#!/usr/bin/env python3
"""
A display interface for archived 4chan quest threads.
"""
from aiohttp import web
import jinja2
import aiohttp_jinja2
from aiohttp_jinja2 import render_template
import asyncpg
import uvloop

import config
import filters

uvloop.install()
routes = web.RouteTableDef()

@routes.get('/', name='index')
async def index(request):
	"""The index page."""
	async with request.app['pool'].acquire() as conn:
		threads = await conn.fetch("SELECT * FROM thread ORDER BY time ASC")
	return render_template("index.html", request, locals())


@routes.get(r'/{thread_id:\d+}', name='thread')
async def thread(request):
	"""A single thread page."""
	async with request.app['pool'].acquire() as conn:
		data = await conn.fetch(
			"SELECT post.id, post.name, post.trip_code, post.subject, "
			"post.time, post.body, "
			"tag.name AS tag_name, link.link_to, link.link_from  "
			"FROM post "
			"LEFT JOIN tag ON (post.id = tag.post_id) "
			"LEFT JOIN link ON (post.id = link.link_from) "
			"WHERE post.thread_id = $1 "
			"ORDER BY post.id ASC",
			int(request.match_info['thread_id']))
	posts = {}
	backlinks = {}
	for row in data:
		post = posts.get(row['id'], {})
		for key, value in row.items():
			if key == 'tag_name':
				tags = post.get('tags', [])
				tags.append(value)
				post['tags'] = tags
			elif key == 'link_to':
				link_tos = post.get('link_tos', [])
				link_tos.append(value)
				post['link_tos'] = link_tos
			elif key == 'link_from':
				back_post = backlinks.get(row['link_to'], [])
				back_post.append(value)
				backlinks[row['link_to']] = back_post
			post[key] = value
		post['tags'] = [t for t in post['tags'] if t]
		posts[row['id']] = post

	return render_template("thread.html", request, locals())


async def init_app():
	"""Initializes the application."""
	app = web.Application()
	aiohttp_jinja2.setup(
		app,
		trim_blocks=True,
		lstrip_blocks=True,
		undefined=jinja2.StrictUndefined,
		loader=jinja2.FileSystemLoader('templates'),
		filters={
			'quotelink': filters.quotelink,
		},
	)
	app['pool'] = await asyncpg.create_pool(**config.db)

	app.router.add_routes(routes)

	app_wrap = web.Application()
	app_wrap.add_subapp(config.url_prefix, app)
	return app_wrap


if __name__ == "__main__":
	app = init_app()
	web.run_app(app, host='0.0.0.0', port=5450)