import hashlib
import logger
import os
import utils

from flask import Blueprint, jsonify, session, request
from flask import current_app as app
from werkzeug import secure_filename

from models import db, Files, Problems, Solves, Teams
from decorators import admins_only, api_wrapper, login_required, InternalException, WebException

blueprint = Blueprint("problem", __name__)

@blueprint.route("/add", methods=["POST"])
@admins_only
@api_wrapper
def problem_add():
	name = request.form["name"]
	category = request.form["category"]
	description = request.form["description"]
	hint = request.form["hint"]
	flag = request.form["flag"]
	value = request.form["value"]
	pid = utils.generate_string()
	while Problems.query.filter_by(pid=pid).first():
		pid = utils.generate_string()

	name_exists = Problems.query.filter_by(title=name).first()
	if name_exists:
		raise WebException("Problem name already taken.")

	problem = Problems(pid, name, category, description, flag, value, hint=hint)
	db.session.add(problem)
	db.session.commit()

	files = request.files.getlist("files[]")
	for _file in files:
		filename = secure_filename(_file.filename)

		if len(filename) == 0:
			continue

		file_path = os.path.join(app.config["UPLOAD_FOLDER"], filename)

		_file.save(file_path)
		db_file = Files(problem.pid, "/".join(file_path.split("/")[2:]))
		db.session.add(db_file)

	db.session.commit()

	return { "success": 1, "message": "Success!" }

@blueprint.route("/delete", methods=["POST"])
@admins_only
@api_wrapper
def problem_delete():
	pid = request.form["pid"]
	problem = Problems.query.filter_by(pid=pid).first()
	if problem:
		Solves.query.filter_by(pid=pid).delete()
		Problems.query.filter_by(pid=pid).delete()
		db.session.commit()
		return { "success": 1, "message": "Success!" }
	raise WebException("Problem does not exist!")

@blueprint.route("/update", methods=["POST"])
@admins_only
@api_wrapper
def problem_update():
	pid = request.form["pid"]
	name = request.form["name"]
	category = request.form["category"]
	description = request.form["description"]
	hint = request.form["hint"]
	flag = request.form["flag"]
	disabled = request.form.get("disabled", 0)
	value = request.form["value"]

	problem = Problems.query.filter_by(pid=pid).first()
	if problem:
		problem.name = name
		problem.category = category
		problem.description = description
		problem.hint = hint
		problem.flag = flag
		problem.disabled = disabled
		problem.value = value

		db.session.add(problem)
		db.session.commit()

		return { "success": 1, "message": "Success!" }
	raise WebException("Problem does not exist!")

@blueprint.route("/submit", methods=["POST"])
@api_wrapper
@login_required
def problem_submit():
	pid = request.form["pid"]
	flag = request.form["flag"]
	tid = session["tid"]

	problem = Problems.query.filter_by(pid=pid).first()
	team = Teams.query.filter_by(tid=tid).first()
	if problem:
		if flag == problem.flag:
			solve = Solves(pid, tid)
			team.score += problem.value
			problem.solves += 1
			db.session.add(solve)
			db.session.add(team)
			db.session.add(problem)
			db.session.commit()

			logger.log(__name__, logger.WARNING, "%s has solved %s by submitting %s" % (team.name, problem.name, flag))
			return { "success": 1, "message": "Correct!" }

		else:
			logger.log(__name__, logger.WARNING, "%s has incorrectly submitted %s to %s" % (team.name, flag, problem.name))
			raise WebException("Incorrect.")

	else:
		raise WebException("Problem does not exist!")

@blueprint.route("/data", methods=["POST"])
#@api_wrapper # Disable atm due to json serialization issues: will fix
@login_required
def problem_data():
	problems = Problems.query.add_columns("pid", "name", "category", "description", "hint", "value", "solves").order_by(Problems.value).filter_by(disabled=False).all()
	jason = []

	for problem in problems:
		problem_files = [ str(_file.location) for _file in Files.query.filter_by(pid=int(problem.pid)).all() ]
		jason.append({"pid": problem[1], "name": problem[2] ,"category": problem[3], "description": problem[4], "hint": problem[5], "value": problem[6], "solves": problem[7], "files": problem_files})

	return jsonify(data=jason)

def insert_problem(data, force=False):
	with app.app_context():
		if len(list(get_problem(pid=data["pid"]).all())) > 0:
			if force == True:
				_problem = Problems.query.filter_by(pid=data["pid"]).first()
				db.session.delete(_problem)
				db.session.commit()
			else:
				raise InternalException("Problem already exists.")

		insert = Problems(data["pid"], data["title"], data["category"], data["description"], data["value"])
		if "hint" in data: insert.hint = data["hint"]
		if "autogen" in data: insert.autogen = data["autogen"]
		if "bonus" in data: insert.bonus = data["bonus"]
		if "threshold" in data: insert.threshold = data["threshold"]
		if "weightmap" in data: insert.weightmap = data["weightmap"]
		db.session.add(insert)
		db.session.commit()

	return True

def get_problem(title=None, pid=None):
	match = {}
	if title != None:
		match.update({ "title": title })
	elif pid != None:
		match.update({ "pid": pid })
	with app.app_context():
		result = Problems.query.filter_by(**match)
		return result