<?php

/**
 * ClickHeat : Classe de génération des cartes depuis un fichier ClickHeat / Maps generation class from a ClickHeat logfile
 *
 * Cette classe est VOLONTAIREMENT écrite pour PHP 4
 * This class is VOLUNTARILY written for PHP 4
 *
 * @author Yvan Taviaud - Dugwood - www.dugwood.com
 * @since 12/05/2007
 */
class HeatmapFromClicks extends Heatmap
{
	/** @var array $files Fichiers de suivi à étudier / Logfiles to use */
	var $files = array();
	/** @var string $browser Browser filter */
	var $browser;
	/** @var array $layout Webpage layout */
	var $layout;
	/** @var integer $minScreen Screen filter */
	var $minScreen;
	/** @var integer $maxScreen Screen filter */
	var $maxScreen;

	/**
	 * Add a file to parse and check existence
	 *
	 * @param string $file
	 */
	function addFile($file)
	{
		if (file_exists($file))
		{
			$this->files[] = $file;
		}
	}

	/**
	 * Do some tasks before drawing (database connection...)
	 */
	function startDrawing()
	{
		return true;
	}

	/**
	 * Find pixels coords and draw these on the current image
	 *
	 * @param integer $image Number of the image (to be used with $this->height)
	 * @return boolean Success
	 */
	function drawPixels($image)
	{
		/** If it's not the first image, just use the value stored in the temp files */
		if ($image !== 0)
		{
			if (file_exists($this->cache.sprintf($this->file, $image).'_log'))
			{
				$f = fopen($this->cache.sprintf($this->file, $image).'_log', 'r');
				while (feof($f) === false)
				{
					$click = explode('|', trim(fgets($f, 1024)));
					if (count($click) === 3)
					{
						$x = (int) $click[0];
						$y = (int) $click[1];
						$c = (bool) $click[2];
						if ($this->heatmap === true)
						{
							/** Apply a calculus for the step, with increases the speed of rendering: step = 3, then pixel is drawn at x = 2 (center of a 3x3 square) */
							$x -= $x % $this->step - $this->startStep;
							$y -= $y % $this->step - $this->startStep;
							/** Add 1 to the current color of this pixel (color which represents the sum of clicks on this pixel) */
							$color = imagecolorat($this->image, $x, $y) + 1;
							imagesetpixel($this->image, $x, $y, $color);
							$this->maxClicks = max($this->maxClicks, $color);
						}
						else
						{
							/** Put a red or green cross at the click location */
							$color = $c === true ? 0xFF0000 : 0x00DC00;
							imageline($this->image, $x - 2, $y - 2, $x + 2, $y + 2, $color);
							imageline($this->image, $x + 2, $y - 2, $x - 2, $y + 2, $color);
						}
					}
				}
				fclose($f);
				unlink($this->cache.sprintf($this->file, $image).'_log');
			}
			return true;
		}

		$leftWidth = (int) $this->layout[1];
		$centerWidth = (int) $this->layout[2];
		$rightWidth = (int) $this->layout[3];
		if ($leftWidth !== 0 && $centerWidth !== 0 && $rightWidth === 0)
		{
			/** Fixed left menu and fixed center ? Fall back to a fixed left menu only */
			$leftWidth += $centerWidth;
			$centerWidth = 0;
		}
		elseif ($leftWidth === 0 && $centerWidth !== 0 && $rightWidth !== 0)
		{
			/** Fixed right menu and fixed center ? Fall back to a fixed right menu only */
			$rightWidth += $centerWidth;
			$centerWidth = 0;
		}
		elseif ($leftWidth !== 0 && $centerWidth !== 0 && $rightWidth !== 0)
		{
			/** Everything is fixed ?? */
			return $this->raiseError(LANG_ERROR_FIXED);
		}
		$totalWidth = $leftWidth + $centerWidth + $rightWidth;

		for ($file = 0; $file < count($this->files); $file++)
		{
			/** Read clicks in the log file */
			$f = @fopen($this->files[$file], 'r');
			if ($f === false)
			{
				return $this->raiseError(LANG_ERROR_FILE.': '.$this->files[$file]);
			}

			$buffer = '';
			$count = 0;
			while (true)
			{
				$buffer .= fgets($f, 1024);
				/** Grouping by 1000 clicks */
				if (feof($f) === false && $count++ !== 1000)
				{
					continue;
				}
				/** Do a regular match (faster and easier for large volume of data) */
				preg_match_all('~^(\d+)\|(\d+)\|(\d+)\|'.($this->browser === 'all' ? '[a-z]+' : $this->browser).'\|(\d)$~m', $buffer, $clicks);
				$buffer = '';

				for ($i = 0, $max = count($clicks[1]); $i < $max; $i++)
				{
					$x = (int) $clicks[1][$i]; // X
					$y = (int) $clicks[2][$i]; // Y
					$w = (int) $clicks[3][$i]; // display width
					$c = ($clicks[4][$i] < 3); // left click
					/** W is not in the range of sizes, or right click for heatmap, or X is greater than screen size, the website is too large for the window, so we don't know where the click is... ignore those clicks */
					if ($w <= $this->minScreen || $w > $this->maxScreen || $this->heatmap === true && $c === false || $x > $w)
					{
						continue;
					}
					/** Correction of X for liquid and/or fixed layouts */
					if ($w <= $totalWidth)
					{
						/** Display's width is less than fixed content's one, X is absolute, many thanks to «rollenc» for pointing this out and this fix */
					}
					elseif ($leftWidth !== 0 && $centerWidth === 0 && $rightWidth === 0)
					{
						/** Left fixed menu */
						if ($x <= $leftWidth)
						{
							/** Click in the left menu: X is good */
						}
						else
						{
							/** Apply a percentage on the rest of the screen */
							$x = $leftWidth + ceil(($this->width - $leftWidth) * ($x - $leftWidth) / ($w - $leftWidth));
						}
					}
					elseif ($leftWidth === 0 && $centerWidth === 0 && $rightWidth !== 0)
					{
						/** Right fixed menu */
						if ($w - $x <= $rightWidth)
						{
							/** Click in the right menu: X is good, but relative to the right border */
							$x = $this->width - ($w - $x);
						}
						else
						{
							/** Apply a percentage on the rest of the screen */
							$x = ceil(($this->width - $rightWidth) * $x / ($w - $rightWidth));
						}
					}
					elseif ($leftWidth !== 0 && $centerWidth === 0 && $rightWidth !== 0)
					{
						/** Left and right fixed menus */
						if ($w - $x <= $rightWidth)
						{
							/** Click in the right menu: X is good, but relative to the right border */
							$x = $this->width - ($w - $x);
						}
						elseif ($x <= $leftWidth)
						{
							/** Click in the left menu: X is good */
						}
						else
						{
							/** Apply a percentage on the rest of the screen */
							$x = $leftWidth + ceil(($this->width - $leftWidth - $rightWidth) * ($x - $leftWidth) / ($w - $leftWidth - $rightWidth));
						}
					}
					elseif ($leftWidth === 0 && $centerWidth !== 0 && $rightWidth === 0)
					{
						/** Fixed centered content */
						if (abs($x - $w / 2) <= $centerWidth / 2)
						{
							/** Click is in the centered content */
							$x = ($this->width - $w) / 2 + $x;
						}
						elseif ($x < $w / 2)
						{
							/** Click is at the left of the centered content */
							$x = ($this->width - $centerWidth) / ($w - $centerWidth) * $x;
						}
						else
						{
							/** Click is at the right of the centered content */
							$x = ($this->width + $centerWidth) / 2 + ($this->width - $centerWidth) / ($w - $centerWidth) * ($x - ($w + $centerWidth) / 2);
						}
					}
					else
					{
						/** Layout 100% */
						$x = $this->width / $w * $x;
					}
					$x = (int) $x;
					$y = (int) $y;
					if ($x < 0 || $x >= $this->width)
					{
						continue;
					}
					if ($y >= 0 && $y < $this->height)
					{
						if ($this->heatmap === true)
						{
							/** Apply a calculus for the step, with increases the speed of rendering: step = 3, then pixel is drawn at x = 2 (center of a 3x3 square) */
							$x -= $x % $this->step - $this->startStep;
							$y -= $y % $this->step - $this->startStep;
							/** Add 1 to the current color of this pixel (color which represents the sum of clicks on this pixel) */
							$color = imagecolorat($this->image, $x, $y) + 1;
							imagesetpixel($this->image, $x, $y, $color);
							$this->maxClicks = max($this->maxClicks, $color);
						}
						else
						{
							/** Put a red or green cross at the click location */
							$color = $c === true ? 0xFF0000 : 0x00DC00;
							imageline($this->image, $x - 2, $y - 2, $x + 2, $y + 2, $color);
							imageline($this->image, $x + 2, $y - 2, $x - 2, $y + 2, $color);
						}
					}
					else
					{
						/** Append to the temporary log of this image */
						error_log($x.'|'.($y % $this->height).'|'.$c."\n", 3, $this->cache.sprintf($this->file, ceil($y / $this->height) - 1).'_log');
					}
					/** Looking for the maximum height of click */
					$this->maxY = max($y, $this->maxY);
				}
				unset($clicks);

				if ($count !== 1001)
				{
					break;
				}
				$count = 0;
			}
			fclose($f);
		}
		return true;
	}

	/**
	 * Do some cleaning or ending tasks (close database, reset array...)
	 */
	function finishDrawing()
	{
		$this->files = array();
		return true;
	}

}