using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using PARR.BLL.Domain.Mq;
using PARR.BLL.Services.Interfaces;
using PARR.DAL.Extensions;
using PARR.DAL.Models.Unit;
using PARR.DAL.Services.Interfaces.Unit;

namespace PARR.AIHITMainSyncer.Services
{
    internal class SyncerService : ISyncerService
    {
        private readonly ILogger<SyncerService> logger;
        private readonly ITransformService transformService;
        private readonly IUnitService unitService;
        private readonly IUnitFieldService unitFieldService;
        private readonly IUnitFieldValueService unitFieldValueService;

        public SyncerService(
            ILogger<SyncerService> logger,
            ITransformService transformService,
            IUnitService unitService,
            IUnitFieldService unitFieldService,
            IUnitFieldValueService unitFieldValueService
            )
        {
            this.logger = logger;
            this.transformService = transformService;
            this.unitService = unitService;
            this.unitFieldService = unitFieldService;
            this.unitFieldValueService = unitFieldValueService;
        }


        public async Task SyncAsync(string msg)
        {
            logger.LogInformation("Запуск синхронизации данных из очереди сообщений в ПАРР.");
            var objFromQuery = transformService.GetModelFromJson<AihitMainDataMq>(msg);
            if (objFromQuery == null)
                return;

            await SyncUnitAsync(objFromQuery);
        }


        private async Task SyncUnitAsync(AihitMainDataMq objFromQuery)
        {
            await SyncFieldsAsync(objFromQuery.Properties);

            await SyncValuesAsync(objFromQuery.Properties);

            Unit unit = await GetUnit(objFromQuery.Name);

            var changes = GetChangesInUnit(objFromQuery.Properties, unit);

            if (changes.Any())
            {
                var fieldsNameWithId = await unitFieldService.Get().AsNoTracking().Where(t => changes.Select(c =>
                                         Sanitize(c.Key.ToLower())).Any(c =>
                                         c == t.AihitName.ToLower()
                                         )).ToListAsync();
                var valuesWithId = await unitFieldValueService.Get().AsNoTracking().Where(t => changes.Select(c =>
                                            (c.Value == null) ? null : Sanitize(c.Value.ToLower())
                                        ).Any(c => c ==
                                        ((t.Value == null) ? null : t.Value!.ToLower())
                                        )).ToListAsync();

                foreach (var change in changes)
                {
                    ApplyChange(unit, fieldsNameWithId, valuesWithId, change);
                }

                if (!await unitService.CommitAsync())
                    logger.LogError($"Не удалось применить изменения по актуализиции аттрибуто Unit {unit.Name} в базе данных");
            }
        }


        private void ApplyChange(Unit unit, List<UnitField> fieldsNameWithId, List<UnitFieldValue> valuesWithId, KeyValuePair<string, string?> change)
        {
            var uValue = unit.UnitValues.FirstOrDefault(t => IsStringEqual(t.Field?.AihitName, change.Key));

            if (uValue == null)
            {
                var f = new UnitInValue
                {
                    UnitId = unit.Id,
                    FieldId = fieldsNameWithId.First(t => IsStringEqual(t.AihitName, change.Key)).Id,
                    ValueId = valuesWithId.First(t => IsStringEqual(t.Value, change.Value)).Id,
                    DateCreated = DateTimeOffset.UtcNow
                };

                unit.UnitValues.Add(f);
            }
            else
            {
                uValue.ValueId = valuesWithId.First(t => IsStringEqual(t.Value, change.Value)).Id;
                uValue.DateModified = DateTimeOffset.UtcNow;
            }
        }


        private List<KeyValuePair<string, string?>> GetChangesInUnit(Dictionary<string, string?> properties, Unit unit)
        {
            return properties.Where(t =>
                            !unit.UnitValues.Any(
                                uv => uv.Field!.AihitName.ToLower() == Sanitize(t.Key.ToLower()) && (
                                    (t.Value == null) ?
                                        uv.Value?.Value == null :
                                        ((uv.Value?.Value == null) ? null : uv.Value!.Value!.ToLower()) == Sanitize(t.Value.ToLower())
                                    )
                                )
                            ).ToList();
        }


        private async Task SyncValuesAsync(Dictionary<string, string?> properties)
        {
            // все поля из АИХИТ
            var valuesFromAihit = properties.Select(t => t.Value?.Trim()).Distinct();

            // список values для поиска в БД без null 
            var valuesFromAihitWithoutNull = valuesFromAihit.Where(x => x != null).Select(t => t!.ToLower()).ToList();

            var valuesInDb = await unitFieldValueService.Get().Where(t =>
                            (t.Value != null &&
                                        valuesFromAihitWithoutNull.Any(x => x == t.Value.ToLower())
                            )
                                || (t.Value == null)
                    ).Select(t => t.Value)
                    .ToListAsync();

            if (!valuesFromAihit.Any(x => x == null))
                valuesInDb.Remove(null);

            var newValues = valuesFromAihit.Where(t => !valuesInDb.Any(x => IsStringEqual(x, t))).ToList();

            if (newValues.Any())
            {
                foreach (var item in newValues)
                {
                    var value = new UnitFieldValue
                    {
                        Id = Guid.NewGuid(),
                        DateCreated = DateTimeOffset.UtcNow,
                        Value = Sanitize(item)
                    };

                    if (!await unitFieldValueService.CreateAsync(value))
                        logger.LogError($"Не удалось создать запись в таблице FieldValues: {item}, {value.ToJson()}");
                    else
                        logger.LogInformation($"Создана запись а таблице FieldValues: {item}, {value.ToJson()}");
                }
                if (!await unitFieldValueService.CommitAsync())
                    logger.LogError($"Не удалось применить изменения по добавлению новых Fields в базе данных");
            }
        }


        private async Task SyncFieldsAsync(Dictionary<string, string?> properties)
        {
            var fields = properties.Select(t => t.Key.Trim());
            var newFields = fields.Where(t => !unitFieldService.Get().Any(f => f.AihitName.ToLower() == t.ToLower()));
            if (newFields.Any())
            {
                foreach (var item in newFields)
                {
                    var field = new UnitField
                    {
                        Id = Guid.NewGuid(),
                        AihitName = Sanitize(item)!,
                        EsppName = null,
                    };

                    if (!await unitFieldService.CreateAsync(field))
                        logger.LogError($"Не удалось создать запись в таблице Fields: {item}, {field.ToJson()}");
                    else
                        logger.LogInformation($"Создана запись а таблице Fields: {item}, {field.ToJson()}");
                }
                if (!await unitFieldService.CommitAsync())
                    logger.LogError($"Не удалось применить изменения по добавлению новых Fields в базе данных");
            }
        }


        private string? Sanitize(string? value)
        {
            var _value = value?.Trim();
            return _value;
        }


        private bool IsStringEqual(string? value1, string? value2)
        {
            var _value1 = value1?.ToLower().Trim();
            var _value2 = value2?.ToLower().Trim();
            return _value1 == _value2;
        }


        private async Task<Unit> GetUnit(string name)
        {
            var unit = await GetUnitByName(name.Trim());

            if (unit == null)
                unit = await CreateUnitAsync(name);

            return unit;
        }

        private async Task<Unit> CreateUnitAsync(string name)
        {
            var unit = new Unit { Name = name.Trim() };

            if (!await unitService.CreateAsync(unit) || !await unitService.CommitAsync())
                logger.LogError($"Не удалось создать Unit {unit.Name}");
            else
                logger.LogInformation($"----- Создан Unit: {unit.Name}  -----");

            return unit;
        }


        public async Task<Unit?> GetUnitByName(string name)
        {
            return await GetUnitWithFieldsAndValues()
                .FirstOrDefaultAsync(u => u.Name.ToLower() == name.ToLower());
        }


        private IQueryable<Unit> GetUnitWithFieldsAndValues()
        {
            return unitService.Get()
                        .Include(t => t.UnitValues)
                            .ThenInclude(uv => uv.Field)
                        .Include(t => t.UnitValues)
                            .ThenInclude(uf => uf.Value);
        }
    }
}