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use std::borrow::Borrow;
use std::fmt::Debug;
use std::sync::Arc;

use anyhow::Result;
use std::marker::PhantomData;

use crate::algorithms::compose::compose_filters::{ComposeFilter, ComposeFilterBuilder};
use crate::algorithms::compose::filter_states::{FilterState, TrivialFilterState};
use crate::algorithms::compose::matchers::{MatchType, Matcher};
use crate::fst_properties::FstProperties;
use crate::fst_traits::Fst;
use crate::semirings::Semiring;
use crate::{StateId, Tr};

#[derive(Debug, Clone)]
pub struct TrivialComposeFilter<W, F1, F2, B1, B2, M1, M2>
where
    W: Semiring,
    F1: Fst<W>,
    F2: Fst<W>,
    B1: Borrow<F1> + Debug,
    B2: Borrow<F2> + Debug,
    M1: Matcher<W, F1, B1>,
    M2: Matcher<W, F2, B2>,
{
    matcher1: Arc<M1>,
    matcher2: Arc<M2>,
    ghost: PhantomData<(W, F1, F2, B1, B2)>,
}

#[derive(Debug)]
pub struct TrivialComposeFilterBuilder<W, F1, F2, B1, B2, M1, M2>
where
    W: Semiring,
    F1: Fst<W>,
    F2: Fst<W>,
    B1: Borrow<F1> + Debug,
    B2: Borrow<F2> + Debug,
    M1: Matcher<W, F1, B1>,
    M2: Matcher<W, F2, B2>,
{
    matcher1: Arc<M1>,
    matcher2: Arc<M2>,
    ghost: PhantomData<(W, F1, F2, B1, B2)>,
}

impl<W, F1, F2, B1, B2, M1, M2> Clone for TrivialComposeFilterBuilder<W, F1, F2, B1, B2, M1, M2>
where
    W: Semiring,
    F1: Fst<W>,
    F2: Fst<W>,
    B1: Borrow<F1> + Debug,
    B2: Borrow<F2> + Debug,
    M1: Matcher<W, F1, B1>,
    M2: Matcher<W, F2, B2>,
{
    fn clone(&self) -> Self {
        TrivialComposeFilterBuilder {
            matcher1: self.matcher1.clone(),
            matcher2: self.matcher2.clone(),
            ghost: PhantomData,
        }
    }
}

impl<W, F1, F2, B1, B2, M1, M2> ComposeFilterBuilder<W, F1, F2, B1, B2, M1, M2>
    for TrivialComposeFilterBuilder<W, F1, F2, B1, B2, M1, M2>
where
    W: Semiring,
    F1: Fst<W>,
    F2: Fst<W>,
    B1: Borrow<F1> + Debug,
    B2: Borrow<F2> + Debug,
    M1: Matcher<W, F1, B1>,
    M2: Matcher<W, F2, B2>,
{
    type IM1 = M1;
    type IM2 = M2;
    type CF = TrivialComposeFilter<W, F1, F2, B1, B2, M1, M2>;

    fn new(fst1: B1, fst2: B2, matcher1: Option<M1>, matcher2: Option<M2>) -> Result<Self> {
        let matcher1 = matcher1.unwrap_or_else(|| M1::new(fst1, MatchType::MatchOutput).unwrap());
        let matcher2 = matcher2.unwrap_or_else(|| M2::new(fst2, MatchType::MatchInput).unwrap());
        Ok(Self {
            matcher1: Arc::new(matcher1),
            matcher2: Arc::new(matcher2),
            ghost: PhantomData,
        })
    }

    fn build(&self) -> Result<Self::CF> {
        Ok(TrivialComposeFilter::<W, F1, F2, B1, B2, M1, M2> {
            matcher1: Arc::clone(&self.matcher1),
            matcher2: Arc::clone(&self.matcher2),
            ghost: PhantomData,
        })
    }
}

impl<W, F1, F2, B1, B2, M1, M2> ComposeFilter<W, F1, F2, B1, B2, M1, M2>
    for TrivialComposeFilter<W, F1, F2, B1, B2, M1, M2>
where
    W: Semiring,
    F1: Fst<W>,
    F2: Fst<W>,
    B1: Borrow<F1> + Debug,
    B2: Borrow<F2> + Debug,
    M1: Matcher<W, F1, B1>,
    M2: Matcher<W, F2, B2>,
{
    type FS = TrivialFilterState;

    fn start(&self) -> Self::FS {
        Self::FS::new(true)
    }

    fn set_state(&mut self, _s1: StateId, _s2: StateId, _filter_state: &Self::FS) -> Result<()> {
        Ok(())
    }

    fn filter_tr(&mut self, _tr1: &mut Tr<W>, _tr2: &mut Tr<W>) -> Result<Self::FS> {
        Ok(Self::FS::new(true))
    }

    fn filter_final(&self, _w1: &mut W, _w2: &mut W) -> Result<()> {
        Ok(())
    }

    fn matcher1(&self) -> &M1 {
        &self.matcher1
    }

    fn matcher2(&self) -> &M2 {
        &self.matcher2
    }

    fn matcher1_shared(&self) -> &Arc<M1> {
        &self.matcher1
    }

    fn matcher2_shared(&self) -> &Arc<M2> {
        &self.matcher2
    }

    fn properties(&self, inprops: FstProperties) -> FstProperties {
        inprops
    }
}