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<?php
require_once "../init.php";
require_once BASE . "/lib/mysql.php";

if (array_key_exists("from", $_GET))
  $min_time="from_base64(\"" . base64_encode("-".$_GET["from"]) . "\")";
else
  $min_time="\"-7 00:00:00\"";

if (array_key_exists("arch", $_GET)) {
  $arch_filter = arch_filter_query("architectures");
  $combiner_left = "";
  $combiner_right = "";
  $grouper = "";
  $joiner = " JOIN `architectures` ON `statistics`.`architecture`=`architectures`.`id`";
} else {
  $arch_filter = "1";
  $combiner_left = "SUM(";
  $combiner_right = ")";
  $grouper = " GROUP BY `statistics`.`date`";
  $joiner = "";
};

$column_list = array(
  "pending_tasks_count",
  "pending_packages_count",
  "staging_packages_count",
  "testing_packages_count",
  "tested_packages_count",
  "broken_tasks_count",
  "dependency_loops_count",
  "dependency_looped_tasks_count",
  "locked_tasks_count",
  "blocked_tasks_count",
  "next_tasks_count"
);

function combine_column($name) {
  global $combiner_left;
  global $combiner_right;
  return $combiner_left . "`statistics`.`" . $name . "`" . $combiner_right . " AS `" . $name . "`";
}

$result = mysql_run_query(
  "SELECT DISTINCT ".
  "UNIX_TIMESTAMP(`statistics`.`date`) AS `date`," .
  implode(",",array_map("combine_column",$column_list)) .
  "FROM `statistics` " .
  $joiner .
  "WHERE `statistics`.`date`>=ADDDATE(NOW()," . $min_time . ") " .
  "AND " . $arch_filter .
  $grouper .
  "ORDER BY `statistics`.`date`"
);

$t_min = -1;
$t_max = -1;
$val_max = -1;

while($vals = $result->fetch_assoc()) {
  if ($t_min == -1)
    $t_min = $vals["date"];
  $t_max = $vals["date"];
  foreach ($vals as $column => $val)
    if ($column != "date") {
      $values[$column][$vals["date"]] = $val;
      $val_max = max($val_max,$val);
    }
};
$print_columns = array_keys($values);

$max_len = 0;
foreach ($print_columns as $column) {
  $len = strlen($values[$column][$t_max])+1;
  if ($len > $max_len)
    $max_len = $len;
}

$width = 1600;
$height = 600;
$border = 5;
$legend_line_length = 10;
$legend_height = 2 * ImageFontHeight(5) + $legend_line_length;

$im = @ImageCreate ($width + $legend_line_length + $max_len * ImageFontWidth(5), $height + $legend_height)
      or die ("Cannot create new gd-image-stream");

$background_color = ImageColorAllocate ($im, 255, 255, 255);
$foreground_color = ImageColorAllocate ($im, 0, 0, 0);

$colors['stable_packages_count'] = ImageColorAllocate ($im, 0, 0, 0);
$colors['pending_tasks_count'] = ImageColorAllocate ($im, 0, 0, 128);
$colors['pending_packages_count'] = ImageColorAllocate ($im, 0, 0, 255);
$colors['staging_packages_count'] = ImageColorAllocate ($im, 0, 100, 0);
$colors['testing_packages_count'] = ImageColorAllocate ($im, 0, 200, 0);
$colors['tested_packages_count'] = ImageColorAllocate ($im, 100, 255, 0);
$colors['broken_tasks_count'] = ImageColorAllocate ($im, 255, 0, 0);
$colors['dependency_loops_count'] = ImageColorAllocate ($im, 128, 128, 0);
$colors['dependency_looped_tasks_count'] = ImageColorAllocate ($im, 255, 128, 128);
$colors['locked_tasks_count'] = ImageColorAllocate ($im, 128, 128, 128);
$colors['blocked_tasks_count'] = ImageColorAllocate ($im, 128, 0, 0);
$colors['next_tasks_count'] = ImageColorAllocate ($im, 0, 255, 255);

function scale($x, $x_min, $x_max, $scale, $log) {
  if ($log) {
    $x = log($x + 10);
    $x_min = log($x_min + 10);
    $x_max = log($x_max + 10);
  };
  if ($x_max == $x_min)
    $frac = 0;
  else
    $frac = ($x - $x_min)/($x_max - $x_min);
  if ($scale < 0)
    return ($frac-1) * $scale;
  else
    return $frac * $scale;
};

function print_graph($data, $color) {
  global $width, $height, $im, $t_min, $t_max, $val_max, $border, $legend_line_length;
  ksort($data);
  $last_t = -1;
  $last_val = -1;
  foreach ($data as $t => $val) {
    if ($last_t != -1)
      ImageLine(
        $im,
        scale($last_t,$t_min,$t_max,$width-2*$border,false)+$border+$legend_line_length,
        scale($last_val,0,$val_max,-$height+2*$border,array_key_exists("log", $_GET))+$border,
        scale($t,$t_min,$t_max,$width-2*$border,false)+$border+$legend_line_length,
        scale($val,0,$val_max,-$height+2*$border,array_key_exists("log", $_GET))+$border,
        $color
      );
    $last_t = $t;
    $last_val = $val;
  }
  ImageString(
    $im,
    5,
    $width+$legend_line_length,
    scale($last_val,0,$val_max,-$height+2*$border,array_key_exists("log", $_GET))+$border - ImageFontHeight(5)/2,
    " ".$data[$t_max],
    $color
  );
};

ImageRectangle($im, $legend_line_length, 0, $width-1+$legend_line_length, $height-1, $foreground_color);

$xpos = $legend_line_length;
foreach ($print_columns as $column) {
  print_graph($values[$column], $colors[$column]);
  ImageString($im, 5, $xpos, $height + $legend_line_length + ImageFontHeight(5), substr($column,0,-strlen("_count")), $colors[$column]);
  $xpos += (strlen($column) - strlen("_count") + 1.75) * ImageFontWidth(5);
}

ImageString($im, 5, $legend_line_length, $height + $legend_line_length, date('Y-m-d H:i', $t_min), $foreground_color);
$s = date('Y-m-d H:i', $t_max);
ImageString($im, 5, $width+$legend_line_length - strlen($s)*ImageFontWidth(5), $height + $legend_line_length, $s, $foreground_color);

for ($t=ceil($t_min/24/60/60); $t<=floor($t_max/24/60/60); $t++)
  ImageLine(
    $im,
    scale($t*24*60*60,$t_min,$t_max,$width-2*$border,false)+$border+$legend_line_length,
    $height,
    scale($t*24*60*60,$t_min,$t_max,$width-2*$border,false)+$border+$legend_line_length,
    $height+$legend_line_length,
    $foreground_color
  );

for ($val=0; $val<=$val_max;) {
  ImageLine(
    $im,
    0,
    scale($val,0,$val_max,-$height+2*$border,array_key_exists("log", $_GET))+$border,
    $legend_line_length,
    scale($val,0,$val_max,-$height+2*$border,array_key_exists("log", $_GET))+$border,
    $foreground_color
  );
  if (! array_key_exists("log", $_GET))
    $val+=pow(10,round(log($val_max)/log(10))-1);
  elseif ($val==0)
    $val++;
  else
    $val=$val*10;
}

// ImageString ($im, 1, 5, 5, "Test-String ".rand(), $foreground_color);

header ("Content-type: image/png");

ImagePNG ($im);

?>