#include "cool-tree.h"
#include "emit.h"
#include "symtab.h"
#include <assert.h>
#include <cstddef>
#include <cstdint>
#include <iostream>
#include <stdio.h>
#include <utility>
#include <vector>

enum Basicness { Basic, NotBasic, Trivial };
enum VariableLocation { Attribute, Stack };

#define TRUE 1
#define FALSE 0

class CgenClassTable;
typedef CgenClassTable *CgenClassTableP;

class CgenNode;
typedef CgenNode *CgenNodeP;

class BoolConst;

typedef std::vector<std::pair<class__class *, method_class *>> MethodListT;
typedef std::vector<attr_class *> AttrListT;

struct LocationTableItem {
  LocationTableItem(Symbol id, VariableLocation loc, int off)
      : id(id), location(loc), offset(off) {}
  Symbol id;
  VariableLocation location;
  int offset;
};

class LocationTable {
private:
  std::vector<LocationTableItem> table;
  std::vector<size_t> scope;
public:
  // lookup the inner-most item with the same id as name
  LocationTableItem* lookup(Symbol name) {
    for (auto itr = table.rbegin(); itr != table.rend(); ++ itr) {
      if (itr->id == name) {
        return &*itr;
      }
    }
    assert(0);
    return nullptr;
  }
  void add(LocationTableItem item) {
    table.push_back(item);
  };
  void enterscope() {
    scope.push_back(table.size());
  }
  void exitscope() {
    auto end = scope.back();
    scope.pop_back();
    table.erase(table.begin() + end, table.end());
  }
  void dump() {
    scope.push_back(table.size());
    for (size_t i = 0; i < scope.size() - 1; ++ i) {
      std::cerr << "scope" << i << "\n";
      for (size_t j = scope[i]; j < scope[i+1]; j ++) {
        std::cerr << table[j].id << ", " << table[j].location << ", " << table[j].offset << "\n";
      }
    }
    scope.pop_back();
  }
};

class CgenClassTable : public SymbolTable<Symbol, CgenNode> {
private:
  std::vector<CgenNode *> nodes;
  ostream &str;
  int stringclasstag;
  int intclasstag;
  int boolclasstag;
  IntEntry* _int_default = nullptr;
  StringEntry* _str_default = nullptr;
  BoolConst* _bool_default = nullptr;
  int label_count = 0; // an incremental counter to avoid label conflicts

  // The following methods emit code for
  // constants and global declarations.

  void code_global_data();
  void code_global_text();
  void code_bools(int);
  void code_select_gc();
  void code_constants();

  // The following creates an inheritance graph from
  // a list of classes.  The graph is implemented as
  // a tree of `CgenNode', and class names are placed
  // in the base class symbol table.

  void install_basic_classes();
  void install_class(CgenNodeP nd);
  void install_classes(Classes cs);
  void build_inheritance_tree();
  void set_relations(CgenNodeP nd);
  //* New Methods
  void dump_inheritance_tree();
  void code_class_nameTable();
  void code_dispatchTable();
  void code_prototypeObject();
  CgenNode *get_node(Symbol);
  void code_objectTab();
  void gen_init_code();

public:
  LocationTable loctab;
  Symbol expr_type_decl;
  CgenNode* cur_class;
  CgenClassTable(Classes, ostream &str);
  void code();
  CgenNode* root() { return nodes[0]; }
  /* aquire an unused label index */
  int alloc_label_index() { return label_count++; }
  IntEntry* int_default() const { return _int_default; };
  StringEntry* str_default() const { return _str_default; };
  BoolConst* bool_default() const { return _bool_default; };
  int get_method_index(Symbol class_name, Symbol method_name);
};

class CgenNode : public class__class {
private:
  CgenNodeP parentnd;               // Parent of class
  std::vector<CgenNode *> children; // Children of class
  Basicness basic_status;           // `Basic' if class is basic
                                    // `NotBasic' otherwise
  uint32_t _class_tag = 0;
  /* Allocate a class_tag on first scan increase in scanning order,
      starting from 1, so 0 is actually invalid by design
  */
  AttrListT attributes;
  // attr list including inherited
  MethodListT methods;
  // method list including inherited and overidden methods

public:
  CgenNode(Class_ c, Basicness bstatus);

  void add_child(CgenNodeP child);
  std::vector<CgenNode *> *get_children() { return &children; }
  void set_parentnd(CgenNodeP p);
  CgenNodeP get_parentnd() { return parentnd; }
  int basic() { return (basic_status == Basic); }
  uint32_t get_class_tag() { return _class_tag; }
  void set_class_tag(uint32_t val) { _class_tag = val; }
  void traverse_dump(int pad);
  uint32_t get_object_size() { return (3 + attributes.size()); }
  void traverse_generate_object();
  AttrListT *get_attributes() { return &attributes; };
  MethodListT *get_methods() { return &methods; };
};

class BoolConst {
private:
  int val;

public:
  BoolConst(int);
  void code_def(ostream &, int boolclasstag);
  void code_ref(ostream &) const;
};