[reports][purchase and sales trends]
diff --git a/controllers/trends.py b/controllers/trends.py
new file mode 100644
index 0000000..6c33235
--- /dev/null
+++ b/controllers/trends.py
@@ -0,0 +1,245 @@
+# ERPNext - web based ERP (http://erpnext.com)
+# Copyright (C) 2012 Web Notes Technologies Pvt Ltd
+# 
+# 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 3 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.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from __future__ import unicode_literals
+import webnotes
+from webnotes.utils import cint, add_days, add_months, cstr
+
+def get_columns(filters, year_start_date, start_month, trans):
+	columns, pwc, bon, grbc = [], [], [], []
+	query_bon, query_pwc = '', ''
+
+	period = filters.get("period")
+	based_on = filters.get("based_on")
+	grby = filters.get("group_by")
+
+	if not (period and based_on):
+		webnotes.msgprint("Value missing in 'Period' or 'Based On'", raise_exception=1)
+
+	elif based_on == grby:
+		webnotes.msgprint("Plese select different values in 'Based On' and 'Group By'", raise_exception=1)
+
+	else: 
+		bon, query_bon, basedon, sup_tab = bon_columns_qdata(based_on, bon, trans)
+		pwc, query_pwc = pw_column_qdata(filters, period, pwc, year_start_date,start_month, trans)
+		grbc = grp_column(grby)
+	
+	if grbc:	
+		columns = bon + grbc + pwc +["TOTAL(Qty):Float:120", "TOTAL(Amt):Currency:120"] 
+	else:
+		columns = bon + pwc + ["TOTAL(Qty):Float:120", "TOTAL(Amt):Currency:120"]
+
+	return columns, query_bon, query_pwc, basedon, grbc, sup_tab
+
+def get_data(columns, filters, tab,  query_bon, query_pwc, basedon, grbc, sup_tab):
+	
+	query_details =  query_bon + query_pwc + 'SUM(t2.qty), SUM(t1.grand_total) '
+	query_pwc = query_pwc + 'SUM(t2.qty), SUM(t1.grand_total)'
+	data = []
+	inc, cond= '',''
+	
+	if query_bon in ["t1.project_name,", "t2.project_name,"]:
+		cond = 'and '+ query_bon[:-1] +' IS Not NULL'
+
+	if filters.get("group_by"):
+		sel_col = ''
+
+		if filters.get("group_by") == 'Item':
+			sel_col = 't2.item_code'
+
+		elif filters.get("group_by") == 'Customer':
+			sel_col = 't1.customer'
+
+		elif filters.get("group_by") == 'Supplier':
+			sel_col = 't1.supplier'
+
+		if filters.get('based_on') in ['Item','Customer','Supplier']:
+			inc = 2
+		else :
+			inc = 1
+
+		ind = columns.index(grbc[0])
+
+		data1 = webnotes.conn.sql(""" select %s %s from `%s` t1, `%s` t2 %s
+			where t2.parent = t1.name and t1.company = '%s' and t1.fiscal_year = '%s' 
+			and t1.docstatus = 1 %s group by %s 
+		"""%(query_bon, query_pwc, tab[0], tab[1], sup_tab,filters.get("company"), filters.get("fiscal_year"), 
+		cond, basedon), as_list=1)
+
+		for d in range(len(data1)):
+			#to add blanck column
+			dt = data1[d]
+			dt.insert(ind,'')  
+			data.append(dt)
+
+			#to get distinct value of col specified by group_by in filter
+			row = webnotes.conn.sql("""select DISTINCT(%s) from `%s` t1, `%s` t2
+				where t2.parent = t1.name and t1.company = '%s'	and t1.fiscal_year = '%s' 
+				and t1.docstatus = 1 and %s = '%s' 
+			"""%(sel_col, tab[0], tab[1], filters.get("company"), filters.get("fiscal_year"), 
+			basedon, data1[d][0]),as_list=1)
+			
+			for i in range(len(row)):
+				des = ['' for q in range(len(columns))]
+				
+				#get data for each group_by filter 
+				row1 = webnotes.conn.sql(""" select %s , %s from `%s` t1, `%s` t2 
+					where t2.parent = t1.name and t1.company = '%s' and t1.fiscal_year = '%s' 
+					and t1.docstatus = 1 and %s = '%s' and %s ='%s' 
+				"""%(sel_col, query_pwc, tab[0], tab[1], filters.get("company"), filters.get("fiscal_year"), 
+				sel_col, row[i][0], basedon, data1[d][0]),as_list=1)
+
+				des[ind] = row[i]
+				for j in range(1,len(columns)-inc):	
+					des[j+inc] = row1[0][j]
+				data.append(des)
+	else:
+
+		data = webnotes.conn.sql(""" select %s from `%s` t1, `%s` t2 %s
+			where t2.parent = t1.name and t1.company = '%s' and t1.fiscal_year = '%s' 
+			and t1.docstatus = 1 %s group by %s	
+		"""%(query_details, tab[0], tab[1], sup_tab, filters.get("company"), 
+		filters.get("fiscal_year"), cond,basedon), as_list=1)
+
+	return data
+
+def pw_column_qdata(filters, period, pwc, year_start_date, start_month, trans):
+	query_details = ''
+	if trans in ['Purchase Receipt', 'Delivery Note', 'Purchase Invoice', 'Sales Invoice']:
+		trans_date = 'posting_date'
+	else:
+		trans_date = 'transaction_date'
+
+	if period == "Monthly":
+		month_name = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec']
+
+		for month in range(start_month-1,len(month_name)):
+			pwc.append(month_name[month]+' (Qty):Float:120')
+			pwc.append(month_name[month]+' (Amt):Currency:120')
+
+			query_details += """
+				Sum(CASE WHEN MONTH(t1.%(trans)s)= %(mon_num)s THEN t2.qty ELSE NULL END),
+				SUM(CASE WHEN MONTH(t1.%(trans)s)= %(mon_num)s THEN t1.grand_total ELSE NULL END),
+			"""%{"trans": trans_date,"mon_num": cstr(month+1)}
+
+		for month in range(0, start_month-1):
+			pwc.append(month_name[month]+' (Qty):Float:120')
+			pwc.append(month_name[month]+' (Amt):Currency:120')
+
+			query_details += """
+				Sum(CASE WHEN MONTH(t1.%(trans)s)= %(mon_num)s THEN t2.qty ELSE NULL END),
+				SUM(CASE WHEN MONTH(t1.%(trans)s)= %(mon_num)s THEN t1.grand_total ELSE NULL END),
+			"""%{"trans": trans_date, "mon_num": cstr(month+1)}
+	
+	elif period == "Quarterly":
+		pwc = ["Q1(qty):Float:120", "Q1(amt):Currency:120", "Q2(qty):Float:120", "Q2(amt):Currency:120", 
+		"Q3(qty):Float:120", "Q3(amt):Currency:120", "Q4(qty):Float:120", "Q4(amt):Currency:120"]
+
+		first_qsd, second_qsd, third_qsd, fourth_qsd = year_start_date, add_months(year_start_date,3), add_months(year_start_date,6), add_months(year_start_date,9)
+		first_qed, second_qed, third_qed, fourth_qed = add_days(add_months(first_qsd,3),-1), add_days(add_months(second_qsd,3),-1), add_days(add_months(third_qsd,3),-1), add_days(add_months(fourth_qsd,3),-1)
+
+		bet_dates = [[first_qsd,first_qed],[second_qsd,second_qed],[third_qsd,third_qed],[fourth_qsd,fourth_qed]] 
+		for d in bet_dates:
+			query_details += """
+				SUM(CASE WHEN t1.%(trans)s BETWEEN '%(sd)s' AND '%(ed)s' THEN t2.qty ELSE NULL END), 
+				SUM(CASE WHEN t1.%(trans)s BETWEEN '%(sd)s' AND '%(ed)s' THEN t1.grand_total ELSE NULL END),
+			"""%{"trans": trans_date, "sd": d[0],"ed": d[1]}
+
+	elif period == "Half-yearly":
+		pwc = ["Fisrt Half(qty):Float:120", "Fisrt Half(amt):Currency:120", "Second Half(qty):Float:120",
+		 	"Second Half(amt):Currency:120"]
+
+		first_half_start = year_start_date
+		first_half_end = add_days(add_months(first_half_start,6),-1)
+		second_half_start = add_days(first_half_end,1)
+		second_half_end = add_days(add_months(second_half_start,6),-1)
+
+		query_details = """ 
+			 	SUM(CASE WHEN t1.%(trans)s BETWEEN '%(fhs)s' AND '%(fhe)s' THEN t2.qty ELSE NULL END),
+			 	SUM(CASE WHEN t1.%(trans)s BETWEEN '%(fhs)s' AND '%(fhe)s' THEN t1.grand_total ELSE NULL END), 
+			 	SUM(CASE WHEN t1.%(trans)s BETWEEN '%(shs)s' AND '%(she)s' THEN t2.qty ELSE NULL END), 
+			 	SUM(CASE WHEN t1.%(trans)s BETWEEN '%(shs)s' AND '%(she)s' THEN t1.grand_total ELSE NULL END),
+			"""%{"trans": trans_date, "fhs": first_half_start, "fhe": first_half_end,"shs": second_half_start, 
+		"she": second_half_end}	 
+	
+	else:
+		pwc = [filters.get("fiscal_year")+"(qty):Float:120", filters.get("fiscal_year")+"(amt):Currency:120"]
+		query_details = " SUM(t2.qty), SUM(t1.grand_total),"
+
+	return pwc, query_details
+
+def bon_columns_qdata(based_on, bon, trans):
+	sup_tab = ''
+
+	if based_on == "Item":
+		bon = ["Item:Link/Item:120", "Item Name:Data:120"]
+		query_details = "t2.item_code, t2.item_name," 
+		basedon = 't2.item_code'
+
+	elif based_on == "Item Group":
+		bon = ["Item Group:Link/Item Group:120"]
+		query_details = "t2.item_group," 
+		basedon = 't2.item_group'
+
+	elif based_on == "Customer":
+		bon = ["Customer:Link/Customer:120", "Territory:Link/Territory:120"]
+		query_details = "t1.customer_name, t1.territory, "
+		basedon = 't1.customer_name'
+
+	elif based_on == "Customer Group":
+		bon = ["Customer Group:Link/Customer Group"]
+		query_details = "t1.customer_group,"
+		basedon = 't1.customer_group'
+	
+	elif based_on == 'Supplier':
+		bon = ["Supplier:Link/Supplier:120", "Supplier Type:Link/Supplier Type:120"]
+		query_details = "t1.supplier, t3.supplier_type,"
+		basedon = 't1.supplier'
+		sup_tab = ',`tabSupplier` t3'
+	
+	elif based_on == 'Supplier Type':
+		bon = ["Supplier Type:Link/Supplier Type:120"]
+		query_details = "t3.supplier_type,"
+		basedon = 't3.supplier_type'
+		sup_tab = ',`tabSupplier` t3'
+
+	elif based_on == "Territory":
+		bon = ["Territory:Link/Territory:120"]
+		query_details = "t1.territory,"
+		basedon = 't1.territory'
+
+	elif based_on == "Project":
+
+		if trans in ['Sales Invoice', 'Delivery Note', 'Sales Order']:
+			bon = ["Project:Link/Project:120"]
+			query_details = "t1.project_name,"
+			basedon = 't1.project_name'
+
+		elif trans in ['Purchase Order', 'Purchase Invoice', 'Purchase Receipt']:
+			bon = ["Project:Link/Project:120"]
+			query_details = "t2.project_name,"
+			basedon = 't2.project_name'
+
+		else:
+			webnotes.msgprint("No Information Available", raise_exception=1)
+
+	return bon, query_details, basedon, sup_tab
+
+def grp_column(group_by):
+	if group_by:
+		return [group_by+":Link/"+group_by+":120"]
+	else:
+		return []
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