# -*- coding: utf-8 -*-

import curses.wrapper

import curses.ascii

import locale

import logging

from tuikit.driver import Driver

class MouseEvent:

    def __init__(self, x=0, y=0):

        self.x = x   # global coordinates

        self.y = y

        self.wx = x  # local widget coordinates

        self.wy = y

        self.px = 0  # parent coordinates

        self.py = 0

        self.button = 0

    def childevent(self, child):

        ev = MouseEvent(self.x, self.y)

        # original local coordinates are new parent coordinates

        ev.px = self.wx

        ev.py = self.wy

        # update local coordinates

        ev.wx = self.wx - child.x

        ev.wy = self.wy - child.y

        return ev

class DriverCurses(Driver):

    xterm_codes = (

        (0x09,                      'tab'           ),

        (0x0a,                      'enter'         ),

        (0x7f,                      'backspace'     ),

        (0x1b,                      'escape'        ),

        (0x1b,0x4f,0x50,            'f1'            ),

        (0x1b,0x4f,0x51,            'f2'            ),

        (0x1b,0x4f,0x52,            'f3'            ),

        (0x1b,0x4f,0x53,            'f4'            ),

        (0x1b,0x5b,0x31,0x35,0x7e,  'f5'            ),

        (0x1b,0x5b,0x31,0x37,0x7e,  'f6'            ),

        (0x1b,0x5b,0x31,0x38,0x7e,  'f7'            ),

        (0x1b,0x5b,0x31,0x39,0x7e,  'f8'            ),

        (0x1b,0x5b,0x31,0x7e,       'home'          ),  # linux

        (0x1b,0x5b,0x32,0x30,0x7e,  'f9'            ),

        (0x1b,0x5b,0x32,0x31,0x7e,  'f10'           ),

        (0x1b,0x5b,0x32,0x33,0x7e,  'f11'           ),

        (0x1b,0x5b,0x32,0x34,0x7e,  'f12'           ),

        (0x1b,0x5b,0x32,0x7e,       'insert'        ),

        (0x1b,0x5b,0x33,0x7e,       'delete'        ),

        (0x1b,0x5b,0x34,0x7e,       'end'           ),  # linux

        (0x1b,0x5b,0x35,0x7e,       'pageup'        ),

        (0x1b,0x5b,0x36,0x7e,       'pagedown'      ),

        (0x1b,0x5b,0x41,            'up'            ),

        (0x1b,0x5b,0x42,            'down'          ),

        (0x1b,0x5b,0x43,            'right'         ),

        (0x1b,0x5b,0x44,            'left'          ),

        (0x1b,0x5b,0x46,            'end'           ),

        (0x1b,0x5b,0x48,            'home'          ),

        (0x1b,0x5b,0x4d,            'mouse'         ),

        (0x1b,0x5b,0x5b,0x41,       'f1'            ),  # linux

        (0x1b,0x5b,0x5b,0x42,       'f2'            ),  # linux

        (0x1b,0x5b,0x5b,0x43,       'f3'            ),  # linux

        (0x1b,0x5b,0x5b,0x44,       'f4'            ),  # linux

        (0x1b,0x5b,0x5b,0x45,       'f5'            ),  # linux

    )

    color_names = {

        'black'   : curses.COLOR_BLACK,

        'blue'    : curses.COLOR_BLUE,

        'cyan'    : curses.COLOR_CYAN,

        'green'   : curses.COLOR_GREEN,

        'magenta' : curses.COLOR_MAGENTA,

        'red'     : curses.COLOR_RED,

        'white'   : curses.COLOR_WHITE,

        'yellow'  : curses.COLOR_YELLOW,

    }

    def __init__(self):

        '''Set driver attributes to default values.'''

        Driver.__init__(self)

        self.log = logging.getLogger('tuikit')

        self.screen = None

        self.cursor = None

        self.colors = {}     # maps names to curses attributes

        self.colorpairs = {} # maps tuple (fg,bg) to curses color_pair

        self.colorstack = [] # pushcolor/popcolor puts or gets attributes from this

        self.colorprefix = [] # stack of color prefixes

        self.inputqueue = []

        self.mbtnstack = []

    def init_curses(self):

        '''Initialize curses'''

        self.size.h, self.size.w = self.screen.getmaxyx()

        self.screen.immedok(0)

        self.screen.keypad(0)

        curses.curs_set(False)  # hide cursor

        curses.mousemask(curses.ALL_MOUSE_EVENTS | curses.REPORT_MOUSE_POSITION)

        curses.mouseinterval(0)  # do not wait to detect clicks, we use only press/release

    def start(self, mainfunc):

        def main(screen):

            self.screen = screen

            self.init_curses()

            mainfunc()

        curses.wrapper(main)

    ## colors, attributes ##

    def _parsecolor(self, name):

        name = name.lower().strip()

        return self.color_names[name]

    def _getcolorpair(self, fg, bg):

        pair = (fg, bg)

        if pair in self.colorpairs:

            return self.colorpairs[pair]

        num = len(self.colorpairs) + 1

        curses.init_pair(num, fg, bg)

        self.colorpairs[pair] = num

        return num

    def _parseattrs(self, attrs):

        res = 0

        for a in attrs:

            a = a.lower().strip()

            trans = {

                'blink'     : curses.A_BLINK,

                'bold'      : curses.A_BOLD,

                'dim'       : curses.A_DIM,

                'standout'  : curses.A_STANDOUT,

                'underline' : curses.A_UNDERLINE,

            }

            res = res | trans[a]

        return res

    def setcolor(self, name, desc):

        parts = desc.split(',')

        fg, bg = parts[0].split(' on ')

        attrs = parts[1:]

        fg = self._parsecolor(fg)

        bg = self._parsecolor(bg)

        col = self._getcolorpair(fg, bg)

        attr = self._parseattrs(attrs)

        self.colors[name] = curses.color_pair(col) | attr

    def pushcolor(self, name):

        # add prefix if available

        if len(self.colorprefix):

            prefixname = self.colorprefix[-1] + name

            if prefixname in self.colors:

                name = prefixname

        attr = self.colors[name]

        self.screen.attrset(attr)

        self.colorstack.append(attr)

    def popcolor(self):

        self.colorstack.pop()

        if len(self.colorstack):

            attr = self.colorstack[-1]

        else:

            attr = 0

        self.screen.attrset(attr)

    def pushcolorprefix(self, name):

        self.colorprefix.append(name)

    def popcolorprefix(self):

        self.colorprefix.pop()

    ## drawing ##

    def putch(self, x, y, c):

        if not self.clipstack.test(x, y):

            return

        try:

            if isinstance(c, str) and len(c) == 1:

                self.screen.addstr(y, x, c)

            else:

                self.screen.addch(y, x, c)

        except curses.error:

            pass

    def erase(self):

        self.screen.erase()

    def commit(self):

        if self.cursor:

            self.screen.move(*self.cursor)

            curses.curs_set(True)

        else:

            curses.curs_set(False)

        self.screen.refresh()

    ## cursor ##

    def showcursor(self, x, y):

        if not self.clipstack.test(x, y):

            return

        self.cursor = (y, x)

    def hidecursor(self):

        curses.curs_set(False)

        self.cursor = None

    ## input ##

    def inputqueue_fill(self, timeout=None):

        if timeout is None:

            # wait indefinitely

            c = self.screen.getch()

            self.inputqueue.insert(0, c)

        elif timeout > 0:

            # wait

            curses.halfdelay(timeout)

            c = self.screen.getch()

            curses.cbreak()

            if c == -1:

                return

            self.inputqueue.insert(0, c)

        # timeout = 0 -> no wait

        self.screen.nodelay(1)

        while True:

            c = self.screen.getch()

            if c == -1:

                break

            self.inputqueue.insert(0, c)

        self.screen.nodelay(0)

    def inputqueue_top(self, num=0):

        return self.inputqueue[-1-num]

    def inputqueue_get(self):

        c = None

        try:

            c = self.inputqueue.pop()

        except IndexError:

            pass

        return c

    def inputqueue_get_wait(self):

        c = None

        while c is None:

            try:

                c = self.inputqueue.pop()

            except IndexError:

                curses.napms(25)

                self.inputqueue_fill(0)

        return c

    def inputqueue_unget(self, c):

        self.inputqueue.append(c)

    def getevents(self, timeout=None):

        # empty queue -> fill

        if len(self.inputqueue) == 0:

            self.inputqueue_fill(timeout)

        res = []

        while len(self.inputqueue):

            c = self.inputqueue_get()

            if c == curses.KEY_MOUSE:

                res += self.process_mouse()

            elif c == curses.KEY_RESIZE:

                self.size.h, self.size.w = self.screen.getmaxyx()

                res.append(('resize',))

            elif curses.ascii.isctrl(c):

                self.inputqueue_unget(c)

                res += self.process_control_chars()

            elif c >= 192 and c <= 255:

                self.inputqueue_unget(c)

                res += self.process_utf8_chars()

            elif curses.ascii.isprint(c):

                res += [('keypress', None, str(chr(c)))]

            else:

                #self.top.keypress(None, unicode(chr(c)))

                self.inputqueue_unget(c)

                res += self.process_control_chars()

        return res

    def process_mouse(self):

        try:

        except curses.error:

            return []

        ev = MouseEvent(x, y)

        out = []

        if bstate & curses.REPORT_MOUSE_POSITION:

            out += [('mousemove', ev)]

        if bstate & curses.BUTTON1_PRESSED:

            ev.button = 1

            out += [('mousedown', ev)]

        if bstate & curses.BUTTON3_PRESSED:

            ev.button = 3

            out += [('mousedown', ev)]

        if bstate & curses.BUTTON1_RELEASED:

            ev.button = 1

            out += [('mouseup', ev)]

        if bstate & curses.BUTTON3_RELEASED:

            ev.button = 3

            out += [('mouseup', ev)]

        return out

    def process_utf8_chars(self):

        #FIXME read exact number of chars as defined by utf-8

        utf = []

        while len(utf) <= 6:

            c = self.inputqueue_get_wait()

            utf.append(c)

            try:

                uni = str(bytes(utf), 'utf-8')

                return [('keypress', None, uni)]

            except UnicodeDecodeError:

                continue

        raise Exception('Invalid UTF-8 sequence: %r' % utf)

    def process_control_chars(self):

        codes = self.xterm_codes

        matchingcodes = []

        match = None

        consumed = []

        # consume next char, filter out matching codes

        c = self.inputqueue_get_wait()

        consumed.append(c)

        while True:

            self.log.debug('c=%s len=%s', c, len(codes))

            for code in codes:

                if c == code[len(consumed)-1]:

                    if len(code) - 1 == len(consumed):

                        match = code

                    else:

                        matchingcodes += [code]

            self.log.debug('matching=%s', len(matchingcodes))

            # match found, or no matching code found -> stop

            if len(matchingcodes) == 0:

                break

            # match found and some sequencies still match -> continue

            if len(matchingcodes) > 0:

                if len(self.inputqueue) == 0:

                    self.inputqueue_fill(1)

            c = self.inputqueue_get()

            if c:

                consumed.append(c)

                codes = matchingcodes

                matchingcodes = []

            else:

                break

        keyname = None

        if match:

            # compare match to consumed, return unused chars

            l = len(match) - 1

            while len(consumed) > l:

                self.inputqueue_unget(consumed[-1])

                del consumed[-1]

            keyname = match[-1]

        if match is None:

            self.log.debug('Unknown control sequence: %s',

                ','.join(['0x%x'%x for x in consumed]))

            return [('keypress', 'Unknown', None)]

        if keyname == 'mouse':

            return self.process_xterm_mouse()

        return [('keypress', keyname, None)]

    def process_xterm_mouse(self):

        t = self.inputqueue_get_wait()

        x = self.inputqueue_get_wait() - 0x21

        y = self.inputqueue_get_wait() - 0x21

        ev = MouseEvent(x, y)

        out = []

        if t in (0x20, 0x21, 0x22): # button press

            btn = t - 0x1f

            ev.button = btn

            if not btn in self.mbtnstack:

                self.mbtnstack.append(btn)

                out += [('mousedown', ev)]

            else:

                out += [('mousemove', ev)]

        elif t == 0x23: # button release

            ev.button = self.mbtnstack.pop()

            out += [('mouseup', ev)]

        elif t in (0x60, 0x61): # wheel up, down

            ev.button = 4 + t - 0x60

            out += [('mousewheel', ev)]

        else:

            raise Exception('Unknown mouse event: %x' % t)

        return out