<?php

namespace App\Actions\ProjectBoard;

use App\Models\BoardColumn;
use App\Models\Project;
use Illuminate\Support\Collection;

trait ReordersBoardColumns
{
    private function normalizeColumnPositions(Project $project): void
    {
        $this->persistOrderedColumns(
            $project->boardColumns()
                ->get()
                ->values(),
        );
    }

    private function reorderColumns(Project $project, BoardColumn $movingColumn, int $desiredPosition): void
    {
        /** @var Collection<int, BoardColumn> $columns */
        $columns = $project->boardColumns()
            ->whereKeyNot($movingColumn->id)
            ->get()
            ->values();

        $insertAt = max(0, min($desiredPosition - 1, $columns->count()));

        $columns->splice($insertAt, 0, [$movingColumn]);

        $this->persistOrderedColumns($columns->values());
    }

    /**
     * @param  Collection<int, BoardColumn>  $columns
     */
    private function persistOrderedColumns(Collection $columns): void
    {
        $temporaryOffset = ((int) $columns->max('position')) + $columns->count() + 1;

        $columns->each(function (BoardColumn $column, int $index) use ($temporaryOffset): void {
            $column->forceFill([
                'position' => $temporaryOffset + $index,
            ])->saveQuietly();
        });

        $columns->each(function (BoardColumn $column, int $index): void {
            $column->forceFill([
                'position' => $index + 1,
            ])->saveQuietly();
        });
    }
}