using System.Net;
using System.Net.Http.Headers;
using SatelliteProvider.TestSupport;

namespace SatelliteProvider.IntegrationTests;

public static class JwtIntegrationTests
{
    private const string ProtectedTilesPath = "/api/satellite/tiles/latlon?lat=47.461747&lon=37.647063&zoom=18";
    private const string ProtectedRegionPath = "/api/satellite/region/00000000-0000-0000-0000-000000000000";

    public static async Task RunAll(string apiUrl, string secret)
    {
        RouteTestHelpers.PrintTestHeader("Test: JWT auth baseline (AZ-487 + AZ-494)");

        await AnonymousRequest_To_AnyEndpoint_Returns401(apiUrl);
        await ExpiredToken_Returns401(apiUrl, secret);
        await InvalidSignature_Returns401(apiUrl, secret);
        await ValidToken_Returns200_OnHealthyEndpoint(apiUrl, secret);
        await WrongIssuer_Returns401(apiUrl, secret);
        await WrongAudience_Returns401(apiUrl, secret);
        await SwaggerDocument_AdvertisesBearerSecurityScheme(apiUrl);

        Console.WriteLine("✓ JWT integration tests: PASSED");
    }

    private static async Task AnonymousRequest_To_AnyEndpoint_Returns401(string apiUrl)
    {
        Console.WriteLine();
        Console.WriteLine("AZ-487 AC-1: Anonymous request to a protected endpoint returns 401");

        using var anon = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(1) };
        var response = await anon.GetAsync(ProtectedTilesPath);
        var status = (int)response.StatusCode;

        if (status != 401)
        {
            throw new Exception($"Expected 401 for anonymous request, got {status}");
        }

        Console.WriteLine($"  ✓ Anonymous request rejected with HTTP {status}");
    }

    private static async Task ExpiredToken_Returns401(string apiUrl, string secret)
    {
        Console.WriteLine();
        Console.WriteLine("AZ-487 AC-2: Expired token returns 401");

        using var client = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(1) };
        var expired = JwtTestHelpers.MintExpired(secret);
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", expired);

        var response = await client.GetAsync(ProtectedTilesPath);
        var status = (int)response.StatusCode;

        if (status != 401)
        {
            throw new Exception($"Expected 401 for expired token, got {status}");
        }

        Console.WriteLine($"  ✓ Expired token rejected with HTTP {status}");
    }

    private static async Task InvalidSignature_Returns401(string apiUrl, string secret)
    {
        Console.WriteLine();
        Console.WriteLine("AZ-487 AC-3: Tampered signature returns 401");

        using var client = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(1) };
        var valid = JwtTestHelpers.MintAuthenticated(secret);
        var tampered = JwtTokenFactory.TamperSignature(valid);
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", tampered);

        var response = await client.GetAsync(ProtectedRegionPath);
        var status = (int)response.StatusCode;

        if (status != 401)
        {
            throw new Exception($"Expected 401 for tampered signature, got {status}");
        }

        Console.WriteLine($"  ✓ Tampered signature rejected with HTTP {status}");
    }

    private static async Task ValidToken_Returns200_OnHealthyEndpoint(string apiUrl, string secret)
    {
        Console.WriteLine();
        Console.WriteLine("AZ-487 AC-4 / AZ-494 AC-3: Valid token with matching iss/aud reaches handler unchanged");

        using var client = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(2) };
        var valid = JwtTestHelpers.MintAuthenticated(secret);
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", valid);

        var response = await client.GetAsync(ProtectedTilesPath);
        var status = (int)response.StatusCode;

        // The endpoint may legitimately return 200 (tile available) or a tile-download-related
        // error; what we care about for AZ-487 is that the request reached the handler at all
        // (i.e. NOT 401 / 403). Treat 200 as confirmation; treat anything other than 401/403 as
        // "passed auth" — the handler decided the outcome.
        if (status == 401 || status == 403)
        {
            var body = await response.Content.ReadAsStringAsync();
            throw new Exception($"Expected valid-token request to bypass auth, got {status}. Body: {body}");
        }

        Console.WriteLine($"  ✓ Valid-token request reached handler (HTTP {status})");
    }

    private static async Task WrongIssuer_Returns401(string apiUrl, string secret)
    {
        Console.WriteLine();
        Console.WriteLine("AZ-494 AC-1: Token with wrong iss returns 401");

        using var client = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(1) };
        var wrongIssuer = JwtTestHelpers.MintAuthenticated(secret, overrideIssuer: "https://wrong-issuer.invalid/");
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", wrongIssuer);

        var response = await client.GetAsync(ProtectedTilesPath);
        var status = (int)response.StatusCode;

        if (status != 401)
        {
            throw new Exception($"Expected 401 for wrong-issuer token, got {status}");
        }

        Console.WriteLine($"  ✓ Wrong-issuer token rejected with HTTP {status}");
    }

    private static async Task WrongAudience_Returns401(string apiUrl, string secret)
    {
        Console.WriteLine();
        Console.WriteLine("AZ-494 AC-2: Token with wrong aud returns 401");

        using var client = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(1) };
        var wrongAudience = JwtTestHelpers.MintAuthenticated(secret, overrideAudience: "wrong-audience-not-satellite");
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", wrongAudience);

        var response = await client.GetAsync(ProtectedTilesPath);
        var status = (int)response.StatusCode;

        if (status != 401)
        {
            throw new Exception($"Expected 401 for wrong-audience token, got {status}");
        }

        Console.WriteLine($"  ✓ Wrong-audience token rejected with HTTP {status}");
    }

    private static async Task SwaggerDocument_AdvertisesBearerSecurityScheme(string apiUrl)
    {
        // AC-7: Swagger UI accepts a Bearer token via the "Authorize" button. The button is
        // rendered only when the OpenAPI document declares a `Bearer` security scheme — so the
        // existence of that scheme in the document is the automatable signal for AC-7.
        Console.WriteLine();
        Console.WriteLine("AZ-487 AC-7: Swagger document advertises Bearer security scheme");

        using var anon = new HttpClient { BaseAddress = new Uri(apiUrl), Timeout = TimeSpan.FromMinutes(1) };
        var response = await anon.GetAsync("/swagger/v1/swagger.json");
        if (!response.IsSuccessStatusCode)
        {
            throw new Exception($"Expected Swagger document to be reachable, got HTTP {(int)response.StatusCode}");
        }

        var body = await response.Content.ReadAsStringAsync();
        using var doc = System.Text.Json.JsonDocument.Parse(body);
        var root = doc.RootElement;

        if (!root.TryGetProperty("components", out var components) ||
            !components.TryGetProperty("securitySchemes", out var schemes) ||
            !schemes.TryGetProperty("Bearer", out var bearer))
        {
            throw new Exception("Swagger document is missing `components.securitySchemes.Bearer`.");
        }

        var type = bearer.GetProperty("type").GetString();
        var scheme = bearer.GetProperty("scheme").GetString();
        var format = bearer.TryGetProperty("bearerFormat", out var bf) ? bf.GetString() : null;

        if (!string.Equals(type, "http", StringComparison.OrdinalIgnoreCase) ||
            !string.Equals(scheme, "bearer", StringComparison.OrdinalIgnoreCase) ||
            !string.Equals(format, "JWT", StringComparison.OrdinalIgnoreCase))
        {
            throw new Exception($"Bearer scheme has wrong shape: type={type}, scheme={scheme}, bearerFormat={format}");
        }

        Console.WriteLine($"  ✓ Swagger document declares Bearer (http, bearer, JWT)");
    }
}
