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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 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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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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""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
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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("currentWorkoutPlan"))
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throw new Exception("Current plan missing");
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string modification = 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 fitness AI.
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You will receive:
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1) The current workout plan in valid JSON format.
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2) A user modification request in free text.
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3) BMI, body shape, target, time period, continuous workout days, whether going to gym or not, injuries, any seriose conditions.
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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 workout days unless requested.
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- Do NOT modify exercises that are not mentioned in the request.
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- Do NOT rewrite descriptions unless necessary for the modification.
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- Do NOT change sets, reps, or rest periods unless the request requires it.
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- Do NOT add or remove exercises unless explicitly requested.
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- Do NOT modify workout structure that is unrelated to the request.
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- Preserve every unchanged value exactly as provided.
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- Analyze the user's BMI, body shape, target, time period, continuous workout days, gym access, injuries, and any seriose conditions.
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- Stricly focus if mentioned any seriose health conditions or injuries and do not suggest any exercise that can cause harm to the user.
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- If the modification request is not logical or contradicts fitness principles, do not apply it and explain why in the reason field.
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Scope control:
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If the request only affects one exercise, update only that exercise.
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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 workout 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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""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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""howToDo"": string,
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""doURL"": 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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""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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""howToDo"": string,
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""doURL"": 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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