// =============================================================================
// ApprovalEndpointsTests.cs
// Sprint: SPRINT_3801_0001_0005_approvals_api
// Task: API-005 - Integration tests for approval endpoints
// =============================================================================

using System.Net;
using System.Net.Http.Json;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using StellaOps.Scanner.WebService.Contracts;
using StellaOps.Scanner.WebService.Endpoints;
using StellaOps.Scanner.WebService.Services;
using Xunit;

namespace StellaOps.Scanner.WebService.Tests;

[Trait("Category", "Integration")]
[Trait("Sprint", "3801.0001")]
public sealed class ApprovalEndpointsTests : IDisposable
{
    private readonly TestSurfaceSecretsScope _secrets;
    private readonly ScannerApplicationFactory _factory;
    private readonly HttpClient _client;

    public ApprovalEndpointsTests()
    {
        _secrets = new TestSurfaceSecretsScope();

        // Use default factory without auth overrides - same pattern as ManifestEndpointsTests
        // The factory defaults to anonymous auth which allows all policy assertions
        _factory = new ScannerApplicationFactory();

        _client = _factory.CreateClient();
    }

    public void Dispose()
    {
        _client.Dispose();
        _factory.Dispose();
        _secrets.Dispose();
    }

    #region POST /approvals Tests

    [Fact(DisplayName = "POST /approvals creates approval successfully")]
    public async Task CreateApproval_ValidRequest_Returns201()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var request = new
        {
            finding_id = "CVE-2024-12345",
            decision = "AcceptRisk",
            justification = "Risk accepted for testing purposes"
        };

        // Act
        var response = await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", request);

        // Assert
        Assert.Equal(HttpStatusCode.Created, response.StatusCode);

        var approval = await response.Content.ReadFromJsonAsync<ApprovalResponse>();
        Assert.NotNull(approval);
        Assert.Equal("CVE-2024-12345", approval!.FindingId);
        Assert.Equal("AcceptRisk", approval.Decision);
        Assert.NotNull(approval.AttestationId);
        Assert.StartsWith("sha256:", approval.AttestationId);
    }

    [Fact(DisplayName = "POST /approvals rejects empty finding_id")]
    public async Task CreateApproval_EmptyFindingId_Returns400()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var request = new
        {
            finding_id = "",
            decision = "AcceptRisk",
            justification = "Test justification"
        };

        // Act
        var response = await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", request);

        // Assert
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Fact(DisplayName = "POST /approvals rejects empty justification")]
    public async Task CreateApproval_EmptyJustification_Returns400()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var request = new
        {
            finding_id = "CVE-2024-12345",
            decision = "AcceptRisk",
            justification = ""
        };

        // Act
        var response = await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", request);

        // Assert
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Fact(DisplayName = "POST /approvals rejects invalid decision")]
    public async Task CreateApproval_InvalidDecision_Returns400()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var request = new
        {
            finding_id = "CVE-2024-12345",
            decision = "InvalidDecision",
            justification = "Test justification"
        };

        // Act
        var response = await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", request);

        // Assert
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);

        var problem = await response.Content.ReadFromJsonAsync<ProblemDetails>();
        Assert.NotNull(problem);
        Assert.Equal("Invalid decision value", problem!.Title);
    }

    [Fact(DisplayName = "POST /approvals rejects whitespace-only scanId")]
    public async Task CreateApproval_WhitespaceScanId_Returns400()
    {
        // Arrange - ScanId.TryParse accepts any non-empty string,
        // but rejects whitespace-only or empty strings
        var request = new
        {
            finding_id = "CVE-2024-12345",
            decision = "AcceptRisk",
            justification = "Test justification"
        };

        // Act - using whitespace-only scan ID which should be rejected
        var response = await _client.PostAsJsonAsync("/api/v1/scans/   /approvals", request);

        // Assert
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Theory(DisplayName = "POST /approvals accepts all valid decision types")]
    [InlineData("AcceptRisk")]
    [InlineData("Defer")]
    [InlineData("Reject")]
    [InlineData("Suppress")]
    [InlineData("Escalate")]
    public async Task CreateApproval_AllDecisionTypes_Accepted(string decision)
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var request = new
        {
            finding_id = $"CVE-2024-{Guid.NewGuid():N}",
            decision,
            justification = "Test justification for decision type test"
        };

        // Act
        var response = await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", request);

        // Assert
        Assert.Equal(HttpStatusCode.Created, response.StatusCode);

        var approval = await response.Content.ReadFromJsonAsync<ApprovalResponse>();
        Assert.NotNull(approval);
        Assert.Equal(decision, approval!.Decision);
    }

    #endregion

    #region GET /approvals Tests

    [Fact(DisplayName = "GET /approvals returns empty list for new scan")]
    public async Task ListApprovals_NewScan_ReturnsEmptyList()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();

        // Act
        var response = await _client.GetAsync($"/api/v1/scans/{scanId}/approvals");

        // Assert
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var result = await response.Content.ReadFromJsonAsync<ApprovalListResponse>();
        Assert.NotNull(result);
        Assert.Equal(scanId, result!.ScanId);
        Assert.Empty(result.Approvals);
        Assert.Equal(0, result.TotalCount);
    }

    [Fact(DisplayName = "GET /approvals returns created approvals")]
    public async Task ListApprovals_WithApprovals_ReturnsAll()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();

        // Create two approvals
        await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", new
        {
            finding_id = "CVE-2024-0001",
            decision = "AcceptRisk",
            justification = "First approval"
        });
        await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", new
        {
            finding_id = "CVE-2024-0002",
            decision = "Defer",
            justification = "Second approval"
        });

        // Act
        var response = await _client.GetAsync($"/api/v1/scans/{scanId}/approvals");

        // Assert
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var result = await response.Content.ReadFromJsonAsync<ApprovalListResponse>();
        Assert.NotNull(result);
        Assert.Equal(2, result!.Approvals.Count);
        Assert.Equal(2, result.TotalCount);
    }

    [Fact(DisplayName = "GET /approvals/{findingId} returns specific approval")]
    public async Task GetApproval_Existing_ReturnsApproval()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var findingId = "CVE-2024-99999";

        await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", new
        {
            finding_id = findingId,
            decision = "Suppress",
            justification = "False positive for testing"
        });

        // Act
        var response = await _client.GetAsync($"/api/v1/scans/{scanId}/approvals/{findingId}");

        // Assert
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var approval = await response.Content.ReadFromJsonAsync<ApprovalResponse>();
        Assert.NotNull(approval);
        Assert.Equal(findingId, approval!.FindingId);
        Assert.Equal("Suppress", approval.Decision);
    }

    [Fact(DisplayName = "GET /approvals/{findingId} returns 404 for non-existent")]
    public async Task GetApproval_NonExistent_Returns404()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();

        // Act
        var response = await _client.GetAsync($"/api/v1/scans/{scanId}/approvals/CVE-2024-99999");

        // Assert
        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
    }

    #endregion

    #region DELETE /approvals Tests

    [Fact(DisplayName = "DELETE /approvals/{findingId} revokes existing approval")]
    public async Task RevokeApproval_Existing_Returns204()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var findingId = "CVE-2024-88888";

        await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", new
        {
            finding_id = findingId,
            decision = "AcceptRisk",
            justification = "Test approval to be revoked"
        });

        // Act
        var response = await _client.DeleteAsync($"/api/v1/scans/{scanId}/approvals/{findingId}");

        // Assert
        Assert.Equal(HttpStatusCode.NoContent, response.StatusCode);
    }

    [Fact(DisplayName = "DELETE /approvals/{findingId} returns 404 for non-existent")]
    public async Task RevokeApproval_NonExistent_Returns404()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();

        // Act
        var response = await _client.DeleteAsync($"/api/v1/scans/{scanId}/approvals/CVE-2024-nonexistent");

        // Assert
        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
    }

    [Fact(DisplayName = "Revoked approval excluded from list")]
    public async Task RevokeApproval_ExcludedFromList()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var findingId = "CVE-2024-77777";

        await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", new
        {
            finding_id = findingId,
            decision = "AcceptRisk",
            justification = "Test approval"
        });

        // Revoke
        await _client.DeleteAsync($"/api/v1/scans/{scanId}/approvals/{findingId}");

        // Act
        var response = await _client.GetAsync($"/api/v1/scans/{scanId}/approvals");

        // Assert
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var result = await response.Content.ReadFromJsonAsync<ApprovalListResponse>();
        Assert.NotNull(result);
        Assert.Empty(result!.Approvals);
    }

    [Fact(DisplayName = "Revoked approval still retrievable with revoked flag")]
    public async Task RevokeApproval_StillRetrievable()
    {
        // Arrange
        var scanId = await CreateTestScanAsync();
        var findingId = "CVE-2024-66666";

        await _client.PostAsJsonAsync($"/api/v1/scans/{scanId}/approvals", new
        {
            finding_id = findingId,
            decision = "AcceptRisk",
            justification = "Test approval"
        });

        // Revoke
        await _client.DeleteAsync($"/api/v1/scans/{scanId}/approvals/{findingId}");

        // Act
        var response = await _client.GetAsync($"/api/v1/scans/{scanId}/approvals/{findingId}");

        // Assert
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);

        var approval = await response.Content.ReadFromJsonAsync<ApprovalResponse>();
        Assert.NotNull(approval);
        Assert.True(approval!.IsRevoked);
    }

    #endregion

    #region Helper Methods

    private async Task<string> CreateTestScanAsync()
    {
        // Generate a valid scan ID
        var scanId = Guid.NewGuid().ToString();
        return scanId;
    }

    #endregion
}