from flask import Blueprint, render_template, redirect

bp = Blueprint("homepage", __name__)

from app.models import *
from app.utils import get_toplevel_tags
from sqlalchemy.orm import joinedload
from sqlalchemy.sql.expression import func


@bp.route("/")
def home():
	def join(query):
		return query.options(
				joinedload(Package.license),
				joinedload(Package.media_license))

	query   = Package.query.filter_by(state=PackageState.APPROVED)
	count   = query.count()

	featured = query.filter(Package.tags.any(name="featured")).order_by(func.random()).limit(6).all()
	toplevel_tags = get_toplevel_tags() #Tag.query.filter_by(is_toplevel=True).all()
	popular = {}
	new     = join(query.order_by(db.desc(Package.approved_at))).limit(4).all()
	for toplevel_tag in toplevel_tags:
		popular[toplevel_tag.name] = join(query.filter(Package.tags.any(name=toplevel_tag.name)).order_by(db.desc(Package.score))).limit(8).all() 
	
	high_reviewed = join(query.order_by(db.desc(Package.score - Package.score_downloads))) \
			.filter(Package.reviews.any()).limit(4).all()

	updated = db.session.query(Package).select_from(PackageRelease).join(Package) \
			.filter_by(state=PackageState.APPROVED) \
			.order_by(db.desc(PackageRelease.releaseDate)) \
			.limit(20).all()
	updated = updated[:4]

	reviews = PackageReview.query.filter_by(recommends=True).order_by(db.desc(PackageReview.created_at)).limit(5).all()

	downloads_result = db.session.query(func.sum(Package.downloads)).one_or_none()
	downloads = 0 if not downloads_result or not downloads_result[0] else downloads_result[0]

	tags = db.session.query(func.count(Tags.c.tag_id), Tag) \
		.select_from(Tag).outerjoin(Tags).group_by(Tag.id).order_by(db.asc(Tag.title)).all()

	return render_template("index.html", count=count, downloads=downloads, tags=tags, featured=featured,
			new=new, updated=updated, popular=popular, toplevel=toplevel_tags, high_reviewed=high_reviewed, reviews=reviews)