using Microsoft.EntityFrameworkCore;
using Portfolio.Domain.Features.Pokemon;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Portfolio.Infrastructure.Repositories
{
    public class PokemonRepository : IPokemonRepository
    {
        private readonly ApplicationDbContext _context;

        public PokemonRepository(ApplicationDbContext context)
        {
            _context = context;
        }

        public async Task<List<Pokemon>> GetAllPokemonsAsync()
        {
            return await _context.Pokemons.ToListAsync();
        }
        public async Task<Pokemon> GetPokemonByPokemonIdAsync(int id)
        {
            return await _context.Pokemons.FirstOrDefaultAsync(p => p.PokemonId == id);
        }
        public async Task<Pokemon> GetPokemonByIdAsync(int id)
        {
            return await _context.Pokemons.FirstOrDefaultAsync(p => p.Id == id);
        }
        public async Task AddPokemonAsync(Pokemon pokemon)
        {
            _context.Pokemons.Add(pokemon);
            await _context.SaveChangesAsync();
        }
        public async Task DeletePokemonAsync(int pokemonId)
        {
            var pokemon = await _context.Pokemons.FindAsync(pokemonId);
            if (pokemon != null)
            {
                _context.Pokemons.Remove(pokemon);
                await _context.SaveChangesAsync();
            }
        }

        public async Task UpdatePokemonAsync(Pokemon pokemon)
        {
            _context.Pokemons.Update(pokemon);
            await _context.SaveChangesAsync();
        }

        public async Task<int?> GetPreviousPokemonIdAsync(int currentPokemonId)
        {
            // Get the previous Pokémon's PokemonId
            var prevPokemonId = await _context.Pokemons
                .Where(p => p.PokemonId < currentPokemonId)
                .OrderByDescending(p => p.PokemonId)
                .Select(p => (int?)p.PokemonId)
                .FirstOrDefaultAsync();

            // If no previous PokemonId is found, wrap around to the last one
            if (prevPokemonId == null)
            {
                prevPokemonId = await _context.Pokemons
                    .OrderByDescending(p => p.PokemonId)  // Get the last PokemonId
                    .Select(p => (int?)p.PokemonId)
                    .FirstOrDefaultAsync();
            }

            return prevPokemonId;
        }

        public async Task<int?> GetNextPokemonIdAsync(int currentPokemonId)
        {
            // Get the next Pokémon's PokemonId
            var nextPokemonId = await _context.Pokemons
                .Where(p => p.PokemonId > currentPokemonId)
                .OrderBy(p => p.PokemonId)
                .Select(p => (int?)p.PokemonId)
                .FirstOrDefaultAsync();

            // If no next PokemonId is found, wrap around to the first one
            if (nextPokemonId == null)
            {
                nextPokemonId = await _context.Pokemons
                    .OrderBy(p => p.PokemonId)  // Get the first PokemonId
                    .Select(p => (int?)p.PokemonId)
                    .FirstOrDefaultAsync();
            }

            return nextPokemonId;
        }

        public async Task<List<int>> GetAllPokemonIdsAsync()
        {
            return await _context.Pokemons
                .OrderBy(p => p.PokemonId)  // Ensure it's ordered by PokemonId
                .Select(p => p.PokemonId)
                .ToListAsync();
        }

        public async Task<int?> GetVariationPokemonIdAsync(int pokemonId)
        {
            // Find a variation for the given PokemonId (where IsVariation is true)
            var variation = await _context.Pokemons
                .Where(p => p.PokemonId == pokemonId && p.IsVariation)
                .FirstOrDefaultAsync();

            // Return the Id of the variation, or null if no variation is found
            return variation?.Id;
        }


    }
}
