using System.Collections.Immutable;
using System.Text.Json.Nodes;
using Connected.Net;
using Connected.ServiceModel.Client.Net;
using Connected.ServiceModel.Client.Subscription;

namespace Connected.ServiceModel.Client.Data.Remote;

internal sealed class RemoteTableService
{
	//TODO:load it from config or environment.
	private const string AccessToken = "Temp";
	public RemoteTableService(IHttpService http, IConnectedServer server, ISubscriptionService subscription)
	{
		Http = http;
		Server = server;
		Subscription = subscription;
	}

	private IHttpService Http { get; }
	private IConnectedServer Server { get; }
	private ISubscriptionService Subscription { get; }
	private int SubscriptionId { get; set; }

	public async Task<JsonArray> Query(string commandText)
	{
		await Initialize();

		var url = await Server.SelectUrl(new ConnectedServerUrlArgs { Kind = ConnectedUrlKind.TableStorage });

		if (await Http.Post<JsonArray>($"{url}/query", new QueryTableArgs
		{
			CommandText = commandText,
			AccessToken = AccessToken,
			Subscription = SubscriptionId
		}) is not JsonArray result)
			return new JsonArray();

		return result;
	}

	public async Task<ImmutableList<RemoteTableColumn>> QueryColumns(string tableName)
	{
		await Initialize();

		var url = await Server.SelectUrl(new ConnectedServerUrlArgs { Kind = ConnectedUrlKind.TableStorage });

		if (await Http.Post<List<RemoteTableColumn>>($"{url}/queryColumns", new TableSchemaArgs
		{
			TableName = tableName,
			AccessToken = AccessToken,
			Subscription = SubscriptionId
		}) is not List<RemoteTableColumn> result)
			return ImmutableList<RemoteTableColumn>.Empty;

		return result.ToImmutableList();
	}

	public async Task<bool> TableExists(string tableName)
	{
		await Initialize();

		var url = await Server.SelectUrl(new ConnectedServerUrlArgs { Kind = ConnectedUrlKind.TableStorage });

		return await Http.Post<bool>($"{url}/tableExists", new TableSchemaArgs
		{
			TableName = tableName,
			AccessToken = AccessToken,
			Subscription = SubscriptionId
		});
	}

	public async Task Update(string commandText)
	{
		await Initialize();

		var url = await Server.SelectUrl(new ConnectedServerUrlArgs { Kind = ConnectedUrlKind.TableStorage });

		await Http.Post($"{url}/update", new UpdateTableArgs
		{
			CommandText = commandText,
			AccessToken = AccessToken,
			Subscription = SubscriptionId
		});
	}

	public async Task CreateTable(string tableName, List<RemoteTableColumn> columns)
	{
		await Initialize();

		var url = await Server.SelectUrl(new ConnectedServerUrlArgs { Kind = ConnectedUrlKind.TableStorage });

		await Http.Post($"{url}/createTable", new CreateTableArgs
		{
			Name = tableName,
			Columns = columns,
			AccessToken = AccessToken,
			Subscription = SubscriptionId
		});
	}

	private async Task Initialize()
	{
		if (SubscriptionId > 0)
			return;

		if (await Subscription.Select() is not ISubscription subscription)
			throw new NullReferenceException(nameof(ISubscription));

		SubscriptionId = subscription.Id;
	}
}