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// Copyright (C) 2019-2023 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::{Block, Identifier, Input, Node, Output, Tuple, Type};

use leo_span::Span;

use core::fmt;
use serde::{Deserialize, Serialize};

/// A finalize block.
#[derive(Clone, Serialize, Deserialize, PartialEq, Eq, Debug)]
pub struct Finalize {
    /// The finalize identifier.
    pub identifier: Identifier,
    /// The finalize block's input parameters.
    pub input: Vec<Input>,
    /// The finalize blocks's output declaration.
    pub output: Vec<Output>,
    /// The finalize block's output type.
    pub output_type: Type,
    /// The body of the function.
    pub block: Block,
    /// The entire span of the finalize block.
    pub span: Span,
}

impl Finalize {
    /// Create a new finalize block.
    pub fn new(identifier: Identifier, input: Vec<Input>, output: Vec<Output>, block: Block, span: Span) -> Self {
        let output_type = match output.len() {
            0 => Type::Unit,
            1 => output[0].type_(),
            _ => Type::Tuple(Tuple(output.iter().map(|output| output.type_()).collect())),
        };

        Self { identifier, input, output, output_type, block, span }
    }
}

impl fmt::Display for Finalize {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        let parameters = self.input.iter().map(|x| x.to_string()).collect::<Vec<_>>().join(",");
        let returns = match self.output.len() {
            0 => "()".to_string(),
            1 => self.output[0].to_string(),
            _ => format!("({})", self.output.iter().map(|x| x.to_string()).collect::<Vec<_>>().join(",")),
        };
        write!(f, " finalize {}({parameters}) -> {returns} {}", self.identifier, self.block)
    }
}

crate::simple_node_impl!(Finalize);