#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2020-2022 F4PGA Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0

"""

This script extracts the top module cells and their corresponding parameters
from json files produced by Yosys.
The return code of this script is used to check if the output is equivalent.
"""

import sys
import json
import argparse

parameters = ["IOSTANDARD", "DRIVE", "SLEW", "IN_TERM", "IO_LOC_PAIRS"]

def read_cells(json_file):
    with open(json_file) as f:
        data = json.load(f)
    f.close()
    cells = data['modules']['top']['cells']
    cells_parameters = dict()
    for cell, opts in cells.items():
        attributes = opts['parameters']
        if len(attributes.keys()):
            if any([x in parameters for x in attributes.keys()]):
                cells_parameters[cell] = attributes
    return cells_parameters


def main(args):
    cells = read_cells(args.json)
    if args.update:
        with open(args.golden, 'w') as f:
            json.dump(cells, f, indent=2)
    else:
        with open(args.golden) as f:
            cells_golden = json.load(f)
            if cells == cells_golden:
                exit(0)
            else:
                print(json.dumps(cells, indent=4))
                print("VS")
                print(json.dumps(cells_golden, indent=4))
                exit(1)
    f.close()

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('--json', help = 'JSON to compare', required = True)
    parser.add_argument('--golden', help = 'Golden JSON file', required = True)
    parser.add_argument('--update', action = 'store_true', help = 'Update golden reference')
    args = parser.parse_args()
    main(args)