<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * CSV import plugin for phpMyAdmin
 *
 * @todo       add an option for handling NULL values
 * @package    PhpMyAdmin-Import
 * @subpackage CSV
 */
if (! defined('PHPMYADMIN')) {
    exit;
}

/* Get the import interface */
require_once 'libraries/plugins/import/AbstractImportCsv.class.php';

/**
 * Handles the import for the CSV format
 *
 * @package    PhpMyAdmin-Import
 * @subpackage CSV
 */
class ImportCsv extends AbstractImportCsv
{
    /**
     * Whether to analyze tables
     *
     * @var bool
     */
    private $_analyze;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->setProperties();
    }

    /**
     * Sets the import plugin properties.
     * Called in the constructor.
     *
     * @return void
     */
    protected function setProperties()
    {
        $this->_setAnalyze(false);

        if ($GLOBALS['plugin_param'] !== 'table') {
            $this->_setAnalyze(true);
        }

        $generalOptions = parent::setProperties();
        $this->properties->setText('CSV');
        $this->properties->setExtension('csv');

        if ($GLOBALS['plugin_param'] !== 'table') {
            $leaf = new BoolPropertyItem();
            $leaf->setName("col_names");
            $leaf->setText(
                __(
                    'The first line of the file contains the table column names'
                    . ' <i>(if this is unchecked, the first line will become part'
                    . ' of the data)</i>'
                )
            );
            $generalOptions->addProperty($leaf);
        } else {
            $hint = new PMA_Message(
                __(
                    'If the data in each row of the file is not'
                    . ' in the same order as in the database, list the corresponding'
                    . ' column names here. Column names must be separated by commas'
                    . ' and not enclosed in quotations.'
                )
            );
            $leaf = new TextPropertyItem();
            $leaf->setName("columns");
            $leaf->setText(
                __('Column names: ')
                . PMA_Util::showHint($hint)
            );
            $generalOptions->addProperty($leaf);
        }

        $leaf = new BoolPropertyItem();
        $leaf->setName("ignore");
        $leaf->setText(__('Do not abort on INSERT error'));
        $generalOptions->addProperty($leaf);

    }

    /**
     * This method is called when any PluginManager to which the observer
     * is attached calls PluginManager::notify()
     *
     * @param SplSubject $subject The PluginManager notifying the observer
     *                            of an update.
     *
     * @return void
     */
    public function update (SplSubject $subject)
    {
    }

    /**
     * Handles the whole import logic
     *
     * @return void
     */
    public function doImport()
    {
        global $db, $table, $csv_terminated, $csv_enclosed, $csv_escaped,
            $csv_new_line, $csv_columns, $err_url;
        // $csv_replace and $csv_ignore should have been here,
        // but we use directly from $_POST
        global $error, $timeout_passed, $finished, $message;

        $replacements = array(
            '\\n'   => "\n",
            '\\t'   => "\t",
            '\\r'   => "\r",
        );
        $csv_terminated = strtr($csv_terminated, $replacements);
        $csv_enclosed = strtr($csv_enclosed,  $replacements);
        $csv_escaped = strtr($csv_escaped, $replacements);
        $csv_new_line = strtr($csv_new_line, $replacements);

        $param_error = false;
        if (strlen($csv_terminated) != 1) {
            $message = PMA_Message::error(
                __('Invalid parameter for CSV import: %s')
            );
            $message->addParam(__('Columns terminated with'), false);
            $error = true;
            $param_error = true;
            // The default dialog of MS Excel when generating a CSV produces a
            // semi-colon-separated file with no chance of specifying the
            // enclosing character. Thus, users who want to import this file
            // tend to remove the enclosing character on the Import dialog.
            // I could not find a test case where having no enclosing characters
            // confuses this script.
            // But the parser won't work correctly with strings so we allow just
            // one character.
        } elseif (strlen($csv_enclosed) > 1) {
            $message = PMA_Message::error(
                __('Invalid parameter for CSV import: %s')
            );
            $message->addParam(__('Columns enclosed with'), false);
            $error = true;
            $param_error = true;
        } elseif (strlen($csv_escaped) != 1) {
            $message = PMA_Message::error(
                __('Invalid parameter for CSV import: %s')
            );
            $message->addParam(__('Columns escaped with'), false);
            $error = true;
            $param_error = true;
        } elseif (strlen($csv_new_line) != 1 && $csv_new_line != 'auto') {
            $message = PMA_Message::error(
                __('Invalid parameter for CSV import: %s')
            );
            $message->addParam(__('Lines terminated with'), false);
            $error = true;
            $param_error = true;
        }

        // If there is an error in the parameters entered,
        // indicate that immediately.
        if ($param_error) {
            PMA_Util::mysqlDie($message->getMessage(), '', '', $err_url);
        }

        $buffer = '';
        $required_fields = 0;

        if (! $this->_getAnalyze()) {
            if (isset($_POST['csv_replace'])) {
                $sql_template = 'REPLACE';
            } else {
                $sql_template = 'INSERT';
                if (isset($_POST['csv_ignore'])) {
                    $sql_template .= ' IGNORE';
                }
            }
            $sql_template .= ' INTO ' . PMA_Util::backquote($table);

            $tmp_fields = $GLOBALS['dbi']->getColumns($db, $table);

            if (empty($csv_columns)) {
                $fields = $tmp_fields;
            } else {
                $sql_template .= ' (';
                $fields = array();
                $tmp   = preg_split('/,( ?)/', $csv_columns);
                foreach ($tmp as $key => $val) {
                    if (count($fields) > 0) {
                        $sql_template .= ', ';
                    }
                    /* Trim also `, if user already included backquoted fields */
                    $val = trim($val, " \t\r\n\0\x0B`");
                    $found = false;
                    foreach ($tmp_fields as $field) {
                        if ($field['Field'] == $val) {
                            $found = true;
                            break;
                        }
                    }
                    if (! $found) {
                        $message = PMA_Message::error(
                            __(
                                'Invalid column (%s) specified! Ensure that columns'
                                . ' names are spelled correctly, separated by commas'
                                . ', and not enclosed in quotes.'
                            )
                        );
                        $message->addParam($val);
                        $error = true;
                        break;
                    }
                    $fields[] = $field;
                    $sql_template .= PMA_Util::backquote($val);
                }
                $sql_template .= ') ';
            }

            $required_fields = count($fields);

            $sql_template .= ' VALUES (';
        }

        // Defaults for parser
        $i = 0;
        $len = 0;
        $lastlen = null;
        $line = 1;
        $lasti = -1;
        $values = array();
        $csv_finish = false;

        $tempRow = array();
        $rows = array();
        $col_names = array();
        $tables = array();

        $col_count = 0;
        $max_cols = 0;

        while (! ($finished && $i >= $len) && ! $error && ! $timeout_passed) {
            $data = PMA_importGetNextChunk();
            if ($data === false) {
                // subtract data we didn't handle yet and stop processing
                $GLOBALS['offset'] -= strlen($buffer);
                break;
            } elseif ($data === true) {
                // Handle rest of buffer
            } else {
                // Append new data to buffer
                $buffer .= $data;
                unset($data);
                
                // Force a trailing new line at EOF to prevent parsing problems
                if ($finished && $buffer) {
                    $finalch = substr($buffer, -1);
                    if ($csv_new_line == 'auto'
                        && $finalch != "\r"
                        && $finalch != "\n"
                    ) {
                        $buffer .= "\n";
                    } elseif ($csv_new_line != 'auto' 
                        && $finalch != $csv_new_line
                    ) {
                        $buffer .= $csv_new_line;
                    }
                }
                
                // Do not parse string when we're not at the end
                // and don't have new line inside
                if (($csv_new_line == 'auto'
                    && strpos($buffer, "\r") === false
                    && strpos($buffer, "\n") === false)
                    || ($csv_new_line != 'auto'
                    && strpos($buffer, $csv_new_line) === false)
                ) {
                    continue;
                }
            }

            // Current length of our buffer
            $len = strlen($buffer);
            // Currently parsed char
            $ch = $buffer[$i];
            while ($i < $len) {
                // Deadlock protection
                if ($lasti == $i && $lastlen == $len) {
                    $message = PMA_Message::error(
                        __('Invalid format of CSV input on line %d.')
                    );
                    $message->addParam($line);
                    $error = true;
                    break;
                }
                $lasti = $i;
                $lastlen = $len;

                // This can happen with auto EOL and \r at the end of buffer
                if (! $csv_finish) {
                    // Grab empty field
                    if ($ch == $csv_terminated) {
                        if ($i == $len - 1) {
                            break;
                        }
                        $values[] = '';
                        $i++;
                        $ch = $buffer[$i];
                        continue;
                    }

                    // Grab one field
                    $fallbacki = $i;
                    if ($ch == $csv_enclosed) {
                        if ($i == $len - 1) {
                            break;
                        }
                        $need_end = true;
                        $i++;
                        $ch = $buffer[$i];
                    } else {
                        $need_end = false;
                    }
                    $fail = false;
                    $value = '';
                    while (($need_end
                        && ( $ch != $csv_enclosed || $csv_enclosed == $csv_escaped ))
                        || ( ! $need_end
                        && ! ( $ch == $csv_terminated
                        || $ch == $csv_new_line
                        || ( $csv_new_line == 'auto'
                        && ( $ch == "\r" || $ch == "\n" ) ) ) )
                    ) {
                        if ($ch == $csv_escaped) {
                            if ($i == $len - 1) {
                                $fail = true;
                                break;
                            }
                            $i++;
                            $ch = $buffer[$i];
                            if ($csv_enclosed == $csv_escaped
                                && ($ch == $csv_terminated
                                || $ch == $csv_new_line
                                || ($csv_new_line == 'auto'
                                && ($ch == "\r" || $ch == "\n")))
                            ) {
                                break;
                            }
                        }
                        $value .= $ch;
                        if ($i == $len - 1) {
                            if (! $finished) {
                                $fail = true;
                            }
                            break;
                        }
                        $i++;
                        $ch = $buffer[$i];
                    }

                    // unquoted NULL string
                    if (false === $need_end && $value === 'NULL') {
                        $value = null;
                    }

                    if ($fail) {
                        $i = $fallbacki;
                        $ch = $buffer[$i];
                        break;
                    }
                    // Need to strip trailing enclosing char?
                    if ($need_end && $ch == $csv_enclosed) {
                        if ($finished && $i == $len - 1) {
                            $ch = null;
                        } elseif ($i == $len - 1) {
                            $i = $fallbacki;
                            $ch = $buffer[$i];
                            break;
                        } else {
                            $i++;
                            $ch = $buffer[$i];
                        }
                    }
                    // Are we at the end?
                    if ($ch == $csv_new_line
                        || ($csv_new_line == 'auto' && ($ch == "\r" || $ch == "\n"))
                        || ($finished && $i == $len - 1)
                    ) {
                        $csv_finish = true;
                    }
                    // Go to next char
                    if ($ch == $csv_terminated) {
                        if ($i == $len - 1) {
                            $i = $fallbacki;
                            $ch = $buffer[$i];
                            break;
                        }
                        $i++;
                        $ch = $buffer[$i];
                    }
                    // If everything went okay, store value
                    $values[] = $value;
                }

                // End of line
                if ($csv_finish
                    || $ch == $csv_new_line
                    || ($csv_new_line == 'auto' && ($ch == "\r" || $ch == "\n"))
                ) {
                    if ($csv_new_line == 'auto' && $ch == "\r") { // Handle "\r\n"
                        if ($i >= ($len - 2) && ! $finished) {
                            break; // We need more data to decide new line
                        }
                        if ($buffer[$i + 1] == "\n") {
                            $i++;
                        }
                    }
                    // We didn't parse value till the end of line, so there was
                    // empty one
                    if (! $csv_finish) {
                        $values[] = '';
                    }

                    if ($this->_getAnalyze()) {
                        foreach ($values as $val) {
                            $tempRow[] = $val;
                            ++$col_count;
                        }

                        if ($col_count > $max_cols) {
                            $max_cols = $col_count;
                        }
                        $col_count = 0;

                        $rows[] = $tempRow;
                        $tempRow = array();
                    } else {
                        // Do we have correct count of values?
                        if (count($values) != $required_fields) {

                            // Hack for excel
                            if ($values[count($values) - 1] == ';') {
                                unset($values[count($values) - 1]);
                            } else {
                                $message = PMA_Message::error(
                                    __(
                                        'Invalid column count in CSV input'
                                        . ' on line %d.'
                                    )
                                );
                                $message->addParam($line);
                                $error = true;
                                break;
                            }
                        }

                        $first = true;
                        $sql = $sql_template;
                        foreach ($values as $key => $val) {
                            if (! $first) {
                                $sql .= ', ';
                            }
                            if ($val === null) {
                                $sql .= 'NULL';
                            } else {
                                $sql .= '\''
                                    . PMA_Util::sqlAddSlashes($val)
                                    . '\'';
                            }

                            $first = false;
                        }
                        $sql .= ')';

                        /**
                         * @todo maybe we could add original line to verbose
                         * SQL in comment
                         */
                        PMA_importRunQuery($sql, $sql);
                    }

                    $line++;
                    $csv_finish = false;
                    $values = array();
                    $buffer = substr($buffer, $i + 1);
                    $len = strlen($buffer);
                    $i = 0;
                    $lasti = -1;
                    $ch = $buffer[0];
                }
            } // End of parser loop
        } // End of import loop

        if ($this->_getAnalyze()) {
            /* Fill out all rows */
            $num_rows = count($rows);
            for ($i = 0; $i < $num_rows; ++$i) {
                for ($j = count($rows[$i]); $j < $max_cols; ++$j) {
                    $rows[$i][] = 'NULL';
                }
            }

            if (isset($_REQUEST['csv_col_names'])) {
                $col_names = array_splice($rows, 0, 1);
                $col_names = $col_names[0];
            }

            if ((isset($col_names) && count($col_names) != $max_cols)
                || ! isset($col_names)
            ) {
                // Fill out column names
                for ($i = 0; $i < $max_cols; ++$i) {
                    $col_names[] = 'COL '.($i+1);
                }
            }

            if (strlen($db)) {
                $result = $GLOBALS['dbi']->fetchResult('SHOW TABLES');
                $tbl_name = 'TABLE '.(count($result) + 1);
            } else {
                $tbl_name = 'TBL_NAME';
            }

            $tables[] = array($tbl_name, $col_names, $rows);

            /* Obtain the best-fit MySQL types for each column */
            $analyses = array();
            $analyses[] = PMA_analyzeTable($tables[0]);

            /**
             * string $db_name (no backquotes)
             *
             * array $table = array(table_name, array() column_names, array()() rows)
             * array $tables = array of "$table"s
             *
             * array $analysis = array(array() column_types, array() column_sizes)
             * array $analyses = array of "$analysis"s
             *
             * array $create = array of SQL strings
             *
             * array $options = an associative array of options
             */

            /* Set database name to the currently selected one, if applicable */
            if (strlen($db)) {
                $db_name = $db;
                $options = array('create_db' => false);
            } else {
                $db_name = 'CSV_DB';
                $options = null;
            }

            /* Non-applicable parameters */
            $create = null;

            /* Created and execute necessary SQL statements from data */
            PMA_buildSQL($db_name, $tables, $analyses, $create, $options);

            unset($tables);
            unset($analyses);
        }

        // Commit any possible data in buffers
        PMA_importRunQuery();

        if (count($values) != 0 && ! $error) {
            $message = PMA_Message::error(
                __('Invalid format of CSV input on line %d.')
            );
            $message->addParam($line);
            $error = true;
        }
    }


    /* ~~~~~~~~~~~~~~~~~~~~ Getters and Setters ~~~~~~~~~~~~~~~~~~~~ */


    /**
     * Returns true if the table should be analyzed, false otherwise
     *
     * @return bool
     */
    private function _getAnalyze()
    {
        return $this->_analyze;
    }

    /**
     * Sets to true if the table should be analyzed, false otherwise
     *
     * @param bool $analyze status
     *
     * @return void
     */
    private function _setAnalyze($analyze)
    {
        $this->_analyze = $analyze;
    }
}