using Seasoned.Backend.DTOs;
using Mscc.GenerativeAI;
using Microsoft.AspNetCore.Http;
using System.IO;

namespace Seasoned.Backend.Services;

public class RecipeService : IRecipeService
{
    private readonly string _apiKey;

    public RecipeService(IConfiguration config)
    {
        _apiKey = config["GeminiApiKey"] ?? throw new ArgumentNullException("API Key missing");
    }

    public async Task<RecipeResponseDto> ParseRecipeImageAsync(IFormFile image)
    {
        var googleAI = new GoogleAI(_apiKey);
        var model = googleAI.GenerativeModel(Model.Gemini25Flash); 

        using var ms = new MemoryStream();
        await image.CopyToAsync(ms);
        var imageBytes = ms.ToArray();

        var prompt = "Extract the recipe from this image. Return Title and Description.";
        
        // 1. Create the request with just the text prompt first
        var request = new GenerateContentRequest(prompt);

        // 2. Use the built-in AddMedia helper. 
        // This automatically handles the IPart/InlineData wrapping for you!
        request.AddMedia(imageBytes, "image/png");

        // 3. Send the request
        var response = await model.GenerateContent(request);

        return new RecipeResponseDto
        {
            Title = "Gemini 2.5 Analysis",
            Description = response.Text ?? "No text returned",
            Ingredients = new List<string>(),
            Instructions = new List<string>()
        };
    }
}