using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using ChaosBot.Database.Repository;
using Microsoft.Data.Sqlite;
using Microsoft.Extensions.Configuration;
using Microsoft.VisualBasic;
using NLog;

namespace ChaosBot.Database
{
    public static class Controller
    {
        static SqliteConnection _conn = new SqliteConnection($"Data Source={System.IO.Directory.GetCurrentDirectory()}/{ConfigurationRepository.GetValue<string>("Bot:Database")}");
        private static ILogger _logger = Program.Logger;
        
        /// <summary>
        /// Run a raw query on the database
        /// </summary>
        /// <code>
        ///     string query = "TRUNCATE SomeTable";
        ///     Controller.RawQuery(query);
        /// </code>
        /// <param name="query">Raw query to execute</param>
        /// <param name="readOutput">Whether to read the output and return it as a <c>DataFrame</c></param>
        /// <param name="throwError">Whether to throw any exceptions or to log and shrug.</param>
        /// <returns></returns>
        public static DataTable RawQuery(string query, Dictionary<string, object> parameters = null, bool readOutput = true, bool throwError = false)
        {
            DataTable dt = new DataTable();
            
            try
            {
                using (_conn)
                {
                    // Open the SQLite connection
                    _conn.Open();

                    // Start creating the command and assign the query given
                    SqliteCommand cmd = _conn.CreateCommand();
                    cmd.CommandText = query;

                    // Add parameters if they exist
                    if (parameters != null)
                    {
                        foreach (var parameter in parameters)
                        {
                            cmd.Parameters.AddWithValue(parameter.Key, parameter.Value);
                        }
                    }
                    
                    // Prepare the statement
                    _logger.Trace($"Database.Controller.RawQuery: Running query {cmd.CommandText}");
                    cmd.Prepare();
                    
                    if (readOutput)
                    {
                        // output needs to be read, make a reader and fill the datatable with the data
                        SqliteDataReader executeReader = cmd.ExecuteReader();
                        dt.Load(executeReader);
                    }
                    else
                    {
                        // output does not need to be read, just run the query without reading
                        cmd.ExecuteNonQuery();
                    }

                    // Clean up after ourselves
                    _conn.Close();
                }
            }
            catch (Exception ex)
            {
                if (throwError)
                {
                    // If we throw any exception, just throw it so other code can handle it
                    throw;
                }

                // We handle the exception, log it and be done
                _logger.Fatal($"Database.Controller.RawQuery: Exception [{ex}] thrown, <[{ex.Message}]>.");
            }
            
            return dt;
        }
    }
}