using SampleApplication.Entities;
using System.Net.Http.Headers;
using System.Reflection.Metadata.Ecma335;

namespace SampleApplication
{
    public class ShapeProcessor
    {
        public List<ShapeInput> shapes = new List<ShapeInput>();
        public void AddShapes(IEnumerable<ShapeInput> shapes)
        {
            // TODO:
            // - Ignore duplicate Ids
            // - Validate dimensions
            // - Store shapes in memory

            foreach(var shape in shapes)
            {
                if (!ValidateDimensions(shape))
                {
                    throw new ArgumentException("Invalid shape dimensions");
                }

                this.shapes.Add(shape);
            }
        }

        public (double Area, double Perimeter) GetResult(int id)
        {
            // TODO:
            // - Throw KeyNotFoundException if not found
            // - Compute area & perimeter

            if(!shapes.Any(s => s.Id == id))
            {
                throw new KeyNotFoundException("Shape not found");
            }

           var shape = shapes.First(s => s.Id == id);

            return this.CalculateAreaPerimeter(shape);
        }

        public (int TotalShapes, double TotalArea, int MaxPerimeterId) GetStatistics()
        {
            // TODO:

            var totalShapes = shapes.Count;

            double totalArea = shapes.Sum(s => this.CalculateAreaPerimeter(s).area);

            var maxPerimeterShape = shapes.OrderByDescending(s => this.CalculateAreaPerimeter(s).perimeter).FirstOrDefault();

            return (totalShapes, totalArea, maxPerimeterShape != null ? maxPerimeterShape.Id : 0);
        }

        private bool ValidateDimensions(ShapeInput shape)
        {
            return shape.Type switch
            {
                ShapeType.Circle => shape.Dimensions.Length == 1 && shape.Dimensions[0] > 0,
                ShapeType.Rectangle => shape.Dimensions.Length == 2 && shape.Dimensions.All(d => d > 0),
                ShapeType.Triangle => shape.Dimensions.Length == 2,
                _ => false,
            };
        }

        private (double area, double perimeter) CalculateAreaPerimeter(ShapeInput shape)
        {
            var perimeter = shape.Type switch
            {
                ShapeType.Circle =>
                    2 * Math.PI * shape.Dimensions[0],
                ShapeType.Rectangle =>
                    2 * (shape.Dimensions[0] + shape.Dimensions[1]),
                ShapeType.Triangle => this.CalculateTrianglePerimeter(shape),
                _ => throw new NotSupportedException("Shape type not supported"),
            };

            var area = shape.Type switch
            {
                ShapeType.Circle =>
                    Math.PI * shape.Dimensions[0] * shape.Dimensions[0],
                ShapeType.Rectangle =>
                    shape.Dimensions[0] * shape.Dimensions[1],
                ShapeType.Triangle =>
                    0.5 * shape.Dimensions[0] * shape.Dimensions[1],
                _ => throw new NotSupportedException("Shape type not supported"),
            };

            return (area, perimeter);
        }

        private double CalculateTrianglePerimeter(ShapeInput shape)
        {
            double @base = shape.Dimensions[0];
            double height = shape.Dimensions[1];
            double hypotenuse = Math.Sqrt(@base * @base + height * height);
             return @base + height + hypotenuse;
        }
    }
}