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use super::utils::{get_key, Element};
use crate::commons::models::validation::ValidationProof;
use crate::signature::Signature;
use crate::utils::{deserialize, serialize};
use crate::DbError;
use crate::{DatabaseCollection, DatabaseManager, Derivable, DigestIdentifier};
use std::collections::HashSet;
use std::sync::Arc;

pub(crate) struct SignatureDb<C: DatabaseCollection> {
    collection: C,
    prefix: String,
}

impl<C: DatabaseCollection> SignatureDb<C> {
    pub fn new<M: DatabaseManager<C>>(manager: &Arc<M>) -> Self {
        Self {
            collection: manager.create_collection("signature"),
            prefix: "signature".to_string(),
        }
    }

    pub fn get_signatures(
        &self,
        subject_id: &DigestIdentifier,
        sn: u64,
    ) -> Result<(HashSet<Signature>, ValidationProof), DbError> {
        let key_elements: Vec<Element> = vec![
            Element::S(self.prefix.clone()),
            Element::S(subject_id.to_str()),
            Element::N(sn),
        ];
        let key = get_key(key_elements)?;
        let signatures = self.collection.get(&key)?;
        Ok(
            deserialize::<(HashSet<Signature>, ValidationProof)>(&signatures)
                .map_err(|_| DbError::DeserializeError)?,
        )
    }

    pub fn set_signatures(
        &self,
        subject_id: &DigestIdentifier,
        sn: u64,
        signatures: HashSet<Signature>,
        validation_proof: ValidationProof,
    ) -> Result<(), DbError> {
        let key_elements: Vec<Element> = vec![
            Element::S(self.prefix.clone()),
            Element::S(subject_id.to_str()),
            Element::N(sn),
        ];
        let key = get_key(key_elements)?;
        let total_signatures = match self.collection.get(&key) {
            Ok(other) => {
                let (other, _) = deserialize::<(HashSet<Signature>, ValidationProof)>(&other)
                    .map_err(|_| DbError::SerializeError)?;
                signatures.union(&other).cloned().collect()
            }
            Err(DbError::EntryNotFound) => signatures,
            Err(error) => {
                return Err(error);
            }
        };
        let total_signatures = serialize(&(total_signatures, validation_proof))
            .map_err(|_| DbError::SerializeError)?;
        self.collection.put(&key, total_signatures)
    }

    pub fn del_signatures(&self, subject_id: &DigestIdentifier, sn: u64) -> Result<(), DbError> {
        let key_elements: Vec<Element> = vec![
            Element::S(self.prefix.clone()),
            Element::S(subject_id.to_str()),
            Element::N(sn),
        ];
        let key = get_key(key_elements)?;
        self.collection.del(&key)
    }

    pub fn get_validation_proof(
        &self,
        subject_id: &DigestIdentifier,
    ) -> Result<(HashSet<Signature>, ValidationProof), DbError> {
        let key_elements: Vec<Element> = vec![
            Element::S(self.prefix.clone()),
            Element::S(subject_id.to_str()),
        ];
        let key = get_key(key_elements)?;
        let mut iter = self.collection.iter(false, format!("{}{}", key, char::MAX));
        if let Some(vproof) = iter.next() {
            let vproof = deserialize::<(HashSet<Signature>, ValidationProof)>(&vproof.1)
                .map_err(|_| DbError::DeserializeError)?;
            return Ok(vproof);
        } else {
            return Err(DbError::EntryNotFound);
        }
    }
}