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// Copyright Fauna, Inc.
// SPDX-License-Identifier: MIT-0

mod fql;

use wasm_bindgen::prelude::*;

use crate::fql::values;
use crate::values::FQLValue;
use crate::fql::verbs::*;

extern crate pest;

#[macro_use]
extern crate pest_derive;

use pest::Parser;

#[derive(Parser)]
#[grammar = "fql.pest"]
struct FQLParser;

use pest::error::Error;

fn parse_fql_query(query: &str) -> Result<FQLValue, Error<Rule>> {
    let fql = FQLParser::parse(Rule::fql, query)?.next().unwrap();

    use pest::iterators::Pair;

    fn parse_value(pair: Pair<Rule>) -> FQLValue {
        match pair.as_rule() {
            Rule::object => FQLValue::Object(
                pair.into_inner()
                    .map(|pair| {
                        let mut inner_rules = pair.into_inner();
                        let name = inner_rules
                            .next()
                            .unwrap()
                            .into_inner()
                            .next()
                            .unwrap()
                            .as_str();
                        let value = parse_value(inner_rules.next().unwrap());
                        (name, value)
                    })
                    .collect(),
            ),
            Rule::array => FQLValue::Array(pair.into_inner().map(parse_value).collect()),
            Rule::string => FQLValue::String(pair.into_inner().next().unwrap().as_str()),
            Rule::number => FQLValue::Number(pair.as_str().parse().unwrap()),
            Rule::boolean => FQLValue::Boolean(pair.as_str().parse().unwrap()),
            Rule::niladicExpr => FQLValue::NiladicVerb(parse_niladic_verb(pair).unwrap()),
            Rule::monadicExpr => FQLValue::MonadicVerb(parse_monadic_verb(pair).unwrap()),
            Rule::dyadicExpr => FQLValue::DyadicVerb(parse_dyadic_verb(pair).unwrap()),
            Rule::triadicExpr => FQLValue::TriadicVerb(parse_triadic_verb(pair).unwrap()),
            Rule::variadicExpr => FQLValue::VariadicVerb(parse_variadic_verb(pair).unwrap()),
            Rule::null => FQLValue::Null,
            Rule::EOI
            | Rule::fql
            | Rule::pair
            | Rule::value
            | Rule::niladicVerb
            | Rule::monadicVerb
            | Rule::dyadicVerb
            | Rule::triadicVerb
            | Rule::variadicVerb
            | Rule::expr
            | Rule::inner
            | Rule::char
            | Rule::WHITESPACE => unreachable!(),
        }
    }
    
    fn parse_niladic_verb(pair: Pair<Rule>) -> Result<NiladicVerb, Error<Rule>> {
        let mut inner_rules = pair.into_inner();
        let verb = inner_rules.next().unwrap().as_str();
        
        Ok(NiladicVerb{verb})
    }

    fn parse_monadic_verb(pair: Pair<Rule>) -> Result<MonadicVerb, Error<Rule>> {
        let mut inner_rules = pair.into_inner();
        let verb = inner_rules.next().unwrap().as_str();
        let args = inner_rules.map(parse_value).collect();
        
        Ok(
            MonadicVerb{
                verb,
                args,
            }
        )
    }

    fn parse_dyadic_verb(pair: Pair<Rule>) -> Result<DyadicVerb, Error<Rule>> {
        let mut inner_rules = pair.into_inner();
        let verb = inner_rules.next().unwrap().as_str();
        let args = inner_rules.map(parse_value).collect();
        
        Ok(
            DyadicVerb{
                verb,
                args,
            }
        )
    }

    fn parse_triadic_verb(pair: Pair<Rule>) -> Result<TriadicVerb, Error<Rule>> {
        let mut inner_rules = pair.into_inner();
        let verb = inner_rules.next().unwrap().as_str();
        let args = inner_rules.map(parse_value).collect();
        
        Ok(
            TriadicVerb{
                verb,
                args,
            }
        )
    }

    fn parse_variadic_verb(pair: Pair<Rule>) -> Result<VariadicVerb, Error<Rule>> {
        let mut inner_rules = pair.into_inner();
        let verb = inner_rules.next().unwrap().as_str();
        let args = inner_rules.map(parse_value).collect();
        
        Ok(
            VariadicVerb{
                verb, 
                args,
            }
        )
    }

    Ok(parse_value(fql))
}

#[wasm_bindgen]
pub fn serialize_fql_query(query: &str) -> String {
    let parsed = parse_fql_query(query).unwrap();
    values::serialize_fqlvalue(&parsed)
}