using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using Microsoft.Extensions.DependencyInjection;
using TeamUp.Modules.Assembler.Queue;
using TeamUp.Modules.Assembler.Runtime;
using Xunit;

namespace TeamUp.IntegrationTests;

/// <summary>
/// M6 acceptance — the proof of the bet: a dev marks a story done → Quill (QA) wakes via the
/// handoff trigger, drafts a test plan → it waits in review → approve → analytics show edit
/// distance and approval rate for Aria and Quill. Plus: working memory is written on approval
/// and read back at the next assembly, and the trigger guardrails hold (no self-cascade, at
/// most one handoff per task).
/// </summary>
public sealed class TwoRoleLoopTests(PostgresFixture postgres) : IClassFixture<PostgresFixture>
{
    private sealed record BootstrapResponse(string Token, Guid MemberId, Guid OrganizationId);

    private sealed record IdResponse(Guid Id);

    private sealed record TeamResponse(Guid Id, Guid OrganizationId, string Name);

    private sealed record SeatResponse(Guid Id, Guid TeamId, string RoleName, string State, Guid? MemberId, Guid? AgentId);

    private sealed record SyncResult(int Indexed);

    private sealed record RunResponse(
        Guid Id, Guid SeatId, Guid WorkItemId, Guid? AgentId, string Status,
        string? ActionType, string? ActionRisk, string? Prompt, string? Output, string? Error);

    private sealed record ReviewItemResponse(
        Guid Id, Guid OrganizationId, Guid TeamId, Guid AgentRunId, Guid AgentId, Guid WorkItemId,
        string ActionKind, string Risk, string Title, string Content, List<string> ChildTitles,
        string? Trace, string Status, string? Decision, double? EditDistance, DateTimeOffset CreatedAtUtc);

    private sealed record TaskResponse(
        Guid Id, Guid TeamId, string Title, string? Description, string Type,
        string Status, string AssigneeKind, Guid? AssigneeId, Guid? ParentId);

    private sealed record BoardColumn(string Status, List<TaskResponse> Items);

    private sealed record BoardResponse(Guid TeamId, List<BoardColumn> Columns);

    private sealed record MemoryHitResponse(Guid Id, string Kind, string Content, DateTimeOffset CreatedAtUtc);

    private sealed record EditDistancePoint(DateTimeOffset DecidedAtUtc, double Distance);

    private sealed record AgentAnalytics(
        Guid AgentId, string Name, int Reviews, double? ApprovalRate, double? AvgEditDistance,
        List<EditDistancePoint> Trend);

    private sealed record AnalyticsResponse(
        int TasksDone, int PendingReviews, int Decided, int Approved, int SentBack,
        double? ApprovalRate, double? AvgEditDistance, List<AgentAnalytics> Agents);

    private sealed record AuditEntryResponse(
        Guid Id, string Action, string EntityType, Guid EntityId,
        Guid? ActorMemberId, string? Details, DateTimeOffset OccurredAtUtc);

    [Fact]
    public async Task The_two_role_loop_runs_end_to_end_and_is_measurable()
    {
        var settings = new Dictionary<string, string?>
        {
            ["GitSource:Provider"] = "filesystem",
            ["GitSource:Root"] = LocateSkillsDirectory(),
        };

        await using var factory = new TeamUpWebFactory(postgres.ConnectionString, settings);
        using var anon = factory.CreateClient();

        // --- Setup: owner, org, team, stub BYOK, skills, Aria (PO) + Quill (QA), both gated ---
        var owner = await PostOk<BootstrapResponse>(anon, "/api/identity/bootstrap", new
        {
            organizationName = "AliaSaaS",
            ownerEmail = "owner@alia.test",
            ownerDisplayName = "Owner",
            ownerPassword = "Passw0rd!",
        });
        using var client = Authed(factory, owner.Token);

        await client.PostAsJsonAsync("/api/orgboard/organizations", new { organizationId = owner.OrganizationId, name = "AliaSaaS" });
        var team = await PostOk<TeamResponse>(client, "/api/orgboard/teams", new { organizationId = owner.OrganizationId, name = "IPNOPS" });
        var config = await PostOk<IdResponse>(client, "/api/integrations/api-configs", new
        {
            organizationId = owner.OrganizationId,
            name = "Vertex-Pro",
            provider = "stub",
            model = "gemini-pro",
            apiKey = "sk-demo-key",
        });
        await PostOk<SyncResult>(client, "/api/skills/sync", new { });

        var poSeat = await PostOk<SeatResponse>(client, "/api/orgboard/seats", new { teamId = team.Id, roleName = "Product Owner" });
        await client.PostAsJsonAsync($"/api/orgboard/seats/{poSeat.Id}/agent", new
        {
            name = "Aria",
            monogram = "AR",
            autonomy = "Gated",
            apiConfigId = config.Id,
            skillKeys = new[] { "spec-writing", "story-breakdown" },
            docs = Array.Empty<string>(),
        });
        var qaSeat = await PostOk<SeatResponse>(client, "/api/orgboard/seats", new { teamId = team.Id, roleName = "QA" });
        await client.PostAsJsonAsync($"/api/orgboard/seats/{qaSeat.Id}/agent", new
        {
            name = "Quill",
            monogram = "QU",
            autonomy = "Gated",
            apiConfigId = config.Id,
            skillKeys = new[] { "test-plan-generation", "diff-review" },
            docs = Array.Empty<string>(),
        });

        // --- Aria proposes a spec; the owner corrects it on approval → memory is written ---
        var specTask = await PostOk<TaskResponse>(client, "/api/orgboard/tasks", new
        {
            teamId = team.Id,
            title = "Add a logout button to the header",
            description = "Users need a way to end their session.",
            type = "Spec",
        });
        await PostOk<RunResponse>(client, "/api/assembler/runs", new { seatId = poSeat.Id, workItemId = specTask.Id });
        await DrainOneJob(factory);

        var ariaHeld = Assert.Single((await client.GetFromJsonAsync<List<ReviewItemResponse>>(
            $"/api/governance/reviews?organizationId={owner.OrganizationId}"))!);
        await PostOk<ReviewItemResponse>(client, $"/api/governance/reviews/{ariaHeld.Id}/approve", new
        {
            content = "Spec: a logout button in the header ends the session and returns to sign-in.",
            childTitles = new[] { "Add the logout button", "Clear the session on click" },
        });

        // Working memory was written and is searchable.
        var hits = await client.GetFromJsonAsync<List<MemoryHitResponse>>(
            $"/api/memory/search?teamId={team.Id}&q=logout%20header%20session");
        Assert.NotEmpty(hits!);
        Assert.Contains(hits!, h => h.Kind == "Correction" && h.Content.Contains("logout button"));

        // --- Memory is read back at the NEXT assembly: Aria's second run carries "# Team memory" ---
        var secondTask = await PostOk<TaskResponse>(client, "/api/orgboard/tasks", new
        {
            teamId = team.Id,
            title = "Add a logout link to the mobile header",
            description = (string?)null,
            type = "Spec",
        });
        var secondRun = await PostOk<RunResponse>(client, "/api/assembler/runs", new { seatId = poSeat.Id, workItemId = secondTask.Id });
        await DrainOneJob(factory);
        var secondDone = await client.GetFromJsonAsync<RunResponse>($"/api/assembler/runs/{secondRun.Id}");
        Assert.Equal("Completed", secondDone!.Status);
        Assert.Contains("# Team memory", secondDone.Prompt);
        Assert.Contains("[correction] write-spec", secondDone.Prompt);

        // --- THE TRIGGER: a dev marks a story done → Quill wakes with a QA task ---
        var story = await PostOk<TaskResponse>(client, "/api/orgboard/tasks", new
        {
            teamId = team.Id,
            title = "Build the login screen",
            description = "Implements the approved spec.",
            type = "Story",
        });
        await PatchOk<TaskResponse>(client, $"/api/orgboard/tasks/{story.Id}/move", new { status = "Done" });

        var board = await client.GetFromJsonAsync<BoardResponse>($"/api/orgboard/board?teamId={team.Id}");
        var qaTask = Assert.Single(board!.Columns.SelectMany(c => c.Items), i => i.ParentId == story.Id);
        Assert.Equal("Test", qaTask.Type);
        Assert.StartsWith("QA:", qaTask.Title);
        Assert.Equal("Agent", qaTask.AssigneeKind); // assigned to Quill — humans and AI share one task model

        // Quill's run was dispatched by the trigger; drain it → the test plan waits in review.
        await DrainOneJob(factory);
        var pending = await client.GetFromJsonAsync<List<ReviewItemResponse>>(
            $"/api/governance/reviews?organizationId={owner.OrganizationId}");
        var quillHeld = Assert.Single(pending!, r => r.WorkItemId == qaTask.Id);
        Assert.Equal("write-test-plan", quillHeld.ActionKind);

        // Approve Quill's plan with a small edit → the second agent's edit distance is recorded.
        var quillApproved = await PostOk<ReviewItemResponse>(client, $"/api/governance/reviews/{quillHeld.Id}/approve", new
        {
            content = "Test plan: 1. logout ends the session. 2. protected routes redirect after logout.",
            childTitles = Array.Empty<string>(),
        });
        Assert.True(quillApproved.EditDistance > 0);

        // --- Guardrails: QA tasks never re-trigger; a story hands off at most once ---
        await PatchOk<TaskResponse>(client, $"/api/orgboard/tasks/{qaTask.Id}/move", new { status = "Done" });
        await PatchOk<TaskResponse>(client, $"/api/orgboard/tasks/{story.Id}/move", new { status = "InProgress" });
        await PatchOk<TaskResponse>(client, $"/api/orgboard/tasks/{story.Id}/move", new { status = "Done" });

        var after = await client.GetFromJsonAsync<BoardResponse>($"/api/orgboard/board?teamId={team.Id}");
        var allTasks = after!.Columns.SelectMany(c => c.Items).ToList();
        Assert.Single(allTasks, i => i.ParentId == story.Id);          // still exactly one handoff
        Assert.DoesNotContain(allTasks, i => i.ParentId == qaTask.Id); // QA's done never cascaded

        // --- ANALYTICS: the bet is measurable — edit distance + approval rate for Aria AND Quill ---
        var analytics = await client.GetFromJsonAsync<AnalyticsResponse>(
            $"/api/governance/analytics?organizationId={owner.OrganizationId}");
        Assert.True(analytics!.TasksDone >= 2);          // the story + the QA task
        Assert.Equal(2, analytics.Decided);
        Assert.Equal(2, analytics.Approved);
        Assert.Equal(1.0, analytics.ApprovalRate);
        Assert.True(analytics.AvgEditDistance > 0);
        Assert.Equal(1, analytics.PendingReviews);       // Aria's second (memory-aware) spec still waiting

        var aria = Assert.Single(analytics.Agents, a => a.Name == "Aria");
        var quill = Assert.Single(analytics.Agents, a => a.Name == "Quill");
        Assert.True(aria.AvgEditDistance > 0);
        Assert.True(quill.AvgEditDistance > 0);
        Assert.NotEmpty(aria.Trend);
        Assert.NotEmpty(quill.Trend);

        // The handoff itself is on the audit trail.
        var audit = await client.GetFromJsonAsync<List<AuditEntryResponse>>(
            $"/api/governance/audit?organizationId={owner.OrganizationId}&take=300");
        Assert.Contains(audit!, e => e.Action == "handoff.triggered" && e.EntityId == qaTask.Id);
    }

    private static async Task DrainOneJob(TeamUpWebFactory factory)
    {
        await using var scope = factory.Services.CreateAsyncScope();
        var queue = scope.ServiceProvider.GetRequiredService<JobQueue>();
        var job = await queue.ClaimNextAsync("test-worker");
        Assert.NotNull(job);
        await scope.ServiceProvider.GetRequiredService<AgentRunExecutor>().ProcessAsync(job!);
    }

    private static HttpClient Authed(TeamUpWebFactory factory, string token)
    {
        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
        client.DefaultRequestHeaders.Add("X-Skills-Admin-Key", TeamUpWebFactory.PlatformAdminKey);
        return client;
    }

    private static async Task<T> PostOk<T>(HttpClient client, string url, object body)
    {
        var response = await client.PostAsJsonAsync(url, body);
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        var value = await response.Content.ReadFromJsonAsync<T>();
        Assert.NotNull(value);
        return value!;
    }

    private static async Task<T> PatchOk<T>(HttpClient client, string url, object body)
    {
        var response = await client.PatchAsJsonAsync(url, body);
        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        var value = await response.Content.ReadFromJsonAsync<T>();
        Assert.NotNull(value);
        return value!;
    }

    private static string LocateSkillsDirectory()
    {
        var dir = new DirectoryInfo(AppContext.BaseDirectory);
        while (dir is not null && !File.Exists(Path.Combine(dir.FullName, "TeamUp.slnx")))
        {
            dir = dir.Parent;
        }

        Assert.NotNull(dir);
        return Path.Combine(dir!.FullName, "skills");
    }
}