using System.Text.Json;

using AIStudio.Chat;
using AIStudio.Settings.DataModel;
using AIStudio.Tools;

namespace AIStudio.Tests.Chat;

/// <summary>
/// Checks how the internal content a chat holds restricts where it may still send data.
/// </summary>
/// <remarks>
/// Once internal content is in a chat, mails or pages of the wiki or the intranet, every tool which
/// runs afterwards could carry it out. The chat therefore keeps the strictest restriction of every
/// source it read from, and it keeps it beyond a restart, because the content stays in the chat as
/// well.
/// </remarks>
[TestFixture]
public sealed class ChatThreadOutboundDataRestrictionTests
{
    private const string PRIVATE_MAILBOX_ID = "5c9e2a7b-3f1d-4e8a-b6c4-2d7f9a1e3b5c";
    private const string WORK_MAILBOX_ID = "8d1f4b6a-2e9c-4a7d-9b3e-6c5a8f2d1e4b";
    private const string INTRANET_HOST = "intranet.example.org";

    [Test]
    public void AChatWhichReadNoMailboxDemandsNothing() =>
        Assert.That(new ChatThread().RequiredOutboundDataRestriction, Is.EqualTo(OutboundDataRequirement.NONE));

    [TestCase(OutboundDataRestriction.UNRESTRICTED, OutboundDataRestriction.ONLY_LINKS_FROM_CHAT)]
    [TestCase(OutboundDataRestriction.UNRESTRICTED, OutboundDataRestriction.ONLY_CONFIGURED_SERVICES)]
    [TestCase(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataRestriction.ONLY_CONFIGURED_SERVICES)]
    public void AStricterMailboxTightensTheChat(OutboundDataRestriction held, OutboundDataRestriction arriving)
    {
        var thread = new ChatThread();
        thread.RequireOutboundDataRestriction(new(held, OutboundDataOrigin.MAILBOX, PRIVATE_MAILBOX_ID));
        thread.RequireOutboundDataRestriction(new(arriving, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID));

        Assert.That(thread.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(arriving, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID)), "The stricter mailbox is the one which keeps a tool from running, so it is the one to name.");
    }

    [TestCase(OutboundDataRestriction.ONLY_CONFIGURED_SERVICES, OutboundDataRestriction.ONLY_LINKS_FROM_CHAT)]
    [TestCase(OutboundDataRestriction.ONLY_CONFIGURED_SERVICES, OutboundDataRestriction.UNRESTRICTED)]
    [TestCase(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataRestriction.UNRESTRICTED)]
    public void ARestrictionStays(OutboundDataRestriction held, OutboundDataRestriction arriving)
    {
        var thread = new ChatThread();
        thread.RequireOutboundDataRestriction(new(held, OutboundDataOrigin.MAILBOX, PRIVATE_MAILBOX_ID));
        thread.RequireOutboundDataRestriction(new(arriving, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID));

        Assert.That(thread.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(held, OutboundDataOrigin.MAILBOX, PRIVATE_MAILBOX_ID)), "The mail content was read by this chat. A more permissive mailbox read later cannot undo that.");
    }

    [Test]
    public void OnATieTheMailboxReadFirstStaysNamed()
    {
        var thread = new ChatThread();
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.MAILBOX, PRIVATE_MAILBOX_ID));
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID));

        Assert.That(thread.RequiredOutboundDataRestriction.Reference, Is.EqualTo(PRIVATE_MAILBOX_ID), "Otherwise the chat would name another mailbox with every search.");
    }

    [Test]
    public void AStricterSourceOfAnotherKindTightensTheChat()
    {
        var thread = new ChatThread();
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID));
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_CONFIGURED_SERVICES, OutboundDataOrigin.INTERNAL_WEB_PAGE, INTRANET_HOST));

        Assert.That(thread.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(OutboundDataRestriction.ONLY_CONFIGURED_SERVICES, OutboundDataOrigin.INTERNAL_WEB_PAGE, INTRANET_HOST)), "The level decides, not the kind of source, and the stricter source is the one to name.");
    }

    [Test]
    public void OnATieTheSourceReadFirstStaysNamedWhateverItsKind()
    {
        var thread = new ChatThread();
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.CONFLUENCE_WIKI, string.Empty));
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID));
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.INTERNAL_WEB_PAGE, INTRANET_HOST));

        Assert.That(thread.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.CONFLUENCE_WIKI, string.Empty)));
    }

    [Test]
    public void ResultsWhichDemandNothingChangeNothing()
    {
        var thread = new ChatThread();
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_CONFIGURED_SERVICES, OutboundDataOrigin.MAILBOX, PRIVATE_MAILBOX_ID));
        thread.RequireOutboundDataRestriction(OutboundDataRequirement.NONE);

        Assert.That(thread.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(OutboundDataRestriction.ONLY_CONFIGURED_SERVICES, OutboundDataOrigin.MAILBOX, PRIVATE_MAILBOX_ID)), "A search of the local files, say, says nothing about mailboxes and must leave the chat as it was.");
    }

    [Test]
    public void TheRestrictionSurvivesSavingTheChat()
    {
        var thread = new ChatThread { ChatId = Guid.NewGuid() };
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID));

        var loaded = JsonSerializer.Deserialize<ChatThread>(JsonSerializer.Serialize(thread, WorkspaceBehaviour.JSON_OPTIONS), WorkspaceBehaviour.JSON_OPTIONS);

        Assert.That(loaded?.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, OutboundDataOrigin.MAILBOX, WORK_MAILBOX_ID)), "After a restart, the mail content is still in the chat, so the restriction has to be as well.");
    }

    [TestCase(OutboundDataOrigin.CONFLUENCE_WIKI, "")]
    [TestCase(OutboundDataOrigin.INTERNAL_WEB_PAGE, INTRANET_HOST)]
    public void TheOriginSurvivesSavingTheChat(OutboundDataOrigin origin, string reference)
    {
        var thread = new ChatThread { ChatId = Guid.NewGuid() };
        thread.RequireOutboundDataRestriction(new(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, origin, reference));

        var loaded = JsonSerializer.Deserialize<ChatThread>(JsonSerializer.Serialize(thread, WorkspaceBehaviour.JSON_OPTIONS), WorkspaceBehaviour.JSON_OPTIONS);

        Assert.That(loaded?.RequiredOutboundDataRestriction, Is.EqualTo(new OutboundDataRequirement(OutboundDataRestriction.ONLY_LINKS_FROM_CHAT, origin, reference)), "Otherwise a restored chat would name a mailbox for content it read from elsewhere.");
    }

    [Test]
    public void AChatSavedBeforeMailboxesExistedDemandsNothing()
    {
        const string CHAT_WITHOUT_RESTRICTION = """
                                                {
                                                  "chat_id": "2b7c9e1f-4a6d-4c8b-9e3f-1d5a7c9b2e4f",
                                                  "name": "An older chat",
                                                  "blocks": []
                                                }
                                                """;

        var loaded = JsonSerializer.Deserialize<ChatThread>(CHAT_WITHOUT_RESTRICTION, WorkspaceBehaviour.JSON_OPTIONS);

        Assert.That(loaded?.RequiredOutboundDataRestriction, Is.EqualTo(OutboundDataRequirement.NONE));
    }
}