<?php

/**
 * DomFramework
 * @package domframework
 * @author Dominique Fournier <dominique@fournier38.fr>
 * @license BSD
 */

namespace Domframework;

/**
 * Manage the vertical axis
 */
class GraphAxisVertical extends GraphAxisGeneral
{
    /**
     * The angle choosed to draw the graph
     */
    private $angle;

    /**
     * The padding between the label and the axis
     */
    protected $padding = 7;

    /**
     * The width of the labels + padding (it is the base of the graph) in pixels
     */
    protected $width;

    /**
     * The number of chars to be displayed in one label
     */
    protected $nbcharsLabel = 0;

    /**
     * Look for the width of the Y axis
     * @param resource $gd The resource to modify
     */
    public function getWidth($gd)
    {
        if ($this->numerical) {
            if ($this->max === null) {
                throw new \Exception(dgettext(
                    "domframework",
                    "The max is not defined for graphAxisVertical"
                ), 406);
            }
            // Look at the minimum distance between two labeled values
            $bbox = imagettfbbox($this->fontsize, 0, $this->fontfile, "NOT");
            $height = abs($bbox[5] - $bbox[1]) + $this->padding;
            for ($nbMaxValues = 10; $nbMaxValues > 2; $nbMaxValues--) {
                if ($nbMaxValues * $height < abs($this->top - $this->bottom)) {
                    break;
                }
            }
            $labels = $this->labels($nbMaxValues);
            $labelBiggest = "";
            $this->nbcharsLabel = 0;
            foreach ($labels as $label) {
                if (strlen($label) > $this->nbcharsLabel) {
                    $this->nbcharsLabel = strlen($label);
                    $labelBiggest = $label;
                }
            }
            $bbox = imagettfbbox(
                $this->fontsize,
                $this->angle,
                $this->fontfile,
                $labelBiggest
            );
            $width = abs($bbox[4] - $bbox[0]);
            $this->width = $width + 2 * $this->padding;
            return $this->width;
        } else {
            if ($this->data === null) {
                return $this->padding;
            }
            die("TODO : getWidth in labeled line " . __LINE__ . "\n");
        }
    }

    /**
     * Calculate the position in pixels for a value
     * If the value is out of range, return null to not draw the point
     * @param string|float|integer $value The value to position
     */
    public function position($value)
    {
        if ($value === null) {
            return null;
        }
        if (! is_numeric($value) && ! is_string($value)) {
            throw new \Exception(dgettext(
                "domframework",
                "Invalid value provided to graph Axis for position"
            ) . " " .
            get_class($this), 406);
        }
        if ($this->numerical === null) {
            throw new \Exception(dgettext(
                "domframework",
                "No numerical type defined for Axis"
            ) . " " . get_class($this), 406);
        }
        if ($this->numerical) {
            // Numerical axis, use a standard scale
            if ($value > $this->labelMax || $value < $this->labelMin) {
                return null;
            }
            $scale = ($value - $this->labelMin) / ($this->labelMax - $this->labelMin);
            $pos = intval($this->bottom + $scale * ($this->top - $this->bottom));
            return $pos;
        } else {
            // Label axis, count them
            if (! is_array($this->data)) {
                throw new \Exception(dgettext(
                    "domframework",
                    "No data defined for Axis"
                ) . " " . get_class($this), 406);
            }
            $pos = array_search($value, $this->data, true);
            if ($pos === false) {
                return null;
            }
            $width = ($this->top - $this->bottom) / count($this->data);
            $pos = intval($this->bottom + $width * $pos + $width / 2);
            return $pos;
        }
    }

    /**
     * Calculate the positionMin, used for labeled axies
     * If the value is out of range, return null to not draw the point
     * @param string|float|integer $value The value to position
     */
    public function positionMin($value)
    {
        $posCenter = $this->position($value);
        if ($this->numerical) {
            return $posCenter;
        }
        if (! is_array($this->data)) {
            throw new \Exception(dgettext(
                "domframework",
                "No data defined for Axis"
            ) . " " . get_class($this), 406);
        }
        $pos = array_search($value, $this->data, true);
        if ($pos === false) {
            return null;
        }
        $width = ($this->top - $this->bottom) / count($this->data);
        return intval($this->bottom + $width * $pos);
    }

    /**
     * Calculate the positionMax, used for labeled axies
     * If the value is out of range, return null to not draw the point
     * @param string|float|integer $value The value to position
     */
    public function positionMax($value)
    {
        $posCenter = $this->position($value);
        if ($this->numerical) {
            return $posCenter;
        }
        if (! is_array($this->data)) {
            throw new \Exception(dgettext(
                "domframework",
                "No data defined for Axis"
            ) . " " . get_class($this), 406);
        }
        $pos = array_search($value, $this->data, true);
        if ($pos === false) {
            return null;
        }
        $width = ($this->top - $this->bottom) / count($this->data);
        return intval($this->bottom + $width * $pos + $width);
    }

    /**
     * Draw the axis labels and lines
     * @param resource $gd The resource to modify
     */
    public function draw($gd)
    {
        $axisColor = Color::allocateFromText($gd, $this->axisColor);
        if ($this->numerical) {
            // Look at the minimum distance between two labeled values
            $bbox = imagettfbbox($this->fontsize, 0, $this->fontfile, "NOT");
            $height = abs($bbox[5] - $bbox[1]) + $this->padding;
            for ($nbMaxValues = 10; $nbMaxValues > 2; $nbMaxValues--) {
                if ($nbMaxValues * $height < abs($this->top - $this->bottom)) {
                    break;
                }
            }

            $width = $this->getWidth($gd);
            $labels = $this->labels($nbMaxValues);
            if (count($labels) > $nbMaxValues) {
                die("Too much labels to display (" .
                count($labels) . " > $nbMaxValues)\n");
            }
            foreach ($labels as $label) {
                $this->drawOne($gd, $width, $label);
                $this->drawGrid($gd, $width, $label);
            }
            $this->drawAxis($gd, $width);
        } else {
            // Labeled
            // If there is no data, there is nothing to draw : return
            if ($this->data === null) {
                return;
            }
            die("graphAxisVertical::draw labeled TBD line " . __LINE__ . "\n");
        }
    }
}