using MeterVault.Infrastructure.Ingestion;
using Microsoft.Extensions.Logging.Abstractions;

namespace MeterVault.Integration.Tests.Ingestion;

/// <summary>
/// The HA connection tester must fail closed on missing config <em>before</em> any network call —
/// so a misconfigured connector gives a clear message, never an exception. The stub factory throws
/// if the tester ever tries to create an HttpClient, proving these branches never reach the network.
/// </summary>
public sealed class HaConnectionTesterTests
{
    [Fact]
    public async Task Missing_base_url_fails_without_network()
    {
        var result = await NewTester().TestAsync(baseUrl: "", tokenEnv: "SOME_TOKEN", entityId: null);

        Assert.False(result.Ok);
        Assert.Contains("Base URL", result.Message, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task Missing_token_env_fails_without_network()
    {
        var result = await NewTester().TestAsync(baseUrl: "http://ha.local:8123", tokenEnv: "", entityId: null);

        Assert.False(result.Ok);
        Assert.Contains("env-var", result.Message, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task Unset_token_env_var_fails_without_network()
    {
        var result = await NewTester().TestAsync(
            baseUrl: "http://ha.local:8123", tokenEnv: "METERVAULT_DEFINITELY_UNSET_TOKEN_VAR", entityId: null);

        Assert.False(result.Ok);
        Assert.Contains("is not set", result.Message, StringComparison.OrdinalIgnoreCase);
    }

    private static HaConnectionTester NewTester() =>
        new(new ThrowingHttpClientFactory(), NullLogger<HaConnectionTester>.Instance);

    private sealed class ThrowingHttpClientFactory : IHttpClientFactory
    {
        public HttpClient CreateClient(string name) =>
            throw new InvalidOperationException("Network must not be touched for a config-guard failure.");
    }
}