using System;
using System.Collections.Generic;

public class ComInput
{
    private int pinCount;
    private char pressedValue = '0';

    private bool[] buttonState;
    private bool[] buttonDown;
    private bool[] buttonUp;

    private static string configPath = "Configs/ComInput.json";

    private Dictionary<InSignal, int> pinMappings = new();
    private bool initialized = false;

    public void Initialize()
    {
        var config = LoadConfig();
        AssignPinMappingsFromConfig(config);
        ComPortController.InputRecieved += UpdateInputState;

        initialized = true;
    }

    //Ожидается строка с бинарным представлением цифровых входов
    private void UpdateInputState(string input)
    {
        for (int i = 0; i < input.Length; i++)
        {
            bool buttonPressed = input[i] == pressedValue;
            buttonState[i] = buttonPressed;
            if (buttonPressed == buttonState[i]) return;

            buttonDown[i] = buttonPressed;
            buttonUp[i] = !buttonPressed;
        }
    }

    public bool GetButton(InSignal signal) => CheckSignalState(buttonState, signal);
    public bool GetButtonDown(InSignal signal) => CheckSignalState(buttonDown, signal);
    public bool GetButtonUp(InSignal signal) => CheckSignalState(buttonUp, signal);

    private int GetPhysicalPin(InSignal signal)
    {
        if (pinMappings.TryGetValue(signal, out int pin))
            return pin;

        return (int)signal;
    }

    public void ResetFrameStates()
    {
        for (int i = 0; i < pinCount; i++)
        {
            buttonDown[i] = false;
            buttonUp[i] = false;
        }
    }

    private bool CheckSignalState(bool[] statesArray, InSignal signal)
    {
        if (!initialized) return false;
        return statesArray[GetPhysicalPin(signal)];
    }

    private ComInputConfig LoadConfig()
    {
        ComInputConfig config = FileUtil.LoadJson<ComInputConfig>(configPath, FileUtil.AppDirectory.Streaming).Data;
        if (config == null)
        {
            config = new ComInputConfig();
            FileUtil.SaveJson(configPath, FileUtil.AppDirectory.Streaming, config);
        }
        return config;
    }

    private void AssignPinMappingsFromConfig(ComInputConfig config)
    {
        pinMappings[InSignal.UpLeft] = config.UpLeft;
        pinMappings[InSignal.UpRight] = config.UpRight;
        pinMappings[InSignal.DownLeft] = config.DownLeft;
        pinMappings[InSignal.DownRight] = config.DownRight;

        pinMappings[InSignal.CenterSensor] = config.CenterSensor;
        pinMappings[InSignal.Service] = config.Service;

        pinCount = config.PinCount;
        pressedValue = config.PositiveChar;

        buttonState = new bool[pinCount];
        buttonUp = new bool[pinCount];
        buttonDown = new bool[pinCount];
    }

    [Serializable]
    public class ComInputConfig
    {
        public int DownLeft = 2;
        public int DownRight = 1;
        public int UpLeft = 3;
        public int UpRight = 0;

        public int CenterSensor = 25;
        public int Service = 4;

        public int PinCount = 26;
        public char PositiveChar = '0';
    }
}