using System.Reflection;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.API;
using RadicadeServer.DB;
using RadicadeServer.RecNet.Auth;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// The role lookup the client uses to decide whether to show developer-only content.
///
/// The 2023 client builds this URL from a literal of the form <c>role/{0}/{1}</c> and resolves
/// it against its RecNet base, and the reference implementation serves it at the host root
/// (<c>GET /role/developer/:id</c>). This server mounted it only under <c>auth/role/</c>, so on a
/// client whose base does not end in <c>auth/</c> the lookup 404s - measured against the live
/// server: <c>/role/developer/6</c> answered 404 while <c>/auth/role/developer/6</c> answered 200.
/// A 404 here does not error visibly; it just silently reports "not a developer", which hides
/// everything the role gates.
///
/// This is the same class of bug the equipment backpack hit - a correct handler behind a missing
/// prefix - which is why the route assertions are the point of this file.
/// </summary>
[Collection(DbFactoryCollection.Name)]
public class RoleLookupTests
{
    private static RecDBContext NewDb() => new(
        TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options);

    private static async Task<RecDBContext> WithProfile(long accountId, string? roles)
    {
        var db = NewDb();
        db.Profiles.Add(new Profile
        {
            accountId = accountId,
            role = roles,
            username = $"player{accountId}",
            displayName = $"Player {accountId}",
            profileImage = DBConfig.DefaultProfileImage
        });
        await db.SaveChangesAsync();
        return db;
    }

    /// <summary>Every route the client can reach this lookup on: prefix + "{roleType}/{id}".</summary>
    private static string[] Routes()
    {
        var method = typeof(RolesAPI).GetMethod(nameof(RolesAPI.GetDeveloperRole))!;
        var templates = method.GetCustomAttributes<HttpGetAttribute>().Select(a => a.Template).ToArray();

        return typeof(RolesAPI).GetCustomAttributes<RouteAttribute>()
            .SelectMany(prefix => templates.Select(suffix => $"{prefix.Template}/{suffix}"))
            .ToArray();
    }

    [Fact]
    public void TheRoleLookupAnswersAtTheRootPathTheClientBuilds()
    {
        var routes = Routes();

        // What the client's literal resolves to when its base is the host root, and what the
        // reference implementation serves.
        Assert.Contains("role/{roleType}/{id}", routes);

        // The path this server already had, kept so nothing that works today starts 404ing.
        Assert.Contains("auth/role/{roleType}/{id}", routes);
    }

    [Theory]
    [InlineData("developer")]
    [InlineData("moderator")]
    public void BothWalkedRolesReachTheLookup(string roleType)
    {
        var routes = Routes().Select(route => route.Replace("{roleType}", roleType)).ToArray();

        Assert.Contains($"role/{roleType}/{{id}}", routes);
        Assert.Contains($"auth/role/{roleType}/{{id}}", routes);
    }

    [Fact]
    public async Task TheLookupReportsTheProfilesRoles()
    {
        using var db = await WithProfile(6, "developer,moderator");
        var api = new RolesAPI(db);

        Assert.True(await api.GetDeveloperRole("developer", 6));
        Assert.True(await api.GetDeveloperRole("moderator", 6));
    }

    [Fact]
    public async Task ARoleTheProfileDoesNotHoldIsFalse()
    {
        using var db = await WithProfile(6, "developer");
        var api = new RolesAPI(db);

        // The client reads a bare boolean, so a role that is not held has to answer false
        // rather than error - it is a gate, not a lookup that can fail.
        Assert.False(await api.GetDeveloperRole("moderator", 6));
    }

    [Fact]
    public async Task AnUnknownOrRolelessAccountIsNotADeveloper()
    {
        using var roleless = await WithProfile(1, null);
        Assert.False(await new RolesAPI(roleless).GetDeveloperRole("developer", 1));

        using var db = NewDb();
        Assert.False(await new RolesAPI(db).GetDeveloperRole("developer", 99999));
    }

    [Fact]
    public async Task RolesAreMatchedCaseInsensitivelyAndTrimmed()
    {
        // The admin panel writes whatever the operator picked, joined with commas.
        using var db = await WithProfile(6, " Developer , Moderator ");
        var api = new RolesAPI(db);

        Assert.True(await api.GetDeveloperRole("developer", 6));
        Assert.True(await api.GetDeveloperRole("moderator", 6));
    }

    [Fact]
    public async Task GrantingTheDeveloperRoleFlipsTheLookup()
    {
        using var db = await WithProfile(6, null);
        var api = new RolesAPI(db);

        Assert.False(await api.GetDeveloperRole("developer", 6));

        var profile = await db.Profiles.FirstAsync(x => x.accountId == 6);
        profile.role = "developer";
        await db.SaveChangesAsync();

        Assert.True(await api.GetDeveloperRole("developer", 6));
    }
}