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use std::io::Read;

use borsh::{BorshDeserialize, BorshSerialize};
use serde::{Deserialize, Serialize};
use serde_json::{Map, Number, Value};

use crate::{commons::errors::SubjectError, DigestIdentifier};

use super::HashId;

/// Wrapper of serde_json::Value implementing serialization and deserialization with Borsh.
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq)]
pub struct ValueWrapper(pub Value);

impl ValueWrapper {
    pub fn as_str(&self) -> Option<&str> {
        self.0.as_str()
    }

    pub fn get(&self, key: &str) -> Option<&Value> {
        self.0.get(key)
    }
}

impl HashId for ValueWrapper {
    fn hash_id(&self) -> Result<DigestIdentifier, SubjectError> {
        DigestIdentifier::from_serializable_borsh(&self)
            .map_err(|_| SubjectError::CryptoError("Hashing error".to_string()))
    }
}

impl BorshSerialize for ValueWrapper {
    #[inline]
    fn serialize<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
        match &self.0 {
            Value::Bool(data) => {
                BorshSerialize::serialize(&0u8, writer)?;
                BorshSerialize::serialize(&data, writer)
            }
            Value::Number(data) => {
                BorshSerialize::serialize(&1u8, writer)?;
                if data.is_f64() {
                    BorshSerialize::serialize(&0u8, writer)?;
                    BorshSerialize::serialize(&data.as_f64().unwrap(), writer)
                } else if data.is_i64() {
                    BorshSerialize::serialize(&1u8, writer)?;
                    BorshSerialize::serialize(&data.as_i64().unwrap(), writer)
                } else if data.is_u64() {
                    BorshSerialize::serialize(&2u8, writer)?;
                    BorshSerialize::serialize(&data.as_u64().unwrap(), writer)
                } else {
                    return Err(std::io::Error::new(
                        std::io::ErrorKind::InvalidData,
                        "Invalid number type",
                    ));
                }
            }
            Value::String(data) => {
                BorshSerialize::serialize(&2u8, writer)?;
                BorshSerialize::serialize(&data, writer)
            }
            Value::Array(data) => {
                BorshSerialize::serialize(&3u8, writer)?;
                BorshSerialize::serialize(&(data.len() as u32), writer)?;
                for element in data {
                    let element = ValueWrapper(element.to_owned());
                    BorshSerialize::serialize(&element, writer)?;
                }
                Ok(())
            }
            Value::Object(data) => {
                BorshSerialize::serialize(&4u8, writer)?;
                BorshSerialize::serialize(&(data.len() as u32), writer)?;
                for (key, value) in data {
                    BorshSerialize::serialize(&key, writer)?;
                    let value = ValueWrapper(value.to_owned());
                    BorshSerialize::serialize(&value, writer)?;
                }
                Ok(())
            }
            Value::Null => BorshSerialize::serialize(&5u8, writer),
        }
    }
}

impl BorshDeserialize for ValueWrapper {
    #[inline]
    fn deserialize_reader<R: Read>(reader: &mut R) -> std::io::Result<Self> {
        let order: u8 = BorshDeserialize::deserialize_reader(reader)?;
        match order {
            0 => {
                let data: bool = BorshDeserialize::deserialize_reader(reader)?;
                Ok(ValueWrapper(Value::Bool(data)))
            }
            1 => {
                let internal_order: u8 = BorshDeserialize::deserialize_reader(reader)?;
                match internal_order {
                    0 => {
                        let data: f64 = BorshDeserialize::deserialize_reader(reader)?;
                        Ok(ValueWrapper(Value::Number(Number::from_f64(data).unwrap())))
                    }
                    1 => {
                        let data: i64 = BorshDeserialize::deserialize_reader(reader)?;
                        Ok(ValueWrapper(Value::Number(Number::from(data))))
                    }
                    2 => {
                        let data: u64 = BorshDeserialize::deserialize_reader(reader)?;
                        Ok(ValueWrapper(Value::Number(Number::from(data))))
                    }
                    _ => {
                        return Err(std::io::Error::new(
                            std::io::ErrorKind::InvalidInput,
                            format!("Invalid Number representation: {}", internal_order),
                        ))
                    }
                }
            }
            2 => {
                let data: String = BorshDeserialize::deserialize_reader(reader)?;
                Ok(ValueWrapper(Value::String(data)))
            }
            3 => {
                let len = u32::deserialize_reader(reader)?;
                if len == 0 {
                    Ok(ValueWrapper(Value::Array(Vec::new())))
                } else {
                    let mut result = Vec::with_capacity(len as usize);
                    for _ in 0..len {
                        result.push(ValueWrapper::deserialize_reader(reader)?.0);
                    }
                    Ok(ValueWrapper(Value::Array(result)))
                }
            }
            4 => {
                let len = u32::deserialize_reader(reader)?;
                let mut result = Map::new();
                for _ in 0..len {
                    let key = String::deserialize_reader(reader)?;
                    let value = ValueWrapper::deserialize_reader(reader)?;
                    result.insert(key, value.0);
                }
                Ok(ValueWrapper(Value::Object(result)))
            }
            5 => Ok(ValueWrapper(Value::Null)),
            _ => Err(std::io::Error::new(
                std::io::ErrorKind::InvalidInput,
                format!("Invalid Value representation: {}", order),
            )),
        }
    }
}

mod tests {
    #[test]
    fn foo() {
        let value: serde_json::Value =
            serde_json::from_str("{\"a\":1, \"b\": \"Buenas Tardes\"}").unwrap();
        let wrapper = super::ValueWrapper(value.clone());
        let bytes1 = bincode::serialize(&value).unwrap();
        let bytes2 = bincode::serialize(&wrapper).unwrap();
        assert_eq!(bytes1, bytes2);
    }
}