namespace BackOffice.BFF.WebApi.Common.Services;

using Microsoft.Extensions.Logging;
using System.Collections.Generic;

public interface IDispatchRequestToCQRS
{
    Task<TResponse> Handle<TRequest, TCommand, TResponse>(TRequest request,
        ServerCallContext context);
    Task<Empty> Handle<TRequest, TCommand>(TRequest request,
        ServerCallContext context);
    Task<TResponse> Handle<TCommand, TResponse>(ServerCallContext context);
}
public class DispatchRequestToCQRS : IDispatchRequestToCQRS
{
    private readonly ISender _sender;
    private readonly ILogger<DispatchRequestToCQRS> _logger;

    public DispatchRequestToCQRS(ISender sender, ILogger<DispatchRequestToCQRS> logger)
    {
        _sender = sender;
        _logger = logger;
    }

    public async Task<TResponse> Handle<TRequest, TCommand, TResponse>(TRequest request,
        ServerCallContext context)
    {
        try
        {
            if (request is null)
            {
                throw new ArgumentNullException(nameof(request));
            }

            var cqrsInput = request.Adapt<TCommand>();

            if (cqrsInput is null)
            {
                throw new ArgumentNullException(nameof(cqrsInput));
            }

            var output = await _sender.Send(cqrsInput, context.CancellationToken);
            
            if (output is null)
            {
                _logger.LogError("Command/Query {CommandType} returned null output", typeof(TCommand).Name);
                throw new InvalidOperationException($"Command/Query {typeof(TCommand).Name} returned null output");
            }

            try
            {
                _logger.LogInformation("Mapping from {SourceType} to {TargetType}", output.GetType().Name, typeof(TResponse).Name);
                
                // Try to detect problematic properties before mapping
                LogSourceObjectStructure(output);
                
                // Use TypeAdapter.Adapt instead of extension method to ensure MapWith() is used
                var result = TypeAdapter.Adapt(output, output.GetType(), typeof(TResponse));
                
                _logger.LogInformation("Mapping successful: {SourceType} -> {TargetType}", output.GetType().Name, typeof(TResponse).Name);
                return (TResponse)result;
            }
            catch (Exception mappingEx)
            {
                _logger.LogError(mappingEx, "Mapping failed: {SourceType} -> {TargetType}. Full error: {ErrorMessage}", 
                    output.GetType().Name, typeof(TResponse).Name, mappingEx.ToString());
                
                // Log detailed property information
                LogDetailedPropertyInfo(output, typeof(TResponse));
                
                throw new InvalidOperationException(
                    $"Failed to map {output.GetType().Name} to {typeof(TResponse).Name}. Check ProductsProfile configuration.", 
                    mappingEx);
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error in DispatchRequestToCQRS.Handle<{Request},{Command},{Response}>", 
                typeof(TRequest).Name, typeof(TCommand).Name, typeof(TResponse).Name);
            throw;
        }
    }
    public async Task<TResponse> Handle<TCommand, TResponse>(ServerCallContext context)
    {
        try
        {
            var cqrsInput = Activator.CreateInstance<TCommand>();
            if (cqrsInput is null)
            {
                throw new ArgumentNullException(nameof(cqrsInput));
            }

            var output = await _sender.Send(cqrsInput, context.CancellationToken);
            
            if (output is null)
            {
                _logger.LogError("Command/Query {CommandType} returned null output", typeof(TCommand).Name);
                throw new InvalidOperationException($"Command/Query {typeof(TCommand).Name} returned null output");
            }

            try
            {
                _logger.LogInformation("Mapping from {SourceType} to {TargetType}", output.GetType().Name, typeof(TResponse).Name);
                
                // Use TypeAdapter.Adapt instead of extension method to ensure MapWith() is used
                var result = TypeAdapter.Adapt(output, output.GetType(), typeof(TResponse));
                
                _logger.LogInformation("Mapping successful: {SourceType} -> {TargetType}", output.GetType().Name, typeof(TResponse).Name);
                return (TResponse)result;
            }
            catch (Exception mappingEx)
            {
                _logger.LogError(mappingEx, "Mapping failed: {SourceType} -> {TargetType}. Source properties: {@SourceData}", 
                    output.GetType().Name, typeof(TResponse).Name, output);
                throw new InvalidOperationException(
                    $"Failed to map {output.GetType().Name} to {typeof(TResponse).Name}. Check mapping Profile configuration.", 
                    mappingEx);
            }
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error in DispatchRequestToCQRS.Handle<{Command},{Response}>", 
                typeof(TCommand).Name, typeof(TResponse).Name);
            throw;
        }
    }
    public async Task<Empty> Handle<TRequest, TCommand>(TRequest request,
        ServerCallContext context)
    {
        try
        {
            if (request is null)
            {
                throw new ArgumentNullException(nameof(request));
            }

            var cqrsInput = request.Adapt<TCommand>();

            if (cqrsInput is null)
            {
                throw new ArgumentNullException(nameof(cqrsInput));
            }

            await _sender.Send(cqrsInput, context.CancellationToken);
            return new Empty();
        }
        catch (Exception)
        {
            throw;
        }
    }

    private void LogSourceObjectStructure(object source)
    {
        try
        {
            var properties = source.GetType().GetProperties();
            _logger.LogInformation("Source object has {PropertyCount} properties:", properties.Length);
            
            foreach (var prop in properties)
            {
                var value = prop.GetValue(source);
                var valueType = value?.GetType().Name ?? "null";
                var isCollection = value != null && value.GetType().IsGenericType && 
                                 value.GetType().GetGenericTypeDefinition() == typeof(List<>);
                
                if (isCollection)
                {
                    var count = ((System.Collections.ICollection)value).Count;
                    _logger.LogInformation("  - {PropertyName}: {PropertyType} (Collection with {Count} items)", 
                        prop.Name, prop.PropertyType.Name, count);
                }
                else
                {
                    _logger.LogInformation("  - {PropertyName}: {PropertyType} = {Value}", 
                        prop.Name, prop.PropertyType.Name, value);
                }
            }
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "Could not log source object structure");
        }
    }

    private void LogDetailedPropertyInfo(object source, System.Type targetType)
    {
        try
        {
            var sourceProps = source.GetType().GetProperties();
            var targetProps = targetType.GetProperties();
            
            _logger.LogError("=== DETAILED MAPPING ANALYSIS ===");
            _logger.LogError("Source type: {SourceType} ({SourcePropsCount} properties)", 
                source.GetType().FullName, sourceProps.Length);
            _logger.LogError("Target type: {TargetType} ({TargetPropsCount} properties)", 
                targetType.FullName, targetProps.Length);
            
            foreach (var sourceProp in sourceProps)
            {
                var targetProp = targetProps.FirstOrDefault(p => 
                    p.Name.Equals(sourceProp.Name, StringComparison.OrdinalIgnoreCase));
                
                if (targetProp != null)
                {
                    var sourceValue = sourceProp.GetValue(source);
                    var sourceType = sourceProp.PropertyType;
                    var targetPropType = targetProp.PropertyType;
                    
                    var isImmutable = targetPropType.FullName?.Contains("Google.Protobuf") == true ||
                                     targetPropType.Name.Contains("RepeatedField");
                    
                    _logger.LogError("  Property '{PropertyName}':", sourceProp.Name);
                    _logger.LogError("    Source: {SourceType} (value: {Value})", 
                        sourceType.Name, sourceValue);
                    _logger.LogError("    Target: {TargetType} {ImmutableWarning}", 
                        targetPropType.Name, 
                        isImmutable ? "⚠️ IMMUTABLE - needs MapWith()" : "");
                }
                else
                {
                    _logger.LogWarning("  Property '{PropertyName}' exists in source but NOT in target", 
                        sourceProp.Name);
                }
            }
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "Could not log detailed property info");
        }
    }
}