#!/usr/bin/env python3

import os
import shutil
import re

from operator import itemgetter

from jinja2 import Environment, PackageLoader, select_autoescape

from configuration import SITE_TITLE, THEME


PICTURES_DIR_NAME = "photos"
OUTPUT_DIR_NAME = "output"


def list_galleries_in(path):
    gallery_dirs = [f for f in os.scandir(path) if f.is_dir()]
    for gallery_dir in gallery_dirs:
        photos = list(list_photos_in(gallery_dir))
        if len(photos) == 0:
            continue

        photos.sort(key=itemgetter("name"))
        gallery = {
            "name": gallery_dir.name,
            "path": gallery_dir.path,
            "url": gallery_dir.name,
            "num_photos": len(photos),
            "photos": photos,
            "cover_photo": photos[0],
        }
        yield gallery


def list_photos_in(gallery_dir):
    photo_files = [
        f for f in os.scandir(gallery_dir) if re.match(".+\.jpg", f.name, re.I)
    ]
    for photo_file in photo_files:
        url = os.path.join(gallery_dir.name, photo_file.name)
        thumb_url = os.path.join(gallery_dir.name, f"thumb_{photo_file.name}")
        photo = {
            "name": photo_file.name,
            "path": photo_file.path,
            "url": url,
            "thumb_url": thumb_url,
        }
        yield photo


def generate_output_dir():
    output_path = os.path.join(os.curdir, OUTPUT_DIR_NAME)
    if not os.path.isdir(output_path):
        os.mkdir(output_path)
    return output_path


def generate_style(output_path):
    style_path = os.path.join(os.curdir, THEME, "style")
    style_output_path = os.path.join(output_path, "style")
    if os.path.isdir(style_output_path):
        shutil.rmtree(style_output_path)
    shutil.copytree(style_path, style_output_path)


def generate_index(output_path, galleries):
    index_path = os.path.join(output_path, "index.html")

    theme_path = os.path.join(os.curdir, THEME)
    jinja_env = Environment(
        loader=PackageLoader("boop", theme_path), autoescape=select_autoescape(["html"])
    )
    index_template = jinja_env.get_template("index.html.j2")

    with open(index_path, "w") as index_file:
        index_file.write(
            index_template.render(galleries=galleries, site_title=SITE_TITLE)
        )


def generate_gallery(output_path, gallery):
    generate_gallery_index(output_path, gallery)
    generate_gallery_dir(output_path, gallery)


def generate_gallery_index(output_path, gallery):
    gallery_index_path = os.path.join(output_path, f"{gallery['name']}.html")

    theme_path = os.path.join(os.curdir, THEME)
    jinja_env = Environment(
        loader=PackageLoader("boop", theme_path), autoescape=select_autoescape(["html"])
    )
    gallery_template = jinja_env.get_template("gallery.html.j2")

    with open(gallery_index_path, "w") as gallery_file:
        gallery_file.write(
            gallery_template.render(gallery=gallery, site_title=SITE_TITLE)
        )


def generate_gallery_dir(output_path, gallery):
    gallery_output_path = os.path.join(output_path, gallery["name"])
    if not os.path.isdir(gallery_output_path):
        os.mkdir(gallery_output_path)

    for photo in gallery["photos"]:
        photo_output_path = os.path.join(output_path, photo["url"])
        shutil.copyfile(photo["path"], photo_output_path)

        thumb_output_path = os.path.join(output_path, photo["thumb_url"])
        shutil.copyfile(photo["path"], thumb_output_path)


def main():
    pictures_folder = os.path.join(os.curdir, PICTURES_DIR_NAME)
    galleries = list(list_galleries_in(pictures_folder))
    if len(galleries) == 0:
        return

    galleries.sort(key=itemgetter("name"))
    output_path = generate_output_dir()
    generate_style(output_path)
    generate_index(output_path, galleries)
    for gallery in galleries:
        generate_gallery(output_path, gallery)


if __name__ == "__main__":
    main()