#!/usr/bin/python3

import sqlite3
from flask import Flask, request, render_template, g, send_from_directory
from flask_paginate import Pagination, get_page_parameter
import confuse
import re


DATABASE = "../data/diffs.db"
CONFIG_FILE = "../data/config.yaml"

config = confuse.Configuration('headline', __name__)
config.set_file(CONFIG_FILE)


app = Flask(__name__)


def get_db():
	db = getattr(g, '_database', None)
	if db is None:
		db = g._database = sqlite3.connect(DATABASE)
	db.row_factory = sqlite3.Row
	return db


@app.teardown_appcontext
def close_connection(exception):
	db = getattr(g, '_database', None)
	if db is not None:
		db.close()


def websearch_to_fts_query(search: str):
	"""
	Converts web searches into fts queries:
		'this is "a test"' -> '"this" OR "is" OR "a test"'
	"""
	return ' OR '.join(['"'+m.group(0)+'"' for m in re.finditer(r'(?<=")[^"]+(?=")|[^\s"]+', search)])


@app.route('/')
def index():
	db = get_db().cursor()

	search = request.args.get("search", type=str, default="")
	query = websearch_to_fts_query(search) if search else None

	db.execute(f"SELECT count(*) FROM diffs{'_fts(?)' if query else ''}", (query,) if query else ())

	diff_count = db.fetchall()[0][0]


	#flask-paginate
	page = request.args.get(get_page_parameter(), type=int, default=1)

	pagination = Pagination(page=page, total=diff_count, record_name='diffs', css_framework='bootstrap5')


	page_skip = pagination.skip
	per_page = pagination.per_page
	if query:
		db.execute(
			"SELECT * FROM diffs JOIN (SELECT rowid FROM diffs_fts(?)) filter ON filter.rowid = diffs.diff_id ORDER BY diff_id DESC LIMIT ? OFFSET ?",
			(query,per_page,page_skip)
		)
	else:
		db.execute(
			"SELECT * FROM diffs ORDER BY diff_id DESC LIMIT ? OFFSET ?",
			(per_page,page_skip)
		)
	diffs = db.fetchall()

	return render_template('./index.html',
						   diffs=diffs,
						   pagination=pagination,
						   diff_count = diff_count,
						   search=search,
						   )


@app.route("/article/<path:article_url>")
def article_detail(article_url: str):
	db = get_db().cursor()
	db.execute("SELECT * FROM diffs WHERE article_url = ?", (article_url,))
	result = db.fetchall()
	# TODO: Handle if nothing is found and return 404 in that case.
	return render_template("article_detail.html", article_url=article_url, diffs=result )


@app.route('/about')
def about():
	return render_template('about.html')


@app.route('/feeds')
def feed_list():
	feeds = []
	for conf in config['feeds']:
		feed = {
			'rss_source'	:	str(conf['rss_source']),
			'unique_tag'	:	str(conf['unique_tag']),
			'feed_name'		:	str(conf['name'])
		}
		feeds.append(feed)
	return render_template('feeds.html', feeds=feeds)


@app.route('/robots.txt')
def static_from_root():
    return send_from_directory(app.static_folder, request.path[1:])

if __name__ == "__main__":
	app.run(host="0.0.0.0")