using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

using YesNt.Interpreter.Attributes;
using YesNt.Interpreter.Enums;
using YesNt.Interpreter.Runtime;
using YesNt.Interpreter.Utilities;

namespace YesNt.Interpreter.Statements;

internal partial class ProcessingStatements : StatementRuntimeInformation
{
    [Statement("calc", SearchMode.EndOfLine, SpaceAround.Start, ConsoleColor.DarkYellow, Priority = Priority.High)]
    public void Calculate(string args)
    {
        RuntimeInfo.CurrentLine = TemplateProcessor.ProcessCalculations(args.FromSafeString(), RuntimeInfo, CalculationRegex());
    }

    [Statement("eval", SearchMode.EndOfLine, SpaceAround.Start, ConsoleColor.DarkYellow, Priority = Priority.VeryHigh)]
    public void Evaluate(string args)
    {
        RuntimeInfo.CurrentLine = args.FromSafeString();
    }

    [Statement("task", SearchMode.EndOfLine, SpaceAround.Start, ConsoleColor.DarkYellow, Priority = Priority.VeryHigh)]
    public void RunTask(string line)
    {
        int lineNumber = RuntimeInfo.LineNumber;
        List<Line> lines = RuntimeInfo.Lines.GetRange(0, RuntimeInfo.Lines.Count);

        Line oldLine = lines[lineNumber];

        lines[lineNumber] = new Line(line, oldLine.FileName, oldLine.LineNumber);
        _ = Task.Run(() =>
        {
            YesNtInterpreter interpreter = new YesNtInterpreter();
            interpreter.Execute(lines, RuntimeInfo.GlobalVariables, lineNumber, RuntimeInfo);
        });

        RuntimeInfo.CurrentLine = string.Empty;
    }

    [Statement("sleep", SearchMode.StartOfLine, SpaceAround.End, ConsoleColor.Magenta)]
    public void Sleep(string args)
    {
        if (int.TryParse(args, out int millisecondsTimeout))
        {
            ConsoleExtensions.Sleep(millisecondsTimeout, RuntimeInfo);
        }
        else
        {
            RuntimeInfo.Exit(ExitMessages.InvalidTimeoutValue(args), true);
        }
    }

    [Statement("length", SearchMode.StartOfLine, SpaceAround.End, ConsoleColor.Magenta)]
    public void Length(string args)
    {
        RuntimeInfo.InParametersStack.Clear();
        RuntimeInfo.OutParametersStack.Clear();

        RuntimeInfo.OutParametersStack.Push(args.FromSafeString().Length.ToString());
    }

    [Statement("import", SearchMode.StartOfLine, SpaceAround.End, ConsoleColor.Magenta)]
    public void Import(string path)
    {
        path = path.FromSafeString();
        path = Path.Combine(RuntimeInfo.WorkingDirectory, path);

        if (string.IsNullOrEmpty(Path.GetExtension(path)))
        {
            path = Path.ChangeExtension(path, "ynt");
        }

        if (File.Exists(path))
        {
            try
            {
                RuntimeInfo.Lines.RemoveAt(RuntimeInfo.LineNumber);
                string[] lines = File.ReadAllLines(path);

                for (int i = 0; i < lines.Length; i++)
                {
                    RuntimeInfo.Lines.Insert(RuntimeInfo.LineNumber + i, new Line(lines[i], Path.GetFileName(path), i));
                }
                RuntimeInfo.PreScanLinesAction?.Invoke();
                RuntimeInfo.LineNumber--;
            }
            catch
            {
                RuntimeInfo.Exit(ExitMessages.CouldNotLoadFile(path), true);
            }
        }
        else
        {
            RuntimeInfo.Exit(ExitMessages.CouldNotFindFile(path), true);
        }
    }

    [GeneratedRegex("[0-9*+().,^%/-]+[0-9*+ ().,^%/-]+[0-9*+().,^%/-]+")]
    private static partial Regex CalculationRegex();
}