// Copyright (c) 2023 PaddlePaddle Authors. All Rights Reserved.
//
// 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 <glog/logging.h>
#include <gtest/gtest.h>
#include <sstream>

#include "paddle/cinn/adt/generate_map_expr.h"
#include "paddle/cinn/adt/map_expr_ctx.h"
#include "paddle/cinn/adt/print.h"
#include "paddle/cinn/hlir/dialect/operator/ir/cinn_op.h"
#include "paddle/cinn/hlir/dialect/operator/ir/manual_op.h"
#include "paddle/cinn/hlir/dialect/operator/ir/op_dialect.h"
#include "paddle/cinn/runtime/flags.h"
#include "paddle/fluid/pir/dialect/operator/ir/op_dialect.h"
#include "paddle/fluid/pir/dialect/operator/ir/pd_op.h"
#include "paddle/pir/include/core/ir_context.h"
#include "paddle/pir/include/core/program.h"
#include "paddle/pir/include/dialect/shape/ir/shape_dialect.h"
#include "paddle/pir/include/dialect/shape/ir/shape_op.h"
#include "paddle/pir/include/dialect/shape/transforms/shape_optimization_pass.h"
#include "paddle/pir/include/pass/pass_manager.h"
#include "test/cpp/pir/tools/test_pir_utils.h"

PD_DECLARE_bool(cinn_enable_map_expr);
PD_DECLARE_bool(cinn_enable_map_expr_dynamic_shape);
PD_DECLARE_bool(cinn_enable_map_expr_index_detail);

namespace {
std::string Trim(const std::string& doc) {
  std::stringstream oss{doc};
  std::stringstream ret{};
  std::string str;
  while (oss >> str) {
    std::size_t size = str.size();
    for (; size > 0 && str[size - 1] == ' '; --size) {
    }
    ret << str.substr(0, size) << std::endl;
  }
  return ret.str();
}
}  // namespace

TEST(MapExpr, ElementWise_Fusion_0) {
  cinn::adt::UniqueId::ResetSeqNumber(0);
  ::pir::IrContext* ctx = ::pir::IrContext::Instance();
  ::pir::Program program(ctx);
  ctx->GetOrRegisterDialect<pir::shape::ShapeDialect>();
  ctx->GetOrRegisterDialect<paddle::dialect::OperatorDialect>();
  ctx->GetOrRegisterDialect<cinn::dialect::OperatorDialect>();

  phi::DDim dims_D_2 = {-1, 1};
  pir::Value value1 =
      test::CreateDenseTensorOp(ctx, dims_D_2, {"op1_attr"}, {"op1_name"})
          ->result(0);
  pir::Value value2 =
      test::CreateDenseTensorOp(ctx, dims_D_2, {"op2_attr"}, {"op2_name"})
          ->result(0);
  ::pir::Builder builder = ::pir::Builder(ctx, program.block());
  builder.Build<paddle::dialect::SubtractOp>(
      value1, builder.Build<paddle::dialect::ExpOp>(value2).result(0));

  ::pir::PassManager pass_manager(ctx);

  // TODO(@jiahy0825): use CreateShapeOptimizationPass() instead of
  // CreateInferSymbolicShapePass() which is a fake pass

  /*
  pass_manager.AddPass(::pir::CreateInferSymbolicShapePass(shape_analysis));
  pass_manager.Run(&program);

  std::vector<pir::Operation*> vec_op;
  for (auto& op : *program.block()) {
    vec_op.push_back(&op);
  }
  auto res = cinn::dialect::ir::OpFusionPassInternal(vec_op);
  ASSERT_EQ(res.size(), 1u);
  ASSERT_EQ(res[0]->ops.size(), program.block()->size());
  auto group_list = cinn::dialect::ir::GeneralFusionMergePassInternal(res);
  ASSERT_EQ(group_list.size(), 1u);

  FLAGS_cinn_enable_map_expr = true;
  FLAGS_cinn_enable_map_expr_dynamic_shape = true;
  FLAGS_cinn_enable_map_expr_index_detail = true;

  auto group = group_list.at(0);
  group->shape_analysis = shape_analysis;
  cinn::adt::TryGenerateMapExprFromGroup(group);
  std::string map_expr_str =
      cinn::adt::ToTxtString(group->map_expr_ctx().map_expr(), "MapExprTest");
  std::string target_str = R"TEST(
MapExprTest(t_var_2, t_var_1) {
  AnchoredMapStmt(t_var_0) {
    MapStmt([i_59, i_60]) {
      exp(
          &t_var[IndexDot([BI(i_59, sym_17), 0], [sym_17, 1])],
          t_var_1[IndexDot([BI(i_59, sym_17), 0], [sym_17, 1])]);
      subtract(
          &t_var_0[IndexDot([i_59, i_60], [sym_17, 1])],
          t_var_2[IndexDot([BI(i_59, sym_17), 0], [sym_17, 1])],
          t_var[IndexDot([BI(i_59, sym_17), 0], [sym_17, 1])]);
    }
  }
}
)TEST";
  ASSERT_EQ(Trim(map_expr_str), Trim(target_str));
  */
}