// 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 <sstream>
#include <utility>

#include "src/ast/module.h"
#include "src/clone_context.h"
#include "src/demangler.h"
#include "src/program_builder.h"
#include "src/semantic/expression.h"
#include "src/type_determiner.h"

namespace tint {

Program::Program() = default;

Program::Program(Program&& program)
    : 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_)),
      is_valid_(program.is_valid_) {
  program.AssertNotMoved();
  program.moved_ = true;
}

Program::Program(ProgramBuilder&& builder) {
  is_valid_ = builder.IsValid();
  if (builder.ResolveOnBuild() && builder.IsValid()) {
    TypeDeterminer td(&builder);
    if (!td.Determine()) {
      diagnostics_.add_error(td.error());
      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_ = ast_nodes_.Create<ast::Module>(
      Source{}, builder.AST().ConstructedTypes(), builder.AST().Functions(),
      builder.AST().GlobalVariables());
  sem_ = std::move(builder.Sem());
  symbols_ = std::move(builder.Symbols());
  diagnostics_.add(std::move(builder.Diagnostics()));
  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("invalid program generated");
  }
}

Program::~Program() = default;

Program& Program::operator=(Program&& program) {
  program.AssertNotMoved();
  program.moved_ = true;
  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_);
  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_;
}

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

std::string Program::to_str(bool demangle) const {
  AssertNotMoved();
  auto str = ast_->to_str(Sem());
  if (demangle) {
    str = Demangler().Demangle(Symbols(), str);
  }
  return str;
}

std::string Program::str(const ast::Node* node) const {
  return Demangler().Demangle(Symbols(), node->str(Sem()));
}

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

}  // namespace tint