/*
 * serde-validate - A library for validating deserialized structs and enums
 *
 * Copyright (C) 2024 Lucas M. de Jong Larrarte
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

use serde_validate::Validate;
use serde_validate::validate_deser;

#[validate_deser]
enum NonEmptyAndNonNegative {
    String { name: String },
    Int(i32),
    Null
}

impl Validate for NonEmptyAndNonNegative {
    type Error = String;
    fn validate(&self) -> Result<(), Self::Error> {
        match self {
            NonEmptyAndNonNegative::String { name } if name.is_empty() => Err("name cannot be empty".to_string()),
            NonEmptyAndNonNegative::Int(i) if *i < 0 => Err("id cannot be negative".to_string()),
            _ => Ok(())
        }
    }
}

#[test]
fn test_deserialize_not_empty() {
    assert!(serde_json::from_str::<NonEmptyAndNonNegative>("{\"String\": {\"name\": \"Lucas\"}}").is_ok());
}

#[test]
fn test_deserialize_empty() {
    assert!(serde_json::from_str::<NonEmptyAndNonNegative>("{\"String\": {\"name\": \"\"}}").is_err());
}

#[test]
fn test_deserialize_negative() {
    assert!(serde_json::from_str::<NonEmptyAndNonNegative>("{\"Int\": -1}").is_err());
}

#[test]
fn test_deserialize_not_negative() {
    assert!(serde_json::from_str::<NonEmptyAndNonNegative>("{\"Int\": 1}").is_ok());
}

#[test]
fn test_deserialize_null() {
    assert!(serde_json::from_str::<NonEmptyAndNonNegative>("{\"Null\": null}").is_ok());
}