#!/usr/bin/env python
#
# Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
#
# 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.
#

import argparse
import sys
import tempfile

from fragments import FragmentFile
from sdkconfig import SDKConfig
from generation import GenerationModel, TemplateModel, SectionsInfo
from common import LdGenFailure
from pyparsing import ParseException, ParseFatalException


def main():

    argparser = argparse.ArgumentParser(description="ESP-IDF linker script generator")

    argparser.add_argument(
        "--input", "-i",
        help="Linker template file",
        type=argparse.FileType("r"))

    argparser.add_argument(
        "--fragments", "-f",
        type=argparse.FileType("r"),
        help="Input fragment files",
        nargs="+")

    argparser.add_argument(
        "--sections", "-s",
        type=argparse.FileType("r"),
        help="Library sections info")

    argparser.add_argument(
        "--output", "-o",
        help="Output linker script",
        type=str)

    argparser.add_argument(
        "--config", "-c",
        help="Project configuration")

    argparser.add_argument(
        "--kconfig", "-k",
        help="IDF Kconfig file")

    argparser.add_argument(
        "--env", "-e",
        action='append', default=[],
        help='Environment to set when evaluating the config file', metavar='NAME=VAL')

    args = argparser.parse_args()

    input_file = args.input
    fragment_files = [] if not args.fragments else args.fragments
    config_file = args.config
    output_path = args.output
    kconfig_file = args.kconfig
    sections = args.sections

    try:
        sections_infos = SectionsInfo()

        if sections:
            section_info_contents = [s.strip() for s in sections.read().split("\n")]
            section_info_contents = [s for s in section_info_contents if s]
        else:
            section_info_contents = []

        for sections_info_file in section_info_contents:
            with open(sections_info_file) as sections_info_file_obj:
                sections_infos.add_sections_info(sections_info_file_obj)

        generation_model = GenerationModel()

        sdkconfig = SDKConfig(kconfig_file, config_file, args.env)

        for fragment_file in fragment_files:
            try:
                fragment_file = FragmentFile(fragment_file, sdkconfig)
            except (ParseException, ParseFatalException) as e:
                # ParseException is raised on incorrect grammar
                # ParseFatalException is raised on correct grammar, but inconsistent contents (ex. duplicate
                # keys, key unsupported by fragment, unexpected number of values, etc.)
                raise LdGenFailure("failed to parse %s\n%s" % (fragment_file.name, str(e)))
            generation_model.add_fragments_from_file(fragment_file)

        mapping_rules = generation_model.generate_rules(sections_infos)

        script_model = TemplateModel(input_file)
        script_model.fill(mapping_rules)

        with tempfile.TemporaryFile("w+") as output:
            script_model.write(output)
            output.seek(0)
            with open(output_path, "w") as f:  # only create output file after generation has suceeded
                f.write(output.read())
    except LdGenFailure as e:
        print("linker script generation failed for %s\nERROR: %s" % (input_file.name, e))
        sys.exit(1)


if __name__ == "__main__":
    main()