using System.Net;
using System.Net.Http;
using System.Text.Json;
using Azaion.Missions.E2E.Fixtures;
using Azaion.Missions.E2E.Helpers;
using Xunit;

namespace Azaion.Missions.E2E.Tests.Health;

/// <summary>
/// FT-P-16 (anonymous 200) and FT-P-17 (200 with PG stopped). FT-P-17 is a
/// SkippableFact: it runs only when COMPOSE_RESTART_ENABLED=1 and the e2e
/// container has docker CLI access; otherwise it skips with a clear reason.
/// Traces: AC-7.1, AC-7.2, AC-7.3.
/// </summary>
[Collection("Health")]
[Trait("Category", "Blackbox")]
public sealed class HealthTests : TestBase, IClassFixture<PostgresStopStartFixture>
{
    private readonly PostgresStopStartFixture _pg;

    public HealthTests(PostgresStopStartFixture pg) => _pg = pg;

    [Fact]
    [Trait("Traces", "AC-7.1")]
    [Trait("max_ms", "2000")]
    public async Task FT_P_16_health_returns_200_anonymous_with_lowercase_status_key()
    {
        // Arrange
        using var http = new HttpRequestMessage(HttpMethod.Get, "/health");
        // Explicitly NO Authorization header — health is anonymous.

        // Act
        using var response = await Missions.SendAsync(http);

        // Assert
        await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.OK);
        var raw = await response.Content.ReadAsStringAsync();
        using var doc = JsonDocument.Parse(raw);
        var root = doc.RootElement;
        // The anonymous-object literal in Program.cs declares the key as
        // lowercase "status"; assert that exact contract — a future global
        // PascalCase shift would break consumers.
        Assert.True(root.TryGetProperty("status", out var statusEl), $"missing 'status' key: {raw}");
        Assert.Equal("healthy", statusEl.GetString());
        // Reject any extra keys to pin the envelope.
        var extras = root.EnumerateObject().Select(p => p.Name)
            .Where(n => n != "status").ToArray();
        Assert.True(extras.Length == 0,
            $"unexpected extra keys in /health body: {string.Join(",", extras)}");
    }

    [SkippableFact]
    [Trait("Traces", "AC-7.2,AC-7.3")]
    [Trait("max_ms", "5000")]
    public async Task FT_P_17_health_returns_200_with_postgres_stopped_proves_no_db_ping()
    {
        Skip.IfNot(_pg.Enabled,
            "PostgresStopStartFixture disabled (COMPOSE_RESTART_ENABLED!=1). " +
            "Enable in CI; locally this scenario requires docker socket access.");

        // Arrange
        _pg.Stop();
        try
        {
            using var http = new HttpRequestMessage(HttpMethod.Get, "/health");

            // Act
            using var response = await Missions.SendAsync(http);

            // Assert
            await HttpAssertions.AssertStatusAsync(response, HttpStatusCode.OK);
            var raw = await response.Content.ReadAsStringAsync();
            using var doc = JsonDocument.Parse(raw);
            Assert.Equal("healthy", doc.RootElement.GetProperty("status").GetString());
        }
        finally
        {
            _pg.Start();
        }
    }
}