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<?php

/**
 * @file classes/db/DBDataXMLParser.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class DBDataXMLParser
 *
 * @ingroup db
 *
 * @brief Class to import and export database data from an XML format.
 * See dbscripts/xml/dtd/xmldata.dtd for the XML schema used.
 */

namespace PKP\db;

use Exception;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use PKP\config\Config;
use PKP\xml\PKPXMLParser;
use PKP\xml\XMLNode;

class DBDataXMLParser
{
    /** @var array the array of parsed SQL statements */
    public $sql;

    /**
     * Constructor.
     */
    public function __construct()
    {
        $this->sql = [];
    }

    /**
     * Parse an XML data file into SQL statements.
     *
     * @param string $file path to the XML file to parse
     *
     * @return array the array of SQL statements parsed
     */
    public function parseData($file)
    {
        $this->sql = [];
        $parser = new PKPXMLParser();
        $tree = $parser->parse($file);
        if (!$tree) {
            return [];
        }

        $allTables = DB::getDoctrineSchemaManager()->listTableNames();

        foreach ($tree->getChildren() as $type) {
            switch ($type->getName()) {
                case 'table':
                    $fieldDefaultValues = [];

                    // Match table element
                    foreach ($type->getChildren() as $row) {
                        switch ($row->getName()) {
                            case 'row':
                                // Match a row element
                                $fieldValues = [];

                                foreach ($row->getChildren() as $field) {
                                    // Get the field names and values for this INSERT
                                    [$fieldName, $value] = $this->_getFieldData($field);
                                    $fieldValues[$fieldName] = $value;
                                }

                                $fieldValues = array_merge($fieldDefaultValues, $fieldValues);

                                if (count($fieldValues) > 0) {
                                    $this->sql[] = sprintf(
                                        'INSERT INTO %s (%s) VALUES (%s)',
                                        $type->getAttribute('name'),
                                        join(', ', array_keys($fieldValues)),
                                        join(', ', array_values($fieldValues))
                                    );
                                }
                                break;
                            default: assert(false);
                        }
                    }
                    break;
                case 'sql':
                    // Match sql element (set of SQL queries)
                    foreach ($type->getChildren() as $child) {
                        switch ($child->getName()) {
                            case 'drop':
                                $table = $child->getAttribute('table');
                                $column = $child->getAttribute('column');
                                if ($column) {
                                    $this->sql = array_merge($this->sql, array_column(DB::pretend(function () use ($table, $column) {
                                        Schema::table($table, function (Blueprint $table) use ($column) {
                                            $table->dropColumn($column);
                                        });
                                    }), 'query'));
                                } else {
                                    $this->sql = array_merge($this->sql, array_column(DB::pretend(function () use ($table) {
                                        Schema::drop($table);
                                    }), 'query'));
                                }
                                break;
                            case 'rename':
                                $table = $child->getAttribute('table');
                                $column = $child->getAttribute('column');
                                $to = $child->getAttribute('to');
                                if ($column) {
                                    // Rename a column.
                                    $this->sql = array_merge($this->sql, array_column(DB::pretend(function () use ($table, $column, $to) {
                                        Schema::table($table, function (Blueprint $table) use ($column, $to) {
                                            $table->renameColumn($column, $to);
                                        });
                                    }), 'query'));
                                } else {
                                    // Rename the table.
                                    $this->sql = array_merge($this->sql, array_column(DB::pretend(function () use ($table, $to) {
                                        Schema::rename($table, $to);
                                    }), 'query'));
                                }
                                break;
                            case 'dropindex':
                                $table = $child->getAttribute('table');
                                $index = $child->getAttribute('index');
                                if (!$table || !$index) {
                                    throw new Exception('dropindex called without table or index');
                                }

                                $schemaManager = DB::getDoctrineSchemaManager();
                                if ($child->getAttribute('ifexists') && !in_array($index, array_keys($schemaManager->listTableIndexes($table)))) {
                                    break;
                                }
                                $this->sql = array_merge($this->sql, array_column(DB::pretend(function () use ($table, $index) {
                                    Schema::table($table, function (Blueprint $table) use ($index) {
                                        $table->dropIndex($index);
                                    });
                                }), 'query'));
                                break;
                            case 'query':
                                // If a "driver" attribute is specified, multiple drivers can be
                                // specified with a comma separator.
                                $driver = $child->getAttribute('driver');
                                if (empty($driver) || in_array(Config::getVar('database', 'driver'), array_map('trim', explode(',', $driver)))) {
                                    $this->sql[] = $child->getValue();
                                }
                                break;
                        }
                    }
                    break;
            }
        }
        return $this->sql;
    }

    /**
     * Execute the parsed SQL statements.
     *
     * @param bool $continueOnError continue to execute remaining statements if a failure occurs
     *
     * @return bool success
     */
    public function executeData($continueOnError = false)
    {
        foreach ($this->sql as $stmt) {
            try {
                DB::statement($stmt);
            } catch (Exception $e) {
                if (!$continueOnError) {
                    throw $e;
                }
            }
        }
        return true;
    }

    /**
     * Return the parsed SQL statements.
     *
     * @return array
     */
    public function getSQL()
    {
        return $this->sql;
    }

    /**
     * Quote a string to be appear as a value in an SQL INSERT statement.
     *
     * @param string $str
     *
     * @return string
     */
    public function quoteString($str)
    {
        return DB::getPdo()->quote($str);
    }


    //
    // Private helper methods
    //
    /**
     * retrieve a field name and value from a field node
     *
     * @param XMLNode $fieldNode
     *
     * @return array an array with two entries: the field
     *  name and the field value
     */
    public function _getFieldData($fieldNode)
    {
        $fieldName = $fieldNode->getAttribute('name');
        $fieldValue = $fieldNode->getValue();

        // Is this field empty? If so: do we want NULL or
        // an empty string?
        $isEmpty = $fieldNode->getAttribute('null');
        if (!is_null($isEmpty)) {
            assert(is_null($fieldValue));
            switch ($isEmpty) {
                case 1:
                    $fieldValue = null;
                    break;

                case 0:
                    $fieldValue = '';
                    break;
            }
        }

        // Translate null to 'NULL' for SQL use.
        if (is_null($fieldValue)) {
            $fieldValue = 'NULL';
        } else {
            // Quote the value.
            if (!is_numeric($fieldValue)) {
                $fieldValue = $this->quoteString($fieldValue);
            }
        }

        return [$fieldName, $fieldValue];
    }
}

if (!PKP_STRICT_MODE) {
    class_alias('\PKP\db\DBDataXMLParser', '\DBDataXMLParser');
}

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