import time, signal, random, os, json
from enum import Enum
from uuid import UUID, uuid4

class JobStatus(Enum):
    QUEUED = 1
    FINISHED = 2
    ERRORED = 3

class TimeWaster:
    def __init__(self):
        self.running = True
        self.jobs: list[JobResult] = []
        if (os.path.exists("waster.log")): os.remove("waster.log")
        self.logfd = os.open("waster.log", os.O_CREAT | os.O_WRONLY)
        signal.signal(signal.SIGUSR1, self.handleCancelJob)

    def handleNewJob(self):
        msg = os.read(0, 1024)
        msgs = msg.decode().split("<END>")
        msgs.pop()
        for message in msgs:
            self.log(f"Got job: \"{message}\"")
            data = json.loads(message)
            self.jobs.append(JobResult(data["ID"], JobStatus.QUEUED, "exists i guess"))
        # os.write(1, self.jobs[jobId])

    def handleCancelJob(self, signum, stack):
        while (len(self.jobs) > 0):
            canceled: JobResult = self.jobs.pop(0)
            self.log(f"Job Canceled: {canceled.id}")
            self.back = True

    def quit(self):
        self.running = False

    def main(self):
        while self.running:
            self.back = False
            if (len(self.jobs) == 0):
                self.handleNewJob()
            else:
                if (self.back): continue
                job: JobResult = self.jobs[0]
                if (self.back): continue
                time.sleep(random.randrange(1, 10) / 10)
                if (self.back): continue
                job.status = JobStatus.FINISHED
                job.result = f"done i guess"
                os.write(1, f"{{\"ID\":{job.id},\"status\":{job.status.value},\"result\":\"{job.result}\"}}<END>".encode())
                self.jobs.remove(job)
                self.log(f"Finished Job: {job.id}")
    
    def log(self, msg: str):
        os.write(self.logfd, f"{msg}\n".encode())

class JobResult:
    def __init__(self, id: int, status: JobStatus, result) -> None:
        self.id = id
        self.status = status
        self.result = result

if __name__ == "__main__":
    TimeWaster().main()
    # while (True):
    #     data = os.read(0, 100).decode()
    #     print(data)
    #     if (data == "QUIT"): break