/**
 * Copyright 2019-2020 Huawei Technologies Co., Ltd
 *
 * 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 "debug/trace.h"

#include <iostream>
#include <fstream>
#include <map>
#include <unordered_map>
#include <vector>
#include <string>
#include <sstream>
#include <utility>
#include <stack>
#include <algorithm>

#include "ir/meta_func_graph.h"
#include "utils/graph_utils.h"
#include "operator/composite/composite.h"
#include "ir/tensor.h"
#include "debug/anf_ir_utils.h"
#include "pipeline/static_analysis/evaluator.h"

namespace mindspore {
// namespace to support debug trace infomation
namespace trace {
using abstract::AbstractBasePtr;
using abstract::AnalysisContextPtr;
using abstract::AnalysisEnginePtr;
using abstract::AnfNodeConfigPtr;

std::string GetAbstractStr(const abstract::AbstractBasePtr &abs) {
  if (abs == nullptr) {
    return "Null Abstract";
  }
  auto shape = abs->BuildShape()->cast<abstract::ShapePtr>();
  TypePtr type = abs->BuildType();
  std::ostringstream oss;
  if ((shape != nullptr) && (type != nullptr)) {
    oss << type->DumpText() << shape->DumpText();
  } else if (type != nullptr) {
    oss << type->DumpText();
  } else {
    oss << "Undefined";
  }
  return oss.str();
}

std::string GetGraphParamString(const FuncGraphPtr &graph, abstract::AbstractBasePtrList args_spec_list) {
  std::ostringstream oss;
  oss << "graph:" << graph->ToString() << " with args[";
  auto params = graph->parameters();
  for (size_t i = 0; i < args_spec_list.size(); i++) {
    oss << params[i]->ToString() << ":<" << GetAbstractStr(args_spec_list[i]) << ">,";
  }
  oss << "]";
  oss << GetDebugInfo(graph->debug_info(), kSourceLineTipDiscard);
  return oss.str();
}

void DumpInferStack(std::ostringstream &oss) {
  auto &infer_stack = GetCurrenGraphInferStack();
  if (infer_stack.empty()) {
    return;
  }
  std::vector<std::pair<abstract::EvaluatorPtr, abstract::AnfNodeConfigPtr>> infer_vec;
  while (!infer_stack.empty()) {
    auto top = infer_stack.top();
    infer_vec.push_back(top);
    infer_stack.pop();
  }
  std::reverse(infer_vec.begin(), infer_vec.end());
  int index = 0;
  for (auto &item : infer_vec) {
    auto graph_infer = std::dynamic_pointer_cast<abstract::BaseFuncGraphEvaluator>(item.first);
    if (graph_infer == nullptr) {
      MS_LOG(WARNING) << "DumpInferStack failed, got null graph evaluator";
      infer_vec.clear();
      break;
    }
    auto graph_context = graph_infer->graph_context();
    if (graph_context == nullptr) {
      MS_LOG(INFO) << "Null context continue";
      continue;
    }
    auto graph = graph_context->func_graph();
    auto args_spec_list = graph_context->args_spec_list();
    oss << "    #" << index++ << " " << GetGraphParamString(graph, args_spec_list);
  }
}

void TraceGraphEval() {
  auto &infer_stack = GetCurrenGraphInferStack();
  std::ostringstream oss;
  if (infer_stack.empty()) {
    return;
  }
  MS_LOG(INFO) << "\n*******************************graph evaluate stack**********************************";
  oss << std::endl;
  DumpInferStack(oss);
  MS_LOG(INFO) << oss.str();
  MS_LOG(INFO) << "\n*************************************************************************************";
}

class AnalyzedFuncGraphExporter : public AnfExporter {
 public:
  AnalyzedFuncGraphExporter() : AnfExporter("", true, false) {}
  ~AnalyzedFuncGraphExporter() override = default;

  void ExportFuncGraph(const std::string &filename, const std::vector<abstract::AnfNodeConfigPtr> &node_cfgs);

  void ExportOneFuncGraph(std::ofstream &ofs, const FuncGraphPtr &func_graph);
  void OutputCNodes(std::ofstream &ofs, const std::vector<AnfNodePtr> &nodes, const FuncGraphPtr &func_graph);
  void OutputCNode(std::ofstream &ofs, const CNodePtr &cnode, const FuncGraphPtr &func_graph, int *idx,
                   std::map<AnfNodePtr, int> *const apply_map);

 private:
  std::string GetNodeType(const AnfNodePtr &nd) override;
  AbstractBasePtr GetNodeAbstract(const AnfNodePtr &nd);
  AnfNodeConfigPtr GetFordwardConfigPtr(const AnfNodeConfigPtr &cfg);
  AnalysisContextPtr ProcessFuncGraphCall(const CNodePtr &node);

  // key: context, val: whether the context has already been printed
  std::unordered_map<AnalysisContextPtr, bool> context_map_;
  std::vector<AnalysisContextPtr> context_vec_;

  AnalysisContextPtr cur_ctx_ = nullptr;
  AnalysisEnginePtr engine_ = nullptr;
};

std::unordered_map<FuncGraphPtr, TaggedNodeMap> CalcTaggedFuncGraphs() {
  std::unordered_map<FuncGraphPtr, TaggedNodeMap> tagged_func_graphs;
  auto &list = GetCNodeDebugStack();
  for (size_t i = 0; i < list.size(); ++i) {
    auto node_cfg = list[i];
    auto fg = node_cfg->context()->func_graph();
    auto node = node_cfg->node();
    tagged_func_graphs[fg][node] = i;
  }
  return tagged_func_graphs;
}

void OutputAnalyzedGraphWithType() {
  AnalyzedFuncGraphExporter exporter;
  exporter.ExportFuncGraph("analyze_fail.dat", GetCNodeDebugStack());
}

std::string AnalyzedFuncGraphExporter::GetNodeType(const AnfNodePtr &node) {
  if (cur_ctx_ == nullptr) {
    return AnfExporter::GetNodeType(node);
  }

  MS_EXCEPTION_IF_NULL(engine_);
  auto cfg = engine_->MakeConfig(node, cur_ctx_);
  auto ret = engine_->cache().GetValue(cfg);
  if (ret == nullptr) {
    return "Undefined";
  }
  auto abs = ret->abstract();
  if (abs == nullptr) {
    return "Undefined";
  }
  auto dtype = abs->BuildType();
  auto shape = abs->BuildShape();
  std::ostringstream oss;
  if (dtype != nullptr && abs->isa<abstract::AbstractTensor>() && shape != nullptr) {
    oss << dtype->DumpText() << shape->DumpText();
  } else if (dtype != nullptr) {
    oss << dtype->DumpText();
  } else {
    oss << "Undefined";
  }
  return oss.str();
}

AbstractBasePtr AnalyzedFuncGraphExporter::GetNodeAbstract(const AnfNodePtr &node) {
  if (cur_ctx_ == nullptr) {
    return nullptr;
  }
  MS_EXCEPTION_IF_NULL(engine_);
  auto cfg = engine_->MakeConfig(node, cur_ctx_);
  auto ret = engine_->cache().GetValue(cfg);
  return ret == nullptr ? nullptr : ret->abstract();
}

AnfNodeConfigPtr AnalyzedFuncGraphExporter::GetFordwardConfigPtr(const AnfNodeConfigPtr &cfg) {
  AnfNodeConfigPtr cur_cfg = cfg;
  auto iter = engine_->anfnode_config_map().find(cur_cfg);
  while (iter != engine_->anfnode_config_map().end()) {
    auto node = cur_cfg->node();
    cur_cfg = iter->second;
    MS_LOG(DEBUG) << "Get forword node: " << node.get() << "[" << node->ToString() << "] --> " << cur_cfg->node().get()
                  << "[" << cur_cfg->node()->ToString() << "]";
    iter = engine_->anfnode_config_map().find(cur_cfg);
  }
  return cur_cfg;
}

AnalysisContextPtr AnalyzedFuncGraphExporter::ProcessFuncGraphCall(const CNodePtr &node) {
  if (node == nullptr) {
    return nullptr;
  }
  auto cfg = engine_->MakeConfig(node, cur_ctx_);
  cfg = GetFordwardConfigPtr(cfg);
  auto cnode = dyn_cast<CNode>(cfg->node());
  if (cnode == nullptr) {
    MS_LOG(DEBUG) << "CNode is nullptr";
    return nullptr;
  }
  const auto &inputs = cnode->inputs();
  auto op_abs = GetNodeAbstract(inputs[0]);
  if (op_abs == nullptr) {
    MS_LOG(DEBUG) << "Abstract of inputs[0] of cnode " << cnode->ToString() << "  is nullptr";
    return nullptr;
  }

  if (!op_abs->isa<abstract::FuncGraphAbstractClosure>() && !op_abs->isa<abstract::MetaFuncGraphAbstractClosure>()) {
    MS_LOG(DEBUG) << "Inputs[0] of cnode " << cnode->ToString() << " is of type " << op_abs->type_name()
                  << ", not function, ignore it";
    return nullptr;
  }

  auto evaluator = engine_->GetEvaluatorFor(dyn_cast<abstract::AbstractFunction>(op_abs));
  if (!evaluator->isa<abstract::BaseFuncGraphEvaluator>()) {
    MS_LOG(DEBUG) << "Evaluator for inputs[0] of cnode " << cnode->ToString() << " is of type "
                  << evaluator->type_name() << ", not BaseFuncGraphEvaluator, ignore it.";
    return nullptr;
  }

  auto base_fg_evaluator = dyn_cast<abstract::BaseFuncGraphEvaluator>(evaluator);
  auto ctx = base_fg_evaluator->graph_context();
  if (ctx != nullptr && context_map_.insert({ctx, false}).second) {
    MS_LOG(DEBUG) << "Add new context, ctx.addr = " << ctx.get() << "ctx = " << ctx->ToString();
    context_vec_.push_back(ctx);
  }
  return ctx;
}

void AnalyzedFuncGraphExporter::OutputCNode(std::ofstream &ofs, const CNodePtr &cnode, const FuncGraphPtr &func_graph,
                                            int *idx, std::map<AnfNodePtr, int> *const apply_map) {
  auto &inputs = cnode->inputs();
  std::string op_text = GetAnfNodeText(func_graph, inputs[0], *apply_map);
  // non-return node
  if (cnode != func_graph->get_return()) {
    int apply_idx = (*idx)++;
    (*apply_map)[cnode] = apply_idx;
    std::string type_info = GetNodeType(cnode);
    if (type_info == "Undefined") {
      ofs << "    %" << apply_idx << " = " << op_text << "(";
    } else {
      ofs << "    %" << apply_idx << " : " << type_info << " = " << op_text << "(";
    }
  } else {
    ofs << "    " << op_text << "(";
  }

  for (size_t i = 1; i < inputs.size(); ++i) {
    if (i != 1) {
      ofs << ", ";
    }
    AnfNodePtr arg = inputs[i];
    ofs << GetAnfNodeText(func_graph, arg, *apply_map);
  }
  ofs << ")";

  // process function graph call
  auto ctx = ProcessFuncGraphCall(cnode);

  // output comment
  OutputStatementComment(ofs, cnode);
  if (ctx != nullptr) {
    ofs << " @ctx.addr=" << ctx.get();
  }
  ofs << "\n";

  if (label_manage::GetGlobalTraceLabelType() == label_manage::TraceLabelType::kWithUniqueId) {
    ofs << trace::GetDebugInfo(cnode->debug_info(), "      # ", kSourceLineTipDiscard) << "#"
        << label_manage::Label(cnode->debug_info()) << "\n";
  } else {
    ofs << trace::GetDebugInfo(cnode->debug_info(), "      # ", kSourceLineTipDiscard) << "\n";
  }
}

void AnalyzedFuncGraphExporter::OutputCNodes(std::ofstream &ofs, const std::vector<AnfNodePtr> &nodes,
                                             const FuncGraphPtr &func_graph) {
  if (func_graph == nullptr) {
    return;
  }

  int idx = 1;
  std::map<AnfNodePtr, int> apply_map;
  for (const AnfNodePtr &node : nodes) {
    MS_EXCEPTION_IF_NULL(node);
    if (!node->isa<CNode>()) {
      continue;
    }

    auto iter = tagged_cnodes_.find(node);
    if (iter != tagged_cnodes_.end()) {
      ofs << "\n#------------------------> " << iter->second << "\n";
    }

    auto cnode = node->cast<CNodePtr>();
    OutputCNode(ofs, cnode, func_graph, &idx, &apply_map);
  }
}

void AnalyzedFuncGraphExporter::ExportOneFuncGraph(std::ofstream &ofs, const FuncGraphPtr &func_graph) {
  if (func_graph == nullptr) {
    return;
  }

  std::vector<AnfNodePtr> nodes = TopoSort(func_graph->get_return(), SuccIncoming, AlwaysInclude);
  std::vector<AnfNodePtr> parameters = func_graph->parameters();
  OrderedMap<AnfNodePtr, int, ParamPtrHasher, ParamPtrEqual> param_map;

  ofs << "# [No." << (exported.size() + 1) << "] " << func_graph->DumpText() << "."
      << func_graph->debug_info()->get_id();
  if (cur_ctx_ != nullptr) {
    ofs << " @ctx.addr=" << cur_ctx_.get();
  }
  ofs << "\n";
  if (label_manage::GetGlobalTraceLabelType() == label_manage::TraceLabelType::kWithUniqueId) {
    ofs << trace::GetDebugInfo(func_graph->debug_info(), "# ", kSourceLineTipDiscard) << "#"
        << label_manage::Label(func_graph->debug_info()) << "\n";
  } else {
    ofs << trace::GetDebugInfo(func_graph->debug_info(), "# ", kSourceLineTipDiscard) << "\n";
  }
  ofs << "funcgraph fg_" << func_graph->debug_info()->get_id();
  // output name of parent of graph if exists
  if (func_graph->parent() != nullptr) {
    ofs << "[fg_" << func_graph->parent()->debug_info()->get_id() << "]";
  }
  ofs << "(\n";

  OutputParameters(ofs, parameters, &param_map);

  exported[func_graph] = param_map;
  ofs << (!parameters.empty() ? "    " : "") << ") {\n";

  OutputCNodes(ofs, nodes, func_graph);

  ofs << "}\n";
}

void AnalyzedFuncGraphExporter::ExportFuncGraph(const std::string &filename,
                                                const std::vector<abstract::AnfNodeConfigPtr> &node_cfgs) {
  if (node_cfgs.empty()) {
    MS_LOG(DEBUG) << "Node configs is empty";
    return;
  }

  context_map_.clear();
  context_vec_.clear();

  std::ofstream ofs(filename);
  if (!ofs.is_open()) {
    MS_LOG(ERROR) << "Open file '" << filename << "' failed!";
    return;
  }

  param_index = 1;
  auto tagged_func_graphs = CalcTaggedFuncGraphs();

  // first output graph on the analysis stack
  for (const auto &node_cfg : node_cfgs) {
    auto ctx = node_cfg->context();
    if (engine_ == nullptr) {
      engine_ = node_cfg->engine();
    }
    if (context_map_.insert({ctx, false}).second) {
      context_vec_.push_back(ctx);
    }
    // the graph has already been printed
    if (context_map_[ctx]) {
      continue;
    }
    context_map_[ctx] = true;

    auto fg = ctx->func_graph();

    // set current context
    cur_ctx_ = ctx;
    tagged_cnodes_ = tagged_func_graphs[fg];
    ExportOneFuncGraph(ofs, fg);
    ofs << "\n\n";
  }

  tagged_cnodes_.clear();

  // print seperator between function graphs on analyzed graph call stack and others
  ofs << "#===============================================================================\n\n\n";

  // second output other graphs
  size_t ctx_idx = 0;
  while (ctx_idx < context_vec_.size()) {
    auto ctx = context_vec_[ctx_idx++];
    if (context_map_[ctx]) {
      continue;
    }
    context_map_[ctx] = true;
    cur_ctx_ = ctx;
    ExportOneFuncGraph(ofs, ctx->func_graph());
    ofs << "\n\n";
  }

  ofs << "# num of total function graphs: " << context_map_.size() << "\n";

  ofs.close();
}

void GetEvalStackInfo(std::ostringstream &oss) {
  MS_LOG(INFO) << "Get graph analysis information begin";
  auto stack = GetCNodeDebugStack();
  if (stack.empty()) {
    MS_LOG(INFO) << "Length of analysis information stack is empty.";
    return;
  }

  OutputAnalyzedGraphWithType();
  oss << "\nThe function call stack:\n";

  int index = 0;
  std::string last_py_func = "";
  for (size_t i = 0; i < stack.size(); ++i) {
    auto node_cfg = stack[i];

    auto cnode = dyn_cast<CNode>(node_cfg->node());
    if (cnode == nullptr) {
      MS_LOG(DEBUG) << "CNode of elements[" << i << "] is nullptr.";
      continue;
    }

    auto debug_info = cnode->debug_info();
    auto this_py_func = debug_info->get_python_func_belonged();
    if (i > 0 && (this_py_func == last_py_func)) {
      MS_LOG(DEBUG) << "Python function of elements[" << i << "] is same as previous.";
      continue;
    }
    last_py_func = this_py_func;
    oss << "# " << index++ << " " << trace::GetDebugInfo(debug_info, std::string(""));
  }

  stack.clear();
  MS_LOG(INFO) << "Get graph analysis information *end*";
}

// trace the graph evaluator stack
static std::stack<std::pair<abstract::EvaluatorPtr, abstract::AnfNodeConfigPtr>> graph_infer_stack;
// trace the cnode infer debug info
static std::vector<abstract::AnfNodeConfigPtr> cnode_debug_stack{};
void TraceGraphEvalEnter(const abstract::EvaluatorPtr &eval, const abstract::AnfNodeConfigPtr &node) {
  if (eval == nullptr) {
    MS_LOG(EXCEPTION) << "GraphInferEnter got null eval";
  }
  if (eval->isa<abstract::FuncGraphEvaluator>() || eval->isa<abstract::MetaFuncGraphEvaluator>()) {
    graph_infer_stack.emplace(std::pair<abstract::EvaluatorPtr, abstract::AnfNodeConfigPtr>(eval, node));
  }
}

void TraceGraphEvalLeave(const abstract::EvaluatorPtr &eval) {
  if (eval == nullptr) {
    MS_LOG(EXCEPTION) << "GraphInferEnter got null eval";
  }
  if (eval->isa<abstract::FuncGraphEvaluator>() || eval->isa<abstract::MetaFuncGraphEvaluator>()) {
    graph_infer_stack.pop();
  }
}

void TraceEvalCNodeEnter(const abstract::AnfNodeConfigPtr &node_cfg) { cnode_debug_stack.push_back(node_cfg); }

void TraceEvalCNodeLeave() { cnode_debug_stack.pop_back(); }

std::vector<abstract::AnfNodeConfigPtr> &GetCNodeDebugStack() { return cnode_debug_stack; }

std::stack<std::pair<abstract::EvaluatorPtr, abstract::AnfNodeConfigPtr>> &GetCurrenGraphInferStack() {
  return graph_infer_stack;
}
void ClearTraceStack() {
  while (!graph_infer_stack.empty()) {
    graph_infer_stack.pop();
  }
  cnode_debug_stack.clear();
}
}  // namespace trace
}  // namespace mindspore