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use libc::{c_char, c_int, size_t};

// Note: FFmpeg's AVERROR and AVUNERROR are conditionally defined based on
// whether EDOM is positive, claiming that "Some platforms have E* and errno
// already negated". This can be traced to a commit in 2007 where "some
// platforms" were specifically identified as BeOS (so maybe also Haiku?):
// https://github.com/FFmpeg/FFmpeg/commit/8fa36ae09dddb1b639b4df5d505c0dbcf4e916e4
// constness is more valuable than BeOS support, so if someone really needs it,
// send a patch with cfg_attr.

#[inline(always)]
pub const fn AVERROR(e: c_int) -> c_int {
    -e
}

#[inline(always)]
pub const fn AVUNERROR(e: c_int) -> c_int {
    -e
}

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');

#[inline(always)]
pub unsafe fn av_make_error_string(
    errbuf: *mut c_char,
    errbuf_size: size_t,
    errnum: c_int,
) -> *mut c_char {
    av_strerror(errnum, errbuf, errbuf_size);

    errbuf
}

extern "C" {
    pub fn av_strerror(errnum: c_int, errbuf: *mut c_char, errbuf_size: size_t) -> c_int;
}