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use {
    crate::error::{DittoError, ErrorKind},
    ::serde::{de::DeserializeOwned, Deserialize, Serialize},
};

use core::ops::Deref;

#[derive(Serialize, Deserialize, Debug)]
#[serde(deny_unknown_fields)]
pub struct DittoRgaStoredFormat {
    _value: Vec<serde_json::Value>,
    #[serde(rename = "_ditto_internal_type_jkb12973t4b")]
    _type: u64,
}

#[derive(Debug, Clone, PartialEq, Deserialize, Serialize, Default)]
#[serde(from = "Vec<serde_json::Value>")]
#[serde(into = "DittoRgaStoredFormat")]
/// Represents a CRDT Replicated Growable Array (RGA) that can be
/// upserted as part of a document or assigned to a property during an
/// update of a document.
pub struct DittoRga {
    pub value: Vec<serde_json::Value>,
}

impl From<Vec<serde_json::Value>> for DittoRga {
    fn from(value: Vec<serde_json::Value>) -> DittoRga {
        DittoRga { value }
    }
}

impl From<DittoRga> for DittoRgaStoredFormat {
    fn from(DittoRga { value }: DittoRga) -> DittoRgaStoredFormat {
        Self {
            _value: value,
            _type: ::ffi_sdk::DittoCrdtType::Rga as u64,
        }
    }
}

/// Deref to access vector features
impl Deref for DittoRga {
    type Target = Vec<serde_json::Value>;

    fn deref(&self) -> &Self::Target {
        &self.value
    }
}

impl DittoRga {
    /// Create a new empty Rga
    #[deprecated(
        note = "DittoRga usage should be replaced. Use arrays inside DittoRegisters instead"
    )]
    pub fn new() -> Self {
        Self::default()
    }

    /// Push a value to the Rga
    /// The operation may fail if the value can not be deserialized
    pub fn push<T: Serialize>(&'_ mut self, value: T) -> Result<&'_ mut Self, DittoError> {
        self.value.push(serde_json::to_value(value)?);
        Ok(self)
    }

    /// Pop a value off the end of the RGA.
    pub(super) fn pop(&mut self) {
        self.value.pop();
    }

    /// Remove a value at the specified index.
    pub(super) fn remove(&mut self, index: usize) -> Result<(), DittoError> {
        if index >= self.value.len() {
            return Err(DittoError::from_str(
                ErrorKind::InvalidInput,
                "Provided index to not exists",
            ));
        }
        self.value.remove(index);
        Ok(())
    }

    /// Inserts a value into the RGA at the index specified.
    pub(super) fn insert<T: Serialize>(
        &mut self,
        index: usize,
        value: T,
    ) -> Result<(), DittoError> {
        if index >= self.value.len() {
            return Err(DittoError::from_str(
                ErrorKind::InvalidInput,
                "Provided index to not exists",
            ));
        }

        let value = serde_json::to_value(value)?;
        self.value.insert(index, value);
        Ok(())
    }

    /// Retrieve value at given index.
    /// The operation may fail if the content of the Rga can not be serialized into T
    pub fn get<T: DeserializeOwned>(&self, index: usize) -> Result<T, DittoError> {
        self.value
            .get(index)
            .ok_or_else(|| {
                DittoError::from_str(ErrorKind::InvalidInput, "Provided index to not exists")
            })
            .and_then(|v| serde_json::from_value(v.clone()).map_err(|json_err| json_err.into()))
    }
}