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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt

"""TOML configuration support for coverage.py"""

from __future__ import annotations

import os
import re

from typing import Any, Callable, Dict, Iterable, List, Optional, Tuple, Type, TypeVar

from coverage import env
from coverage.exceptions import ConfigError
from coverage.misc import import_third_party, substitute_variables
from coverage.types import TConfigSectionOut, TConfigValueOut


if env.PYVERSION >= (3, 11, 0, "alpha", 7):
    import tomllib      # pylint: disable=import-error
    has_tomllib = True
else:
    # TOML support on Python 3.10 and below is an install-time extra option.
    tomllib, has_tomllib = import_third_party("tomli")


class TomlDecodeError(Exception):
    """An exception class that exists even when toml isn't installed."""
    pass


TWant = TypeVar("TWant")

class TomlConfigParser:
    """TOML file reading with the interface of HandyConfigParser."""

    # This class has the same interface as config.HandyConfigParser, no
    # need for docstrings.
    # pylint: disable=missing-function-docstring

    def __init__(self, our_file: bool) -> None:
        self.our_file = our_file
        self.data: Dict[str, Any] = {}

    def read(self, filenames: Iterable[str]) -> List[str]:
        # RawConfigParser takes a filename or list of filenames, but we only
        # ever call this with a single filename.
        assert isinstance(filenames, (bytes, str, os.PathLike))
        filename = os.fspath(filenames)

        try:
            with open(filename, encoding='utf-8') as fp:
                toml_text = fp.read()
        except OSError:
            return []
        if has_tomllib:
            try:
                self.data = tomllib.loads(toml_text)
            except tomllib.TOMLDecodeError as err:
                raise TomlDecodeError(str(err)) from err
            return [filename]
        else:
            has_toml = re.search(r"^\[tool\.coverage(\.|])", toml_text, flags=re.MULTILINE)
            if self.our_file or has_toml:
                # Looks like they meant to read TOML, but we can't read it.
                msg = "Can't read {!r} without TOML support. Install with [toml] extra"
                raise ConfigError(msg.format(filename))
            return []

    def _get_section(self, section: str) -> Tuple[Optional[str], Optional[TConfigSectionOut]]:
        """Get a section from the data.

        Arguments:
            section (str): A section name, which can be dotted.

        Returns:
            name (str): the actual name of the section that was found, if any,
                or None.
            data (str): the dict of data in the section, or None if not found.

        """
        prefixes = ["tool.coverage."]
        for prefix in prefixes:
            real_section = prefix + section
            parts = real_section.split(".")
            try:
                data = self.data[parts[0]]
                for part in parts[1:]:
                    data = data[part]
            except KeyError:
                continue
            break
        else:
            return None, None
        return real_section, data

    def _get(self, section: str, option: str) -> Tuple[str, TConfigValueOut]:
        """Like .get, but returns the real section name and the value."""
        name, data = self._get_section(section)
        if data is None:
            raise ConfigError(f"No section: {section!r}")
        assert name is not None
        try:
            value = data[option]
        except KeyError:
            raise ConfigError(f"No option {option!r} in section: {name!r}") from None
        return name, value

    def _get_single(self, section: str, option: str) -> Any:
        """Get a single-valued option.

        Performs environment substitution if the value is a string. Other types
        will be converted later as needed.
        """
        name, value = self._get(section, option)
        if isinstance(value, str):
            value = substitute_variables(value, os.environ)
        return name, value

    def has_option(self, section: str, option: str) -> bool:
        _, data = self._get_section(section)
        if data is None:
            return False
        return option in data

    def real_section(self, section: str) -> Optional[str]:
        name, _ = self._get_section(section)
        return name

    def has_section(self, section: str) -> bool:
        name, _ = self._get_section(section)
        return bool(name)

    def options(self, section: str) -> List[str]:
        _, data = self._get_section(section)
        if data is None:
            raise ConfigError(f"No section: {section!r}")
        return list(data.keys())

    def get_section(self, section: str) -> TConfigSectionOut:
        _, data = self._get_section(section)
        return data or {}

    def get(self, section: str, option: str) -> Any:
        _, value = self._get_single(section, option)
        return value

    def _check_type(
        self,
        section: str,
        option: str,
        value: Any,
        type_: Type[TWant],
        converter: Optional[Callable[[Any], TWant]],
        type_desc: str,
    ) -> TWant:
        """Check that `value` has the type we want, converting if needed.

        Returns the resulting value of the desired type.
        """
        if isinstance(value, type_):
            return value
        if isinstance(value, str) and converter is not None:
            try:
                return converter(value)
            except Exception as e:
                raise ValueError(
                    f"Option [{section}]{option} couldn't convert to {type_desc}: {value!r}"
                ) from e
        raise ValueError(
            f"Option [{section}]{option} is not {type_desc}: {value!r}"
        )

    def getboolean(self, section: str, option: str) -> bool:
        name, value = self._get_single(section, option)
        bool_strings = {"true": True, "false": False}
        return self._check_type(name, option, value, bool, bool_strings.__getitem__, "a boolean")

    def _get_list(self, section: str, option: str) -> Tuple[str, List[str]]:
        """Get a list of strings, substituting environment variables in the elements."""
        name, values = self._get(section, option)
        values = self._check_type(name, option, values, list, None, "a list")
        values = [substitute_variables(value, os.environ) for value in values]
        return name, values

    def getlist(self, section: str, option: str) -> List[str]:
        _, values = self._get_list(section, option)
        return values

    def getregexlist(self, section: str, option: str) -> List[str]:
        name, values = self._get_list(section, option)
        for value in values:
            value = value.strip()
            try:
                re.compile(value)
            except re.error as e:
                raise ConfigError(f"Invalid [{name}].{option} value {value!r}: {e}") from e
        return values

    def getint(self, section: str, option: str) -> int:
        name, value = self._get_single(section, option)
        return self._check_type(name, option, value, int, int, "an integer")

    def getfloat(self, section: str, option: str) -> float:
        name, value = self._get_single(section, option)
        if isinstance(value, int):
            value = float(value)
        return self._check_type(name, option, value, float, float, "a float")
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