using System.Collections.Generic;
using System.Data.Common;
using System.Globalization;
using Microsoft.EntityFrameworkCore;
using NadekoBot.Core.Common.Configs;
using Serilog;
using SixLabors.ImageSharp.PixelFormats;

namespace NadekoBot.Core.Services
{
    public sealed class BotConfigMigrator : IConfigMigrator
    {
        private readonly DbService _db;
        private readonly BotConfigService _bss;

        public BotConfigMigrator(DbService dbService, BotConfigService bss)
        {
            _db = dbService;
            _bss = bss;
        }

        public void EnsureMigrated()
        {
            using var uow = _db.GetDbContext();
            using var conn = uow._context.Database.GetDbConnection();
            
            // check if bot config exists
            using (var checkTableCommand = conn.CreateCommand())
            {
                // make sure table still exists
                checkTableCommand.CommandText =
                    "SELECT name FROM sqlite_master WHERE type='table' AND name='BotConfig';";
                var checkReader = checkTableCommand.ExecuteReader();
                if (!checkReader.HasRows)
                    return;
            }
            
            MigrateBotConfig(conn);

            using var dropBlockedTable = conn.CreateCommand();
            dropBlockedTable.CommandText = "DROP TABLE IF EXISTS BlockedCmdOrMdl;";
            dropBlockedTable.ExecuteNonQuery();
        }

        private void MigrateBotConfig(DbConnection conn)
        {
            

            using (var checkMigratedCommand = conn.CreateCommand())
            {
                checkMigratedCommand.CommandText =
                    "UPDATE BotConfig SET HasMigratedBotSettings = 1 WHERE HasMigratedBotSettings = 0;";
                var changedRows = checkMigratedCommand.ExecuteNonQuery();
                if (changedRows == 0)
                    return;
            }

            Log.Information("Migrating bot settings...");

            var blockedCommands = new HashSet<string>();
            using (var cmdCom = conn.CreateCommand())
            {
                cmdCom.CommandText = $"SELECT Name from BlockedCmdOrMdl WHERE BotConfigId is not NULL";
                var cmdReader = cmdCom.ExecuteReader();
                while (cmdReader.Read())
                    blockedCommands.Add(cmdReader.GetString(0));
            }

            var blockedModules = new HashSet<string>();
            using (var mdlCom = conn.CreateCommand())
            {
                mdlCom.CommandText = $"SELECT Name from BlockedCmdOrMdl WHERE BotConfigId is NULL";
                var mdlReader = mdlCom.ExecuteReader();
                while (mdlReader.Read())
                    blockedModules.Add(mdlReader.GetString(0));
            }

            using var com = conn.CreateCommand();
            com.CommandText = $@"SELECT DefaultPrefix, ForwardMessages, ForwardToAllOwners,
OkColor, ErrorColor, ConsoleOutputType, DMHelpString, HelpString, RotatingStatuses, Locale, GroupGreets
FROM BotConfig";

            using var reader = com.ExecuteReader();
            if (!reader.Read())
                return;

            _bss.ModifyConfig((x) =>
            {
                x.Prefix = reader.GetString(0);
                x.ForwardMessages = reader.GetBoolean(1);
                x.ForwardToAllOwners = reader.GetBoolean(2);
                x.Color = new ColorConfig()
                {
                    Ok = Rgba32.TryParseHex(reader.GetString(3), out var okColor)
                        ? okColor
                        : Rgba32.ParseHex("00e584"),
                    Error = Rgba32.TryParseHex(reader.GetString(4), out var errorColor)
                        ? errorColor
                        : Rgba32.ParseHex("ee281f"),
                };
                x.ConsoleOutputType = (ConsoleOutputType) reader.GetInt32(5);
                x.DmHelpText = reader.IsDBNull(6) ? string.Empty : reader.GetString(6);
                x.HelpText = reader.IsDBNull(7) ? string.Empty : reader.GetString(7);
                x.RotateStatuses = reader.GetBoolean(8);
                try
                {
                    x.DefaultLocale = new CultureInfo(reader.GetString(9));
                }
                catch
                {
                    x.DefaultLocale = new CultureInfo("en-US");
                }

                x.GroupGreets = reader.GetBoolean(10);
                x.Blocked.Commands = blockedCommands;
                x.Blocked.Modules = blockedModules;
            });

            Log.Information("Data written to data/bot.yml");
        }
    }
}