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

from tuikit.events import Event, Emitter

class Select:

    def __init__(self, selected=None):

        if not hasattr(self, '_options'):

            raise TypeError('Cannot instantiate Select class.')

        self._selected = selected or self._options[0]

    def update(self, selected):

        if selected not in self._options:

            raise ValueError('Select: %r not in options %r' % (selected, self._options))

        self._selected = selected

    def select_next(self):

        i = self._options.index(self._selected)

        try:

            self._selected = self._options[i+1]

        except IndexError:

            self._selected = self._options[0]

    @property

    def selected(self):

        return self._selected

    def get_value(self):

        return self._selected

    def __repr__(self):

        return self.__class__.__name__ + '(%r)' % self._selected

def make_select(*args):

    name = ''.join([x.capitalize() for x in args]) + 'Select'

    return type(name, (Select,), {'_options': args})

class Coords(Emitter):

    '''2D coordinates.'''

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

        self._x = x

        self._y = y

        self.add_events('change', Event)

    @property

    def x(self):

        return self._x

    @x.setter

    def x(self, value):

        self._x = value

        self.emit('change')

    @property

    def y(self):

        return self._y

    @y.setter

    def y(self, value):

        self._y = value

        self.emit('change')

    def __getitem__(self, key):

        try:

            tupl = (self.x, self.y)

            return tupl[key]

        except TypeError:

            pass

        return self.__dict__[key]

    def __setitem__(self, key, value):

        if key == 0:

            self.x = value

        if key == 1:

            self.y = value

    def __repr__(self):

        return 'Coords(x={0.x},y={0.y})'.format(self)

    def update(self, x=None, y=None):

        old_x, old_y = self._x, self._y

        if isinstance(x, Coords) and y is None:

            self._x, self._y = x

        else:

            if isinstance(x, int):

                self._x = x

            elif x is not None:

                raise ValueError('Coords.update(): first parameter must be int or Coords')

            if isinstance(y, int):

                self._y = y

            elif y is not None:

                raise ValueError('Coords.update(): second parameter must be int')

        if self._x != old_x or self._y != old_y:

            self.emit('change')

class Size(Emitter):

    '''Size class.

    Implements attribute access (.w, .h), list-like access([0],[1])

    and dict-like access (['w'],['h']).

    '''

    def __init__(self, w=None, h=None):

        self._w = w

        self._h = h

        self.add_events('change', Event)

    @property

    def w(self):

        return self._w

    @w.setter

    def w(self, value):

        self._w = value

        self.emit('change')

    @property

    def h(self):

        return self._h

    @h.setter

    def h(self, value):

        self._h = value

        self.emit('change')

    def __getitem__(self, key):

        try:

            tupl = (self.w, self.h)

            return tupl[key]

        except TypeError:

            pass

        return self.__dict__[key]

    def __setitem__(self, key, value):

        if key in [0, 'w']:

            self.w = value

        if key in [1, 'h']:

            self.h = value

    def __repr__(self):

        return 'Size(w={0._w},h={0._h})'.format(self)

    def update(self, w=None, h=None):

        old_w, old_h = self._w, self._h

        if isinstance(w, Size) and h is None:

            self._w, self._h = w

        else:

            if isinstance(w, int):

                self._w = w

            elif w is not None:

                raise ValueError('Size.update(): first parameter must be int or Size')

            if isinstance(h, int):

                self._h = h

            elif h is not None:

                raise ValueError('Size.update(): second parameter must be int')

        if self._w != old_w or self._h != old_h:

            self.emit('change')

class Rect:

    '''Rectangle is defined by 2D coordinates and size.'''

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

        self.x = x

        self.y = y

        self.w = w

        self.h = h

    def __repr__(self):

        return 'Rect(x={0.x},y={0.y},w={0.w},h={0.h})'.format(self)

class Borders:

    '''Borders are defined by left, top, right, bottom border size.

    Ordering is clock-wise, starting with left. This may seem weird,

    but it corresponds to X/Y or W/H used elsewhere. Left and right are

    on X axis, so they are defined first.

    '''

    def __init__(self, l=0, t=0, r=0, b=0, full=None):

        self.l = l # left

        self.t = t # top

        self.r = r # right

        self.b = b # bottom

        if full is not None:

            self.l = self.t = self.r = self.b = full

    def __getitem__(self, key):

        try:

            tupl = (self.l, self.t, self.r, self.b)

            return tupl[key]

        except TypeError:

            pass

        return self.__dict__[key]

    def __repr__(self):

        return 'Borders(l={0.l},t={0.t},r={0.r},b={0.b})'.format(self)

    def update(self, *args, **kwargs):

        if len(args) == 4:

            self.l, self.t, self.r, self.b = args

        elif len(args) == 1 and isinstance(args[0], Borders):

            self.l, self.t, self.r, self.b = args[0]

        elif len(args):

            raise ValueError('Borders.update() takes exactly 4 positional arguments.')

        for arg in kwargs:

            setattr(self, arg, kwargs[arg])

class ClipStack:

    '''Stack of clipping regions.'''

    def __init__(self):

        self.stack = []

    def push(self, x, y, w, h):

        newclip = Rect(x, y, w, h)

        if len(self.stack):

            oldclip = self.top()

            newclip = self.intersect(oldclip, newclip)

        self.stack.append(newclip)

    def pop(self):

        self.stack.pop()

    def top(self):

        return self.stack[-1]

    def test(self, x, y):

        # no clip rectangle on stack => passed

        if not len(self.stack):

            return True

        # test against top clip rect from stack

        clip = self.top()

        if x < clip.x or y < clip.y \

        or x >= clip.x + clip.w or y >= clip.y + clip.h:

            return False

        # passed

        return True

    def intersect(self, r1, r2):

        x1 = max(r1.x, r2.x)

        y1 = max(r1.y, r2.y)

        x2 = min(r1.x + r1.w, r2.x + r2.w)

        y2 = min(r1.y + r1.h, r2.y + r2.h)

        if x1 >= x2 or y1 >= y2:

            return Rect()

        return Rect(x1, y1, x2-x1, y2-y1)

    def union(self, r1, r2):

        x = min(r1.x, r2.x)

        y = min(r1.y, r2.y)

        w = max(r1.x + r1.w, r2.x + r2.w) - x

        h = max(r1.y + r1.h, r2.y + r2.h) - y

        return Rect(x, y, w, h)

class UnicodeGraphics:

    '''Unicode graphics bank.

    This class can be overriden to change graphics style (round corners etc.).'''

    # http://en.wikipedia.org/wiki/List_of_Unicode_characters#Geometric_shapes

    UP_ARROW = '▲' #curses.ACS_UARROW

    DOWN_ARROW = '▼' #curses.ACS_DARROW

    LEFT_ARROW = '◀'

    RIGHT_ARROW = '▶'

    CIRCLE = '●'

    DIAMOND = '◆'

    MIDDLE_DOT = '·'

    # http://en.wikipedia.org/wiki/Box-drawing_characters

    LIGHT_SHADE = '░' #curses.ACS_BOARD

    MEDIUM_SHADE = '▒'

    DARK_SHADE = '▓'

    BLOCK = '█'

    COLUMN = '▁▂▃▄▅▆▇█'

    CORNER_ROUND = '╭╮╰╯'

    CORNER = '┌┐└┘'

    LINE = '─━│┃┄┅┆┇┈┉┊┋'

    HLINE = '─' # curses.ACS_HLINE

    VLINE = '│' # curses.ACS_VLINE

    ULCORNER = '┌' # curses.ACS_ULCORNER

    URCORNER = '┐' # curses.ACS_URCORNER

    LLCORNER = '└' # curses.ACS_LLCORNER

    LRCORNER = '┘' # curses.ACS_LRCORNER

    LTEE = '├'

    RTEE = '┤'

    char_map = {

        # scrollbar

        'sb_thumb'  : CIRCLE,

        'sb_htrack' : LINE[8],

        'sb_vtrack' : LINE[10],

        'sb_left'   : LEFT_ARROW,

        'sb_right'  : RIGHT_ARROW,

        'sb_up'     : UP_ARROW,

        'sb_down'   : DOWN_ARROW,

    }

    def get_char(self, name):

        return self.char_map[name]