using System.Net;
using System.Security.Claims;
using System.Security.Cryptography;
using System.Text.Json;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using SQLInsight.Core.Configuration;
using SQLInsight.Repository;
using SQLInsight.Web;
using SQLInsight.Web.Api;

namespace SQLInsight.IntegrationTests;

/// <summary>Servere og databaser in SQLInsight Web: adding, testing, choosing databases, the GRANT script and passwords.</summary>
[Collection(SqlServerTestGroup.Name)]
[Trait("Category", "Integration")]
public sealed partial class InstanceSetupWebTests(SqlServerFixture sql) : IAsyncLifetime
{
    private const string Password = "Hemmelig-Kode-1!";
    private readonly string _database = "SQLInsightSetup_" + Guid.NewGuid().ToString("N")[..8];
    private readonly RSA _agentKey = RSA.Create(3072);
    private WebApplicationFactory<Program> _factory = null!;
    private InsightRepository _repository = null!;

    [GeneratedRegex("name=\"__RequestVerificationToken\"[^>]*value=\"([^\"]+)\"")]
    private static partial Regex AntiforgeryField();

    public async Task InitializeAsync()
    {
        await sql.ExecuteAsSaAsync($"CREATE DATABASE [{_database}];");
        _repository = new InsightRepository(sql.DatabaseConnectionString(_database));
        await _repository.MigrateAsync();
        _factory = new WebApplicationFactory<Program>().WithWebHostBuilder(b =>
        {
            b.UseEnvironment("Development");
            b.UseSetting("SQLInsight:Repository:ConnectionString", sql.DatabaseConnectionString(_database));
            b.UseSetting("SQLInsight:Web:Authentication", "None");
        });
    }

    public async Task DisposeAsync()
    {
        _agentKey.Dispose();
        await _factory.DisposeAsync();
        await sql.ExecuteAsSaAsync($"ALTER DATABASE [{_database}] SET SINGLE_USER WITH ROLLBACK IMMEDIATE; DROP DATABASE [{_database}];");
    }

    private Task PublishAgentKeyAsync() => _repository.PublishAgentKeyAsync(new AgentKeyRow
    {
        KeyId = "agent-test", PublicKey = _agentKey.ExportSubjectPublicKeyInfo(), MachineName = "AGENT01", ServiceAccount = @"NT SERVICE\SQLInsight Agent",
        Domain = "FIRMA", CreatedAt = DateTime.UtcNow, LastSeenAt = DateTime.UtcNow,
    });

    private HttpClient Client() => _factory.CreateClient(new WebApplicationFactoryClientOptions { AllowAutoRedirect = false });

    /// <summary>Posts a form the way the browser does: with the antiforgery token from <paramref name="page"/>.</summary>
    private static async Task<HttpResponseMessage> PostAsync(HttpClient client, string page, string action, Dictionary<string, string> fields, params (string Name, string Value)[] repeated)
    {
        var html = await client.GetStringAsync(page);
        var values = new List<KeyValuePair<string, string>> { new("__RequestVerificationToken", WebUtility.HtmlDecode(AntiforgeryField().Match(html).Groups[1].Value)) };
        values.AddRange(fields);
        values.AddRange(repeated.Select(r => new KeyValuePair<string, string>(r.Name, r.Value)));
        using var content = new FormUrlEncodedContent(values);
        return await client.PostAsync(action, content);
    }

    private static int IdFrom(HttpResponseMessage response) =>
        int.Parse(Regex.Match(response.Headers.Location!.OriginalString, @"/opsaetning/instanser/(\d+)").Groups[1].Value, System.Globalization.CultureInfo.InvariantCulture);

    [Fact]
    public async Task Overview_marks_paused_servers_and_leaves_out_removed_ones_and_so_do_the_alerts()
    {
        var now = DateTimeOffset.UtcNow;
        var paused = await _repository.AddConfiguredInstanceAsync(new NewConfiguredInstance("paused-sql", "sql05", null, "Windows", null, null, null, "Mandatory", false, false), "anna", now);
        var removed = await _repository.AddConfiguredInstanceAsync(new NewConfiguredInstance("removed-sql", "sql06", null, "Windows", null, null, null, "Mandatory", false, false), "anna", now);
        await _repository.RecordInstanceErrorAsync("paused-sql", "kan ikke nås", now);
        await _repository.RecordInstanceErrorAsync("removed-sql", "kan ikke nås", now);
        await _repository.SetInstancePausedAsync(paused, true, "anna", now);
        await _repository.RemoveConfiguredInstanceAsync(removed, "anna", now);

        var home = await Client().GetStringAsync("/");
        var metrics = await Client().GetStringAsync("/metrics");

        Assert.Contains("paused-sql", home, StringComparison.Ordinal);
        Assert.Contains("Sat på pause", home, StringComparison.Ordinal);
        Assert.DoesNotContain("removed-sql", home, StringComparison.Ordinal);
        Assert.Contains("sqlinsight_instance_paused{instance=\"paused-sql\"} 1", metrics, StringComparison.Ordinal);
        Assert.DoesNotContain("sqlinsight_instance_up{instance=\"paused-sql\"}", metrics, StringComparison.Ordinal);
        Assert.DoesNotContain("removed-sql", metrics, StringComparison.Ordinal);

        // The history is still there.
        Assert.Contains("fjernet", await Client().GetStringAsync("/instanser/removed-sql"), StringComparison.Ordinal);
    }

    [Fact]
    public async Task Page_lists_servers_from_the_configuration_file_and_the_web_and_the_menu_links_to_it()
    {
        await _repository.SyncConfigFileInstancesAsync([new ConfigFileInstance("prod-sql01", "sql01", "Windows", null, "Mandatory", false)], DateTimeOffset.UtcNow);
        await _repository.AddConfiguredInstanceAsync(new NewConfiguredInstance("ax-sql", "ax01\\AX30", null, "Windows", null, null, null, "Mandatory", false, false), "anna", DateTimeOffset.UtcNow);

        var page = await Client().GetStringAsync("/opsaetning/instanser");
        var home = await Client().GetStringAsync("/");

        Assert.Contains("prod-sql01", page, StringComparison.Ordinal);
        Assert.Contains("fra konfigurationsfil", page, StringComparison.Ordinal);
        Assert.Contains(@"ax01\AX30", page, StringComparison.Ordinal);
        Assert.Contains("Alle (også nye)", page, StringComparison.Ordinal);
        Assert.Contains("Agenten har ikke meldt sig endnu", page, StringComparison.Ordinal);
        Assert.Contains("href=\"/opsaetning/instanser\"", home, StringComparison.Ordinal);
        Assert.Contains("Servere og databaser", home, StringComparison.Ordinal);
    }

    [Fact]
    public async Task Admin_adds_a_server_and_the_agent_is_asked_to_test_it_and_find_its_databases()
    {
        var client = Client();
        var posted = await PostAsync(client, "/opsaetning/instanser", "/opsaetning/instanser/tilfoej", new()
        {
            ["server"] = @"sql01.firma.local\PROD", ["port"] = "1450", ["authentication"] = "Windows", ["encryption"] = "Mandatory",
        });

        Assert.Equal(HttpStatusCode.Redirect, posted.StatusCode);
        var id = IdFrom(posted);
        var row = (await _repository.GetConfiguredInstanceAsync(id))!;
        Assert.Equal((@"sql01.firma.local\PROD", 1450, "Windows", false), (row.Name, row.Port, row.Authentication, row.MonitorNewDatabases));
        Assert.Equal(AgentRequestStatus.Pending, (await _repository.GetLatestAgentRequestAsync(id, AgentRequestKind.ConnectionTest))!.Status);
        Assert.NotNull(await _repository.GetLatestAgentRequestAsync(id, AgentRequestKind.DatabaseDiscovery));

        var waiting = await client.GetStringAsync($"/opsaetning/instanser/{id}?tilfoejet=1");
        Assert.Contains("Venter på agenten", waiting, StringComparison.Ordinal);
        Assert.Contains("http-equiv=\"refresh\"", waiting, StringComparison.Ordinal);

        // The agent has published who it is: the script is for the computer account it arrives as on another server.
        await PublishAgentKeyAsync();
        var page = await client.GetStringAsync($"/opsaetning/instanser/{id}");
        Assert.Contains(@"SET @LoginName = N&#x27;FIRMA\AGENT01$&#x27;;", page, StringComparison.Ordinal);
        Assert.Contains(@"CREATE LOGIN [FIRMA\AGENT01$] FROM WINDOWS", page, StringComparison.Ordinal);

        var duplicate = await PostAsync(client, "/opsaetning/instanser", "/opsaetning/instanser/tilfoej", new() { ["server"] = @"sql01.firma.local\PROD", ["authentication"] = "Windows" });
        Assert.Contains("bruges allerede", Uri.UnescapeDataString(duplicate.Headers.Location!.OriginalString), StringComparison.Ordinal);
    }

    [Fact]
    public async Task A_sql_login_password_is_sealed_for_the_agent_and_never_shown_again()
    {
        var client = Client();
        var fields = new Dictionary<string, string>
        {
            ["server"] = "sql02", ["authentication"] = "SqlLogin", ["userName"] = "sqlinsight", ["password"] = Password, ["trustServerCertificate"] = "true",
        };

        var withoutAgent = await PostAsync(client, "/opsaetning/instanser", "/opsaetning/instanser/tilfoej", fields);
        Assert.Contains("Agenten har ikke meldt sig endnu", Uri.UnescapeDataString(withoutAgent.Headers.Location!.OriginalString), StringComparison.Ordinal);
        Assert.Empty(await _repository.GetConfiguredInstancesAsync());

        await PublishAgentKeyAsync();
        var id = IdFrom(await PostAsync(client, "/opsaetning/instanser", "/opsaetning/instanser/tilfoej", fields));

        var row = (await _repository.GetConfiguredInstanceAsync(id))!;
        Assert.True(row.HasPassword);
        Assert.Equal(Password, CredentialEnvelope.Open(row.PasswordCipher!, "agent-test", _agentKey, CredentialEnvelope.Context("sql02", "sqlinsight")));
        var page = await client.GetStringAsync($"/opsaetning/instanser/{id}");
        var api = await client.GetStringAsync($"/api/v1/monitored-instances/{id}");
        Assert.DoesNotContain(Password, page, StringComparison.Ordinal);
        Assert.Contains("adgangskode gemt krypteret", page, StringComparison.Ordinal);
        Assert.DoesNotContain(Password, api, StringComparison.Ordinal);
        Assert.DoesNotContain("cipher", api, StringComparison.OrdinalIgnoreCase);
        Assert.True(JsonDocument.Parse(api).RootElement.GetProperty("hasPassword").GetBoolean());

        // Another server without the password again is refused: the password is sealed to sql02.
        var moved = await PostAsync(client, $"/opsaetning/instanser/{id}", $"/opsaetning/instanser/{id}/forbindelse", new()
        {
            ["server"] = "evil01", ["authentication"] = "SqlLogin", ["userName"] = "sqlinsight",
        });
        Assert.Contains("Indtast adgangskoden igen", Uri.UnescapeDataString(moved.Headers.Location!.OriginalString), StringComparison.Ordinal);
        Assert.Equal("sql02", (await _repository.GetConfiguredInstanceAsync(id))!.Server);
    }

    [Fact]
    public async Task Connection_test_shows_the_missing_rights_and_the_script_for_the_login_the_agent_used()
    {
        var id = await _repository.AddConfiguredInstanceAsync(new NewConfiguredInstance("prod", "sql01", null, "Windows", null, null, null, "Mandatory", false, false), null, DateTimeOffset.UtcNow);
        var request = await _repository.AddAgentRequestAsync(AgentRequestKind.ConnectionTest, id, null, "anna", DateTimeOffset.UtcNow);
        await _repository.ClaimAgentRequestAsync(DateTimeOffset.UtcNow);
        await _repository.CompleteAgentRequestAsync(request, true, AgentRequestJson.Serialize(new ConnectionTestResult
        {
            Connected = true, Provider = "SqlClient", ProductVersion = "16.0.4135.4", Release = "SQL Server 2022", Edition = "Standard Edition", ServerName = "SQL01",
            Login = @"FIRMA\AGENT01$", PermissionsChecked = true,
            Permissions =
            [
                new PermissionStatus("VIEW SERVER PERFORMANCE STATE", false, true, "DMV'er"),
                new PermissionStatus("VIEW ANY DEFINITION", true, true, "Metadata"),
                new PermissionStatus("ALTER TRACE", false, false, "Valgfri"),
            ],
        }), null, DateTimeOffset.UtcNow);

        var page = await Client().GetStringAsync($"/opsaetning/instanser/{id}");
        var api = JsonDocument.Parse(await Client().GetStringAsync($"/api/v1/monitored-instances/{id}/connection-test")).RootElement;

        Assert.Contains("Agenten mangler 1 rettighed", page, StringComparison.Ordinal);
        Assert.Contains("VIEW SERVER PERFORMANCE STATE", page, StringComparison.Ordinal);
        Assert.Contains("Valgfri, mangler", page, StringComparison.Ordinal);
        Assert.Contains(@"SET @LoginName = N&#x27;FIRMA\AGENT01$&#x27;;", page, StringComparison.Ordinal);
        Assert.DoesNotContain("http-equiv=\"refresh\"", page, StringComparison.Ordinal);
        Assert.Equal(["VIEW SERVER PERFORMANCE STATE"], api.GetProperty("missingPermissions").EnumerateArray().Select(e => e.GetString()));
        Assert.True(api.GetProperty("request").GetProperty("result").GetProperty("connected").GetBoolean());
    }

    [Fact]
    public async Task Databases_and_ax_findings_to_the_hub_are_chosen_with_the_form()
    {
        var id = await _repository.AddConfiguredInstanceAsync(new NewConfiguredInstance("ax", "ax01", null, "Windows", null, null, null, "Mandatory", false, false), null, DateTimeOffset.UtcNow);
        await _repository.SaveDiscoveredDatabasesAsync(id,
        [
            new DiscoveredDatabase { Name = "master", IsSystem = true, HasAccess = true, State = "ONLINE" },
            new DiscoveredDatabase { Name = "AX30", HasAccess = true, State = "ONLINE", IsDynamicsAx = true, DynamicsAxVersion = "3.0", SizeMb = 20480, RecoveryModel = "FULL", CompatibilityLevel = 90 },
            new DiscoveredDatabase { Name = "Sales", HasAccess = true, State = "ONLINE" },
        ], DateTimeOffset.UtcNow);
        var page = $"/opsaetning/instanser/{id}";

        var html = await Client().GetStringAsync(page);
        Assert.Contains("Ja, AX 3.0", html, StringComparison.Ordinal);
        Assert.Contains("20,0 GB", html, StringComparison.Ordinal);

        var posted = await PostAsync(Client(), page, page + "/databaser", new() { ["monitorNew"] = "true" }, ("monitor", "AX30"), ("ax", "AX30"), ("ax", "Sales"));

        Assert.Equal(HttpStatusCode.Redirect, posted.StatusCode);
        var databases = (await _repository.GetConfiguredDatabasesAsync(id)).ToDictionary(d => d.DatabaseName);
        Assert.Equal((true, true), (databases["AX30"].Monitored, databases["AX30"].SendDynamicsAxToHub));
        Assert.Equal((false, false), (databases["Sales"].Monitored, databases["Sales"].SendDynamicsAxToHub));
        Assert.True((await _repository.GetConfiguredInstanceAsync(id))!.MonitorNewDatabases);
    }

    [Fact]
    public async Task A_configuration_file_server_is_paused_here_but_removed_in_the_file()
    {
        var id = (await _repository.SyncConfigFileInstancesAsync([new ConfigFileInstance("prod-sql01", "sql01", "Windows", null, "Mandatory", false)], DateTimeOffset.UtcNow))["prod-sql01"];
        var page = $"/opsaetning/instanser/{id}";

        var removed = await PostAsync(Client(), page, page + "/fjern", []);
        var paused = await PostAsync(Client(), page, page + "/pause", new() { ["paused"] = "true" });

        Assert.Contains("konfigurationsfil", Uri.UnescapeDataString(removed.Headers.Location!.OriginalString), StringComparison.Ordinal);
        Assert.Equal($"{page}?pause=1", paused.Headers.Location!.OriginalString);
        Assert.True((await _repository.GetConfiguredInstanceAsync(id))!.Paused);
        Assert.DoesNotContain("Fjern serveren", await Client().GetStringAsync(page), StringComparison.Ordinal);
    }

    [Fact]
    public async Task A_form_without_the_antiforgery_token_is_refused()
    {
        using var content = new FormUrlEncodedContent(new Dictionary<string, string> { ["server"] = "sql09" });

        var response = await Client().PostAsync("/opsaetning/instanser/tilfoej", content);

        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
        Assert.Empty(await _repository.GetConfiguredInstancesAsync());
    }

    [Fact]
    public void Only_admin_groups_and_config_write_tokens_may_change_the_configuration()
    {
        var windows = new WebOptions { Authentication = "Windows" };
        windows.AdminGroups.Add(@"FIRMA\SQL-Admins");
        static ClaimsPrincipal User(params Claim[] claims) => new(new ClaimsIdentity(claims, "Negotiate", ClaimTypes.Name, ClaimTypes.Role));

        Assert.True(InstanceSetup.MayChange(User(new Claim(ClaimTypes.Role, @"FIRMA\SQL-Admins")), windows));
        Assert.False(InstanceSetup.MayChange(User(new Claim(ClaimTypes.Role, @"FIRMA\SQL-Readers")), windows));
        Assert.False(InstanceSetup.MayChange(User(new Claim(ClaimTypes.Role, @"FIRMA\SQL-Admins")), new WebOptions { Authentication = "Windows" }));
        Assert.True(InstanceSetup.MayChange(User(), new WebOptions { Authentication = "None" }));
        Assert.True(InstanceSetup.MayChange(User(new Claim(ApiTokenHandler.ClaimType, "itsm"), new Claim(ApiTokenHandler.ScopeClaimType, ApiToken.ConfigWrite)), windows));
        Assert.False(InstanceSetup.MayChange(User(new Claim(ApiTokenHandler.ClaimType, "grafana"), new Claim(ApiTokenHandler.ScopeClaimType, ApiToken.Read),
            new Claim(ClaimTypes.Role, @"FIRMA\SQL-Admins")), windows));
    }
}