using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;
using TeamUp.Modules.Assembler.Domain;
using TeamUp.Modules.Assembler.Persistence;
using TeamUp.SharedKernel.Ai;
using TeamUp.SharedKernel.Modularity;

namespace TeamUp.Modules.Assembler.Endpoints;

internal static class AssemblerEndpoints
{
    public static void Map(IEndpointRouteBuilder endpoints)
    {
        var group = endpoints.MapGroup("/api/assembler").WithTags("Assembler");

        group.MapGet("/ping", () => TypedResults.Ok(new ModulePing("assembler")));
        group.MapPost("/runs", CreateRun).RequireAuthorization();
        group.MapGet("/runs/{id:guid}", GetRun).RequireAuthorization();
        group.MapGet("/agent-activity", GetAgentActivity).RequireAuthorization();
    }

    // The live pulse behind each agent's face: the latest run status per agent. The client passes the
    // ids of the AI seats it is showing (it already holds them) and composes the on-screen face state —
    // this keeps the module boundary clean (Assembler owns runs; it never reaches into seats/teams).
    private static async Task<IResult> GetAgentActivity(
        string? agentIds, AssemblerDbContext db, CancellationToken ct)
    {
        var ids = (agentIds ?? string.Empty)
            .Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)
            .Select(s => Guid.TryParse(s, out var g) ? g : (Guid?)null)
            .Where(g => g.HasValue)
            .Select(g => g!.Value)
            .Distinct()
            .ToList();

        if (ids.Count == 0)
        {
            return Results.Ok(Array.Empty<AgentActivityResponse>());
        }

        // Latest run per agent. Project the few columns we need, then pick the newest per agent in
        // memory — at dogfood scale this is a small set and avoids brittle GroupBy translation.
        var runs = await db.AgentRuns
            .Where(r => r.AgentId != null && ids.Contains(r.AgentId!.Value))
            .Select(r => new
            {
                AgentId = r.AgentId!.Value,
                r.Status,
                r.WorkItemId,
                r.CreatedAtUtc,
                r.CompletedAtUtc,
            })
            .ToListAsync(ct);

        var activity = runs
            .GroupBy(r => r.AgentId)
            .Select(g => g.OrderByDescending(r => r.CreatedAtUtc).First())
            .Select(r => new AgentActivityResponse(
                r.AgentId,
                r.Status.ToString(),
                r.WorkItemId,
                r.CompletedAtUtc ?? r.CreatedAtUtc))
            .ToList();

        return Results.Ok(activity);
    }

    // Dispatch a task to an AI seat: record a queued AgentRun and enqueue the job. The worker
    // drains it off the request path. Shares AgentRunDispatcher with the board triggers.
    private static async Task<IResult> CreateRun(
        CreateRunRequest request, IAgentDispatcher dispatcher, AssemblerDbContext db, CancellationToken ct)
    {
        var runId = await dispatcher.DispatchAsync(request.SeatId, request.WorkItemId, ct);
        var run = await db.AgentRuns.FirstAsync(r => r.Id == runId, ct);
        return Results.Ok(ToResponse(run));
    }

    private static async Task<IResult> GetRun(Guid id, AssemblerDbContext db, CancellationToken ct)
    {
        var run = await db.AgentRuns.FirstOrDefaultAsync(r => r.Id == id, ct);
        return run is null ? Results.NotFound() : Results.Ok(ToResponse(run));
    }

    private static RunResponse ToResponse(AgentRun run) => new(
        run.Id, run.SeatId, run.WorkItemId, run.AgentId, run.Status.ToString(),
        run.ActionType, run.ActionRisk, run.Prompt, run.Output, run.Error,
        run.Trace, run.ResultJson, run.LatencyMs, run.CreatedAtUtc, run.CompletedAtUtc);
}