# Copyright 2024 The Pigweed 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
#
#     https://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.

from __future__ import annotations

import configparser
import dataclasses
import io
import re
from typing import TYPE_CHECKING
import urllib.parse

from PB.recipe_modules.pigweed.checkout.options import (
    Options as CheckoutOptions,
)
from recipe_engine import recipe_api
from RECIPE_MODULES.fuchsia.roll_commit_message import (
    api as roll_commit_message_api,
)

if TYPE_CHECKING:  # pragma: no cover
    from typing import Generator
    from PB.recipe_modules.pigweed.txt_roll.txt_entry import TxtEntry
    from RECIPE_MODULES.pigweed.checkout import api as checkout_api


class CopyRoll(roll_commit_message_api.BaseRoll):

    def __init__(
        self,
        destination_path: str,
        old_value: str,
        new_value: str,
        *args,
        **kwargs,
    ):
        super().__init__(*args, **kwargs)
        self.destination_path = destination_path
        self.old_value = old_value
        self.new_value = new_value

    def short_name(self) -> str:
        return self.destination_path

    def message_header(self, force_summary_version: bool = False) -> str:
        header = self.destination_path
        if force_summary_version:
            return header

        try:
            value_string = self.new_value.strip()
            if '\n' not in value_string:
                new_header = f'{header}: {value_string}'
                if len(new_header) <= 62:
                    header = new_header

        except UnicodeDecodeError:  # pragma: no cover
            pass

        return header

    def message_body(
        self,
        *,
        force_summary_version: bool = False,
        escape_tags: Sequence[str] = (),
        filter_tags: Sequence[str] = (),
    ) -> str:
        result = []
        if (
            '\n' not in str(self.old_value).strip()
            and '\n' not in self.new_value.strip()
        ):
            if self.old_value is None:
                result.append('Initialized to')  # pragma: no cover
            else:
                result.append('From')
                result.append(f'    {self.old_value.strip()}')
                result.append('To')
            result.append(f'    {self.new_value.strip()}')
            result.append('')

        return '\n'.join(result)

    def message_footer(self, *, send_comment: bool) -> str:
        return ''

    def output_property(self) -> dict[str, str]:
        return {
            "path": self.destination_path,
            "old": self.old_value,
            "new": self.new_value,
        }


class CopyRollApi(recipe_api.RecipeApi):

    CopyRoll = CopyRoll

    def update(
        self,
        checkout: checkout_api.CheckoutContext,
        copy_entry: CopyEntry,
    ) -> list[CopyRoll]:
        with self.m.step.nest(copy_entry.destination_path):
            new_revision = self.m.git_roll_util.resolve_new_revision(
                copy_entry.remote,
                copy_entry.branch or 'main',
                checkout.remotes_equivalent,
            )

            parsed_remote = urllib.parse.urlparse(copy_entry.remote)

            destination = checkout.root / copy_entry.destination_path
            self.m.file.ensure_directory(
                f'ensure directory {destination.parent}',
                destination.parent,
            )
            old_value: str | None = None
            self.m.path.mock_add_file(destination)
            if self.m.path.isfile(destination):
                old_value = self.m.file.read_text(
                    f'read destination {copy_entry.destination_path}',
                    destination,
                )

            new_value = self.m.gitiles.fetch(
                host=parsed_remote.netloc,
                project=parsed_remote.path.lstrip('/'),
                ref=new_revision,
                path=copy_entry.source_path,
                step_name=f'read source {copy_entry.source_path}',
            ).decode()

            new = self.m.step.empty(f'new {copy_entry.source_path}')
            new.presentation.step_summary_text = repr(new_value)

            if old_value == new_value:
                pres = self.m.step.empty('values are identical').presentation
                pres.step_summary_text = repr(old_value)
                return []

            self.m.file.write_text(
                f'write destination {copy_entry.destination_path}',
                destination,
                new_value,
            )

            return [
                CopyRoll(
                    destination_path=copy_entry.destination_path,
                    old_value=old_value,
                    new_value=new_value,
                ),
            ]