namespace Health.WebApi.Endpoints;

public static class DietEndpoints
{
    public static void MapDietEndpoints(this WebApplication app)
    {
        var group = app.MapGroup("/api/diet-records").RequireAuthorization();

        group.MapGet("/", async (string? date, string? mealType, HttpContext http, AppDbContext db, CancellationToken ct) =>
        {
            var userId = GetUserId(http);
            var query = db.DietRecords.Include(d => d.FoodItems).Where(d => d.UserId == userId);
            if (DateOnly.TryParse(date, out var d)) query = query.Where(r => r.RecordedAt == d);
            if (Enum.TryParse<MealType>(mealType, ignoreCase: true, out var mt)) query = query.Where(r => r.MealType == mt);
            var records = await query.OrderByDescending(r => r.RecordedAt).ToListAsync(ct);
            return Results.Ok(new { code = 0, data = records, message = (string?)null });
        });

        group.MapPost("/", async (CreateDietRequest req, HttpContext http, AppDbContext db, CancellationToken ct) =>
        {
            var userId = GetUserId(http);
            var record = new DietRecord
            {
                Id = Guid.NewGuid(), UserId = userId, MealType = req.MealType,
                TotalCalories = req.TotalCalories, HealthScore = req.HealthScore, RecordedAt = req.RecordedAt ?? DateOnly.FromDateTime(DateTime.Now),
            };
            if (req.FoodItems != null)
                foreach (var fi in req.FoodItems)
                    record.FoodItems.Add(new DietFoodItem { Id = Guid.NewGuid(), Name = fi.Name, Portion = fi.Portion, Calories = fi.Calories, ProteinGrams = fi.ProteinGrams, CarbsGrams = fi.CarbsGrams, FatGrams = fi.FatGrams, Warning = fi.Warning, SortOrder = fi.SortOrder });
            db.DietRecords.Add(record);
            await db.SaveChangesAsync(ct);
            return Results.Ok(new { code = 0, data = new { record.Id }, message = (string?)null });
        });

        group.MapDelete("/{id:guid}", async (Guid id, HttpContext http, AppDbContext db, CancellationToken ct) =>
        {
            var userId = GetUserId(http);
            var record = await db.DietRecords.FirstOrDefaultAsync(r => r.Id == id && r.UserId == userId, ct);
            if (record != null) { db.DietRecords.Remove(record); await db.SaveChangesAsync(ct); }
            return Results.Ok(new { code = 0, data = new { success = true }, message = (string?)null });
        });
    }

    private static Guid GetUserId(HttpContext http) =>
        Guid.TryParse(http.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value, out var id) ? id : Guid.Empty;
}

public sealed record CreateDietRequest(MealType MealType, int? TotalCalories, int? HealthScore, DateOnly? RecordedAt, List<FoodItemDto>? FoodItems);
public sealed record FoodItemDto(string Name, string? Portion, int? Calories, decimal? ProteinGrams, decimal? CarbsGrams, decimal? FatGrams, string? Warning, int SortOrder);