wow-alchemy-data 0.2.0

use custom_debug::Debug;
use wow_alchemy_data_derive::{WowHeaderR, WowHeaderW};

use crate::{
    error::{Result, WowDataError},
    v_read_chunk_items,
};
pub use std::io::{Read, Seek, SeekFrom, Write};

mod wow_alchemy_data {
    pub use crate::*;
}

pub type MagicStr = [u8; 4];

pub trait WowHeaderR: Sized {
    fn wow_read<R: Read + Seek>(reader: &mut R) -> Result<Self>;
}

pub trait WowReaderForHeader<T>
where
    Self: Read + Seek + Sized,
    T: WowHeaderR,
{
    fn wow_read(&mut self) -> Result<T> {
        T::wow_read(self)
    }
}
impl<T, R> WowReaderForHeader<T> for R
where
    T: WowHeaderR,
    R: Read + Seek,
{
}

pub trait DataVersion: Copy + PartialEq + Eq + PartialOrd + Ord {}

pub trait VWowHeaderR<V: DataVersion>: Sized {
    fn wow_read<R: Read + Seek>(reader: &mut R, version: V) -> Result<Self>;
}

pub trait VWowReaderForHeader<V, T>
where
    Self: Read + Seek + Sized,
    V: DataVersion,
    T: VWowHeaderR<V>,
{
    fn wow_read_versioned(&mut self, version: V) -> Result<T> {
        T::wow_read(self, version)
    }
}
impl<V, T, R> VWowReaderForHeader<V, T> for R
where
    V: DataVersion,
    T: VWowHeaderR<V>,
    R: Read + Seek,
{
}

pub trait WowHeaderW {
    fn wow_write<W: Write>(&self, writer: &mut W) -> Result<()>;
    fn wow_size(&self) -> usize;
}

pub trait WowWriterForHeader<T>
where
    Self: Write + Sized,
    T: WowHeaderW,
{
    fn wow_write(&mut self, value: &T) -> Result<()> {
        value.wow_write(self)?;
        Ok(())
    }
}
impl<T, W> WowWriterForHeader<T> for W
where
    T: WowHeaderW,
    W: Write,
{
}

pub trait WowHeaderConversible<V>
where
    Self: WowHeaderW + Sized,
    V: DataVersion,
{
    fn wow_write_version<W: Write>(&self, writer: &mut W, version: V) -> Result<()> {
        let converted = self.wow_convert(version)?;
        converted.wow_write(writer)
    }
    fn wow_convert(&self, to_version: V) -> Result<Self>;
}

pub trait VWowWriterForHeader<V, T>
where
    Self: Write + Sized,
    V: DataVersion,
    T: WowHeaderConversible<V>,
{
    fn wow_write_versioned(&mut self, value: &T, version: V) -> Result<()> {
        value.wow_write_version(self, version)?;
        Ok(())
    }
}
impl<V, T, W> VWowWriterForHeader<V, T> for W
where
    V: DataVersion,
    T: WowHeaderConversible<V>,
    W: Write,
{
}

pub trait WowDataR<T: WowHeaderR>: Sized {
    fn new_from_header<R: Read + Seek>(reader: &mut R, header: &T) -> Result<Self>;
}

pub trait WowReaderForData<H, T>
where
    Self: Read + Seek + Sized,
    H: WowHeaderR,
    T: WowDataR<H>,
{
    fn new_from_header(&mut self, header: &H) -> Result<T> {
        T::new_from_header(self, header)
    }
}
impl<H, T, R> WowReaderForData<H, T> for R
where
    H: WowHeaderR,
    T: WowDataR<H>,
    R: Read + Seek,
{
}

pub trait VWowDataR<V, T>
where
    Self: Sized,
    V: DataVersion,
    T: VWowHeaderR<V>,
{
    fn new_from_header<R: Read + Seek>(reader: &mut R, header: &T) -> Result<Self>;
}

pub trait VWowReaderForData<V, H, T>
where
    Self: Read + Seek + Sized,
    V: DataVersion,
    H: VWowHeaderR<V>,
    T: VWowDataR<V, H>,
{
    fn v_new_from_header(&mut self, header: &H) -> Result<T> {
        T::new_from_header(self, header)
    }
}
impl<V, H, T, R> VWowReaderForData<V, H, T> for R
where
    V: DataVersion,
    H: VWowHeaderR<V>,
    T: VWowDataR<V, H>,
    R: Read + Seek,
{
}

pub trait WowStructR: Sized {
    fn wow_read<R: Read + Seek>(reader: &mut R) -> Result<Self>;
}

pub trait VWowStructR<V: DataVersion>: Sized {
    fn wow_read<R: Read + Seek>(reader: &mut R, version: V) -> Result<Self>;
}

pub trait WowStructW {
    fn wow_write<W: Write + Seek>(&self, writer: &mut W) -> Result<()>;
}

pub trait WowChunkR: Sized {
    fn wow_read_from_chunk<R: Read + Seek>(
        reader: &mut R,
        chunk_header: &ChunkHeader,
    ) -> Result<Vec<Self>>;
}

impl<W> WowChunkR for W
where
    W: WowHeaderR + WowHeaderW,
{
    fn wow_read_from_chunk<R: Read + Seek>(
        reader: &mut R,
        chunk_header: &ChunkHeader,
    ) -> Result<Vec<Self>> {
        let first: W = reader.wow_read()?;
        let item_size = first.wow_size();
        let items = chunk_header.bytes as usize / item_size;

        let rest = chunk_header.bytes as usize % item_size;
        if rest > 0 {
            dbg!(format!(
                "chunk items size mismatch: chunk={} item_size={}, items={}, rest={}",
                String::from_utf8_lossy(&chunk_header.magic),
                item_size,
                items,
                rest
            ));
        }

        let mut vec = Vec::<W>::with_capacity(items);
        vec.push(first);

        for _ in 1..items {
            vec.push(reader.wow_read()?);
        }

        reader.seek_relative(rest as i64)?;

        Ok(vec)
    }
}

pub trait WowReaderForChunk<T>
where
    Self: Read + Seek + Sized,
    T: WowChunkR,
{
    fn wow_read_from_chunk(&mut self, chunk_header: &ChunkHeader) -> Result<Vec<T>> {
        T::wow_read_from_chunk(self, chunk_header)
    }
}
impl<T, R> WowReaderForChunk<T> for R
where
    T: WowChunkR,
    R: Read + Seek,
{
}

#[derive(Debug, Clone)]
pub struct VersionedChunk<V: DataVersion, T> {
    pub version: V,
    pub items: Vec<T>,
}

pub trait VWowChunkR<V: DataVersion>: Sized {
    fn wow_read_from_chunk<R: Read + Seek>(
        reader: &mut R,
        chunk_header: &ChunkHeader,
    ) -> Result<VersionedChunk<V, Self>>;
}

impl<V, W> VWowChunkR<V> for W
where
    V: DataVersion + TryFrom<MagicStr, Error = WowDataError>,
    W: VWowHeaderR<V> + WowHeaderW,
{
    fn wow_read_from_chunk<R: Read + Seek>(
        reader: &mut R,
        chunk_header: &ChunkHeader,
    ) -> Result<VersionedChunk<V, Self>> {
        let version: V = chunk_header.magic.try_into()?;

        Ok(VersionedChunk {
            version,
            items: v_read_chunk_items!(reader, version, chunk_header, Self),
        })
    }
}

pub trait VWowReaderForChunk<V, T>
where
    Self: Read + Seek + Sized,
    V: DataVersion,
    T: VWowChunkR<V>,
{
    fn v_wow_read_from_chunk(
        &mut self,
        chunk_header: &ChunkHeader,
    ) -> Result<VersionedChunk<V, T>> {
        T::wow_read_from_chunk(self, chunk_header)
    }
}
impl<V, T, R> VWowReaderForChunk<V, T> for R
where
    V: DataVersion,
    T: VWowChunkR<V>,
    R: Read + Seek,
{
}

pub struct WowArrayIter<'a, T, R>
where
    T: WowHeaderR + WowHeaderW,
    R: Read + Seek,
{
    reader: &'a mut R,
    initial_reader_pos: u64,
    current: u32,
    array: WowArray<T>,
    item_size: usize,
}

impl<'a, T, R> WowArrayIter<'a, T, R>
where
    T: WowHeaderR + WowHeaderW,
    R: Read + Seek,
{
    pub fn new(reader: &'a mut R, array: WowArray<T>) -> Result<Self> {
        Ok(Self {
            reader,
            initial_reader_pos: array.offset as u64,
            current: 0,
            array,
            item_size: 0,
        })
    }

    /// Returns `Ok(true)` if there are items remaining or `Ok(false)` if not.
    /// This iterator needs at least one item to get the `item_size`, so it will
    /// read the first item and call `f` with `Some(item)` the first time and `None`
    /// from then on. It's the user's responsibility to read the subsequent items.
    /// The reader will always be at the correct offset for reading an item at the
    /// closure execution start
    /// When an Err is returned, it's no longer safe to call this function again
    pub fn next<F>(&mut self, mut f: F) -> Result<bool>
    where
        F: FnMut(&mut R, Option<T>) -> Result<()>,
    {
        if self.current >= self.array.count {
            return Ok(false);
        }

        let current = self.current;
        self.current += 1;

        let seek_pos = self.initial_reader_pos + (current as usize * self.item_size) as u64;
        self.reader.seek(SeekFrom::Start(seek_pos))?;

        let item = if self.item_size == 0 {
            let item: T = self.reader.wow_read()?;
            self.item_size = item.wow_size();
            // rewind just in case the user tries to read the item again
            self.reader.seek(SeekFrom::Start(seek_pos))?;
            Some(item)
        } else {
            None
        };

        match f(self.reader, item) {
            Ok(_) => Ok(true),
            Err(err) => Err(err),
        }
    }
}

#[derive(Debug, Default, PartialEq, WowHeaderR, WowHeaderW)]
pub struct WowArray<T>
where
    T: WowHeaderR + WowHeaderW,
{
    pub count: u32,
    pub offset: u32,
    #[wow_data(override_read = std::marker::PhantomData)]
    _phantom: std::marker::PhantomData<T>,
}

impl<T> Clone for WowArray<T>
where
    T: WowHeaderR + WowHeaderW,
{
    fn clone(&self) -> Self {
        Self {
            count: self.count,
            offset: self.offset,
            _phantom: std::marker::PhantomData,
        }
    }
}

impl<T> WowArray<T>
where
    T: WowHeaderR + WowHeaderW,
{
    pub fn new(count: u32, offset: u32) -> Self {
        Self {
            count,
            offset,
            _phantom: std::marker::PhantomData,
        }
    }

    pub fn is_empty(&self) -> bool {
        self.count == 0
    }

    pub fn add_offset(&mut self, offset: usize) {
        self.offset += offset as u32;
    }

    pub fn new_iterator<'a, R: Read + Seek>(
        &self,
        reader: &'a mut R,
    ) -> Result<WowArrayIter<'a, T, R>> {
        WowArrayIter::new(reader, self.clone())
    }
}

impl<T> WowArray<T>
where
    T: WowHeaderR + WowHeaderW,
{
    pub fn wow_read_to_vec<R: Read + Seek>(&self, reader: &mut R) -> Result<Vec<T>> {
        if self.is_empty() {
            return Ok(Vec::new());
        }

        reader
            .seek(SeekFrom::Start(self.offset as u64))
            .map_err(WowDataError::Io)?;

        let mut result = Vec::with_capacity(self.count as usize);
        for _ in 0..self.count {
            result.push(T::wow_read(reader)?);
        }

        Ok(result)
    }
}

impl<T> WowArray<WowArray<T>>
where
    T: WowHeaderR + WowHeaderW,
{
    pub fn wow_read_to_vec_r<R: Read + Seek>(&self, reader: &mut R) -> Result<Vec<Vec<T>>> {
        if self.is_empty() {
            return Ok(Vec::new());
        }

        reader
            .seek(SeekFrom::Start(self.offset as u64))
            .map_err(WowDataError::Io)?;

        let mut result = Vec::with_capacity(self.count as usize);
        for _ in 0..self.count {
            let single: WowArray<T> = reader.wow_read()?;
            let item_end_position = reader.stream_position()?;
            result.push(single.wow_read_to_vec(reader)?);
            reader.seek(SeekFrom::Start(item_end_position))?;
        }

        Ok(result)
    }
}

pub type WowCharArray = WowArray<u8>;

pub trait WowString {
    fn from_wow_char_array<R: Read + Seek>(
        reader: &mut R,
        wow_char_array: WowCharArray,
    ) -> Result<String>;
    fn write_wow_char_array<W: Write + Seek>(&self, writer: &mut W) -> Result<WowCharArray>;
}

#[derive(Debug, PartialEq, WowHeaderW)]
pub struct WowArrayV<V, T>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
{
    pub count: u32,
    pub offset: u32,

    #[wow_data(override_read = std::marker::PhantomData)]
    _phantom: std::marker::PhantomData<T>,
    #[wow_data(override_read = std::marker::PhantomData)]
    _version: std::marker::PhantomData<V>,
}

impl<V, T> Clone for WowArrayV<V, T>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
{
    fn clone(&self) -> Self {
        Self {
            count: self.count,
            offset: self.offset,
            _phantom: std::marker::PhantomData,
            _version: std::marker::PhantomData,
        }
    }
}

impl<V, T> VWowHeaderR<V> for WowArrayV<V, T>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
{
    fn wow_read<R: Read + Seek>(reader: &mut R, _version: V) -> Result<Self> {
        Ok(Self {
            count: reader.wow_read()?,
            offset: reader.wow_read()?,
            _phantom: std::marker::PhantomData,
            _version: std::marker::PhantomData,
        })
    }
}

impl<V, T> Default for WowArrayV<V, T>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
{
    fn default() -> Self {
        Self {
            count: 0,
            offset: 0,
            _phantom: std::marker::PhantomData,
            _version: std::marker::PhantomData,
        }
    }
}

pub struct WowArrayVIter<'a, V, T, R>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
    R: Read + Seek,
{
    reader: &'a mut R,
    version: V,
    initial_reader_pos: u64,
    current: u32,
    array: WowArrayV<V, T>,
    item_size: usize,
}

impl<'a, V, T, R> WowArrayVIter<'a, V, T, R>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
    R: Read + Seek,
{
    pub fn new(reader: &'a mut R, version: V, array: WowArrayV<V, T>) -> Result<Self> {
        Ok(Self {
            reader,
            version,
            initial_reader_pos: array.offset as u64,
            current: 0,
            array,
            item_size: 0,
        })
    }

    /// Returns `Ok(true)` if there are items remaining or `Ok(false)` if not.
    /// This iterator needs at least one item to get the `item_size`, so it will
    /// read the first item and call `f` with `Some(item)` the first time and `None`
    /// from then on. It's the user's responsibility to read the subsequent items.
    /// The reader will always be at the correct offset for reading an item at the
    /// closure execution start
    /// When an Err is returned, it's no longer safe to call this function again
    pub fn next<F>(&mut self, mut f: F) -> Result<bool>
    where
        F: FnMut(&mut R, Option<T>) -> Result<()>,
    {
        if self.current >= self.array.count {
            return Ok(false);
        }

        let current = self.current;
        self.current += 1;

        let seek_pos = self.initial_reader_pos + (current as usize * self.item_size) as u64;
        self.reader.seek(SeekFrom::Start(seek_pos))?;

        let item = if self.item_size == 0 {
            let item: T = self.reader.wow_read_versioned(self.version)?;
            self.item_size = item.wow_size();
            // rewind just in case the user tries to read the item again
            self.reader.seek(SeekFrom::Start(seek_pos))?;
            Some(item)
        } else {
            None
        };

        match f(self.reader, item) {
            Ok(_) => Ok(true),
            Err(err) => Err(err),
        }
    }
}

impl<V, T> WowArrayV<V, T>
where
    V: DataVersion,
    T: VWowHeaderR<V> + WowHeaderW,
{
    pub fn is_empty(&self) -> bool {
        self.count == 0
    }

    pub fn add_offset(&mut self, offset: usize) {
        self.offset += offset as u32;
    }

    pub fn wow_read_to_vec<R: Read + Seek>(&self, reader: &mut R, version: V) -> Result<Vec<T>> {
        if self.is_empty() {
            return Ok(Vec::new());
        }

        reader
            .seek(SeekFrom::Start(self.offset as u64))
            .map_err(WowDataError::Io)?;

        let mut result = Vec::with_capacity(self.count as usize);
        for _ in 0..self.count {
            result.push(T::wow_read(reader, version)?);
        }

        Ok(result)
    }

    pub fn new_iterator<'a, R: Read + Seek>(
        &self,
        reader: &'a mut R,
        version: V,
    ) -> Result<WowArrayVIter<'a, V, T, R>> {
        WowArrayVIter::new(reader, version, self.clone())
    }
}

pub trait WowVec<T: WowHeaderR + WowHeaderW> {
    fn wow_write<W: Write + Seek>(&self, writer: &mut W) -> Result<WowArray<T>>;
}

#[derive(Debug, Clone, Copy, PartialEq, Default, WowHeaderR, WowHeaderW)]
pub struct C4Vector {
    pub x: f32,
    pub y: f32,
    pub z: f32,
    pub w: f32,
}

impl C4Vector {
    pub fn new(x: f32, y: f32, z: f32, w: f32) -> Self {
        Self { x, y, z, w }
    }

    pub fn to_glam(&self) -> glam::Vec4 {
        glam::Vec4::new(self.x, self.y, self.z, self.w)
    }

    pub fn from_glam(v: glam::Vec4) -> Self {
        Self {
            x: v.x,
            y: v.y,
            z: v.z,
            w: v.w,
        }
    }

    pub fn origin() -> Self {
        Self {
            x: 0.,
            y: 0.,
            z: 0.,
            w: 0.,
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Default, WowHeaderR, WowHeaderW)]
pub struct C3Vector {
    pub x: f32,
    pub y: f32,
    pub z: f32,
}

impl C3Vector {
    pub fn new(x: f32, y: f32, z: f32) -> Self {
        Self { x, y, z }
    }

    pub fn to_glam(&self) -> glam::Vec3 {
        glam::Vec3::new(self.x, self.y, self.z)
    }

    pub fn from_glam(v: glam::Vec3) -> Self {
        Self {
            x: v.x,
            y: v.y,
            z: v.z,
        }
    }

    pub fn origin() -> Self {
        Self {
            x: 0.,
            y: 0.,
            z: 0.,
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Default, WowHeaderR, WowHeaderW)]
pub struct C2Vector {
    pub x: f32,
    pub y: f32,
}

impl C2Vector {
    pub fn new(x: f32, y: f32) -> Self {
        Self { x, y }
    }

    pub fn to_glam(&self) -> glam::Vec2 {
        glam::Vec2::new(self.x, self.y)
    }

    pub fn from_glam(v: glam::Vec2) -> Self {
        Self { x: v.x, y: v.y }
    }
}

#[derive(Debug, Clone, Default, PartialEq, WowHeaderR, WowHeaderW)]
pub struct BoundingBox {
    pub min: C3Vector,
    pub max: C3Vector,
}

impl BoundingBox {
    pub fn new(min: C3Vector, max: C3Vector) -> Self {
        Self { min, max }
    }

    pub fn zero() -> Self {
        Self::new(C3Vector::origin(), C3Vector::origin())
    }
}

#[derive(Debug, Clone, Copy, PartialEq, WowHeaderR, WowHeaderW)]
pub struct Quaternion {
    pub x: f32,
    pub y: f32,
    pub z: f32,
    pub w: f32,
}

impl Quaternion {
    pub fn to_glam(&self) -> glam::Quat {
        glam::Quat::from_xyzw(self.x, self.y, self.z, self.w)
    }

    pub fn from_glam(q: glam::Quat) -> Self {
        Self {
            x: q.x,
            y: q.y,
            z: q.z,
            w: q.w,
        }
    }
}

#[inline]
pub fn i16_to_f32(value: i16) -> f32 {
    (value as f32 / i16::MAX as f32) - 1.0
}

impl From<Quaternion16> for Quaternion {
    fn from(value: Quaternion16) -> Self {
        Self {
            x: i16_to_f32(value.x),
            y: i16_to_f32(value.y),
            z: i16_to_f32(value.z),
            w: i16_to_f32(value.w),
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, WowHeaderR, WowHeaderW)]
pub struct Quaternion16 {
    pub x: i16,
    pub y: i16,
    pub z: i16,
    pub w: i16,
}

#[derive(Debug, Clone, Copy, PartialEq, WowHeaderR, WowHeaderW)]
pub struct Color {
    pub r: f32,
    pub g: f32,
    pub b: f32,
}

#[derive(Debug, Clone, Copy, PartialEq, WowHeaderR, WowHeaderW)]
pub struct ColorA {
    pub r: f32,
    pub g: f32,
    pub b: f32,
    pub a: f32,
}

impl ColorA {
    pub fn new(r: f32, g: f32, b: f32, a: f32) -> Self {
        Self { r, g, b, a }
    }

    pub fn white() -> Self {
        Self::new(1.0, 1.0, 1.0, 1.0)
    }

    pub fn black() -> Self {
        Self::new(0.0, 0.0, 0.0, 1.0)
    }

    pub fn transparent() -> Self {
        Self::new(0.0, 0.0, 0.0, 0.0)
    }
}

impl WowHeaderR for [ColorA; 3] {
    fn wow_read<R: Read + Seek>(reader: &mut R) -> Result<Self> {
        Ok([reader.wow_read()?, reader.wow_read()?, reader.wow_read()?])
    }
}
impl WowHeaderW for [ColorA; 3] {
    fn wow_write<W: Write>(&self, writer: &mut W) -> Result<()> {
        writer.wow_write(&self[0])?;
        writer.wow_write(&self[1])?;
        writer.wow_write(&self[2])?;
        Ok(())
    }

    fn wow_size(&self) -> usize {
        0_f32.wow_size() * 4 * 3
    }
}

#[derive(Debug, Clone, WowHeaderR, WowHeaderW)]
pub struct VectorFp6_9 {
    pub x: u16,
    pub y: u16,
}

impl WowHeaderR for [VectorFp6_9; 2] {
    fn wow_read<R: Read + Seek>(reader: &mut R) -> Result<Self> {
        Ok([reader.wow_read()?, reader.wow_read()?])
    }
}
impl WowHeaderW for [VectorFp6_9; 2] {
    fn wow_write<W: Write>(&self, writer: &mut W) -> Result<()> {
        writer.wow_write(&self[0])?;
        writer.wow_write(&self[1])?;
        Ok(())
    }

    fn wow_size(&self) -> usize {
        0_u16.wow_size() * 2 * 2
    }
}

#[derive(Debug, Clone, Default)]
pub struct Mat3x4 {
    pub items: [C4Vector; 3],
}

impl WowHeaderR for Mat3x4 {
    fn wow_read<R: Read + Seek>(reader: &mut R) -> Result<Self> {
        Ok(Self {
            items: [
                C4Vector::wow_read(reader)?,
                C4Vector::wow_read(reader)?,
                C4Vector::wow_read(reader)?,
            ],
        })
    }
}

impl WowHeaderW for Mat3x4 {
    fn wow_write<W: Write>(&self, writer: &mut W) -> Result<()> {
        writer.wow_write(&self.items[0])?;
        writer.wow_write(&self.items[1])?;
        writer.wow_write(&self.items[2])?;
        Ok(())
    }

    fn wow_size(&self) -> usize {
        self.items[0].wow_size() * 3
    }
}

#[derive(Debug, Clone, Default, WowHeaderR, WowHeaderW)]
pub struct ChunkHeader {
    pub magic: MagicStr,
    pub bytes: u32,
}

#[cfg(test)]
mod tests {
    use wow_alchemy_data_derive::{WowEnumFrom, WowHeaderR, WowHeaderW};

    use super::*;
    use std::io::Cursor;

    #[test]
    fn test_u32_read_write() {
        let data = [0x05, 0x20, 0x00, 0x00];
        let mut cursor = Cursor::new(data);

        let u32_val: u32 = cursor.wow_read().unwrap();
        assert_eq!(u32_val, 0x00002005);

        let mut data = Vec::new();
        let mut writer = Cursor::new(&mut data);
        writer.wow_write(&0x30002100_u32).unwrap();
        assert_eq!(data, [0x00, 0x21, 0x00, 0x30]);
    }

    #[test]
    fn test_u16_read_write() {
        let data = [0x13, 0x43, 0x00, 0x00];
        let mut cursor = Cursor::new(data);

        let u16val: u16 = cursor.wow_read().unwrap();
        assert_eq!(u16val, 0x4313);

        let u16val: u16 = cursor.wow_read().unwrap();
        assert_eq!(u16val, 0x0000);

        let mut data = Vec::new();
        let mut writer = Cursor::new(&mut data);
        writer.wow_write(&0x0330_u16).unwrap();
        assert_eq!(data, [0x30, 0x03]);
    }

    #[test]
    fn test_c3vector_parse() {
        let data = [
            0x00, 0x00, 0x80, 0x3F, // x = 1.0
            0x00, 0x00, 0x00, 0x40, // y = 2.0
            0x00, 0x00, 0x40, 0x40, // z = 3.0
        ];

        let mut cursor = Cursor::new(data);
        let vector: C3Vector = cursor.wow_read().unwrap();

        assert_eq!(vector.x, 1.0);
        assert_eq!(vector.y, 2.0);
        assert_eq!(vector.z, 3.0);
    }

    #[test]
    fn test_c2vector_parse() {
        let data = [
            0x00, 0x00, 0x80, 0x3F, // x = 1.0
            0x00, 0x00, 0x00, 0x40, // y = 2.0
        ];

        let mut cursor = Cursor::new(data);
        let vector: C2Vector = cursor.wow_read().unwrap();

        assert_eq!(vector.x, 1.0);
        assert_eq!(vector.y, 2.0);
    }

    #[test]
    fn test_wowarray_parse() {
        let data = [
            0x05, 0x00, 0x00, 0x00, // count = 5
            0x20, 0x30, 0x00, 0x00, // offset = 0x3020
        ];

        let mut cursor = Cursor::new(data);
        let array: WowArray<u32> = cursor.wow_read().unwrap();

        assert_eq!(array.count, 5);
        assert_eq!(array.offset, 0x3020);
    }

    #[test]
    fn test_wowarray_write() {
        let array = WowArray::<u32>::new(5, 0x3020);
        let mut cursor = Cursor::new(Vec::new());

        cursor.wow_write(&array).unwrap();

        let data = cursor.into_inner();
        assert_eq!(
            data,
            [
                0x05, 0x00, 0x00, 0x00, // count = 5
                0x20, 0x30, 0x00, 0x00, // offset = 0x3020
            ]
        );
    }

    #[test]
    fn test_wowarray_to_vec() {
        let data = [
            0x00, 0x00, 0x80, 0x3F, // x = 1.0
            0x00, 0x00, 0x00, 0x40, // y = 2.0
            0x00, 0x00, 0x00, 0x40, // x = 2.0
            0x00, 0x00, 0x80, 0x3F, // y = 1.0
            0x00, 0x00, 0x80, 0x3F, // x = 1.0
            0x00, 0x00, 0x40, 0x40, // y = 3.0
        ];

        let array = WowArray::<C2Vector>::new(3, 0);

        let mut cursor = Cursor::new(data);
        let vec = array.wow_read_to_vec(&mut cursor).unwrap();

        assert_eq!(
            vec,
            vec![
                C2Vector::new(1., 2.),
                C2Vector::new(2., 1.),
                C2Vector::new(1., 3.)
            ]
        );
    }

    #[test]
    fn test_vec_to_wowarray() {
        let mut cursor = Cursor::new(Vec::new());

        cursor.wow_write(&0xB00B5_u32).unwrap();
        cursor.wow_write(&0xDEAD_u16).unwrap();

        let vec = vec![
            C2Vector::new(1., 2.),
            C2Vector::new(2., 1.),
            C2Vector::new(1., 3.),
        ];

        let mut wowarr = vec.wow_write(&mut cursor).unwrap();
        wowarr.add_offset(3);

        assert_eq!(wowarr, WowArray::<C2Vector>::new(3, 9));
    }

    #[allow(clippy::upper_case_acronyms)]
    #[derive(
        super::Debug,
        Clone,
        Copy,
        PartialEq,
        Eq,
        PartialOrd,
        Ord,
        Hash,
        WowEnumFrom,
        WowHeaderR,
        WowHeaderW,
    )]
    #[wow_data(from_type=u32)]
    pub enum M2Version {
        #[wow_data(expr = 1)]
        Classic,
        #[wow_data(expr = 2)]
        TBC,
        #[wow_data(expr = 3)]
        WotLK,
        #[wow_data(expr = 4)]
        Cataclysm,
        #[wow_data(expr = 5)]
        MoP,
        #[wow_data(expr = 6)]
        WoD,
        #[wow_data(expr = 7)]
        Legion,
        #[wow_data(expr = 8)]
        BfA,
    }

    impl DataVersion for M2Version {}

    #[derive(super::Debug, Clone, Copy, WowHeaderR, WowHeaderW)]
    #[wow_data(version = M2Version)]
    enum ExampleVersioned {
        #[wow_data(read_if = version <= M2Version::TBC)]
        UpToTBC(i16, f32),
        Others(u16),
    }

    #[derive(super::Debug, Clone, Copy, WowHeaderR, WowHeaderW)]
    #[wow_data(version = M2Version)]
    enum OptionUpToMoP<T: WowHeaderR + WowHeaderW> {
        #[wow_data(read_if = version <= M2Version::MoP)]
        Some(T),
        None,
    }

    #[derive(super::Debug, Clone, Copy, WowHeaderR, WowHeaderW)]
    #[wow_data(version = M2Version)]
    enum OptionAfterMoP<T: WowHeaderR + WowHeaderW> {
        #[wow_data(read_if = version > M2Version::MoP)]
        Some(T),
        None,
    }

    #[derive(super::Debug, Clone, WowHeaderR, WowHeaderW)]
    #[wow_data(version = M2Version)]
    struct ExampleHeader {
        #[wow_data(override_read = M2Version::Classic)]
        _version: M2Version,
        crc: u32,
        vectors: WowArray<C2Vector>,
        #[wow_data(versioned)]
        versioned_data: ExampleVersioned,
        bounding_box: BoundingBox,
        #[wow_data(versioned)]
        up_to_mop: OptionUpToMoP<i16>,
        #[wow_data(versioned)]
        after_mop: OptionAfterMoP<f32>,
    }

    struct ExampleData {
        header: ExampleHeader,
        vectors: Vec<C2Vector>,
    }

    impl ExampleData {
        fn read<R: Read + Seek>(reader: &mut R, version: u32) -> Result<Self> {
            let version = version.try_into()?;
            let header: ExampleHeader = reader.wow_read_versioned(version)?;
            let vectors = header.vectors.wow_read_to_vec(reader)?;

            Ok(Self { header, vectors })
        }

        fn write<W: Write>(&self, writer: &mut W) -> Result<()> {
            let header_size = self.header.wow_size();

            let mut data_section = Vec::new();
            let mut data_section_writer = Cursor::new(&mut data_section);

            let mut vectors = self.vectors.wow_write(&mut data_section_writer)?;
            vectors.add_offset(header_size);

            let mut new_header = self.header.clone();
            new_header.vectors = vectors;

            writer.wow_write(&new_header)?;
            writer.write_all(&data_section)?;

            Ok(())
        }
    }

    #[test]
    fn test_simple_struct_read_write() {
        let example_data_bin = [
            // header
            0x16, 0x00, 0x00, 0x00, // crc
            0x02, 0x00, 0x00, 0x00, // vectors count
            0x28, 0x00, 0x00, 0x00, // vectors offset
            0x42, 0x00, // ExampleVersioned::Others(66)
            0x00, 0x00, 0x80, 0x3F, // bounding_box.min.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.min.y
            0x00, 0x00, 0x40, 0x40, // bounding_box.min.z
            0x00, 0x00, 0x40, 0x40, // bounding_box.max.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.max.y
            0x00, 0x00, 0x80, 0x3F, // bounding_box.max.z
            0x23, 0x01, // up_to_mop
            // data section
            0x00, 0x00, 0x80, 0x3F, // vectors.0.x
            0x00, 0x00, 0x00, 0x40, // vectors.0.y
            0x00, 0x00, 0x00, 0x40, // vectors.1.x
            0x00, 0x00, 0x80, 0x3F, // vectors.1.y
        ];

        let example_data = ExampleData {
            header: ExampleHeader {
                _version: M2Version::WotLK,
                crc: 22,
                vectors: WowArray::default(),
                versioned_data: ExampleVersioned::Others(66),
                bounding_box: BoundingBox::new(
                    C3Vector::new(1., 2., 3.),
                    C3Vector::new(3., 2., 1.),
                ),
                up_to_mop: OptionUpToMoP::Some(0x123),
                after_mop: OptionAfterMoP::None,
            },
            vectors: vec![C2Vector::new(1., 2.), C2Vector::new(2., 1.)],
        };

        let mut writer = Cursor::new(Vec::new());
        example_data.write(&mut writer).unwrap();

        assert_eq!(*writer.get_ref(), example_data_bin);

        let mut cursor = Cursor::new(&example_data_bin);
        let decoded = ExampleData::read(&mut cursor, example_data.header._version.into()).unwrap();
        let mut dec_writer = Cursor::new(Vec::new());
        decoded.write(&mut dec_writer).unwrap();

        assert_eq!(*dec_writer.get_ref(), example_data_bin);
    }

    struct ExampleDataNoHeader {
        _version: M2Version,
        crc: u32,
        vectors: Vec<C2Vector>,
        versioned_data: ExampleVersioned,
        bounding_box: BoundingBox,
        up_to_mop: OptionUpToMoP<i16>,
        after_mop: OptionAfterMoP<f32>,
    }

    impl ExampleDataNoHeader {
        fn read<R: Read + Seek>(reader: &mut R, version: u32) -> Result<Self> {
            let version = version.try_into()?;
            let header: ExampleHeader = reader.wow_read_versioned(version)?;
            let vectors = header.vectors.wow_read_to_vec(reader)?;

            Ok(Self {
                _version: version,
                crc: header.crc,
                vectors,
                versioned_data: header.versioned_data,
                bounding_box: header.bounding_box,
                up_to_mop: header.up_to_mop,
                after_mop: header.after_mop,
            })
        }
    }

    impl WowHeaderW for ExampleDataNoHeader {
        fn wow_write<W: Write>(&self, writer: &mut W) -> Result<()> {
            let mut new_header = ExampleHeader {
                _version: self._version,
                crc: self.crc,
                vectors: WowArray::default(),
                versioned_data: self.versioned_data,
                bounding_box: self.bounding_box.clone(),
                up_to_mop: self.up_to_mop,
                after_mop: self.after_mop,
            };

            let header_size = new_header.wow_size();

            let mut data_section = Vec::new();
            let mut data_section_writer = Cursor::new(&mut data_section);

            new_header.vectors = self.vectors.wow_write(&mut data_section_writer)?;
            new_header.vectors.add_offset(header_size);

            writer.wow_write(&new_header)?;
            writer.write_all(&data_section)?;

            Ok(())
        }

        fn wow_size(&self) -> usize {
            todo!()
        }
    }

    #[test]
    fn test_simple_struct_no_header_read_write() {
        let example_data_bin = [
            // header
            0x16, 0x00, 0x00, 0x00, // crc
            0x02, 0x00, 0x00, 0x00, // vectors count
            0x2A, 0x00, 0x00, 0x00, // vectors offset
            0x42, 0x00, // ExampleVersioned::Others(66)
            0x00, 0x00, 0x80, 0x3F, // bounding_box.min.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.min.y
            0x00, 0x00, 0x40, 0x40, // bounding_box.min.z
            0x00, 0x00, 0x40, 0x40, // bounding_box.max.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.max.y
            0x00, 0x00, 0x80, 0x3F, // bounding_box.max.z
            0x00, 0x00, 0x80, 0x3F, // after_mop
            // data section
            0x00, 0x00, 0x80, 0x3F, // vectors.0.x
            0x00, 0x00, 0x00, 0x40, // vectors.0.y
            0x00, 0x00, 0x00, 0x40, // vectors.1.x
            0x00, 0x00, 0x80, 0x3F, // vectors.1.y
        ];

        let example_data = ExampleDataNoHeader {
            _version: M2Version::WoD,
            crc: 22,
            versioned_data: ExampleVersioned::Others(66),
            bounding_box: BoundingBox::new(C3Vector::new(1., 2., 3.), C3Vector::new(3., 2., 1.)),
            up_to_mop: OptionUpToMoP::None,
            after_mop: OptionAfterMoP::Some(1.0),
            vectors: vec![C2Vector::new(1., 2.), C2Vector::new(2., 1.)],
        };

        let mut writer = Cursor::new(Vec::new());
        writer.wow_write(&example_data).unwrap();

        assert_eq!(*writer.get_ref(), example_data_bin);

        let mut cursor = Cursor::new(&example_data_bin);
        let decoded = ExampleDataNoHeader::read(&mut cursor, example_data._version.into()).unwrap();
        let mut dec_writer = Cursor::new(Vec::new());
        dec_writer.wow_write(&decoded).unwrap();

        assert_eq!(*dec_writer.get_ref(), example_data_bin);
    }

    impl WowHeaderConversible<M2Version> for ExampleDataNoHeader {
        fn wow_convert(&self, to_version: M2Version) -> Result<Self> {
            match to_version {
                M2Version::Classic | M2Version::TBC => Ok(Self {
                    _version: to_version,
                    crc: self.crc,
                    versioned_data: if self._version <= M2Version::TBC {
                        self.versioned_data
                    } else {
                        ExampleVersioned::UpToTBC(0, 2.0)
                    },
                    bounding_box: self.bounding_box.clone(),
                    up_to_mop: if self._version <= M2Version::MoP {
                        self.up_to_mop
                    } else {
                        OptionUpToMoP::Some(0)
                    },
                    after_mop: OptionAfterMoP::None,
                    vectors: self.vectors.clone(),
                }),
                _ => {
                    if to_version <= M2Version::WoD {
                        Ok(Self {
                            _version: to_version,
                            crc: self.crc,
                            versioned_data: if self._version <= M2Version::TBC {
                                ExampleVersioned::Others(0x49)
                            } else {
                                self.versioned_data
                            },
                            bounding_box: self.bounding_box.clone(),
                            up_to_mop: if to_version > M2Version::MoP {
                                OptionUpToMoP::None
                            } else if self._version <= M2Version::MoP {
                                self.up_to_mop
                            } else {
                                OptionUpToMoP::Some(0)
                            },
                            after_mop: if to_version > M2Version::MoP {
                                if self._version > M2Version::MoP {
                                    self.after_mop
                                } else {
                                    OptionAfterMoP::Some(0.0)
                                }
                            } else {
                                OptionAfterMoP::None
                            },
                            vectors: self.vectors.clone(),
                        })
                    } else {
                        Err(WowDataError::ConversionError {
                            from: self._version.into(),
                            to: to_version.into(),
                            reason: "not supported".into(),
                        })
                    }
                }
            }
        }
    }

    #[test]
    fn test_simple_conversion() {
        let example_data_bin = [
            // header
            0x16, 0x00, 0x00, 0x00, // crc
            0x02, 0x00, 0x00, 0x00, // vectors count
            0x2A, 0x00, 0x00, 0x00, // vectors offset
            0x42, 0x00, // ExampleVersioned::Others(66)
            0x00, 0x00, 0x80, 0x3F, // bounding_box.min.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.min.y
            0x00, 0x00, 0x40, 0x40, // bounding_box.min.z
            0x00, 0x00, 0x40, 0x40, // bounding_box.max.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.max.y
            0x00, 0x00, 0x80, 0x3F, // bounding_box.max.z
            0x00, 0x00, 0x80, 0x3F, // after_mop
            // data section
            0x00, 0x00, 0x80, 0x3F, // vectors.0.x
            0x00, 0x00, 0x00, 0x40, // vectors.0.y
            0x00, 0x00, 0x00, 0x40, // vectors.1.x
            0x00, 0x00, 0x80, 0x3F, // vectors.1.y
        ];

        let mut cursor = Cursor::new(&example_data_bin);
        let decoded = ExampleDataNoHeader::read(&mut cursor, M2Version::WoD.into()).unwrap();
        let mut dec_writer = Cursor::new(Vec::new());
        dec_writer.wow_write(&decoded).unwrap();

        assert_eq!(*dec_writer.get_ref(), example_data_bin);

        let mut converted_writer = Cursor::new(Vec::new());
        converted_writer
            .wow_write_versioned(&decoded, M2Version::Classic)
            .unwrap();

        let example_converted_data_bin = [
            // header
            0x16, 0x00, 0x00, 0x00, // crc
            0x02, 0x00, 0x00, 0x00, // vectors count
            0x2C, 0x00, 0x00, 0x00, // vectors offset
            0x00, 0x00, // ExampleVersioned::UpToTBC.0 = 0
            0x00, 0x00, 0x00, 0x40, // ExampleVersioned::UpToTBC.1 = 2.0
            0x00, 0x00, 0x80, 0x3F, // bounding_box.min.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.min.y
            0x00, 0x00, 0x40, 0x40, // bounding_box.min.z
            0x00, 0x00, 0x40, 0x40, // bounding_box.max.x
            0x00, 0x00, 0x00, 0x40, // bounding_box.max.y
            0x00, 0x00, 0x80, 0x3F, // bounding_box.max.z
            0x00, 0x00, // up_to_mop
            // data section
            0x00, 0x00, 0x80, 0x3F, // vectors.0.x
            0x00, 0x00, 0x00, 0x40, // vectors.0.y
            0x00, 0x00, 0x00, 0x40, // vectors.1.x
            0x00, 0x00, 0x80, 0x3F, // vectors.1.y
        ];

        assert_eq!(*converted_writer.get_ref(), example_converted_data_bin);
    }
}