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use std::io::{Read, Write};
use {Error, Header, types, SectionContent};
use num_traits::{FromPrimitive,ToPrimitive};
use utils::find_or_add_to_strtab;

#[derive(Debug, Default, Clone)]
pub struct Symbol {
    pub shndx:  u16,
    pub value:  u64,
    pub size:   u64,

    pub name:   String,
    pub stype:  types::SymbolType,
    pub bind:   types::SymbolBind,
    pub vis:    types::SymbolVis,
}

impl Symbol {


    fn from_val(
        tab: Option<&Vec<u8>>,
        _name:   u32,
        info:   u8,
        other:  u8,
        shndx:  u16,
        value:  u64,
        size:   u64,
        ) -> Result<Symbol, Error> {

        let name  = match tab {
            Some(s) => String::from_utf8_lossy(
                s[_name as usize ..].split(|c|*c==0).next().unwrap_or(&[0;0])).into_owned(),
            None    => String::default(),
        };

        let reb = info & 0xf;
        let stype = match types::SymbolType::from_u8(reb) {
            Some(v) => v,
            None => return Err(Error::InvalidSymbolType(reb)),
        };

        let reb = info >> 4;
        let bind = match types::SymbolBind::from_u8(reb) {
            Some(v) => v,
            None => return Err(Error::InvalidSymbolBind(reb)),
        };

        let reb = other & 0x3;
        let vis = match types::SymbolVis::from_u8(reb) {
            Some(v) => v,
            None => return Err(Error::InvalidSymbolVis(reb)),
        };

        Ok(Symbol {
            shndx: shndx,
            value: value,
            size:  size,

            name: name,
            stype: stype,
            bind:  bind,
            vis:   vis,
        })
    }

    pub fn entsize(eh: &Header) ->  usize {
        match eh.ident_class {
            types::Class::Class64 => 24,
            types::Class::Class32 => 16,
        }
    }

    pub fn from_reader<R>(mut io: R, linked: Option<&SectionContent>, eh: &Header) -> Result<SectionContent, Error> where R: Read{

        let tab = match linked {
            None => None,
            Some(&SectionContent::Raw(ref s)) => Some(s),
            _ => return Err(Error::LinkedSectionIsNotStrings),
        };

        let mut r = Vec::new();
        let mut b = vec![0; Self::entsize(eh)];
        while io.read(&mut b)? > 0 {
            let mut br = &b[..];
            let _name  = elf_read_u32!(eh, br)?;

            r.push(match eh.ident_class {
                types::Class::Class64 => {
                    let info  = b[4];
                    let other = b[5];
                    br = &b[6..];
                    let shndx = elf_read_u16!(eh, br)?;
                    let value = elf_read_u64!(eh, br)?;
                    let size  = elf_read_u64!(eh, br)?;

                    Symbol::from_val(tab, _name, info, other, shndx, value, size)?
                },
                types::Class::Class32 => {
                    let value = elf_read_u32!(eh, br)?;
                    let size  = elf_read_u32!(eh, br)?;
                    let info  = b[12];
                    let other = b[13];
                    br = &b[14..];
                    let shndx = elf_read_u16!(eh, br)?;

                    Symbol::from_val(tab, _name, info, other, shndx, value as u64, size as u64)?
                },
            })
        }

        Ok(SectionContent::Symbols(r))
    }

    pub fn to_writer<W>(&self, mut io: W, linked: Option<&mut SectionContent>, eh: &Header)
        -> Result<(), Error> where W: Write {

            match linked {
                Some(&mut SectionContent::Raw(ref mut strtab)) => {
                    let off = find_or_add_to_strtab(strtab, self.name.bytes().collect()) as u32;
                    elf_write_u32!(eh, io, off)?;
                },
                _ => elf_write_u32!(eh, io, 0)?,
            }


            let info  = (self.bind.to_u8().unwrap() << 4) + (self.stype.to_u8().unwrap() & 0xf);
            let other = self.vis.to_u8().unwrap();

            match eh.ident_class {
                types::Class::Class64 => {
                    io.write(&[info, other])?;
                    elf_write_u16!(eh, io, self.shndx)?;
                    elf_write_u64!(eh, io, self.value)?;
                    elf_write_u64!(eh, io, self.size)?;
                },
                types::Class::Class32 => {
                    elf_write_u32!(eh, io, self.value as u32)?;
                    elf_write_u32!(eh, io, self.size as u32)?;
                    io.write(&[info, other])?;
                    elf_write_u16!(eh, io, self.shndx)?;
                },
            };
            Ok(())
        }
}