import 'package:flutter/material.dart';
import '../utils/grid_size_calculator.dart';
import '../utils/layout_constants.dart';

/// Shared grid delegate configuration for media item grids
/// Maintains consistent spacing (2/3.3 aspect ratio, 0 spacing) across all media grids
class MediaGridDelegate {
  /// Creates a standard grid delegate for media items
  ///
  /// Uses [GridSizeCalculator.getMaxCrossAxisExtent] by default.
  /// Set [usePaddingAware] to true to use [GridSizeCalculator.getMaxCrossAxisExtentWithPadding] instead.
  /// Set [useWideAspectRatio] to true to use 16:9 aspect ratio for episode thumbnails.
  /// Pass [maxCrossAxisExtentOverride] to bypass the calculator and the wide-aspect multiplier —
  /// the caller is then responsible for providing a fully-resolved per-cell width.
  static SliverGridDelegateWithMaxCrossAxisExtent createDelegate({
    required BuildContext context,
    required int density,
    bool usePaddingAware = false,
    double horizontalPadding = 16,
    bool useWideAspectRatio = false,
    double? maxCrossAxisExtentOverride,
  }) {
    final aspectRatio = useWideAspectRatio
        ? GridLayoutConstants.episodeGridCellAspectRatio
        : GridLayoutConstants.posterAspectRatio;

    double maxCrossAxisExtent;
    if (maxCrossAxisExtentOverride != null) {
      maxCrossAxisExtent = maxCrossAxisExtentOverride;
    } else {
      maxCrossAxisExtent = usePaddingAware
          ? GridSizeCalculator.getMaxCrossAxisExtentWithPadding(context, density, horizontalPadding)
          : GridSizeCalculator.getMaxCrossAxisExtent(context, density);

      // For wide aspect ratio (16:9), increase max extent so items are larger
      // and there are fewer per row (roughly 1.8x wider to maintain similar visual area)
      if (useWideAspectRatio) {
        maxCrossAxisExtent *= 1.8;
      }
    }

    return SliverGridDelegateWithMaxCrossAxisExtent(
      maxCrossAxisExtent: maxCrossAxisExtent,
      childAspectRatio: aspectRatio,
      crossAxisSpacing: GridLayoutConstants.crossAxisSpacing,
      mainAxisSpacing: GridLayoutConstants.mainAxisSpacing,
    );
  }
}