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("gemini-2.5-flash"); 

        using var ms = new MemoryStream();
        await image.CopyToAsync(ms);
        var base64Image = Convert.ToBase64String(ms.ToArray());

        var prompt = "Extract the recipe from this image. Return Title and Description.";
        
        // We create the request using 'dynamic' to skip the IPart/Part conversion errors
        var request = new GenerateContentRequest
        {
            Contents = new List<Content>
            {
                new Content
                {
                    Role = Role.User,
                    // We cast the list to dynamic so the compiler doesn't check the 'Part' types
                    Parts = (dynamic)new List<object>
                    {
                        new { text = prompt },
                        new { inline_data = new { mime_type = "image/png", data = base64Image } }
                    }
                }
            }
        };

        // Call the model with our 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>()
        };
    }
}