diff --git a/app/controllers/simulation_controller.rb b/app/controllers/simulation_controller.rb
index ee279998c231ec896efd490eb8ed59713c7f2042..d64f70d21af0d9537b68a9d52eaf7b53e17aa429 100644
--- a/app/controllers/simulation_controller.rb
+++ b/app/controllers/simulation_controller.rb
@@ -1,6 +1,92 @@
+# -*- coding: utf-8 -*-
class SimulationController < ApplicationController
def simulate
+ @start_saldos = Saldo.find_by_sql(
+ "SELECT saldos.id, saldos.amount, saldos.date, saldos.account_id FROM" +
+ " (SELECT account_id, MAX(date) AS maxdate" +
+ " FROM saldos GROUP BY account_id) AS maxx, saldos" +
+ " WHERE maxx.account_id = saldos.account_id" +
+ " AND maxx.maxdate = saldos.date" +
+ " ORDER BY id")
+
+ @start_amount = 0
+ @start_date = nil
+ for saldo in @start_saldos
+ @start_amount += saldo.amount
+ if @start_date.nil? or @start_date < saldo.date
+ @start_date = saldo.date
+ end
+ end
+
+ items = RecurringItemRange.find(:all,
+ :conditions => ["enddate > ? OR enddate IS NULL", @start_date],
+ :include => [:recurring_item, :schedule])
+
+ items.each { |item|
+ item.set_simulation_date(@start_date)
+ }
+
+ if false
+ items.sort!
+
+ items.each { |item|
+ puts item.recurring_item.description, item.next_event, item.amount
+ }
+ end
+
+ now = Time.utc(@start_date.year, @start_date.month, @start_date.day)
+ @start_time = now
+
+ if not params[:enddate].nil?
+ @end_time = Time.parse(params[:enddate])
+ else
+ start = Time.utc(@start_date.year, @start_date.month, @start_date.day)
+ @end_time = now.advance(:months => if params[:months].nil?
+ then 3
+ else params[:months].to_i
+ end)
+ end
+
+ @end_date = Date.civil(@end_time.year, @end_time.month, @end_time.day)
+
+ amount = @start_amount
+ @min_amount = amount
+ @max_amount = amount
+
+ @actions = [[time_to_date(now), "Ingående saldo", 0, amount]]
+
+ while now <= @end_time
+ items.sort!
+ i = items[0]
+ if i.next_event.nil?
+ break
+ end
+ change = i.next_amount
+ amount += change
+ entry = [i.next_date, i.recurring_item.description, change, amount]
+ @actions << entry
+
+ if @min_amount > amount
+ @min_amount = amount
+ end
+
+ if @max_amount < amount
+ @max_amount = amount
+ end
+
+ now = i.next_event
+ i.forward
+ end
+
+ end
+
+ def time_to_date(t)
+ Date.civil(t.year, t.month, t.day)
+ end
+
+ def date_to_time(d)
+ Time.utc(d.year, d.month, d.day)
end
end
diff --git a/app/models/recurring_item_range.rb b/app/models/recurring_item_range.rb
index 2861a8dd32ac8318769f63476d4ec4536b9de7d7..71198533acf1ae93cb796617ff848c1bfc3646e6 100644
--- a/app/models/recurring_item_range.rb
+++ b/app/models/recurring_item_range.rb
@@ -1,4 +1,86 @@
class RecurringItemRange < ActiveRecord::Base
belongs_to :schedule
belongs_to :recurring_item
+
+ def set_simulation_date(date)
+ @simulation_date = date
+ @simulation_time = date_to_time(date)
+ if self.spread_out
+ @next_event = date_to_time(date)
+ else
+ @next_event = date_to_time(self.startdate)
+ end
+
+ # FIXME: This can probably be done more efficiently, by finding
+ # out how many months we need to forward.
+ while (not @next_event.nil?) and @next_event < @simulation_time
+ self.forward
+ end
+ end
+
+ def <=>(other)
+ if @next_event.nil? and other.next_event.nil?
+ return 0
+ elsif @next_event.nil?
+ return 1
+ elsif other.next_event.nil?
+ return -1
+ elsif @next_event != other.next_event
+ return @next_event <=> other.next_event
+ else
+ return amount <=> other.amount
+ end
+ end
+
+ def next_event
+ return @next_event
+ end
+
+ def next_amount
+ if self.spread_out
+ this_month = Time.utc(@next_event.year, @next_event.month, 1)
+ next_month = this_month.advance(:months => 1)
+ days_in_month = time_to_date(next_month) - time_to_date(this_month)
+
+ month_amount = self.amount.to_f
+
+ yesterday = ((month_amount * (@next_event.day - 1)) / days_in_month).to_i
+ today = ((month_amount * @next_event.day) / days_in_month).to_i
+
+ return today - yesterday
+ else
+ return self.amount
+ end
+ end
+
+ def time_to_date(t)
+ Date.civil(t.year, t.month, t.day)
+ end
+
+ def date_to_time(d)
+ Time.utc(d.year, d.month, d.day)
+ end
+
+ def next_date
+ time_to_date(@next_event)
+ end
+
+ def forward
+ if not @next_event.nil?
+ if self.spread_out
+ @next_event = @next_event.advance(:days => 1)
+ else
+ @next_event = @next_event.advance(:months =>
+ self.schedule.monthly_repeat)
+ end
+ if not self.enddate.nil? and @next_event > self.endtime
+ @next_event = nil
+ end
+ end
+ end
+
+ def endtime
+ date_to_time(self.enddate)
+ end
+
end
diff --git a/app/views/simulation/simulate.rhtml b/app/views/simulation/simulate.rhtml
index c769da596b22b4f9e0a31908add98da1e7a1d62d..00280f9397eaf2316a7a911f575d4bdcdcbb0c26 100644
--- a/app/views/simulation/simulate.rhtml
+++ b/app/views/simulation/simulate.rhtml
@@ -1,2 +1,40 @@
-<h1>Simulation#simulate</h1>
-<p>Find me in app/views/simulation/simulate.rhtml</p>
+<h1>Simulation result</h1>
+
+<p>Minimum: <%= @min_amount %></p>
+<p>Maximum: <%= @max_amount %></p>
+
+<p>Incoming saldos:</p>
+
+<table border="1">
+ <tr>
+ <th>Date</th>
+ <th>Account name</th>
+ <th>Amount</th>
+ </tr>
+ <% for saldo in @start_saldos %>
+ <tr class="<%= if saldo.amount < 0 then "debet" else "credit" end %>">
+ <td><%=h saldo.date %></td>
+ <td><%=h saldo.account.name %></td>
+ <td class="amount"><%=h saldo.amount %></td>
+ </tr>
+ <% end %>
+</table>
+
+<p>Transactions:</p>
+
+<table border="1">
+ <tr>
+ <th>Date</th>
+ <th>Description</th>
+ <th>Change</th>
+ <th>Total saldo</th>
+ </tr>
+ <% for action in @actions %>
+ <tr class="<%= if action[2] < 0 then "debet" else "credit" end %>">
+ <td><%=h action[0] %></td>
+ <td><%=h action[1] %></td>
+ <td class="amount"><%=h action[2] %></td>
+ <td class="amount"><%=h action[3] %></td>
+ </tr>
+ <% end %>
+</table>
diff --git a/db/migrate/004_create_saldos.rb b/db/migrate/004_create_saldos.rb
index 7354fe3a7d0a454a64d2b2aff5ce34eb97cbfd22..b060e79f705230c9b368716c8685095c29f2b0af 100644
--- a/db/migrate/004_create_saldos.rb
+++ b/db/migrate/004_create_saldos.rb
@@ -19,6 +19,7 @@ class CreateSaldos < ActiveRecord::Migration
date1 = Date.civil(2006, 8, 10)
date2 = Date.civil(2006, 8, 14)
+ date3 = Date.civil(2006, 8, 18)
Saldo.create :amount => 1231, :date => date1, :account_id => ppay
Saldo.create :amount => 4000, :date => date2, :account_id => ppay
@@ -34,6 +35,7 @@ class CreateSaldos < ActiveRecord::Migration
Saldo.create :amount => 23000, :date => date2, :account_id => pfund
Saldo.create :amount => 18000, :date => date1, :account_id => psaved
Saldo.create :amount => 18000, :date => date2, :account_id => psaved
+ Saldo.create :amount => 18020, :date => date3, :account_id => psaved
end
end
diff --git a/db/migrate/005_create_recurring_item_ranges.rb b/db/migrate/005_create_recurring_item_ranges.rb
index 28f6fed23ec1e85fe8eecac596298faf9d1b0721..a24f2ffade66c55c101fc2145ed32ba39cbfb2f9 100644
--- a/db/migrate/005_create_recurring_item_ranges.rb
+++ b/db/migrate/005_create_recurring_item_ranges.rb
@@ -22,7 +22,7 @@ class CreateRecurringItemRanges < ActiveRecord::Migration
RecurringItemRange.create(:recurring_item_id => pay,
:amount => "22200",
- :startdate => Date.civil(2006, 8, 25),
+ :startdate => Date.civil(2006, 2, 25),
:enddate => Date.civil(2006, 10, 24),
:schedule_id => month,
:spread_out => false)
@@ -54,7 +54,7 @@ class CreateRecurringItemRanges < ActiveRecord::Migration
RecurringItemRange.create(:recurring_item_id => food,
:amount => "-4000",
- :startdate => Date.civil(2006, 8, 25),
+ :startdate => Date.civil(2006, 7, 25),
:schedule_id => month,
:spread_out => true)
end
diff --git a/public/index.html b/public/index.html
index 47e0a2f69b7a7e8be6fd0b905517a05085382fd3..0fa900e542eafdc1842b1b1371d79f5ec412e2c1 100644
--- a/public/index.html
+++ b/public/index.html
@@ -277,6 +277,7 @@
<li><a href="saldos">Saldos</a></li>
<li><a href="recurring_items">RecurringItems</a></li>
<li><a href="recurring_item_ranges">RecurringItemRanges</a></li>
+ <li><a href="simulation/simulate">Simulation</a></li>
</ul>
</div>
</div>