using Infrastructure;
using Server.Dto.Request;
using Server.Dto.Response;
using Server.IServices;
using Shared.Criteria;
using Server.Mappers;

namespace Server.Services;

public class FormationServices(AlumniDbContext context) : IFormationsService
{
    public Task<ResponseFormationDto?> GetFormationById(string id)
    {
        var result = context.Formations.FirstOrDefault(form => form.Id == id);
        return Task.FromResult(result?.ToDto());
    }

    public Task<(long Count, IEnumerable<ResponseFormationDto> Formations)> GetFormations(string? name, int page, int size,
        FormationOrderCriteria orderCriteria = FormationOrderCriteria.EndDate, bool ascending = true)
    {
        var query = context.Formations.Skip((page-1) * size).Take(size);
        if (name != null)
        {
            query = context.Formations.Where(e => e.Name.Contains(name)).Skip((page-1) * size).Take(size);
        }
        switch (orderCriteria)
        {
            case FormationOrderCriteria.StartDate:
                query = ascending ? query.OrderBy(e => e.StartDate) : query.OrderByDescending(e => e.StartDate);
                break;
            case FormationOrderCriteria.EndDate:
                query = ascending ? query.OrderBy(e => e.EndDate) : query.OrderByDescending(e => e.EndDate);
                break;
            case FormationOrderCriteria.Name:
                query = ascending ? query.OrderBy(e => e.Name) : query.OrderByDescending(e => e.Name);
                break;
            case FormationOrderCriteria.SchoolName:
                query = ascending ? query.OrderBy(e => e.SchoolName) : query.OrderByDescending(e => e.SchoolName);
                break;
        }
        var count = query.LongCount();
        return Task.FromResult((count, query.AsEnumerable().Select(e => e.ToDto())));
    }

    public Task<ResponseFormationDto?> CreateFormation(RequestFormationDto formation)
    {
        var result = context.Formations.AddAsync(formation.ToEntity());
        var alica =   context.Alumni.FirstOrDefault(a => a.Id == formation.AlumniId);
        alica?.Formations.Add(result.Result.Entity);
        context.SaveChangesAsync();
        return Task.FromResult(result.Result.Entity.ToDto());
    }

    public Task<ResponseFormationDto?> UpdateFormation(string id, RequestFormationDto formation)
    {
        var result = context.Formations.FirstOrDefault(e => e.Id == id);
        if (result == null)
        {
            return Task.FromResult<ResponseFormationDto?>(null);
        }
        result.SchoolName = formation.SchoolName;
        result.Name = formation.Name;
        result.StartDate = formation.StartingDate;
        result.EndDate = formation.EndingDate;
        result.IsCurrent = formation.CurrentFormation;

        context.SaveChangesAsync();
        return Task.FromResult(result.ToDto());
    }

    public Task<bool> DeleteFormation(string id)
    {
        var result = context.Formations.FirstOrDefault(form => form.Id == id);
        if (result == null) return Task.FromResult(false);
        context.Formations.Remove(result);
        context.SaveChangesAsync();
        return Task.FromResult(true);
    }
}