// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/program.h"

#include <utility>

#include "src/demangler.h"
#include "src/resolver/resolver.h"
#include "src/sem/expression.h"

namespace tint {
namespace {

std::string DefaultPrinter(const Program*) {
  return "<no program printer assigned>";
}

}  // namespace

Program::Printer Program::printer = DefaultPrinter;

Program::Program() = default;

Program::Program(Program&& program)
    : id_(std::move(program.id_)),
      types_(std::move(program.types_)),
      ast_nodes_(std::move(program.ast_nodes_)),
      sem_nodes_(std::move(program.sem_nodes_)),
      ast_(std::move(program.ast_)),
      sem_(std::move(program.sem_)),
      symbols_(std::move(program.symbols_)),
      diagnostics_(std::move(program.diagnostics_)),
      transforms_applied_(std::move(program.transforms_applied_)),
      is_valid_(program.is_valid_) {
  program.AssertNotMoved();
  program.moved_ = true;
}

Program::Program(ProgramBuilder&& builder) {
  id_ = builder.ID();

  is_valid_ = builder.IsValid();
  if (builder.ResolveOnBuild() && builder.IsValid()) {
    resolver::Resolver resolver(&builder);
    if (!resolver.Resolve()) {
      is_valid_ = false;
    }
  }

  // The above must be called *before* the calls to std::move() below
  types_ = std::move(builder.Types());
  ast_nodes_ = std::move(builder.ASTNodes());
  sem_nodes_ = std::move(builder.SemNodes());
  ast_ = &builder.AST();  // ast::Module is actually a heap allocation.
  sem_ = std::move(builder.Sem());
  symbols_ = std::move(builder.Symbols());
  diagnostics_.add(std::move(builder.Diagnostics()));
  transforms_applied_ = builder.TransformsApplied();
  builder.MarkAsMoved();

  if (!is_valid_ && !diagnostics_.contains_errors()) {
    // If the builder claims to be invalid, then we really should have an error
    // message generated. If we find a situation where the program is not valid
    // and there are no errors reported, add one here.
    diagnostics_.add_error(diag::System::Program, "invalid program generated");
  }
}

Program::~Program() = default;

Program& Program::operator=(Program&& program) {
  program.AssertNotMoved();
  program.moved_ = true;
  moved_ = false;
  id_ = std::move(program.id_);
  types_ = std::move(program.types_);
  ast_nodes_ = std::move(program.ast_nodes_);
  sem_nodes_ = std::move(program.sem_nodes_);
  ast_ = std::move(program.ast_);
  sem_ = std::move(program.sem_);
  symbols_ = std::move(program.symbols_);
  diagnostics_ = std::move(program.diagnostics_);
  transforms_applied_ = std::move(program.transforms_applied_);
  is_valid_ = program.is_valid_;
  return *this;
}

Program Program::Clone() const {
  AssertNotMoved();
  return Program(CloneAsBuilder());
}

ProgramBuilder Program::CloneAsBuilder() const {
  AssertNotMoved();
  ProgramBuilder out;
  CloneContext(&out, this).Clone();
  return out;
}

bool Program::IsValid() const {
  AssertNotMoved();
  return is_valid_;
}

const sem::Type* Program::TypeOf(const ast::Expression* expr) const {
  auto* sem = Sem().Get(expr);
  return sem ? sem->Type() : nullptr;
}

const sem::Type* Program::TypeOf(const ast::Type* type) const {
  return Sem().Get(type);
}

const sem::Type* Program::TypeOf(const ast::TypeDecl* type_decl) const {
  return Sem().Get(type_decl);
}

void Program::AssertNotMoved() const {
  TINT_ASSERT(Program, !moved_);
}

}  // namespace tint