78 lines
2.7 KiB
C#
78 lines
2.7 KiB
C#
using Seasoned.Backend.DTOs;
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using Mscc.GenerativeAI;
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using Microsoft.AspNetCore.Http;
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using System.IO;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace Seasoned.Backend.Services;
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public class RecipeService : IRecipeService
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{
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private readonly string _apiKey;
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public RecipeService(IConfiguration config)
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{
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_apiKey = config["GEMINI_API_KEY"] ?? throw new ArgumentNullException("API Key missing");
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}
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public async Task<RecipeResponseDto> ParseRecipeImageAsync(IFormFile image)
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{
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var googleAI = new GoogleAI(_apiKey);
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var model = googleAI.GenerativeModel("gemini-3.1-flash-lite-preview");
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using var ms = new MemoryStream();
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await image.CopyToAsync(ms);
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var base64Image = Convert.ToBase64String(ms.ToArray());
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var prompt = @"Extract the recipe details from this image.
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IMPORTANT: Return ONLY a raw JSON string.
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DO NOT include markdown formatting (no ```json).
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DO NOT include any text before or after the JSON.
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All property names and string values MUST be enclosed in double quotes.
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JSON structure:
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{
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""title"": ""string"",
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""description"": ""string"",
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""ingredients"": [""string"", ""string""],
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""instructions"": [""string"", ""string""]
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}";
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var config = new GenerationConfig {
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ResponseMimeType = "application/json",
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Temperature = 0.1f
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};
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var request = new GenerateContentRequest(prompt, config);
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await Task.Run(() => request.AddMedia(base64Image, "image/png"));
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var response = await model.GenerateContent(request);
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string rawText = response.Text?.Trim() ?? "";
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int start = rawText.IndexOf('{');
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int end = rawText.LastIndexOf('}');
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if (start == -1 || end == -1)
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{
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return new RecipeResponseDto { Title = "Error", Description = "AI failed to generate a valid JSON block." };
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}
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string cleanJson = rawText.Substring(start, (end - start) + 1);
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try
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{
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var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
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var result = JsonSerializer.Deserialize<RecipeResponseDto>(cleanJson, options);
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return result ?? new RecipeResponseDto { Title = "Empty Response" };
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}
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catch (JsonException ex)
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{
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Console.WriteLine($"Raw AI Output: {rawText}");
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Console.WriteLine($"Failed to parse JSON: {ex.Message}");
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return new RecipeResponseDto {
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Title = "Parsing Error",
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Description = "The AI response was malformed. Check logs."
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};
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}
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}
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} |