using CommandLine;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.Json;
using RedisManager.Utils;

namespace RedisManager.Commands
{
    [Verb("list-instances", HelpText = "List all configured Redis instances.")]
    public class ListInstancesOptions { }

    [Verb("add-instance", HelpText = "Add a new Redis instance.")]
    public class AddInstanceOptions
    {
        [Option('n', "name", Required = true, HelpText = "Instance name.")]
        public string Name { get; set; }
        [Option('h', "host", Required = true, HelpText = "Redis host.")]
        public string Host { get; set; }
        [Option('p', "port", Required = false, HelpText = "Redis port.")]
        public int Port { get; set; } = 6379;
        [Option('w', "password", Required = false, HelpText = "Redis password.")]
        public string Password { get; set; }
    }

    [Verb("update-instance", HelpText = "Update an existing Redis instance.")]
    public class UpdateInstanceOptions
    {
        [Option('n', "name", Required = true, HelpText = "Instance name.")]
        public string Name { get; set; }
        [Option('h', "host", Required = false, HelpText = "Redis host.")]
        public string Host { get; set; }
        [Option('p', "port", Required = false, HelpText = "Redis port.")]
        public int Port { get; set; } = 6379;
        [Option('w', "password", Required = false, HelpText = "Redis password.")]
        public string Password { get; set; }
    }

    [Verb("delete-instance", HelpText = "Delete a Redis instance.")]
    public class DeleteInstanceOptions
    {
        [Option('n', "name", Required = true, HelpText = "Instance name.")]
        public string Name { get; set; }
    }

    public static class InstanceCommands
    {
        public static int RunListInstances(Config config)
        {
            if (config.Instances.Count == 0)
            {
                Console.WriteLine(Output.Yellow("No instances configured."));
                return 0;
            }

            var rows = config.Instances.Select(i => new[] { i.Name, i.Host, i.Port.ToString(), i.Password ?? "" }).ToList();
            RedisUtils.PrintTable(new[] { "Name", "Host", "Port", "Password" }, rows);
            return 0;
        }

        public static int RunAddInstance(AddInstanceOptions opts, Config config)
        {
            if (config.Instances.Any(i => i.Name == opts.Name))
            {
                Console.WriteLine(Output.Red($"Instance '{opts.Name}' already exists."));
                return 1;
            }

            var instance = new InstanceConfig
            {
                Name = opts.Name,
                Host = opts.Host,
                Port = opts.Port,
                Password = opts.Password
            };

            config.Instances.Add(instance);
            SaveConfig(config, "redismanager.json");
            Console.WriteLine(Output.Green($"Instance '{opts.Name}' added successfully."));
            return 0;
        }

        public static int RunUpdateInstance(UpdateInstanceOptions opts, Config config)
        {
            var instance = config.Instances.Find(i => i.Name == opts.Name);
            if (instance == null)
            {
                Console.WriteLine(Output.Red($"Instance '{opts.Name}' not found."));
                return 1;
            }

            if (!string.IsNullOrEmpty(opts.Host))
                instance.Host = opts.Host;
            if (opts.Port != 6379)
                instance.Port = opts.Port;
            if (!string.IsNullOrEmpty(opts.Password))
                instance.Password = opts.Password;

            SaveConfig(config, "redismanager.json");
            Console.WriteLine(Output.Green($"Instance '{opts.Name}' updated successfully."));
            return 0;
        }

        public static int RunDeleteInstance(DeleteInstanceOptions opts, Config config)
        {
            var instance = config.Instances.Find(i => i.Name == opts.Name);
            if (instance == null)
            {
                Console.WriteLine(Output.Red($"Instance '{opts.Name}' not found."));
                return 1;
            }

            config.Instances.Remove(instance);
            SaveConfig(config, "redismanager.json");
            Console.WriteLine(Output.Green($"Instance '{opts.Name}' deleted successfully."));
            return 0;
        }

        private static void SaveConfig(Config config, string path)
        {
            var json = JsonSerializer.Serialize(config, new JsonSerializerOptions { WriteIndented = true });
            File.WriteAllText(path, json);
        }
    }
}