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// Copyright 2023 Fondazione LINKS

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.



use indexmap::IndexMap;
use serde::{Deserialize, Serialize};
use serde_json::Value;


use crate::flattening::json_value_flattening;

use super::payloads::Payloads;

#[derive(Clone, Debug, Default, PartialEq, Eq, Deserialize, Serialize)]
pub struct Claims (pub Vec<String>);

/** These claims are taken from the JWT RFC (https://tools.ietf.org/html/rfc7519) 
 * making the hypothesis that in the future will be used also for the JPTs **/

#[derive(Clone, Debug, Default, PartialEq, Eq, Deserialize, Serialize)]
pub struct JptClaims {

    /// Apparently the "iss" that in JWT was a claim, now should be an issuer protected header parameter 
    /** Apparently the "aud" that in JWT was a claim, now should be an presentation protected header parameter 
      * (https://datatracker.ietf.org/doc/html/draft-ietf-jose-json-web-proof#name-presentation-protected-head) **/
    
    /// Subject of the JPT.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub sub: Option<String>,
    /// Expiration time
    #[serde(skip_serializing_if = "Option::is_none")]
    pub exp: Option<i64>,
    /// Time before which the JPT MUST NOT be accepted
    #[serde(skip_serializing_if = "Option::is_none")]
    pub nbf: Option<i64>,
    /// Issue time
    #[serde(skip_serializing_if = "Option::is_none")]
    pub iat: Option<i64>,
    /// Unique ID for the JPT.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub jti: Option<String>,
    // Other claims (age, name, surname, ...)
    // #[serde(flatten, skip_serializing_if = "Option::is_none")]
    // pub custom: Option<Value>
    #[serde(flatten)]
    pub custom: IndexMap<String, Value>
}


impl JptClaims {

    pub fn new() -> Self {
        Self { 
            sub: None,
            exp: None, 
            nbf: None, 
            iat: None, 
            jti: None, 
            custom: IndexMap::new() }
    }

    pub fn set_sub(&mut self, value: String) {
        self.sub = Some(value);
    }

    pub fn set_exp(&mut self, value: i64) {
        self.exp = Some(value);
    }

    pub fn set_nbf(&mut self, value: i64) {
        self.nbf = Some(value);
    }

    pub fn set_iat(&mut self, value: i64) {
        self.iat = Some(value);
    }

    pub fn set_jti(&mut self, value: String) {
        self.jti = Some(value);
    }

    pub fn add_claim<T: Serialize>(&mut self, claim: &str, value: T, flattened: bool) {
        let serde_value = serde_json::to_value(value).unwrap();
        if flattened {
            self.custom.extend(json_value_flattening(serde_value));
            // json_value_flattening(serde_value).iter().for_each(|(k, v)| self.custom.insert(k, v))
        } else {
            self.custom.insert(claim.to_owned(), serde_value);
        }
        
    }

    /// Extracts claims and payloads into separate vectors.
    pub fn get_claims_and_payloads(&self) -> (Claims, Payloads){

        let jptclaims_json_value = serde_json::to_value(self).unwrap();
        let claim_payloads_pairs = json_value_flattening(jptclaims_json_value);     
        // let flattened = Flattener::new()
        // .set_key_separator(".")
        // .set_array_formatting(ArrayFormatting::Surrounded {
        //     start: "[".to_string(),
        //     end: "]".to_string()
        // })
        // .set_preserve_empty_arrays(false)
        // .set_preserve_empty_objects(false)
        // .flatten(&jptclaims_json_value).unwrap();

        // println!("flattened: {}", flattened);

        
        // let claim_payload_pairs: IndexMap<String, Value> = serde_json::from_value::<IndexMap<String, Value>>(flattened.clone()).unwrap();

        let (keys, values): (Vec<String>, Vec<Value>) = claim_payloads_pairs.into_iter().unzip();

        (Claims(keys), Payloads::new_from_values(values))
        
    }


    // pub fn from_attributes(attributes: BTreeMap<String, String>) -> Result<JptClaims, serde_json::Error> {
    //     let mut claims = JptClaims::default();

    //     for (key, value) in attributes {
    //         match key.as_str() {
    //             "sub" => claims.sub = Some(value),
    //             "exp" => claims.exp = Some(value.parse::<i64>().unwrap_or(0)), // Handle parsing errors
    //             "nbf" => claims.nbf = Some(value.parse::<i64>().unwrap_or(0)), // Handle parsing errors
    //             "iat" => claims.iat = Some(value.parse::<i64>().unwrap_or(0)), // Handle parsing errors
    //             "jti" => claims.jti = Some(value),
    //             _ => {
    //                 // Parse custom claims as JSON strings
    //                 if claims.custom.is_none() {
    //                     claims.custom = Some(Value::Object(Default::default()));
    //                 }

    //                 if let Some(custom) = claims.custom.as_mut() {
    //                     if let Value::Object(custom_object) = custom {
    //                         custom_object.insert(key, serde_json::from_str(&value)?);
    //                     }
    //                 }
    //             }
    //         }
    //     }

    //     Ok(claims)
    // }
  
}