#!/usr/bin/perl -w
#
# contributed to beancounter by 
# Joao Antunes Costa <joao.costa /AT/ fidelizarte /DOT/ pt
#
# copyright Joao Antunes Costa <joao.costa /AT/ fidelizarte /DOT/ pt

use strict;
use LWP::Simple;
use HTML::TreeBuilder;
use HTML::FormatText;
use Date::Calc qw (Delta_Days);


my $symbol = shift || die("Usage:\n\tgetDiv symbol\n");
my ($second, $minute, $hour, $day, $month, $year) = localtime(time);
$month++;
$month = "0$month" if ($month < 10);
$day = "0$day" if ($day < 10);
$year+=1900;

my $URL = "http://finance.yahoo.com/q/hp?s=$symbol&a=00&b=1&c=1980&d=$month&e=$day&f=$year&g=v";

my $content;
if (defined ($content = get $URL)) {
  my $tree = HTML::TreeBuilder->new;
  $tree->parse($content);
  my $txt = HTML::FormatText->new;
  my @text = reverse(split("\n", $txt->format($tree)));

  my $work = 0;
  my $IsSplit = 0;
  my $lastDate;
  my $firstDate = "1980-01-01";
  my $ratio = 0;
  my $lastRatio = 0;
  my $sql;
  my ($one, $two);


  foreach (@text) {
    chomp($_);
    $work = 0 if (/Adj Close/i);
    if ($work) {
      s/^ +| +$//;

      if (/^(\d[^:]+):([^s]+)/i) {
          $IsSplit = 1;
          $one = $1;
          $two = $2;
          $one =~ s/^\s+|\s+$//;
          $two =~ s/^\s+|\s+$//;
      }

      if (/^\d.+\d$/ && $IsSplit) {
          $IsSplit = 0;
          $lastDate = FormatDate($_);
          $ratio = $two / $one;
          if (DateOk($firstDate, $lastDate) || $lastRatio != $ratio) {
            $lastRatio = $ratio;
            #print "$ratio at $lastDate\n";
            $sql = "UPDATE stockprices SET day_open = day_open * $ratio, day_low = day_low * $ratio, day_high = day_high * $ratio, day_close = day_close * $ratio, volume = volume * $ratio WHERE symbol = '$symbol' AND date < '$lastDate';\n";
            print $sql;
            $firstDate = $lastDate;
          } else {
            warn "Ignoring $two/$one split at $lastDate for $symbol\n";
          }
      }

    }
    $work = 1 if (/Close price/i);
  }
} else {
  die "could not get $symbol\n";
}


sub DateOk {
my ($firstDate, $lastDate) = @_;

#print "checking $firstDate vs $lastDate\n";
my @d1 = split "-", $firstDate;
my @d2 = split "-", $lastDate;
my $days = abs(Delta_Days ($d1[0], $d1[1], $d1[2], $d2[0], $d2[1], $d2[2]));
return 1 if ($days > 40);
return 0;
}

sub FormatDate {
my $date = shift;
my @date = split("-", $date);
#print "Formatting $date\n";

if ($date[2] > 85) {$date[2] = "19".$date[2];} else {$date[2] = "20".$date[2];}

return $date[2] . "-" . GetMonth($date[1]) . "-" . stuff($date[0]);
}

sub stuff {
my $day = shift;
return "0$day" if (length($day) == 1);
return $day;
}

sub GetMonth {
my $month = shift;
if ( $month =~ /Jan/i) {
return "01";
} elsif ( $month =~ /Feb/i) {
return "02";
} elsif ( $month =~ /Mar/i) {
return "03";
} elsif ( $month =~ /Apr/i) {
return "04";
} elsif ( $month =~ /May/i) {
return "05";
} elsif ( $month =~ /Jun/i) {
return "06";
} elsif ( $month =~ /Jul/i) {
return "07";
} elsif ( $month =~ /Aug/i) {
return "08";
} elsif ( $month =~ /Sep/i) {
return "09";
} elsif ( $month =~ /Oct/i) {
return "10";
} elsif ( $month =~ /Nov/i) {
return "11";
} elsif ( $month =~ /Dec/i) {
return "12";
} else {
die("Unrecognized month string ($month)");
}
}