use super::characters::CharacterDataType;
use rocket::http::RawStr;
use rocket::request::FromFormValue;
use serde::Serialize;
use std::str::FromStr;
use thiserror::Error;

/// Validation errors from form submissions.
#[derive(Serialize, Error, Debug, Clone)]
pub enum ValidationError {
    #[error("bad UTF-8 encoding")]
    BadEncoding,

    #[error("invalid game system: {0}")]
    InvalidGameSystem(String),
}

impl<'v> FromFormValue<'v> for CharacterDataType {
    type Error = ValidationError;

    fn from_form_value(form_value: &'v RawStr) -> Result<CharacterDataType, ValidationError> {
        let system = form_value
            .url_decode()
            .or(Err(ValidationError::BadEncoding))?;

        CharacterDataType::from_str(&system)
            .or_else(|_| Err(ValidationError::InvalidGameSystem(system.to_string())))
    }
}