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chloe
2026-03-05 04:52:15 +00:00
parent a99a477985
commit 2bbbbc746f
15 changed files with 551 additions and 93 deletions
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57
Seasoned.Backend/Services/RecipeService.cs
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@@ -2,7 +2,8 @@ using Seasoned.Backend.DTOs;
using Mscc.GenerativeAI;
using Microsoft.AspNetCore.Http;
using System.IO;
using System.Text.Json;
using System.Text.Json.Serialization;
namespace Seasoned.Backend.Services;
public class RecipeService : IRecipeService
@@ -11,7 +12,7 @@ public class RecipeService : IRecipeService
public RecipeService(IConfiguration config)
{
_apiKey = config["GeminiApiKey"] ?? throw new ArgumentNullException("API Key missing");
_apiKey = config["GEMINI_API_KEY"] ?? throw new ArgumentNullException("API Key missing");
}
public async Task<RecipeResponseDto> ParseRecipeImageAsync(IFormFile image)
@@ -23,27 +24,55 @@ public class RecipeService : IRecipeService
await image.CopyToAsync(ms);
var base64Image = Convert.ToBase64String(ms.ToArray());
// 1. Better Prompt: Tell Gemini exactly what the JSON should look like
var prompt = @"Extract the recipe from this image.
Return a JSON object with exactly these fields:
var prompt = @"Extract the recipe details from this image.
IMPORTANT: Return ONLY a raw JSON string.
DO NOT include markdown formatting (no ```json).
DO NOT include any text before or after the JSON.
All property names and string values MUST be enclosed in double quotes.
JSON structure:
{
""title"": ""string"",
""description"": ""string"",
""ingredients"": [""string""],
""instructions"": [""string""]
""ingredients"": [""string"", ""string""],
""instructions"": [""string"", ""string""]
}";
// 2. Set the Response MIME Type to application/json
var config = new GenerationConfig { ResponseMimeType = "application/json" };
var config = new GenerationConfig {
ResponseMimeType = "application/json",
Temperature = 0.1f
};
var request = new GenerateContentRequest(prompt, config);
request.AddMedia(base64Image, "image/png");
await Task.Run(() => request.AddMedia(base64Image, "image/png"));
var response = await model.GenerateContent(request);
string rawText = response.Text?.Trim() ?? "";
// 3. Use System.Text.Json to turn that string back into our DTO
var options = new System.Text.Json.JsonSerializerOptions { PropertyNameCaseInsensitive = true };
var result = System.Text.Json.JsonSerializer.Deserialize<RecipeResponseDto>(response.Text, options);
int start = rawText.IndexOf('{');
int end = rawText.LastIndexOf('}');
return result ?? new RecipeResponseDto { Title = "Error parsing JSON" };
if (start == -1 || end == -1)
{
return new RecipeResponseDto { Title = "Error", Description = "AI failed to generate a valid JSON block." };
}
string cleanJson = rawText.Substring(start, (end - start) + 1);
try
{
var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
var result = JsonSerializer.Deserialize<RecipeResponseDto>(cleanJson, options);
return result ?? new RecipeResponseDto { Title = "Empty Response" };
}
catch (JsonException ex)
{
Console.WriteLine($"Raw AI Output: {rawText}");
Console.WriteLine($"Failed to parse JSON: {ex.Message}");
return new RecipeResponseDto {
Title = "Parsing Error",
Description = "The AI response was malformed. Check logs."
};
}
}
}