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extern crate byteorder;

use std::fmt;
use std::fmt::{Debug, Display, Formatter};

use self::byteorder::{BigEndian, ByteOrder};

use crate::{CodePairValue, DxfError, DxfResult, Handle};

use crate::helper_functions::parse_hex_string;

/// The basic primitive of a DXF file; a code indicating the type of the data contained, and the
/// data itself.
#[derive(Clone)]
#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
pub struct CodePair {
    pub code: i32,
    pub value: CodePairValue,
    pub offset: usize,
}

impl CodePair {
    pub fn new(code: i32, value: CodePairValue, offset: usize) -> Self {
        CodePair {
            code,
            value,
            offset,
        }
    }
    pub fn new_str(code: i32, val: &str) -> Self {
        CodePair::new(code, CodePairValue::Str(val.to_string()), 0)
    }
    pub fn new_string(code: i32, val: &str) -> Self {
        CodePair::new(code, CodePairValue::Str(val.to_string()), 0)
    }
    pub fn new_binary(code: i32, val: Vec<u8>) -> Self {
        CodePair::new(code, CodePairValue::Binary(val), 0)
    }
    pub fn new_i16(code: i32, val: i16) -> Self {
        CodePair::new(code, CodePairValue::Short(val), 0)
    }
    pub fn new_f64(code: i32, val: f64) -> Self {
        CodePair::new(code, CodePairValue::Double(val), 0)
    }
    pub fn new_i64(code: i32, val: i64) -> Self {
        CodePair::new(code, CodePairValue::Long(val), 0)
    }
    pub fn new_i32(code: i32, val: i32) -> Self {
        CodePair::new(code, CodePairValue::Integer(val), 0)
    }
    pub fn new_bool(code: i32, val: bool) -> Self {
        CodePair::new(code, CodePairValue::Boolean(if val { 1 } else { 0 }), 0)
    }
    pub fn assert_bool(&self) -> DxfResult<bool> {
        match self.value {
            CodePairValue::Boolean(s) => Ok(s != 0),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
    pub fn assert_i64(&self) -> DxfResult<i64> {
        match self.value {
            CodePairValue::Long(l) => Ok(l),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
    pub fn assert_i32(&self) -> DxfResult<i32> {
        match self.value {
            CodePairValue::Integer(i) => Ok(i),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
    pub fn assert_f64(&self) -> DxfResult<f64> {
        match self.value {
            CodePairValue::Double(f) => Ok(f),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
    pub fn assert_string(&self) -> DxfResult<String> {
        match self.value {
            CodePairValue::Str(ref s) => Ok(s.clone()),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
    pub fn assert_binary(&self) -> DxfResult<Vec<u8>> {
        match self.value {
            CodePairValue::Binary(ref b) => Ok(b.clone()),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
    pub fn assert_i16(&self) -> DxfResult<i16> {
        match self.value {
            CodePairValue::Boolean(s) => Ok(s),
            CodePairValue::Short(s) => Ok(s),
            _ => Err(DxfError::WrongValueType(self.offset)),
        }
    }
}

impl CodePair {
    pub(crate) fn as_handle(&self) -> DxfResult<Handle> {
        let mut bytes = vec![];
        parse_hex_string(&self.assert_string()?.trim(), &mut bytes, self.offset)?;
        while bytes.len() < 8 {
            bytes.insert(0, 0);
        }
        Ok(Handle(BigEndian::read_u64(&bytes)))
    }
}

impl Debug for CodePair {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        write!(f, "[@{}]{}/{:?}", self.offset, self.code, &self.value)
    }
}

impl Display for CodePair {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        write!(f, "{}/{}", self.code, &self.value)
    }
}

impl PartialEq for CodePair {
    fn eq(&self, other: &CodePair) -> bool {
        // not comparing offsets
        self.code == other.code && self.value == other.value
    }
}

#[cfg(test)]
mod tests {
    use crate::{CodePair, Handle};

    #[test]
    fn as_handle() {
        assert_eq!(Handle(0x00), CodePair::new_str(0, "0").as_handle().unwrap());
        assert_eq!(Handle(0x01), CodePair::new_str(0, "1").as_handle().unwrap());
        assert_eq!(
            Handle(0xABCD),
            CodePair::new_str(0, "ABCD").as_handle().unwrap()
        );
        assert_eq!(
            Handle(0xABCDABCD),
            CodePair::new_str(0, "ABCDABCD").as_handle().unwrap()
        );
        assert_eq!(
            Handle(0xABCDABCDABCDABCD),
            CodePair::new_str(0, "ABCDABCDABCDABCD")
                .as_handle()
                .unwrap()
        );
        assert_eq!(
            Handle(0xAB),
            CodePair::new_str(0, "  AB  ").as_handle().unwrap()
        );
    }

    #[test]
    fn impl_debug() {
        assert_eq!("[@0]0/str", format!("{:?}", CodePair::new_str(0, "str")));
    }

    #[test]
    fn impl_display() {
        assert_eq!("0/str", format!("{}", CodePair::new_str(0, "str")));
    }
}