using Microsoft.Extensions.Configuration;
using Sarand.Net.Standard.Base.Core;
using Saxonite.Net.Standard.Base.App;
using Saxonite.Net.Core.Web.Base.App;
using System;
using System.Collections.Generic;
using System.Text;
using Sarand.Net.Standard.Base.Utils;

namespace Saxonite.Net.Core.Web.Base.Helpers
{
	//=======================================================================
	public static class SaxAppConfigHelper
	{
		//-------------------------------------------------------------------
		public static Dictionary<String, SaxAppConfig> ExtractAppConfigs(IConfigurationSection appConfigsSection)
		{
			// NB The set of configurations will only allow one per context.
			// Only the last configuration found for each context will be stored (NB usually only one of each apart from 'Defaults').
			Dictionary<String, SaxAppConfig> appConfigs = new Dictionary<String, SaxAppConfig>();

			// Start the list with a default 'Defaults' configuration - values set to application defaults (defined in Sax).
			// NB This can be overridden in each level of configuration.
			// Settings from the 'Defaults' configuration provide values where they are missing from other configurations.
			// NB Coverage may not be 100% - just where it's proven needed.
			SaxAppConfig defaultsAppConfig = new SaxAppConfig(Sax.Config.Context_Defaults, null, null);
			appConfigs.Add(defaultsAppConfig.Context, defaultsAppConfig);

			// Load session configurations.
			foreach (ConfigurationSection appConfigSection in appConfigsSection.GetChildren())
			{
				if (StringUtil.IsEmpty(appConfigSection.Key)) continue;

				// Extract the configuration, supplying current 'Defaults' to supply missing values, and add to the list.
				SaxAppConfig appConfig = new SaxAppConfig(appConfigSection.Key, appConfigSection, defaultsAppConfig);
				appConfigs.Remove(appConfigSection.Key);
				appConfigs.Add(appConfigSection.Key, appConfig);

				// Replace the 'Defaults' configuration if this one matches the context.
				if (appConfig.Context.EqualsCI(Sax.Config.Context_Defaults))
					defaultsAppConfig = appConfig;
			}
			return appConfigs;
		}

		//-------------------------------------------------------------------
	}

	//=======================================================================
	public static class AppConfigList
	{
		public static SaxAppConfig getConfigForApplication(this List<SaxAppConfig> appConfigs)
		{
			SaxAppConfig defaultsAppConfig = new SaxAppConfig("", null, null);
			SaxApplication_Base app = SaxGlobals.App;
			if (app != null)
			{
				foreach (SaxAppConfig appConfig in appConfigs)
				{
					if (appConfig.Environments.ContainsCI(app.EnvironmentName))
						return appConfig;
					if (appConfig.Context.EqualsCI(Sax.Config.Context_Defaults))
						defaultsAppConfig = appConfig;
				}
			}
			return defaultsAppConfig;
		}
	}

	//=======================================================================
}