/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
/*!
 * \file span.cc
 * \brief The span data structure.
 */
#include <tvm/ir/span.h>
#include <tvm/runtime/registry.h>

#include <algorithm>

namespace tvm {

ObjectPtr<Object> GetSourceNameNode(const String& name) {
  // always return pointer as the reference can change as map re-allocate.
  // or use another level of indirection by creating a unique_ptr
  static std::unordered_map<String, ObjectPtr<SourceNameNode> > source_map;

  auto sn = source_map.find(name);
  if (sn == source_map.end()) {
    ObjectPtr<SourceNameNode> n = make_object<SourceNameNode>();
    source_map[name] = n;
    n->name = std::move(name);
    return n;
  } else {
    return sn->second;
  }
}

ObjectPtr<Object> GetSourceNameNodeByStr(const std::string& name) {
  return GetSourceNameNode(name);
}

SourceName SourceName::Get(const String& name) { return SourceName(GetSourceNameNode(name)); }

TVM_REGISTER_GLOBAL("ir.SourceName").set_body_typed(SourceName::Get);

TVM_STATIC_IR_FUNCTOR(ReprPrinter, vtable)
    .set_dispatch<SourceNameNode>([](const ObjectRef& ref, ReprPrinter* p) {
      auto* node = static_cast<const SourceNameNode*>(ref.get());
      p->stream << "SourceName(" << node->name << ", " << node << ")";
    });

TVM_REGISTER_NODE_TYPE(SourceNameNode)
    .set_creator(GetSourceNameNodeByStr)
    .set_repr_bytes([](const Object* n) -> std::string {
      return static_cast<const SourceNameNode*>(n)->name;
    });

Span::Span(SourceName source_name, int line, int end_line, int column, int end_column) {
  auto n = make_object<SpanNode>();
  n->source_name = std::move(source_name);
  n->line = line;
  n->end_line = end_line;
  n->column = column;
  n->end_column = end_column;
  data_ = std::move(n);
}

Span Span::Merge(const Span& other) const {
  ICHECK(this->defined() && other.defined()) << "Span::Merge: both spans must be defined";

  ICHECK((*this)->source_name == other->source_name);
  return Span((*this)->source_name, std::min((*this)->line, other->line),
              std::max((*this)->end_line, other->end_line),
              std::min((*this)->column, other->column),
              std::max((*this)->end_column, other->end_column));
}

TVM_REGISTER_NODE_TYPE(SpanNode);

TVM_REGISTER_GLOBAL("ir.Span").set_body_typed([](SourceName source_name, int line, int end_line,
                                                 int column, int end_column) {
  return Span(source_name, line, end_line, column, end_column);
});

TVM_STATIC_IR_FUNCTOR(ReprPrinter, vtable)
    .set_dispatch<SpanNode>([](const ObjectRef& ref, ReprPrinter* p) {
      auto* node = static_cast<const SpanNode*>(ref.get());
      p->stream << "Span(" << node->source_name << ", " << node->line << ", " << node->end_line
                << ", " << node->column << ", " << node->end_column << ")";
    });
}  // namespace tvm