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//
// Wildland Project
//
// Copyright © 2023 Golem Foundation
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 as published by
// the Free Software Foundation.
//
// 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 std::marker::PhantomData;

use serde::{Deserialize, Serialize};

pub trait TemplateValidator: Send + Sync {
    fn json_validate(&self, template: serde_json::Value) -> Result<ValidatedTemplateData, String>;
    fn yaml_validate(&self, template: serde_yaml::Value) -> Result<ValidatedTemplateData, String>;
}

pub struct GenericValidator<T: for<'de> Deserialize<'de> + Send + Sync> {
    marker: std::marker::PhantomData<T>,
}

impl<T: for<'de> Deserialize<'de> + Send + Sync> Default for GenericValidator<T> {
    fn default() -> Self {
        Self {
            marker: PhantomData,
        }
    }
}

impl<T: for<'de> Deserialize<'de> + Serialize + Send + Sync> TemplateValidator
    for GenericValidator<T>
{
    fn json_validate(&self, template: serde_json::Value) -> Result<ValidatedTemplateData, String> {
        serde_json::from_value::<T>(template.clone())
            .map(|_| ())
            .map_err(|e| e.to_string())?;
        Ok(ValidatedTemplateData(template))
    }

    fn yaml_validate(&self, template: serde_yaml::Value) -> Result<ValidatedTemplateData, String> {
        let obj = serde_yaml::from_value::<T>(template).map_err(|e| e.to_string())?;
        Ok(ValidatedTemplateData(serde_json::to_value(&obj).unwrap()))
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ValidatedTemplateData(pub serde_json::Value);