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#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
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#  along with this program; if not, write to the Free Software Foundation,
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# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

# classes for extracting info from blenders internal classes

import bpy
import bgl

import sys

def cutPoint(text, length):
	"Returns position of the last space found before 'length' chars"
	l = length
	c = text[l]
	while c != ' ':
		l -= 1
		if l == 0: return length # no space found
		c = text[l]
	return l

def textWrap(text, length = 70):
	lines = []
	while len(text) > 70:
		cpt = cutPoint(text, length)
		line, text = text[:cpt], text[cpt + 1:]
		lines.append(line)
	lines.append(text)
	return lines

def write_sysinfo(op):
	output_filename = "system-info.txt"
	warnings = 0
	notices = 0

	if output_filename in bpy.data.texts.keys():
	    output = bpy.data.texts[output_filename]
	    output.clear()
	else:
	    output = bpy.data.texts.new(name=output_filename)

	header = '= Blender {} System Information =\n'.format(bpy.app.version_string)
	lilies = '{}\n\n'.format(len(header)*'=')
	firstlilies = '{}\n'.format(len(header)*'=')
	output.write(firstlilies)
	output.write(header)
	output.write(lilies)

	# build info
	output.write('\nBlender:\n')
	output.write(lilies)
	output.write('version {}, revision {}. {}\n'.format(bpy.app.version_string, bpy.app.build_revision, bpy.app.build_type))
	output.write('build date: {}, {}\n'.format(bpy.app.build_date, bpy.app.build_time))
	output.write('platform: {}\n'.format(bpy.app.build_platform))
	output.write('binary path: {}\n'.format(bpy.app.binary_path))
	output.write('build cflags: {}\n'.format(bpy.app.build_cflags))
	output.write('build cxxflags: {}\n'.format(bpy.app.build_cxxflags))
	output.write('build linkflags: {}\n'.format(bpy.app.build_linkflags))
	output.write('build system: {}\n'.format(bpy.app.build_system))

	# python info
	output.write('\nPython:\n')
	output.write(lilies)
	output.write('version: {}\n'.format(sys.version))
	output.write('paths:\n')
	for p in sys.path:
	    output.write('\t{}\n'.format(p))

	output.write('\nDirectories:\n')
	output.write(lilies)
	output.write('scripts: {}\n'.format(bpy.utils.script_paths()))
	output.write('user scripts: {}\n'.format(bpy.utils.user_script_path()))
	output.write('datafiles: {}\n'.format(bpy.utils.user_resource('DATAFILES')))
	output.write('config: {}\n'.format(bpy.utils.user_resource('CONFIG')))
	output.write('scripts : {}\n'.format(bpy.utils.user_resource('SCRIPTS')))
	output.write('autosave: {}\n'.format(bpy.utils.user_resource('AUTOSAVE')))
	output.write('tempdir: {}\n'.format(bpy.app.tempdir))

	output.write('\nOpenGL\n')
	output.write(lilies)
	output.write('renderer:\t{}\n'.format(bgl.glGetString(bgl.GL_RENDERER)))
	output.write('vendor:\t\t{}\n'.format(bgl.glGetString(bgl.GL_VENDOR)))
	output.write('version:\t{}\n'.format(bgl.glGetString(bgl.GL_VERSION)))
	output.write('extensions:\n')

	glext = bgl.glGetString(bgl.GL_EXTENSIONS)
	glext = textWrap(glext, 70)
	for l in glext:
	    output.write('\t\t{}\n'.format(l))
	
	op.report({'INFO'}, "System information generated in 'system-info.txt'")