using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;


namespace ServerCore;


//=============================================================================================
// 조건별 체크 관련 예외 지원 함수
//
// author : kangms
// 
//=============================================================================================

public static class ConditionValidCheckHelper
{
    public static void throwIfFalse( bool isCondition
                                   , string errMsg
                                   , Func<string, Exception>? overrideException = null )
    {
        if (isCondition)
            return;

        if (overrideException != null)
        {
            throw overrideException(errMsg);
        }

        throw new InvalidOperationException(errMsg);
    }

    public static void throwIfFalseWithCondition( Expression<Func<bool>> conditionExpression
                                                , Func<string>? fnLog = null
                                                , Func<string, Exception>? overrideException = null )
    {
        var compiled_expression = conditionExpression.Compile();
        if (compiled_expression())
            return;

        string condition_text = conditionExpression.Body.ToString();
        string errMsg = fnLog?.Invoke() ?? $"Failed to check condition: '{condition_text}'";

        if (overrideException != null)
        {
            throw overrideException(errMsg);
        }

        throw new InvalidOperationException(errMsg);
    }
}


public static class RangeCheckHelper
{
    public static void throwIfOutOfRange( int value, int min, int max
                                        , Func<string>? fnLog = null
                                        , Func<string, Exception>? overrideException = null )
    {
        if (value >= min && value <= max)
            return;

        string message = fnLog?.Invoke() ?? $"Value {value} is out of range [{min}, {max}]";

        if (overrideException != null)
        {
            throw overrideException(message);
        }

        throw new ArgumentOutOfRangeException(nameof(value), message);
    }
}