using Microsoft.Data.SqlClient;
using SQLInsight.Core.Configuration;
using SQLInsight.Repository;

namespace SQLInsight.IntegrationTests;

/// <summary>
/// The instance configuration in the repository (0016): what SQLInsight Web may change with its read-only login and
/// the few grants it has, the configuration file mirrored as read-only instances, discovery results and the request queue.
/// </summary>
[Collection(SqlServerTestGroup.Name)]
[Trait("Category", "Integration")]
public class InstanceConfigurationRepositoryTests(SqlServerFixture sql) : IAsyncLifetime
{
    private readonly string _database = "SQLInsightCfg_" + Guid.NewGuid().ToString("N")[..8];
    private InsightRepository _repository = null!;
    private string _webConnectionString = string.Empty;

    public async Task InitializeAsync()
    {
        await sql.ExecuteAsSaAsync($"CREATE DATABASE [{_database}];");
        _repository = new InsightRepository(sql.DatabaseConnectionString(_database));
        await _repository.MigrateAsync();
    }

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

    private static NewConfiguredInstance Instance(string name, bool monitorNew = false) =>
        new(name, "sql01\\PROD", 1450, "SqlLogin", "sqlinsight", [1, 2, 3], "key-1", "Mandatory", false, monitorNew);

    /// <summary>A login with db_datareader only, like SQLInsight Web's.</summary>
    private async Task<InsightRepository> ReadOnlyRepositoryAsync()
    {
        var login = "web_" + Guid.NewGuid().ToString("N")[..8];
        const string password = "Read-Only-Login-1!";
        await sql.ExecuteAsSaAsync($"""
            CREATE LOGIN [{login}] WITH PASSWORD = N'{password}', CHECK_POLICY = OFF;
            USE [{_database}]; CREATE USER [{login}] FOR LOGIN [{login}]; ALTER ROLE db_datareader ADD MEMBER [{login}];
            """);
        _webConnectionString = new SqlConnectionStringBuilder(sql.DatabaseConnectionString(_database))
        {
            UserID = login, Password = password, IntegratedSecurity = false,
        }.ConnectionString;
        return new InsightRepository(_webConnectionString);
    }

    private static DiscoveredDatabase Db(string name, bool ax = false, bool system = false) =>
        new() { Name = name, DatabaseId = 5, State = "ONLINE", SizeMb = 100, RecoveryModel = "FULL", CompatibilityLevel = 150, HasAccess = true, IsSystem = system, IsDynamicsAx = ax, DynamicsAxVersion = ax ? "3.0" : null };

    [Fact]
    public async Task Web_login_can_change_the_configuration_and_queue_requests_but_nothing_the_agent_records()
    {
        var web = await ReadOnlyRepositoryAsync();
        var now = DateTimeOffset.UtcNow;

        var id = await web.AddConfiguredInstanceAsync(Instance("prod-sql01"), @"FIRMA\anna", now);
        Assert.Equal(ConfigurationChangeOutcome.Changed, await web.UpdateConfiguredInstanceAsync(id,
            new ConfiguredInstanceChange("sql02", null, "Windows", null, null, null, ClearPassword: true, "Optional", true), @"FIRMA\anna", now));
        Assert.Equal(ConfigurationChangeOutcome.Changed, await web.SetInstancePausedAsync(id, true, @"FIRMA\anna", now));
        Assert.Equal(ConfigurationChangeOutcome.Changed, await web.SetMonitorNewDatabasesAsync(id, true, @"FIRMA\anna", now));
        var request = await web.AddAgentRequestAsync(AgentRequestKind.ConnectionTest, id, null, @"FIRMA\anna", now);

        var row = (await _repository.GetConfiguredInstanceAsync(id))!;
        Assert.Equal(("sql02", "Windows", false, true, true, InstanceSource.Web), (row.Server, row.Authentication, row.HasPassword, row.Paused, row.MonitorNewDatabases, row.Source));
        Assert.Equal(AgentRequestStatus.Pending, (await web.GetAgentRequestAsync(request))!.Status);

        // What only the agent does is refused for the web login.
        await Assert.ThrowsAsync<SqlException>(() => web.CompleteAgentRequestAsync(request, true, "{}", null, now));
        await Assert.ThrowsAsync<SqlException>(() => web.SaveDiscoveredDatabasesAsync(id, [Db("Sales")], now));
        await Assert.ThrowsAsync<SqlException>(() => web.PublishAgentKeyAsync(new AgentKeyRow { KeyId = "x", PublicKey = [1], MachineName = "m", ServiceAccount = "a", CreatedAt = DateTime.UtcNow, LastSeenAt = DateTime.UtcNow }));
        await Assert.ThrowsAsync<SqlException>(() => web.SyncConfigFileInstancesAsync([], now));
        await Assert.ThrowsAsync<SqlException>(() => ExecuteAsWebAsync($"DELETE FROM insight.ConfiguredInstances WHERE ConfiguredInstanceId = {id}"));
        await Assert.ThrowsAsync<SqlException>(() => ExecuteAsWebAsync($"UPDATE insight.ConfiguredInstances SET Source = 'ConfigFile' WHERE ConfiguredInstanceId = {id}"));
        await Assert.ThrowsAsync<SqlException>(() => ExecuteAsWebAsync($"UPDATE insight.ConfiguredInstances SET Name = N'x' WHERE ConfiguredInstanceId = {id}"));

        Assert.Equal(ConfigurationChangeOutcome.Changed, await web.RemoveConfiguredInstanceAsync(id, @"FIRMA\anna", now));
        Assert.Null(await _repository.GetConfiguredInstanceAsync(id));
        Assert.Empty(await _repository.GetConfiguredInstancesAsync());
    }

    [Fact]
    public async Task Web_login_chooses_databases_the_agent_found_and_ax_to_hub_sticks_only_to_ax_databases()
    {
        var web = await ReadOnlyRepositoryAsync();
        var now = DateTimeOffset.UtcNow;
        var id = await web.AddConfiguredInstanceAsync(Instance("ax-sql"), null, now);
        await _repository.SaveDiscoveredDatabasesAsync(id, [Db("master", system: true), Db("AX30", ax: true), Db("Sales")], now);

        var unknown = await web.SetDatabaseChoicesAsync(id,
        [
            new DatabaseChoice("AX30", true, true), new DatabaseChoice("Sales", true, true), new DatabaseChoice("master", false, false), new DatabaseChoice("Nope", true, false),
        ], @"FIRMA\anna", now);

        Assert.Equal(["Nope"], unknown);
        var databases = (await _repository.GetConfiguredDatabasesAsync(id)).ToDictionary(d => d.DatabaseName);
        Assert.Equal((true, true), (databases["AX30"].Monitored, databases["AX30"].SendDynamicsAxToHub));
        Assert.Equal((true, false), (databases["Sales"].Monitored, databases["Sales"].SendDynamicsAxToHub)); // not AX: never to the hub
        Assert.True(databases["master"].Monitored); // system databases are always monitored
        Assert.Equal(@"FIRMA\anna", databases["AX30"].SelectionChangedBy);
        await Assert.ThrowsAsync<SqlException>(() => ExecuteAsWebAsync($"UPDATE insight.ConfiguredDatabases SET IsDynamicsAx = 1 WHERE ConfiguredInstanceId = {id}"));
    }

    [Fact]
    public async Task Discovery_adds_new_databases_by_the_instance_setting_and_marks_the_ones_gone()
    {
        var now = DateTimeOffset.UtcNow;
        var manual = await _repository.AddConfiguredInstanceAsync(Instance("manual"), null, now);
        var automatic = await _repository.AddConfiguredInstanceAsync(Instance("automatic", monitorNew: true), null, now);

        var first = await _repository.SaveDiscoveredDatabasesAsync(manual, [Db("master", system: true), Db("Sales"), Db("Old")], now);
        await _repository.SaveDiscoveredDatabasesAsync(automatic, [Db("Sales")], now);
        var second = await _repository.SaveDiscoveredDatabasesAsync(manual, [Db("master", system: true), Db("Sales"), Db("New")], now.AddHours(1));

        Assert.Equal(["master", "Sales", "Old"], first.New);
        Assert.Equal(["New"], second.New);
        Assert.Equal(["Old"], second.Gone);
        var databases = (await _repository.GetConfiguredDatabasesAsync(manual)).ToDictionary(d => d.DatabaseName);
        Assert.Equal((true, false, false), (databases["master"].Monitored, databases["Sales"].Monitored, databases["New"].Monitored));
        Assert.True(databases["Old"].Gone);
        Assert.True((await _repository.GetConfiguredDatabasesAsync(automatic)).Single().Monitored);
        Assert.NotNull((await _repository.GetConfiguredInstanceAsync(manual))!.LastDiscoveryAt);
    }

    [Fact]
    public async Task Configuration_file_instances_are_mirrored_read_only_and_win_over_a_web_instance_with_the_same_name()
    {
        var now = DateTimeOffset.UtcNow;
        var web = await _repository.AddConfiguredInstanceAsync(Instance("prod-sql02"), null, now);

        var ids = await _repository.SyncConfigFileInstancesAsync(
        [
            new ConfigFileInstance("prod-sql01", "sql01", "Windows", null, "Mandatory", false),
            new ConfigFileInstance("prod-sql02", "sql02", "SqlLogin", "mon", "Optional", true),
        ], now);

        var rows = (await _repository.GetConfiguredInstancesAsync()).ToDictionary(r => r.Name);
        Assert.Equal(2, rows.Count);
        Assert.All(rows.Values, r => Assert.True(r.FromConfigFile && r.MonitorNewDatabases && !r.HasPassword));
        Assert.Null(await _repository.GetConfiguredInstanceAsync(web));
        Assert.Equal(ConfigurationChangeOutcome.FromConfigFile, await _repository.RemoveConfiguredInstanceAsync(ids["prod-sql01"], null, now));
        Assert.Equal(ConfigurationChangeOutcome.FromConfigFile, await _repository.UpdateConfiguredInstanceAsync(ids["prod-sql01"],
            new ConfiguredInstanceChange("evil", null, "Windows", null, null, null, false, "Mandatory", false), null, now));
        Assert.Equal(ConfigurationChangeOutcome.Changed, await _repository.SetInstancePausedAsync(ids["prod-sql01"], true, null, now));

        // Started again with one instance changed and one gone: the same row is kept (with its choices), the other deleted.
        var again = await _repository.SyncConfigFileInstancesAsync([new ConfigFileInstance("prod-sql01", "sql01b", "Windows", null, "Mandatory", false)], now);
        Assert.Equal(ids["prod-sql01"], again["prod-sql01"]);
        var row = Assert.Single(await _repository.GetConfiguredInstancesAsync());
        Assert.Equal(("sql01b", true), (row.Server, row.Paused));
    }

    [Fact]
    public async Task A_request_is_claimed_once_and_stale_ones_are_failed_with_a_reason()
    {
        var now = DateTimeOffset.UtcNow;
        var first = await _repository.AddAgentRequestAsync(AgentRequestKind.InstanceDiscovery, null, "{\"host\":null}", "anna", now);
        var second = await _repository.AddAgentRequestAsync(AgentRequestKind.InstanceDiscovery, null, null, "anna", now);

        var claimed = await Task.WhenAll(_repository.ClaimAgentRequestAsync(now), _repository.ClaimAgentRequestAsync(now));
        Assert.Equal([first, second], claimed.Select(c => c!.RequestId).Order());
        Assert.Null(await _repository.ClaimAgentRequestAsync(now));

        await _repository.CompleteAgentRequestAsync(first, true, "{\"instances\":[]}", null, now);
        var third = await _repository.AddAgentRequestAsync(AgentRequestKind.InstanceDiscovery, null, null, "anna", now.AddHours(-2));
        await _repository.CleanUpAgentRequestsAsync(now.AddMinutes(30), TimeSpan.FromMinutes(10), TimeSpan.FromMinutes(30), TimeSpan.FromDays(30));

        Assert.Equal(AgentRequestStatus.Done, (await _repository.GetAgentRequestAsync(first))!.Status);
        Assert.Contains("stoppet", (await _repository.GetAgentRequestAsync(second))!.Error, StringComparison.Ordinal);
        Assert.Contains("tog ikke anmodningen op", (await _repository.GetAgentRequestAsync(third))!.Error, StringComparison.Ordinal);
        Assert.Equal(third, (await _repository.GetLatestAgentRequestAsync(null, AgentRequestKind.InstanceDiscovery))!.RequestId);
    }

    [Fact]
    public async Task The_newest_agent_key_is_the_one_passwords_are_sealed_with()
    {
        var old = DateTime.UtcNow.AddDays(-1);
        await _repository.PublishAgentKeyAsync(new AgentKeyRow { KeyId = "old", PublicKey = [1], MachineName = "AGENT00", ServiceAccount = "a", CreatedAt = old, LastSeenAt = old });
        await _repository.PublishAgentKeyAsync(new AgentKeyRow { KeyId = "new", PublicKey = [2], MachineName = "AGENT01", ServiceAccount = @"NT SERVICE\SQLInsight Agent", Domain = "FIRMA", CreatedAt = DateTime.UtcNow, LastSeenAt = DateTime.UtcNow });

        var key = await (await ReadOnlyRepositoryAsync()).GetCurrentAgentKeyAsync();

        Assert.Equal(("new", "AGENT01", "FIRMA"), (key!.KeyId, key.MachineName, key.Domain));
    }

    private async Task ExecuteAsWebAsync(string sql)
    {
        await using var connection = new SqlConnection(_webConnectionString);
        await connection.OpenAsync();
        await using var command = connection.CreateCommand();
        command.CommandText = sql;
        await command.ExecuteNonQueryAsync();
    }
}