#include "Compiler.hpp"
#include "lib/Opcodes.hpp"
#include "Code.hpp"

namespace jk
{
  /*explicit*/ Compiler::Compiler(Logger& logger)
    : m_logger(logger)
  {
  }

  /*virtual*/ Compiler::~Compiler()
  {
  }

  void Compiler::compile(std::shared_ptr<Node> node,
                         std::shared_ptr<Program> program,
                         std::shared_ptr<SymTable> sym)
  {
    switch (node->type())
      {
      case NODE_PROG:
      case NODE_BODY: {
        for (size_t i=0; i<node->size(); i++)
          {
            compile(node->child(i).lock(), program, sym);
          }
      } break;

      case NODE_FUNCALL: {
        for (size_t i=0; i<node->size(); i++)
          {
            compile(node->child(i).lock(), program, sym);
          }

        program->push_instr(OPCODE_CALL, node->size() - 1);
      } break;

      case NODE_VARDECL: {
        std::string ident = node->child(0).lock()->repr();
        auto entry = sym->find(ident);
        assert(entry);

        compile(node->child(1).lock(), program, sym);
        program->push_instr(OPCODE_STORE, entry->addr);
      } break;

      case NODE_LAMBDA: {
        auto params = node->child(0).lock();
        auto body = node->child(1).lock();
        auto prog = std::make_shared<Program>();
        auto fun_sym = std::make_shared<SymTable>(m_logger, sym);

        for (size_t i=0; i<params->size(); i++)
          {
            std::string param = params->child(i).lock()->repr();
            fun_sym->declare(param,
                         std::make_shared<Type>(TYPE_NIL),
                         node->loc());
          }

        compile(body, prog, fun_sym);
        prog->push_instr(OPCODE_RET);

        auto code = std::make_shared<Code>(prog);
        size_t addr = program->push_constant(Value::make_code(code));
        program->push_instr(OPCODE_PUSH_CONST, addr);
        program->push_instr(OPCODE_MK_FUNCTION);
      } break;

      case NODE_IDENT: {
        std::string ident = node->repr();
        auto mysym = sym->find(ident);
        assert(sym);

        OpcodeType op_load = OPCODE_LOAD;

        if (mysym->is_global)
          {
            op_load = OPCODE_LOAD_GLOBAL;
          }

        program->push_instr(op_load, mysym->addr);

      } break;

      case NODE_INT: {
        auto value = Value::make_int(std::stoi(node->repr()));
        size_t addr = program->push_constant(value);
        program->push_instr(OPCODE_PUSH_CONST, addr);
      } break;

      case NODE_BOOL: {
        auto value = Value::make_bool(node->repr() == "true");
        size_t addr = program->push_constant(value);
        program->push_instr(OPCODE_PUSH_CONST, addr);
      } break;

      default:
        std::cerr << "cannot compile unknown node '"
                  << NodeTypeStr[node->type()] << "'" << std::endl;
        abort();

      }
  }

}