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use super::PassManager;
use crate::{pass::Pass, string_ref::StringRef};
use mlir_sys::{
    mlirOpPassManagerAddOwnedPass, mlirOpPassManagerGetNestedUnder, mlirPrintPassPipeline,
    MlirOpPassManager, MlirStringRef,
};
use std::{
    ffi::c_void,
    fmt::{self, Display, Formatter},
    marker::PhantomData,
};

/// An operation pass manager.
#[derive(Clone, Copy, Debug)]
pub struct OperationPassManager<'c, 'a> {
    raw: MlirOpPassManager,
    _parent: PhantomData<&'a PassManager<'c>>,
}

impl<'c, 'a> OperationPassManager<'c, 'a> {
    /// Returns an operation pass manager for nested operations corresponding to
    /// a given name.
    pub fn nested_under(&self, name: &str) -> Self {
        let name = StringRef::new(name);

        unsafe { Self::from_raw(mlirOpPassManagerGetNestedUnder(self.raw, name.to_raw())) }
    }

    /// Adds a pass.
    pub fn add_pass(&self, pass: Pass) {
        unsafe { mlirOpPassManagerAddOwnedPass(self.raw, pass.to_raw()) }
    }

    /// Converts an operation pass manager into a raw object.
    pub const fn to_raw(self) -> MlirOpPassManager {
        self.raw
    }

    /// Creates an operation pass manager from a raw object.
    ///
    /// # Safety
    ///
    /// A raw object must be valid.
    pub unsafe fn from_raw(raw: MlirOpPassManager) -> Self {
        Self {
            raw,
            _parent: Default::default(),
        }
    }
}

impl<'c, 'a> Display for OperationPassManager<'c, 'a> {
    fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
        let mut data = (formatter, Ok(()));

        unsafe extern "C" fn callback(string: MlirStringRef, data: *mut c_void) {
            let data = &mut *(data as *mut (&mut Formatter, fmt::Result));
            let result = (|| -> fmt::Result {
                write!(
                    data.0,
                    "{}",
                    StringRef::from_raw(string)
                        .as_str()
                        .map_err(|_| fmt::Error)?
                )
            })();

            if data.1.is_ok() {
                data.1 = result;
            }
        }

        unsafe {
            mlirPrintPassPipeline(self.raw, Some(callback), &mut data as *mut _ as *mut c_void);
        }

        data.1
    }
}