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/*
 * Copyright 2018 Fluence Labs Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

use super::PassingStyle;
use super::ParsedType;

use quote::quote;
use proc_macro2::TokenStream;

use std::fmt;

impl quote::ToTokens for PassingStyle {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(self.to_token_stream());
    }

    fn to_token_stream(&self) -> TokenStream {
        match self {
            PassingStyle::ByValue => quote! {},
            PassingStyle::ByRef => quote! { & },
            PassingStyle::ByMutRef => quote! { &mut },
        }
    }
}

impl quote::ToTokens for ParsedType {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(self.to_token_stream());
    }

    fn to_token_stream(&self) -> proc_macro2::TokenStream {
        match self {
            ParsedType::I8(passing_style) => quote! { #passing_style i8 },
            ParsedType::I16(passing_style) => quote! { #passing_style i16 },
            ParsedType::I32(passing_style) => quote! { #passing_style i32 },
            ParsedType::I64(passing_style) => quote! { #passing_style i64 },
            ParsedType::U8(passing_style) => quote! { #passing_style u8 },
            ParsedType::U16(passing_style) => quote! { #passing_style u16 },
            ParsedType::U32(passing_style) => quote! { #passing_style u32 },
            ParsedType::U64(passing_style) => quote! { #passing_style u64 },
            ParsedType::F32(passing_style) => quote! { #passing_style f32 },
            ParsedType::F64(passing_style) => quote! { #passing_style f64 },
            ParsedType::Boolean(passing_style) => quote! { #passing_style bool },
            ParsedType::Utf8Str(passing_style) => quote! { #passing_style str },
            ParsedType::Utf8String(passing_style) => quote! { #passing_style String },
            ParsedType::Vector(ty, passing_style) => {
                let quoted_type = ty.to_token_stream();
                quote! { #passing_style Vec<#quoted_type> }
            }
            ParsedType::Record(name, passing_style) => {
                let ty = crate::new_ident!(name);
                quote! { #passing_style #ty }
            }
        }
    }
}

impl fmt::Display for ParsedType {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
        match self {
            ParsedType::Boolean(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("bool")
            }
            ParsedType::I8(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("i8")
            }
            ParsedType::I16(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("i16")
            }
            ParsedType::I32(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("i32")
            }
            ParsedType::I64(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("i64")
            }
            ParsedType::U8(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("u8")
            }
            ParsedType::U16(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("u16")
            }
            ParsedType::U32(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("u32")
            }
            ParsedType::U64(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("u64")
            }
            ParsedType::F32(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("f32")
            }
            ParsedType::F64(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("u64")
            }
            ParsedType::Utf8Str(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("str")
            }
            ParsedType::Utf8String(passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("String")
            }
            ParsedType::Vector(ty, passing_style) => {
                passing_style.fmt(f)?;
                f.write_str("Vec<")?;
                ty.fmt(f)?;
                f.write_str(">")
            }
            ParsedType::Record(record_name, passing_style) => {
                passing_style.fmt(f)?;
                f.write_str(&record_name)
            }
        }?;

        Ok(())
    }
}

impl fmt::Display for PassingStyle {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
        match self {
            PassingStyle::ByValue => Ok(()),
            PassingStyle::ByRef => f.write_str("&"),
            PassingStyle::ByMutRef => f.write_str("&mut"),
        }
    }
}