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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::{Expression, Node, Span};

pub use leo_grammar::operations::AssignOperation as GrammarAssignOperation;
use leo_grammar::statements::AssignStatement as GrammarAssignStatement;
use serde::{Deserialize, Serialize};
use std::fmt;

mod assignee;
pub use assignee::*;

#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug)]
pub enum AssignOperation {
    Assign,
    Add,
    Sub,
    Mul,
    Div,
    Pow,
}

impl AsRef<str> for AssignOperation {
    fn as_ref(&self) -> &'static str {
        match self {
            AssignOperation::Assign => "=",
            AssignOperation::Add => "+=",
            AssignOperation::Sub => "-=",
            AssignOperation::Mul => "*=",
            AssignOperation::Div => "/=",
            AssignOperation::Pow => "**=",
        }
    }
}

#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug)]
pub struct AssignStatement {
    pub operation: AssignOperation,
    pub assignee: Assignee,
    pub value: Expression,
    pub span: Span,
}

impl fmt::Display for AssignStatement {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{} {} {};", self.assignee, self.operation.as_ref(), self.value)
    }
}

impl<'ast> From<GrammarAssignStatement<'ast>> for AssignStatement {
    fn from(statement: GrammarAssignStatement<'ast>) -> Self {
        AssignStatement {
            operation: match statement.assign {
                GrammarAssignOperation::Assign(_) => AssignOperation::Assign,
                GrammarAssignOperation::AddAssign(_) => AssignOperation::Add,
                GrammarAssignOperation::SubAssign(_) => AssignOperation::Sub,
                GrammarAssignOperation::MulAssign(_) => AssignOperation::Mul,
                GrammarAssignOperation::DivAssign(_) => AssignOperation::Div,
                GrammarAssignOperation::PowAssign(_) => AssignOperation::Pow,
            },
            assignee: Assignee::from(statement.assignee),
            value: Expression::from(statement.expression),
            span: Span::from(statement.span),
        }
    }
}

impl Node for AssignStatement {
    fn span(&self) -> &Span {
        &self.span
    }

    fn set_span(&mut self, span: Span) {
        self.span = span;
    }
}