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<?php
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/**
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 *
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 * Class for the creating "special" Matrices
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 *
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 * @copyright  Copyright (c) 2018 Mark Baker (https://github.com/MarkBaker/PHPMatrix)
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 * @license    https://opensource.org/licenses/MIT    MIT
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 */
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namespace Matrix;
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/**
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 * Matrix Builder class.
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 *
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 * @package Matrix
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 */
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class Builder
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{
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    /**
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     * Create a new matrix of specified dimensions, and filled with a specified value
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     * If the column argument isn't provided, then a square matrix will be created
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     *
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     * @param mixed $fillValue
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     * @param int $rows
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     * @param int|null $columns
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     * @return Matrix
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     * @throws Exception
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     */
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    public static function createFilledMatrix($fillValue, $rows, $columns = null)
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    {
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        if ($columns === null) {
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            $columns = $rows;
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        }
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        $rows = Matrix::validateRow($rows);
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        $columns = Matrix::validateColumn($columns);
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        return new Matrix(
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            array_fill(
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                0,
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                $rows,
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                array_fill(
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                    0,
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                    $columns,
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                    $fillValue
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                )
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            )
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        );
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    }
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    /**
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     * Create a new identity matrix of specified dimensions
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     * This will always be a square matrix, with the number of rows and columns matching the provided dimension
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     *
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     * @param int $dimensions
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     * @return Matrix
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     * @throws Exception
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     */
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    public static function createIdentityMatrix($dimensions, $fillValue = null)
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    {
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        $grid = static::createFilledMatrix($fillValue, $dimensions)->toArray();
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        for ($x = 0; $x < $dimensions; ++$x) {
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            $grid[$x][$x] = 1;
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        }
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        return new Matrix($grid);
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    }
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}