STATEFILE, "r") as f:
            STATE = json.load(f)


def savestate(file, index, width, pos, pctg ):
    for i in STATE:
        STATE[i]["lastread"] = str(0)
    STATE[file]["lastread"] = str(1)
    STATE[file]["index"] = str(index)
    STATE[file]["width"] = str(width)
    STATE[file]["pos"] = str(pos)
    STATE[file]["pctg"] = str(pctg)
    with open(STATEFILE, "w") as f:
        json.dump(STATE, f, indent=4)


def pgup(pos, winhi, preservedline=0, c=1):
    if pos >= (winhi - preservedline) * c:
        return pos - (winhi - preservedline) * c
    else:
        return 0


def pgdn(pos, tot, winhi, preservedline=0,c=1):
    if pos + (winhi * c) <= tot - winhi:
        return pos + (winhi * c)
    else:
        pos = tot - winhi
        if pos < 0:
            return 0
        return pos


def pgend(tot, winhi):
    if tot - winhi >= 0:
        return tot - winhi
    else:
        return 0


def toc(stdscr, src, index):
    rows, cols = stdscr.getmaxyx()
    hi, wi = rows - 4, cols - 4
    Y, X = 2, 2
    oldindex = index
    toc = curses.newwin(hi, wi, Y, X)
    if COLORSUPPORT:
        toc.bkgd(stdscr.getbkgd())

    toc.box()
    toc.keypad(True)
    toc.addstr(1,2, "Table of Contents")
    toc.addstr(2,2, "-----------------")
    key_toc = 0

    totlines = len(src)
    toc.refresh()
    pad = curses.newpad(totlines, wi - 2 )
    if COLORSUPPORT:
        pad.bkgd(stdscr.getbkgd())

    pad.keypad(True)

    padhi = rows - 5 - Y - 4 + 1
    y = 0
    if index in range(padhi//2, totlines - padhi//2):
        y = index - padhi//2 + 1
    d = len(str(totlines))
    span = []

    for n, i in enumerate(src):
        # strs = "  " + str(n+1).rjust(d) + " " + i[0]
        strs = "  " + i
        strs = strs[0:wi-3]
        pad.addstr(n, 0, strs)
        span.append(len(strs))

    countstring = ""
    while key_toc not in TOC|QUIT:
        if countstring == "":
            count = 1
        else:
            count = int(countstring)
        if key_toc in range(48, 58): # i.e., k is a numeral
            countstring = countstring + chr(key_toc)
        else:
            if key_toc in SCROLL_UP or key_toc in PAGE_UP:
                index -= count
                if index < 0:
                    index = 0
            elif key_toc in SCROLL_DOWN or key_toc in PAGE_DOWN:
                index += count
                if index + 1 >= totlines:
                    index = totlines - 1
            elif key_toc in FOLLOW:
                # if index == oldindex:
                #     break
                return index
            # elif key_toc in PAGE_UP:
            #     index -= 3
            #     if index < 0:
            #         index = 0
            # elif key_toc in PAGE_DOWN:
            #     index += 3
            #     if index >= totlines:
            #         index = totlines - 1
            elif key_toc in CH_HOME:
                index = 0
            elif key_toc in CH_END:
                index = totlines - 1
            elif key_toc in {curses.KEY_RESIZE}|HELP|META:
                return key_toc
            countstring = ""

        while index not in range(y, y+padhi):
            if index < y:
                y -= 1
            else:
                y += 1

        for n in range(totlines):
            att = curses.A_REVERSE if index == n else curses.A_NORMAL
            pre = ">>" if index == n else "  "
            pad.addstr(n, 0, pre)
            pad.chgat(n, 0, span[n], pad.getbkgd() | att)

        pad.refresh(y, 0, Y+4,X+4, rows - 5, cols - 6)
        key_toc = toc.getch()

    toc.clear()
    toc.refresh()
    return


def meta(stdscr, ebook):
    rows, cols = stdscr.getmaxyx()
    hi, wi = rows - 4, cols - 4
    Y, X = 2, 2
    meta = curses.newwin(hi, wi, Y, X)
    if COLORSUPPORT:
        meta.bkgd(stdscr.getbkgd())

    meta.box()
    meta.keypad(True)
    meta.addstr(1,2, "Metadata")
    meta.addstr(2,2, "--------")
    key_meta = 0

    mdata = []
    for i in ebook.get_meta():
        data = re.sub("<[^>]*>", "", i[1])
        data = re.sub("\t", "", data)
        mdata += textwrap.wrap(i[0].upper() + ": " + data, wi - 6)
    src_lines = mdata
    totlines = len(src_lines)

    pad = curses.newpad(totlines, wi - 2 )
    if COLORSUPPORT:
        pad.bkgd(stdscr.getbkgd())

    pad.keypad(True)
    for n, i in enumerate(src_lines):
        pad.addstr(n, 0, i)
    y = 0
    meta.refresh()
    pad.refresh(y,0, Y+4,X+4, rows - 5, cols - 6)

    padhi = rows - 5 - Y - 4 + 1

    while key_meta not in META|QUIT:
        if key_meta in SCROLL_UP and y > 0:
            y -= 1
        elif key_meta in SCROLL_DOWN and y < totlines - hi + 6:
            y += 1
        elif key_meta in PAGE_UP:
            y = pgup(y, padhi)
        elif key_meta in PAGE_DOWN:
            y = pgdn(y, totlines, padhi)
        elif key_meta in CH_HOME:
            y = 0
        elif key_meta in CH_END:
            y = pgend(totlines, padhi)
        elif key_meta in {curses.KEY_RESIZE}|HELP|TOC:
            return key_meta
        pad.refresh(y,0, 6,5, rows - 5, cols - 5)
        key_meta = meta.getch()

    meta.clear()
    meta.refresh()
    return


def help(stdscr):
    rows, cols = stdscr.getmaxyx()
    hi, wi = rows - 4, cols - 4
    Y, X = 2, 2
    help = curses.newwin(hi, wi, Y, X)
    if COLORSUPPORT:
        help.bkgd(stdscr.getbkgd())

    help.box()
    help.keypad(True)
    help.addstr(1,2, "Help")
    help.addstr(2,2, "----")
    key_help = 0

    src = re.search("Key Bind(\n|.)*", __doc__).group()
    src_lines = src.splitlines()
    totlines = len(src_lines)

    pad = curses.newpad(totlines, wi - 2 )
    if COLORSUPPORT:
        pad.bkgd(stdscr.getbkgd())

    pad.keypad(True)
    for n, i in enumerate(src_lines):
        pad.addstr(n, 0, i)
    y = 0
    help.refresh()
    pad.refresh(y,0, Y+4,X+4, rows - 5, cols - 6)

    padhi = rows - 5 - Y - 4 + 1

    while key_help not in HELP|QUIT:
        if key_help in SCROLL_UP and y > 0:
            y -= 1
        elif key_help in SCROLL_DOWN and y < totlines - hi + 6:
            y += 1
        elif key_help in PAGE_UP:
            y = pgup(y, padhi)
        elif key_help in PAGE_DOWN:
            y = pgdn(y, totlines, padhi)
        elif key_help in CH_HOME:
            y = 0
        elif key_help in CH_END:
            y = pgend(totlines, padhi)
        elif key_help in {curses.KEY_RESIZE}|META|TOC:
            return key_help
        pad.refresh(y,0, 6,5, rows - 5, cols - 5)
        key_help = help.getch()

    help.clear()
    help.refresh()
    return


def dots_path(curr, tofi):
    candir = curr.split("/")
    tofi = tofi.split("/")
    alld = tofi.count("..")
    t = len(candir)
    candir = candir[0:t-alld-1]
    try:
        while True:
            tofi.remove("..")
    except ValueError:
        pass
    return "/".join(candir+tofi)


def find_media_viewer():
    global VWR
    VWR_LIST = [
        "feh",
        "gio",
        "sxiv",
        "gnome-open",
        "gvfs-open",
        "xdg-open",
        "kde-open",
        "firefox"
    ]
    if sys.platform == "win32":
        VWR = ["start"]
    elif sys.platform == "darwin":
        VWR = ["open"]
    else:
        for i in VWR_LIST:
            if shutil.which(i) is not None:
                VWR = [i]
                break

    if VWR[0] in {"gio"}:
        VWR.append("open")


def open_media(scr, epub, src):
    sfx = os.path.splitext(src)[1]
    fd, path = tempfile.mkstemp(suffix=sfx)
    try:
        with os.fdopen(fd, "wb") as tmp:
            tmp.write(epub.file.read(src))
        # run(VWR +" "+ path, shell=True)
        subprocess.call(
            VWR + [path],
            # shell=True,
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL
        )
        k = scr.getch()
    finally:
        os.remove(path)
    return k


def searching(stdscr, pad, src, width, y, ch, tot):
    global SEARCHPATTERN
    rows, cols = stdscr.getmaxyx()
    x = (cols - width) // 2

    if SEARCHPATTERN is None:
        stat = curses.newwin(1, cols, rows-1, 0)
        if COLORSUPPORT:
            stat.bkgd(stdscr.getbkgd())
        stat.keypad(True)
        curses.echo(1)
        curses.curs_set(1)
        SEARCHPATTERN = ""
        stat.addstr(0, 0, " Regex:", curses.A_REVERSE)
        stat.addstr(0, 7, SEARCHPATTERN)
        stat.refresh()
        while True:
            ipt = stat.getch()
            if ipt == 27:
                stat.clear()
                stat.refresh()
                curses.echo(0)
                curses.curs_set(0)
                SEARCHPATTERN = None
                return None, y
            elif ipt == 10:
                SEARCHPATTERN = "/"+SEARCHPATTERN
                stat.clear()
                stat.refresh()
                curses.echo(0)
                curses.curs_set(0)
                break
            # TODO: why different behaviour unix dos or win lin
            elif ipt in {8, curses.KEY_BACKSPACE}:
                SEARCHPATTERN = SEARCHPATTERN[:-1]
            elif ipt == curses.KEY_RESIZE:
                stat.clear()
                stat.refresh()
                curses.echo(0)
                curses.curs_set(0)
                SEARCHPATTERN = None
                return curses.KEY_RESIZE, None
            else:
                SEARCHPATTERN += chr(ipt)

            stat.clear()
            stat.addstr(0, 0, " Regex:", curses.A_REVERSE)
            # stat.addstr(0, 7, SEARCHPATTERN)
            stat.addstr(
                    0, 7,
                    SEARCHPATTERN if 7+len(SEARCHPATTERN) < cols else "..."+SEARCHPATTERN[7-cols+4:]
                    )
            stat.refresh()

    if SEARCHPATTERN in {"?", "/"}:
        SEARCHPATTERN = None
        return None, y

    found = []
    try:
        pattern = re.compile(SEARCHPATTERN[1:], re.IGNORECASE)
    except re.error:
        stdscr.addstr(rows-1, 0, "Invalid Regex!", curses.A_REVERSE)
        SEARCHPATTERN = None
        s = stdscr.getch()
        if s in QUIT:
            return None, y
        else:
            return s, None

    for n, i in enumerate(src):
        for j in pattern.finditer(i):
            found.append([n, j.span()[0], j.span()[1] - j.span()[0]])

    if found == []:
        if SEARCHPATTERN[0] == "/" and ch + 1 < tot:
            return None, 1
        elif SEARCHPATTERN[0] == "?" and ch > 0:
            return None, -1
        else:
            s = 0
            while True:
                if s in QUIT:
                    SEARCHPATTERN = None
                    stdscr.clear()
                    stdscr.refresh()
                    return None, y
                elif s == ord("n") and ch == 0:
                    SEARCHPATTERN = "/"+SEARCHPATTERN[1:]
                    return None, 1
                elif s == ord("N") and ch +1 == tot:
                    SEARCHPATTERN = "?"+SEARCHPATTERN[1:]
                    return None, -1

                stdscr.clear()
                stdscr.addstr(rows-1, 0, " Finished searching: " + SEARCHPATTERN[1:cols-22] + " ", curses.A_REVERSE)
                stdscr.refresh()
                pad.refresh(y,0, 0,x, rows-2,x+width)
                s = pad.getch()

    sidx = len(found) - 1
    if SEARCHPATTERN[0] == "/":
        if y > found[-1][0]:
            return None, 1
        for n, i in enumerate(found):
            if i[0] >= y:
                sidx = n
                break

    s = 0
    msg = " Searching: " + SEARCHPATTERN[1:] + " --- Res {}/{} Ch {}/{} ".format(
        sidx + 1,
        len(found),
        ch+1, tot)
    while True:
        if s in QUIT:
            SEARCHPATTERN = None
            for i in found:
                pad.chgat(i[0], i[1], i[2], pad.getbkgd())
            stdscr.clear()
            stdscr.refresh()
            return None, y
        elif s == ord("n"):
            SEARCHPATTERN = "/"+SEARCHPATTERN[1:]
            if sidx == len(found) - 1:
                if ch + 1 < tot:
                    return None, 1
                else:
                    s = 0
                    msg = " Finished searching: " + SEARCHPATTERN[1:] + " "
                    continue
            else:
                sidx += 1
                msg = " Searching: " + SEARCHPATTERN[1:] + " --- Res {}/{} Ch {}/{} ".format(
                    sidx + 1,
                    len(found),
                    ch+1, tot)
        elif s == ord("N"):
            SEARCHPATTERN = "?"+SEARCHPATTERN[1:]
            if sidx == 0:
                if ch > 0:
                    return None, -1
                else:
                    s = 0
                    msg = " Finished searching: " + SEARCHPATTERN[1:] + " "
                    continue
            else:
                sidx -= 1
                msg = " Searching: " + SEARCHPATTERN[1:] + " --- Res {}/{} Ch {}/{} ".format(
                    sidx + 1,
                    len(found),
                    ch+1, tot)
        elif s == curses.KEY_RESIZE:
            return s, None

        while found[sidx][0] not in list(range(y, y+rows-1)):
            if found[sidx][0] > y:
                y += rows - 1
            else:
                y -= rows - 1
                if y < 0:
                    y = 0

        for n, i in enumerate(found):
            # attr = (pad.getbkgd() | curses.A_REVERSE) if n == sidx else pad.getbkgd()
            attr = curses.A_REVERSE if n == sidx else curses.A_NORMAL
            pad.chgat(i[0], i[1], i[2], pad.getbkgd() | attr)

        stdscr.clear()
        stdscr.addstr(rows-1, 0, msg, curses.A_REVERSE)
        stdscr.refresh()
        pad.refresh(y,0, 0,x, rows-2,x+width)
        s = pad.getch()


def reader(stdscr, ebook, index, width, y, pctg):
    k = 0 if SEARCHPATTERN is None else ord("/")
    rows, cols = stdscr.getmaxyx()
    x = (cols - width) // 2

    contents = ebook.contents
    toc_src = ebook.toc_entries
    chpath = contents[index]
    content = ebook.file.open(chpath).read()
    content = content.decode("utf-8")

    parser = HTMLtoLines()
    try:
        parser.feed(content)
        parser.close()
    except:
        pass

    src_lines, imgs = parser.get_lines(width)
    totlines = len(src_lines)

    if y < 0 and totlines <= rows:
        y = 0
    elif pctg is not None:
        y = round(pctg*totlines)
    else:
        y = y % totlines

    pad = curses.newpad(totlines, width + 2) # + 2 unnecessary

    if COLORSUPPORT:
        pad.bkgd(stdscr.getbkgd())

    pad.keypad(True)
    for n, i in enumerate(src_lines):
        if re.search("\[IMG:[0-9]+\]", i):
            pad.addstr(n, width//2 - len(i)//2, i, curses.A_REVERSE)
        else:
            pad.addstr(n, 0, i)
    if index == 0:
        suff = "     End --> "
    elif index == len(contents) - 1:
        suff = " <-- End     "
    else:
        suff = " <-- End --> "
    # try except to be more flexible on terminal resize
    try:
        pad.addstr(n, width//2 - 7, suff, curses.A_REVERSE)
    except curses.error:
        pass

    stdscr.clear()
    stdscr.refresh()
    # try except to be more flexible on terminal resize
    try:
        pad.refresh(y,0, 0,x, rows-1,x+width)
    except curses.error:
        pass

    countstring = ""
    svline = "dontsave"
    while True:
        if countstring == "":
            count = 1
        else:
            count = int(countstring)
        if k in range(48, 58): # i.e., k is a numeral
            countstring = countstring + chr(k)
        else:
            if k in QUIT:
                if k == 27 and countstring != "":
                    countstring = ""
                else:
                    savestate(ebook.path, index, width, y, y/totlines)
                    sys.exit()
            elif k in SCROLL_UP:
                if count > 1:
                    svline = y - 1
                if y >= count:
                    y -= count
                elif y == 0 and index != 0:
                    return -1, width, -rows, None
                else:
                    y = 0
            elif k in PAGE_UP:
                if y == 0 and index != 0:
                    return -1, width, -rows, None
                else:
                    y = pgup(y, rows, LINEPRSRV, count)
            elif k in SCROLL_DOWN:
                if count > 1:
                    svline = y + rows - 1
                if y + count <= totlines - rows:
                    y += count
                elif y == totlines - rows and index != len(contents)-1:
                    return 1, width, 0, None
                else:
                    y = totlines - rows
            elif k in PAGE_DOWN:
                if totlines - y - LINEPRSRV > rows:
                    # y = pgdn(y, totlines, rows, LINEPRSRV, count)
                    y += rows - LINEPRSRV
                elif index != len(contents)-1:
                    return 1, width, 0, None
            elif k in HALF_UP:
                countstring = str(rows//2)
                k = list(SCROLL_UP)[0]
                continue
            elif k in HALF_DOWN:
                countstring = str(rows//2)
                k = list(SCROLL_DOWN)[0]
                continue
            elif k in CH_NEXT:
                if index + count < len(contents) - 1:
                    return count, width, 0, None
                if index + count >= len(contents) - 1:
                    return len(contents) - index - 1, width, 0, None
            elif k in CH_PREV:
                if index - count > 0:
                   return -count, width, 0, None
                elif index - count <= 0:
                   return -index, width, 0, None
            elif k in CH_HOME:
                y = 0
            elif k in CH_END:
                y = pgend(totlines, rows)
            elif k in TOC:
                fllwd = toc(stdscr, toc_src, index)
                if fllwd is not None:
                    if fllwd in {curses.KEY_RESIZE}|HELP|META:
                        k = fllwd
                        continue
                    return fllwd - index, width, 0, None
            elif k in META:
                k = meta(stdscr, ebook)
                if k in {curses.KEY_RESIZE}|HELP|TOC:
                    continue
            elif k in HELP:
                k = help(stdscr)
                if k in {curses.KEY_RESIZE}|META|TOC:
                    continue
            elif k == WIDEN and (width + count) < cols - 4:
                width += count
                return 0, width, 0, y/totlines
            elif k == SHRINK:
                width -= count
                if width < 20:
                    width = 20
                return 0, width, 0, y/totlines
            elif k == WIDTH:
                if countstring == "":
                    # if called without a count, toggle between 80 cols and full width
                    if width != 80 and cols - 4 >= 80:
                        return 0, 80, 0, y/totlines
                    else:
                        return 0, cols - 4, 0, y/totlines
                else:
                    width = count
                if width < 20:
                    width = 20
                elif width >= cols - 4:
                    width = cols - 4
                return 0, width, 0, y/totlines
            # elif k == ord("0"):
            #     if width != 80 and cols - 2 >= 80:
            #         return 0, 80, 0, y/totlines
            #     else:
            #         return 0, cols - 2, 0, y/totlines
            elif k == ord("/"):
                ks, idxs = searching(stdscr, pad, src_lines, width, y, index, len(contents))
                if ks in {curses.KEY_RESIZE, ord("/")}:
                    k = ks
                    continue
                elif SEARCHPATTERN is not None:
                    return idxs, width, 0, None
                elif idxs is not None:
                    y = idxs
            elif k == ord("o") and VWR is not None:
                gambar, idx = [], []
                for n, i in enumerate(src_lines[y:y+rows]):
                    img = re.search("(?<=\[IMG:)[0-9]+(?=\])", i)
                    if img is not None:
                        gambar.append(img.group())
                        idx.append(n)

                impath = ""
                if len(gambar) == 1:
                    impath = imgs[int(gambar[0])]
                elif len(gambar) > 1:
                    p, i = 0, 0
                    while p not in QUIT and p not in FOLLOW:
                        stdscr.move(idx[i], x + width//2 + len(gambar[i]) + 1)
                        stdscr.refresh()
                        curses.curs_set(1)
                        p = pad.getch()
                        if p in SCROLL_DOWN:
                            i += 1
                        elif p in SCROLL_UP:
                            i -= 1
                        i = i % len(gambar)

                    curses.curs_set(0)
                    if p in FOLLOW:
                        impath = imgs[int(gambar[i])]

                if impath != "":
                    imgsrc = dots_path(chpath, impath)
                    k = open_media(pad, ebook, imgsrc)
                    continue
            elif k == MARKPOS:
                jumnum = pad.getch()
                if jumnum in range(49, 58):
                    JUMPLIST[chr(jumnum)] = [index, width, y, y/totlines]
                else:
                    k = jumnum
                    continue
            elif k == JUMPTOPOS:
                jumnum = pad.getch()
                if jumnum in range(49, 58) and chr(jumnum) in JUMPLIST.keys():
                    tojumpidxdiff = JUMPLIST[chr(jumnum)][0]-index
                    tojumpy = JUMPLIST[chr(jumnum)][2]
                    tojumpctg = None if JUMPLIST[chr(jumnum)][1] == width else JUMPLIST[chr(jumnum)][3]
                    return tojumpidxdiff, width, tojumpy, tojumpctg
                else:
                    k = jumnum
                    continue
            elif k == COLORSWITCH and COLORSUPPORT and countstring in {"", "0", "1", "2"}:
                if countstring == "":
                    count_color = curses.pair_number(stdscr.getbkgd())
                    if count_color not in {2, 3}: count_color = 1
                    count_color = count_color % 3
                else:
                    count_color = count
                stdscr.bkgd(curses.color_pair(count_color+1))
                return 0, width, y, None
            elif k == curses.KEY_RESIZE:
                savestate(ebook.path, index, width, y, y/totlines)
                # stated in pypi windows-curses page:
                # to call resize_term right after KEY_RESIZE
                if sys.platform == "win32":
                    curses.resize_term(rows, cols)
                    rows, cols = stdscr.getmaxyx()
                else:
                    rows, cols = stdscr.getmaxyx()
                    curses.resize_term(rows, cols)
                if cols < 22 or rows < 12:
                    sys.exit("ERR: Screen was too small (min 22cols x 12rows).")
                if cols <= width + 4:
                    return 0, cols - 4, 0, y/totlines
                else:
                    return 0, width, y, None
            countstring = ""

        if svline != "dontsave":
            pad.chgat(svline, 0, width, curses.A_UNDERLINE)
        try:
            stdscr.clear()
            stdscr.addstr(0, 0, countstring)
            stdscr.refresh()
            if totlines - y < rows:
                pad.refresh(y,0, 0,x, totlines-y,x+width)
            else:
                pad.refresh(y,0, 0,x, rows-1,x+width)
        except curses.error:
            pass
        k = pad.getch()

        if svline != "dontsave":
            pad.chgat(svline, 0, width, curses.A_NORMAL)
            svline = "dontsave"


def preread(stdscr, file):
    global COLORSUPPORT

    curses.use_default_colors()
    try:
        curses.init_pair(1, -1, -1)
        curses.init_pair(2, DARK[0], DARK[1])
        curses.init_pair(3, LIGHT[0], LIGHT[1])
        COLORSUPPORT = True
    except:
        COLORSUPPORT  = False

    stdscr.keypad(True)
    curses.curs_set(0)
    stdscr.clear()
    rows, cols = stdscr.getmaxyx()
    stdscr.addstr(rows-1,0, "Loading...")
    stdscr.refresh()

    epub = Epub(file)

    if epub.path in STATE:
        idx = int(STATE[epub.path]["index"])
        width = int(STATE[epub.path]["width"])
        y = int(STATE[epub.path]["pos"])
        pctg = None
    else:
        STATE[epub.path] = {}
        idx = 0
        y = 0
        width = 80
        pctg = None

    if cols <= width + 4:
        width = cols - 4
        if "pctg" in STATE[epub.path]:
            pctg = float(STATE[epub.path]["pctg"])

    epub.initialize()
    find_media_viewer()

    while True:
        incr, width, y, pctg = reader(stdscr, epub, idx, width, y, pctg)
        idx += incr


def main():
    termc, termr = shutil.get_terminal_size()

    args = []
    if sys.argv[1:] != []:
        args += sys.argv[1:]

    if len({"-h", "--help"} & set(args)) != 0:
        hlp = __doc__.rstrip()
        if "-h" in args:
            hlp = re.search("(\n|.)*(?=\n\nKey)", hlp).group()
        print(hlp)
        sys.exit()

    if len({"-v", "--version", "-V"} & set(args)) != 0:
        print(__version__)
        print(__license__, "License")
        print("Copyright (c) 2019", __author__)
        print(__url__)
        sys.exit()

    if len({"-d"} & set(args)) != 0:
        args.remove("-d")
        dump = True
    else:
        dump = False

    loadstate()

    if args == []:
        file, todel = False, []
        for i in STATE:
            if not os.path.exists(i):
                todel.append(i)
            elif STATE[i]["lastread"] == str(1):
                file = i

        for i in todel:
            del STATE[i]

        if not file:
            print(__doc__)
            sys.exit("ERROR: Found no last read file.")

    elif os.path.isfile(args[0]):
        file = args[0]

    else:
        val = cand = 0
        todel = []
        for i in STATE.keys():
            if not os.path.exists(i):
                todel.append(i)
            else:
                match_val = sum([j.size for j in SM(None, i.lower(), " ".join(args).lower()).get_matching_blocks()])
                if match_val >= val:
                    val = match_val
                    cand = i
        for i in todel:
            del STATE[i]
        with open(STATEFILE, "w") as f:
            json.dump(STATE, f, indent=4)
        if len(args) == 1 and re.match(r"[0-9]+", args[0]) is not None:
            try:
                cand = list(STATE.keys())[int(args[0])-1]
                val = 1
            except IndexError:
                val = 0
        if val != 0 and len({"-r"} & set(args)) == 0:
            file = cand
        else:
            print("Reading history:")
            dig = len(str(len(STATE.keys())+1))
            for n, i in enumerate(STATE.keys()):
                print(str(n+1).rjust(dig) + ("* " if STATE[i]["lastread"] == "1" else "  ") + i)
            if len({"-r"} & set(args)) != 0:
                sys.exit()
            else:
                print()
                sys.exit("ERROR: Found no matching history.")

    if dump:
        epub = Epub(file)
        epub.initialize()
        for i in epub.contents:
            content = epub.file.open(i).read()
            content = content.decode("utf-8")
            parser = HTMLtoLines()
            try:
                parser.feed(content)
                parser.close()
            except:
                pass
            src_lines = parser.get_lines()
            # sys.stdout.reconfigure(encoding="utf-8")  # Python>=3.7
            for j in src_lines:
                sys.stdout.buffer.write((j+"\n\n").encode("utf-8"))
        sys.exit()

    else:
        if termc < 22 or termr < 12:
            sys.exit("ERR: Screen was too small (min 22cols x 12rows).")
        curses.wrapper(preread, file)


if __name__ == "__main__":
    main()