#!/usr/bin/env python2

import sys
import psMat
import re
import os.path
import argparse

try:
	#Load the module
	import fontforge

except ImportError:
	sys.stderr.write("FontForge module could not be loaded. Try installing fontforge python bindings\n")
	sys.exit(1)


# argparse stuff

parser = argparse.ArgumentParser(description='Patches a given font with programming and web development related glyphs (mainly for vim-webdevicons)')
parser.add_argument('font', help='The path to the font to be patched (e.g. Inconsolata.otf)')
parser.add_argument('-s', '--use-single-width-glyphs', dest='single', action='store_true', help='Whether to generate the glyphs as single-width not double-width (default is double-width)', default=False)
parser.add_argument('-q', '--quiet', '--shutup', dest='quiet', action='store_true', help='Do not generate verbose output', default=False)
args = parser.parse_args()

#print "using fontforge package version: " + str(fontforge.__version__) + " " + str(fontforge.version())
#print type(fontforge.version())
#print int(fontforge.version())

minimumVersion = 20141231
actualVersion = int(fontforge.version())
#actualVersion = 20120731 # for testing invalid version

if actualVersion < minimumVersion:
    print "You seem to be using an unsupported (old) version of fontforge: " + str(actualVersion)
    print "Please use at least version: " + str(minimumVersion)
    sys.exit(1)

additionalFontNameSuffix = " Plus Nerd File Types"

if args.single:
    additionalFontNameSuffix += " Mono"

sourceFont = fontforge.open(args.font)

# rename font
fontname, style = re.match("^([^-]*)(?:(-.*))?$", sourceFont.fontname).groups()
sourceFont.familyname = sourceFont.familyname + additionalFontNameSuffix
sourceFont.fullname = sourceFont.fullname + additionalFontNameSuffix
sourceFont.fontname = fontname + additionalFontNameSuffix.replace(" ", "")
sourceFont.appendSFNTName('English (US)', 'Preferred Family', sourceFont.familyname)
sourceFont.appendSFNTName('English (US)', 'Compatible Full', sourceFont.fullname)

# glyph font

sourceFont_em_original = sourceFont.em

symbols = fontforge.open("glyph-source-fonts/original-source.otf")
symbols2 = fontforge.open("glyph-source-fonts/devicons.ttf")

symbolsRangeStart = 0xE500
symbolsRangeEnd = 0xE521

symbols2RangeStart = 0xE600
symbols2RangeEnd = 0xE6A4

sourceFontRange1Start = 0xE600
sourceFontRange1End = 0xE621

sourceFontRange2Start = 0xE700
sourceFontRange2End = 0xE7A4

SYM_ATTR = {
	# Right/left-aligned glyphs will have their advance width reduced in order to overlap the next glyph slightly
	0x2b60: { 'align': 'c', 'stretch': 'y' , 'overlap': False },
	0x2b61: { 'align': 'c', 'stretch': ''  , 'overlap': False },
	0x2b62: { 'align': 'r', 'stretch': ''  , 'overlap': False },
	0x2b63: { 'align': 'l', 'stretch': ''  , 'overlap': False },
	0x2b64: { 'align': 'c', 'stretch': ''  , 'overlap': False },
	0x2b80: { 'align': 'l', 'stretch': 'xy', 'overlap': True  },
	0x2b81: { 'align': 'l', 'stretch': 'xy', 'overlap': True  },
	0x2b82: { 'align': 'r', 'stretch': 'xy', 'overlap': True  },
	0x2b83: { 'align': 'r', 'stretch': 'xy', 'overlap': True  },
}


# Force the em size to be equal
symbols.em = sourceFont.em
symbols2.em = sourceFont.em

# Initial font dimensions
font_dim = {
	'xmin'  :    0,
	'ymin'  :    -sourceFont.descent,
	'xmax'  :    0,
	'ymax'  :    sourceFont.ascent,

	'width' :    0,
	'height':    0,
}

# Find the biggest char width and height
#
# 0x00-0x17f is the Latin Extended-A range
# 0x2500-0x2600 is the box drawing range
for glyph in range(0x00, 0x17f) + range(0x2500, 0x2600):
	try:
		(xmin, ymin, xmax, ymax) = sourceFont[glyph].boundingBox()
	except TypeError:
		continue

	if font_dim['width'] == 0:
		font_dim['width'] = sourceFont[glyph].width

	if ymin < font_dim['ymin']: font_dim['ymin'] = ymin
	if ymax > font_dim['ymax']: font_dim['ymax'] = ymax
	if xmax > font_dim['xmax']: font_dim['xmax'] = xmax

# Calculate font height
font_dim['height'] = abs(font_dim['ymin']) + font_dim['ymax']

# Update the font encoding to ensure that the Unicode glyphs are available
sourceFont.encoding = 'ISO10646'

# Fetch this property before adding outlines
onlybitmaps = sourceFont.onlybitmaps

def get_dim(glyph):
	bbox = glyph.boundingBox()

	return  {
		'xmin'  : bbox[0],
		'ymin'  : bbox[1],
		'xmax'  : bbox[2],
		'ymax'  : bbox[3],

		'width' : bbox[2] + (-bbox[0]),
		'height': bbox[3] + (-bbox[1]),
	}

def copy_glyphs(sourceFont, sourceFontStart, sourceFontEnd, symbolFont, symbolFontStart, symbolFontEnd):

    sourceFontList = []
    sourceFontCounter = 0

    for i in xrange(sourceFontStart, sourceFontEnd + 1):
        sourceFontList.append(format(i, 'X'))

    # Create glyphs from symbol font

    symbolFont.selection.select(("ranges","unicode"),symbolFontStart,symbolFontEnd)
    sourceFont.selection.select(("ranges","unicode"),sourceFontStart,sourceFontEnd)

    for sym_glyph in symbolFont.selection.byGlyphs:
            #sym_attr = SYM_ATTR[sym_glyph.unicode]
            if args.quiet == False:
                print "updating glyph: " + str(sym_glyph)
            # convince that this string really is a hex:
            currentSourceFontGlyph = int("0x" + sourceFontList[sourceFontCounter], 16)

            # Prepare symbol glyph dimensions
            sym_dim = get_dim(sym_glyph)

            # Select and copy symbol from its encoding point
            symbolFont.selection.select(sym_glyph.encoding)
            symbolFont.copy()

            # Select and paste symbol to its unicode code point
            sourceFont.selection.select(currentSourceFontGlyph)
            sourceFont.paste()

            if args.single:
                # Now that we have copy/pasted the glyph, it's time to scale and move it

                # Handle glyph stretching
                #if 'x' in sym_attr['stretch']:
                #        # Stretch the glyph horizontally
                #        scale_ratio = font_dim['width'] / sym_dim['width']

                #        sourceFont.transform(psMat.scale(scale_ratio, 1))
                #if 'y' in sym_attr['stretch']:
                #        # Stretch the glyph vertically
                #        scale_ratio = font_dim['height'] / sym_dim['height']

                #        sourceFont.transform(psMat.scale(1, scale_ratio))

                # Use the dimensions from the pasted and stretched glyph
                sym_dim = get_dim(sourceFont[currentSourceFontGlyph])

                # Center-align the glyph vertically
                font_ycenter = font_dim['height'] / 2
                sym_ycenter  = sym_dim['height'] / 2

                # First move it to the ymax (top)
                sourceFont.transform(psMat.translate(0, font_dim['ymax'] - sym_dim['ymax']))

                # Then move it the y center difference
                sourceFont.transform(psMat.translate(0, sym_ycenter - font_ycenter))

                # Ensure that the glyph doesn't extend outside the font's bounding box
                if sym_dim['width'] > font_dim['width']:
                        # The glyph is too wide, scale it down to fit
                        scale_matrix = psMat.scale(font_dim['width'] / sym_dim['width'], 1)

                        sourceFont.transform(scale_matrix)

                        # Use the dimensions from the stretched glyph
                        sym_dim = get_dim(sourceFont[currentSourceFontGlyph])

                # Handle glyph alignment
                #if sym_attr['align'] == 'c':
                #        # Center align
                #        align_matrix = psMat.translate(font_dim['width'] / 2 - sym_dim['width'] / 2 , 0)
                align_matrix = psMat.translate(font_dim['width'] / 2 - sym_dim['width'] / 2 , 0)
                #elif sym_attr['align'] == 'r':
                #        # Right align
                #        align_matrix = psMat.translate(font_dim['width'] - sym_dim['width'], 0)
                #else:
                        # No alignment (left alignment)
                        #align_matrix = psMat.translate(0, 0)

                sourceFont.transform(align_matrix)

                #if sym_attr['overlap'] is True:
                #        overlap_width = sourceFont.em / 48

                #        # Stretch the glyph slightly horizontally if it should overlap
                #        sourceFont.transform(psMat.scale((sym_dim['width'] + overlap_width) / sym_dim['width'], 1))

                #        if sym_attr['align'] == 'l':
                #                # The glyph should be left-aligned, so it must be moved overlap_width to the left
                #                # This only applies to left-aligned glyphs because the glyph is scaled to the right
                #                sourceFont.transform(psMat.translate(-overlap_width, 0))

                # Ensure the font is considered monospaced on Windows
                sourceFont[currentSourceFontGlyph].width = font_dim['width']

            sourceFontCounter += 1
            # reset selection so iteration works propertly @todo fix? rookie misunderstanding?
            symbolFont.selection.select(("ranges","unicode"),symbolFontStart,symbolFontEnd)
    # end for
    return


copy_glyphs(sourceFont, sourceFontRange1Start, sourceFontRange1End, symbols, symbolsRangeStart, symbolsRangeEnd)
copy_glyphs(sourceFont, sourceFontRange2Start, sourceFontRange2End, symbols2, symbols2RangeStart, symbols2RangeEnd)

extension = os.path.splitext(sourceFont.path)[1]

# @todo later add option to generate the sfd?
#sourceFont.save(sourceFont.fullname + ".sfd")

sourceFont.generate(sourceFont.fullname + extension)

print "Generated"
print sourceFont.fullname