#include "BasicBlock.h"
#include "Constant.h"
#include "Function.h"
#include "IRStmtBuilder.h"
#include "Module.h"
#include "Type.h"

#include <iostream>
#include <memory>
#include <vector>
#ifdef DEBUG  // 用于调试信息
#define DEBUG_OUTPUT std::cout << __LINE__ << std::endl;  // 输出行号的简单示例
#else
#define DEBUG_OUTPUT
#endif

#define CONST_INT(num) \
    ConstantInt::create(num, module)

#define CONST_FP(num) \
    ConstantFloat::create(num, module) // 得到常数值的表示
using namespace SysYF::IR;

int main()
{
    auto module = Module::create("SysY code while_test"); 
    auto builder = IRStmtBuilder::create(nullptr, module);
    SysYF::Ptr<Type> Int32Type = Type::get_int32_type(module);

    //全局变量a, b
    auto zero_initializer = ConstantZero::create(Int32Type, module);
    auto a = GlobalVariable::create("a", module, Int32Type, false, zero_initializer);
    auto b = GlobalVariable::create("b", module, Int32Type, false, zero_initializer);

    auto mainFunTy = FunctionType::create(Int32Type, {});
    auto mainFun = Function::create(mainFunTy, "main", module);
    auto main_entry_bb = BasicBlock::create(module, "main_entry", mainFun);
    builder->set_insert_point(main_entry_bb);

    auto retAlloca = builder->create_alloca(Int32Type);

    builder->create_store(CONST_INT(0), b);
    builder->create_store(CONST_INT(3), a);

    auto while_cond_bb = BasicBlock::create(module, "while_cond_bb", mainFun);
    auto while_true_bb = BasicBlock::create(module, "while_true_bb", mainFun);
    auto while_false_bb = BasicBlock::create(module, "while_false_bb", mainFun);

    builder->create_br(while_cond_bb);
    builder->set_insert_point(while_cond_bb);

    auto aLoad = builder->create_load(a);
    auto icmp = builder->create_icmp_gt(aLoad, CONST_INT(0));
    builder->create_cond_br(icmp, while_true_bb, while_false_bb);

    builder->set_insert_point(while_true_bb);
    auto bLoad = builder->create_load(b);
    aLoad = builder->create_load(a);
    auto add = builder->create_iadd(bLoad, aLoad);
    builder->create_store(add, b);
    auto sub = builder->create_isub(aLoad, CONST_INT(1));
    builder->create_store(sub, a);
    builder->create_br(while_cond_bb);

    builder->set_insert_point(while_false_bb);
    bLoad = builder->create_load(b);
    builder->create_store(bLoad, retAlloca);

    auto retLoad = builder->create_load(retAlloca);
    builder->create_ret(retLoad);

    std::cout << module->print();
    return 0;
}