using System;
using System.Collections.Generic;
using Npgsql;
using PI_Assync_PLD.Models;
using Windows.Devices.Sensors;

public class PostgresRepository : IDataRepository
    {
        private readonly string _connectionString;

        public PostgresRepository(string environment)
        {
            _connectionString = environment == "dev"
                ? "Server=smart-energia-dev-pgsql.cykff7tj7mik.us-east-1.rds.amazonaws.com; Port=5432; Database=smartimptest; User Id=postgres; Password=VfHml#Z78!%kvvNM;"
                : "Server=smart-energia-dev-pgsql.cykff7tj7mik.us-east-1.rds.amazonaws.com; Port=5432; Database=smartenergiaprod; User Id=postgres; Password=VfHml#Z78!%kvvNM;";
        }

        public DateTime ObterDataInicial()
        {
            using var conn = new NpgsqlConnection(_connectionString);
            conn.Open();

            string query = "SELECT TO_DATE('1899-12-30', 'YYYY-MM-DD') + INTERVAL '1' DAY * MAX(dia_num) AS ultimo_dia FROM pld";
            using var cmd = new NpgsqlCommand(query, conn);
            using var reader = cmd.ExecuteReader();

            return reader.Read() && DateTime.TryParse(reader["ultimo_dia"]?.ToString(), out var data)
                ? data.AddDays(1)
                : DateTime.Now.AddYears(-2);
        }

        public void SalvarPLDs(List<PLDModel> plds, DateTime ultimaData)
        {
            using var conn = new NpgsqlConnection(_connectionString);
            conn.Open();

            // Filtrar apenas os PLDs mais recentes
            var novosPLDs = plds.FindAll(pld => pld.Dia >= ultimaData);
            if (novosPLDs.Count == 0) return; // Nenhum dado novo, então sair da função

            using var transaction = conn.BeginTransaction();

            var sb = new System.Text.StringBuilder();
            sb.Append("INSERT INTO pld (dia_num, hora, submercado, valor, mes_ref, dia_da_semana) VALUES ");

            var parametros = new List<NpgsqlParameter>();
            int count = 0;

            foreach (var pld in novosPLDs)
            {
                sb.Append($"(@Dia{count}, @Hora{count}, @Submercado{count}, @Valor{count}, @MesRef{count}, @DiaSemana{count}),");

                parametros.Add(new NpgsqlParameter($"@Dia{count}", NpgsqlTypes.NpgsqlDbType.Integer) { Value = pld.Dia.ToOADate() });
                parametros.Add(new NpgsqlParameter($"@Hora{count}", NpgsqlTypes.NpgsqlDbType.Integer) { Value = pld.Hora });
                parametros.Add(new NpgsqlParameter($"@Submercado{count}", NpgsqlTypes.NpgsqlDbType.Text) { Value = pld.Submercado });
                parametros.Add(new NpgsqlParameter($"@Valor{count}", NpgsqlTypes.NpgsqlDbType.Double) { Value = pld.Valor });
                parametros.Add(new NpgsqlParameter($"@MesRef{count}", NpgsqlTypes.NpgsqlDbType.Text) { Value = pld.Mes });
                parametros.Add(new NpgsqlParameter($"@DiaSemana{count}", NpgsqlTypes.NpgsqlDbType.Integer) { Value = pld.DiaSemana });

                count++;
            }

            // Removemos a última vírgula da query
            sb.Length--;

            using var cmd = new NpgsqlCommand(sb.ToString(), conn, transaction);
            cmd.Parameters.AddRange(parametros.ToArray());

            cmd.ExecuteNonQuery();
            transaction.Commit();
        }
    }