import { z } from 'zod';
/**
* Creates a standardized error message for validation failures.
* @param fieldName The name of the field that failed validation.
* @param reason The reason for the validation failure.
* @returns A formatted error message string.
*/
export const createErrorMessage = (fieldName: string, reason: string): string =>
`${fieldName}が無効です: ${reason}`;
/**
* Common Zod validators for frequently used patterns.
*/
export const commonValidators = {
/**
* Validates that a string is not empty.
* @param fieldName The name of the field for error messages.
* @returns A Zod string schema that checks for non-emptiness.
*/
nonEmptyString: (fieldName: string) =>
z.string().min(1, { message: createErrorMessage(fieldName, '空にできません') }),
/**
* Validates that a string is a valid UUID.
* @param fieldName The name of the field for error messages.
* @returns A Zod string schema that checks for UUID format.
*/
uuidField: (fieldName: string) =>
z.string().uuid({ message: createErrorMessage(fieldName, 'UUIDフォーマットではありません') }),
/**
* Validates that a string is a valid ISO 8601 date string.
* @param fieldName The name of the field for error messages.
* @returns A Zod string schema that checks for ISO 8601 date format.
*/
isoDateField: (fieldName: string) =>
z.string().datetime({ message: createErrorMessage(fieldName, 'ISO 8601形式の日付ではありません') }),
/**
* Validates that an array of strings contains only valid tags
* (lowercase letters, numbers, hyphens).
* @param fieldName The name of the field for error messages.
* @returns A Zod array schema for tags.
*/
tagsArray: (fieldName: string) =>
z.array(
z.string()
// Check for non-empty first, then check the format
.min(1, { message: createErrorMessage(fieldName, 'タグは空にできません') })
.regex(/^[a-z0-9-]+$/, { message: createErrorMessage(fieldName, 'タグは小文字英数字とハイフンのみ使用可能です') })
).optional(),
};
