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<?php

namespace PhpOffice\PhpSpreadsheet\Reader;

use PhpOffice\PhpSpreadsheet\Calculation\Calculation;

use PhpOffice\PhpSpreadsheet\Cell\Cell;

use PhpOffice\PhpSpreadsheet\Cell\Coordinate;

use PhpOffice\PhpSpreadsheet\Reader\Csv\Delimiter;

use PhpOffice\PhpSpreadsheet\Reader\Exception as ReaderException;

use PhpOffice\PhpSpreadsheet\Shared\StringHelper;

use PhpOffice\PhpSpreadsheet\Spreadsheet;

use PhpOffice\PhpSpreadsheet\Style\NumberFormat;

class Csv extends BaseReader

{

    const DEFAULT_FALLBACK_ENCODING = 'CP1252';

    const GUESS_ENCODING = 'guess';

    const UTF8_BOM = "\xEF\xBB\xBF";

    const UTF8_BOM_LEN = 3;

    const UTF16BE_BOM = "\xfe\xff";

    const UTF16BE_BOM_LEN = 2;

    const UTF16BE_LF = "\x00\x0a";

    const UTF16LE_BOM = "\xff\xfe";

    const UTF16LE_BOM_LEN = 2;

    const UTF16LE_LF = "\x0a\x00";

    const UTF32BE_BOM = "\x00\x00\xfe\xff";

    const UTF32BE_BOM_LEN = 4;

    const UTF32BE_LF = "\x00\x00\x00\x0a";

    const UTF32LE_BOM = "\xff\xfe\x00\x00";

    const UTF32LE_BOM_LEN = 4;

    const UTF32LE_LF = "\x0a\x00\x00\x00";

    /**

     * Input encoding.

     *

     * @var string

     */

    private $inputEncoding = 'UTF-8';

    /**

     * Fallback encoding if guess strikes out.

     *

     * @var string

     */

    private $fallbackEncoding = self::DEFAULT_FALLBACK_ENCODING;

    /**

     * Delimiter.

     *

     * @var ?string

     */

    private $delimiter;

    /**

     * Enclosure.

     *

     * @var string

     */

    private $enclosure = '"';

    /**

     * Sheet index to read.

     *

     * @var int

     */

    private $sheetIndex = 0;

    /**

     * Load rows contiguously.

     *

     * @var bool

     */

    private $contiguous = false;

    /**

     * The character that can escape the enclosure.

     *

     * @var string

     */

    private $escapeCharacter = '\\';

    /**

     * Callback for setting defaults in construction.

     *

     * @var ?callable

     */

    private static $constructorCallback;

    /**

     * Attempt autodetect line endings (deprecated after PHP8.1)?

     *

     * @var bool

     */

    private $testAutodetect = true;

    /**

     * @var bool

     */

    protected $castFormattedNumberToNumeric = false;

    /**

     * @var bool

     */

    protected $preserveNumericFormatting = false;

    /** @var bool */

    private $preserveNullString = false;

    /**

     * Create a new CSV Reader instance.

     */

    public function __construct()

    {

        parent::__construct();

        $callback = self::$constructorCallback;

        if ($callback !== null) {

            $callback($this);

        }

    }

    /**

     * Set a callback to change the defaults.

     *

     * The callback must accept the Csv Reader object as the first parameter,

     * and it should return void.

     */

    public static function setConstructorCallback(?callable $callback): void

    {

        self::$constructorCallback = $callback;

    }

    public static function getConstructorCallback(): ?callable

    {

        return self::$constructorCallback;

    }

    public function setInputEncoding(string $encoding): self

    {

        $this->inputEncoding = $encoding;

        return $this;

    }

    public function getInputEncoding(): string

    {

        return $this->inputEncoding;

    }

    public function setFallbackEncoding(string $fallbackEncoding): self

    {

        $this->fallbackEncoding = $fallbackEncoding;

        return $this;

    }

    public function getFallbackEncoding(): string

    {

        return $this->fallbackEncoding;

    }

    /**

     * Move filepointer past any BOM marker.

     */

    protected function skipBOM(): void

    {

        rewind($this->fileHandle);

        if (fgets($this->fileHandle, self::UTF8_BOM_LEN + 1) !== self::UTF8_BOM) {

            rewind($this->fileHandle);

        }

    }

    /**

     * Identify any separator that is explicitly set in the file.

     */

    protected function checkSeparator(): void

    {

        $line = fgets($this->fileHandle);

        if ($line === false) {

            return;

        }

        if ((strlen(trim($line, "\r\n")) == 5) && (stripos($line, 'sep=') === 0)) {

            $this->delimiter = substr($line, 4, 1);

            return;

        }

        $this->skipBOM();

    }

    /**

     * Infer the separator if it isn't explicitly set in the file or specified by the user.

     */

    protected function inferSeparator(): void

    {

        if ($this->delimiter !== null) {

            return;

        }

        $inferenceEngine = new Delimiter($this->fileHandle, $this->escapeCharacter, $this->enclosure);

        // If number of lines is 0, nothing to infer : fall back to the default

        if ($inferenceEngine->linesCounted() === 0) {

            $this->delimiter = $inferenceEngine->getDefaultDelimiter();

            $this->skipBOM();

            return;

        }

        $this->delimiter = $inferenceEngine->infer();

        // If no delimiter could be detected, fall back to the default

        if ($this->delimiter === null) {

            $this->delimiter = $inferenceEngine->getDefaultDelimiter();

        }

        $this->skipBOM();

    }

    /**

     * Return worksheet info (Name, Last Column Letter, Last Column Index, Total Rows, Total Columns).

     */

    public function listWorksheetInfo(string $filename): array

    {

        // Open file

        $this->openFileOrMemory($filename);

        $fileHandle = $this->fileHandle;

        // Skip BOM, if any

        $this->skipBOM();

        $this->checkSeparator();

        $this->inferSeparator();

        $worksheetInfo = [];

        $worksheetInfo[0]['worksheetName'] = 'Worksheet';

        $worksheetInfo[0]['lastColumnLetter'] = 'A';

        $worksheetInfo[0]['lastColumnIndex'] = 0;

        $worksheetInfo[0]['totalRows'] = 0;

        $worksheetInfo[0]['totalColumns'] = 0;

        // Loop through each line of the file in turn

        $rowData = fgetcsv($fileHandle, 0, $this->delimiter ?? '', $this->enclosure, $this->escapeCharacter);

        while (is_array($rowData)) {

            ++$worksheetInfo[0]['totalRows'];

            $worksheetInfo[0]['lastColumnIndex'] = max($worksheetInfo[0]['lastColumnIndex'], count($rowData) - 1);

            $rowData = fgetcsv($fileHandle, 0, $this->delimiter ?? '', $this->enclosure, $this->escapeCharacter);

        }

        $worksheetInfo[0]['lastColumnLetter'] = Coordinate::stringFromColumnIndex($worksheetInfo[0]['lastColumnIndex'] + 1);

        $worksheetInfo[0]['totalColumns'] = $worksheetInfo[0]['lastColumnIndex'] + 1;

        // Close file

        fclose($fileHandle);

        return $worksheetInfo;

    }

    /**

     * Loads Spreadsheet from file.

     */

    protected function loadSpreadsheetFromFile(string $filename): Spreadsheet

    {

        // Create new Spreadsheet

        $spreadsheet = new Spreadsheet();

        // Load into this instance

        return $this->loadIntoExisting($filename, $spreadsheet);

    }

    /**

     * Loads Spreadsheet from string.

     */

    public function loadSpreadsheetFromString(string $contents): Spreadsheet

    {

        // Create new Spreadsheet

        $spreadsheet = new Spreadsheet();

        // Load into this instance

        return $this->loadStringOrFile('data://text/plain,' . urlencode($contents), $spreadsheet, true);

    }

    private function openFileOrMemory(string $filename): void

    {

        // Open file

        $fhandle = $this->canRead($filename);

        if (!$fhandle) {

            throw new Exception($filename . ' is an Invalid Spreadsheet file.');

        }

        if ($this->inputEncoding === self::GUESS_ENCODING) {

            $this->inputEncoding = self::guessEncoding($filename, $this->fallbackEncoding);

        }

        $this->openFile($filename);

        if ($this->inputEncoding !== 'UTF-8') {

            fclose($this->fileHandle);

            $entireFile = file_get_contents($filename);

            $fileHandle = fopen('php://memory', 'r+b');

            if ($fileHandle !== false && $entireFile !== false) {

                $this->fileHandle = $fileHandle;

                $data = StringHelper::convertEncoding($entireFile, 'UTF-8', $this->inputEncoding);

                fwrite($this->fileHandle, $data);

                $this->skipBOM();

            }

        }

    }

    public function setTestAutoDetect(bool $value): self

    {

        $this->testAutodetect = $value;

        return $this;

    }

    private function setAutoDetect(?string $value): ?string

    {

        $retVal = null;

        if ($value !== null && $this->testAutodetect) {

            $retVal2 = @ini_set('auto_detect_line_endings', $value);

            if (is_string($retVal2)) {

                $retVal = $retVal2;

            }

        }

        return $retVal;

    }

    public function castFormattedNumberToNumeric(

        bool $castFormattedNumberToNumeric,

        bool $preserveNumericFormatting = false

    ): void {

        $this->castFormattedNumberToNumeric = $castFormattedNumberToNumeric;

        $this->preserveNumericFormatting = $preserveNumericFormatting;

    }

    /**

     * Open data uri for reading.

     */

    private function openDataUri(string $filename): void

    {

        $fileHandle = fopen($filename, 'rb');

        if ($fileHandle === false) {

            // @codeCoverageIgnoreStart

            throw new ReaderException('Could not open file ' . $filename . ' for reading.');

            // @codeCoverageIgnoreEnd

        }

        $this->fileHandle = $fileHandle;

    }

    /**

     * Loads PhpSpreadsheet from file into PhpSpreadsheet instance.

     */

    public function loadIntoExisting(string $filename, Spreadsheet $spreadsheet): Spreadsheet

    {

        return $this->loadStringOrFile($filename, $spreadsheet, false);

    }

    /**

     * Loads PhpSpreadsheet from file into PhpSpreadsheet instance.

     */

    private function loadStringOrFile(string $filename, Spreadsheet $spreadsheet, bool $dataUri): Spreadsheet

    {

        // Deprecated in Php8.1

        $iniset = $this->setAutoDetect('1');

        // Open file

        if ($dataUri) {

            $this->openDataUri($filename);

        } else {

            $this->openFileOrMemory($filename);

        }

        $fileHandle = $this->fileHandle;

        // Skip BOM, if any

        $this->skipBOM();

        $this->checkSeparator();

        $this->inferSeparator();

        // Create new PhpSpreadsheet object

        while ($spreadsheet->getSheetCount() <= $this->sheetIndex) {

            $spreadsheet->createSheet();

        }

        $sheet = $spreadsheet->setActiveSheetIndex($this->sheetIndex);

        // Set our starting row based on whether we're in contiguous mode or not

        $currentRow = 1;

        $outRow = 0;

        // Loop through each line of the file in turn

        $rowData = fgetcsv($fileHandle, 0, $this->delimiter ?? '', $this->enclosure, $this->escapeCharacter);

        $valueBinder = Cell::getValueBinder();

        $preserveBooleanString = method_exists($valueBinder, 'getBooleanConversion') && $valueBinder->getBooleanConversion();

        while (is_array($rowData)) {

            $noOutputYet = true;

            $columnLetter = 'A';

            foreach ($rowData as $rowDatum) {

                $this->convertBoolean($rowDatum, $preserveBooleanString);

                $numberFormatMask = $this->convertFormattedNumber($rowDatum);

                if (($rowDatum !== '' || $this->preserveNullString) && $this->readFilter->readCell($columnLetter, $currentRow)) {

                    if ($this->contiguous) {

                        if ($noOutputYet) {

                            $noOutputYet = false;

                            ++$outRow;

                        }

                    } else {

                        $outRow = $currentRow;

                    }

                    // Set basic styling for the value (Note that this could be overloaded by styling in a value binder)

                    $sheet->getCell($columnLetter . $outRow)->getStyle()

                        ->getNumberFormat()

                        ->setFormatCode($numberFormatMask);

                    // Set cell value

                    $sheet->getCell($columnLetter . $outRow)->setValue($rowDatum);

                }

                ++$columnLetter;

            }

            $rowData = fgetcsv($fileHandle, 0, $this->delimiter ?? '', $this->enclosure, $this->escapeCharacter);

            ++$currentRow;

        }

        // Close file

        fclose($fileHandle);

        $this->setAutoDetect($iniset);

        // Return

        return $spreadsheet;

    }

    /**

     * Convert string true/false to boolean, and null to null-string.

     *

     * @param mixed $rowDatum

     */

    private function convertBoolean(&$rowDatum, bool $preserveBooleanString): void

    {

        if (is_string($rowDatum) && !$preserveBooleanString) {

            if (strcasecmp(Calculation::getTRUE(), $rowDatum) === 0 || strcasecmp('true', $rowDatum) === 0) {

                $rowDatum = true;

            } elseif (strcasecmp(Calculation::getFALSE(), $rowDatum) === 0 || strcasecmp('false', $rowDatum) === 0) {

                $rowDatum = false;

            }

        } else {

            $rowDatum = $rowDatum ?? '';

        }

    }

    /**

     * Convert numeric strings to int or float values.

     *

     * @param mixed $rowDatum

     */

    private function convertFormattedNumber(&$rowDatum): string

    {

        $numberFormatMask = NumberFormat::FORMAT_GENERAL;

        if ($this->castFormattedNumberToNumeric === true && is_string($rowDatum)) {

            $numeric = str_replace(

                [StringHelper::getThousandsSeparator(), StringHelper::getDecimalSeparator()],

                ['', '.'],

                $rowDatum

            );

            if (is_numeric($numeric)) {

                $decimalPos = strpos($rowDatum, StringHelper::getDecimalSeparator());

                if ($this->preserveNumericFormatting === true) {

                    $numberFormatMask = (strpos($rowDatum, StringHelper::getThousandsSeparator()) !== false)

                        ? '#,##0' : '0';

                    if ($decimalPos !== false) {

                        $decimals = strlen($rowDatum) - $decimalPos - 1;

                        $numberFormatMask .= '.' . str_repeat('0', min($decimals, 6));

                    }

                }

                $rowDatum = ($decimalPos !== false) ? (float) $numeric : (int) $numeric;

            }

        }

        return $numberFormatMask;

    }

    public function getDelimiter(): ?string

    {

        return $this->delimiter;

    }

    public function setDelimiter(?string $delimiter): self

    {

        $this->delimiter = $delimiter;

        return $this;

    }

    public function getEnclosure(): string

    {

        return $this->enclosure;

    }

    public function setEnclosure(string $enclosure): self

    {

        if ($enclosure == '') {

            $enclosure = '"';

        }

        $this->enclosure = $enclosure;

        return $this;

    }

    public function getSheetIndex(): int

    {

        return $this->sheetIndex;

    }

    public function setSheetIndex(int $indexValue): self

    {

        $this->sheetIndex = $indexValue;

        return $this;

    }

    public function setContiguous(bool $contiguous): self

    {

        $this->contiguous = $contiguous;

        return $this;

    }

    public function getContiguous(): bool

    {

        return $this->contiguous;

    }

    public function setEscapeCharacter(string $escapeCharacter): self

    {

        $this->escapeCharacter = $escapeCharacter;

        return $this;

    }

    public function getEscapeCharacter(): string

    {

        return $this->escapeCharacter;

    }

    /**

     * Can the current IReader read the file?

     */

    public function canRead(string $filename): bool

    {

        // Check if file exists

        try {

            $this->openFile($filename);

        } catch (ReaderException $e) {

            return false;

        }

        fclose($this->fileHandle);

        // Trust file extension if any

        $extension = strtolower(/** @scrutinizer ignore-type */ pathinfo($filename, PATHINFO_EXTENSION));

        if (in_array($extension, ['csv', 'tsv'])) {

            return true;

        }

        // Attempt to guess mimetype

        $type = mime_content_type($filename);

        $supportedTypes = [

            'application/csv',

            'text/csv',

            'text/plain',

            'inode/x-empty',

        ];

        return in_array($type, $supportedTypes, true);

    }

    private static function guessEncodingTestNoBom(string &$encoding, string &$contents, string $compare, string $setEncoding): void

    {

        if ($encoding === '') {

            $pos = strpos($contents, $compare);

            if ($pos !== false && $pos % strlen($compare) === 0) {

                $encoding = $setEncoding;

            }

        }

    }

    private static function guessEncodingNoBom(string $filename): string

    {

        $encoding = '';

        $contents = file_get_contents($filename);

        self::guessEncodingTestNoBom($encoding, $contents, self::UTF32BE_LF, 'UTF-32BE');

        self::guessEncodingTestNoBom($encoding, $contents, self::UTF32LE_LF, 'UTF-32LE');

        self::guessEncodingTestNoBom($encoding, $contents, self::UTF16BE_LF, 'UTF-16BE');

        self::guessEncodingTestNoBom($encoding, $contents, self::UTF16LE_LF, 'UTF-16LE');

        if ($encoding === '' && preg_match('//u', $contents) === 1) {

            $encoding = 'UTF-8';

        }

        return $encoding;

    }

    private static function guessEncodingTestBom(string &$encoding, string $first4, string $compare, string $setEncoding): void

    {

        if ($encoding === '') {

            if ($compare === substr($first4, 0, strlen($compare))) {

                $encoding = $setEncoding;

            }

        }

    }

    private static function guessEncodingBom(string $filename): string

    {

        $encoding = '';

        $first4 = file_get_contents($filename, false, null, 0, 4);

        if ($first4 !== false) {

            self::guessEncodingTestBom($encoding, $first4, self::UTF8_BOM, 'UTF-8');

            self::guessEncodingTestBom($encoding, $first4, self::UTF16BE_BOM, 'UTF-16BE');

            self::guessEncodingTestBom($encoding, $first4, self::UTF32BE_BOM, 'UTF-32BE');

            self::guessEncodingTestBom($encoding, $first4, self::UTF32LE_BOM, 'UTF-32LE');

            self::guessEncodingTestBom($encoding, $first4, self::UTF16LE_BOM, 'UTF-16LE');

        }

        return $encoding;

    }

    public static function guessEncoding(string $filename, string $dflt = self::DEFAULT_FALLBACK_ENCODING): string

    {

        $encoding = self::guessEncodingBom($filename);

        if ($encoding === '') {

            $encoding = self::guessEncodingNoBom($filename);

        }

        return ($encoding === '') ? $dflt : $encoding;

    }

    public function setPreserveNullString(bool $value): self

    {

        $this->preserveNullString = $value;

        return $this;

    }

    public function getPreserveNullString(): bool

    {

        return $this->preserveNullString;

    }

}