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//! A structure for wav format.

use std::{
    ffi::{CStr, CString},
    mem::MaybeUninit,
};

use crate::{bind, Result, Sdl, SdlError};

/// A wav format buffer.
pub struct Wav {
    buffer: *mut u8,
    len: usize,
}

impl std::fmt::Debug for Wav {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Wav")
            .field("len", &self.len)
            .finish_non_exhaustive()
    }
}

impl Wav {
    /// Constructs a wav buffer from file named `file_name`.
    ///
    /// # Errors
    ///
    /// Returns `Err` if the wav file cannot be opened, uses an unknown data format, or is corrupt.
    ///
    /// # Panics
    ///
    /// Panics if `file_name` contains a null character.
    pub fn new(file_name: &str) -> Result<Self> {
        let read_binary_mode = CStr::from_bytes_with_nul(b"rb\0").unwrap();
        let cstr = CString::new(file_name).expect("file_name must not be empty");
        let mut audio_spec = MaybeUninit::uninit();
        let mut buffer = std::ptr::null_mut();
        let mut len = 0u32;
        let ptr = unsafe {
            bind::SDL_LoadWAV_RW(
                bind::SDL_RWFromFile(cstr.as_ptr(), read_binary_mode.as_ptr()),
                1,
                audio_spec.as_mut_ptr(),
                &mut buffer,
                &mut len,
            )
        };
        if ptr.is_null() {
            Err(SdlError::Others { msg: Sdl::error() })
        } else {
            Ok(Self {
                buffer,
                len: len as usize,
            })
        }
    }

    /// Treats as an `u8` slice.
    #[must_use]
    pub fn as_slice(&self) -> &[u8] {
        unsafe { std::slice::from_raw_parts(self.buffer, self.len) }
    }

    /// Treats as an mutable `u8` slice.
    pub fn as_slice_mut(&mut self) -> &mut [u8] {
        unsafe { std::slice::from_raw_parts_mut(self.buffer, self.len) }
    }

    /// Convert into a vector.
    #[must_use]
    pub fn to_vec(&self) -> Vec<u8> {
        self.as_slice().to_vec()
    }
}

impl AsRef<[u8]> for Wav {
    fn as_ref(&self) -> &[u8] {
        self.as_slice()
    }
}

impl AsMut<[u8]> for Wav {
    fn as_mut(&mut self) -> &mut [u8] {
        self.as_slice_mut()
    }
}

impl Drop for Wav {
    fn drop(&mut self) {
        unsafe { bind::SDL_FreeWAV(self.buffer) }
    }
}