"""
    Configuration
"""

import logging

class Configuration (object) :
    """
        Various configuration settings
    """
    ## runtime settings

    # do not modify anything
    read_only           = False

    # the path to the gallery
    gallery_path        = "."
    
    # force-update items
    force_update        = False

    # number of task threads to use, may be logical False
    task_threads        = 4

    # minimum logging level
    log_level           = logging.INFO

    ## detailed configuration
    # the name of the gallery
    gallery_title       = "Image Gallery"

    # recognized image extensions
    image_exts          = ('jpg', 'jpeg', 'png', 'gif', 'bmp')
    
    # subdirectory used for generated thumbnails/previews
    thumb_dir           = 'thumbs'
    preview_dir         = 'previews'

    # size of generated thumbnails/previews
    thumb_size          = (160, 120)
    preview_size        = (640, 480)

    # number of images displayed per folder page
    images_per_page     = 50
    
    # exif tags used in output
    # Copyright (C) 2008, Santtu Pajukanta <santtu@pajukanta.fi>
    # XXX: import from dexif?
    exif_tags           = [
        # TODO Create date is in a useless format, needs some strptime love
        ("CreateDate",              "Create date"               ),
        ("Model",                   "Camera model"              ),
        ("Aperture",                "Aperture"                  ),
        ("ExposureMode",            "Exposure mode"             ),
        ("ExposureCompensation",    "Exposure compensation"     ),
        ("ExposureTime",            "Exposure time"             ),
        ("Flash",                   "Flash mode"                ),
        ("ISO",                     "ISO"                       ),
        ("ShootingMode",            "Shooting mode"             ),
        ("LensType",                "Lens type"                 ),
        ("FocalLength",             "Focal length"              )
    ]
    

    ### functions
    def is_image (self, file) :
        """
            Tests if the given File is an image, based on its file extension
        """

        return file.matchext(self.image_exts)