using AcDream.Runtime.Chat;

namespace AcDream.Runtime.Tests.Chat;

/// <summary>
/// Campaign CT slice B2: retail expands a typed reply abbreviation the moment
/// the space lands, so the player can see who they are replying to.
/// </summary>
public sealed class ChatTextReplacementsTests
{
    private const string LastTeller = "Dww";

    [Theory]
    // Recovered from the constant pool: data_7C4C70 "r ", data_7C4C68 "rp ",
    // data_7C4C58 "reply " — and SetReplyTextInChatBox accepts either command
    // prefix, testing the first character against '/' (0x2F) or '@' (0x40).
    [InlineData("/r ")]
    [InlineData("/rp ")]
    [InlineData("/reply ")]
    [InlineData("@r ")]
    [InlineData("@rp ")]
    [InlineData("@reply ")]
    [InlineData("/R ")]
    public void AReplyAbbreviationExpandsToATellAtTheLastTeller(string typed)
        => Assert.Equal("@tell Dww, ", ChatTextReplacements.Expand(typed, LastTeller));

    [Fact]
    public void TheExpansionEndsInASpaceSoTypingContinuesCleanly()
    {
        // Without it the first character the player types joins the comma.
        string expanded = ChatTextReplacements.Expand("/r ", LastTeller)!;
        Assert.EndsWith(", ", expanded);
    }

    [Theory]
    // Still being typed — "/r" could yet become "/roleplay", so expanding
    // before the space would hijack a different command mid-word.
    [InlineData("/r")]
    [InlineData("/rep")]
    // A longer verb that merely STARTS with a reply verb.
    [InlineData("/roleplay ")]
    [InlineData("/rt ")]
    // Already has a message: the trigger is the abbreviation ALONE.
    [InlineData("/r hello ")]
    // Not a command at all.
    [InlineData("r ")]
    [InlineData("hello ")]
    [InlineData("")]
    public void AnythingElseIsLeftAlone(string typed)
        => Assert.Null(ChatTextReplacements.Expand(typed, LastTeller));

    [Fact]
    public void WithNobodyToReplyToNothingIsRewritten()
    {
        // Retail performs no expansion rather than producing a tell addressed
        // to nobody; the ordinary submit path is what says
        // "Someone must @tell you first!".
        Assert.Null(ChatTextReplacements.Expand("/r ", lastTeller: null));
        Assert.Null(ChatTextReplacements.Expand("/r ", lastTeller: string.Empty));
    }

    [Fact]
    public void ANameWithSpacesIsPreserved()
    {
        // AC names can be multiple words, and retail's own tell syntax needs
        // the comma precisely because of that.
        Assert.Equal(
            "@tell Aunt Agatha, ",
            ChatTextReplacements.Expand("/r ", "Aunt Agatha"));
    }
}