using Seasoned.Backend.DTOs;
using Mscc.GenerativeAI;

namespace Seasoned.Backend.Services;

public class RecipeService : IRecipeService
{
    private readonly string _apiKey;

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

    public async Task<RecipeResponseDto> ParseRecipeImageAsync(IFormFile image)
    {
        var googleAI = new GoogleAI(_apiKey);
        // Using the 2.5 Flash model specifically
        var model = googleAI.GenerativeModel(Model.Gemini25Flash); 

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

        var prompt = "Extract this recipe. Provide a title and description.";

        // This structure ensures the 2.5 model receives both the text and the image correctly
        var request = new GenerateContentRequest
        {
            Contents = new List<Content>
            {
                new Content
                {
                    Role = Role.User,
                    Parts = new List<Part>
                    {
                        new TextPart { Text = prompt },
                        new InlineDataPart { MimeType = "image/png", Data = base64Image }
                    }
                }
            }
        };

        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>()
        };
    }
}