using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Dynamic.Core;
using System.Threading.Tasks;
using Sozsoft.Languages.Entities;
using Sozsoft.Platform.Entities;
using Sozsoft.Platform.Extensions;
using Microsoft.AspNetCore.Authorization;
using Microsoft.Extensions.Logging;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.PermissionManagement;
using Volo.Abp.TenantManagement;
using static Sozsoft.Platform.Data.Seeds.SeedConsts;
using Sozsoft.Languages;

namespace Sozsoft.Platform.Menus;

[Authorize]
public class MenuAppService : CrudAppService<
    Menu,
    MenuDto,
    Guid,
    PagedAndSortedResultRequestDto>
{
    private readonly IRepository<Menu, Guid> _menuRepository;
    private readonly IRepository<LanguageKey, Guid> _repositoryKey;
    private readonly IRepository<LanguageText, Guid> _repositoryText;
    private readonly ITenantRepository _tenantRepository;
    private readonly IPermissionDefinitionRecordRepository _permissionRepository;

    public MenuAppService(
        IRepository<Menu, Guid> menuRepository,
        IRepository<LanguageKey, Guid> languageKeyRepository,
        IRepository<LanguageText, Guid> languageTextRepository,
        ITenantRepository tenantRepository,
        IPermissionDefinitionRecordRepository permissionRepository
        ) : base(menuRepository)
    {
        _menuRepository = menuRepository;
        _repositoryKey = languageKeyRepository;
        _repositoryText = languageTextRepository;
        _tenantRepository = tenantRepository;
        _permissionRepository = permissionRepository;

        CreatePolicyName = $"{AppCodes.Menus.Menu}.Create";
        UpdatePolicyName = $"{AppCodes.Menus.Menu}.Update";
        DeletePolicyName = $"{AppCodes.Menus.Menu}.Delete";
    }

    public override async Task<PagedResultDto<MenuDto>> GetListAsync(PagedAndSortedResultRequestDto input)
    {
        await CheckGetListPolicyAsync();

        var query = await CreateFilteredQueryAsync(input);
        query = query.Where(a => !a.IsDisabled);

        //Tenant üzerinden MenuGrup bilgisi alınıp sadece o menüler listelenecek
        if (CurrentTenant.IsAvailable)
        {
            var tenant = await _tenantRepository.FindAsync(CurrentTenant.Id.Value);
            if (tenant != null)
            {
                var tenantMenuGroup = tenant.GetMenuGroup();
                if (!tenantMenuGroup.IsNullOrWhiteSpace())
                {
                    var permissionRecords = await _permissionRepository.GetListAsync();
                    var allowedPermissionNames = permissionRecords
                        .Where(p => p.GetMenuGroup().Contains(tenantMenuGroup))
                        .Select(p => p.Name)
                        .Distinct()
                        .ToList();

                    query = query.Where(menu =>
                        string.IsNullOrEmpty(menu.RequiredPermissionName) ||
                        allowedPermissionNames.Contains(menu.RequiredPermissionName));
                }

            }
        }

        var totalCount = await AsyncExecuter.CountAsync(query);

        var entities = new List<Menu>();
        var entityDtos = new List<MenuDto>();

        if (totalCount > 0)
        {
            query = ApplySorting(query, input);
            query = ApplyPaging(query, input);

            var items = await AsyncExecuter.ToListAsync(query);

            // Tüm unique permission'ları topla
            var uniquePermissions = items
                .Where(x => !string.IsNullOrWhiteSpace(x.RequiredPermissionName))
                .Select(x => x.RequiredPermissionName)
                .Distinct()
                .ToList();

            // Tüm permission'ları bir kerede kontrol et (N+1 query problemini önler)
            var grantedPermissions = new HashSet<string>();
            foreach (var permission in uniquePermissions)
            {
                try
                {
                    if (await AuthorizationService.IsGrantedAsync(permission))
                    {
                        grantedPermissions.Add(permission);
                    }
                }
                catch (Exception ex)
                {
                    Logger.LogError(ex, $"Permission error for {permission}: {ex.Message}");
                }
            }

            // Sadece yetkili menüleri filtrele
            entities = items
                .Where(item => string.IsNullOrWhiteSpace(item.RequiredPermissionName) ||
                              grantedPermissions.Contains(item.RequiredPermissionName))
                .ToList();

            entityDtos = await base.MapToGetListOutputDtosAsync(entities);
        }

        return new PagedResultDto<MenuDto>(
            totalCount,
            entityDtos
        );
    }

    public override async Task<MenuDto> CreateAsync(MenuDto input)
    {
        await CheckCreatePolicyAsync();

        var keyExists = await _repositoryKey.AnyAsync(
            a => a.Key == input.DisplayName &&
            a.ResourceName == PlatformConsts.AppName);
        if (!keyExists)
        {
            await _repositoryKey.InsertAsync(new LanguageKey
            {
                Key = input.DisplayName,
                ResourceName = PlatformConsts.AppName
            });
        }

        return await base.CreateAsync(input);
    }

    public override async Task<MenuDto> UpdateAsync(Guid id, MenuDto input)
    {
        await CheckUpdatePolicyAsync();

        var key = await _repositoryKey.FirstOrDefaultAsync(
            a => a.Key == input.DisplayName &&
            a.ResourceName == PlatformConsts.AppName);

        if (key is null)
        {
            // Yeni Key'i olustur
            await _repositoryKey.InsertAsync(new LanguageKey
            {
                Key = input.DisplayName,
                ResourceName = PlatformConsts.AppName
            });
        }

        return await base.UpdateAsync(id, input);
    }

    public async Task<List<MenuDto>> UpdateAllAsync(List<MenuDto> inputs)
    {
        await CheckUpdatePolicyAsync();

        if (!inputs.Any())
            return new List<MenuDto>();

        // Id kontrolü
        if (inputs.Any(x => x.Id == Guid.Empty))
        {
            throw new ArgumentException("MenuDto içinde geçerli bir Id bulunmalıdır.");
        }

        // Tüm DisplayName'leri topla
        var displayNames = inputs.Select(x => x.DisplayName).Distinct().ToList();

        // Mevcut key'leri tek sorguda getir
        var existingKeys = await AsyncExecuter.ToListAsync(
            (await _repositoryKey.GetQueryableAsync())
                .Where(a => displayNames.Contains(a.Key) && a.ResourceName == PlatformConsts.AppName));

        var existingKeyNames = existingKeys.Select(x => x.Key).ToHashSet();

        // Eksik key'leri toplu ekle
        var newKeys = displayNames
            .Where(name => !existingKeyNames.Contains(name))
            .Select(name => new LanguageKey
            {
                Key = name,
                ResourceName = PlatformConsts.AppName
            })
            .ToList();

        if (newKeys.Any())
        {
            await _repositoryKey.InsertManyAsync(newKeys, autoSave: true);
        }

        // Menüleri güncelle
        var result = new List<MenuDto>();
        foreach (var input in inputs)
        {
            var updated = await base.UpdateAsync(input.Id, input);
            result.Add(updated);
        }

        return result;
    }

    public override async Task DeleteAsync(Guid id)
    {
        await CheckDeletePolicyAsync();

        var menu = await _menuRepository.GetAsync(id);
        if (menu != null)
        {
            await _repositoryKey.DeleteAsync(
                a => a.Key == menu.DisplayName &&
                a.ResourceName == PlatformConsts.AppName);
        }

        await base.DeleteAsync(id);
    }

    public async Task<List<MenuDto>> GetListMainMenuAsync()
    {
        await CheckGetPolicyAsync();

        var query = await _menuRepository.GetQueryableAsync();
        query = query.Where(a => !a.IsDisabled && a.ShortName != null);

        var entities = await AsyncExecuter.ToListAsync(query);
        var entityDtos = await MapToGetListOutputDtosAsync(entities);

        return entityDtos;
    }

    public async Task<MenuDto> CreateWithLanguageKeyTextAsync(MenuDto input)
    {
        await CheckCreatePolicyAsync();

        //Dil Key oluşturuluyor.
        var keyExists = await _repositoryKey.AnyAsync(
            a => a.Key == input.Code &&
            a.ResourceName == PlatformConsts.AppName);
        if (!keyExists)
        {
            await _repositoryKey.InsertAsync(new LanguageKey
            {
                Key = input.Code,
                ResourceName = PlatformConsts.AppName
            }, autoSave: true);
        }

        // English text oluşturuluyor veya güncelleniyor.
        var existingEnText = await _repositoryText.FirstOrDefaultAsync(
            a => a.CultureName == "en" &&
            a.Key == input.Code &&
            a.ResourceName == PlatformConsts.AppName);

        if (existingEnText != null)
        {
            existingEnText.Value = input.MenuTextEn;
            await _repositoryText.UpdateAsync(existingEnText);
        }
        else
        {
            await _repositoryText.InsertAsync(new LanguageText
            {
                Key = input.Code,
                CultureName = "en",
                Value = input.MenuTextEn,
                ResourceName = PlatformConsts.AppName
            });
        }

        // Türkçe text oluşturuluyor veya güncelleniyor.
        var existingTrText = await _repositoryText.FirstOrDefaultAsync(
            a => a.CultureName == "tr" &&
            a.Key == input.Code &&
            a.ResourceName == PlatformConsts.AppName);

        if (existingTrText != null)
        {
            existingTrText.Value = input.MenuTextTr;
            await _repositoryText.UpdateAsync(existingTrText);
        }
        else
        {
            await _repositoryText.InsertAsync(new LanguageText
            {
                Key = input.Code,
                CultureName = "tr",
                Value = input.MenuTextTr,
                ResourceName = PlatformConsts.AppName
            });
        }

        return await base.CreateAsync(input);
    }
}