use crate::common::errors::DomainError;

#[derive(Debug, Clone, PartialEq, Eq, Hash, serde::Serialize, serde::Deserialize)]
pub struct Username(String);

impl Username {
    pub fn new(value: impl Into<String>) -> Result<Self, DomainError> {
        let value = value.into();
        if value.len() < 2 || value.len() > 64 {
            return Err(DomainError::Validation(
                "Username must be 2-64 characters".into(),
            ));
        }
        if !value
            .chars()
            .all(|c| c.is_alphanumeric() || c == '_' || c == '-' || c == '.')
        {
            return Err(DomainError::Validation(
                "Username may only contain alphanumeric, underscore, dash, or dot".into(),
            ));
        }
        Ok(Self(value))
    }

    pub fn as_str(&self) -> &str {
        &self.0
    }
}

impl std::fmt::Display for Username {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}