using System.Collections.Generic;

namespace Tracing
{
    public class AddressStack
    {
        // the first frame is the address of the last called method
        private readonly List<ulong> _stack;

        public AddressStack( int capacity )
        {
            _stack = new List<ulong>( capacity );
        }

        // No need to override GetHashCode because we don't want to use it as a key in a dictionary
        public override bool Equals( object obj )
        {
            if( obj == null )
                return false;

            var stack = obj as AddressStack;
            if( stack == null )
                return false;

            var frameCount = _stack.Count;
            if( frameCount != stack._stack.Count )
                return false;

            for( int i = 0; i < frameCount; i++ )
            {
                if( _stack[i] != stack._stack[i] )
                    return false;
            }

            return true;
        }

        public override int GetHashCode() => _stack.GetHashCode();

        public IReadOnlyList<ulong> Stack => _stack;

        public void AddFrame( ulong address )
        {
            _stack.Add( address );
        }
    }
}