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use crate::ffi;
use std::ptr;

use crate::ffi::Dwarf_Off;

use super::Die;
use super::Dwarf;
use super::Result;

#[derive(Debug)]
pub struct CompileUnits<'dw> {
    dwarf: &'dw Dwarf<'dw>,
    offset: Dwarf_Off,
    finished: bool,
}

impl<'dw> CompileUnits<'dw> {
    #[inline]
    pub(crate) fn new(dwarf: &'dw Dwarf<'dw>) -> CompileUnits<'dw> {
        CompileUnits {
            dwarf: dwarf,
            offset: 0,
            finished: false,
        }
    }
}

impl<'dw> Iterator for CompileUnits<'dw> {
    type Item = Result<CompileUnit<'dw>>;

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        if self.finished {
            return None;
        }

        let offset = self.offset;
        let mut header_size = 0;

        let rc = ffi!(dwarf_next_unit(
            self.dwarf.as_ptr(),
            offset,
            &mut self.offset,
            &mut header_size,
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut()
        ));

        match rc {
            Ok(0) => {
                let die_offset = offset + header_size as Dwarf_Off;
                Some(Ok(CompileUnit::new(self.dwarf, die_offset)))
            }
            Ok(_) => {
                self.finished = true;
                None
            }
            Err(e) => {
                self.finished = true;
                Some(Err(e))
            }
        }
    }
}

#[derive(Debug)]
pub struct TypeUnits<'dw> {
    dwarf: &'dw Dwarf<'dw>,
    offset: Dwarf_Off,
    finished: bool,
}

impl<'dw> TypeUnits<'dw> {
    #[inline]
    pub(crate) fn new(dwarf: &'dw Dwarf<'dw>) -> TypeUnits<'dw> {
        TypeUnits {
            dwarf: dwarf,
            offset: 0,
            finished: false,
        }
    }
}

impl<'dw> Iterator for TypeUnits<'dw> {
    type Item = Result<TypeUnit<'dw>>;

    #[inline]
    fn next(&mut self) -> Option<Self::Item> {
        if self.finished {
            return None;
        }

        let offset = self.offset;
        let mut header_size = 0;
        let mut signature = 0;
        let mut type_offset = 0;

        let rc = ffi!(dwarf_next_unit(
            self.dwarf.as_ptr(),
            offset,
            &mut self.offset,
            &mut header_size,
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut(),
            &mut signature,
            &mut type_offset
        ));

        match rc {
            Ok(0) => {
                let die_offset = offset + header_size as Dwarf_Off;
                let type_offset = offset + type_offset;
                Some(Ok(TypeUnit::new(
                    self.dwarf,
                    die_offset,
                    type_offset,
                    signature,
                )))
            }
            Ok(_) => {
                self.finished = true;
                None
            }
            Err(e) => {
                self.finished = true;
                Some(Err(e))
            }
        }
    }
}

#[derive(Debug)]
pub struct CompileUnit<'dw> {
    dwarf: &'dw Dwarf<'dw>,
    die_offset: Dwarf_Off,
}

impl<'dw> CompileUnit<'dw> {
    #[inline]
    fn new(dwarf: &'dw Dwarf<'dw>, die_offset: Dwarf_Off) -> CompileUnit<'dw> {
        CompileUnit {
            dwarf: dwarf,
            die_offset: die_offset,
        }
    }

    #[inline]
    pub fn get_die(&self) -> Result<Die<'dw>> {
        Die::from_offset(self.dwarf, self.die_offset)
    }
}

#[derive(Debug)]
pub struct TypeUnit<'dw> {
    dwarf: &'dw Dwarf<'dw>,
    die_offset: Dwarf_Off,
    type_offset: Dwarf_Off,
    signature: u64,
}

impl<'dw> TypeUnit<'dw> {
    #[inline]
    fn new(
        dwarf: &'dw Dwarf<'dw>,
        die_offset: Dwarf_Off,
        type_offset: Dwarf_Off,
        signature: u64,
    ) -> TypeUnit<'dw> {
        TypeUnit {
            dwarf: dwarf,
            die_offset: die_offset,
            type_offset: type_offset,
            signature: signature,
        }
    }

    #[inline]
    pub fn get_die(&self) -> Result<Die<'dw>> {
        Die::from_type_offset(self.dwarf, self.die_offset)
    }

    #[inline]
    pub fn get_type_die(&self) -> Result<Die<'dw>> {
        Die::from_type_offset(self.dwarf, self.type_offset)
    }

    #[inline]
    pub fn signature(&self) -> u64 {
        self.signature
    }
}