# coding: utf-8
#
# Copyright © 2012-2013 Ejwa Software. All rights reserved.
#
# This file is part of gitinspector.
#
# gitinspector 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 3 of the License, or
# (at your option) any later version.
#
# gitinspector is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with gitinspector. If not, see <http://www.gnu.org/licenses/>.

from __future__ import print_function
from outputable import Outputable
from changes import FileDiff
import codecs
import comment
import filtering
import format
import interval
import missing
import multiprocessing
import re
import subprocess
import sys
import terminal
import textwrap
import threading

NUM_THREADS = multiprocessing.cpu_count()

class BlameEntry:
	rows = 0
	comments = 0

__thread_lock__ = threading.BoundedSemaphore(NUM_THREADS)
__blame_lock__ = threading.Lock()

class BlameThread(threading.Thread):
	def __init__(self, blame_string, extension, blames, filename):
		__thread_lock__.acquire() # Lock controlling the number of threads running
		threading.Thread.__init__(self)

		self.blame_string = blame_string
		self.extension = extension
		self.blames = blames
		self.filename = filename

	def run(self):
		git_blame_r = subprocess.Popen(self.blame_string, shell=True, bufsize=1, stdout=subprocess.PIPE).stdout
		is_inside_comment = False

		for j in git_blame_r.readlines():
			j = j.decode("utf-8", "replace")
			if Blame.is_blame_line(j):
				author = Blame.get_author(j)
				content = Blame.get_content(j)
				__blame_lock__.acquire() # Global lock used to protect calls from here...

				if self.blames.get((author, self.filename), None) == None:
					self.blames[(author, self.filename)] = BlameEntry()

				if comment.is_comment(self.extension, content):
					self.blames[(author, self.filename)].comments += 1
				if is_inside_comment:
					if comment.has_comment_end(self.extension, content):
						is_inside_comment = False
					else:
						self.blames[(author, self.filename)].comments += 1
				elif comment.has_comment_begining(self.extension, content):
					is_inside_comment = True

				self.blames[(author, self.filename)].rows += 1
				__blame_lock__.release() # ...to here.

		git_blame_r.close()
		__thread_lock__.release() # Lock controlling the number of threads running

class Blame:
	def __init__(self, hard):
		self.blames = {}
		ls_tree_r = subprocess.Popen("git ls-tree --name-only -r " + interval.get_ref(), shell=True, bufsize=1,
		                             stdout=subprocess.PIPE).stdout
		lines = ls_tree_r.readlines()

		for i, row in enumerate(lines):
			row = codecs.getdecoder("unicode_escape")(row.strip())[0]
			row = row.encode("latin-1", "replace")
			row = row.decode("utf-8", "replace").strip("\"").strip("'").strip()

			if FileDiff.is_valid_extension(row) and not filtering.set_filtered(FileDiff.get_filename(row)):
				if not missing.add(row):
					blame_string = "git blame -w {0} ".format("-C -C -M" if hard else "") + \
					               interval.get_since() + interval.get_ref() + " -- \"" + row + "\""
					thread = BlameThread(blame_string, FileDiff.get_extension(row), self.blames, row.strip())
					thread.daemon = True
					thread.start()

					if hard:
						Blame.output_progress(i, len(lines))

		# Make sure all threads have completed.
		for i in range(0, NUM_THREADS):
			__thread_lock__.acquire()

	@staticmethod
	def output_progress(pos, length):
		if sys.stdout.isatty() and format.is_interactive_format():
			terminal.clear_row()
			print("\bChecking how many rows belong to each author (Progress): {0:.0f}%".format(100 * pos / length), end="")
			sys.stdout.flush()

	@staticmethod
	def is_blame_line(string):
		return string.find(" (") != -1

	@staticmethod
	def get_author(string):
		author = re.search(" \((.*?)\d\d\d\d-\d\d-\d\d", string)
		return re.sub("[^\w ]", "", author.group(1)).strip()

	@staticmethod
	def get_content(string):
		content = re.search(" \d+\)(.*)", string)
		return content.group(1).lstrip()

	def get_summed_blames(self):
		summed_blames = {}
		for i in self.blames.items():
			if summed_blames.get(i[0][0], None) == None:
				summed_blames[i[0][0]] = BlameEntry()

			summed_blames[i[0][0]].rows += i[1].rows
			summed_blames[i[0][0]].comments += i[1].comments

		return summed_blames

__blame__ = None

def get(hard):
	global __blame__
	if __blame__ == None:
		__blame__ = Blame(hard)

	return __blame__

__blame_info_text__ = ("Below are the number of rows from each author that have survived and are still "
                       "intact in the current revision")

class BlameOutput(Outputable):
	def __init__(self, hard):
		self.hard = hard
		Outputable.__init__(self)

	def output_html(self):
		get(self.hard)

		blame_xml = "<div><div class=\"box\">"
		blame_xml += "<p>" + __blame_info_text__ + ".</p><div><table id=\"blame\" class=\"git\">"
		blame_xml += "<thead><tr> <th>Author</th> <th>Rows</th> <th>% in comments</th> </tr></thead>"
		blame_xml += "<tbody>"
		chart_data = ""
		blames = sorted(__blame__.get_summed_blames().items())
		total_blames = 0

		for i in blames:
			total_blames += i[1].rows

		for i, entry in enumerate(blames):
			work_percentage = str("{0:.2f}".format(100.0 * entry[1].rows / total_blames))

			blame_xml += "<tr " + ("class=\"odd\">" if i % 2 == 1 else ">")
			blame_xml += "<td>" + entry[0] + "</td>"
			blame_xml += "<td>" + str(entry[1].rows) + "</td>"
			blame_xml += "<td>" + "{0:.2f}".format(100.0 * entry[1].comments / entry[1].rows) + "</td>"
			blame_xml += "<td style=\"display: none\">" + work_percentage + "</td>"
			blame_xml += "</tr>"
			chart_data += "{{label: \"{0}\", data: {1}}}".format(entry[0], work_percentage)

			if blames[-1] != entry:
				chart_data += ", "

		blame_xml += "<tfoot><tr> <td colspan=\"3\">&nbsp;</td> </tr></tfoot></tbody></table>"
		blame_xml += "<div class=\"chart\" id=\"blame_chart\"></div></div>"
		blame_xml += "<script type=\"text/javascript\">"
		blame_xml += "    $.plot($(\"#blame_chart\"), [{0}], {{".format(chart_data)
		blame_xml += "        series: {"
		blame_xml += "            pie: {"
		blame_xml += "                innerRadius: 0.4,"
		blame_xml += "                show: true,"
		blame_xml += "                combine: {"
		blame_xml += "                    threshold: 0.01,"
		blame_xml += "                    label: \"Minor Authors\""
		blame_xml += "                }"
		blame_xml += "            }"
		blame_xml += "        }"
		blame_xml += "    });"
		blame_xml += "</script></div></div>"

		print(blame_xml)

	def output_text(self):
		print("")
		get(self.hard)

		if self.hard and sys.stdout.isatty():
			terminal.clear_row()

		print(textwrap.fill(__blame_info_text__ + ":", width=terminal.get_size()[0]) + "\n")
		terminal.printb("Author".ljust(21) + "Rows".rjust(10) + "% in comments".rjust(16))
		for i in sorted(__blame__.get_summed_blames().items()):
			print(i[0].ljust(20)[0:20], end=" ")
			print(str(i[1].rows).rjust(10), end=" ")
			print("{0:.2f}".format(100.0 * i[1].comments / i[1].rows).rjust(15))

	def output_xml(self):
		get(self.hard)

		message_xml = "\t\t<message>" + __blame_info_text__ + "</message>\n"
		blame_xml = ""

		for i in sorted(__blame__.get_summed_blames().items()):
			name_xml = "\t\t\t\t<name>" + i[0] + "</name>\n"
			rows_xml = "\t\t\t\t<rows>" + str(i[1].rows) + "</rows>\n"
			percentage_in_comments_xml = ("\t\t\t\t<percentage-in-comments>" + "{0:.2f}".format(100.0 * i[1].comments / i[1].rows) +
			                              "</percentage-in-comments>\n")
			blame_xml += "\t\t\t<author>\n" + name_xml + rows_xml + percentage_in_comments_xml + "\t\t\t</author>\n"

		print("\t<blame>\n" + message_xml + "\t\t<authors>\n" + blame_xml + "\t\t</authors>\n\t</blame>")