using CommandLine;
using StackExchange.Redis;
using System;
using System.Collections.Generic;
using System.Linq;
using RedisManager.Utils;

namespace RedisManager.Commands
{
    /// <summary>
    /// Contains command line options and implementations for Redis connection management operations.
    /// Provides functionality for AUTH, QUIT, CLIENT LIST, CLIENT KILL, CLIENT GETNAME, and CLIENT SETNAME commands.
    /// </summary>
    [Verb("auth", HelpText = "Authenticate to the server.")]
    public class AuthOptions
    {
        [Option('i', "instance", Required = true, HelpText = "Instance name.")]
        public string Instance { get; set; }
        [Value(0, MetaName = "password", Required = true, HelpText = "Password.")]
        public string Password { get; set; }
    }

    [Verb("quit", HelpText = "Close the connection.")]
    public class QuitOptions
    {
        [Option('i', "instance", Required = true, HelpText = "Instance name.")]
        public string Instance { get; set; }
    }

    [Verb("clientlist", HelpText = "Get the list of client connections.")]
    public class ClientListOptions
    {
        [Option('i', "instance", Required = true, HelpText = "Instance name.")]
        public string Instance { get; set; }
    }

    [Verb("clientkill", HelpText = "Kill a client connection.")]
    public class ClientKillOptions
    {
        [Option('i', "instance", Required = true, HelpText = "Instance name.")]
        public string Instance { get; set; }
        [Value(0, MetaName = "client_id", Required = true, HelpText = "Client ID.")]
        public string ClientId { get; set; }
    }

    [Verb("clientgetname", HelpText = "Get the current connection name.")]
    public class ClientGetNameOptions
    {
        [Option('i', "instance", Required = true, HelpText = "Instance name.")]
        public string Instance { get; set; }
    }

    [Verb("clientsetname", HelpText = "Set the current connection name.")]
    public class ClientSetNameOptions
    {
        [Option('i', "instance", Required = true, HelpText = "Instance name.")]
        public string Instance { get; set; }
        [Value(0, MetaName = "name", Required = true, HelpText = "Connection name.")]
        public string Name { get; set; }
    }

    public static class ConnectionCommands
    {
        /// <summary>
        /// Executes the AUTH command to authenticate to the server.
        /// </summary>
        /// <param name="opts">The AuthOptions containing instance and password.</param>
        /// <param name="config">The RedisManager configuration.</param>
        /// <returns>Exit code (0 for success, non-zero for failure).</returns>
        public static int RunAuth(AuthOptions opts, Config config)
        {
            var instance = RedisUtils.GetInstance(config, opts.Instance);
            using var redis = RedisUtils.ConnectRedis(instance);
            var db = redis.GetDatabase();
            db.Execute("AUTH", opts.Password);
            Console.WriteLine(Output.Green("OK"));
            return 0;
        }

        /// <summary>
        /// Executes the QUIT command to close the connection.
        /// </summary>
        /// <param name="opts">The QuitOptions containing instance.</param>
        /// <param name="config">The RedisManager configuration.</param>
        /// <returns>Exit code (0 for success, non-zero for failure).</returns>
        public static int RunQuit(QuitOptions opts, Config config)
        {
            var instance = RedisUtils.GetInstance(config, opts.Instance);
            using var redis = RedisUtils.ConnectRedis(instance);
            var db = redis.GetDatabase();
            db.Execute("QUIT");
            Console.WriteLine(Output.Green("OK"));
            return 0;
        }

        /// <summary>
        /// Executes the CLIENT LIST command to get the list of client connections.
        /// </summary>
        /// <param name="opts">The ClientListOptions containing instance.</param>
        /// <param name="config">The RedisManager configuration.</param>
        /// <returns>Exit code (0 for success, non-zero for failure).</returns>
        public static int RunClientList(ClientListOptions opts, Config config)
        {
            var instance = RedisUtils.GetInstance(config, opts.Instance);
            using var redis = RedisUtils.ConnectRedis(instance);
            var db = redis.GetDatabase();
            var result = db.Execute("CLIENT", "LIST");
            Console.WriteLine(Output.Green(result.ToString()));
            return 0;
        }

        /// <summary>
        /// Executes the CLIENT KILL command to kill a client connection.
        /// </summary>
        /// <param name="opts">The ClientKillOptions containing instance and client ID.</param>
        /// <param name="config">The RedisManager configuration.</param>
        /// <returns>Exit code (0 for success, non-zero for failure).</returns>
        public static int RunClientKill(ClientKillOptions opts, Config config)
        {
            var instance = RedisUtils.GetInstance(config, opts.Instance);
            using var redis = RedisUtils.ConnectRedis(instance);
            var db = redis.GetDatabase();
            db.Execute("CLIENT", "KILL", opts.ClientId);
            Console.WriteLine(Output.Green("OK"));
            return 0;
        }

        /// <summary>
        /// Executes the CLIENT GETNAME command to get the current connection name.
        /// </summary>
        /// <param name="opts">The ClientGetNameOptions containing instance.</param>
        /// <param name="config">The RedisManager configuration.</param>
        /// <returns>Exit code (0 for success, non-zero for failure).</returns>
        public static int RunClientGetName(ClientGetNameOptions opts, Config config)
        {
            var instance = RedisUtils.GetInstance(config, opts.Instance);
            using var redis = RedisUtils.ConnectRedis(instance);
            var db = redis.GetDatabase();
            var result = db.Execute("CLIENT", "GETNAME");
            Console.WriteLine(Output.Green(result.ToString()));
            return 0;
        }

        /// <summary>
        /// Executes the CLIENT SETNAME command to set the current connection name.
        /// </summary>
        /// <param name="opts">The ClientSetNameOptions containing instance and name.</param>
        /// <param name="config">The RedisManager configuration.</param>
        /// <returns>Exit code (0 for success, non-zero for failure).</returns>
        public static int RunClientSetName(ClientSetNameOptions opts, Config config)
        {
            var instance = RedisUtils.GetInstance(config, opts.Instance);
            using var redis = RedisUtils.ConnectRedis(instance);
            var db = redis.GetDatabase();
            db.Execute("CLIENT", "SETNAME", opts.Name);
            Console.WriteLine(Output.Green("OK"));
            return 0;
        }
    }
}