#
# Copyright (c) 2008 Sascha Steinbiss <steinbiss@zbh.uni-hamburg.de>
# Copyright (c) 2008 Center for Bioinformatics, University of Hamburg
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#

from gt.dlload import gtlib
from gt.annotationsketch.style import Style
from gt.annotationsketch.image_info import ImageInfo
from gt.core.error import Error, gterror
from gt.core.gtstr import Str

class Canvas:
  def __init__(self, *args):
    raise NotImplementedError, "Please call the constructor of a " \
                               "Canvas implementation."

  def __del__(self):
    try:
      gtlib.gt_canvas_delete(self.canvas)
    except AttributeError:
      pass

  def from_param(cls, obj):
    if not isinstance(obj, Canvas):
      raise TypeError, "argument must be a Canvas"
    return obj._as_parameter_
  from_param = classmethod(from_param)

class CanvasCairoFile(Canvas):
  def __init__(self, *args):
    raise NotImplementedError, "Please call the constructor of a " \
                               "CanvasCairoFile implementation."

  def from_param(cls, obj):
    if not isinstance(obj, CanvasCairoFile):
      raise TypeError, "argument must be a CanvasCairoFile"
    return obj._as_parameter_
  from_param = classmethod(from_param)

  def to_file(self, filename):
    err = Error()
    rval = gtlib.gt_canvas_cairo_file_to_file(self.canvas, filename, err)
    if rval != 0:
      gterror(err)

  def to_stream(self):
    from ctypes import string_at
    str = Str(None)
    gtlib.gt_canvas_cairo_file_to_stream(self.canvas, str)
    return string_at(str.get_mem(), str.length())

  def register(cls, gtlib):
    from ctypes import c_char_p, c_void_p, c_ulong, c_int
    gtlib.gt_canvas_cairo_file_to_file.restype = c_int
    gtlib.gt_canvas_cairo_file_to_file.argtypes = [c_void_p, c_char_p, Error]
    gtlib.gt_canvas_cairo_file_to_stream.restype  = c_char_p
    gtlib.gt_canvas_cairo_file_to_stream.argtypes = [c_void_p, Str]
    gtlib.gt_canvas_cairo_file_new.restype  = c_void_p
    gtlib.gt_canvas_cairo_file_new.argtypes = [Style, c_int, c_ulong, c_ulong, \
                                               ImageInfo]
  register = classmethod(register)

class CanvasCairoFilePDF(CanvasCairoFile):
   def __init__(self, style, width, height, ii = None):
    self.canvas = gtlib.gt_canvas_cairo_file_new(style, 0, width, height, ii)
    self._as_parameter_ = self.canvas

class CanvasCairoFilePNG(CanvasCairoFile):
   def __init__(self, style, width, height, ii = None):
    self.canvas = gtlib.gt_canvas_cairo_file_new(style, 1, width, height, ii)
    self._as_parameter_ = self.canvas

class CanvasCairoFilePS(CanvasCairoFile):
   def __init__(self, style, width, height, ii = None):
    self.canvas = gtlib.gt_canvas_cairo_file_new(style, 2, width, height, ii)
    self._as_parameter_ = self.canvas

class CanvasCairoFileSVG(CanvasCairoFile):
   def __init__(self, style, width, height, ii = None):
    self.canvas = gtlib.gt_canvas_cairo_file_new(style, 3, width, height, ii)
    self._as_parameter_ = self.canvas