using Microsoft.Extensions.Logging;
using Sarand.Net.Standard.Dbas.Base;
using Sarand.Net.Standard.Base.Core;
using Sarand.Net.Standard.Base.IO;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using Sarand.Net.Standard.Base.App;
using Sarand.Net.Standard.Base.Utils;
using Saxonite.Net.Standard.Base.App;

namespace Saxonite.Net.Standard.Dbas.App
{
	//=======================================================================
	public static class SaxDbDfnGenerator
	{
		//-------------------------------------------------------------------
		// Data members.

		//-------------------------------------------------------------------
		/// <summary>
		/// Generate database definitions.
		/// </summary>
		public static bool Generate(Sax.Database dbInstance, String connectionString)
		{
			String fn = nameof(SaxDbDfnGenerator) + ".Generate";

			// Locate output folder:
			String directory = GetOutputFolder(dbInstance);
			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(dbInstance, database, directory);
			}
			catch (Exception exc)
			{
				SaLogger.Error(fn + " " + ExceptionUtil.GetErrorStateMessage(exc));
			}
			return false;
		}

		//-------------------------------------------------------------------
		private static bool GenerateDatabaseDefinition(Sax.Database dbInstance, 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_Excluded.UnionWith(new String[] { });
			// Schema - Columns.
			config.Schema.InsertOnlyColumns.Add(".*", "CreateOn,CreateBy,CreateHost");
			config.Schema.InsertOnlyColumns.Add("SomeOldTable", "Code");
			// Database definition class.
			config.DefinitionClass.Usings.Add("Sarand.Net.Standard.Base.Core");
			config.DefinitionClass.Usings.Add("Sarand.Net.Standard.Base.Dbas");
			config.DefinitionClass.Usings.Add("Sarand.Net.Standard.Base.Utils");
			config.DefinitionClass.Namespace = "Saxonite.Base.App";
			config.DefinitionClass.Classname = "SaxDbDfn_" + dbInstance.ToString();
			// Table class.
			config.TableClass.Usings.Add("Sarand.Net.Standard.Base.App");
			config.TableClass.Usings.Add("Sarand.Net.Standard.Base.Core");
			config.TableClass.Usings.Add("Sarand.Net.Standard.Base.Dbas");
			config.TableClass.Usings.Add("Sarand.Net.Standard.Base.Utils");
			config.TableClass.Namespace_BaseClass = "Saxonite.Net.Standard.Dbas.Data";
			config.TableClass.Namespace = "Saxonite.Net.Standard.Dbas.Internal." + dbInstance.ToString();
			config.TableClass.BaseClass = "SaxDbDataItem";
			config.TableClass.ClassName_DatabaseInfo = "IDatabaseInfo";
			config.TableClass.MandatoryConstructorDbInfo = true;

			// Generate database definition.
			DatabaseDefinitionGenerator generator = new DatabaseDefinitionGenerator();
			return generator.Generate(config);
		}

		//-------------------------------------------------------------------
		private static String GetOutputFolder(Sax.Database dbInstance)
		{
			String fn = nameof(SaxDbDfnGenerator) + ".GetOutputFolder";
			var assembly = Assembly.GetAssembly(typeof(DatabaseDefinitionGenerator));
			var assemblyLocation = assembly.Location;
			String assemblyDirectory = FileUtil.GetParentDirectory(assemblyLocation);
			String directory = assemblyDirectory;
			SaLogger.Debug(fn + " Assembly folder: " + directory);
			// Locate the parent of the 'Workspace' solution root folder.
			String projectFolder = "Database";
			while (!String.IsNullOrEmpty(directory))
			{
				if (FileUtil.IsDirectory(directory + Path.DirectorySeparatorChar + projectFolder))
				{
					break;
				}
				directory = FileUtil.GetParentDirectory(directory);
			}
			if (String.IsNullOrEmpty(directory))
			{
				SaLogger.Error(fn + " Failed to find '" + projectFolder + "' solution root folder in assembly path:\n\t" + assemblyDirectory);
				return String.Empty;
			}
			// Code files are generated to '..\Dbas\Generated\Saxonite-[Instance]\' folder.
			directory += Path.DirectorySeparatorChar + "Database" + Path.DirectorySeparatorChar + "Generated" + Path.DirectorySeparatorChar + "Saxonite-" + dbInstance.ToString();
			SaLogger.Debug(fn + " Output folder: " + directory);
			if (!FileUtil.ValidateDirectory(directory, true))
			{
				SaLogger.Error(fn + " Output folder not found:\n\n" + directory);
				return String.Empty;
			}
			return directory;
		}

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