using CarCareTracker.External.Interfaces;
using CarCareTracker.Models;
using Npgsql;
using System.Text.Json;

namespace CarCareTracker.External.Implementations
{
    public class PGUserConfigDataAccess: IUserConfigDataAccess
    {
        private NpgsqlDataSource pgDataSource;
        private readonly ILogger<PGUserConfigDataAccess> _logger;
        private static string tableName = "userconfigrecords";
        public PGUserConfigDataAccess(IConfiguration config, ILogger<PGUserConfigDataAccess> logger)
        {
            pgDataSource = NpgsqlDataSource.Create(config["POSTGRES_CONNECTION"]);
            _logger = logger;
            try
            {
                //create table if not exist.
                string initCMD = $"CREATE SCHEMA IF NOT EXISTS app; CREATE TABLE IF NOT EXISTS app.{tableName} (id INT primary key, data jsonb not null)";
                using (var ctext = pgDataSource.CreateCommand(initCMD))
                {
                    ctext.ExecuteNonQuery();
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
            }
        }
        public UserConfigData GetUserConfig(int userId)
        {
            try
            {
                string cmd = $"SELECT data FROM app.{tableName} WHERE id = @id";
                UserConfigData result = null;
                using (var ctext = pgDataSource.CreateCommand(cmd))
                {
                    ctext.Parameters.AddWithValue("id", userId);
                    using (NpgsqlDataReader reader = ctext.ExecuteReader())
                        while (reader.Read())
                        {
                            UserConfigData userConfig = JsonSerializer.Deserialize<UserConfigData>(reader["data"] as string);
                            result = userConfig;
                        }
                }
                return result;
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
                return new UserConfigData();
            }
        }
        public bool SaveUserConfig(UserConfigData userConfigData)
        {
            var existingRecord = GetUserConfig(userConfigData.Id);
            try
            {
                if (existingRecord == null)
                {
                    string cmd = $"INSERT INTO app.{tableName} (id, data) VALUES(@id, CAST(@data AS jsonb))";
                    using (var ctext = pgDataSource.CreateCommand(cmd))
                    {
                        var serializedData = JsonSerializer.Serialize(userConfigData);
                        ctext.Parameters.AddWithValue("id", userConfigData.Id);
                        ctext.Parameters.AddWithValue("data", serializedData);
                        return ctext.ExecuteNonQuery() > 0;
                    }
                }
                else
                {
                    string cmd = $"UPDATE app.{tableName} SET data = CAST(@data AS jsonb) WHERE id = @id";
                    using (var ctext = pgDataSource.CreateCommand(cmd))
                    {
                        var serializedData = JsonSerializer.Serialize(userConfigData);
                        ctext.Parameters.AddWithValue("id", userConfigData.Id);
                        ctext.Parameters.AddWithValue("data", serializedData);
                        return ctext.ExecuteNonQuery() > 0;
                    }
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
                return false;
            }
        }
        public bool DeleteUserConfig(int userId)
        {
            try
            {
                string cmd = $"DELETE FROM app.{tableName} WHERE id = @id";
                using (var ctext = pgDataSource.CreateCommand(cmd))
                {
                    ctext.Parameters.AddWithValue("id", userId);
                    ctext.ExecuteNonQuery();
                    return true;
                }
            }
            catch (Exception ex)
            {
                _logger.LogError(ex.Message);
                return false;
            }
        }
    }
}