#!/usr/bin/env python

import os
import sys
import yaml

from jinja2 import Environment, FileSystemLoader

templates = Environment(loader=FileSystemLoader([os.path.realpath(os.path.join(os.getcwd(), "templates")), os.path.join(os.path.split(os.path.realpath(__file__))[0], "templates")]))
index_template = templates.get_template("index.html")
gallery_index_template = templates.get_template("gallery-index.html")


def error(test, error_message):
    if not test:
        sys.stderr.write(error_message)
        sys.stderr.write("\n")
        sys.stderr.write("Abort.\n")
        sys.exit(1)


def main():
    error(os.path.exists(os.path.join(os.getcwd(), "settings.yaml")), "I can't find a settings.yaml in the current working directory")

    settings = yaml.safe_load(open("settings.yaml", "r"))

    error(isinstance(settings, dict), "Your settings.yaml should be a dict")
    error(settings.get("title"), "You should specify a title in your main settings.yaml")

    title = settings["title"]
    sub_title = settings.get("sub_title", "")
    front_page_galleries_cover = []

    dirs = filter(lambda x: x not in (".", "..") and os.path.isdir(x) and os.path.exists(os.path.join(os.getcwd(), x, "settings.yaml")), os.listdir(os.getcwd()))

    error(dirs, "I can't find at least one directory with a settings.yaml in the current working directory, you don't have any gallery?")

    for gallery in dirs:
        gallery_settings = yaml.safe_load(open(os.path.join(os.getcwd(), gallery, "settings.yaml"), "r"))

        error(isinstance(gallery_settings, dict), "Your %s should be a dict" % (os.path.join(gallery, "settings.yaml")))
        error(gallery_settings.get("title"), "You should specify a title in %s" % (os.path.join(gallery, "settings.yaml")))
        error(gallery_settings.get("cover"), "You should specify a path to a cover picture in %s" % (os.path.join(gallery, "settings.yaml")))

        cover_image_path = os.path.join(os.getcwd(), gallery, gallery_settings["cover"])

        error(not os.path.exists(cover_image_path), "File for %s cover image doesn't exists at %s" % (gallery, cover_image_path))

        gallery_title = gallery_settings["title"]
        gallery_sub_title = gallery_settings.get("sub_title", "")
        gallery_date = gallery_settings["date"] if "date" in gallery_settings else ""

        front_page_galleries_cover.append({
            "title": gallery_title,
            "sub_title": gallery_sub_title,
            "date": gallery_date,
        })

    front_page_galleries_cover = sorted(front_page_galleries_cover, key=lambda x: x["date"])

    if not os.path.exists("build"):
        os.makedirs("build")


if __name__ == '__main__':
    main()