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use foreign_types::{ForeignTypeRef, Opaque};
use std::ptr;

use crate::dwfl::{Error, ThreadRef};

/// A reference to a stack frame.
pub struct FrameRef(Opaque);

impl ForeignTypeRef for FrameRef {
    type CType = dw_sys::Dwfl_Frame;
}

impl FrameRef {
    /// Returns a reference to the thread corresponding to this frame.
    pub fn thread(&self) -> &ThreadRef {
        unsafe {
            let ptr = dw_sys::dwfl_frame_thread(self.as_ptr());
            ThreadRef::from_ptr(ptr)
        }
    }

    /// Returns the address of the instruction pointer at this frame.
    ///
    /// If provided, `is_activation` parameter will be set to true if this frame is an "activation" (i.e. signal) frame,
    /// and false otherwise.
    pub fn pc(&self, is_activation: Option<&mut bool>) -> Result<u64, Error> {
        unsafe {
            let mut pc = 0;
            let isactivation = is_activation.map_or(ptr::null_mut(), |b| b as *mut bool);
            if dw_sys::dwfl_frame_pc(self.as_ptr(), &mut pc, isactivation) {
                Ok(pc)
            } else {
                Err(Error::new())
            }
        }
    }
}