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use super::{chunk_header::*, chunk_type::*, *};
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3
use alloc::string::ToString;
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///Operation Error (ERROR) (9)
6
///
7
///An endpoint sends this chunk to its peer endpoint to notify it of
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///certain error conditions.  It contains one or more error causes.  An
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///Operation Error is not considered fatal in and of itself, but may be
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///used with an ERROR chunk to report a fatal condition.  It has the
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///following parameters:
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/// 0                   1                   2                   3
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/// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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///+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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///|   Type = 9    | Chunk  Flags  |           Length              |
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///+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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///|                                                               |
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///|                    one or more Error Causes                   |
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///|                                                               |
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///+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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///Chunk Flags: 8 bits
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///  Set to 0 on transmit and ignored on receipt.
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///Length: 16 bits (unsigned integer)
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///  Set to the size of the chunk in bytes, including the chunk header
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///  and all the Error Cause fields present.
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#[derive(Default, Debug, Clone)]
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pub(crate) struct ChunkError {
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    pub(crate) error_causes: Vec<ErrorCause>,
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}
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/// makes ChunkError printable
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impl fmt::Display for ChunkError {
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    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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        let mut res = vec![self.header().to_string()];
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        for cause in &self.error_causes {
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            res.push(format!(" - {}", cause));
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        }
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        write!(f, "{}", res.join("\n"))
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    }
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}
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impl Chunk for ChunkError {
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    fn header(&self) -> ChunkHeader {
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        ChunkHeader {
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            typ: CT_ERROR,
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            flags: 0,
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            value_length: self.value_length() as u16,
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        }
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    }
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    fn unmarshal(raw: &Bytes) -> Result<Self> {
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        let header = ChunkHeader::unmarshal(raw)?;
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        if header.typ != CT_ERROR {
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            return Err(Error::ErrChunkTypeNotCt);
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        }
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        let value_end = CHUNK_HEADER_SIZE + header.value_length();
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        let mut error_causes = vec![];
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        let mut offset = CHUNK_HEADER_SIZE;
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        while offset + ERROR_CAUSE_HEADER_LENGTH <= value_end {
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            let e = ErrorCause::unmarshal(&raw.slice(offset..value_end))?;
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            offset += e.length();
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            error_causes.push(e);
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        }
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        Ok(ChunkError { error_causes })
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    }
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    fn marshal_to(&self, buf: &mut BytesMut) -> Result<usize> {
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        self.header().marshal_to(buf)?;
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        for ec in &self.error_causes {
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            buf.extend(ec.marshal());
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        }
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        Ok(buf.len())
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    }
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    fn check(&self) -> Result<()> {
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        Ok(())
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    }
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    fn value_length(&self) -> usize {
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        self.error_causes
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            .iter()
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            .fold(0, |length, ec| length + ec.length())
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    }
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    fn as_any(&self) -> &(dyn Any + Send + Sync) {
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        self
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    }
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}