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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 leo_ast::*;

use crate::Unroller;

impl ProgramReconstructor for Unroller<'_> {
    fn reconstruct_stub(&mut self, input: Stub) -> Stub {
        // Set the current program
        self.current_program = Some(input.stub_id.name.name);
        Stub {
            imports: input.imports,
            stub_id: input.stub_id,
            consts: input.consts,
            structs: input.structs,
            mappings: input.mappings,
            span: input.span,
            functions: input.functions.into_iter().map(|(i, f)| (i, self.reconstruct_function_stub(f))).collect(),
        }
    }

    fn reconstruct_program_scope(&mut self, input: ProgramScope) -> ProgramScope {
        // Don't need to reconstructed consts, just need to add them to constant propagation table
        input.consts.into_iter().for_each(|(_, c)| {
            self.reconstruct_const(c);
        });
        // Set the current program
        self.current_program = Some(input.program_id.name.name);
        // Reconstruct the program scope
        ProgramScope {
            program_id: input.program_id,
            structs: input.structs,
            mappings: input.mappings,
            functions: input.functions.into_iter().map(|(i, f)| (i, self.reconstruct_function(f))).collect(),
            consts: Vec::new(),
            span: input.span,
        }
    }

    // Don't need to reconstruct anything, just need to add child scopes for constant propagation table
    fn reconstruct_function_stub(&mut self, input: FunctionStub) -> FunctionStub {
        // Lookup function metadata in the symbol table.
        // Note that this unwrap is safe since function metadata is stored in a prior pass.
        let function_index = self
            .symbol_table
            .borrow()
            .lookup_fn_symbol(Location::new(self.current_program, input.identifier.name))
            .unwrap()
            .id;

        // Enter the function's scope.
        let previous_function_index = self.enter_scope(function_index);

        // Exit the function's scope.
        self.exit_scope(previous_function_index);

        input
    }

    fn reconstruct_function(&mut self, function: Function) -> Function {
        // Lookup function metadata in the symbol table.
        // Note that this unwrap is safe since function metadata is stored in a prior pass.
        let function_index = self
            .symbol_table
            .borrow()
            .lookup_fn_symbol(Location::new(self.current_program, function.identifier.name))
            .unwrap()
            .id;

        // Enter the function's scope.
        let previous_function_index = self.enter_scope(function_index);

        let previous_scope_index = self.enter_scope(self.scope_index);

        let block = self.reconstruct_block(function.block).0;

        self.exit_scope(previous_scope_index);

        // Reconstruct the function block.
        let reconstructed_function = 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,
        };

        // Exit the function's scope.
        self.exit_scope(previous_function_index);

        reconstructed_function
    }
}