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Dhananjaya99
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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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