using System;
using System.Collections.Generic;
using ServiceStack.Redis.Pipeline;

namespace ServiceStack.Redis;

/// <summary>
/// Redis operation (transaction/pipeline) that allows queued commands to be completed
/// </summary>
public partial class RedisQueueCompletableOperation
{
    internal readonly List<QueuedRedisOperation> QueuedCommands = new List<QueuedRedisOperation>();

    internal QueuedRedisOperation CurrentQueuedOperation;

    internal void BeginQueuedCommand(QueuedRedisOperation queuedRedisOperation)
    {
        if (CurrentQueuedOperation != null)
            throw new InvalidOperationException("The previous queued operation has not been commited");

        CurrentQueuedOperation = queuedRedisOperation;
    }

    internal void AssertCurrentOperation()
    {
        if (CurrentQueuedOperation == null)
            throw new InvalidOperationException("No queued operation is currently set");
    }

    protected virtual void AddCurrentQueuedOperation()
    {
        this.QueuedCommands.Add(CurrentQueuedOperation);
        CurrentQueuedOperation = null;
    }

    public virtual void CompleteVoidQueuedCommand(Action voidReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.VoidReadCommand = voidReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteIntQueuedCommand(Func<int> intReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.IntReadCommand = intReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteLongQueuedCommand(Func<long> longReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.LongReadCommand = longReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteBytesQueuedCommand(Func<byte[]> bytesReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.BytesReadCommand = bytesReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteMultiBytesQueuedCommand(Func<byte[][]> multiBytesReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.MultiBytesReadCommand = multiBytesReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteStringQueuedCommand(Func<string> stringReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.StringReadCommand = stringReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteMultiStringQueuedCommand(Func<List<string>> multiStringReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.MultiStringReadCommand = multiStringReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteDoubleQueuedCommand(Func<double> doubleReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.DoubleReadCommand = doubleReadCommand;
        AddCurrentQueuedOperation();
    }

    public virtual void CompleteRedisDataQueuedCommand(Func<RedisData> redisDataReadCommand)
    {
        //AssertCurrentOperation();
        // this can happen when replaying pipeline/transaction
        if (CurrentQueuedOperation == null) return;

        CurrentQueuedOperation.RedisDataReadCommand = redisDataReadCommand;
        AddCurrentQueuedOperation();
    }

}