"""
图片配置验证器

验证图片元素的 fit、background、dpi 等参数。
"""

from typing import List
from validators.result import ValidationIssue
import re


def validate_fit_value(fit: str) -> List[ValidationIssue]:
    """
    验证 fit 参数值

    Args:
        fit: fit 参数值

    Returns:
        验证问题列表
    """
    issues = []
    valid_fits = ['stretch', 'contain', 'cover', 'center']

    if fit not in valid_fits:
        issues.append(ValidationIssue(
            level="ERROR",
            message=f"无效的 fit 值: {fit} (支持: {', '.join(valid_fits)})",
            location="",
            code="INVALID_FIT_VALUE"
        ))

    return issues


def validate_background_color(color: str) -> List[ValidationIssue]:
    """
    验证背景颜色格式

    Args:
        color: 颜色字符串

    Returns:
        验证问题列表
    """
    issues = []

    # 检查类型
    if not isinstance(color, str):
        issues.append(ValidationIssue(
            level="ERROR",
            message=f"无效的背景颜色格式: {color} (应为 #RRGGBB 或 #RGB)",
            location="",
            code="INVALID_COLOR_FORMAT"
        ))
        return issues

    pattern = r'^#([0-9A-Fa-f]{3}|[0-9A-Fa-f]{6})$'

    if not re.match(pattern, color):
        issues.append(ValidationIssue(
            level="ERROR",
            message=f"无效的背景颜色格式: {color} (应为 #RRGGBB 或 #RGB)",
            location="",
            code="INVALID_COLOR_FORMAT"
        ))

    return issues


def validate_dpi_value(dpi: int) -> List[ValidationIssue]:
    """
    验证 DPI 值

    Args:
        dpi: DPI 值

    Returns:
        验证问题列表
    """
    issues = []

    # 检查类型
    if not isinstance(dpi, int):
        issues.append(ValidationIssue(
            level="ERROR",
            message=f"DPI 值必须是整数: {dpi}",
            location="",
            code="INVALID_DPI_TYPE"
        ))
        return issues

    if dpi < 72 or dpi > 300:
        issues.append(ValidationIssue(
            level="WARNING",
            message=f"DPI 值可能不合适: {dpi} (建议范围: 72-300)",
            location="",
            code="DPI_OUT_OF_RANGE"
        ))

    return issues