import asyncio
from os import getenv

import db
import util
from processing import process

KEYNAME = "queue"

# Chunk size
CHUNK_SIZE = int(getenv("MONOLITH_INGEST_CHUNK_SIZE", "900"))
ITER_DELAY = float(getenv("MONOLITH_INGEST_ITER_DELAY", "0.5"))

INGEST_INCREASE_BELOW = int(getenv("MONOLITH_INGEST_INCREASE_BELOW", "2500"))
INGEST_DECREASE_ABOVE = int(getenv("MONOLITH_INGEST_DECREASE_ABOVE", "10000"))

INGEST_INCREASE_BY = int(getenv("MONOLITH_INGEST_INCREASE_BY", "100"))
INGEST_DECREASE_BY = int(getenv("MONOLITH_INGEST_DECREASE_BY", "100"))
log = util.get_logger("ingest")

INGEST_MAX = int(getenv("MONOLITH_INGEST_MAX", "1000000"))
INGEST_MIN = int(getenv("MONOLITH_INGEST_MIN", "100"))

class Ingest(object):
    def __init__(self):
        name = self.__class__.__name__
        self.log = util.get_logger(name)
        self.current_chunk = 0
        self.log.info(
            (
                "Starting ingest handler for chunk size of "
                f"{CHUNK_SIZE} every {ITER_DELAY} seconds."
            )
        )

    async def run(self):
        while True:
            await self.get_chunk()
            self.log.debug(f"Ingest chunk {self.current_chunk} complete")
            self.current_chunk += 1
            await asyncio.sleep(ITER_DELAY)

    async def get_chunk(self):
        global CHUNK_SIZE
        length = await db.ar.llen(KEYNAME)
        if length > CHUNK_SIZE:
            length = CHUNK_SIZE
        if not length:
            return
        ingested = await process.spawn_processing_threads(self.current_chunk, length)

        if ingested < INGEST_INCREASE_BELOW:
            if CHUNK_SIZE + INGEST_INCREASE_BY < INGEST_MAX:
                self.log.info(
                    (
                        f"Increasing chunk size to "
                        f"{CHUNK_SIZE + INGEST_INCREASE_BY} "
                        f"due to low ingestion ({ingested})"
                    )
                )
                CHUNK_SIZE += INGEST_INCREASE_BY
            else:
                log.info(f"Chunk size ({CHUNK_SIZE}) at maximum, not increasing above: {INGEST_MAX}")

        elif ingested > INGEST_DECREASE_ABOVE:
            if CHUNK_SIZE - INGEST_DECREASE_BY > INGEST_MIN:
                self.log.info(
                    (
                        f"Decreasing chunk size to "
                        f"{CHUNK_SIZE - INGEST_DECREASE_BY}"
                        f"due to high ingestion ({ingested})"
                    )
                )
                CHUNK_SIZE -= INGEST_DECREASE_BY
            else:
                log.info(f"Chunk size ({CHUNK_SIZE}) at minimum, not decreasing below: {INGEST_MIN}")