first commit
This commit is contained in:
Dhananjaya99
@@ -0,0 +1,68 @@
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using System.Text.Json;
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namespace Fitness_core_BE.AI
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{
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public class GeminiClient : IAiClient
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{
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private readonly HttpClient _http;
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private readonly IConfiguration _config;
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public GeminiClient(HttpClient http, IConfiguration configuration)
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{
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_http = http;
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_config = configuration;
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}
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public async Task<string> GenerateJsonAsync( string systemPrompt, object payload)
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{
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string apiKey = _config["Gemini:ApiKey"];
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if (string.IsNullOrEmpty(apiKey))
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throw new Exception("Gemini API key is not configured.");
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var requestBody = new
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{
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contents = new[]
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{
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new
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{
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parts = new[]
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{
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new { text = systemPrompt },
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new { text = JsonSerializer.Serialize(payload) }
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}
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}
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},
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generationConfig = new
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{
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temperature = 0.4,
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maxOutputTokens = 10000
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}
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};
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var response = await _http.PostAsJsonAsync(
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$"https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent?key={apiKey}",
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requestBody
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);
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if (!response.IsSuccessStatusCode)
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{
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var error = await response.Content.ReadAsStringAsync();
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throw new Exception($"Gemini API Error: {error}");
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}
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var jsonString = await response.Content.ReadAsStringAsync();
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using var doc = JsonDocument.Parse(jsonString);
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var text = doc.RootElement
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.GetProperty("candidates")[0]
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.GetProperty("content")
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.GetProperty("parts")[0]
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.GetProperty("text")
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.GetString();
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return text ?? throw new Exception("No response text from Gemini.");
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}
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}
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}
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@@ -0,0 +1,7 @@
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namespace Fitness_core_BE.AI
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{
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public interface IAiClient
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{
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Task<string> GenerateJsonAsync(string systemPrompt, object payload);
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}
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}
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@@ -0,0 +1,213 @@
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using Fitness_core_BE.Helpers;
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using System.Text.Json;
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namespace Fitness_core_BE.AI
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{
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public class MealPlanOrchestrator
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{
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private readonly IAiClient _aiClient;
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private readonly ModificationGuard _guard;
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public MealPlanOrchestrator( IAiClient aiClient, ModificationGuard guard)
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{
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_aiClient = aiClient;
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_guard = guard;
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}
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public async Task<object> GeneratePlanAsync(object payload)
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{
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var data = DeserializePayload.Deserialize(payload);
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decimal bmi = DataExtractor.GetRequiredDecimal(data, "bmi");
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string country = DataExtractor.GetRequiredString(data, "country");
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string province = DataExtractor.GetRequiredString(data, "province");
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string goal = DataExtractor.GetRequiredString(data, "goal");
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decimal budget = DataExtractor.GetRequiredDecimal(data, "budgetPerWeek");
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int mealsPerDay = DataExtractor.GetRequiredInt(data, "mealsPerDay");
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bool isVegetarian = DataExtractor.GetRequiredBool(data, "isVegetarian");
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// Basic validation
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if (bmi < 10 || bmi > 60)
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throw new Exception("Invalid BMI");
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var systemPrompt = @"
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You are a certified nutritionist.
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Your response must be STRICTLY a JSON object.
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Output format rules:
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1. The first character of your response MUST be {
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2. The last character MUST be }
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3. Do not include ``` or any markdown formatting
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4. Do not include any explanation text
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5. Do not include comments
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6. Do not prefix with ""Here is""
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7. Do not suffix with any text
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Return ONLY valid JSON.
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Structure:
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{
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name: string,
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description: string,
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mealItems: [
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{
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name: string,
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description: string,
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calories: number,
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protein: number,
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carbohydrates: number,
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fats: number,
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servingSize: string,
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mealItems: [
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{ food: string, quantity: string }
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],
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preparationNotes: string
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}
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]
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}
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";
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var jsonResponse = await _aiClient.GenerateJsonAsync(
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systemPrompt,
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data
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);
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// Validate JSON before returning
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try
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{
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var parsed = JsonSerializer.Deserialize<object>(jsonResponse);
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if (parsed == null)
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throw new Exception("Invalid AI JSON");
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}
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catch
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{
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throw new Exception("AI returned invalid JSON structure");
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}
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return JsonSerializer.Deserialize<object>(jsonResponse)!;
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}
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public async Task<object> UpdatePlanAsync(object payload)
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{
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var data = DeserializePayload.Deserialize(payload);
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if (!data.ContainsKey("currentPlan"))
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throw new Exception("Current plan missing");
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string modification =
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DataExtractor.GetRequiredString(data, "modification");
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_guard.Validate(modification);
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var systemPrompt = @"
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You are a professional nutrition AI.
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You will receive:
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1) The current meal plan in valid JSON format.
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2) A user modification request in free text.
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Your task:
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- Carefully analyze the modification request.
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- Modify ONLY the specific elements explicitly requested by the user.
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- Do NOT change anything else.
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VERY IMPORTANT RULES:
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- Do NOT change the plan name unless the user explicitly asks.
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- Do NOT change the number of meals unless requested.
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- Do NOT modify calories, protein, carbs, fats unless the request requires it.
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- Do NOT rewrite descriptions unless necessary for the modification.
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- Do NOT change serving sizes unless required.
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- Do NOT add or remove meals unless explicitly requested.
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- Do NOT modify ingredients that are unrelated to the request.
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- Preserve every unchanged value exactly as provided.
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Scope control:
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If the request only affects one ingredient, update only that ingredient.
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If the request does not affect the plan, return it unchanged.
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Preserve the exact internal structure of the meal plan.
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Do NOT rename fields.
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Do NOT remove required properties.
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Do NOT change the JSON schema.
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Return your response strictly in this JSON format:
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{
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""reason"": string,
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""modified"": boolean,
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""currentPlan"": {
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""name"": string,
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""description"": string,
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""mealItems"": [
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{
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""name"": string,
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""description"": string,
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""calories"": number,
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""protein"": number,
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""carbohydrates"": number,
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""fats"": number,
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""servingSize"": string,
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""mealItems"": [
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{ ""food"": string, ""quantity"": string }
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],
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""preparationNotes"": string
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}
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]
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},
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""updatedPlan"": {
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""name"": string,
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""description"": string,
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""mealItems"": [
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{
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""name"": string,
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""description"": string,
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""calories"": number,
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""protein"": number,
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""carbohydrates"": number,
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""fats"": number,
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""servingSize"": string,
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""mealItems"": [
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{ ""food"": string, ""quantity"": string }
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],
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""preparationNotes"": string
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}
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]
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}
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}
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STRICT OUTPUT RULES:
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- Return ONLY valid raw JSON.
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- No markdown.
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- No explanations.
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- First character must be {.
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- Last character must be }.
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- No trailing commas.
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- No extra commentary.
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If modification cannot be applied:
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- Set ""modified"": false
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- Keep currentPlan and updatedPlan identical.
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- Explain reason clearly.
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";
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var jsonResponse = await _aiClient.GenerateJsonAsync(
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systemPrompt,
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data
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);
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try
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{
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var parsed = JsonSerializer.Deserialize<object>(jsonResponse);
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if (parsed == null)
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throw new Exception("Invalid JSON");
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}
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catch
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{
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throw new Exception("AI returned invalid JSON");
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}
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return JsonSerializer.Deserialize<object>(jsonResponse)!;
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}
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}
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}
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@@ -0,0 +1,47 @@
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namespace Fitness_core_BE.AI
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{
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public class ModificationGuard
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{
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private static readonly string[] AllowedKeywords =
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{
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"replace",
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"remove",
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"allergy",
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"change",
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"vegetarian",
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"calorie",
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"protein",
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"carb",
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"fat",
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"meal",
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"ingredient"
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};
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private static readonly string[] BlockedPatterns =
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{
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"ignore previous instructions",
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"system prompt",
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"act as",
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"bypass",
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"developer mode",
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"jailbreak"
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};
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public void Validate(string message)
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{
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if (string.IsNullOrWhiteSpace(message))
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throw new Exception("Modification cannot be empty.");
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if (message.Length > 500)
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throw new Exception("Modification too long.");
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var lower = message.ToLower();
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if (BlockedPatterns.Any(p => lower.Contains(p)))
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throw new Exception("Invalid modification request.");
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//if (!AllowedKeywords.Any(k => lower.Contains(k)))
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// throw new Exception("Only meal plan modifications are allowed.");
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}
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}
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}
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@@ -0,0 +1,229 @@
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using Fitness_core_BE.Helpers;
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using System.Text.Json;
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namespace Fitness_core_BE.AI
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{
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public class WorkoutPlanOrchestrator
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{
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private readonly IAiClient _aiClient;
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private readonly ModificationGuard _guard;
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public WorkoutPlanOrchestrator(IAiClient aiClient, ModificationGuard guard)
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{
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_aiClient = aiClient;
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_guard = guard;
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}
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public async Task<object> GeneratePlanAsync(object payload)
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{
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var data = DeserializePayload.Deserialize(payload);
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string fitnessLevel = DataExtractor.GetRequiredString(data, "fitnessLevel");
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string goal = DataExtractor.GetRequiredString(data, "goal");
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int daysPerWeek = DataExtractor.GetRequiredInt(data, "daysPerWeek");
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string availableEquipment = DataExtractor.GetRequiredString(data, "availableEquipment");
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int durationMinutes = DataExtractor.GetRequiredInt(data, "durationPerSession");
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// Optional fields
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string? injuryOrLimitations = data.ContainsKey("injuryOrLimitations")
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? data["injuryOrLimitations"].GetString()
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: null;
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// Basic validation
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if (daysPerWeek < 1 || daysPerWeek > 7)
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throw new Exception("Days per week must be between 1 and 7");
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if (durationMinutes < 15 || durationMinutes > 180)
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throw new Exception("Duration must be between 15 and 180 minutes");
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//bmi, body shape , target , should check with tartget and body shape matching, time peiod, Continuose-week days,,, whether going to Gym or not, Injuries, any seriose conditions,
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var systemPrompt = @"
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You are a certified personal trainer and fitness expert.
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Your response must be STRICTLY a JSON object.
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|
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Output format rules:
|
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1. The first character of your response MUST be {
|
||||
2. The last character MUST be }
|
||||
3. Do not include ``` or any markdown formatting
|
||||
4. Do not include any explanation text
|
||||
5. Do not include comments
|
||||
6. Do not prefix with ""Here is""
|
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7. Do not suffix with any text
|
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|
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Return ONLY valid JSON.
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|
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Structure:
|
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{
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""name"": string,
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""description"": string,
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""workoutItems"": [
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{
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""exerciseDay"": string,
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""description"": string,
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""exercises"": {
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""Exercise Name"": ""sets x reps or duration""
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},
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""duration"": string (total session time including warmup and cooldown, with units),
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""wormUp"": string (warmup instructions with an explicit time and unit),
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""cooldown"": string (cooldown instructions with an explicit time and unit),
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""howToDo"": string (JSON string with rest periods and notes),
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""doURL"": string (exercise reference URL)
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}
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]
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}
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Important guidelines:
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- Create a workout plan based on the user's fitness level, goal, and available equipment
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- Include appropriate exercises for the specified number of days per week
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- Each workout must fit within the specified duration
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- Set ""duration"" to the requested total duration per session (for example, ""45 minutes"")
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- ""wormUp"" and ""cooldown"" must each include an explicit duration such as ""5 minutes""
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- The main workout time plus wormUp time plus cooldown time must equal the total ""duration""
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- The ""exercises"" field should be an object with exercise names as keys and sets/reps as values
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- The ""howToDo"" field should be a JSON string containing warmup, rest periods, and notes
|
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- Consider any injury or limitations mentioned
|
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- Provide realistic sets, reps, and rest periods based on fitness level
|
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- Include proper progression and variety
|
||||
";
|
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|
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var jsonResponse = await _aiClient.GenerateJsonAsync(
|
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systemPrompt,
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data
|
||||
);
|
||||
|
||||
// Validate JSON before returning
|
||||
try
|
||||
{
|
||||
var parsed = JsonSerializer.Deserialize<object>(jsonResponse);
|
||||
if (parsed == null)
|
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throw new Exception("Invalid AI JSON");
|
||||
}
|
||||
catch
|
||||
{
|
||||
throw new Exception("AI returned invalid JSON structure");
|
||||
}
|
||||
|
||||
return JsonSerializer.Deserialize<object>(jsonResponse)!;
|
||||
}
|
||||
|
||||
public async Task<object> UpdatePlanAsync(object payload)
|
||||
{
|
||||
var data = DeserializePayload.Deserialize(payload);
|
||||
|
||||
if (!data.ContainsKey("currentWorkoutPlan"))
|
||||
throw new Exception("Current plan missing");
|
||||
|
||||
string modification = DataExtractor.GetRequiredString(data, "modification");
|
||||
|
||||
_guard.Validate(modification);
|
||||
|
||||
var systemPrompt = @"
|
||||
You are a professional fitness AI.
|
||||
|
||||
You will receive:
|
||||
1) The current workout plan in valid JSON format.
|
||||
2) A user modification request in free text.
|
||||
3) BMI, body shape, target, time period, continuous workout days, whether going to gym or not, injuries, any seriose conditions.
|
||||
|
||||
Your task:
|
||||
- Carefully analyze the modification request.
|
||||
- Modify ONLY the specific elements explicitly requested by the user.
|
||||
- Do NOT change anything else.
|
||||
|
||||
VERY IMPORTANT RULES:
|
||||
- Do NOT change the plan name unless the user explicitly asks.
|
||||
- Do NOT change the number of workout days unless requested.
|
||||
- Do NOT modify exercises that are not mentioned in the request.
|
||||
- Do NOT rewrite descriptions unless necessary for the modification.
|
||||
- Do NOT change sets, reps, or rest periods unless the request requires it.
|
||||
- Do NOT add or remove exercises unless explicitly requested.
|
||||
- Do NOT modify workout structure that is unrelated to the request.
|
||||
- Preserve every unchanged value exactly as provided.
|
||||
- Analyze the user's BMI, body shape, target, time period, continuous workout days, gym access, injuries, and any seriose conditions.
|
||||
- Stricly focus if mentioned any seriose health conditions or injuries and do not suggest any exercise that can cause harm to the user.
|
||||
- If the modification request is not logical or contradicts fitness principles, do not apply it and explain why in the reason field.
|
||||
|
||||
|
||||
Scope control:
|
||||
If the request only affects one exercise, update only that exercise.
|
||||
If the request does not affect the plan, return it unchanged.
|
||||
|
||||
Preserve the exact internal structure of the workout plan.
|
||||
Do NOT rename fields.
|
||||
Do NOT remove required properties.
|
||||
Do NOT change the JSON schema.
|
||||
|
||||
Return your response strictly in this JSON format:
|
||||
|
||||
{
|
||||
""reason"": string,
|
||||
""modified"": boolean,
|
||||
""currentPlan"": {
|
||||
""name"": string,
|
||||
""description"": string,
|
||||
""workoutItems"": [
|
||||
{
|
||||
""exerciseDay"": string,
|
||||
""description"": string,
|
||||
""exercises"": {
|
||||
""Exercise Name"": ""sets x reps or duration""
|
||||
},
|
||||
""howToDo"": string,
|
||||
""doURL"": string
|
||||
}
|
||||
]
|
||||
},
|
||||
""updatedPlan"": {
|
||||
""name"": string,
|
||||
""description"": string,
|
||||
""workoutItems"": [
|
||||
{
|
||||
""exerciseDay"": string,
|
||||
""description"": string,
|
||||
""exercises"": {
|
||||
""Exercise Name"": ""sets x reps or duration""
|
||||
},
|
||||
""howToDo"": string,
|
||||
""doURL"": string
|
||||
}
|
||||
]
|
||||
}
|
||||
}
|
||||
|
||||
STRICT OUTPUT RULES:
|
||||
- Return ONLY valid raw JSON.
|
||||
- No markdown.
|
||||
- No explanations.
|
||||
- First character must be {.
|
||||
- Last character must be }.
|
||||
- No trailing commas.
|
||||
- No extra commentary.
|
||||
|
||||
If modification cannot be applied:
|
||||
- Set ""modified"": false
|
||||
- Keep currentPlan and updatedPlan identical.
|
||||
- Explain reason clearly.
|
||||
";
|
||||
|
||||
var jsonResponse = await _aiClient.GenerateJsonAsync(
|
||||
systemPrompt,
|
||||
data
|
||||
);
|
||||
|
||||
try
|
||||
{
|
||||
var parsed = JsonSerializer.Deserialize<object>(jsonResponse);
|
||||
if (parsed == null)
|
||||
throw new Exception("Invalid JSON");
|
||||
}
|
||||
catch
|
||||
{
|
||||
throw new Exception("AI returned invalid JSON");
|
||||
}
|
||||
|
||||
return JsonSerializer.Deserialize<object>(jsonResponse)!;
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user