from degal.command import command
from degal import templates

def render_image_html (ctx, image) :
    """
        Render the thumbnails and .html for one image
    """

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

    # render output
    tpl = templates.master(ctx.gallery, image.title, image.html, 
        templates.image_page(image)
    )
    
    # write output
    tpl.render_file(image.html)

def render_image_thumbs (image) :
    """
        Render the thubmnails for the given image
    """

    image.update()

def render_folder_images (ctx, images, for_update=True) :
    """
        Render the given series of images
    """
    
    # render them in parallel as required
    for image in images :
        # log image path
        ctx.log_info("%s", image)
        
        # only test if not already filtered for update
        if for_update or image.stale() :
            # render output thumbs
            render_image_thumbs(image)
        
        # render HTML
        render_image_html(ctx, image)

        # release large objects that are not needed anymore
        # XXX: verify that this works
        del image.pil_image

def render_folder_page (ctx, folder) :
    """
        Render the .html output for one folder
    """

    # render each page separately
    for page in xrange(folder.page_count) :
        # output .html page
        html_file = folder.html_file(page)
    
        ctx.log_debug("%s", html_file)
        
        # render template
        tpl = templates.master(ctx.gallery, folder.title, html_file,
            templates.folder_page(folder, page)
        )

        # write output
        tpl.render_file(html_file)

def render_folder (ctx, folder) :
    """
        Render the HTML/images for this folder if needed, and recrurse into subfolders.
    """
    
    if ctx.config.force_html or ctx.config.force_thumb :
        # index all
        for_update = False

    else :
        # only new images
        for_update = True
    
    # full count of images
    image_count = len(folder.images)

    # index selected images
    new_images = list(folder.index_images(for_update=for_update))

    if new_images or ctx.config.force_html :
        # update folder index
        render_folder_page(ctx, folder)
        
        ctx.log_info("%s - render %d/%d images", folder, len(new_images), image_count)

        # update images
        render_folder_images(ctx, new_images, for_update)
    
    else :
        ctx.log_info("%s - up to date", folder)

    # index subfolders
    for subfolder in folder.subfolders :
        render_folder(ctx, subfolder)

@command
def main (ctx) :
    """
        Scan the gallery for new folders/images, and render updated ones
    """

    # render the gallery
    render_folder(ctx, ctx.gallery)