import os
import tempfile
os.environ["PLAYWRIGHT_BROWSERS_PATH"] = "/home/user/.cache/ms-playwright"

import logging
from dotenv import load_dotenv
import io
import cv2
import numpy as np
from PIL import Image
import json
import requests
import uuid
import importlib
import io
import boto3
from flask import Flask, request, jsonify, send_file
import numpy as np

from app.util.gen_ai_base import GenAIBaseClient
from app.util.browser_agent import BrowserAgent
from app.util.db_utils import DBManager
from app.util.passport_photo_engine.haar_face_detector import HaarFaceDetector
from app.util.passport_photo_engine.manual_face_extractor import ManualFaceExtractor
from app.util.passport_photo_engine.passport_cropper import PassportCropper
from app.util.passport_photo_engine.segmenter_rmbg import SegmenterRMBG
from app.util.parameter_utils import init_secret
import sys
sys.stdout.reconfigure(line_buffering=True)
API = "https://api-dev.spun.global"

print("--- Loading Passport AI Models (This happens once) ---")
passport_models = {
    "segmenter": SegmenterRMBG(),     # Heavy model (GPU/CPU)
    "detector": HaarFaceDetector(),   # Fast model
    "extractor": ManualFaceExtractor()
}
print("--- Passport Models Ready ---")

PASSPORT_COLORS = {
    "white": (255, 255, 255),
    "id_red": (0, 0, 219),
    "id_blue": (219, 0, 0),
    "light_blue": (235, 206, 135)
}

def create_app() -> Flask:
    load_dotenv() 

    app = Flask(__name__)
    # logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    try:
        aws_param_path = os.getenv("AWS_PARAMETER_STORE_PATH")
        print("AWS PARAM PATH:", aws_param_path)
        if aws_param_path:
            init_secret(aws_param_path)
            logging.info("Secrets loaded from AWS SSM Parameter Store.")
    except Exception as e:
        logging.exception(f"Could not load secrets from SSM: {e}")
    print("ENV VARS:", dict(os.environ))

    GENERATOR_MAP = {
        "japan-multientry-tourist": (
            "app.util.japan_multientry_visa_letter_generator",
            "JapanMultiEntryVisaLetterGenerator",
        ),
        "schengen": (
            "app.util.schengen_visa_letter_generator",
            "SchengenVisaLetterGenerator",
        ),
        "sponsorship": (
            "app.util.sponsorship_letter_generator",
            "SponsorshipLetterGenerator"
        ),
        "housewife-statement": (
            "app.util.housewife_statement_letter_generator",
            "HousewifeStatementLetterGenerator"
        ),
        "passport-collection": (
            "app.util.passport_collection_letter_generator",
            "PassportCollectionLetterGenerator"
        )
    }

    WORKER_API_KEY = os.getenv("WORKER_API_KEY")
    
    @app.route('/prefill/<visa_type>/<int:application_id>', methods=['GET'])
    def get_prefill_data(visa_type, application_id):
        """
        Dynamically fetches and merges data for a specific visa type
        to pre-fill the frontend form.
        """
        try:
            if visa_type.lower() not in GENERATOR_MAP:
                return jsonify({"error": f"Unsupported visa type: {visa_type}"}), 400

            module_path, class_name = GENERATOR_MAP[visa_type.lower()]

            module = importlib.import_module(module_path)
            generator_class = getattr(module, class_name)

            # Instantiate the generator, passing the application_id
            letter_generator = generator_class(data={"application_id": application_id})

            # Call the new public method to fetch and merge data
            # This method MUST exist on the generator class (see step 2)
            prefill_data = letter_generator.get_prefill_data()
            
            if not prefill_data:
                return jsonify({"error": "Failed to prepare data or no data found."}), 500

            return jsonify(prefill_data), 200

        except AttributeError as e:
            # This error happens if the class doesn't have "get_prefill_data"
            msg = f"Generator {class_name} does not implement 'get_prefill_data'. {e}"
            logging.error(msg)
            return jsonify({"error": msg}), 501 # 501 Not Implemented
        except Exception as e:
            logging.error(f"Error in /prefill/{visa_type}/{application_id}: {e}", exc_info=True)
            return jsonify({"error": str(e)}), 500
        
    @app.route('/scrape', methods=['POST'])
    async def scrape():
        try:
            raw = request.get_data(as_text=True)
            print("Raw body:", raw)

            body = json.loads(raw)
            logging.info(f"Headers: {dict(request.headers)}")
            logging.info(f"Raw data: {request.data}")

            url = body.get('url')
            max_depth = body.get('max_depth', 2)

            if not url:
                return jsonify({"error": "URL is required"}), 400
            api_key = os.getenv("GOOGLE_AI_STUDIO_API_KEY")
            explorer = GenAIBaseClient(api_key=api_key)

            try:
                async with BrowserAgent(model=explorer, max_depth=max_depth) as agent:
                    root_node = await agent.run(start_url=url)
                    if not root_node:
                        return jsonify({"error": "Exploration failed or returned no data"}), 500
            except Exception as e:
                logging.error(f"Error during scraping: {e}")
                return jsonify({"error": str(e)}), 500
            response_data = {
                "link_map": {href: node.model_dump() for href, node in agent.link_map.items()},
                "token_usage": explorer.token_usage
            }
            headers = {
                "X-WORKER-Api-Key": WORKER_API_KEY,
                "Content-Type": "application/json"
            }

            body = {
                "external_id": str(uuid.uuid4()),
                "history": response_data['link_map'],
                "smart_type": "data_extractor",
                "provider_type": "google_ai_studio",
                "total_input_amount": explorer.token_usage['input'],
                "total_output_amount": explorer.token_usage['output']
                }
            try:
                record_response = requests.post(
                    f"{API}/v1/smart/token/record-usage",
                    headers=headers,
                    json=body
                )
                record_response.raise_for_status() # Raise exception for 4xx/5xx errors
                logging.info("Token usage recorded successfully.")
            except requests.exceptions.RequestException as e:
                # Log the error, but don't fail the whole request.
                # The user should still get their scrape data.
                logging.error(f"Failed to record token usage: {e}")
            return jsonify(response_data), 200
        except json.JSONDecodeError as e:
            return jsonify({"error": f"Invalid JSON: {e}"}), 400
        except Exception as e:
            import traceback
            traceback.print_exc()
            return jsonify({"error": str(e)}), 500
    
    @app.route('/generate/<visa_type>', methods=['POST'])
    def generate_visa_letter(visa_type):
        """
        Dynamically generates visa letters based on <visa_type>.
        Example:
        POST /generate/schengen
        POST /generate/japan-multientry-tourist
        POST /generate/sponsorship
        POST /generate/housewife-statement
        """
        try:
            data = request.get_json()
            if not data:
                return jsonify({"error": "No JSON payload provided"}), 400

            if visa_type.lower() not in GENERATOR_MAP:
                return jsonify({"error": f"Unsupported visa type: {visa_type}"}), 400

            module_path, class_name = GENERATOR_MAP[visa_type.lower()]

            module = importlib.import_module(module_path)
            generator_class = getattr(module, class_name)

            letter_generator = generator_class(data)

            with tempfile.TemporaryDirectory() as tempdir:
                pdf_filepath, error_msg = letter_generator.compile_pdf(tempdir)

                if error_msg:
                    return jsonify({"error": error_msg}), 500

                with open(pdf_filepath, "rb") as f:
                    pdf_bytes = io.BytesIO(f.read())

                pdf_bytes.seek(0)

                return send_file(
                    pdf_bytes,
                    mimetype="application/pdf",
                    as_attachment=True,
                    download_name=f"{visa_type.replace('-', '_')}_visa_letter.pdf",
                )

        except Exception as e:
            print(f"Error in /generate/{visa_type}: {e}")
            return jsonify({"error": str(e)}), 500
        
    @app.route("/generate-visa-photo", methods=["POST"])
    def generate_passport_visa():
        data = request.get_json()
        bg_color_name = data.get('bg_color_name', 'white')
        output_size = data.get('output_size', (600, 800))
        if not data.get("raw_photo"):
            return jsonify({"error": "Missing required field: 'raw_photo'"}), 400
        response = requests.get(data['raw_photo'], stream=True)
        if response.status_code != 200:
            return jsonify({"error": f"Failed to download image from S3. Status: {response.status_code}"}), 400
        try:
            # Read image
            in_memory_file = io.BytesIO(response.content)
            pil_image = Image.open(in_memory_file).convert("RGB")
            img_rgb = np.array(pil_image)

            # Get models
            seg = passport_models["segmenter"]
            det = passport_models["detector"]
            ext = passport_models["extractor"]

            # 1. Segment
            mask = seg.segment(img_rgb)

            # 2. Detect
            face_rect = det.detect(img_rgb)
            if face_rect is None:
                return jsonify({"error": "No face detected"}), 400
            x, y, w, h = face_rect

            # 3. Angle
            info = ext.extract_face(img_rgb, mask)
            angle = info.get("chin_angle", 0.0)

            # 4. Process
            # TODO: adjust bg color and size based on visa requirements
            selected_bg = PASSPORT_COLORS.get(bg_color_name, (255, 255, 255))
            cropper = PassportCropper(output_size=output_size, bg_color=selected_bg)
            
            img_clean = cropper.composite(img_rgb, mask)
            final_passport = cropper.crop_with_dynamic_zoom(
                img_clean, 
                angle, 
                (x, y, w, h), 
                top_margin=0.4, 
                bottom_margin=1
            )
            # Return result
            # Encode image to memory buffer
            is_success, buffer = cv2.imencode(".jpg", final_passport)
            if not is_success:
                 return jsonify({"error": "Failed to encode image"}), 500
            
            # Prepare for S3 Upload
            file_stream = io.BytesIO(buffer)
            s3_client = boto3.client('s3',
                aws_access_key_id=os.getenv("AWS_ACCESS_KEY"),
                aws_secret_access_key=os.getenv("AWS_SECRET_KEY"),
                region_name=os.getenv("AWS_REGION")          
            )
            
            # You should set this env var or hardcode your bucket
            S3_BUCKET_NAME = os.getenv("S3_PUBLIC_BUCKET", "spun-core-api-temp-development") 
            file_key = f"generated-visa-photo/{uuid.uuid4()}.jpg"
            
            # Upload
            s3_client.upload_fileobj(
                file_stream,
                S3_BUCKET_NAME,
                file_key,
                ExtraArgs={'ContentType': 'image/jpeg'}
            )
            s3_url = s3_client.generate_presigned_url(
                'get_object',
                Params={'Bucket': S3_BUCKET_NAME, 'Key': file_key},
                ExpiresIn=3600
            )
            return jsonify({
                "status": "success",
                "url": s3_url
            })

        except Exception as e:
            print(f"Passport Error: {e}")
            return jsonify({"error": str(e)}), 500
    
    @app.route('/photo-metadata', methods=['GET'])
    def photo_metadata():
        """
        Endpoint to get visa photo metadata per service.
        """
        try:
            db_utils = DBManager()
            metadata = db_utils.get_visa_photo_metadata_per_service()
            return jsonify(metadata), 200
        except Exception as e:
            logging.error(f"Error in /photo-metadata: {e}", exc_info=True)
            return jsonify({"error": str(e)}), 
    @app.route('/', methods=['GET'])
    def hello_world():
        return "Flask server is running.", 200
    return app

app = create_app()

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