using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Flow.Launcher.Core.Resource;
using Flow.Launcher.Plugin;
using YamlDotNet.Serialization;
using YamlDotNet.Serialization.NamingConventions;
using Control = System.Windows.Controls.Control;

namespace Flow.Launcher.Core.Plugin
{
    /// <summary>
    /// Represent the plugin that using JsonPRC
    /// every JsonRPC plugin should has its own plugin instance
    /// </summary>
    public abstract class JsonRPCPluginBase : IAsyncPlugin, IContextMenu, ISettingProvider, ISavable
    {
        public const string JsonRPC = "JsonRPC";

        protected PluginInitContext Context;

        private string SettingConfigurationPath =>
            Path.Combine(Context.CurrentPluginMetadata.PluginDirectory, "SettingsTemplate.yaml");

        private string SettingDirectory => Context.CurrentPluginMetadata.PluginSettingsDirectoryPath;

        private string SettingPath => Path.Combine(SettingDirectory, "Settings.json");

        public abstract List<Result> LoadContextMenus(Result selectedResult);

        protected static readonly JsonSerializerOptions DeserializeOption = new()
        {
            PropertyNameCaseInsensitive = true,
#pragma warning disable SYSLIB0020
            // IgnoreNullValues is obsolete, but the replacement JsonIgnoreCondition.WhenWritingNull still 
            // deserializes null, instead of ignoring it and leaving the default (empty list). We can change the behaviour
            // to accept null and fallback to a default etc, or just keep IgnoreNullValues for now
            // see: https://github.com/dotnet/runtime/issues/39152
            IgnoreNullValues = true,
#pragma warning restore SYSLIB0020 // Type or member is obsolete
            Converters = { new JsonObjectConverter() }
        };

        protected static readonly JsonSerializerOptions RequestSerializeOption = new()
        {
            PropertyNameCaseInsensitive = true, PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        };

        protected abstract Task<bool> ExecuteResultAsync(JsonRPCResult result);

        protected JsonRPCPluginSettings Settings { get; set; }

        protected List<Result> ParseResults(JsonRPCQueryResponseModel queryResponseModel)
        {
            if (queryResponseModel.Result == null) return null;

            if (!string.IsNullOrEmpty(queryResponseModel.DebugMessage))
            {
                Context.API.ShowMsg(queryResponseModel.DebugMessage);
            }

            foreach (var result in queryResponseModel.Result)
            {
                result.AsyncAction = async _ =>
                {
                    Settings?.UpdateSettings(result.SettingsChange);

                    return await ExecuteResultAsync(result);
                };
            }

            var results = new List<Result>();

            results.AddRange(queryResponseModel.Result);

            Settings?.UpdateSettings(queryResponseModel.SettingsChange);

            return results;
        }

        protected void ExecuteFlowLauncherAPI(string method, object[] parameters)
        {
            var parametersTypeArray = parameters.Select(param => param.GetType()).ToArray();
            var methodInfo = typeof(IPublicAPI).GetMethod(method, parametersTypeArray);

            if (methodInfo == null)
            {
                return;
            }

            try
            {
                methodInfo.Invoke(Context.API, parameters);
            }
            catch (Exception)
            {
#if (DEBUG)
                throw;
#endif
            }
        }

        public abstract Task<List<Result>> QueryAsync(Query query, CancellationToken token);

        private async Task InitSettingAsync()
        {
            JsonRpcConfigurationModel configuration = null;
            if (File.Exists(SettingConfigurationPath))
            {
                var deserializer = new DeserializerBuilder().WithNamingConvention(CamelCaseNamingConvention.Instance).Build();
                configuration =
                    deserializer.Deserialize<JsonRpcConfigurationModel>(
                        await File.ReadAllTextAsync(SettingConfigurationPath));
            }

            Settings ??= new JsonRPCPluginSettings
            {
                Configuration = configuration, SettingPath = SettingPath, API = Context.API
            };

            await Settings.InitializeAsync();
        }

        public virtual async Task InitAsync(PluginInitContext context)
        {
            Context = context;
            await InitSettingAsync();
        }

        public void Save()
        {
            Settings?.Save();
        }

        public bool NeedCreateSettingPanel()
        {
            return Settings.NeedCreateSettingPanel();
        }

        public Control CreateSettingPanel()
        {
            return Settings.CreateSettingPanel();
        }
    }
}