photofloat/scanner/PhotoAlbum.py

from CachePath import *
from datetime import datetime
import json
import os
import os.path
from PIL import Image
from PIL.ExifTags import TAGS
import gc

class Album(object):
	def __init__(self, path):
		self._path = trim_base(path)
		self._photos = list()
		self._albums = list()
		self._photos_sorted = True
		self._albums_sorted = True
	@property
	def photos(self):
		return self._photos
	@property
	def albums(self):
		return self._albums
	@property
	def path(self):
		return self._path
	def __str__(self):
		return self.path
	@property
	def cache_path(self):
		return json_cache(self.path)
	@property
	def date(self):
		self._sort()
		if len(self._photos) == 0 and len(self._albums) == 0:
			return datetime(1900, 1, 1)
		elif len(self._photos) == 0:
			return self._albums[-1].date
		elif len(self._albums) == 0:
			return self._photos[-1].date
		return max(self._photos[-1].date, self._albums[-1].date)
	def __cmp__(self, other):
		return cmp(self.date, other.date)
	def add_photo(self, photo):
		self._photos.append(photo)
		self._photos_sorted = False
	def add_album(self, album):
		self._albums.append(album)
		self._albums_sorted = False
	def _sort(self):
		if not self._photos_sorted:
			self._photos.sort()
			self._photos_sorted = True
		if not self._albums_sorted:
			self._albums.sort()
			self._albums_sorted = True
	@property
	def empty(self):
		if len(self._photos) != 0:
			return False
		if len(self._albums) == 0:
			return True
		for album in self._albums:
			if not album.empty:
				return False
		return True
		
	def cache(self, base_dir):
		self._sort()
		fp = open(os.path.join(base_dir, self.cache_path), 'w')
		json.dump(self, fp, cls=PhotoAlbumEncoder)
		fp.close()
	@staticmethod
	def from_cache(path):
		fp = open(path, "r")
		dictionary = json.load(fp)
		fp.close()
		return Album.from_dict(dictionary)
	@staticmethod
	def from_dict(dictionary, cripple=True):
		album = Album(dictionary["path"])
		for photo in dictionary["photos"]:
			album.add_photo(Photo.from_dict(photo, untrim_base(album.path)))
		if not cripple:
			for subalbum in dictionary["albums"]:
				album.add_album(Album.from_dict(subalbum), cripple)
		album._sort()
		return album
	def to_dict(self, cripple=True):
		self._sort()
		subalbums = []
		if cripple:
			for sub in self._albums:
				if not sub.empty:
					subalbums.append({ "path": trim_base_custom(sub.path, self._path), "date": sub.date })
		else:
			for sub in self._albums:
				if not sub.empty:
					subalbums.append(sub)
		return { "path": self.path, "date": self.date, "albums": subalbums, "photos": self._photos }
	def photo_from_path(self, path):
		for photo in self._photos:
			if trim_base(path) == photo._path:
				return photo
		return None
	
class Photo(object):
	thumb_sizes = [ (75, True), (150, True), (640, False), (800, False), (1024, False) ]
	def __init__(self, path, thumb_path=None, attributes=None):
		self._path = trim_base(path)
		self.is_valid = True
		try:
			mtime = file_mtime(path)
		except:
			self.is_valid = False
			return
		if attributes is not None and attributes["dateTimeFile"] >= mtime:
			self._attributes = attributes
			return
		self._attributes = {}
		self._attributes["dateTimeFile"] = mtime
		
		try:
			image = Image.open(path)
		except:
			self.is_valid = False
			return
		self._metadata(image)
		self._thumbnails(image, thumb_path)
	def _metadata(self, image):
		self._attributes["size"] = image.size
		self._orientation = 1
		try:
			info = image._getexif()
		except:
			return
		if not info:
			return
		
		exif = {}
		for tag, value in info.items():
			decoded = TAGS.get(tag, tag)
			if isinstance(value, str):
				value = value.strip()
				if isinstance(decoded, str) and decoded.startswith("DateTime"):
					try:
						value = datetime.strptime(value, '%Y:%m:%d %H:%M:%S')
					except:
						continue
			exif[decoded] = value
		
		if "Orientation" in exif:
			self._orientation = exif["Orientation"];
			if self._orientation in range(5, 9):
				self._attributes["size"] = (self._attributes["size"][1], self._attributes["size"][0])
			self._attributes["orientation"] = self._metadata.orientation_list[self._orientation - 1]
		if "Make" in exif:
			self._attributes["make"] = exif["Make"]
		if "Model" in exif:
			self._attributes["model"] = exif["Model"]
		if "ApertureValue" in exif:
			self._attributes["aperture"] = exif["ApertureValue"]
		elif "FNumber" in exif:
			self._attributes["aperture"] = exif["FNumber"]
		if "FocalLength" in exif:
			self._attributes["focalLength"] = exif["FocalLength"]
		if "ISOSpeedRatings" in exif:
			self._attributes["iso"] = exif["ISOSpeedRatings"]
		if "ISO" in exif:
			self._attributes["iso"] = exif["ISO"]
		if "PhotographicSensitivity" in exif:
			self._attributes["iso"] = exif["PhotographicSensitivity"]
		if "ExposureTime" in exif:
			self._attributes["exposureTime"] = exif["ExposureTime"]
		if "MeteringMode" in exif:
			self._attributes["meteringMode"] = exif["MeteringMode"]
		if "Flash" in exif:
			try:
				self._attributes["flash"] = self._metadata.flash_dictionary[exif["Flash"]]
			except:
				pass
		if "ExposureProgram" in exif:
			self._attributes["exposureProgram"] = self._metadata.exposure_list[exif["ExposureProgram"]]
		if "SpectralSensitivity" in exif:
			self._attributes["spectralSensitivity"] = exif["SpectralSensitivity"]
		if "MeteringMode" in exif:
			if exif["MeteringMode"] == 255:
				self._attributes["meteringMode"] = "Other"
			else:
				self._attributes["meteringMode"] = self._metadata.metering_list[exif["MeteringMode"]]
		if "ExposureCompensation" in exif:
			self._attributes["exposureCompensation"] = exif["ExposureCompensation"]
		if "ExposureBiasValue" in exif:
			self._attributes["exposureCompensation"] = exif["ExposureBiasValue"]
		if "DateTimeOriginal" in exif:
			self._attributes["dateTimeOriginal"] = exif["DateTimeOriginal"]
		if "DateTime" in exif:
			self._attributes["dateTime"] = exif["DateTime"]
	
	_metadata.flash_dictionary = {0x0: "No Flash", 0x1: "Fired",0x5: "Fired, Return not detected",0x7: "Fired, Return detected",0x8: "On, Did not fire",0x9: "On, Fired",0xd: "On, Return not detected",0xf: "On, Return detected",0x10: "Off, Did not fire",0x14: "Off, Did not fire, Return not detected",0x18: "Auto, Did not fire",0x19: "Auto, Fired",0x1d: "Auto, Fired, Return not detected",0x1f: "Auto, Fired, Return detected",0x20: "No flash function",0x30: "Off, No flash function",0x41: "Fired, Red-eye reduction",0x45: "Fired, Red-eye reduction, Return not detected",0x47: "Fired, Red-eye reduction, Return detected",0x49: "On, Red-eye reduction",0x4d: "On, Red-eye reduction, Return not detected",0x4f: "On, Red-eye reduction, Return detected",0x50: "Off, Red-eye reduction",0x58: "Auto, Did not fire, Red-eye reduction",0x59: "Auto, Fired, Red-eye reduction",0x5d: "Auto, Fired, Red-eye reduction, Return not detected",0x5f: "Auto, Fired, Red-eye reduction, Return detected"}
	_metadata.metering_list = ["Unknown", "Average", "Center-weighted average", "Spot", "Multi-spot", "Multi-segment", "Partial"]
	_metadata.exposure_list = ["Not Defined", "Manual", "Program AE", "Aperture-priority AE", "Shutter speed priority AE", "Creative (Slow speed)", "Action (High speed)", "Portrait", "Landscape", "Bulb"]
	_metadata.orientation_list = ["Horizontal (normal)", "Mirror horizontal", "Rotate 180", "Mirror vertical", "Mirror horizontal and rotate 270 CW", "Rotate 90 CW", "Mirror horizontal and rotate 90 CW", "Rotate 270 CW"]
		
	def _thumbnail(self, image, thumb_path, size, square=False):
		thumb_path = os.path.join(thumb_path, image_cache(self._path, size, square))
		print "Thumbing %s" % thumb_path
		if os.path.exists(thumb_path) and file_mtime(thumb_path) >= self._attributes["dateTimeFile"]:
			return
		gc.collect()
		try:
			image = image.copy()
		except:
			try:
				image = image.copy() # we try again to work around PIL bug
			except:
				print "Image is corrupted. %s will not be created." % thumb_path
				return
		if square:
			if image.size[0] > image.size[1]:
				left = (image.size[0] - image.size[1]) / 2
				top = 0
				right = image.size[0] - ((image.size[0] - image.size[1]) / 2)
				bottom = image.size[1]
			else:
				left = 0
				top = (image.size[1] - image.size[0]) / 2
				right = image.size[0]
				bottom = image.size[1] - ((image.size[1] - image.size[0]) / 2)
			image = image.crop((left, top, right, bottom))
			gc.collect()
		image.thumbnail((size, size), Image.ANTIALIAS)
		try:
			image.save(thumb_path, "JPEG")
		except:
			print "Could not thumbnail %s" % thumb_path
			os.unlink(thumb_path)
		
	def _thumbnails(self, image, thumb_path):
		mirror = image
		if self._orientation == 2:
			# Vertical Mirror
			mirror = image.transpose(Image.FLIP_LEFT_RIGHT)
		elif self._orientation == 3:
			# Rotation 180
			mirror = image.transpose(Image.ROTATE_180)
		elif self._orientation == 4:
			# Horizontal Mirror
			mirror = image.transpose(Image.FLIP_TOP_BOTTOM)
		elif self._orientation == 5:
			# Horizontal Mirror + Rotation 270
			mirror = image.transpose(Image.FLIP_TOP_BOTTOM).transpose(Image.ROTATE_270)
		elif self._orientation == 6:
			# Rotation 270
			mirror = image.transpose(Image.ROTATE_270)
		elif self._orientation == 7:
			# Vertical Mirror + Rotation 270
			mirror = image.transpose(Image.FLIP_LEFT_RIGHT).transpose(Image.ROTATE_270)
		elif self._orientation == 8:
			# Rotation 90
			mirror = image.transpose(Image.ROTATE_90)
		for size in Photo.thumb_sizes:
			self._thumbnail(mirror, thumb_path, size[0], size[1])
	@property
	def name(self):
		return os.path.basename(self._path)
	def __str__(self):
		return self.name
	@property
	def path(self):
		return self._path
	@property
	def image_caches(self):
		return [image_cache(self._path, size[0], size[1]) for size in Photo.thumb_sizes]
	@property
	def date(self):
		if not self.is_valid:
			return datetime(1900, 1, 1)
		if "dateTimeOriginal" in self._attributes:
			return self._attributes["dateTimeOriginal"]
		elif "dateTime" in self._attributes:
			return self._attributes["dateTime"]
		else:
			return self._attributes["dateTimeFile"]
	def __cmp__(self, other):
		date_compare = cmp(self.date, other.date)
		if date_compare == 0:
			return cmp(self.name, other.name)
		return date_compare
	@property
	def attributes(self):
		return self._attributes
	@staticmethod
	def from_dict(dictionary, basepath):
		del dictionary["date"]
		path = os.path.join(basepath, dictionary["name"])
		del dictionary["name"]
		for key, value in dictionary.items():
			if key.startswith("dateTime"):
				try:
					dictionary[key] = datetime.strptime(dictionary[key], "%a %b %d %H:%M:%S %Y")
				except:
					pass
		return Photo(path, None, dictionary)
	def to_dict(self):
		photo = { "name": self.name, "date": self.date }
		photo.update(self.attributes)
		return photo

class PhotoAlbumEncoder(json.JSONEncoder):
	def default(self, obj):
		if isinstance(obj, datetime):
			return obj.strftime("%a %b %d %H:%M:%S %Y")
		if isinstance(obj, Album) or isinstance(obj, Photo):
			return obj.to_dict()
		return json.JSONEncoder.default(self, obj)