#include <exception>
#include <iostream>
#include <stdexcept>

#include "frontend/AntlrDriver.h"
#include "frontend/SyntaxTreePrinter.h"
#if !COMPILER_PARSE_ONLY
#include "ir/IR.h"
#include "ir/PassManager.h"
#include "irgen/IRGen.h"
#include "mir/MIR.h"
#include "sem/Sema.h"
#endif
#include "utils/CLI.h"
#include "utils/Log.h"

int main(int argc, char** argv) {
  try {
    auto opts = ParseCLI(argc, argv);
    if (opts.show_help) {
      PrintHelp(std::cout);
      return 0;
    }

    auto antlr = ParseFileWithAntlr(opts.input);
    bool need_blank_line = false;
    if (opts.emit_parse_tree) {
      PrintSyntaxTree(antlr.tree, antlr.parser.get(), std::cout);
      need_blank_line = true;
    }

#if !COMPILER_PARSE_ONLY
    auto* comp_unit = dynamic_cast<SysYParser::CompUnitContext*>(antlr.tree);
    if (!comp_unit) {
      throw std::runtime_error(FormatError("main", "syntax tree root is not compUnit"));
    }

    auto sema = RunSema(*comp_unit);

    std::unique_ptr<ir::Module> asm_module;
    if (opts.emit_asm) {
      asm_module = GenerateIR(*comp_unit, sema);
      ir::RunIRPassPipeline(*asm_module);
    }

    if (opts.emit_ir) {
      std::unique_ptr<ir::Module> ir_module;
      if (opts.emit_asm) {
        ir_module = GenerateIR(*comp_unit, sema);
      } else {
        ir_module = GenerateIR(*comp_unit, sema);
      }
      ir::RunIRPassPipeline(*ir_module);

      if (need_blank_line) {
        std::cout << "\n";
      }
      ir::IRPrinter printer;
      printer.Print(*ir_module, std::cout);
      need_blank_line = true;
    }

    if (opts.emit_asm) {
      auto machine_module = mir::LowerToMIR(*asm_module);
      mir::RunMIRPreRegAllocPassPipeline(*machine_module);
      mir::RunRegAlloc(*machine_module);
      mir::RunMIRPostRegAllocPassPipeline(*machine_module);
      mir::RunFrameLowering(*machine_module);
      if (need_blank_line) {
        std::cout << "\n";
      }
      mir::PrintAsm(*machine_module, std::cout);
    }
#else
    if (opts.emit_ir || opts.emit_asm) {
      throw std::runtime_error(
          FormatError("main", "IR/asm emission is unavailable in parse-only builds"));
    }
#endif
  } catch (const std::exception& ex) {
    PrintException(std::cerr, ex);
    return 1;
  }
  return 0;
}