using Google.Protobuf;
using WebmrAPI.Utils.Sequences;
using WinIPC.Models;
using WinIPC.Utils;

namespace WebmrAPI.Utils
{
    public class Key
    {
        public Button Code { get; private set; }

        public Key(Button code) { Code = code; }

        public Key(string key)
        {
            Button code;

            switch (key.ToLowerInvariant())
            {
                case "-": case "_": Code = Button.Sub; break;
                case "+": case "=": Code = Button.Add; break;
                case "~": case "`": Code = Button.Tilde; break;
                case "<": case ",": Code = Button.Comma; break;
                case ">": case ".": Code = Button.Period; break;
                case ":": case ";": Code = Button.Colon; break;
                case "{": case "[": Code = Button.LBracket; break;
                case "}": case "]": Code = Button.RBracket; break;
                case "\\": case "|": Code = Button.BSol; break;
                case "/": case "?": Code = Button.Sol; break;
                case "'": case "\"": Code = Button.Quote; break;
                case "num+": Code = Button.NumAdd; break;
                case "num-": Code = Button.NumSub; break;
                case "num*": Code = Button.NumMul; break;
                case "num/": Code = Button.NumDiv; break;
                case "num.": Code = Button.NumDec; break;

                case "a": case "b": case "c": case "d": case "e": case "f":
                case "g": case "h": case "i": case "j": case "k": case "l":
                case "m": case "n": case "o": case "p": case "q": case "r":
                case "s": case "t": case "u": case "v": case "w": case "x":
                case "y": case "z": case "0": case "1": case "2": case "3":
                case "4": case "5": case "6": case "7": case "8": case "9":
                    if (Enum.TryParse($"Key{key}", out code))
                    {
                        Code = code;
                        break;
                    }
                    else goto default;
                case "shift": case "ctrl": case "alt": case "win":
                    if (Enum.TryParse($"L{key}", out code))
                    {
                        Code = code;
                        break;
                    }
                    else goto default;
                default:
                    if (Enum.TryParse(key, out code))
                    {
                        Code = code;
                        break;
                    }
                    else throw new ArgumentException($"Unexpected key \"{key}\"");
            }
        }
    }

    public class KeyShortcutSequence
    {
        private Queue<KeyValuePair<KeyShortcut, uint>> _queue = new();

        public KeyShortcutSequence(KeyShortcut key) { Next(key); }

        public KeyShortcutSequence Next(KeyShortcut shortcut, int delay = 0)
        {
            _queue.Enqueue(new KeyValuePair<KeyShortcut, uint>(shortcut, (uint)delay));
            return this;
        }

        public IEnumerable<InputAction> GetInputActions()
        {
            var actions = new InputAction[0];

            do
            {
                var kvpair = _queue.Dequeue();

                if (actions.Length > 0)
                {
                    actions[actions.Length - 1].DelayMs += kvpair.Value;
                }

                actions = actions.Concat(kvpair.Key.GetInputActions()).ToArray();
            } while (_queue.Count > 0);

            return actions;
        }
    }

    public class KeyShortcut
    {
        private readonly static DelayGenerator _dGen = new(new PerlinNumberGenerator<int>(75, 200, Int32.MaxValue));
        private Queue<Key> _queue = new();

        public KeyShortcut(Key key) { And(key); }
        public KeyShortcut(string key) { And(key); }

        public KeyShortcut And(Key key)
        {
            _queue.Enqueue(key);
            return this;
        }

        public KeyShortcut And(string key)
        {
            return And(new Key(key));
        }

        public IEnumerable<InputAction> GetHoldDownActions()
        {
            Key key;
            var actions = new InputAction[_queue.Count];

            for (int i = 0, n = _queue.Count; i < n;)
            {
                _queue.Enqueue(key = _queue.Dequeue());
                actions[i++] = new InputAction()
                {
                    DelayMs = (uint)_dGen.Next().Value,
                    Type = InputType.KeyDown,
                    Payload = ByteString.CopyFrom(PayloadHandler.Serialize(new ButtonInput { Button = key.Code }))
                };
            }

            return actions;
        }

        public IEnumerable<InputAction> GetHoldUpActions()
        {
            Key key;
            var actions = new InputAction[_queue.Count];

            for (int n = _queue.Count; n > 0;)
            {
                _queue.Enqueue(key = _queue.Dequeue());
                actions[--n] = new InputAction()
                {
                    DelayMs = (uint)_dGen.Next().Value,
                    Type = InputType.KeyUp,
                    Payload = ByteString.CopyFrom(PayloadHandler.Serialize(new ButtonInput { Button = key.Code }))
                };
            }

            return actions;
        }

        public IEnumerable<InputAction> GetInputActions()
        {
            Key key;
            int n = _queue.Count * 2;
            var actions = new InputAction[n];

            for (int i = 0; i < n;)
            {
                _queue.Enqueue(key = _queue.Dequeue());

                actions[i++] = new InputAction()
                {
                    DelayMs = (uint)_dGen.Next().Value,
                    Type = InputType.KeyDown,
                    Payload = ByteString.CopyFrom(PayloadHandler.Serialize(new ButtonInput { Button = key.Code }))
                };

                actions[--n] = new InputAction()
                {
                    DelayMs = (uint)_dGen.Next().Value,
                    Type = InputType.KeyUp,
                    Payload = ByteString.CopyFrom(PayloadHandler.Serialize(new ButtonInput { Button = key.Code }))
                };
            }

            return actions;
        }
    }

}