#!/usr/bin/env python3
#   Copyright © 2023  Lee Yingtong Li (RunasSudo)
#
#   This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU Affero General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU Affero General Public License for more details.
#
#   You should have received a copy of the GNU Affero General Public License
#   along with this program.  If not, see <https://www.gnu.org/licenses/>.

import itertools
import sqlite3

# Open database
con = sqlite3.connect('database.db')
con.row_factory = sqlite3.Row
cur = con.cursor()

# Populate pbs_restriction.criteria_rendered
# sql.js is too slow to do the database JOINs at runtime

class Operator:
	def __init__(self, operator, nodes):
		self.operator = operator
		self.nodes = nodes
	
	def flatten(self):
		# If contains just 1 element, return it as itself, not as an Operator
		if len(self.nodes) == 1:
			return self.nodes[0]
		
		# Otherwise flatten recursively
		flattened = [n.flatten() if isinstance(n, Operator) else n for n in self.nodes]
		return Operator(self.operator, flattened)
	
	@staticmethod
	def render(op):
		if isinstance(op, str):
			return '<p>' + op + '</p>'
		elif isinstance(op, Operator):
			if len(op.nodes) == 1:
				# Single simple string
				return '<p>' + op.nodes[0] + '</p>'
			if not any(isinstance(n, Operator) for n in op.nodes):
				# All simple strings
				return '<ul><li><p>' + ', <i>{}</i></p></li><li><p>'.format({'all': 'AND', 'any': 'OR', 'one-of': 'OR'}[op.operator]).join(n.rstrip('.') for n in op.nodes) + '</p></li></ul>'
			else:
				# Mix of Operator +/- simple strings
				return '<p><i>{}</i></p>'.format({'all': 'AND', 'any': 'OR', 'one-of': 'OR'}[op.operator]).join(Operator.render(n) for n in op.nodes)
		else:
			# Must be a list of a single item
			return Operator.render(op[0])

cur.execute('SELECT * FROM pbs_restriction INNER JOIN pbs_restriction_criteria ON pbs_restriction.code = pbs_restriction_criteria.restriction_code INNER JOIN pbs_criteria ON pbs_restriction_criteria.criteria_code = pbs_criteria.code INNER JOIN pbs_criteria_parameter ON pbs_criteria.code = pbs_criteria_parameter.criteria_code')
flat_parameters = cur.fetchall()

parameters_by_restriction = itertools.groupby(flat_parameters, lambda p: p['restriction_code'])
for restriction_code, restriction_parameters in parameters_by_restriction:
	restriction_parameters = list(restriction_parameters)
	
	# Build tree of nodes representing parameters
	restriction_operator = Operator(restriction_parameters[0]['criteria_operator'], [])
	
	parameters_by_criteria = itertools.groupby(restriction_parameters, lambda p: p['criteria_code'])
	for criteria_code, criteria_parameters in parameters_by_criteria:
		criteria_parameters = list(criteria_parameters)
		criteria_operator = Operator(criteria_parameters[0]['parameters_operator'], [p['text'] for p in criteria_parameters])
		restriction_operator.nodes.append(criteria_operator)
	
	# Flatten and render the tree
	restriction_operator = restriction_operator.flatten()
	rendered = Operator.render(restriction_operator)
	
	cur.execute('UPDATE pbs_restriction SET criteria_rendered = ? WHERE code = ?', (rendered, restriction_code))

con.commit()