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

import curses.wrapper

import curses.ascii

import math

import logging

from tuikit.driver import Driver

class DriverCurses(Driver):

    key_codes = (

        (0x09,                      'tab'           ),

        (0x0a,                      'enter'         ),

        (0x7f,                      'backspace'     ),

        (0x1b,                      'escape'        ),

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

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

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

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

        (0x1b,0x5b,                 'CSI'           ),  # see csi_codes

    )

    # http://en.wikipedia.org/wiki/ANSI_escape_code

    csi_codes = (

        # code            param     key name

        (0x7e,              1,      'home'          ),  # linux

        (0x7e,              2,      'insert'        ),

        (0x7e,              3,      'delete'        ),

        (0x7e,              4,      'end'           ),  # linux

        (0x7e,              5,      'pageup'        ),

        (0x7e,              6,      'pagedown'      ),

        (0x7e,              15,     'f5'            ),

        (0x7e,              17,     'f6'            ),

        (0x7e,              18,     'f7'            ),

        (0x7e,              19,     'f8'            ),

        (0x7e,              20,     'f9'            ),

        (0x7e,              21,     'f10'           ),

        (0x7e,              23,     'f11'           ),

        (0x7e,              24,     'f12'           ),

        (0x41,              1,      'up'            ),

        (0x42,              1,      'down'          ),

        (0x43,              1,      'right'         ),

        (0x44,              1,      'left'          ),

        (0x46,              1,      'end'           ),  # xterm

        (0x48,              1,      'home'          ),  # xterm

        (0x5b,0x41,         1,      'f1'            ),  # linux

        (0x5b,0x42,         1,      'f2'            ),  # linux

        (0x5b,0x43,         1,      'f3'            ),  # linux

        (0x5b,0x44,         1,      'f4'            ),  # linux

        (0x5b,0x45,         1,      'f5'            ),  # linux

    )

    color_map = {

        '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,

    }

    attr_map = {

        'blink'     : curses.A_BLINK,

        'bold'      : curses.A_BOLD,

        'dim'       : curses.A_DIM,

        'standout'  : curses.A_STANDOUT,  # inverse bg/fg

        'underline' : curses.A_UNDERLINE,

    }

    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.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_map[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()

            res = res | self.attr_map[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 such color is 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)

    ## 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):

        """Wait for curses input, add it to inputqueue.

        timeout -- int, tenths of second (None=infinite)

        """

        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):

        '''Process input, return list of events.

        timeout -- float, in seconds

        '''

        # empty queue -> fill

        if len(self.inputqueue) == 0:

            if timeout is not None:

                timeout = math.ceil(timeout * 10)

            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.inputqueue_unget(c)

                res += self.process_control_chars()

        return res

    def process_mouse(self):

        try:

            _id, x, y, _z, bstate = curses.getmouse()

        except curses.error:

            return []

        out = []

        if bstate & curses.REPORT_MOUSE_POSITION:

            out += [('mousemove', x, y)]

        if bstate & curses.BUTTON1_PRESSED:

            out += [('mousedown', x, y, 1)]

        if bstate & curses.BUTTON3_PRESSED:

            out += [('mousedown', x, y, 3)]

        if bstate & curses.BUTTON1_RELEASED:

            out += [('mouseup', x, y, 1)]

        if bstate & curses.BUTTON3_RELEASED:

            out += [('mouseup', x, y, 3)]

        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.key_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 == 'CSI':

            return self.process_control_sequence()

        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

        out = []

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

            btn = t - 0x1f

            if not btn in self.mbtnstack:

                self.mbtnstack.append(btn)

                out += [('mousedown', x, y, btn)]

            else:

                out += [('mousemove', x, y, btn)]

        elif t == 0x23: # button release

            btn = self.mbtnstack.pop()

            out += [('mouseup', x, y, btn)]

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

            btn = 4 + t - 0x60

            out += [('mousewheel', x, y, btn)]

        else:

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

        return out

    def process_control_sequence(self):

        codes = self.csi_codes

        debug_seq = [0x1b, 0x5b]

        c = self.inputqueue_get_wait()

        debug_seq.append(c)

        # numeric parameters?

        params = []

        if chr(c).isdigit():

            params.append(chr(c))

            while True:

                c = self.inputqueue_get_wait()

                debug_seq.append(c)

                if chr(c).isdigit():

                    params[-1] += chr(c)

                elif chr(c) == ';':

                    params.append('')

                else:

                    break

        params = [int(x) for x in params]

        if len(params) == 0:

            params = [1]

        # filter codes using

        while True:

            matching_codes = []

            for code in codes:

                if len(code) > 2 and code[0] == c:

                    matching_codes.append(code[1:])

            codes = matching_codes

            if len(codes) == 0:

                # no match -> unknown code

                seq = ','.join(['0x%x' % x for x in debug_seq])

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

                return [('keypress', 'Unknown:' + seq, None)]

            elif len(codes) == 1:

                # one match -> we got the winner

                break

            elif len(codes[0]) == 2:

                # more than one matching, but no more chars to check

                # will be sorted out using parameters

                break

            else:

                # more than one matching -> continue loop

                c = self.inputqueue_get_wait()

                debug_seq.append(c)

        # filter codes using first parameter

        matching_codes = []

        for code in codes:

            if params[0] == code[0] or params[0] is None:

                matching_codes.append(code)

        if len(matching_codes) == 0:

            # no match -> unknown code

            seq = ','.join(['0x%x' % x for x in debug_seq])

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

            return [('keypress', 'Unknown:' + seq, None)]

        if len(matching_codes) > 1:

            raise Exception('Internal error: invalid csi_codes, more than one matching')

        keyname = matching_codes[0][1]

        # modifiers

        mod = 0

        if len(params) > 1:

            mod = params[1] - 1

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