using System;
using System.Collections.Generic;
using System.IO;

namespace AnotherReplayReader.ReplayFile
{
    internal sealed class CommandChunk
    {
        public byte CommandId { get; private set; }
        public int PlayerIndex { get; private set; }

        public static List<CommandChunk> Parse(ReplayChunk chunk)
        {
            if (chunk.Type != 1)
            {
                throw new NotImplementedException();
            }

            static int ManglePlayerId(byte id)
            {
                return id / 8 - 2;
            }

            using var reader = chunk.GetReader();
            if (reader.ReadByte() != 1)
            {
                throw new InvalidDataException("Payload first byte not 1");
            }

            var list = new List<CommandChunk>();
            var numberOfCommands = reader.ReadInt32();
            for (var i = 0; i < numberOfCommands; ++i)
            {
                var commandId = reader.ReadByte();
                var playerId = reader.ReadByte();
                reader.ReadCommandData(commandId);
                list.Add(new CommandChunk
                {
                    CommandId = commandId,
                    PlayerIndex = ManglePlayerId(playerId)
                });
            }

            if (reader.BaseStream.Position != reader.BaseStream.Length)
            {
                throw new InvalidDataException("Payload not fully parsed");
            }

            return list;
        }

        public override string ToString()
        {
            return $"[玩家 {PlayerIndex}，{RA3Commands.GetCommandName(CommandId)}]";
        }
    }
}