using System.Net;
using System.Net.Http.Headers;
using System.Text.Json;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.Extensions.DependencyInjection;
using SQLInsight.Core.Data;
using SQLInsight.Core.Findings;
using SQLInsight.Core.Instances;
using SQLInsight.Repository;
using SQLInsight.Rules.Engine;
using SQLInsight.Web.Api;

namespace SQLInsight.IntegrationTests;

/// <summary>/api/v1 and /metrics with Windows authentication switched on and bearer tokens for machines.</summary>
[Collection(SqlServerTestGroup.Name)]
[Trait("Category", "Integration")]
public class WebApiTests(SqlServerFixture sql) : IAsyncLifetime
{
    private const string Token = "sqli_test-token-for-prometheus";

    private readonly string _database = "SQLInsightApi_" + Guid.NewGuid().ToString("N")[..8];
    private WebApplicationFactory<Program> _factory = null!;
    private int _port;

    public async Task InitializeAsync()
    {
        using (var probe = new System.Net.Sockets.TcpListener(IPAddress.Loopback, 0))
        {
            probe.Start();
            _port = ((IPEndPoint)probe.LocalEndpoint).Port;
        }

        await sql.ExecuteAsSaAsync($"CREATE DATABASE [{_database}];");
        var repository = new InsightRepository(sql.DatabaseConnectionString(_database));
        await repository.MigrateAsync();
        var id = await repository.UpsertInstanceAsync("prod \"sql01\"", new InstanceInfo
        {
            ServerName = "SQL01", Version = SqlServerVersion.Parse("16.0.4175.1"), ProductLevel = "RTM", ProductUpdateLevel = "CU20",
            Edition = "Enterprise Edition", EngineEdition = EngineEdition.Enterprise,
        }, "SqlClient", false, DateTimeOffset.UtcNow);
        await repository.SaveRuleResultsAsync(id,
        [
            new RuleResult
            {
                RuleId = "SQLI-BLK-001", RuleTitle = "Blocking", Outcome = RuleOutcome.Findings,
                Findings =
                [
                    new Finding
                    {
                        RuleId = "SQLI-BLK-001", Severity = Severity.High, Title = "Session 87 blokerer 14 sessioner", Explanation = "e", Recommendation = "r",
                        Subject = "session: 87",
                        Evidence = [new Evidence("Blokerede sessioner", "14"), new Evidence("Head blockers SQL", "UPDATE dbo.Kunder SET Cpr = '010101-1234'", Sensitive: true)],
                    },
                ],
            },
        ], DateTimeOffset.UtcNow);
        await sql.ExecuteAsSaAsync($"INSERT [{_database}].insight.MetricSamples (InstanceId, Metric, SampledAt, Value) VALUES ({id}, 'cpu.sqlserver', SYSUTCDATETIME(), 42.5);");

        _factory = new WebApplicationFactory<Program>().WithWebHostBuilder(b =>
        {
            b.UseEnvironment("Development");
            b.UseSetting("SQLInsight:Repository:ConnectionString", sql.DatabaseConnectionString(_database));
            b.UseSetting("SQLInsight:Web:Authentication", "Windows");
            b.UseSetting("SQLInsight:Web:AllowedGroups:0", @"DOMÆNE\SQL-Admins");
            b.UseSetting("SQLInsight:Web:ApiTokens:prometheus", "sha256:" + ApiTokenHandler.Hash(Token));
            b.UseSetting("urls", $"http://127.0.0.1:{_port}");
        });

        // Negotiate needs a real server (Kestrel), not the in-memory test server.
        _factory.UseKestrel();
        _factory.StartServer();

    }

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

    private HttpClient Client(string? token)
    {
        var client = _factory.CreateClient(new WebApplicationFactoryClientOptions { AllowAutoRedirect = false, BaseAddress = new Uri($"http://127.0.0.1:{_port}") });
        if (token is not null)
        {
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
        }

        return client;
    }

    [Fact]
    public async Task Metrics_are_served_in_prometheus_format_with_a_valid_token()
    {
        var response = await Client(Token).GetAsync("/metrics");
        var text = await response.Content.ReadAsStringAsync();

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        Assert.StartsWith("text/plain", response.Content.Headers.ContentType!.MediaType, StringComparison.Ordinal);
        Assert.Contains("sqlinsight_instance_up{instance=\"prod \\\"sql01\\\"\"} 1", text, StringComparison.Ordinal);
        Assert.Contains("sqlinsight_findings{instance=\"prod \\\"sql01\\\"\",severity=\"high\"} 1", text, StringComparison.Ordinal);
        Assert.Contains("sqlinsight_rule_findings{instance=\"prod \\\"sql01\\\"\",rule=\"SQLI-BLK-001\",severity=\"high\"} 1", text, StringComparison.Ordinal);
        Assert.Contains("sqlinsight_metric{instance=\"prod \\\"sql01\\\"\",metric=\"cpu.sqlserver\"} 42.5", text, StringComparison.Ordinal);
        Assert.Contains("# TYPE sqlinsight_findings gauge", text, StringComparison.Ordinal);
        // The version from Directory.Build.props (or the release tag), whatever it currently is.
        var version = typeof(IntegrationEndpoints).Assembly
            .GetCustomAttributes(typeof(System.Reflection.AssemblyInformationalVersionAttribute), false)
            .Cast<System.Reflection.AssemblyInformationalVersionAttribute>().Single().InformationalVersion.Split('+')[0];
        Assert.Contains($"sqlinsight_build_info{{version=\"{version}\"", text, StringComparison.Ordinal);
    }

    [Fact]
    public async Task Findings_api_leaves_out_sensitive_evidence()
    {
        var json = await Client(Token).GetStringAsync("/api/v1/findings?minSeverity=High");

        using var document = JsonDocument.Parse(json);
        var finding = Assert.Single(document.RootElement.EnumerateArray());
        Assert.Equal("SQLI-BLK-001", finding.GetProperty("ruleId").GetString());
        Assert.Contains("[udeladt]", json, StringComparison.Ordinal);
        Assert.DoesNotContain("010101-1234", json, StringComparison.Ordinal);
        Assert.Equal(0, JsonDocument.Parse(await Client(Token).GetStringAsync("/api/v1/findings?minSeverity=Critical")).RootElement.GetArrayLength());
    }

    [Theory]
    [InlineData(null, "/metrics")]
    [InlineData("forkert-token", "/metrics")]
    [InlineData("forkert-token", "/api/v1/instances")]
    [InlineData(Token, "/")]
    [InlineData(Token, "/fund")]
    public async Task Without_a_valid_token_or_outside_the_api_access_is_refused(string? token, string path)
    {
        var response = await Client(token).GetAsync(path);

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }
}

/// <summary>The /api/v1 read endpoints for findings, rules, reports and the pages, with paging, redaction and OpenAPI.</summary>
[Collection(SqlServerTestGroup.Name)]
[Trait("Category", "Integration")]
public class ApiV1Tests(SqlServerFixture sql) : IAsyncLifetime
{
    private readonly string _database = "SQLInsightApiV1_" + Guid.NewGuid().ToString("N")[..8];
    private WebApplicationFactory<Program> _factory = null!;
    private InsightRepository _repository = null!;
    private int _instanceId;
    private const string Name = @"AX01\AX30";

    public async Task InitializeAsync()
    {
        await sql.ExecuteAsSaAsync($"CREATE DATABASE [{_database}];");
        _repository = new InsightRepository(sql.DatabaseConnectionString(_database));
        await _repository.MigrateAsync();
        var now = DateTimeOffset.UtcNow;
        _instanceId = await _repository.UpsertInstanceAsync(Name, new InstanceInfo
        {
            ServerName = "AX01", Version = SqlServerVersion.Parse("16.0.4135.4"), ProductLevel = "RTM", Edition = "Standard Edition", EngineEdition = EngineEdition.Standard,
        }, "SqlClient", false, now);
        var findings = Enumerable.Range(1, 5).Select(i => new Finding
        {
            RuleId = "SQLI-DB-007", Severity = i == 1 ? Severity.Critical : Severity.Medium, Title = $"Ingen backup af Db{i}", Explanation = "e", Recommendation = "r",
            Subject = $"database: Db{i}", FixScript = "BACKUP DATABASE …",
            Evidence = [new Evidence("Database", $"Db{i}"), new Evidence("Login", @"KUNDE\anne", Sensitive: true)],
        }).ToArray();
        await _repository.SaveRuleResultsAsync(_instanceId,
            [new RuleResult { RuleId = "SQLI-DB-007", RuleTitle = "Fuld backup", Outcome = RuleOutcome.Findings, Findings = findings },
             new RuleResult { RuleId = "LOCAL-AX-001", RuleTitle = "Lokal regel", Outcome = RuleOutcome.Passed },
             new RuleResult { RuleId = "SQLI-DB-009", RuleTitle = "CHECKDB", Outcome = RuleOutcome.ManualCheck, Reason = "Kan ikke måles på SQL Server 2014 – tjek manuelt. Se dbi_dbccLastKnownGood." }], now);
        await _repository.SaveCollectedAsync(_instanceId, "wait-sampling", WaitSampling.Aggregate(
            [new WaitingRequest(60, "LCK_M_U", 3000, "AXDB", "0xAB", "UPDATE NUMBERSEQUENCETABLE SET NEXTREC = 1", 55)], now.AddMinutes(-1)));

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

    private async Task<JsonElement> GetJsonAsync(string path)
    {
        var response = await _factory.CreateClient().GetAsync(path);
        Assert.True(response.IsSuccessStatusCode, $"{path}: {(int)response.StatusCode} {await response.Content.ReadAsStringAsync()}");
        return JsonDocument.Parse(await response.Content.ReadAsStringAsync()).RootElement.Clone();
    }

    [Fact]
    public async Task Findings_are_filtered_and_paged_with_a_continuation()
    {
        var client = _factory.CreateClient();
        var first = await client.GetAsync("/api/v1/findings?status=all&instance=" + Uri.EscapeDataString(Name) + "&limit=2&sort=firstSeen");
        var continuation = first.Headers.GetValues("X-Continuation").Single();
        var page1 = JsonDocument.Parse(await first.Content.ReadAsStringAsync()).RootElement;
        var page2 = await GetJsonAsync($"/api/v1/findings?status=all&limit=2&sort=firstSeen&continuation={continuation}");
        var critical = await GetJsonAsync("/api/v1/findings?minSeverity=Critical");
        var byDatabase = await GetJsonAsync("/api/v1/findings?database=Db3&category=DB");
        var resolved = await GetJsonAsync("/api/v1/findings?status=resolved");

        Assert.Equal(2, page1.GetArrayLength());
        Assert.Equal(2, page2.GetArrayLength());
        Assert.NotEqual(page1[0].GetProperty("id").GetInt64(), page2[0].GetProperty("id").GetInt64());
        Assert.Equal("Ingen backup af Db1", Assert.Single(critical.EnumerateArray()).GetProperty("title").GetString());
        Assert.Equal("database: Db3", Assert.Single(byDatabase.EnumerateArray()).GetProperty("subject").GetString());
        Assert.Equal(0, resolved.GetArrayLength());
        Assert.Equal(HttpStatusCode.BadRequest, (await client.GetAsync("/api/v1/findings?status=nogle")).StatusCode);
    }

    [Fact]
    public async Task One_finding_has_explanation_fix_script_history_and_no_sensitive_values()
    {
        var list = await GetJsonAsync("/api/v1/findings?minSeverity=Critical");
        var id = list[0].GetProperty("id").GetInt64();

        var finding = await GetJsonAsync($"/api/v1/findings/{id}");
        var text = finding.GetRawText();

        Assert.Equal("BACKUP DATABASE …", finding.GetProperty("fixScript").GetString());
        Assert.Equal("active", finding.GetProperty("history").GetProperty("status").GetString());
        Assert.Contains("[udeladt]", text, StringComparison.Ordinal);
        Assert.DoesNotContain("anne", text, StringComparison.Ordinal);
        Assert.Equal(HttpStatusCode.NotFound, (await _factory.CreateClient().GetAsync("/api/v1/findings/999999")).StatusCode);
    }

    [Fact]
    public async Task Rules_and_rule_states_list_built_in_community_and_local_rules()
    {
        var rules = await GetJsonAsync("/api/v1/rules");
        var states = await GetJsonAsync($"/api/v1/instances/{Uri.EscapeDataString(Name)}/rule-states");

        Assert.Contains(rules.EnumerateArray(), r => r.GetProperty("id").GetString() == "SQLI-SEC-001" && r.GetProperty("source").GetString() == "indbygget");
        Assert.Contains(rules.EnumerateArray(), r => r.GetProperty("id").GetString() == "COM-FT-005" && r.GetProperty("source").GetString() == "community");
        Assert.Contains(rules.EnumerateArray(), r => r.GetProperty("id").GetString() == "LOCAL-AX-001" && r.GetProperty("source").GetString() == "lokal");
        Assert.Contains(states.EnumerateArray(), s => s.GetProperty("ruleId").GetString() == "SQLI-DB-007" && s.GetProperty("outcome").GetString() == "findings");
    }

    [Theory]
    [InlineData("driftsrapport", "")]
    [InlineData("analyse", "&instance=AX01%5CAX30")]
    [InlineData("rettigheder", "&instance=AX01%5CAX30")]
    public async Task Every_report_comes_as_json_and_pdf(string type, string parameters)
    {
        var client = _factory.CreateClient();
        var json = await GetJsonAsync($"/api/v1/reports/{type}?format=json{parameters}");
        var pdf = await client.GetAsync($"/api/v1/reports/{type}?format=pdf{parameters}");
        var list = await GetJsonAsync("/api/v1/reports");

        Assert.Equal(JsonValueKind.Object, json.ValueKind);
        Assert.Equal("application/pdf", pdf.Content.Headers.ContentType?.MediaType);
        Assert.Contains(list.EnumerateArray(), r => r.GetProperty("type").GetString() == type);
    }

    [Fact]
    public async Task Page_data_is_served_with_statement_texts_left_out()
    {
        var name = Uri.EscapeDataString(Name);
        var waits = await GetJsonAsync($"/api/v1/instances/{name}/wait-types/LCK_M_U");
        var analysis = await GetJsonAsync($"/api/v1/instances/{name}/analysis");
        var topSql = await GetJsonAsync($"/api/v1/instances/{name}/top-sql");
        var disks = await GetJsonAsync($"/api/v1/instances/{name}/disks");
        var configuration = await GetJsonAsync($"/api/v1/instances/{name}/configuration?days=30");
        var privileges = await GetJsonAsync($"/api/v1/instances/{name}/privileges");
        var all = await GetJsonAsync("/api/v1/privileges?days=7");

        Assert.Equal("Venter på en lås", waits.GetProperty("explanation").GetProperty("title").GetString());
        var statement = Assert.Single(waits.GetProperty("statements").EnumerateArray());
        Assert.Equal("[udeladt]", statement.GetProperty("text").GetString());
        Assert.Equal(1, statement.GetProperty("samples").GetInt64());
        Assert.True(analysis.TryGetProperty("metrics", out _));
        Assert.True(topSql.TryGetProperty("queries", out _));
        Assert.True(disks.TryGetProperty("drives", out _));
        Assert.True(configuration.TryGetProperty("changes", out _));
        Assert.Equal(Name, privileges.GetProperty("instance").GetString());
        Assert.Equal(1, all.GetProperty("instances").GetArrayLength());
    }


    [Fact]
    public async Task Manual_checks_are_their_own_outcome_on_pages_and_in_the_api()
    {
        var client = _factory.CreateClient();
        var states = await GetJsonAsync($"/api/v1/instances/{Uri.EscapeDataString(Name)}/rule-states");
        var instances = await GetJsonAsync("/api/v1/instances");
        var page = await client.GetStringAsync($"/instanser/{Uri.EscapeDataString(Name)}");
        var home = await client.GetStringAsync("/");

        Assert.Contains(states.EnumerateArray(), s => s.GetProperty("ruleId").GetString() == "SQLI-DB-009" && s.GetProperty("outcome").GetString() == "manualCheck");
        var instance = Assert.Single(instances.EnumerateArray());
        Assert.Equal(1, instance.GetProperty("manualChecks").GetInt32());
        Assert.Equal(0, instance.GetProperty("notMeasurable").GetInt32());
        Assert.Contains("Skal tjekkes manuelt", page, StringComparison.Ordinal);
        Assert.Contains("dbi_dbccLastKnownGood", page, StringComparison.Ordinal);
        Assert.Contains("skal tjekkes manuelt", home, StringComparison.Ordinal);
    }
    [Fact]
    public async Task Openapi_describes_every_api_v1_endpoint()
    {
        var document = await GetJsonAsync("/api/v1/openapi.json");
        var described = document.GetProperty("paths").EnumerateObject().Select(p => p.Name).ToHashSet(StringComparer.OrdinalIgnoreCase);
        var endpoints = _factory.Services.GetRequiredService<Microsoft.AspNetCore.Routing.EndpointDataSource>().Endpoints
            .OfType<Microsoft.AspNetCore.Routing.RouteEndpoint>()
            .Select(e => "/" + e.RoutePattern.RawText!.TrimStart('/'))
            .Where(p => p.StartsWith("/api/v1/", StringComparison.OrdinalIgnoreCase) && !p.EndsWith("openapi.json", StringComparison.OrdinalIgnoreCase))
            .Select(p => System.Text.RegularExpressions.Regex.Replace(p, @"\{([^}:]+)(:[^}]+)?\}", "{$1}").TrimEnd('/'))
            .Distinct()
            .ToList();

        Assert.NotEmpty(endpoints);
        Assert.All(endpoints, e => Assert.Contains(e, described));
    }
}