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use libc::c_int;
use std::ffi::CStr;
use super::common::MKTAG;
use crate::ffi;

#[allow(non_snake_case)]
pub const fn AVERROR(e: u32) -> c_int {
    -(e as c_int)
}

#[allow(non_snake_case)]
pub const fn AVUNERROR(e: u32) -> c_int {
    -(e as c_int)
}

macro_rules! FFERRTAG {
	($a:expr, $b:expr, $c:expr, $d:expr) =>
		(-(MKTAG($a, $b, $c, $d) as c_int))
}

pub const AVERROR_BSF_NOT_FOUND: c_int      = FFERRTAG!(0xF8, b'B', b'S', b'F');
pub const AVERROR_BUG: c_int                = FFERRTAG!(b'B', b'U', b'G', b'!');
pub const AVERROR_BUFFER_TOO_SMALL: c_int   = FFERRTAG!(b'B', b'U', b'F', b'S');
pub const AVERROR_DECODER_NOT_FOUND: c_int  = FFERRTAG!(0xF8, b'D', b'E', b'C');
pub const AVERROR_DEMUXER_NOT_FOUND: c_int  = FFERRTAG!(0xF8, b'D', b'E', b'M');
pub const AVERROR_ENCODER_NOT_FOUND: c_int  = FFERRTAG!(0xF8, b'E', b'N', b'C');
pub const AVERROR_EOF: c_int                = FFERRTAG!(b'E', b'O', b'F', b' ');
pub const AVERROR_EXIT: c_int               = FFERRTAG!(b'E', b'X', b'I', b'T');
pub const AVERROR_EXTERNAL: c_int           = FFERRTAG!(b'E', b'X', b'T', b' ');
pub const AVERROR_FILTER_NOT_FOUND: c_int   = FFERRTAG!(0xF8, b'F', b'I', b'L');
pub const AVERROR_INVALIDDATA: c_int        = FFERRTAG!(b'I', b'N', b'D', b'A');
pub const AVERROR_MUXER_NOT_FOUND: c_int    = FFERRTAG!(0xF8, b'M', b'U', b'X');
pub const AVERROR_OPTION_NOT_FOUND: c_int   = FFERRTAG!(0xF8, b'O', b'P', b'T');
pub const AVERROR_PATCHWELCOME: c_int       = FFERRTAG!(b'P', b'A', b'W', b'E');
pub const AVERROR_PROTOCOL_NOT_FOUND: c_int = FFERRTAG!(0xF8, b'P', b'R', b'O');

pub const AVERROR_STREAM_NOT_FOUND: c_int   = FFERRTAG!(0xF8, b'S', b'T', b'R');

pub const AVERROR_BUG2: c_int               = FFERRTAG!(b'B', b'U', b'G', b' ');
pub const AVERROR_UNKNOWN: c_int            = FFERRTAG!(b'U', b'N', b'K', b'N');


pub const AVERROR_HTTP_BAD_REQUEST: c_int   = FFERRTAG!(0xF8, b'4', b'0', b'0');
pub const AVERROR_HTTP_UNAUTHORIZED: c_int  = FFERRTAG!(0xF8, b'4', b'0', b'1');
pub const AVERROR_HTTP_FORBIDDEN: c_int     = FFERRTAG!(0xF8, b'4', b'0', b'3');
pub const AVERROR_HTTP_NOT_FOUND: c_int     = FFERRTAG!(0xF8, b'4', b'0', b'4');
pub const AVERROR_HTTP_OTHER_4XX: c_int     = FFERRTAG!(0xF8, b'4', b'X', b'X');
pub const AVERROR_HTTP_SERVER_ERROR: c_int  = FFERRTAG!(0xF8, b'5', b'X', b'X');

pub const AV_ERROR_MAX_STRING_SIZE: usize   = 64;

/// This function should not be called before the horsemen are ready.
/// Fill the provided buffer with a string containing an error string
/// corresponding to the AVERROR code errnum.
///
/// @param errbuf         a buffer
/// @param errbuf_size    size in bytes of errbuf
/// @param errnum         error code to describe
/// @return the buffer in input, filled with the error description
/// @see av_strerror()
///
/// # Safety
/// Safety requirements is the same as the  av_strerror()`
pub unsafe fn av_make_error_string(
    errbuf: *mut libc::c_char,
    errbuf_size: libc::size_t,
    errnum: libc::c_int
) -> *mut libc::c_char {
    #[cfg(target_arch="x86")]
    let errbuf_size = errbuf_size as u32;
    #[cfg(not(target_arch="x86"))]
    let errbuf_size = errbuf_size as u64;
    ffi::av_strerror(errnum, errbuf, errbuf_size);
    errbuf
}

pub fn av_err2str(
    errnum: libc::c_int
) -> String {
    let mut errbuf = [0u8; AV_ERROR_MAX_STRING_SIZE];
    let errbuf_ptr = errbuf.as_mut_ptr() as _;
    unsafe { av_make_error_string(errbuf_ptr, AV_ERROR_MAX_STRING_SIZE, errnum); }
    unsafe { CStr::from_ptr(errbuf_ptr) }.to_string_lossy().into()
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_err2str() {
        assert_eq!(&av_err2str(AVERROR(ffi::EINVAL)), "Invalid argument");
        assert_eq!(&av_err2str(AVERROR(ffi::EAGAIN)), "Resource temporarily unavailable");
        assert_eq!(&av_err2str(AVERROR(ffi::ENOMEM)), "Cannot allocate memory");
        assert_eq!(&av_err2str(AVERROR_EOF), "End of file");
    }
}