# main.py

from fastapi import FastAPI, File, UploadFile, HTTPException, Form
from fastapi.responses import JSONResponse
from pydantic import BaseModel
import librosa
import numpy as np
import tempfile
import os
import warnings
import re
import matplotlib.pyplot as plt

warnings.filterwarnings("ignore", category=UserWarning, module='librosa')

app = FastAPI()

def extract_audio_features(audio_file_path):
    # Load the audio file and extract features
    y, sr = librosa.load(audio_file_path, sr=None)
    f0, voiced_flag, voiced_probs = librosa.pyin(y, fmin=75, fmax=600)
    f0 = f0[~np.isnan(f0)]
    energy = librosa.feature.rms(y=y)[0]
    mfccs = librosa.feature.mfcc(y=y, sr=sr, n_mfcc=13)
    onset_env = librosa.onset.onset_strength(y=y, sr=sr)
    tempo, _ = librosa.beat.beat_track(onset_envelope=onset_env, sr=sr)
    speech_rate = tempo / 60
    return f0, energy, speech_rate, mfccs, y, sr

def analyze_voice_stress(audio_file_path):
    f0, energy, speech_rate, mfccs, y, sr = extract_audio_features(audio_file_path)
    mean_f0 = np.mean(f0)
    std_f0 = np.std(f0)
    mean_energy = np.mean(energy)
    std_energy = np.std(energy)
    gender = 'male' if mean_f0 < 165 else 'female'
    norm_mean_f0 = 110 if gender == 'male' else 220
    norm_std_f0 = 20
    norm_mean_energy = 0.02
    norm_std_energy = 0.005
    norm_speech_rate = 4.4
    norm_std_speech_rate = 0.5
    z_f0 = (mean_f0 - norm_mean_f0) / norm_std_f0
    z_energy = (mean_energy - norm_mean_energy) / norm_std_energy
    z_speech_rate = (speech_rate - norm_speech_rate) / norm_std_speech_rate
    stress_score = (0.4 * z_f0) + (0.4 * z_speech_rate) + (0.2 * z_energy)
    stress_level = float(1 / (1 + np.exp(-stress_score)) * 100)
    categories = ["Very Low Stress", "Low Stress", "Moderate Stress", "High Stress", "Very High Stress"]
    category_idx = min(int(stress_level / 20), 4)
    stress_category = categories[category_idx]
    return {"stress_level": stress_level, "category": stress_category, "gender": gender}

def analyze_text_stress(text: str):
    # Placeholder text stress analysis
    stress_keywords = ["anxious", "nervous", "stress", "panic", "tense"]
    stress_score = sum([1 for word in stress_keywords if word in text.lower()])
    
    # Normalize the score for a basic assessment
    stress_level = min(stress_score * 20, 100)
    categories = ["Very Low Stress", "Low Stress", "Moderate Stress", "High Stress", "Very High Stress"]
    category_idx = min(int(stress_level / 20), 4)
    stress_category = categories[category_idx]
    
    return {"stress_level": stress_level, "category": stress_category}

class StressResponse(BaseModel):
    stress_level: float
    category: str
    gender: str = None  # Optional, only for audio analysis

@app.post("/analyze-stress/", response_model=StressResponse)
async def analyze_stress(
    file: UploadFile = File(None), 
    file_path: str = Form(None),
    text: str = Form(None)
):
    if file is None and file_path is None and text is None:
        raise HTTPException(status_code=400, detail="Either a file, file path, or text input is required.")
    
    # Handle audio file analysis
    if file or file_path:
        if file:
            if not file.filename.endswith(".wav"):
                raise HTTPException(status_code=400, detail="Only .wav files are supported.")
            with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as temp_file:
                temp_file.write(await file.read())
                temp_file_path = temp_file.name
        else:
            if not file_path.endswith(".wav"):
                raise HTTPException(status_code=400, detail="Only .wav files are supported.")
            if not os.path.exists(file_path):
                raise HTTPException(status_code=400, detail="File path does not exist.")
            temp_file_path = file_path

        try:
            result = analyze_voice_stress(temp_file_path)
            return JSONResponse(content=result)
        except Exception as e:
            raise HTTPException(status_code=500, detail=str(e))
        finally:
            if file:
                os.remove(temp_file_path)

    # Handle text analysis
    elif text:
        result = analyze_text_stress(text)
        return JSONResponse(content=result)

if __name__ == "__main__":
    import uvicorn
    port = int(os.getenv("PORT", 8000))  # Use the PORT environment variable for Render compatibility
    uvicorn.run("main:app", host="0.0.0.0", port=port, reload=True)