using MassTransit;
using OpenWarehouse.warehouse.api.Common.ItemTagManager;
using OpenWarehouse.warehouse.api.Common.Kafka;
using OpenWarehouse.warehouse.api.Common.Kafka.TagTree;
using OpenWarehouse.warehouse.api.Common.TaskManager;
using OpenWarehouse.warehouse.api.Model.Item;
using ItemCategoryTag = OpenWarehouse.warehouse.api.Model.Item.ItemCategoryTag;
using TaskStatus = OpenWarehouse.warehouse.api.Common.TaskManager.TaskStatus;

namespace OpenWarehouse.warehouse.api.Services;

public class TagTreeConsumer(ILogger<TagTreeConsumer> logger, ITaskManager taskManager
    ,IItemTagManager itemTagManager) : IConsumer<TagTreeKafkaMessage>
{
    public async Task Consume(ConsumeContext<TagTreeKafkaMessage> context)
    {
        logger.LogInformation("Received and processing Kafka Message: {Guid}", context.Message.Guid);

        var status = TaskStatus.Processing;

        try
        {
            await taskManager.UpdateTaskStatus(context.Message.Guid, status);

            switch (context.Message.Action)
            {
                case Actions.Create:
                    status = await Create(context.Message);
                    break;
                case Actions.Delete:
                    status = await Delete(context.Message.ItemCategoryTagsList);
                    break;
                default:
                    logger.LogWarning("Action not allowed in request: {Guid}", context.Message.Guid);
                    status = TaskStatus.Error;
                    break;
            }

            await taskManager.UpdateTaskStatus(context.Message.Guid, status);
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Error occurred while processing Kafka message: {Guid}", context.Message.Guid);
            status = TaskStatus.Error;
            await taskManager.UpdateTaskStatus(context.Message.Guid, status);
        }
    }

    private async Task<TaskStatus> Create(TagTreeKafkaMessage context)
    {
        try
        {
            var len = context.ItemCategoryTagsList.Count;
            var preProcessingData = context.ItemCategoryTagsList
                .Distinct()
                .ToList();
            var result = await itemTagManager.CreateTagTree(preProcessingData);

            if (result == 0)
            {
                logger.LogWarning("Failed to create tag tree for message: {Guid}", context.Guid);
                return TaskStatus.Error;
            }
            else if (result < len)
            {
                logger.LogInformation("Partial success in creating tag tree for message: {Guid}", context.Guid);
                return TaskStatus.NotFullSuccess;
            }
            else
            {
                logger.LogInformation("Successfully created tag tree for message: {Guid}", context.Guid);
                return TaskStatus.Success;
            }
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Error occurred while creating tag tree for message: {Guid}", context.Guid);
            return TaskStatus.Error;
        }
    }

    private async Task<TaskStatus> Delete(List<ItemCategoryTag> names)
    {
        try
        {
            var result = await itemTagManager.DeleteTagsByNames(names);

            if (result == 0)
            {
                logger.LogWarning("Failed to delete tags for names: {Names}", names);
                return TaskStatus.Error;
            }
            else if (result < names.Count)
            {
                logger.LogInformation("Partial success in deleting tags for names: {Names}", names);
                return TaskStatus.NotFullSuccess;
            }
            else
            {
                logger.LogInformation("Successfully deleted tags for names: {Names}", names);
                return TaskStatus.Success;
            }
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "Error occurred while deleting tags for names: {Names}", names);
            return TaskStatus.Error;
        }
    }
}