using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using Campaign_Tracker.Server.Audit;
using Campaign_Tracker.Server.ElectionCycles;
using Microsoft.Extensions.DependencyInjection;

namespace Campaign_Tracker.Server.Tests;

public sealed partial class ElectionCycleJobControllerTests
{
    [Fact]
    public async Task CreateJob_ValidRequestWithExistingCycle_Returns201AndInSetupStatus_AC1_AC3()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "FAIR01", cycleId = "2026-primary", cycleName = "2026 Primary" });

        Assert.Equal(HttpStatusCode.Created, response.StatusCode);
        var body = await response.Content.ReadFromJsonAsync<ElectionCycleJobDto>();
        Assert.NotNull(body);
        Assert.Equal("FAIR01", body.JCode);
        Assert.Equal("2026-primary", body.CycleId);
        Assert.Equal("2026 Primary", body.CycleName);
        Assert.Equal("In Setup", body.Status);
        Assert.Equal("cs@example.test", body.CreatedBy);
    }

    [Fact]
    public async Task CreateJob_NewCycleName_GeneratesCycleIdAndCreatesJob_AC1()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "PINE03", cycleName = "2027 General" });

        Assert.Equal(HttpStatusCode.Created, response.StatusCode);
        var body = await response.Content.ReadFromJsonAsync<ElectionCycleJobDto>();
        Assert.NotNull(body);
        Assert.Equal("PINE03", body.JCode);
        Assert.Equal("2027-general", body.CycleId);
        Assert.Equal("2027 General", body.CycleName);
        Assert.Equal("In Setup", body.Status);
    }

    [Fact]
    public async Task CreateJob_MissingCycleSelection_Returns422WithValidationMessage_AC4()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "FAIR01" });

        Assert.Equal(HttpStatusCode.UnprocessableEntity, response.StatusCode);
        var problem = await response.Content.ReadFromJsonAsync<ElectionCycleJobProblemDto>();
        Assert.NotNull(problem);
        Assert.Contains("required", problem.Error, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public async Task CreateJob_MissingJCode_ReturnsClientError_AC4()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { cycleId = "2026-primary", cycleName = "2026 Primary" });

        // Either 400 (model binding) or 422 (our validation) — both reject the request.
        Assert.True(response.StatusCode == HttpStatusCode.BadRequest ||
                    response.StatusCode == HttpStatusCode.UnprocessableEntity);
    }

    [Fact]
    public async Task CreateJob_RejectsUnauthenticatedUser_AC5()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var noToken = factory.CreateClient();

        var response = await noToken.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "FAIR01", cycleId = "2026-primary", cycleName = "2026 Primary" });

        Assert.Equal(HttpStatusCode.Unauthorized, response.StatusCode);
    }

    [Fact]
    public async Task CreateJob_RejectsNonClientServicesRole_AC5()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
            "Bearer", AuthIntegrationTestFactory.CreateToken("prod@example.test", "production"));

        var response = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "FAIR01", cycleId = "2026-primary", cycleName = "2026 Primary" });

        Assert.Equal(HttpStatusCode.Forbidden, response.StatusCode);
    }

    [Fact]
    public async Task CreateJob_EmitsAuditEvent_AC5()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "LAKE02", cycleId = "2026-primary", cycleName = "2026 Primary" });

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

        var auditService = factory.Services.GetRequiredService<IAuditService>();
        var events = auditService.GetRecent();
        Assert.Contains(events, e =>
            e.EventType == "ELECTION_CYCLE_JOB_CREATED" &&
            e.ActorIdentity == "cs@example.test" &&
            e.Outcome.Contains("LAKE02"));
    }

    [Fact]
    public async Task CreateJob_DoesNotWriteToLegacyTables_AC5()
    {
        // The repository is IElectionCycleJobRepository — an extension-layer write path.
        // ILegacyDataAccess has only Get* methods (read-only). Verify the interface contract.
        var legacyMethods = typeof(Campaign_Tracker.Server.LegacyData.ILegacyDataAccess).GetMethods();
        Assert.True(
            legacyMethods.All(m => m.Name.StartsWith("Get", StringComparison.Ordinal)),
            "ILegacyDataAccess must only expose read methods — no writes to legacy tables.");
    }

    [Fact]
    public async Task CreateJob_IdempotentForSameJCodeAndCycle()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response1 = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "FAIR01", cycleId = "2026-primary", cycleName = "2026 Primary" });
        var response2 = await client.PostAsJsonAsync(
            "/api/election-cycles/jobs",
            new { jCode = "FAIR01", cycleId = "2026-primary", cycleName = "2026 Primary" });

        Assert.Equal(HttpStatusCode.Created, response1.StatusCode);
        Assert.Equal(HttpStatusCode.Created, response2.StatusCode);

        var body1 = await response1.Content.ReadFromJsonAsync<ElectionCycleJobDto>();
        var body2 = await response2.Content.ReadFromJsonAsync<ElectionCycleJobDto>();
        Assert.NotNull(body1);
        Assert.NotNull(body2);
        Assert.Equal(body1.JobId, body2.JobId);
    }

    [Fact]
    public async Task GetById_UnknownJob_Returns404()
    {
        await using var factory = new AuthIntegrationTestFactory();
        using var client = CreateClient(factory);

        var response = await client.GetAsync("/api/election-cycles/jobs/does-not-exist");
        Assert.Equal(HttpStatusCode.NotFound, response.StatusCode);
    }

    private static HttpClient CreateClient(AuthIntegrationTestFactory factory)
    {
        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(
            "Bearer", AuthIntegrationTestFactory.CreateToken("cs@example.test", "client-services"));
        return client;
    }

    private sealed record ElectionCycleJobDto(
        string JobId,
        string JCode,
        string CycleId,
        string CycleName,
        string Status,
        string CreatedBy,
        string CreatedAt);

    private sealed record ElectionCycleJobProblemDto(string Error);
}