/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef UNITTEST_SQL_OPTIMIZER_OB_STDIN_ITER_H_
#define UNITTEST_SQL_OPTIMIZER_OB_STDIN_ITER_H_

#include "common/object/ob_object.h"
#include "common/row/ob_row_store.h"
#include "lib/hash/ob_hashmap.h"
#include "lib/time/ob_time_utility.h"
#include "lib/string/ob_string.h"
#include <iostream>
#include <fstream>
#include <string>
#include "sql/engine/ob_phy_operator.h"
#include "sql/engine/ob_phy_operator_type.h"
#include "lib/container/ob_se_array.h"
#include "common/object/ob_obj_type.h"
#include "sql/engine/ob_exec_context.h"

namespace oceanbase {

using namespace sql;

namespace common {

class ObMockIterWithLimit : public ObNewRowIterator {
public:
  ObMockIterWithLimit() : need_row_count_(0), got_row_count_(0){};
  virtual ~ObMockIterWithLimit(){};

  void set_need_row_count(int64_t count)
  {
    need_row_count_ = count;
  }

  int64_t get_need_row_count()
  {
    return need_row_count_;
  }

  bool is_iter_end()
  {
    return need_row_count_ == got_row_count_;
  }

protected:
  void advance_iter()
  {
    ++got_row_count_;
  }

  void rescan()
  {
    got_row_count_ = 0;
  }

  int64_t need_row_count_;
  int64_t got_row_count_;
};

#define VARCHAR_ACT_TYPE ObVarcharType
#define TINYINT_ACT_TYPE ObTinyIntType
#define SMALLINT_ACT_TYPE ObSmallIntType
#define MEDIUMINT_ACT_TYPE ObMediumIntType
#define INT_ACT_TYPE ObInt32Type
#define BIGINT_ACT_TYPE ObIntType
#define TINYINT_UNSIGNED_ACT_TYPE ObUTinyIntType
#define SMALLINT_UNSIGNED_ACT_TYPE ObUSmallIntType
#define MEDIUMINT_UNSIGNED_ACT_TYPE ObUMediumIntType
#define INT_UNSIGNED_ACT_TYPE ObUInt32Type
#define BIGINT_UNSIGNED_ACT_TYPE ObUint64Type
#define FLOAT_ACT_TYPE ObFloatType
#define DOUBLE_ACT_TYPE ObDoubleType
#define TS_ACT_TYPE ObTimestampType
#define NULLT_ACT_TYPE ObNullType
#define NUMBER_ACT_TYPE ObNumberType

#define AT_(type) type##_ACT_TYPE

#define RANDOM_CELL_GEN_CLASS_NAME(type) Random##type##CellGen

#define DECLARE_RANDOM_CELL_GEN(type)                             \
  class RANDOM_CELL_GEN_CLASS_NAME(type) : public RandomCellGen { \
  public:                                                         \
    RANDOM_CELL_GEN_CLASS_NAME(type)()                            \
    {                                                             \
      type_ = AT_(type);                                          \
    };                                                            \
    virtual ObObj gen(ObIAllocator& buf, int64_t seed);           \
  }

#define RANDOM_CELL_GEN_CTR_NAME(type) get_##type##_gen
#define DECLARE_RANDOM_CELL_GEN_CTR(type)                                  \
  static RandomCellGen* RANDOM_CELL_GEN_CTR_NAME(type)(ObIAllocator & buf) \
  {                                                                        \
    void* gen_buf = buf.alloc(sizeof(RANDOM_CELL_GEN_CLASS_NAME(type)));   \
    if (NULL == gen_buf)                                                   \
      return NULL;                                                         \
    else                                                                   \
      return new (gen_buf) RANDOM_CELL_GEN_CLASS_NAME(type)();             \
  }

class ObStdinIter : public ObMockIterWithLimit {
public:
  enum EOFBehavior { TERMINATE, REWIND, RANDOM };

private:
  EOFBehavior on_eof_;
  int64_t get_count_;
  bool pure_random_;

  class IRandomCellGen {
  public:
    virtual ObObj gen(ObIAllocator& buf, int64_t seed) = 0;
    void set_max(ObObj max)
    {
      max_ = max;
    }
    void set_min(ObObj min)
    {
      min_ = min;
    }
    ObObj max_;
    ObObj min_;
    TO_STRING_KV(K("IRandomCellGen"));
  };

  class RandomCellGen : public IRandomCellGen {
  public:
    RandomCellGen()
        : type_(ObNullType), acc_(NULL), need_random(false), length(0), common_prefix_len(10), my_buf(NULL){};
    virtual ObObj gen(ObIAllocator& buf, int64_t seed) = 0;
    ObObjType type_;
    const ObAccuracy* acc_;
    bool need_random;
    int64_t length;
    int64_t common_prefix_len;
    char* my_buf;
  };

  typedef RandomCellGen* (*RandomCellGenCtr)(ObIAllocator& buf);

  DECLARE_RANDOM_CELL_GEN(BIGINT);
  DECLARE_RANDOM_CELL_GEN(VARCHAR);
  DECLARE_RANDOM_CELL_GEN(NULLT);
  DECLARE_RANDOM_CELL_GEN(TS);
  DECLARE_RANDOM_CELL_GEN(NUMBER);
  DECLARE_RANDOM_CELL_GEN(DOUBLE);
  DECLARE_RANDOM_CELL_GEN(FLOAT);

  DECLARE_RANDOM_CELL_GEN_CTR(BIGINT);
  DECLARE_RANDOM_CELL_GEN_CTR(VARCHAR);
  DECLARE_RANDOM_CELL_GEN_CTR(NULLT);
  DECLARE_RANDOM_CELL_GEN_CTR(TS);
  DECLARE_RANDOM_CELL_GEN_CTR(NUMBER);
  DECLARE_RANDOM_CELL_GEN_CTR(DOUBLE);
  DECLARE_RANDOM_CELL_GEN_CTR(FLOAT);

  bool map_inited;
  hash::ObHashMap<ObString, ObObjType> str_to_type_map_mysql_;
  RandomCellGenCtr random_cell_gen_ctrs[ObMaxType];
  oceanbase::common::ObSEArray<oceanbase::share::schema::ObColDesc, 10> col_descs;
  oceanbase::common::ObSEArray<IRandomCellGen*, 10> random_cell_generators;

  mutable int64_t time_consumed_;

  ObIAllocator& buf_;

  const static int64_t MAX_COLUMN_COUNT = 512;

  bool need_random[MAX_COLUMN_COUNT];

  const oceanbase::share::schema::ObTableSchema* schema_;
  static const int64_t STR_MAIN_BUF_SIZE = 655360;
  char str_main_buf_[STR_MAIN_BUF_SIZE];
  int64_t str_main_buf_ptr;

public:
  ObStdinIter(ObIAllocator& buf)
      : on_eof_(TERMINATE),
        time_consumed_(0),
        buf_(buf),
        str_main_buf_ptr(0),
        seed(0),
        seed_min(0),
        seed_max(INT64_MAX),
        seed_step(1),
        seed_step_length(1),
        seed_step_current(0)
  {
    memset(need_random, false, sizeof(need_random) / sizeof(need_random[0]));
    memset(random_cell_gen_ctrs, 0, sizeof(random_cell_gen_ctrs) / sizeof(random_cell_gen_ctrs[0]));
    memset(str_main_buf_, 0, sizeof(str_main_buf_));
    random_cell_gen_ctrs[ObIntType] = RANDOM_CELL_GEN_CTR_NAME(BIGINT);
    random_cell_gen_ctrs[ObVarcharType] = RANDOM_CELL_GEN_CTR_NAME(VARCHAR);
    random_cell_gen_ctrs[ObTimestampType] = RANDOM_CELL_GEN_CTR_NAME(TS);
    random_cell_gen_ctrs[ObNumberType] = RANDOM_CELL_GEN_CTR_NAME(NUMBER);
    random_cell_gen_ctrs[ObDoubleType] = RANDOM_CELL_GEN_CTR_NAME(DOUBLE);
    random_cell_gen_ctrs[ObFloatType] = RANDOM_CELL_GEN_CTR_NAME(FLOAT);
    init_type_map();
  }
  virtual ~ObStdinIter()
  {}
  int init_type_map();
  virtual void reset(){};
  virtual int get_next_row(ObNewRow*& row);

  // int init_schema(string &line, ObIAllocator &buf);
  int init_schema(const oceanbase::share::schema::ObTableSchema& schema);

  int extract_column_info(const std::string& line, ObIArray<oceanbase::common::ObObjType>& column_info);
  int lookup_type_from_str(const char* str, int64_t len, ObObjType& type);
  int init_random_cell_gen(const oceanbase::share::schema::ObTableSchema& schema,
      const ObIArray<oceanbase::share::schema::ObColDesc>& column_types, ObIAllocator& buf);
  void set_common_prefix_len(int64_t len);

  static char rand_char();

  void set_pure_random(bool random)
  {
    pure_random_ = random;
  }

  void set_random_column(int64_t i)
  {
    need_random[i] = true;
  }

  void set_eof_behavior(EOFBehavior behavior)
  {
    on_eof_ = behavior;
  }

  void init_projector(int64_t count)
  {
    if (NULL == new_row_.projector_) {
      new_row_.projector_ = static_cast<int32_t*>(buf_.alloc(count * sizeof(int32_t)));
    }
  }

  void add_projector(int64_t i)
  {
    new_row_.projector_[new_row_.projector_size_] = static_cast<int32_t>(i);
    ++new_row_.projector_size_;
  }

  int rescan()
  {
    seed = seed_min;
    seed_step_current = 0;
    ObMockIterWithLimit::rescan();
    return OB_SUCCESS;
  }

  int build_obj_from_str(const char* str, int64_t len, ObObjType type, ObObj& obj, ObIAllocator& buf);
  int fill_new_row_from_line(const std::string& line, ObNewRow& row,
      oceanbase::common::ObIArray<oceanbase::share::schema::ObColDesc>& col_desc, ObIAllocator& allocator);
  int fill_new_row_with_random(ObNewRow& row, ObIAllocator& allocator) const;
  int gen_random_cell_for_column(const int64_t column_id, ObObj& obj, ObIAllocator& buf, int64_t seed) const;
  static int cast_to_type(
      const ObObj& src, ObObj& res, ObObjType type, ObIAllocator& buf, const ObAccuracy* acc = NULL);

  const oceanbase::share::schema::ObTableSchema* get_schema()
  {
    return schema_;
  }

  mutable int64_t seed;

  mutable int64_t seed_min;
  mutable int64_t seed_max;
  mutable int64_t seed_step;
  mutable int64_t seed_step_length;
  mutable int64_t seed_step_current;

  ObNewRow new_row_;
};
static ObArenaAllocator alloc_;
class MyMockOperator : public ObPhyOperator {
public:
  mutable int64_t time_;

  class MyMockCtx : public ObPhyOperatorCtx {

    friend class MyMockOperator;

  public:
    MyMockCtx(ObExecContext& ctx) : ObPhyOperatorCtx(ctx)
    {
      UNUSED(ctx);
    }
    virtual ~MyMockCtx(){};
    virtual void destroy()
    {
      return ObPhyOperatorCtx::destroy_base();
    }
  };

  MyMockOperator() : ObPhyOperator(alloc_)
  {}
  ObStdinIter* iter;

  oceanbase::sql::ObPhyOperatorType get_type() const
  {
    return op_type_;
  }
  void set_type(ObPhyOperatorType op_type)
  {
    op_type_ = op_type;
  }

  virtual int set_child(int32_t child_idx, ObPhyOperator& child_operator)
  {
    UNUSED(child_idx);
    UNUSED(child_operator);
    return OB_SUCCESS;
  };
  virtual ObPhyOperator* get_child(int32_t child_idx) const
  {
    UNUSED(child_idx);
    return NULL;
  }
  virtual int32_t get_child_num() const
  {
    return OB_SUCCESS;
  };
  virtual int inner_open(ObExecContext& ctx) const
  {
    int ret = OB_SUCCESS;

    int64_t open_start = ObTimeUtility::current_time();

    if (OB_FAIL(init_op_ctx(ctx))) {
      SQL_OPT_LOG(WARN, "failed to init op ctx");
    } else {
    }

    int64_t open_end = ObTimeUtility::current_time();

    time_ = open_end - open_start;

    return ret;
  };

  virtual int close(ObExecContext& ctx) const
  {
    UNUSED(ctx);
    return OB_SUCCESS;
  };
  virtual int init_op_ctx(ObExecContext& ctx) const
  {
    int ret = OB_SUCCESS;
    ObPhyOperatorCtx* op_ctx = NULL;
    if (OB_FAIL(inner_create_operator_ctx(ctx, op_ctx))) {
      SQL_OPT_LOG(WARN, "failed to init op ctx");
    } else if (OB_FAIL(op_ctx->create_cur_row(iter->get_schema()->get_column_count(), NULL, 0))) {
      SQL_OPT_LOG(WARN, "failed to create cur row");
    } else {
      op_ctx->get_cur_row().projector_ = projector_;
      op_ctx->get_cur_row().projector_size_ = projector_size_;
    }
    return ret;
  };

  int inner_create_operator_ctx(ObExecContext& ctx, ObPhyOperatorCtx*& op_ctx) const
  {
    int ret = OB_SUCCESS;
    MyMockCtx* mock_ctx = NULL;
    if (OB_FAIL(CREATE_PHY_OPERATOR_CTX(MyMockCtx, ctx, get_id(), get_type(), mock_ctx))) {
      SQL_OPT_LOG(WARN, "failed to init op ctx");
    } else {
      op_ctx = mock_ctx;
    }
    return ret;
  }

  virtual int inner_get_next_row(ObExecContext& ctx, const common::ObNewRow*& row) const
  {
    UNUSED(ctx);
    int ret = OB_SUCCESS;
    if (NULL == iter) {
      ret = OB_NOT_INIT;
    } else {
      MyMockCtx* mock_ctx = NULL;
      int64_t get_start = ObTimeUtility::current_time();
      if (NULL == (mock_ctx = GET_PHY_OPERATOR_CTX(MyMockCtx, ctx, get_id()))) {

      } else {

        common::ObNewRow* cur_row = &mock_ctx->get_cur_row();
        ret = iter->get_next_row(cur_row);

        if (OB_SUCC(ret)) {
          row = cur_row;
        }
      }

      int64_t get_end = ObTimeUtility::current_time();
      time_ += get_end - get_start;
    }
    return ret;
  };
  virtual int init(ObExecContext& ctx, ObTaskInfo& task_info, ObPhyOperator& op)
  {
    UNUSED(ctx);
    UNUSED(task_info);
    UNUSED(op);
    return OB_SUCCESS;
  };

  virtual int rescan(ObExecContext& ctx) const
  {
    UNUSED(ctx);
    if (NULL == iter) {
      return OB_NOT_INIT;
    } else {
      return iter->rescan();
    }
  }

  ObPhyOperatorType op_type_;
};

}  // namespace common
}  // namespace oceanbase

#endif /* UNITTEST_SQL_OPTIMIZER_OB_STDIN_ITER_H_ */