<?php
/**
 * Piwik - free/libre analytics platform
 *
 * @link http://piwik.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 *
 */
namespace Piwik\DataTable\Renderer;

use Exception;
use Piwik\DataTable\Renderer;
use Piwik\DataTable\Simple;
use Piwik\DataTable;
use Piwik\Piwik;

/**
 * Returns the equivalent PHP array for a given DataTable.
 * You can specify in the constructor if you want the serialized version.
 * Please note that by default it will produce a flat version of the array.
 * See the method flatRender() for details. @see flatRender();
 *
 * Works with recursive DataTable (when a row can be associated with a subDataTable).
 *
 */
class Php extends Renderer
{
    protected $prettyDisplay = false;
    protected $serialize = true;

    /**
     * Enables/Disables serialize
     *
     * @param bool $bool
     */
    public function setSerialize($bool)
    {
        $this->serialize = (bool)$bool;
    }

    /**
     * Enables/Disables pretty display
     *
     * @param bool $bool
     */
    public function setPrettyDisplay($bool)
    {
        $this->prettyDisplay = (bool)$bool;
    }

    /**
     * Converts current data table to string
     *
     * @return string
     */
    public function __toString()
    {
        $data = $this->render();
        if (!is_string($data)) {
            $data = serialize($data);
        }
        return $data;
    }

    /**
     * Computes the dataTable output and returns the string/binary
     *
     * @param null|DataTable|DataTable\Map|Simple $dataTable
     * @return string
     */
    public function render($dataTable = null)
    {
        if (is_null($dataTable)) {
            $dataTable = $this->table;
        }
        $toReturn = $this->flatRender($dataTable);

        if ($this->prettyDisplay) {
            if (!is_array($toReturn)) {
                $toReturn = unserialize($toReturn);
            }
            $toReturn = "<pre>" . var_export($toReturn, true) . "</pre>";
        }
        return $toReturn;
    }

    /**
     * Produces a flat php array from the DataTable, putting "columns" and "metadata" on the same level.
     *
     * For example, when  a originalRender() would be
     *     array( 'columns' => array( 'col1_name' => value1, 'col2_name' => value2 ),
     *            'metadata' => array( 'metadata1_name' => value_metadata) )
     *
     * a flatRender() is
     *     array( 'col1_name' => value1,
     *            'col2_name' => value2,
     *            'metadata1_name' => value_metadata )
     *
     * @param null|DataTable|DataTable\Map|Simple $dataTable
     * @return array  Php array representing the 'flat' version of the datatable
     */
    public function flatRender($dataTable = null)
    {
        if (is_null($dataTable)) {
            $dataTable = $this->table;
        }

        if (is_array($dataTable)) {
            $flatArray = $dataTable;
            if (self::shouldWrapArrayBeforeRendering($flatArray)) {
                $flatArray = array($flatArray);
            }
        } elseif ($dataTable instanceof DataTable\Map) {
            $flatArray = array();
            foreach ($dataTable->getDataTables() as $keyName => $table) {
                $serializeSave = $this->serialize;
                $this->serialize = false;
                $flatArray[$keyName] = $this->flatRender($table);
                $this->serialize = $serializeSave;
            }
        } elseif ($dataTable instanceof Simple) {
            $flatArray = $this->renderSimpleTable($dataTable);

            // if we return only one numeric value then we print out the result in a simple <result> tag
            // keep it simple!
            if (count($flatArray) == 1) {
                $flatArray = current($flatArray);
            }
        } // A normal DataTable needs to be handled specifically
        else {
            $array = $this->renderTable($dataTable);
            $flatArray = $this->flattenArray($array);
        }

        if ($this->serialize) {
            $flatArray = serialize($flatArray);
        }

        return $flatArray;
    }

    /**
     *
     * @param array $array
     * @return array
     */
    protected function flattenArray($array)
    {
        $flatArray = array();
        foreach ($array as $row) {
            $newRow = $row['columns'] + $row['metadata'];
            if (isset($row['idsubdatatable'])
                && $this->hideIdSubDatatable === false
            ) {
                $newRow += array('idsubdatatable' => $row['idsubdatatable']);
            }
            if (isset($row['subtable'])) {
                $newRow += array('subtable' => $this->flattenArray($row['subtable']));
            }
            $flatArray[] = $newRow;
        }
        return $flatArray;
    }

    /**
     * Converts the current data table to an array
     *
     * @return array
     * @throws Exception
     */
    public function originalRender()
    {
        Piwik::checkObjectTypeIs($this->table, array('Simple', 'DataTable'));

        if ($this->table instanceof Simple) {
            $array = $this->renderSimpleTable($this->table);
        } elseif ($this->table instanceof DataTable) {
            $array = $this->renderTable($this->table);
        }

        if ($this->serialize) {
            $array = serialize($array);
        }
        return $array;
    }

    /**
     * Converts the given data table to an array
     *
     * @param DataTable $table
     * @return array
     */
    protected function renderTable($table)
    {
        $array = array();

        foreach ($table->getRows() as $id => $row) {
            $newRow = array(
                'columns'        => $row->getColumns(),
                'metadata'       => $row->getMetadata(),
                'idsubdatatable' => $row->getIdSubDataTable(),
            );

            if ($id == DataTable::ID_SUMMARY_ROW) {
                $newRow['issummaryrow'] = true;
            }

            $subTable = $row->getSubtable();
            if ($this->isRenderSubtables()
                && $subTable
            ) {
                $subTable = $this->renderTable($subTable);
                $newRow['subtable'] = $subTable;
                if ($this->hideIdSubDatatable === false
                    && isset($newRow['metadata']['idsubdatatable_in_db'])
                ) {
                    $newRow['columns']['idsubdatatable'] = $newRow['metadata']['idsubdatatable_in_db'];
                }
                unset($newRow['metadata']['idsubdatatable_in_db']);
            }
            if ($this->hideIdSubDatatable !== false) {
                unset($newRow['idsubdatatable']);
            }

            $array[] = $newRow;
        }
        return $array;
    }

    /**
     * Converts the simple data table to an array
     *
     * @param Simple $table
     * @return array
     */
    protected function renderSimpleTable($table)
    {
        $array = array();

        $row = $table->getFirstRow();
        if ($row === false) {
            return $array;
        }
        foreach ($row->getColumns() as $columnName => $columnValue) {
            $array[$columnName] = $columnValue;
        }
        return $array;
    }
}
