##############################################################################
#
# Copyright (c) 2005-2006 TINY SPRL. (http://tiny.be) All Rights Reserved.
#
# $Id: gantt_report.py 1005 2005-07-25 08:41:42Z nicoe $
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsability of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# garantees and support are strongly adviced to contract a Free Software
# Service Company
#
# 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.
#
# This program 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.
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# You should have received a copy of the GNU General Public License
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
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##############################################################################


from mx import DateTime
import time

def compute_burndown(cr, uid, tasks_id, date_start, date_stop):
	latest = False
	cr.execute('select id,create_date,state,planned_hours from project_task where id in ('+','.join(map(str,tasks_id))+') order by create_date')
	tasks = cr.fetchall()

	cr.execute('select w.date,w.hours from project_task_work w left join project_task t on (t.id=w.task_id) where t.id in ('+','.join(map(str,tasks_id))+') and t.state in (\'open\',\'progress\') order by date')

	tasks2 = cr.fetchall()

	cr.execute('select date_close,planned_hours from project_task where id in ('+','.join(map(str,tasks_id))+') and state in (\'cancelled\',\'done\') order by date_close')
	tasks2 += cr.fetchall()
	tasks2.sort()

	current_date = date_start
	total = 0
	done = 0
	result = []
	while current_date<=date_stop:
		while len(tasks) and tasks[0][1] and tasks[0][1][:10]<=current_date:
			latest = tasks.pop(0)
			total += latest[3]
		i = 0
		while i<len(tasks2):
			if tasks2[i][0][:10]<=current_date:
				t = tasks2.pop(i)
				done += t[1]
			else:
				i+=1
		result.append( (int(time.mktime(time.strptime(current_date,'%Y-%m-%d'))), total-done) )
		current_date = (DateTime.strptime(current_date, '%Y-%m-%d') + DateTime.RelativeDateTime(days=1)).strftime('%Y-%m-%d')
		if not len(tasks) and not len(tasks2):
			break
	result.append( (int(time.mktime(time.strptime(date_stop,'%Y-%m-%d'))), 0) )
	return result


