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from degal.command import command

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from degal.concurrent import task

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from degal import templates

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def render_image_html (ctx, image) :

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    """

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        Render the thumbnails and .html for one image

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    """

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    ctx.log_debug("%s", image.html)

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    # render output

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    tpl = templates.master(ctx.gallery, image, 

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        templates.image_page(image)

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    )

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    # write output

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    tpl.render_file(image.html)

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def update_image_thumbs (image) :

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    """

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        Render the thubmnails for the given image, returning the image.

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        This /should/ be threadsafe.

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    """

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    # this will unconditionally update the image

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    image.update()

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    return image

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def render_folder_images (ctx, images, for_update=True) :

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    """

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        Render the given series of images

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    """

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    # XXX: handle this thumb-update/html-update stuff better

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    # render all HTML

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    for image in images :

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        render_image_html(ctx, image)

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    # render the thumbnails concurrently

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    for image in ctx.concurrent.execute(

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        task(update_image_thumbs, image) 

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            for image in images 

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            # only test if not already filtered for update

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            # XXX: externalize logic

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            if for_update or ctx.config.force_thumb or image.stale()

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    ) :

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        # log image path

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        ctx.log_info("%s", image)

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        # release large objects that are not needed anymore

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        image.cleanup()

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def render_folder_html (ctx, folder) :

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    """

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        Render the .html output for one folder

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    """

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    # render each page separately

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    for page in xrange(folder.page_count) :

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        # output .html page

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        html = folder.html_page(page)

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        ctx.log_debug("%s", html)

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        # render template

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        tpl = templates.master(ctx.gallery, folder,

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            templates.folder_page(folder, page)

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        )

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        # write output

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        tpl.render_file(html)

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def render_folder (ctx, folder) :

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    """

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        Render the HTML/images for this folder if needed, and recrurse into subfolders.

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    """

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    if ctx.config.force_html or ctx.config.force_thumb :

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        # index all

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        for_update = False

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    else :

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        # only new images

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        for_update = True

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    # full count of images

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    image_count = len(folder.images)

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    # index selected images

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    new_images = list(folder.index_images(for_update=for_update))

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        # update folder index

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        render_folder_html(ctx, folder)

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        ctx.log_info("%s - render %d/%d images", folder, len(new_images), image_count)

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        # update images

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        render_folder_images(ctx, new_images, for_update)

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    else :

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        ctx.log_info("%s - up to date", folder)

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@command

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def main (ctx) :

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    """

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        Scan the gallery for new folders/images, and render updated ones

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    """

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    # render the gallery

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    render_folder(ctx, ctx.gallery)

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