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// Copyright (C) 2019-2024 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::StaticSingleAssigner;

use leo_ast::{
    Block,
    Composite,
    Function,
    FunctionConsumer,
    Member,
    Program,
    ProgramConsumer,
    ProgramScope,
    ProgramScopeConsumer,
    StatementConsumer,
    StructConsumer,
};
use leo_span::{Symbol, sym};

use indexmap::IndexMap;

impl StructConsumer for StaticSingleAssigner<'_> {
    type Output = Composite;

    /// Reconstructs records in the program, ordering its fields such that `owner` and is the first field.
    fn consume_struct(&mut self, struct_: Composite) -> Self::Output {
        match struct_.is_record {
            false => struct_,
            true => {
                let mut members = Vec::with_capacity(struct_.members.len());
                let mut member_map: IndexMap<Symbol, Member> =
                    struct_.members.into_iter().map(|member| (member.identifier.name, member)).collect();

                // Add the owner field to the beginning of the members list.
                // Note that type checking ensures that the owner field exists.
                members.push(member_map.shift_remove(&sym::owner).unwrap());

                // Add the remaining fields to the members list.
                members.extend(member_map.into_iter().map(|(_, member)| member));

                Composite { members, ..struct_ }
            }
        }
    }
}

impl FunctionConsumer for StaticSingleAssigner<'_> {
    type Output = Function;

    /// Reconstructs the `Function`s in the `Program`, while allocating the appropriate `RenameTable`s.
    fn consume_function(&mut self, function: Function) -> Self::Output {
        // Allocate a `RenameTable` for the function.
        self.push();

        // There is no need to reconstruct `function.inputs`.
        // However, for each input, we must add each symbol to the rename table.
        for input_variable in function.input.iter() {
            let identifier = input_variable.identifier();
            self.rename_table.update(identifier.name, identifier.name, identifier.id);
        }

        let block =
            Block { span: function.block.span, id: function.block.id, statements: self.consume_block(function.block) };

        // Remove the `RenameTable` for the function.
        self.pop();

        Function {
            annotations: function.annotations,
            variant: function.variant,
            identifier: function.identifier,
            input: function.input,
            output: function.output,
            output_type: function.output_type,
            block,
            span: function.span,
            id: function.id,
        }
    }
}

impl ProgramScopeConsumer for StaticSingleAssigner<'_> {
    type Output = ProgramScope;

    fn consume_program_scope(&mut self, input: ProgramScope) -> Self::Output {
        self.program = Some(input.program_id.name.name);
        ProgramScope {
            program_id: input.program_id,
            structs: input.structs.into_iter().map(|(i, s)| (i, self.consume_struct(s))).collect(),
            mappings: input.mappings,
            functions: input.functions.into_iter().map(|(i, f)| (i, self.consume_function(f))).collect(),
            consts: input.consts,
            span: input.span,
        }
    }
}

impl ProgramConsumer for StaticSingleAssigner<'_> {
    type Output = Program;

    fn consume_program(&mut self, input: Program) -> Self::Output {
        Program {
            imports: input
                .imports
                .into_iter()
                .map(|(name, (import, span))| (name, (self.consume_program(import), span)))
                .collect(),
            stubs: input.stubs,
            program_scopes: input
                .program_scopes
                .into_iter()
                .map(|(name, scope)| (name, self.consume_program_scope(scope)))
                .collect(),
        }
    }
}