summarize_time.cgi


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#!/usr/bin/perl -wT
# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# Contributor(s): Christian Reis <kiko@async.com.br>
#                 Shane H. W. Travis <travis@sedsystems.ca>
#
use strict;

use lib qw(.);

use Date::Parse;         # strptime
use Date::Format;        # strftime

use Bugzilla;
use Bugzilla::Constants; # LOGIN_*
use Bugzilla::Bug;       # EmitDependList
use Bugzilla::Util;      # trim
use Bugzilla::Error;
use Bugzilla::User;      # Bugzilla->user->in_group

my $template = Bugzilla->template;
my $vars = {};

#
# Date handling
#

sub date_adjust_down {
   
    my ($year, $month, $day) = @_;

    if ($day == 0) {
        $month -= 1;
        $day = 31;
        # Proper day adjustment is done later.

        if ($month == 0) {
            $year -= 1;
            $month = 12;
        }
    }

    if (($month == 2) && ($day > 28)) {
        if ($year % 4 == 0 && $year % 100 != 0) {
            $day = 29;
        } else {
            $day = 28;
        }
    }

    if (($month == 4 || $month == 6 || $month == 9 || $month == 11) &&
        ($day == 31) ) 
    {
        $day = 30;
    }
    return ($year, $month, $day);
}

sub date_adjust_up {
    my ($year, $month, $day) = @_;

    if ($day > 31) {
        $month += 1;
        $day    = 1;

        if ($month == 13) {
            $month = 1;
            $year += 1;
        }
    }

    if ($month == 2 && $day > 28) {
        if ($year % 4 != 0 || $year % 100 == 0 || $day > 29) {
            $month = 3;
            $day = 1;
        }
    }

    if (($month == 4 || $month == 6 || $month == 9 || $month == 11) &&
        ($day == 31) )
    {
        $month += 1; 
        $day    = 1;
    }

    return ($year, $month, $day);
}

sub check_dates {
    my ($start_date, $end_date) = @_;
    if ($start_date) {
        if (!str2time($start_date)) {
            ThrowUserError("illegal_date", {'date' => $start_date});
        }
        # This code may strike you as funny. It's actually a workaround
        # for an "issue" in str2time. If you enter the date 2004-06-31,
        # even though it's a bogus date (there *are* only 30 days in
        # June), it will parse and return 2004-07-01. To make this
        # less painful to the end-user, I do the "normalization" here,
        # but it might be "surprising" and warrant a warning in the end.
        $start_date = time2str("%Y-%m-%d", str2time($start_date));
    } 
    if ($end_date) {
        if (!str2time($end_date)) {
            ThrowUserError("illegal_date", {'date' => $end_date});
        }
        # see related comment above.
        $end_date = time2str("%Y-%m-%d", str2time($end_date));
    }
    return ($start_date, $end_date);
}

sub split_by_month {
    # Takes start and end dates and splits them into a list of
    # monthly-spaced 2-lists of dates.
    my ($start_date, $end_date) = @_;

    # We assume at this point that the dates are provided and sane
    my (undef, undef, undef, $sd, $sm, $sy, undef) = strptime($start_date);
    my (undef, undef, undef, $ed, $em, $ey, undef) = strptime($end_date);

    # Find out how many months fit between the two dates so we know
    # how many times we loop.
    my $yd = $ey - $sy;
    my $md = 12 * $yd + $em - $sm;
    # If the end day is smaller than the start day, last interval is not a whole month.
    if ($sd > $ed) {
        $md -= 1;
    }

    my (@months, $sub_start, $sub_end);
    # This +1 and +1900 are a result of strptime's bizarre semantics
    my $year = $sy + 1900;
    my $month = $sm + 1;

    # Keep the original date, when the date will be changed in the adjust_date.
    my $sd_tmp = $sd;
    my $month_tmp = $month;
    my $year_tmp = $year;

    # This section handles only the whole months.
    for (my $i=0; $i < $md; $i++) {
        # Start of interval is adjusted up: 31.2. -> 1.3.
        ($year_tmp, $month_tmp, $sd_tmp) = date_adjust_up($year, $month, $sd);
        $sub_start = sprintf("%04d-%02d-%02d", $year_tmp, $month_tmp, $sd_tmp); 
        $month += 1;
        if ($month == 13) {
            $month = 1;
            $year += 1;
        }
        # End of interval is adjusted down: 31.2 -> 28.2.
        ($year_tmp, $month_tmp, $sd_tmp) = date_adjust_down($year, $month, $sd - 1);
        $sub_end = sprintf("%04d-%02d-%02d", $year_tmp, $month_tmp, $sd_tmp);
        push @months, [$sub_start, $sub_end];
    }