using System.Text.Json;
using Microsoft.AspNetCore.Mvc;
using Server.WatchBody.Core.Dal.Src.Repository;
using Server.WatchBody.Web.Dto;

namespace Server.WatchBody.Web.Controllers;

/// <summary>GET api/v1/programs/active — активная версия программы (spec 05).</summary>
public class ProgramController : Controller
{
    private readonly IProgramRepository _programs;
    private readonly IProgramVersionRepository _versions;

    public ProgramController(IProgramRepository programs, IProgramVersionRepository versions)
    {
        _programs = programs;
        _versions = versions;
    }

    public ActionResult Active()
    {
        var athleteId = AthleteId();
        if (athleteId < 0) return Error(401, "unauthorized");

        var program = _programs.Select(athleteId).FirstOrDefault();
        var activeMeta = program == null
            ? null
            : _versions.Select(new ProgramVersionFilter
            {
                AthleteId = athleteId,
                ProgramId = program.Id,
                Status = "active",
            }).FirstOrDefault();
        if (program == null || activeMeta == null)
            return Error(404, "no_active_program");

        // body — отдельным get (program_version_select его не возвращает)
        var active = _versions.Get(athleteId, activeMeta.Id);
        if (active == null) return Error(404, "no_active_program");

        return new JsonResult(new ActiveProgramResponse
        {
            ProgramId = program.Id,
            VersionId = active.Id,
            Version = active.Version,
            BasedOnVersion = active.BasedOnVersion,
            Author = active.Author,
            Status = active.Status,
            Body = JsonDocument.Parse(active.Body).RootElement.Clone(),
            Rationale = active.Rationale,
            CreatedAt = active.CreatedAt,
        });
    }

    private int AthleteId() =>
        HttpContext.Items.TryGetValue(Middleware.ApiKeyMiddleware.AthleteIdItem, out var value)
            ? (int)value!
            : -1;

    private ActionResult Error(int statusCode, string message)
    {
        Response.StatusCode = statusCode;
        return new JsonResult(new ErrorResponse { Error = message });
    }
}