#!/usr/bin/env python3

import argparse
import os
import requests
import json
import multiprocessing as mp
from loguru import logger
import shutil
from PIL import Image
from ossclient import *
from common import *
import io
from tqdm import tqdm
import datetime
from urllib.parse import quote

data_dir = 'data'

class ScanDataFetcher(object):
    def __init__(self):
        self.token = '3ebd8c33-f46e-4b06-bda8-4c0f5f5eb530'

    def make_headers(self):
        return {
            'Authorization': f'Token {self.token}'
        }
    
    def load_local_scan_data(self):
        ret = {}
        scans_dir = os.path.join(data_dir, 'scans')
        os.makedirs(scans_dir, exist_ok=True)
        for scan_id in os.listdir(scans_dir):
            scan_dir = os.path.join(scans_dir, scan_id)
            if not os.path.isdir(scan_dir):
                continue
            fetch_state_path = os.path.join(scan_dir, 'fetch-state.json')
            if not os.path.exists(fetch_state_path):
                continue
            metadata_path = os.path.join(scan_dir, 'metadata.json')
            if not os.path.exists(metadata_path):
                continue
            md = json.load(open(metadata_path))
            ret[md['id']] = md
        return ret

    def fetch(self, sample_rate=None, scan_ids=None):
        local_scan_data = self.load_local_scan_data()
        logger.info(f'local_scan_data: {len(local_scan_data)}')
        url = 'https://themblem.com/api/v1/scan-data-labels/'
        r = requests.get(url, headers=self.make_headers(), timeout=30)
        data = r.json()
        fetch_backlog = []
        scan_ids_set = set(scan_ids) if scan_ids else None
        for item in data['items']:
            if 'code' not in item or 'id' not in item or not item.get('labels') or 'image' not in item or not item.get('image'):
                continue
            if scan_ids_set and item['id'] not in scan_ids_set:
                continue
            if item['id'] in local_scan_data:
                local_labels = local_scan_data[item['id']]['labels']
                if local_labels == item['labels']:
                    continue
            fetch_backlog.append(item)
        if sample_rate:
            fetch_backlog = random.sample(fetch_backlog, int(len(fetch_backlog) * sample_rate))
        logger.info(f'fetch_backlog: {len(fetch_backlog)}')
        pool = mp.Pool(min(8, mp.cpu_count()))
        counts = defaultdict(int)
        for r in tqdm(pool.imap_unordered(self.fetch_one_scan, fetch_backlog), total=len(fetch_backlog)):
            counts[r] += 1
        logger.info(f'counts: {counts}')
        pool.close()
        pool.join()

    def fetch_one_scan(self, scan):
        try:
            self.do_fetch_one_scan(scan)
            return 'ok'
        except Exception as e:
            scan_dir = os.path.join(data_dir, 'scans', str(scan['id']))
            fetch_state_path = os.path.join(scan_dir, 'fetch-state.json')
            with open(fetch_state_path, 'w') as f:
                json.dump({
                    'status': 'error',
                    'timestamp': datetime.datetime.now().isoformat(),
                    'scan_id': scan['id'],
                    'labels': scan.get('labels', ''),
                    'error': str(e)
                }, f, indent=2)
            return 'error'

    def do_fetch_one_scan(self, scan):
        scan_dir = os.path.join(data_dir, 'scans', str(scan['id']))
        os.makedirs(scan_dir, exist_ok=True)
        
        # Check if fetch-state.json exists, if so skip this scan
        fetch_state_path = os.path.join(scan_dir, 'fetch-state.json')
        if os.path.exists(fetch_state_path):
            return
        
        metadata_path = os.path.join(scan_dir, 'metadata.json')
        metadata_str = json.dumps(scan, indent=2)
        frame_img_url = f'https://themblem.com/api/v1/oss-image/?token={self.token}&name={quote(scan["image"])}'
        frame_img_file = os.path.join(scan_dir, 'frame.jpg')
        if not os.path.exists(frame_img_file):
            r = requests.get(frame_img_url, timeout=30)
            r.raise_for_status()  # Raise an exception for bad status codes
            with open(frame_img_file, 'wb') as f:
                f.write(r.content)
        std_img_file = os.path.join(scan_dir, 'std.jpg')
        if not os.path.exists(std_img_file):
            std_img = Image.open(io.BytesIO(get_qr_image_bytes(scan['code'])))
            std_img.save(std_img_file)
        with open(metadata_path, 'w') as f:
            f.write(metadata_str)
        frame_qr_img_file = os.path.join(scan_dir, 'frame-qr.jpg')
        if not os.path.exists(frame_qr_img_file):
            frame_img = Image.open(frame_img_file)
            _, frame_qr = extract_qr(frame_img)
            frame_qr.save(frame_qr_img_file)
        std_qr_img_file = os.path.join(scan_dir, 'std-qr.jpg')
        if not os.path.exists(std_qr_img_file):
            std_img = Image.open(std_img_file)
            _, std_qr = extract_qr(std_img)
            std_qr.save(std_qr_img_file)
        
        # Create fetch-state.json to mark successful completion
        fetch_state = {
            'status': 'completed',
            'timestamp': datetime.datetime.now().isoformat(),
            'scan_id': scan['id'],
            'labels': scan.get('labels', ''),
        }
        
        with open(fetch_state_path, 'w') as f:
            json.dump(fetch_state, f, indent=2)

def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument('--data-dir', type=str, default='data')
    parser.add_argument('--sample-rate', '-r', type=float)
    parser.add_argument('--scan-ids', type=str, help='Comma-separated list of scan IDs to fetch')
    return parser.parse_args()

def main():
    args = parse_args()
    global data_dir
    data_dir = args.data_dir
    fetcher = ScanDataFetcher()
    logger.info('fetch')
    scan_ids = [int(x.strip()) for x in args.scan_ids.split(',')] if args.scan_ids else None
    fetcher.fetch(args.sample_rate, scan_ids)

if __name__ == "__main__":
    main()