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//! This module contains all important functions for nbt values

use std::collections::HashMap;

use serde::Serialize;

use crate::traits::SizeOf;
/// Enum storing NBT data
#[derive(Debug, Clone)]
pub enum NbtValue {
    /// Data wrapper to store a signed 8-bit integer
    Byte(i8),
    /// Data wrapper to store a signed 16-bit integer
    Short(i16),
    /// Data wrapper to store a signed 32-bit integer
    Int(i32),
    /// Data wrapper to store a signed 64-bit integer
    Long(i64),
    /// Data wrapper to store a signed 32-bit floating-point value
    Float(f32),
    /// Data wrapper to store a signed 64-bit floating-point value
    Double(f64),
    /// Data wrapper to store a list of signed 8-bit integers
    ByteArray(Vec<i8>),
    /// Data wrapper to store a string
    String(String),
    /// Data wrapper to store a list of NBT values
    List(Vec<NbtValue>),
    /// Data wrapper to store a named list of NBT values
    ///
    /// # Note
    ///
    /// This struct can also have a name
    Compound(Option<String>, HashMap<String, NbtValue>),
    /// Data wrapper to store a list of signed 32-bit integers
    IntArray(Vec<i32>),
    /// Data wrapper to store a list of signed 64-bit integers
    LongArray(Vec<i64>),
}
impl NbtValue {
    pub(crate) fn number_as_be_bytes(&self) -> Option<Vec<u8>> {
        match *self {
            Self::Byte(v) => Some(vec![v as u8]),
            Self::Short(v) => Some(v.to_be_bytes().to_vec()),
            Self::Int(v) => Some(v.to_be_bytes().to_vec()),
            Self::Long(v) => Some(v.to_be_bytes().to_vec()),
            Self::Float(v) => Some(v.to_be_bytes().to_vec()),
            Self::Double(v) => Some(v.to_be_bytes().to_vec()),
            _ => None,
        }
    }
}
impl SizeOf for NbtValue {
    fn size_of(&self) -> usize {
        match self {
            Self::Byte(_) => std::mem::size_of::<i8>(),
            Self::Short(_) => std::mem::size_of::<i16>(),
            Self::Int(_) => std::mem::size_of::<i32>(),
            Self::Long(_) => std::mem::size_of::<i64>(),
            Self::Float(_) => std::mem::size_of::<f32>(),
            Self::Double(_) => std::mem::size_of::<f64>(),
            Self::ByteArray(v) => v.len() * std::mem::size_of::<i8>(),
            Self::IntArray(v) => v.len() * std::mem::size_of::<i32>(),
            Self::LongArray(v) => v.len() * std::mem::size_of::<i64>(),
            Self::String(s) => std::mem::size_of_val(s),
            Self::List(v) => v.iter().map(|v|v.size_of()).sum(),
            Self::Compound(_, values) => values.iter().map(|(k,v)|std::mem::size_of_val(k) + v.size_of()).sum(),
        }
    }
}
/// Function to try to convert any struct implementing [`Serialize`] into [`NbtValue`]
///
/// [`Serialize`]: `serde::Serialize`
/// [`NbtValue`]: `crate::NbtValue`
pub fn to_nbt_value<T>(value: T) -> Result<NbtValue, crate::error::Error>
where
    T: Serialize,
{
    value.serialize(&mut ser::Serializer)
}
pub mod ser;
pub mod de;
pub mod array_serializer;