using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Erp.Notifications.Domain;
using Erp.Notifications.Entities;
using Erp.Notifications.Enums;
using Microsoft.AspNetCore.Authorization;
using Microsoft.EntityFrameworkCore;
using Volo.Abp.Application.Dtos;
using Volo.Abp.Application.Services;
using Volo.Abp.Domain.Repositories;
using Volo.Abp.Identity;

namespace Erp.Notifications.NotificationRules;

[Authorize]
public class NotificationRuleAppService : CrudAppService<
    NotificationRule,
    NotificationRuleDto,
    Guid,
    PagedAndSortedResultRequestDto,
    CreateUpdateNotificationRuleDto>,
    INotificationRuleAppService
{
    private readonly IdentityUserManager userManager;
    private readonly IIdentityUserRepository repositoryUser;
    private readonly IOrganizationUnitRepository repositoryOrganizationUnit;

    public NotificationRuleAppService(
        IRepository<NotificationRule, Guid> repository,
        IdentityUserManager userManager,
        IIdentityUserRepository repositoryUser,
        IOrganizationUnitRepository repositoryOrganizationUnit
    ) : base(repository)
    {
        this.userManager = userManager;
        this.repositoryUser = repositoryUser;
        this.repositoryOrganizationUnit = repositoryOrganizationUnit;
    }

    public string[] GetNotificationTypes()
    {
        return NotificationTypes.GetAll();
    }

    private void GetAllParentCodes(string code, List<string>? codes)
    {
        codes ??= [];
        var parentCode = OrganizationUnit.GetParentCode(code);
        codes.Add(parentCode);
        if (parentCode is null)
        {
            return;
        }
        else
        {
            GetAllParentCodes(parentCode, codes);
        }
    }

    protected override async Task<IQueryable<NotificationRule>> CreateFilteredQueryAsync(PagedAndSortedResultRequestDto input)
    {
        // Bir kullanıcının ait olduğu organization unit'lerin her bir parentının kodu lazım
        // Böylece bir kullanıcının üst birimleri de dahil alabileceği tüm bildirim tiplerini listeleyebileceğiz
        var organizationUnits = await repositoryUser.GetOrganizationUnitsAsync(CurrentUser.Id!.Value);
        var organizationUnitCodes = organizationUnits.Select(a => a.Code).ToList(); //01.02.03, 43.44.45
        var ouCodes = new List<string>();
        foreach (var code in organizationUnitCodes)
        {
            GetAllParentCodes(code, ouCodes);
        }
        ouCodes = ouCodes.Distinct().ToList();

        var query = await base.CreateFilteredQueryAsync(input);
        return query.Where(a =>
            a.RecipientType == NotificationRecipientTypes.User && a.RecipientId == CurrentUser.UserName ||
            a.RecipientType == NotificationRecipientTypes.Role && CurrentUser.Roles.Contains(a.RecipientId) ||
            a.RecipientType == NotificationRecipientTypes.OrganizationUnit && ouCodes.Contains(a.RecipientId) ||
            a.RecipientType == NotificationRecipientTypes.All);
    }

    public async Task<string[]> GetMyNotificationTypesAsync()
    {
        var query = await CreateFilteredQueryAsync(new PagedAndSortedResultRequestDto());
        return await query.Select(a => a.NotificationType).Distinct().ToArrayAsync();
    }

    public async Task<List<NotificationRuleDto>> GetMyNotificationRules()
    {
        var query = await CreateFilteredQueryAsync(new PagedAndSortedResultRequestDto());
        var all = await query.ToListAsync();
        var list = all
            .GroupBy(a => new { a.NotificationType, a.Channel })
            .Select(a =>
            {
                var item = a.FirstOrDefault(a => a.IsFixed)
                        ?? a.FirstOrDefault(a => a.IsCustomized)
                        ?? a.FirstOrDefault(a => a.IsActive)
                        ?? a.First();
                return new NotificationRuleDto
                {
                    Id = item.Id,
                    NotificationType = a.Key.NotificationType,
                    Channel = a.Key.Channel,
                    IsActive = item.IsActive,
                    IsFixed = item.IsFixed,
                    IsCustomized = item.IsCustomized,
                };
            })
            .ToList();

        return list;
    }

    public async Task PostMyNotificationRule(CreateUpdateNotificationRuleDto Input)
    {
        var query = await CreateFilteredQueryAsync(new PagedAndSortedResultRequestDto());
        var item = await query.FirstOrDefaultAsync(a =>
            a.RecipientType == NotificationRecipientTypes.User &&
            a.RecipientId == CurrentUser.UserName &&
            a.IsCustomized &&
            a.Channel == Input.Channel &&
            a.NotificationType == Input.NotificationType);
        if (item is null)
        {
            // insert
            item = new NotificationRule
            {
                NotificationType = Input.NotificationType,
                RecipientType = NotificationRecipientTypes.User,
                RecipientId = CurrentUser.UserName,
                Channel = Input.Channel,
                IsActive = Input.IsActive,
                IsFixed = false,
                IsCustomized = true
            };
            await Repository.InsertAsync(item);
        }
        else
        {
            item.IsActive = Input.IsActive;
            await Repository.UpdateAsync(item);
        }
    }

    public async Task DeleteMyNotificationRules(string NotificationType)
    {
        var query = await CreateFilteredQueryAsync(new PagedAndSortedResultRequestDto());
        var items = await query.Where(a =>
            a.RecipientType == NotificationRecipientTypes.User &&
            a.RecipientId == CurrentUser.UserName &&
            a.IsCustomized &&
            a.NotificationType == NotificationType)
            .ToListAsync();
        await Repository.DeleteManyAsync(items);
    }
}

/*
var defaultRules = await query.Where(a => !a.IsCustomized && a.IsActive)
            .GroupBy(a => new { a.NotificationType, a.Channel })
            .Select(a => new NotificationRuleDto
            {
                Id = a.FirstOrDefault(a => a.UserId != null)?.Id ?? a.First().Id,
                NotificationType = a.Key.NotificationType,
                Channel = a.Key.Channel,
                IsActive = a.First().IsActive,
                IsFixed = a.First().IsFixed,
                IsCustomized = a.First().IsCustomized,
            })
            .ToListAsync();
var customizedRules = await query.Where(a => a.IsCustomized)
    .Select(a => new NotificationRuleDto
    {
        Id = a.Id,
        NotificationType = a.NotificationType,
        Channel = a.Channel,
        IsActive = a.IsActive,
        IsFixed = a.IsFixed,
        IsCustomized = a.IsCustomized
    })
    .ToListAsync();

//defaultRules.IsFixed
//customizedRules - defaultRules.IsFixed
//!defaultRules.IsFixed - customizedRules
var list = new List<NotificationRuleDto>();
list.AddRange(defaultRules.Where(a => a.IsFixed).ToList());
        list.AddRange(customizedRules.Where(a => !list.Any(b => b.NotificationType == a.NotificationType && b.Channel == a.Channel)).ToList());
        list.AddRange(defaultRules.Where(a => !a.IsFixed && !list.Any(b => b.NotificationType == a.NotificationType && b.Channel == a.Channel)).ToList());

*/