# coding=utf-8
from __future__ import unicode_literals

import json
import os
import time

import _judger

from config import COMPILER_LOG_PATH, LOW_PRIVILEDGE_UID, LOW_PRIVILEDGE_GID
from exception import CompileError


class Compiler(object):
    def compile(self, compile_config, src_path, output_dir):
        command = compile_config["compile_command"]
        exe_path = os.path.join(output_dir, compile_config["exe_name"])
        command = command.format(src_path=src_path, exe_dir=output_dir, exe_path=exe_path)
        compiler_out = os.path.join(output_dir, str(time.time()) + "-compiler.out")
        _command = command.split(" ")

        result = _judger.run(max_cpu_time=compile_config["max_cpu_time"],
                             max_real_time=compile_config["max_real_time"],
                             max_memory=compile_config["max_memory"],
                             max_output_size=1024 * 1024,
                             max_process_number=20,
                             exe_path=_command[0],
                             # /dev/null is best, but in some system, this will call ioctl system call
                             input_path=src_path,
                             output_path=compiler_out,
                             error_path=compiler_out,
                             args=[item.encode("utf-8") for item in _command[1::]],
                             env=[("PATH=" + os.getenv("PATH")).encode("utf-8")],
                             log_path=COMPILER_LOG_PATH,
                             seccomp_rule_so_path=None,
                             uid=LOW_PRIVILEDGE_UID,
                             gid=LOW_PRIVILEDGE_GID)

        if result["result"] != _judger.RESULT_SUCCESS:
            with open(compiler_out) as f:
                error = f.read().strip()
            os.remove(compiler_out)
            if error:
                raise CompileError(error)
            raise CompileError("Compiler runtime error, info: %s" % json.dumps(result).decode("utf-8"))

        os.remove(compiler_out)
        return exe_path