using System;
using System.IO;
using System.Reflection;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.IO;
using Sarand.Net.Standard.Base.Utils;
using Sarand.Net.Standard.Dbas.Base;

namespace Sarand.Net.Standard.Dbas.ReferenceData
{
	//=======================================================================
	public static class SaReferenceDataDbDfnGenerator
	{
		//-------------------------------------------------------------------
		// Data members.
		private static string className = nameof(SaReferenceDataDbDfnGenerator);

		//-------------------------------------------------------------------
		/// <summary>
		/// Generate database definitions.
		/// </summary>
		public static bool Generate(String connectionString)
		{
			String fn = className + ".Generate";

			// Locate output folder:
			String directory = GetOutputFolder();
			if (String.IsNullOrEmpty(directory) || !FileUtil.IsDirectory(directory)) return false;

			// Open database.
			// NB Must be ODBC connection - especially to retrieve index columns.
			SacsDatabaseConsole.OdbcConfig config = new SacsDatabaseConsole.OdbcConfig();
			config.ConnectionString = connectionString;
			SacsDatabase database = SacsDatabaseConsole.OpenOdbcDatabase(config);

			// Generate database definition.
			try
			{
				return GenerateDatabaseDefinition(database, directory);
			}
			catch (Exception exc)
			{
				SaLogger.Error($"{fn} {ExceptionUtil.GetLogMessage(exc, "generating database definition")}");
			}
			return false;
		}

		//-------------------------------------------------------------------
		private static bool GenerateDatabaseDefinition(SacsDatabase database, String directory)
		{
			DatabaseDefinitionGenerator.Config config = new DatabaseDefinitionGenerator.Config()
			{
				SarandCommonVersion = DatabaseDefinitionGenerator.SarandCommonVersion.VS2019,
				DotNetVersion = DatabaseDefinitionGenerator.DotNetVersion.Core3,
				Database = database,
				OutputDirectory = directory,
			};
			// Schema - Tables.
			config.Schema.Tables_Included.UnionWith(new String[] { "Language", "Region", "Currency", "TaxCode", "UnitMeasure" });
			config.Schema.Tables_Excluded.UnionWith(new String[] { });
			// Schema - Columns.
			config.Schema.InsertOnlyColumns.Add(".*", "CreateOn,CreateBy,CreateHost");
			config.Schema.InsertOnlyColumns.Add("Language", "");
			config.Schema.InsertOnlyColumns.Add("Region", "Type");
			config.Schema.InsertOnlyColumns.Add("Currency", "");
			config.Schema.InsertOnlyColumns.Add("TaxCode", "");
			config.Schema.InsertOnlyColumns.Add("UnitMeasure", "");
			// Database Definition class.
			config.DefinitionClass.Usings.Clear();
			config.DefinitionClass.Usings.Add("Sarand.Net.Standard.Base.Core");
			config.DefinitionClass.Usings.Add("Sarand.Net.Standard.Base.Utils");
			config.DefinitionClass.Usings.Add("Sarand.Net.Standard.Base.Dbas");
			config.DefinitionClass.Namespace = "Sarand.Net.Standard.Base.ReferenceData";
			config.DefinitionClass.Classname = "SaReferenceDataDbDfn";
			// Table class.
			config.TableClass.Namespace = "Sarand.Net.Standard.Dbas.ReferenceData.Internal";

			// Generate database definition.
			DatabaseDefinitionGenerator generator = new DatabaseDefinitionGenerator();
			return generator.Generate(config);
		}
		//-------------------------------------------------------------------
		private static String GetOutputFolder()
		{
			String fn = className + ".GetOutputFolder";
			String assemblyDirectory = FileUtil.GetParentDirectory((Assembly.GetAssembly(typeof(DatabaseDefinitionGenerator)).Location));
			String directory = assemblyDirectory;
			SaLogger.Debug($"{fn} Assembly folder: {directory}");
			// Locate the parent of the 'Workspace' solution root folder.
			String projectFolder = "Workspace";
			while (!String.IsNullOrEmpty(directory))
			{
				if (FileUtil.IsDirectory(Path.Combine(directory, projectFolder)))
					break;
				directory = FileUtil.GetParentDirectory(directory);
			}
			if (String.IsNullOrEmpty(directory))
			{
				SaLogger.Error($"{fn} Failed to find '{projectFolder}' solution root folder in assembly path: {assemblyDirectory}");
				return String.Empty;
			}
			// Code files are generated to '..\Dbas\Generated\ReferenceData\' folder.
			directory = Path.Combine(directory, "Database", "Generated", "ReferenceData");
			SaLogger.Debug($"{fn} Output folder: {directory}");
			if (!FileUtil.ValidateDirectory(directory, true))
			{
				SaLogger.Error($"{fn} Output folder not found: {directory}");
				return String.Empty;
			}
			return directory;
		}

		//-------------------------------------------------------------------
	}
	//=======================================================================
}