import os
import re
import time
import numpy as np
import logging
from flask import Blueprint, request, jsonify
from PIL import Image

from app.models.sql_factory import search_by_phash, add_phash
from app.utils.im_utils import compute_phash_int
from app.utils.file_utils import sha256_stream

sanitize_re = re.compile('[\W]+')
valid_exts = ['.gif', '.jpg', '.jpeg', '.png']

LIMIT = 9

api = Blueprint('api', __name__)

@api.route('/')
def index():
  """
  API status test endpoint
  """
  return jsonify({ 'status': 'ok' })

@api.route('/v1/match', methods=['POST'])
def match():
  """
  Search by uploading an image
  """
  start = time.time()
  logging.debug(start)

  file = request.files['q']
  fn = file.filename
  if fn.endswith('blob'): # FIX PNG IMAGES?
    fn = 'filename.jpg'
  logging.debug(fn)

  basename, ext = os.path.splitext(fn)
  if ext.lower() not in valid_exts:
    return jsonify({
      'success': False,
      'match': False,
      'error': 'not_an_image'
    })

  ext = ext[1:].lower()

  im = Image.open(file.stream).convert('RGB')
  phash = compute_phash_int(im)

  logging.debug(phash)
  try:
    threshold = int(request.args.get('threshold') or 6)
    limit = int(request.args.get('limit') or 1)
    add = str(request.args.get('add') or 'true') == 'true'
  except:
    return jsonify({
      'success': False,
      'match': False,
      'error': 'param_error'
    })

  results = search_by_phash(phash=phash, threshold=threshold, limit=limit)

  if len(results) == 0:
    if add:
      hash = sha256_stream(file)
      add_phash(sha256=hash, phash=phash, ext=ext)
    if limit == 1:
      return jsonify({
        'success': True,
        'match': False,
      })
    else:
      return jsonify({
        'success': True,
        'match': False,
        'results': [],
      })

  if limit > 1:
    return jsonify({
      'success': True,
      'match': True,
      'results': results,
    })

  return jsonify({
    'success': True,
    'match': True,
    'closest_match': results[0],
  })