import os
import requests
import cv2
import re
import pytesseract
from flask import Flask, request, jsonify, render_template
from deepgram import DeepgramClient, PrerecordedOptions
from dotenv import load_dotenv
import tempfile
import json
import subprocess
import warnings

warnings.filterwarnings("ignore", message="FP16 is not supported on CPU; using FP32 instead")

app = Flask(__name__)
print("APP IS RUNNING, ANIKET")

# Load the .env file
load_dotenv()

print("ENV LOADED, ANIKET")

# Fetch the API key from the .env file
API_KEY = os.getenv("FIRST_API_KEY")
DEEPGRAM_API_KEY = os.getenv("SECOND_API_KEY")

# Ensure the API key is loaded correctly
if not API_KEY:
    raise ValueError("API Key not found. Make sure it is set in the .env file.")

if not DEEPGRAM_API_KEY:
    raise ValueError("DEEPGRAM_API_KEY not found. Make sure it is set in the .env file.")

GEMINI_API_ENDPOINT = "https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash-latest:generateContent"
GEMINI_API_KEY = API_KEY

@app.route("/", methods=["GET"])
def health_check():
    return jsonify({"status": "success", "message": "API is running successfully!"}), 200


def transcribe_audio(wav_file_path):
    """
    Transcribe audio from a video file using Deepgram API synchronously.
    
    Args:
        wav_file_path (str): Path to save the converted WAV file.
    Returns:
        dict: A dictionary containing status, transcript, or error message.
    """
    print("Entered the transcribe_audio function")
    try:
        # Initialize Deepgram client
        deepgram = DeepgramClient(DEEPGRAM_API_KEY)

        # Open the converted WAV file
        with open(wav_file_path, 'rb') as buffer_data:
            payload = {'buffer': buffer_data}

            # Configure transcription options
            options = PrerecordedOptions(
                smart_format=True, model="nova-2", language="en-US"
            )

            # Transcribe the audio
            response = deepgram.listen.prerecorded.v('1').transcribe_file(payload, options)

            # Check if the response is valid
            if response:
                try:
                    data_str = response.to_json(indent=4)
                except AttributeError as e:
                    return {"status": "error", "message": f"Error converting response to JSON: {e}"}

                # Parse the JSON string to a Python dictionary
                try:
                    data = json.loads(data_str)
                except json.JSONDecodeError as e:
                    return {"status": "error", "message": f"Error parsing JSON string: {e}"}

                # Extract the transcript
                try:
                    transcript = data["results"]["channels"][0]["alternatives"][0]["transcript"]
                except KeyError as e:
                    return {"status": "error", "message": f"Error extracting transcript: {e}"}

                print(f"Transcript obtained: {transcript}")
                # Save the transcript to a text file
                transcript_file_path = "transcript_from_transcribe_audio.txt"
                with open(transcript_file_path, "w", encoding="utf-8") as transcript_file:
                    transcript_file.write(transcript)
                
                return transcript
            else:
                return {"status": "error", "message": "Invalid response from Deepgram."}

    except FileNotFoundError:
        return {"status": "error", "message": f"Video file not found: {wav_file_path}"}
    except Exception as e:
        return {"status": "error", "message": f"Unexpected error: {e}"}
    finally:
        # Clean up the temporary WAV file
        if os.path.exists(wav_file_path):
            os.remove(wav_file_path)
            print(f"Temporary WAV file deleted: {wav_file_path}")


def download_video(url, temp_video_path):
    """Download video (MP4 format) from the given URL and save it to temp_video_path."""
    response = requests.get(url, stream=True)
    if response.status_code == 200:
        with open(temp_video_path, 'wb') as f:
            for chunk in response.iter_content(chunk_size=1024):
                f.write(chunk)
        print(f"Audio downloaded successfully to {temp_video_path}")
    else:
        raise Exception(f"Failed to download audio, status code: {response.status_code}")


def preprocess_frame(frame):
    """Preprocess the frame for better OCR accuracy."""
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    denoised = cv2.medianBlur(gray, 3)
    _, thresh = cv2.threshold(denoised, 0, 255, cv2.THRESH_BINARY | cv2.THRESH_OTSU)
    return thresh

def clean_ocr_text(text):
    """Clean the OCR output by removing noise and unwanted characters.""" 
    cleaned_text = re.sub(r'[^A-Za-z0-9\s,.!?-]', '', text)
    cleaned_text = '\n'.join([line.strip() for line in cleaned_text.splitlines() if len(line.strip()) > 2])
    return cleaned_text

def get_information_from_video_using_OCR(video_path, interval=1):
    """Extract text from video frames using OCR and return the combined text content."""
    cap = cv2.VideoCapture(video_path)
    fps = int(cap.get(cv2.CAP_PROP_FPS))
    frame_interval = interval * fps
    frame_count = 0
    extracted_text = ""

    print("Starting text extraction from video...")

    while cap.isOpened():
        ret, frame = cap.read()
        if not ret:
            break

        if frame_count % frame_interval == 0:
            preprocessed_frame = preprocess_frame(frame)
            text = pytesseract.image_to_string(preprocessed_frame, lang='eng', config='--psm 6 --oem 3')
            cleaned_text = clean_ocr_text(text)
            if cleaned_text:
                extracted_text += cleaned_text + "\n\n"
                print(f"Text found at frame {frame_count}: {cleaned_text[:50]}...")

        frame_count += 1

    cap.release()
    print("Text extraction completed.")
    return extracted_text


def convert_mp4_to_wav(mp4_path, wav_path):
    """Convert an MP4 file to a WAV file."""
    command = f"ffmpeg -i {mp4_path} -vn -acodec pcm_s16le -ar 44100 -ac 2 {wav_path}"
    subprocess.run(command, shell=True, check=True)
    print(f"MP4 file converted to WAV: {wav_path}")


@app.route('/process-video', methods=['POST'])
def process_video():
    if 'videoUrl' not in request.json:
        return jsonify({"error": "No video URL provided"}), 400

    video_url = request.json['videoUrl']
    temp_video_path = None

    try:
        # Step 1: Download the MP4 file from the provided URL
        with tempfile.NamedTemporaryFile(delete=False, suffix=".mp4") as temp_video_file:
            temp_video_path = temp_video_file.name
            download_video(video_url, temp_video_path)

        # Step 2: Get the information from the downloaded MP4 file synchronously
        video_info = get_information_from_video_using_OCR(temp_video_path, interval=1)

        if not video_info:
            video_info = ""

        # Step 3: Convert the MP4 to WAV
        with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as temp_wav_file:
            temp_wav_path = temp_wav_file.name
            convert_mp4_to_wav(temp_video_path, temp_wav_path)

        # Step 4: Transcribe the audio
        audio_info = transcribe_audio(temp_wav_path)
        
        # If no transcription is present, use an empty string
        if not audio_info:
            audio_info = ""

        # Step 5: Generate structured recipe information using Gemini API synchronously
        structured_data = query_gemini_api(video_info, audio_info)

        return jsonify(structured_data)

    except Exception as e:
        return jsonify({"error": str(e)}), 500

    finally:
        # Clean up temporary video file and WAV file
        if temp_video_path and os.path.exists(temp_video_path):
            os.remove(temp_video_path)
            print(f"Temporary video file deleted: {temp_video_path}")

        if temp_wav_path and os.path.exists(temp_wav_path):
            os.remove(temp_wav_path)
            print(f"Temporary WAV file deleted: {temp_wav_path}")


def query_gemini_api(video_transcription, audio_transcription):
    """
    Send transcription text to Gemini API and fetch structured recipe information synchronously.
    """
    try:
        # Define the structured prompt
        prompt = (
            "Analyze the provided cooking video and audio transcription combined and based on the combined information extract the following structured information:\n"
            "1. Recipe Name: Identify the name of the dish being prepared.\n"
            "2. Ingredients List: Extract a detailed list of ingredients with their respective quantities (if mentioned).\n"
            "3. Steps for Preparation: Provide a step-by-step breakdown of the recipe's preparation process, organized and numbered sequentially.\n"
            "4. Cooking Techniques Used: Highlight the cooking techniques demonstrated in the video, such as searing, blitzing, wrapping, etc.\n"
            "5. Equipment Needed: List all tools, appliances, or utensils mentioned, e.g., blender, hot pan, cling film, etc.\n"
            "6. Nutritional Information (if inferred): Provide an approximate calorie count or nutritional breakdown based on the ingredients used.\n"
            "7. Serving size: In count of people or portion size.\n"
            "8. Special Notes or Variations: Include any specific tips, variations, or alternatives mentioned.\n"
            "9. Festive or Thematic Relevance: Note if the recipe has any special relevance to holidays, events, or seasons.\n"
            f"Text: {audio_transcription}\n"
            f"Text: {video_transcription}\n"
        )

        # Prepare the payload and headers
        payload = {
            "contents": [
                {
                    "parts": [
                        {"text": prompt}
                    ]
                }
            ]
        }
        headers = {"Content-Type": "application/json"}

        # Send request to Gemini API synchronously
        response = requests.post(
            f"{GEMINI_API_ENDPOINT}?key={GEMINI_API_KEY}",
            json=payload,
            headers=headers,
        )

        # Raise error if response code is not 200
        response.raise_for_status()

        data = response.json()

        return data.get("candidates", [{}])[0].get("content", {}).get("parts", [{}])[0].get("text", "No result found")

    except requests.exceptions.RequestException as e:
        print(f"Error querying Gemini API: {e}")
        return {"error": str(e)}


if __name__ == '__main__':
    app.run(debug=True)