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use crate::{
    handle_id_error, join_sequence, GetLengthRatio, ListOp, NormalForm, Normalize, Op, Term,
    TermVector,
};
use num_rational::Rational64;
use scop::Defs;
use weresocool_error::Error;

impl ListOp {
    pub fn term_vectors(&self, defs: &mut Defs<Term>) -> Result<Vec<TermVector>, Error> {
        match self {
            ListOp::Const { terms } => Ok(terms
                .iter()
                .map(|term| TermVector {
                    term: term.to_owned(),
                    index_terms: vec![],
                })
                .collect()),
            ListOp::Named { name } => {
                let term = handle_id_error(name.to_string(), defs)?;
                match term {
                    Term::Lop(lop) => lop.term_vectors(defs),
                    _ => Err(Error::with_msg("List.term_vectors() called on non-list")),
                }
            }
            ListOp::ListOpIndexed {
                list_op, indices, ..
            } => {
                let term_vectors = list_op.term_vectors(defs)?;
                let index_vectors = indices.vectorize(term_vectors.len())?;

                Ok(index_vectors
                    .iter()
                    .map(|index_vector| {
                        let mut new_index = term_vectors[index_vector.index].clone();
                        index_vector.index_terms.iter().for_each(|index_term| {
                            new_index.index_terms.push(index_term.clone());
                        });
                        new_index
                    })
                    .collect())
            }
            ListOp::Concat { listops } => {
                let mut result = vec![];
                for list in listops {
                    result.extend(list.term_vectors(defs)?)
                }

                Ok(result)
            }
            ListOp::GenOp { gen } => {
                let result = gen
                    .to_owned()
                    .term_vectors_from_genop(None, defs)?
                    .iter()
                    .map(|term| TermVector {
                        term: Term::Op(term.to_owned()),
                        index_terms: vec![],
                    })
                    .collect();
                Ok(result)
            }
        }
    }
}

impl GetLengthRatio<Term> for ListOp {
    fn get_length_ratio(
        &self,
        normal_form: &NormalForm,
        defs: &mut Defs<Term>,
    ) -> Result<Rational64, Error> {
        match self {
            ListOp::Const { terms } => terms
                .iter()
                .try_fold(Rational64::from_integer(0), |acc, term| {
                    Ok(acc + term.get_length_ratio(normal_form, defs)?)
                }),
            ListOp::Named { name } => {
                let term = handle_id_error(name, defs)?;
                match term {
                    Term::Lop(lop) => lop.get_length_ratio(normal_form, defs),
                    _ => Err(Error::with_msg(
                        "List.get_length_ratio() called on non-list",
                    )),
                }
            }
            ListOp::ListOpIndexed { .. } => {
                let mut nf = NormalForm::init();
                self.apply_to_normal_form(&mut nf, defs)?;
                nf.get_length_ratio(normal_form, defs)
            }
            ListOp::Concat { listops } => listops
                .iter()
                .try_fold(Rational64::from_integer(0), |acc, term| {
                    Ok(acc + term.get_length_ratio(normal_form, defs)?)
                }),
            ListOp::GenOp { gen } => gen.get_length_ratio(normal_form, defs),
        }
    }
}

impl ListOp {
    pub fn to_list_nf(
        &self,
        input: &mut NormalForm,
        defs: &mut Defs<Term>,
    ) -> Result<Vec<NormalForm>, Error> {
        match self {
            ListOp::Const { terms } => terms
                .iter()
                .map(|op| {
                    let mut input_clone = input.clone();
                    op.apply_to_normal_form(&mut input_clone, defs)?;
                    Ok(input_clone)
                })
                .collect::<Result<Vec<NormalForm>, Error>>(),

            ListOp::Named { name } => {
                let term = handle_id_error(name, defs)?;
                match term {
                    Term::Lop(lop) => lop.to_list_nf(input, defs),

                    _ => {
                        println!("Using non-list as list.");
                        Err(Error::with_msg("Using non-list as list."))
                    }
                }
            }
            ListOp::ListOpIndexed { .. } => self
                .term_vectors(defs)?
                .iter_mut()
                .map(|term_vector| {
                    let mut nf = input.clone();
                    term_vector.term.apply_to_normal_form(&mut nf, defs)?;
                    term_vector
                        .index_terms
                        .iter()
                        .map(|index_term| {
                            index_term.apply_to_normal_form(&mut nf, defs)?;
                            Ok(())
                        })
                        .collect::<Result<Vec<_>, Error>>()?;
                    Ok(nf)
                })
                .collect::<Result<Vec<NormalForm>, Error>>(),
            ListOp::Concat { listops } => listops
                .iter()
                .map(|list| {
                    let mut nf = input.clone();
                    list.apply_to_normal_form(&mut nf, defs)?;
                    Ok(nf)
                })
                .collect(),
            ListOp::GenOp { gen } => gen.to_owned().generate_from_genop(input, None, defs),
        }
    }
}

impl Normalize<Term> for ListOp {
    fn apply_to_normal_form(
        &self,
        input: &mut NormalForm,
        defs: &mut Defs<Term>,
    ) -> Result<(), Error> {
        match self {
            ListOp::ListOpIndexed { direction, .. } => match direction {
                crate::Direction::Overlay => {
                    Op::Overlay {
                        operations: self
                            .to_list_nf(input, defs)?
                            .iter()
                            .map(|nf| Term::Nf(nf.to_owned()))
                            .collect(),
                    }
                    .apply_to_normal_form(input, defs)?;
                }
                _ => {
                    *input = join_list_nf(self.to_list_nf(input, defs)?);
                }
            },
            _ => *input = join_list_nf(self.to_list_nf(input, defs)?),
        }
        Ok(())
    }
}

pub fn join_list_nf(indexed: Vec<NormalForm>) -> NormalForm {
    indexed.iter().fold(NormalForm::init_empty(), |acc, nf| {
        join_sequence(acc, nf.to_owned())
    })
}