using GerbilManagerWebAPI.Dtos;
using GerbilManagerWebAPI.Models;
using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.EntityFrameworkCore;

namespace GerbilManagerWebAPI.Endpoints
{
    /// <summary>
    /// FEEDBACK: the "Fehler melden" report sink.
    ///   POST /feedback  -> persist a user bug report (with captured debug context), returns 201.
    ///   GET  /feedback  -> list reports, newest first (for later review).
    /// Feedback is decoupled from gerbils/litters (loose nullable Guid columns, no FK), so
    /// rows survive the import re-ingest wipe.
    /// </summary>
    public static class FeedbackEndpoints
    {
        public static IEndpointRouteBuilder MapFeedbackEndpoints(this IEndpointRouteBuilder app)
        {
            var group = app.MapGroup("/feedback").WithTags("Feedback");

            group.MapPost("/", async Task<Results<Created<FeedbackDto>, BadRequest<string>>> (
                FeedbackInput input, ApplicationContext db, HttpContext http) =>
            {
                if (string.IsNullOrWhiteSpace(input.Message))
                    return TypedResults.BadRequest("Message darf nicht leer sein.");

                var entity = new Feedback
                {
                    Id = Guid.NewGuid(),
                    Message = input.Message.Trim(),
                    Context = string.IsNullOrWhiteSpace(input.Context) ? "unknown" : input.Context.Trim(),
                    GerbilId = input.GerbilId,
                    LitterId = input.LitterId,
                    EntityName = input.EntityName,
                    Url = input.Url,
                    ClientTimestamp = input.ClientTimestamp,
                    UserAgent = http.Request.Headers.UserAgent.ToString() is { Length: > 0 } ua ? ua : null,
                    CreatedAt = DateTimeOffset.UtcNow,
                };
                db.Feedback.Add(entity);
                await db.SaveChangesAsync();
                return TypedResults.Created($"/feedback/{entity.Id}", ToDto(entity));
            });

            group.MapGet("/", async (ApplicationContext db) =>
            {
                // Order in memory: SQLite (test host) cannot ORDER BY a DateTimeOffset column.
                var rows = await db.Feedback.AsNoTracking().ToListAsync();
                return TypedResults.Ok(rows
                    .OrderByDescending(f => f.CreatedAt)
                    .Select(ToDto)
                    .ToList());
            });

            return app;
        }

        private static FeedbackDto ToDto(Feedback f) =>
            new(f.Id, f.Message, f.Context, f.GerbilId, f.LitterId, f.EntityName, f.Url,
                f.ClientTimestamp, f.UserAgent, f.CreatedAt);
    }
}