// Copyright 2020 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/ast/function.h"

#include "src/ast/stage_decoration.h"
#include "src/ast/workgroup_decoration.h"
#include "src/program_builder.h"

TINT_INSTANTIATE_TYPEINFO(tint::ast::Function);

namespace tint {
namespace ast {

Function::Function(ProgramID pid,
                   const Source& src,
                   Symbol sym,
                   VariableList parameters,
                   ast::Type* return_ty,
                   BlockStatement* b,
                   DecorationList decos,
                   DecorationList return_type_decos)
    : Base(pid, src),
      symbol(sym),
      params(std::move(parameters)),
      return_type(return_ty),
      body(b),
      decorations(std::move(decos)),
      return_type_decorations(std::move(return_type_decos)) {
  TINT_ASSERT_PROGRAM_IDS_EQUAL_IF_VALID(AST, symbol, program_id);
  TINT_ASSERT_PROGRAM_IDS_EQUAL_IF_VALID(AST, body, program_id);
  for (auto* param : params) {
    TINT_ASSERT(AST, param && param->is_const);
    TINT_ASSERT_PROGRAM_IDS_EQUAL_IF_VALID(AST, param, program_id);
  }
  TINT_ASSERT(AST, symbol.IsValid());
  TINT_ASSERT(AST, return_type);
  for (auto* deco : decorations) {
    TINT_ASSERT_PROGRAM_IDS_EQUAL_IF_VALID(AST, deco, program_id);
  }
  for (auto* deco : return_type_decorations) {
    TINT_ASSERT_PROGRAM_IDS_EQUAL_IF_VALID(AST, deco, program_id);
  }
}

Function::Function(Function&&) = default;

Function::~Function() = default;

PipelineStage Function::PipelineStage() const {
  if (auto* stage = GetDecoration<StageDecoration>(decorations)) {
    return stage->stage;
  }
  return PipelineStage::kNone;
}

Function* Function::Clone(CloneContext* ctx) const {
  // Clone arguments outside of create() call to have deterministic ordering
  auto src = ctx->Clone(source);
  auto sym = ctx->Clone(symbol);
  auto p = ctx->Clone(params);
  auto* ret = ctx->Clone(return_type);
  auto* b = ctx->Clone(body);
  auto decos = ctx->Clone(decorations);
  auto ret_decos = ctx->Clone(return_type_decorations);
  return ctx->dst->create<Function>(src, sym, p, ret, b, decos, ret_decos);
}

Function* FunctionList::Find(Symbol sym) const {
  for (auto* func : *this) {
    if (func->symbol == sym) {
      return func;
    }
  }
  return nullptr;
}

Function* FunctionList::Find(Symbol sym, PipelineStage stage) const {
  for (auto* func : *this) {
    if (func->symbol == sym && func->PipelineStage() == stage) {
      return func;
    }
  }
  return nullptr;
}

bool FunctionList::HasStage(ast::PipelineStage stage) const {
  for (auto* func : *this) {
    if (func->PipelineStage() == stage) {
      return true;
    }
  }
  return false;
}

}  // namespace ast
}  // namespace tint