#!/usr/bin/env python3
# Patch's predicate synthesizer
# Copyright (C) 2024  Nguyễn Gia Phong
#
# This file is part of taosc.
#
# Taosc 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.
#
# Taosc 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 taosc.  If not, see <https://www.gnu.org/licenses/>.

from contextlib import redirect_stderr
from os import devnull
from os.path import basename
from pathlib import Path
from sys import argv, stdout

from pacfix import learn
from pacfix.invariant import INVARIANT_MAP, InvariantType
from pacfix.utils import get_live_vars, get_valuations, parse_valuation


def encode(inv, file):
    if inv.inv_type == InvariantType.VAR:
        file.write(f"v{inv.data}")
    elif inv.inv_type == InvariantType.CONST:
        file.write(f"{'n' if inv.data < 0 else 'p'}{abs(inv.data)}")
    else:
        file.write(INVARIANT_MAP[inv.inv_type])
        encode(inv.left, file)
        encode(inv.right, file)


if len(argv) != 3:
    print(f'usage: taosc-synth input-dir delta')
    exit(1)
input_dir = Path(argv[1])
delta = float(argv[2])

with open(input_dir / 'vars') as f: live_vars = get_live_vars(f)
vals_neg, vals_pos = parse_valuation(get_valuations(input_dir / "neg"),
                                     get_valuations(input_dir / "pos"))
with open(devnull, 'w') as f, redirect_stderr(f):
    result = learn(live_vars, vals_neg, vals_pos, delta)
for i in result.inv_mgr.invs:
    encode(i, stdout)
    print()