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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The Leo library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.

use crate::{AsgConvertError, BlockStatement, Expression, FromAst, Node, PartialType, Scope, Span, Statement, Type};

use std::sync::{Arc, Weak};

pub struct ConditionalStatement {
    pub parent: Option<Weak<Statement>>,
    pub span: Option<Span>,
    pub condition: Arc<Expression>,
    pub result: Arc<Statement>,
    pub next: Option<Arc<Statement>>,
}

impl Node for ConditionalStatement {
    fn span(&self) -> Option<&Span> {
        self.span.as_ref()
    }
}

impl FromAst<leo_ast::ConditionalStatement> for ConditionalStatement {
    fn from_ast(
        scope: &Scope,
        statement: &leo_ast::ConditionalStatement,
        _expected_type: Option<PartialType>,
    ) -> Result<Self, AsgConvertError> {
        let condition = Arc::<Expression>::from_ast(scope, &statement.condition, Some(Type::Boolean.into()))?;
        let result = Arc::new(Statement::Block(BlockStatement::from_ast(
            scope,
            &statement.block,
            None,
        )?));
        let next = statement
            .next
            .as_deref()
            .map(|next| -> Result<Arc<Statement>, AsgConvertError> { Arc::<Statement>::from_ast(scope, next, None) })
            .transpose()?;

        Ok(ConditionalStatement {
            parent: None,
            span: Some(statement.span.clone()),
            condition,
            result,
            next,
        })
    }
}

impl Into<leo_ast::ConditionalStatement> for &ConditionalStatement {
    fn into(self) -> leo_ast::ConditionalStatement {
        leo_ast::ConditionalStatement {
            condition: self.condition.as_ref().into(),
            block: match self.result.as_ref() {
                Statement::Block(block) => block.into(),
                _ => unimplemented!(),
            },
            next: self.next.as_deref().map(|e| Box::new(e.into())),
            span: self.span.clone().unwrap_or_default(),
        }
    }
}