"""Content value object.

This module defines the Content value object for blog post content
with validation for minimum and maximum length constraints.
"""

from dataclasses import dataclass

from app.domain.value_objects.base import ValueObject


@dataclass(frozen=True, slots=True)
class Content(ValueObject[str]):
    """Blog post content value object.

    Wraps and validates blog post content ensuring it meets length
    requirements and is not empty.

    Attributes:
        value: The content string value.
        MIN_LENGTH: Minimum allowed content length (10 characters).
        MAX_LENGTH: Maximum allowed content length (50000 characters).

    Raises:
        ValueError: If content is empty, too short, or too long.

    Example:
        >>> content = Content("This is valid content...")
        >>> print(content.value)
    """

    MIN_LENGTH: int = 10
    MAX_LENGTH: int = 50000

    def _validate(self) -> None:
        """Validate content string.

        Checks that content is a non-empty string within length bounds.

        Raises:
            ValueError: If content fails validation criteria.
        """
        if not isinstance(self.value, str):
            raise ValueError("Content must be a string")
        if not self.value.strip():
            raise ValueError("Content cannot be empty or whitespace")
        if len(self.value) < self.MIN_LENGTH:
            raise ValueError(f"Content must be at least {self.MIN_LENGTH} characters")
        if len(self.value) > self.MAX_LENGTH:
            raise ValueError(f"Content must be at most {self.MAX_LENGTH} characters")