#!/usr/bin/env python
#
# Copyright (c) 2011 The Novice Oof
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#------------------------------------------------------------------------------
#

import math
from gimpfu import *
import os

def python_facebook_tag_banner(timg, tdrawable, hsize, format):
    #def some utility functions
    def selectNone(image):
        pdb.gimp_selection_none(image)
    def selectRect(image,x,y,xsize,ysize):
        #... op, feather, radius
        pdb.gimp_rect_select(image,x,y,xsize,ysize,0,False,0)
    def copyRect(layer,x,y,xsize,ysize):
        srcimg = layer.image
        selectNone(srcimg)
        selectRect(srcimg,x,y,xsize,ysize)
        pdb.gimp_edit_copy(layer)

    srcimg = tdrawable.image
    width = srcimg.width
    height = srcimg.height

    #checking the source image is saved somewhere
    if srcimg.filename == None:
        gimp.message("Source image not saved anywhere, cowardly refusing to save images anywhere")
        return False

    # verify the dimensions of the 
    if not(abs(width/float(height)-7.2)<0.1):
        print width,height
        gimp.message("Need an image with an aspect ratio of 7.2, instead of "+str(width/float(height)))
        return False 
    dw = int(round(width/5.0))
    image_size = (hsize,int(400/527.*hsize)) # how big the final image is
    scale_factor =(int(hsize*400/527.),int(hsize*278/527.)) #how big to scale the usable area

    # dupe the image
    workimg = srcimg.duplicate()
    selectNone(workimg)
    # flatten or merge?
    flat_layer = workimg.flatten()
    #flat_layer = pdb.gimp_image_merge_visible_layers(workimg,0)

    for i in range(5):
        # set up a working image
        img = gimp.Image(image_size[0],image_size[1],RGB)
        copyRect(flat_layer,i*dw,0,dw,height)

        # create new layer
        layer = gimp.Layer(img, "Copy1", image_size[0], image_size[1], 
                           RGBA_IMAGE, 100, NORMAL_MODE) #100 for opacity
        img.add_layer(layer,0)
        pdb.gimp_edit_fill(layer, BACKGROUND_FILL)

        # grab the relevant part of the image
        paste = pdb.gimp_edit_paste(layer,False)
        paste.scale(scale_factor[0],scale_factor[1])
        pdb.gimp_layer_set_offsets(paste,0,0)
        pdb.gimp_floating_sel_anchor(paste)

        # save the image
        f = os.path.splitext(srcimg.filename)[0]+str(i+1)+"."+format
        if format=="png":
            pdb.file_png_save_defaults(img,layer,f,f)
        if format=="jpg":
            # using jpeg defaults, Ubuntu 10.10
            pdb.file_jpeg_save(img,layer,f,f,0.9,0.0,1,0,"Made with Facebook Tag Banner Generator by The Novice Oof",0,0,0,0)
        # clean up
        img.clean_all()
        gimp.delete(img)
    
    #clean up
    workimg.clean_all()
    gimp.delete(workimg)

#------------------------------------------

register(
        "python_fu_facebook_tag_banner",
        "Generates a series of images suitable for tag banners on facebook from one ~7.2 aspect ratio image, saved as a series of pngs",
        "In: A 7.2 aspect ratio'd image. Out: A series of images ready to upload",
        "thenoviceoof",
        "thenoviceoof",
        "2011/1",
        "<Image>/Filters/Web/F_acebook Tag Banner...",
        "RGB*, GRAY*",
        [
        (PF_SLIDER,"hsize","Output Image Width (in px, total)",360,(200,500,20)),
        (PF_RADIO,"format","File Format","png",(("_png","png"),
                                                ("_jpg","jpg"))),
        ],
        [],
        python_facebook_tag_banner)

main()