#!/usr/bin/python
# Copyright (c) 2007 Heikki Hokkanen <hoxu@users.sf.net>
# GPLv2
import commands
import datetime
import os
import re
import sys

def getoutput(cmd):
	print '>> %s' % cmd
	output = commands.getoutput(cmd)
	return output

def getkeyssortedbyvalues(dict):
	return map(lambda el : el[1], sorted(map(lambda el : (el[1], el[0]), dict.items())))

class DataCollector:
	def __init__(self):
		pass
	
	##
	# This should be the main function to extract data from the repository.
	def collect(self, dir):
		self.dir = dir
	
	##
	# : get a dictionary of author
	def getAuthorInfo(self, author):
		return None
	
	def getActivityByDayOfWeek(self):
		return {}

	def getActivityByHourOfDay(self):
		return {}

	##
	# Get a list of authors
	def getAuthors(self):
		return []
	
	def getFirstCommitDate(self):
		return datetime.datetime.now()
	
	def getLastCommitDate(self):
		return datetime.datetime.now()
	
	def getTags(self):
		return []
	
	def getTotalAuthors(self):
		return -1
	
	def getTotalCommits(self):
		return -1
		
	def getTotalFiles(self):
		return -1
	
	def getTotalLOC(self):
		return -1

class GitDataCollector(DataCollector):
	def collect(self, dir):
		DataCollector.collect(self, dir)

		self.total_authors = int(getoutput('git-log |git-shortlog -s |wc -l'))
		self.total_commits = int(getoutput('git-rev-list HEAD |wc -l'))
		self.total_files = int(getoutput('git-ls-files |wc -l'))
		self.total_lines = int(getoutput('git-ls-files |xargs cat |wc -l'))

		self.activity_by_hour_of_day = {} # hour -> commits
		self.activity_by_day_of_week = {} # day -> commits

		# activity
		lines = getoutput('git-rev-list HEAD --pretty=format:%at |grep -v ^commit').split('\n')
		for stamp in lines:
			date = datetime.datetime.fromtimestamp(float(stamp))

			# hour
			hour = date.hour
			if hour in self.activity_by_hour_of_day:
				self.activity_by_hour_of_day[hour] += 1
			else:
				self.activity_by_hour_of_day[hour] = 1

			# day
			day = date.weekday()
			if day in self.activity_by_day_of_week:
				self.activity_by_day_of_week[day] += 1
			else:
				self.activity_by_day_of_week[day] = 1

		# TODO author of the month
		self.author_of_month = {} # month -> author -> commits
		self.author_of_year = {} # year -> author -> commits
		self.commits_by_month = {} # month -> commits
		self.first_commit_stamp = 0
		self.last_commit_stamp = 0

		lines = getoutput('git-rev-list --pretty=format:"%at %an" HEAD |grep -v ^commit').split('\n')
		for line in lines:
			parts = line.split(' ')
			stamp = int(parts[0])
			author = ' '.join(parts[1:])

			if self.last_commit_stamp == 0:
				self.last_commit_stamp = stamp
			self.first_commit_stamp = stamp

			yymm = datetime.datetime.fromtimestamp(stamp).strftime('%Y-%m')
			if yymm in self.author_of_month:
				if author in self.author_of_month[yymm]:
					self.author_of_month[yymm][author] += 1
				else:
					self.author_of_month[yymm][author] = 1
			else:
				self.author_of_month[yymm] = {}
				self.author_of_month[yymm][author] = 1
			if yymm in self.commits_by_month:
				self.commits_by_month[yymm] += 1
			else:
				self.commits_by_month[yymm] = 1

			yy = datetime.datetime.fromtimestamp(stamp).year
			if yy in self.author_of_year:
				if author in self.author_of_year[yy]:
					self.author_of_year[yy][author] += 1
				else:
					self.author_of_year[yy][author] = 1
			else:
				self.author_of_year[yy] = {}
				self.author_of_year[yy][author] = 1
	
	def getActivityByDayOfWeek(self):
		return self.activity_by_day_of_week

	def getActivityByHourOfDay(self):
		return self.activity_by_hour_of_day

	def getAuthorInfo(self, author):
		commits = int(getoutput('git-rev-list HEAD --author="%s" |wc -l' % author))
		commits_frac = (100 * float(commits)) / self.getTotalCommits()
		date_first = '0000-00-00'
		date_last = '0000-00-00'
		rev_last = getoutput('git-rev-list --all --author="%s" -n 1' % author)
		rev_first = getoutput('git-rev-list --all --author="%s" |tail -n 1' % author)
		date_first = self.revToDate(rev_first)
		date_last = self.revToDate(rev_last)

		res = { 'commits': commits, 'commits_frac': commits_frac, 'date_first': date_first, 'date_last': date_last }
		return res
	
	def getAuthors(self):
		lines = getoutput('git-rev-list --all --pretty=format:%an |grep -v ^commit |sort |uniq')
		return lines.split('\n')
	
	def getFirstCommitDate(self):
		return datetime.datetime.fromtimestamp(self.first_commit_stamp)
	
	def getLastCommitDate(self):
		return datetime.datetime.fromtimestamp(self.last_commit_stamp)
	
	def getTags(self):
		lines = getoutput('git-show-ref --tags |cut -d/ -f3')
		return lines.split('\n')
	
	def getTagDate(self, tag):
		return self.revToDate('tags/' + tag)
	
	def getTotalAuthors(self):
		return self.total_authors
	
	def getTotalCommits(self):
		return self.total_commits

	def getTotalFiles(self):
		return self.total_files
	
	def getTotalLOC(self):
		return self.total_lines
	
	def revToDate(self, rev):
		stamp = int(getoutput('git-log --pretty=format:%%at "%s" -n 1' % rev))
		return datetime.datetime.fromtimestamp(stamp).strftime('%Y-%m-%d')

class ReportCreator:
	def __init__(self):
		pass
	
	def create(self, data, path):
		self.data = data
		self.path = path

class HTMLReportCreator(ReportCreator):
	def create(self, data, path):
		ReportCreator.create(self, data, path)

		f = open(path + "/index.html", 'w')
		format = '%Y-%m-%d %H:%m:%S'
		self.printHeader(f)

		f.write('<h1>StatGit</h1>')

		f.write('<dl>');
		f.write('<dt>Generated</dt><dd>%s</dd>' % datetime.datetime.now().strftime(format));
		f.write('<dt>Report Period</dt><dd>%s to %s</dd>' % (data.getFirstCommitDate().strftime(format), data.getLastCommitDate().strftime(format)))
		f.write('<dt>Total Files</dt><dd>%s</dd>' % data.getTotalFiles())
		f.write('<dt>Total Lines of Code</dt><dd>%s</dd>' % data.getTotalLOC())
		f.write('<dt>Total Commits</dt><dd>%s</dd>' % data.getTotalCommits())
		f.write('<dt>Authors</dt><dd>%s</dd>' % data.getTotalAuthors())
		f.write('</dl>');

		f.write("""<ul>
<li><a href="activity.html">Activity</a></li>
<li><a href="authors.html">Authors</a></li>
<li><a href="files.html">Files</a></li>
<li><a href="lines.html">Lines</a></li>
</ul>
""")

		f.write('<h2>Tags</h2>')
		f.write('<table>')
		f.write('<tr><th>Name</th><th>Date</th><th>Developers</th></tr>')
		for tag in data.getTags():
			f.write('<tr><td>%s</td><td></td></tr>' % tag)
		f.write('</table>')

		f.write('</body>\n</html>');
		f.close()

		# activity.html
		f = open(path + '/activity.html', 'w')
		self.printHeader(f)
		f.write('<h1>Activity</h1>')

		f.write('<h2>Last 30 days</h2>')

		f.write('<h2>Last 12 months</h2>')

		f.write('\n<h2>Hour of Day</h2>\n\n')
		hour_of_day = data.getActivityByHourOfDay()
		f.write('<table><tr><th>Hour</th>')
		for i in range(1, 25):
			f.write('<th>%d</th>' % i)
		f.write('</tr>\n<tr><th>Commits</th>')
		for i in range(0, 24):
			if i in hour_of_day:
				f.write('<td>%d</td>' % hour_of_day[i])
			else:
				f.write('<td>0</td>')
		f.write('</tr>\n<tr><th>%</th>')
		totalcommits = data.getTotalCommits()
		for i in range(0, 24):
			if i in hour_of_day:
				f.write('<td>%.2f</td>' % ((100.0 * hour_of_day[i]) / totalcommits))
			else:
				f.write('<td>0.00</td>')
		f.write('</tr></table>')

		### Day of Week
		# TODO show also by hour of weekday?
		f.write('\n<h2>Day of Week</h2>\n\n')
		day_of_week = data.getActivityByDayOfWeek()
		f.write('<table>')
		f.write('<tr><th>Day</th><th>Total (%)</th></tr>')
		for d in range(0, 7):
			f.write('<tr>')
			f.write('<th>%d</th>' % (d + 1))
			if d in day_of_week:
				f.write('<td>%d (%.2f%%)</td>' % (day_of_week[d], (100.0 * day_of_week[d]) / totalcommits))
			else:
				f.write('<td>0</td>')
			f.write('</tr>')
		f.write('</table>')

		f.close()

		# authors.html
		f = open(path + '/authors.html', 'w')
		self.printHeader(f)

		f.write('<h1>Authors</h1>')

		f.write('\n<h2>List of authors</h2>\n\n')

		f.write('<table class="authors">')
		f.write('<tr><th>Author</th><th>Commits (%)</th><th>First commit</th><th>Last commit</th></tr>')
		for author in data.getAuthors():
			info = data.getAuthorInfo(author)
			f.write('<tr><td>%s</td><td>%d (%.2f%%)</td><td>%s</td><td>%s</td></tr>' % (author, info['commits'], info['commits_frac'], info['date_first'], info['date_last']))
		f.write('</table>')

		f.write('\n<h2>Author of Month</h2>\n\n')
		f.write('<table>')
		f.write('<tr><th>Month</th><th>Author</th><th>Commits (%)</th></tr>')
		for yymm in reversed(sorted(data.author_of_month.keys())):
			authordict = data.author_of_month[yymm]
			authors = getkeyssortedbyvalues(authordict)
			authors.reverse()
			commits = data.author_of_month[yymm][authors[0]]
			f.write('<tr><td>%s</td><td>%s</td><td>%d (%.2f%% of %d)</td></tr>' % (yymm, authors[0], commits, (100 * commits) / data.commits_by_month[yymm], data.commits_by_month[yymm]))

		f.write('</table>')

		f.write('\n<h2>Author of Year</h2>\n\n')
		f.write('<table><tr><th>Year</th><th>Author</th><th>Commits (%)</th></tr>')
		for yy in reversed(sorted(data.author_of_year.keys())):
			authordict = data.author_of_year[yy]
			authors = getkeyssortedbyvalues(authordict)
			authors.reverse()
			commits = data.author_of_year[yy][authors[0]]
			f.write('<tr><td>%s</td><td>%s</td><td>%d</td></tr>' % (yy, authors[0], commits))
		f.write('</table>')

		f.write('</body></html>')
		f.close()
	pass

	def printHeader(self, f):
		f.write("""<html>
<head>
	<title>StatGit</title>
	<link rel="stylesheet" href="statgit.css" type="text/css" />
</head>
<body>
""")
		

usage = """
Usage: statgit [options] <gitpath> <outputpath>

Options:
  -o html
"""

if len(sys.argv) <  3:
	print usage
	sys.exit(0)

gitpath = sys.argv[1]
outputpath = sys.argv[2]

print 'Git path: %s' % gitpath
print 'Output path: %s' % outputpath

os.chdir(gitpath)

print 'Collecting data...'
data = GitDataCollector()
data.collect(gitpath)

print 'Generating report...'
report = HTMLReportCreator()
report.create(data, outputpath)