<?php

namespace LWVendor\PhpOffice\PhpSpreadsheet\Worksheet;

use LWVendor\PhpOffice\PhpSpreadsheet\Cell\Cell;
use LWVendor\PhpOffice\PhpSpreadsheet\Cell\Coordinate;
use LWVendor\PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
/**
 * @extends CellIterator<int>
 */
class ColumnCellIterator extends CellIterator
{
    /**
     * Current iterator position.
     *
     * @var int
     */
    private $currentRow;
    /**
     * Column index.
     *
     * @var int
     */
    private $columnIndex;
    /**
     * Start position.
     *
     * @var int
     */
    private $startRow = 1;
    /**
     * End position.
     *
     * @var int
     */
    private $endRow = 1;
    /**
     * Create a new row iterator.
     *
     * @param Worksheet $worksheet The worksheet to iterate over
     * @param string $columnIndex The column that we want to iterate
     * @param int $startRow The row number at which to start iterating
     * @param int $endRow Optionally, the row number at which to stop iterating
     */
    public function __construct(Worksheet $worksheet, $columnIndex = 'A', $startRow = 1, $endRow = null)
    {
        // Set subject
        $this->worksheet = $worksheet;
        $this->cellCollection = $worksheet->getCellCollection();
        $this->columnIndex = Coordinate::columnIndexFromString($columnIndex);
        $this->resetEnd($endRow);
        $this->resetStart($startRow);
    }
    /**
     * (Re)Set the start row and the current row pointer.
     *
     * @param int $startRow The row number at which to start iterating
     *
     * @return $this
     */
    public function resetStart(int $startRow = 1)
    {
        $this->startRow = $startRow;
        $this->adjustForExistingOnlyRange();
        $this->seek($startRow);
        return $this;
    }
    /**
     * (Re)Set the end row.
     *
     * @param int $endRow The row number at which to stop iterating
     *
     * @return $this
     */
    public function resetEnd($endRow = null)
    {
        $this->endRow = $endRow ?: $this->worksheet->getHighestRow();
        $this->adjustForExistingOnlyRange();
        return $this;
    }
    /**
     * Set the row pointer to the selected row.
     *
     * @param int $row The row number to set the current pointer at
     *
     * @return $this
     */
    public function seek(int $row = 1)
    {
        if ($this->onlyExistingCells && !$this->cellCollection->has(Coordinate::stringFromColumnIndex($this->columnIndex) . $row)) {
            throw new PhpSpreadsheetException('In "IterateOnlyExistingCells" mode and Cell does not exist');
        }
        if ($row < $this->startRow || $row > $this->endRow) {
            throw new PhpSpreadsheetException("Row {$row} is out of range ({$this->startRow} - {$this->endRow})");
        }
        $this->currentRow = $row;
        return $this;
    }
    /**
     * Rewind the iterator to the starting row.
     */
    public function rewind() : void
    {
        $this->currentRow = $this->startRow;
    }
    /**
     * Return the current cell in this worksheet column.
     */
    public function current() : ?Cell
    {
        $cellAddress = Coordinate::stringFromColumnIndex($this->columnIndex) . $this->currentRow;
        return $this->cellCollection->has($cellAddress) ? $this->cellCollection->get($cellAddress) : ($this->ifNotExists === self::IF_NOT_EXISTS_CREATE_NEW ? $this->worksheet->createNewCell($cellAddress) : null);
    }
    /**
     * Return the current iterator key.
     */
    public function key() : int
    {
        return $this->currentRow;
    }
    /**
     * Set the iterator to its next value.
     */
    public function next() : void
    {
        $columnAddress = Coordinate::stringFromColumnIndex($this->columnIndex);
        do {
            ++$this->currentRow;
        } while ($this->onlyExistingCells && $this->currentRow <= $this->endRow && !$this->cellCollection->has($columnAddress . $this->currentRow));
    }
    /**
     * Set the iterator to its previous value.
     */
    public function prev() : void
    {
        $columnAddress = Coordinate::stringFromColumnIndex($this->columnIndex);
        do {
            --$this->currentRow;
        } while ($this->onlyExistingCells && $this->currentRow >= $this->startRow && !$this->cellCollection->has($columnAddress . $this->currentRow));
    }
    /**
     * Indicate if more rows exist in the worksheet range of rows that we're iterating.
     */
    public function valid() : bool
    {
        return $this->currentRow <= $this->endRow && $this->currentRow >= $this->startRow;
    }
    /**
     * Validate start/end values for "IterateOnlyExistingCells" mode, and adjust if necessary.
     */
    protected function adjustForExistingOnlyRange() : void
    {
        if ($this->onlyExistingCells) {
            $columnAddress = Coordinate::stringFromColumnIndex($this->columnIndex);
            while (!$this->cellCollection->has($columnAddress . $this->startRow) && $this->startRow <= $this->endRow) {
                ++$this->startRow;
            }
            while (!$this->cellCollection->has($columnAddress . $this->endRow) && $this->endRow >= $this->startRow) {
                --$this->endRow;
            }
        }
    }
}
