using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Time.Testing;

namespace Calls.Api.Tests;

/// <summary>Комнаты, гостевые ссылки, одноразовые коды и пропуски Jitsi — на временной базе.</summary>
public sealed class StoreTests : IDisposable
{
    public const string Secret = "test-jwt-secret-0123456789abcdef0123456789";
    private readonly string _dir = Path.Combine(Path.GetTempPath(), "calls-test-" + Guid.NewGuid().ToString("N"));
    private readonly FakeTimeProvider _time = new(DateTimeOffset.Parse("2026-10-14T12:00:00Z"));
    private readonly Store _store;
    private static readonly CrmUser Anna = new("uid-anna", "anna@test", "Анна", 0);
    private static readonly CrmUser Bob = new("uid-bob", "bob@test", null, 0);

    public StoreTests()
    {
        var cfg = new ConfigurationBuilder().AddInMemoryCollection(new Dictionary<string, string?>
        {
            ["Storage:DataDir"] = _dir,
            ["Jitsi:AppSecret"] = Secret,
            ["Jitsi:Domain"] = "meet.test",
            ["Calls:LinkSecret"] = "test-link-secret-0123456789abcdef0123456789",
        }).Build();
        var db = new Db(cfg);
        db.Init();
        _store = new Store(db, new JitsiToken(cfg), cfg, _time);
    }

    public void Dispose()
    {
        Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
        try { Directory.Delete(_dir, true); } catch { /* временная папка */ }
    }

    [Fact]
    public void Room_IsStablePerWorkspace_RandomAndWithoutWorkspaceId()
    {
        var a1 = _store.Room("wsmv5l7d425re160", Anna.Id);
        var a2 = _store.Room("wsmv5l7d425re160", Bob.Id);
        var b = _store.Room("shared", Anna.Id);
        Assert.Equal(a1, a2);
        Assert.NotEqual(a1, b);
        Assert.Matches("^ws-[a-z0-9]{20}$", a1);
        Assert.DoesNotContain("mv5l7d425re160", a1);
    }

    [Fact]
    public void JoinCode_IsOneTime()
    {
        var (code, ttl) = _store.CreateJoinCode("shared", Anna);
        Assert.Equal(60, ttl);
        var s = _store.ExchangeCode(code);
        Assert.NotNull(s);
        Assert.Equal("member", s.Kind);
        Assert.Equal("Анна", s.Name);
        Assert.Null(_store.ExchangeCode(code));
    }

    [Fact]
    public void JoinCode_ExpiresAfter60Seconds()
    {
        var (code, _) = _store.CreateJoinCode("shared", Anna);
        _time.Advance(TimeSpan.FromSeconds(61));
        Assert.Null(_store.ExchangeCode(code));
    }

    [Fact]
    public void Pass_ForMember_IsModerator_ForOneRoom_15Minutes_SignedHs256()
    {
        var (code, _) = _store.CreateJoinCode("shared", Anna);
        var s = _store.ExchangeCode(code)!;
        var p = _store.IssuePass(s.Token)!;
        Assert.Equal(_store.Room("shared", Anna.Id), p.Room);
        Assert.Equal("meet.test", p.Domain);
        var claims = VerifyHs256(p.Jwt);
        Assert.Equal("tvorymo-crm", claims.GetProperty("iss").GetString());
        Assert.Equal("jitsi", claims.GetProperty("aud").GetString());
        Assert.Equal(p.Room, claims.GetProperty("room").GetString());
        Assert.Equal(_time.GetUtcNow().AddMinutes(15).ToUnixTimeSeconds(), claims.GetProperty("exp").GetInt64());
        var user = claims.GetProperty("context").GetProperty("user");
        Assert.True(user.GetProperty("moderator").GetBoolean());
        Assert.Equal("Анна", user.GetProperty("name").GetString());
        Assert.Equal("anna@test", user.GetProperty("email").GetString());
        Assert.Equal(Anna.Id, user.GetProperty("id").GetString());
    }

    [Fact]
    public void Session_GivesFreshPassLater_UntilSessionExpires()
    {
        var (code, _) = _store.CreateJoinCode("shared", Anna);
        var s = _store.ExchangeCode(code)!;
        _time.Advance(TimeSpan.FromMinutes(40));     // первый пропуск давно истёк — окно берёт новый
        var p = _store.IssuePass(s.Token)!;
        Assert.Equal(_time.GetUtcNow().AddMinutes(15).ToUnixTimeSeconds(), p.Exp);
        _time.Advance(TimeSpan.FromHours(12));
        Assert.Null(_store.IssuePass(s.Token));
    }

    [Fact]
    public void GuestLink_IsPersistent_GuestIsNotModerator()
    {
        var l1 = _store.GetGuestLink("shared", Anna);
        var l2 = _store.GetGuestLink("shared", Bob);
        Assert.Equal(l1.Token, l2.Token);
        var g = _store.JoinAsGuest(l1.Token, "Гість Іван")!;
        Assert.Equal("guest", g.Kind);
        var p = _store.IssuePass(g.Token)!;
        Assert.Equal(_store.Room("shared", Anna.Id), p.Room);
        var user = VerifyHs256(p.Jwt).GetProperty("context").GetProperty("user");
        Assert.False(user.GetProperty("moderator").GetBoolean());
        Assert.Equal("Гість Іван", user.GetProperty("name").GetString());
    }

    [Fact]
    public void GuestLink_Regenerate_OldStopsWorking_NewWorks_RecordsWho()
    {
        var old = _store.GetGuestLink("shared", Anna);
        var fresh = _store.RegenerateGuestLink("shared", Bob);
        Assert.NotEqual(old.Token, fresh.Token);
        Assert.Null(_store.JoinAsGuest(old.Token, "Гість"));
        Assert.NotNull(_store.JoinAsGuest(fresh.Token, "Гість"));
        Assert.Equal("uid-bob", fresh.UpdatedBy);
        Assert.Equal("bob@test", fresh.UpdatedByName); // имени нет — email
    }

    [Fact]
    public void GuestLink_OfOtherWorkspace_LeadsToItsOwnRoom()
    {
        var a = _store.GetGuestLink("shared", Anna);
        var b = _store.GetGuestLink("wsother000000", Anna);
        var pa = _store.IssuePass(_store.JoinAsGuest(a.Token, "x")!.Token)!;
        var pb = _store.IssuePass(_store.JoinAsGuest(b.Token, "x")!.Token)!;
        Assert.NotEqual(pa.Room, pb.Room);
    }

    [Theory]
    [InlineData("", null)]
    [InlineData("   ", null)]
    [InlineData("  Іван  Петренко ", "Іван Петренко")]
    [InlineData("a\u0000b", "ab")]
    public void GuestName_IsCleaned(string input, string? expected) => Assert.Equal(expected, Store.CleanGuestName(input));

    [Fact]
    public void GuestName_IsCutTo60() => Assert.Equal(60, Store.CleanGuestName(new string('я', 100))!.Length);

    [Fact]
    public void Garbage_TokensAreRejected()
    {
        Assert.Null(_store.ExchangeCode("x"));
        Assert.Null(_store.IssuePass("'; DROP TABLE call_sessions; --"));
        Assert.Null(_store.FindGuestLink(new string('a', 43)));
    }

    public static JsonElement VerifyHs256(string jwt)
    {
        var parts = jwt.Split('.');
        Assert.Equal(3, parts.Length);
        var header = JsonDocument.Parse(B64(parts[0])).RootElement;
        Assert.Equal("HS256", header.GetProperty("alg").GetString());
        var sig = HMACSHA256.HashData(Encoding.UTF8.GetBytes(Secret), Encoding.ASCII.GetBytes(parts[0] + "." + parts[1]));
        Assert.Equal(JitsiToken.B64(sig), parts[2]);
        return JsonDocument.Parse(B64(parts[1])).RootElement;
    }

    private static byte[] B64(string s)
    {
        s = s.Replace('-', '+').Replace('_', '/');
        return Convert.FromBase64String(s.PadRight(s.Length + (4 - s.Length % 4) % 4, '='));
    }
}