Tau.Acuvim/portal/tests/Tau.Acuvim.Portal.Tests/ConnectionStringResolverTests.cs

using Tau.Acuvim.Portal.Configuration;
using Tau.Acuvim.Portal.Tests.Helpers;

namespace Tau.Acuvim.Portal.Tests;

public class ConnectionStringResolverTests
{
    [Fact]
    public void ExplicitConnectionString_WinsOverEverything()
    {
        var db = new DatabaseOptions
        {
            ConnectionString = "Host=elsewhere;Database=mydb;Username=u;Password=p",
            AutoProvisionLocalTimescaleDb = true
        };
        var ts = new TimescaleDbOptions { Host = "ignored" };
        var env = new FakeHostEnvironment("Production");

        var r = ConnectionStringResolver.Resolve(db, ts, env);

        Assert.Equal("Host=elsewhere;Database=mydb;Username=u;Password=p", r.ConnectionString);
        Assert.Equal("Database:ConnectionString", r.Source);
    }

    [Fact]
    public void AutoProvision_InDev_BuildsFromTimescaleBlock()
    {
        var db = new DatabaseOptions { ConnectionString = "", AutoProvisionLocalTimescaleDb = true };
        var ts = new TimescaleDbOptions
        {
            Host = "timescaledb",
            Port = 5432,
            Database = "power_monitoring",
            Username = "power_user",
            Password = "local_secret"
        };
        var env = new FakeHostEnvironment("Development");

        var r = ConnectionStringResolver.Resolve(db, ts, env);

        Assert.Equal(
            "Host=timescaledb;Port=5432;Database=power_monitoring;Username=power_user;Password=local_secret",
            r.ConnectionString);
        Assert.Contains("auto-provision", r.Source, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void AutoProvision_InProduction_Throws()
    {
        var db = new DatabaseOptions { ConnectionString = "", AutoProvisionLocalTimescaleDb = true };
        var ts = new TimescaleDbOptions();
        var env = new FakeHostEnvironment("Production");

        var ex = Assert.Throws<InvalidOperationException>(
            () => ConnectionStringResolver.Resolve(db, ts, env));
        Assert.Contains("not permitted in Production", ex.Message);
    }

    [Fact]
    public void NoConnectionString_AndAutoProvisionOff_Throws()
    {
        var db = new DatabaseOptions { ConnectionString = "", AutoProvisionLocalTimescaleDb = false };
        var ts = new TimescaleDbOptions();
        var env = new FakeHostEnvironment("Development");

        var ex = Assert.Throws<InvalidOperationException>(
            () => ConnectionStringResolver.Resolve(db, ts, env));
        Assert.Contains("No database connection string available", ex.Message);
    }

    [Theory]
    [InlineData("Staging")]
    [InlineData("Production")]
    public void AutoProvisionOff_AnyEnvironment_Throws(string envName)
    {
        var db = new DatabaseOptions { ConnectionString = "", AutoProvisionLocalTimescaleDb = false };
        var ts = new TimescaleDbOptions();
        var env = new FakeHostEnvironment(envName);

        Assert.Throws<InvalidOperationException>(
            () => ConnectionStringResolver.Resolve(db, ts, env));
    }
}