<?php
/*=======================================================================
// File:	JPGRAPH_DATE.PHP
// Description:	Classes to handle Date scaling
// Created: 	2005-05-02
// Ver:		$Id: jpgraph_date.php 912 2007-09-26 21:00:35Z ljp $
//
// Copyright (c) Aditus Consulting. All rights reserved.
//========================================================================
*/

DEFINE('HOURADJ_1', 0+30);
DEFINE('HOURADJ_2', 1+30);
DEFINE('HOURADJ_3', 2+30);
DEFINE('HOURADJ_4', 3+30);
DEFINE('HOURADJ_6', 4+30);
DEFINE('HOURADJ_12', 5+30);

DEFINE('MINADJ_1', 0+20);
DEFINE('MINADJ_5', 1+20);
DEFINE('MINADJ_10', 2+20);
DEFINE('MINADJ_15', 3+20);
DEFINE('MINADJ_30', 4+20);

DEFINE('SECADJ_1', 0);
DEFINE('SECADJ_5', 1);
DEFINE('SECADJ_10', 2);
DEFINE('SECADJ_15', 3);
DEFINE('SECADJ_30', 4);


DEFINE('YEARADJ_1', 0+30);
DEFINE('YEARADJ_2', 1+30);
DEFINE('YEARADJ_5', 2+30);

DEFINE('MONTHADJ_1', 0+20);
DEFINE('MONTHADJ_6', 1+20);

DEFINE('DAYADJ_1', 0);
DEFINE('DAYADJ_WEEK', 1);
DEFINE('DAYADJ_7', 1);

DEFINE('SECPERYEAR', 31536000);
DEFINE('SECPERDAY', 86400);
DEFINE('SECPERHOUR', 3600);
DEFINE('SECPERMIN', 60);


class DateScale extends LinearScale
{
    private $date_format = '';
    private $iStartAlign = false;
    private $iEndAlign = false;
    private $iStartTimeAlign = false;
    private $iEndTimeAlign = false;

    //---------------
    // CONSTRUCTOR
    public function DateScale($aMin=0, $aMax=0, $aType='x')
    {
        assert($aType=="x");
        assert($aMin<=$aMax);
        
        $this->type=$aType;
        $this->scale=array($aMin,$aMax);
        $this->world_size=$aMax-$aMin;
        $this->ticks = new LinearTicks();
        $this->intscale=true;
    }


    //------------------------------------------------------------------------------------------
    // Utility Function AdjDate()
    // Description: Will round a given time stamp to an even year, month or day
    // argument.
    //------------------------------------------------------------------------------------------

    public function AdjDate($aTime, $aRound=0, $aYearType=false, $aMonthType=false, $aDayType=false)
    {
        $y = (int)date('Y', $aTime);
        $m = (int)date('m', $aTime);
        $d = (int)date('d', $aTime);
        $h=0;
        $i=0;
        $s=0;
        if ($aYearType !== false) {
            $yearAdj = array(0=>1, 1=>2, 2=>5);
            if ($aRound == 0) {
                $y = floor($y/$yearAdj[$aYearType])*$yearAdj[$aYearType];
            } else {
                ++$y;
                $y = ceil($y/$yearAdj[$aYearType])*$yearAdj[$aYearType];
            }
            $m=1;
            $d=1;
        } elseif ($aMonthType !== false) {
            $monthAdj = array(0=>1, 1=>6);
            if ($aRound == 0) {
                $m = floor($m/$monthAdj[$aMonthType])*$monthAdj[$aMonthType];
                $d=1;
            } else {
                ++$m;
                $m = ceil($m/$monthAdj[$aMonthType])*$monthAdj[$aMonthType];
                $d=1;
            }
        } elseif ($aDayType !== false) {
            if ($aDayType == 0) {
                if ($aRound == 1) {
                    //++$d;
                    $h=23;
                    $i=59;
                    $s=59;
                }
            } else {
                // Adjust to an even week boundary.
        $w = (int)date('w', $aTime); // Day of week 0=Sun, 6=Sat
        if (true) { // Adjust to start on Mon
            if ($w==0) {
                $w=6;
            } else {
                --$w;
            }
        }
                if ($aRound == 0) {
                    $d -= $w;
                } else {
                    $d += (7-$w);
                    $h=23;
                    $i=59;
                    $s=59;
                }
            }
        }
        return mktime($h, $i, $s, $m, $d, $y);
    }

    //------------------------------------------------------------------------------------------
    // Wrapper for AdjDate that will round a timestamp to an even date rounding
    // it downwards.
    //------------------------------------------------------------------------------------------
    public function AdjStartDate($aTime, $aYearType=false, $aMonthType=false, $aDayType=false)
    {
        return $this->AdjDate($aTime, 0, $aYearType, $aMonthType, $aDayType);
    }

    //------------------------------------------------------------------------------------------
    // Wrapper for AdjDate that will round a timestamp to an even date rounding
    // it upwards
    //------------------------------------------------------------------------------------------
    public function AdjEndDate($aTime, $aYearType=false, $aMonthType=false, $aDayType=false)
    {
        return $this->AdjDate($aTime, 1, $aYearType, $aMonthType, $aDayType);
    }

    //------------------------------------------------------------------------------------------
    // Utility Function AdjTime()
    // Description: Will round a given time stamp to an even time according to
    // argument.
    //------------------------------------------------------------------------------------------

    public function AdjTime($aTime, $aRound=0, $aHourType=false, $aMinType=false, $aSecType=false)
    {
        $y = (int)date('Y', $aTime);
        $m = (int)date('m', $aTime);
        $d = (int)date('d', $aTime);
        $h = (int)date('H', $aTime);
        $i = (int)date('i', $aTime);
        $s = (int)date('s', $aTime);
        if ($aHourType !== false) {
            $aHourType %= 6;
            $hourAdj = array(0=>1, 1=>2, 2=>3, 3=>4, 4=>6, 5=>12);
            if ($aRound == 0) {
                $h = floor($h/$hourAdj[$aHourType])*$hourAdj[$aHourType];
            } else {
                if (($h % $hourAdj[$aHourType]==0) && ($i > 0 || $s > 0)) {
                    $h++;
                }
                $h = ceil($h/$hourAdj[$aHourType])*$hourAdj[$aHourType];
                if ($h >= 24) {
                    $aTime += 86400;
                    $y = (int)date('Y', $aTime);
                    $m = (int)date('m', $aTime);
                    $d = (int)date('d', $aTime);
                    $h -= 24;
                }
            }
            $i=0;
            $s=0;
        } elseif ($aMinType !== false) {
            $aMinType %= 5;
            $minAdj = array(0=>1, 1=>5, 2=>10, 3=>15, 4=>30);
            if ($aRound == 0) {
                $i = floor($i/$minAdj[$aMinType])*$minAdj[$aMinType];
            } else {
                if (($i % $minAdj[$aMinType]==0) && $s > 0) {
                    $i++;
                }
                $i = ceil($i/$minAdj[$aMinType])*$minAdj[$aMinType];
                if ($i >= 60) {
                    $aTime += 3600;
                    $y = (int)date('Y', $aTime);
                    $m = (int)date('m', $aTime);
                    $d = (int)date('d', $aTime);
                    $h = (int)date('H', $aTime);
                    $i = 0;
                }
            }
            $s=0;
        } elseif ($aSecType !== false) {
            $aSecType %= 5;
            $secAdj = array(0=>1, 1=>5, 2=>10, 3=>15, 4=>30);
            if ($aRound == 0) {
                $s = floor($s/$secAdj[$aSecType])*$secAdj[$aSecType];
            } else {
                $s = ceil($s/$secAdj[$aSecType]*1.0)*$secAdj[$aSecType];
                if ($s >= 60) {
                    $s=0;
                    $aTime += 60;
                    $y = (int)date('Y', $aTime);
                    $m = (int)date('m', $aTime);
                    $d = (int)date('d', $aTime);
                    $h = (int)date('H', $aTime);
                    $i = (int)date('i', $aTime);
                }
            }
        }
        return mktime($h, $i, $s, $m, $d, $y);
    }

    //------------------------------------------------------------------------------------------
    // Wrapper for AdjTime that will round a timestamp to an even time rounding
    // it downwards.
    // Example: AdjStartTime(mktime(18,27,13,2,22,2005),false,2) => 18:20
    //------------------------------------------------------------------------------------------
    public function AdjStartTime($aTime, $aHourType=false, $aMinType=false, $aSecType=false)
    {
        return $this->AdjTime($aTime, 0, $aHourType, $aMinType, $aSecType);
    }

    //------------------------------------------------------------------------------------------
    // Wrapper for AdjTime that will round a timestamp to an even time rounding
    // it upwards
    // Example: AdjEndTime(mktime(18,27,13,2,22,2005),false,2) => 18:30
    //------------------------------------------------------------------------------------------
    public function AdjEndTime($aTime, $aHourType=false, $aMinType=false, $aSecType=false)
    {
        return $this->AdjTime($aTime, 1, $aHourType, $aMinType, $aSecType);
    }

    //------------------------------------------------------------------------------------------
    // DateAutoScale
    // Autoscale a date axis given start and end time
    // Returns an array ($start,$end,$major,$minor,$format)
    //------------------------------------------------------------------------------------------
    public function DoDateAutoScale($aStartTime, $aEndTime, $aDensity=0, $aAdjust=true)
    {
        // Format of array
        // array ( Decision point,  array( array( Major-scale-step-array ),
        //			    array( Minor-scale-step-array ),
        //			    array( 0=date-adjust, 1=time-adjust, adjustment-alignment) )
        //
        $scalePoints =
        array(
        /* Intervall larger than 10 years */
        SECPERYEAR*10,array(array(SECPERYEAR*5,SECPERYEAR*2),
                    array(SECPERYEAR),
                    array(0,YEARADJ_1, 0,YEARADJ_1) ),

        /* Intervall larger than 2 years */
        SECPERYEAR*2,array(array(SECPERYEAR),array(SECPERYEAR),
                   array(0,YEARADJ_1) ),

        /* Intervall larger than 90 days (approx 3 month) */
        SECPERDAY*90,array(array(SECPERDAY*30,SECPERDAY*14,SECPERDAY*7,SECPERDAY),
                   array(SECPERDAY*5,SECPERDAY*7,SECPERDAY,SECPERDAY),
                   array(0,MONTHADJ_1, 0,DAYADJ_WEEK, 0,DAYADJ_1, 0,DAYADJ_1)),

        /* Intervall larger than 30 days (approx 1 month) */
        SECPERDAY*30,array(array(SECPERDAY*14,SECPERDAY*7,SECPERDAY*2, SECPERDAY),
                   array(SECPERDAY,SECPERDAY,SECPERDAY,SECPERDAY),
                   array(0,DAYADJ_WEEK, 0,DAYADJ_1, 0,DAYADJ_1, 0,DAYADJ_1)),

        /* Intervall larger than 7 days */
        SECPERDAY*7,array(array(SECPERDAY,SECPERHOUR*12,SECPERHOUR*6,SECPERHOUR*2),
                  array(SECPERHOUR*6,SECPERHOUR*3,SECPERHOUR,SECPERHOUR),
                  array(0,DAYADJ_1, 1,HOURADJ_12, 1,HOURADJ_6, 1,HOURADJ_1)),

        /* Intervall larger than 1 day */
        SECPERDAY,array(array(SECPERDAY,SECPERHOUR*12,SECPERHOUR*6,SECPERHOUR*2,SECPERHOUR),
                array(SECPERHOUR*6,SECPERHOUR*2,SECPERHOUR,SECPERHOUR,SECPERHOUR),
                array(1,HOURADJ_12, 1,HOURADJ_6, 1,HOURADJ_1, 1,HOURADJ_1)),

        /* Intervall larger than 12 hours */
        SECPERHOUR*12,array(array(SECPERHOUR*2,SECPERHOUR,SECPERMIN*30,900,600),
                    array(1800,1800,900,300,300),
                    array(1,HOURADJ_1, 1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

        /* Intervall larger than 2 hours */
        SECPERHOUR*2,array(array(SECPERHOUR,SECPERMIN*30,900,600,300),
                   array(1800,900,300,120,60),
                   array(1,HOURADJ_1, 1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

        /* Intervall larger than 1 hours */
        SECPERHOUR,array(array(SECPERMIN*30,900,600,300),array(900,300,120,60),
                 array(1,MINADJ_30, 1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5) ),

        /* Intervall larger than 30 min */
        SECPERMIN*30,array(array(SECPERMIN*15,SECPERMIN*10,SECPERMIN*5,SECPERMIN),
                   array(300,300,60,10),
                   array(1,MINADJ_15, 1,MINADJ_10, 1,MINADJ_5, 1,MINADJ_1)),

        /* Intervall larger than 1 min */
        SECPERMIN,array(array(SECPERMIN,15,10,5),
                array(15,5,2,1),
                array(1,MINADJ_1, 1,SECADJ_15, 1,SECADJ_10, 1,SECADJ_5)),

        /* Intervall larger than 10 sec */
        10,array(array(5,2),
             array(1,1),
             array(1,SECADJ_5, 1,SECADJ_1)),

        /* Intervall larger than 1 sec */
        1,array(array(1),
            array(1),
            array(1,SECADJ_1)),
        );

        $ns = count($scalePoints);
        // Establish major and minor scale units for the date scale
        $diff = $aEndTime - $aStartTime;
        if ($diff < 1) {
            return false;
        }
        $done=false;
        $i=0;
        while (! $done) {
            if ($diff > $scalePoints[2*$i]) {
                // Get major and minor scale for this intervall
                $scaleSteps = $scalePoints[2*$i+1];
                $major = $scaleSteps[0][min($aDensity, count($scaleSteps[0])-1)];
                // Try to find out which minor step looks best
                $minor = $scaleSteps[1][min($aDensity, count($scaleSteps[1])-1)];
                if ($aAdjust) {
                    // Find out how we should align the start and end timestamps
                    $idx = 2*min($aDensity, floor(count($scaleSteps[2])/2)-1);
                    if ($scaleSteps[2][$idx] === 0) {
                        // Use date adjustment
                        $adj = $scaleSteps[2][$idx+1];
                        if ($adj >= 30) {
                            $start = $this->AdjStartDate($aStartTime, $adj-30);
                            $end   = $this->AdjEndDate($aEndTime, $adj-30);
                        } elseif ($adj >= 20) {
                            $start = $this->AdjStartDate($aStartTime, false, $adj-20);
                            $end   = $this->AdjEndDate($aEndTime, false, $adj-20);
                        } else {
                            $start = $this->AdjStartDate($aStartTime, false, false, $adj);
                            $end   = $this->AdjEndDate($aEndTime, false, false, $adj);
                            // We add 1 second for date adjustment to make sure we end on 00:00 the following day
                            // This makes the final major tick be srawn when we step day-by-day instead of ending
                            // on xx:59:59 which would not draw the final major tick
                            $end++;
                        }
                    } else {
                        // Use time adjustment
                        $adj = $scaleSteps[2][$idx+1];
                        if ($adj >= 30) {
                            $start = $this->AdjStartTime($aStartTime, $adj-30);
                            $end   = $this->AdjEndTime($aEndTime, $adj-30);
                        } elseif ($adj >= 20) {
                            $start = $this->AdjStartTime($aStartTime, false, $adj-20);
                            $end   = $this->AdjEndTime($aEndTime, false, $adj-20);
                        } else {
                            $start = $this->AdjStartTime($aStartTime, false, false, $adj);
                            $end   = $this->AdjEndTime($aEndTime, false, false, $adj);
                        }
                    }
                }
                // If the overall date span is larger than 1 day ten we show date
                $format = '';
                if (($end-$start) > SECPERDAY) {
                    $format = 'Y-m-d ';
                }
                // If the major step is less than 1 day we need to whow hours + min
                if ($major < SECPERDAY) {
                    $format .= 'H:i';
                }
                // If the major step is less than 1 min we need to show sec
                if ($major < 60) {
                    $format .= ':s';
                }
                $done=true;
            }
            ++$i;
        }
        return array($start,$end,$major,$minor,$format);
    }

    // Overrides the automatic determined date format. Must be a valid date() format string
    public function SetDateFormat($aFormat)
    {
        $this->date_format = $aFormat;
        $this->ticks->SetLabelDateFormat($this->date_format);
    }

    public function AdjustForDST($aFlg=true)
    {
        $this->ticks->AdjustForDST($aFlg);
    }


    public function SetDateAlign($aStartAlign, $aEndAlign=false)
    {
        if ($aEndAlign === false) {
            $aEndAlign=$aStartAlign;
        }
        $this->iStartAlign = $aStartAlign;
        $this->iEndAlign = $aEndAlign;
    }

    public function SetTimeAlign($aStartAlign, $aEndAlign=false)
    {
        if ($aEndAlign === false) {
            $aEndAlign=$aStartAlign;
        }
        $this->iStartTimeAlign = $aStartAlign;
        $this->iEndTimeAlign = $aEndAlign;
    }


    public function AutoScale($img, $aStartTime, $aEndTime, $aNumSteps, $_adummy=false)
    {
        // We need to have one dummy argument to make the signature of AutoScale()
        // identical to LinearScale::AutoScale
        if ($aStartTime == $aEndTime) {
            // Special case when we only have one data point.
            // Create a small artifical intervall to do the autoscaling
            $aStartTime -= 10;
            $aEndTime += 10;
        }
        $done=false;
        $i=0;
        while (! $done && $i < 5) {
            list($adjstart, $adjend, $maj, $min, $format) = $this->DoDateAutoScale($aStartTime, $aEndTime, $i);
            $n = floor(($adjend-$adjstart)/$maj);
            if ($n * 1.7 > $aNumSteps) {
                $done=true;
            }
            $i++;
        }
    
        /*
        if( 0 ) { // DEBUG
            echo "    Start =".date("Y-m-d H:i:s",$aStartTime)."<br>";
            echo "    End   =".date("Y-m-d H:i:s",$aEndTime)."<br>";
            echo "Adj Start =".date("Y-m-d H:i:s",$adjstart)."<br>";
            echo "Adj End   =".date("Y-m-d H:i:s",$adjend)."<p>";
            echo "Major = $maj s, ".floor($maj/60)."min, ".floor($maj/3600)."h, ".floor($maj/86400)."day<br>";
            echo "Min = $min s, ".floor($min/60)."min, ".floor($min/3600)."h, ".floor($min/86400)."day<br>";
            echo "Format=$format<p>";
        }
        */
    
        if ($this->iStartTimeAlign !== false && $this->iStartAlign !== false) {
            JpGraphError::RaiseL(3001);
            //('It is only possible to use either SetDateAlign() or SetTimeAlign() but not both');
        }

        if ($this->iStartTimeAlign !== false) {
            if ($this->iStartTimeAlign >= 30) {
                $adjstart = $this->AdjStartTime($aStartTime, $this->iStartTimeAlign-30);
            } elseif ($this->iStartTimeAlign >= 20) {
                $adjstart = $this->AdjStartTime($aStartTime, false, $this->iStartTimeAlign-20);
            } else {
                $adjstart = $this->AdjStartTime($aStartTime, false, false, $this->iStartTimeAlign);
            }
        }
        if ($this->iEndTimeAlign !== false) {
            if ($this->iEndTimeAlign >= 30) {
                $adjend = $this->AdjEndTime($aEndTime, $this->iEndTimeAlign-30);
            } elseif ($this->iEndTimeAlign >= 20) {
                $adjend = $this->AdjEndTime($aEndTime, false, $this->iEndTimeAlign-20);
            } else {
                $adjend = $this->AdjEndTime($aEndTime, false, false, $this->iEndTimeAlign);
            }
        }


        if ($this->iStartAlign !== false) {
            if ($this->iStartAlign >= 30) {
                $adjstart = $this->AdjStartDate($aStartTime, $this->iStartAlign-30);
            } elseif ($this->iStartAlign >= 20) {
                $adjstart = $this->AdjStartDate($aStartTime, false, $this->iStartAlign-20);
            } else {
                $adjstart = $this->AdjStartDate($aStartTime, false, false, $this->iStartAlign);
            }
        }
        if ($this->iEndAlign !== false) {
            if ($this->iEndAlign >= 30) {
                $adjend = $this->AdjEndDate($aEndTime, $this->iEndAlign-30);
            } elseif ($this->iEndAlign >= 20) {
                $adjend = $this->AdjEndDate($aEndTime, false, $this->iEndAlign-20);
            } else {
                $adjend = $this->AdjEndDate($aEndTime, false, false, $this->iEndAlign);
            }
        }
        $this->Update($img, $adjstart, $adjend);
        if (! $this->ticks->IsSpecified()) {
            $this->ticks->Set($maj, $min);
        }
        if ($this->date_format == '') {
            $this->ticks->SetLabelDateFormat($format);
        } else {
            $this->ticks->SetLabelDateFormat($this->date_format);
        }
    }
}