# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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.

from datetime import timedelta
from enum import Enum
from typing import Any, Type

from pypaimon.common.memory_size import MemorySize
from pypaimon.common.time_utils import parse_duration


class OptionsUtils:
    """Utility methods for options conversion and validation."""

    @staticmethod
    def convert_value(value: Any, target_type: Type) -> Any:
        """
        Convert a value to the target type.

        Args:
            value: The value to convert
            target_type: The target type to convert to

        Returns:
            The converted value

        Raises:
            ValueError: If the conversion is not possible
        """
        if value is None:
            return None

        if isinstance(value, target_type):
            return value

        try:
            if issubclass(target_type, Enum):
                return OptionsUtils.convert_to_enum(value, target_type)
        except TypeError:
            pass

        # Handle string conversions
        if target_type == str:
            return OptionsUtils.convert_to_string(value)
        elif target_type == bool:
            return OptionsUtils.convert_to_boolean(value)
        elif target_type == int:
            return OptionsUtils.convert_to_int(value)
        elif target_type == float:
            return OptionsUtils.convert_to_double(value)
        elif target_type == MemorySize:
            return OptionsUtils.convert_to_memory_size(value)
        elif target_type == timedelta:
            return OptionsUtils.convert_to_duration(value)
        else:
            raise ValueError(f"Unsupported type: {target_type}")

    @staticmethod
    def convert_to_string(value: Any) -> str:
        """Convert value to string."""
        return str(value)

    @staticmethod
    def convert_to_boolean(value: Any) -> bool:
        """Convert value to boolean."""
        if isinstance(value, bool):
            return value
        if isinstance(value, str):
            lower_value = value.lower().strip()
            if lower_value in ('true', '1', 'yes', 'on'):
                return True
            elif lower_value in ('false', '0', 'no', 'off'):
                return False
            else:
                raise ValueError(f"Cannot convert '{value}' to boolean")
        elif isinstance(value, (int, float)):
            return bool(value)
        else:
            raise ValueError(f"Cannot convert {type(value)} to boolean")

    @staticmethod
    def convert_to_int(value: Any) -> int:
        """Convert value to integer."""
        if isinstance(value, int):
            return value
        if isinstance(value, str):
            return int(value.strip())
        if isinstance(value, float):
            return int(value)
        raise ValueError(f"Cannot convert {type(value)} to int")

    @staticmethod
    def convert_to_long(value: Any) -> int:
        """Convert value to long (same as int in Python)."""
        return OptionsUtils.convert_to_int(value)

    @staticmethod
    def convert_to_double(value: Any) -> float:
        """Convert value to double (float in Python)."""
        if isinstance(value, float):
            return value
        if isinstance(value, str):
            return float(value.strip())
        if isinstance(value, int):
            return float(value)
        raise ValueError(f"Cannot convert {type(value)} to float")

    @staticmethod
    def convert_to_memory_size(value: Any) -> MemorySize:
        """Convert value to MemorySize."""
        if isinstance(value, MemorySize):
            return value
        if isinstance(value, str):
            return MemorySize.parse(value)
        raise ValueError(f"Cannot convert {type(value)} to MemorySize")

    @staticmethod
    def convert_to_duration(value: Any) -> timedelta:
        if isinstance(value, timedelta):
            return value
        if isinstance(value, str):
            milliseconds = parse_duration(value)
            return timedelta(milliseconds=milliseconds)
        raise ValueError(f"Cannot convert {type(value)} to timedelta")

    @staticmethod
    def convert_to_enum(value: Any, enum_class: Type[Enum]) -> Enum:

        if isinstance(value, enum_class):
            return value

        if isinstance(value, str):
            value_lower = value.lower().strip()
            for enum_member in enum_class:
                if enum_member.value.lower() == value_lower:
                    return enum_member
            try:
                return enum_class[value.upper()]
            except KeyError:
                raise ValueError(
                    f"Cannot convert '{value}' to {enum_class.__name__}. "
                    f"Valid values: {[e.value for e in enum_class]}"
                )
        elif isinstance(value, Enum):
            for enum_member in enum_class:
                if enum_member.value == value.value:
                    return enum_member
            raise ValueError(
                f"Cannot convert {value} (from {type(value).__name__}) to {enum_class.__name__}"
            )
        else:
            raise ValueError(f"Cannot convert {type(value)} to {enum_class.__name__}")