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

'''Tuikit driver base.'''

from tuikit.common import Size, ClipStack, UnicodeGraphics

class Driver:

    '''Abstract driver interface. Use as base for drivers.'''

    def __init__(self):

        '''Initialize instance attributes.'''

        #: Screen size.

        self.size = Size()

        #: Clipping region stack.

        self.clipstack = ClipStack()

        #: Unicode graphics characters.

        self.unigraph = UnicodeGraphics()

        #: Stack of color prefixes.

        self.colorprefix = []

    ## drawing ##

    def puts(self, x, y, s):

        '''Output string of characters.'''

        for c in s:

            self.putch(x, y, c)

            x += 1

    def hline(self, x, y, w, c=' '):

        '''Draw horizontal line.'''

        if isinstance(c, str):

            s = c*w

        else:

            s = [c]*w

        self.puts(x, y, s)

    def vline(self, x, y, h, c=' '):

        '''Draw vertical line.'''

        for i in range(h):

            self.putch(x, y+i, c)

    def fill(self, x, y, w, h, c=' '):

        '''Fill rectangular area.'''

        for i in range(h):

            self.hline(x, y + i, w, c)

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

        '''Draw rectangular frame using line-drawing characters.'''

        self.putch(x, y, self.unigraph.ULCORNER)

        self.putch(x+w-1, y, self.unigraph.URCORNER)

        self.putch(x, y+h-1, self.unigraph.LLCORNER)

        self.putch(x+w-1, y+h-1, self.unigraph.LRCORNER)

        self.hline(x+1, y, w-2, self.unigraph.HLINE)

        self.hline(x+1, y+h-1, w-2, self.unigraph.HLINE)

        self.vline(x, y+1, h-2, self.unigraph.VLINE)

        self.vline(x+w-1, y+1, h-2, self.unigraph.VLINE)

    ## colors ##

    def pushcolorprefix(self, name):

        self.colorprefix.append(name)

    def popcolorprefix(self):

        self.colorprefix.pop()