using EVCB_OCPP.Packet.Messages.Core;
using EVCB_OCPP.WSServer.Message;
using EVCB_OCPP.WSServer.Service.DbService;
using EVCB_OCPP.WSServer.Service.WsService;
using log4net.Core;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EVCB_OCPP.WSServer.Service;

public static class StationConfigServiceExt
{
    public static Task InitStationConfigService(this IHost host)
    {
        var server = host.Services.GetRequiredService<ProtalServer>();
        var stationConfigService = host.Services.GetRequiredService<StationConfigService>();
        server.InitActions.Add(stationConfigService.CheckAndUpdateEvseConfig);
        return host.Services.GetRequiredService<StationConfigService>().Init();
    }
}

public class StationConfigService
{
    public StationConfigService(
        ProtalServer portalServer
        , WebDbService webDbService
        , ServerMessageService messageService
        , ConfirmWaitingMessageSerevice confirmWaitingMessageSerevice
        , ILogger<StationConfigService> logger)
    {
        this.portalServer = portalServer;
        this.webDbService = webDbService;
        this.messageService = messageService;
        this.confirmWaitingMessageSerevice = confirmWaitingMessageSerevice;
        this.logger = logger;
    }

    private readonly ProtalServer portalServer;
    private readonly WebDbService webDbService;
    private readonly ServerMessageService messageService;
    private readonly ConfirmWaitingMessageSerevice confirmWaitingMessageSerevice;
    private readonly ILogger<StationConfigService> logger;

    internal static Dictionary<int, Dictionary<string, string>> stationConfigRecord = null;

    public async Task Init()
    {
        stationConfigRecord = await webDbService.GetStationEvseConfigs();
    }

    public async Task CheckAndUpdateEvseConfig(WsClientData session, CancellationToken token = default)
    {
        var chargeBoxId = session.ChargeBoxId;
        var stationId = await webDbService.GetEvseStation(chargeBoxId);
        if (stationId is null)
        {
            return;
        }

        if (session.StationId != stationId)
        {
            session.StationId = stationId;
            await UpdateEvseConfig(chargeBoxId, stationId.Value);
        }
        return;
    }

    public async Task CheckAndUpdateStationConfig()
    {
        await UpdateStationConfigChangedEvses();
        await UpdateStationChangedEvses();
        return;
    }

    private async Task UpdateStationConfigChangedEvses()
    {
        List<int> modifiedStations = new();
        var dbStationEvseConfig = await webDbService.GetStationEvseConfigs();
        foreach (var stationConfig in dbStationEvseConfig)
        {
            if (!stationConfigRecord.ContainsKey(stationConfig.Key) ||
                !CheckIsEqual(stationConfig.Value, stationConfigRecord[stationConfig.Key]))
            {
                modifiedStations.Add(stationConfig.Key);
            }
        }
        if (modifiedStations.Count == 0)
        {
            return;
        }

        stationConfigRecord = dbStationEvseConfig;

        var connectedEvses = portalServer.GetClientDic().Values;
        foreach (var evse in connectedEvses)
        {
            if (evse.IsCheckIn &&
                evse.StationId is not null &&
                modifiedStations.Contains(evse.StationId.Value))
            {
                await UpdateEvseConfig(evse.ChargeBoxId, evse.StationId.Value);
            }
        }
    }

    private async Task UpdateStationChangedEvses()
    {
        List<string> modifiedEvses = new();
        var connectedEvses = portalServer.GetClientDic().Values.ToList();
        foreach (var evse in connectedEvses)
        {
            var currentStation = await webDbService.GetEvseStation(evse.ChargeBoxId);
            if (currentStation is null)
            {
                evse.StationId = null;
                continue;
            }

            if (evse.StationId != currentStation)
            {
                evse.StationId = currentStation;
                await UpdateEvseConfig(evse.ChargeBoxId, currentStation.Value);
            }
        }
    }

    private async Task UpdateEvseConfig(string chargeBoxId, int stationId, CancellationToken token = default)
    {
        MessageResult getEvseCurrentConfigResponse = await GetEvseCurrentConfig(chargeBoxId, token);
        if (!getEvseCurrentConfigResponse.Success || getEvseCurrentConfigResponse.Message is not GetConfigurationConfirmation confirmation)
        {
            logger.LogWarning("{chargeBoxId} get config from evse failed", chargeBoxId);
            return;
        }

        if (!stationConfigRecord.ContainsKey(stationId))
        {
            logger.LogInformation("{chargeBoxId} doesnt has station config", chargeBoxId);
            return;
        }

        var dbConfigs = stationConfigRecord[stationId];
        await ComparenUpdateConfig(chargeBoxId,
            evseCurrentConfigs: confirmation.configurationKey.ToDictionary(x => x.key, x => x.value),
            evseDbConfigs: dbConfigs,
            token);
    }


    private async Task<MessageResult> GetEvseCurrentConfig(string chargeBoxId, CancellationToken token = default)
    {
        var sendTask = async () => await messageService.SendGetEVSEConfigureRequest(chargeBoxId);
        var response = await confirmWaitingMessageSerevice.SendAndWaitUntilResultAsync(sendTask, token);
        return response;
    }

    private async Task<Dictionary<string, string>> GetEvseDBCurrentConfig(string chargeBoxId, CancellationToken token = default)
    {
        var receivedStaionID = await webDbService.GetEvseStation(chargeBoxId, token);
        if (receivedStaionID is null)
        {
            logger.LogInformation("{chargeBoxId} station not found", chargeBoxId);
            return null;
        }
        var staionID = receivedStaionID.Value;

        if (!stationConfigRecord.Keys.Contains(staionID))
        {
            stationConfigRecord[staionID] = await webDbService.GetEvseStationConfig(staionID);
        }

        return stationConfigRecord[staionID];
        //return webDbService.GetCustomerStationEvseConfig(chargeBoxId, token);
    }

    internal async Task ComparenUpdateConfig(string chargeBoxId,
        Dictionary<string, string> evseCurrentConfigs,
        Dictionary<string, string> evseDbConfigs,
        CancellationToken token = default)
    {
        foreach (var config in evseDbConfigs)
        {
            if (evseCurrentConfigs.Keys.Contains(config.Key) &&
                evseCurrentConfigs[config.Key] == config.Value)
            {
                continue;
            }

            MessageResult response = null;
            var sendTask = async () => await messageService.SendChangeConfigurationRequest(chargeBoxId, config.Key, config.Value);
            response = await confirmWaitingMessageSerevice.SendAndWaitUntilResultAsync(sendTask, token);
        }
    }

    private bool CheckIsEqual(Dictionary<string, string> d1, Dictionary<string, string> d2)
    {
        return d1.Count == d2.Count && d1.All(
             (d1KV) => d2.TryGetValue(d1KV.Key, out var d2Value) && (
                  d1KV.Value == d2Value ||
                  d1KV.Value?.Equals(d2Value) == true)
        );
    }
}