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<?php
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declare(strict_types=1);
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namespace OpenSpout\Reader\XLSX;
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use OpenSpout\Reader\Exception\NoSheetsFoundException;
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use OpenSpout\Reader\SheetIteratorInterface;
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use OpenSpout\Reader\XLSX\Manager\SheetManager;
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/**
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 * @implements SheetIteratorInterface<Sheet>
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 */
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final class SheetIterator implements SheetIteratorInterface
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{
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    /** @var Sheet[] The list of sheet present in the file */
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    private array $sheets;
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    /** @var int The index of the sheet being read (zero-based) */
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    private int $currentSheetIndex = 0;
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    /**
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     * @param SheetManager $sheetManager Manages sheets
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     *
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     * @throws NoSheetsFoundException If there are no sheets in the file
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     */
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    public function __construct(SheetManager $sheetManager)
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    {
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        // Fetch all available sheets
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        $this->sheets = $sheetManager->getSheets();
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        if (0 === \count($this->sheets)) {
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            throw new NoSheetsFoundException('The file must contain at least one sheet.');
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        }
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    }
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    /**
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     * Rewind the Iterator to the first element.
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     *
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     * @see http://php.net/manual/en/iterator.rewind.php
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     */
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    public function rewind(): void
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    {
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        $this->currentSheetIndex = 0;
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    }
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    /**
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     * Checks if current position is valid.
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     *
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     * @see http://php.net/manual/en/iterator.valid.php
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     */
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    public function valid(): bool
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    {
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        return $this->currentSheetIndex < \count($this->sheets);
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    }
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    /**
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     * Move forward to next element.
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     *
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     * @see http://php.net/manual/en/iterator.next.php
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     */
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    public function next(): void
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    {
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        ++$this->currentSheetIndex;
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    }
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    /**
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     * Return the current element.
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     *
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     * @see http://php.net/manual/en/iterator.current.php
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     */
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    public function current(): Sheet
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    {
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        return $this->sheets[$this->currentSheetIndex];
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    }
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    /**
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     * Return the key of the current element.
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     *
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     * @see http://php.net/manual/en/iterator.key.php
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     */
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    public function key(): int
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    {
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        return $this->currentSheetIndex + 1;
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    }
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}