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# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
# http://www.apache.org/licenses/LICENSE-2.0
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import argparse
import asyncio
import logging
from typing import Union

from pydantic import BaseModel

from dynamo.planner.utils.agg_planner import AggPlanner
from dynamo.planner.utils.decode_planner import DecodePlanner
from dynamo.planner.utils.disagg_planner import DisaggPlanner
from dynamo.planner.utils.planner_config import PlannerConfig
from dynamo.planner.utils.prefill_planner import PrefillPlanner
from dynamo.runtime import DistributedRuntime, dynamo_worker

logger = logging.getLogger(__name__)

# start planner 30 seconds after the other components to make sure planner can see them
# TODO: remove this delay
INIT_PLANNER_START_DELAY = 30


class RequestType(BaseModel):
    text: str


async def start_planner(runtime: DistributedRuntime, config: PlannerConfig):
    mode = config.mode
    planner: Union[DisaggPlanner, PrefillPlanner, DecodePlanner, AggPlanner]
    if mode == "disagg":
        planner = DisaggPlanner(runtime, config)
    elif mode == "prefill":
        planner = PrefillPlanner(runtime, config)
    elif mode == "decode":
        planner = DecodePlanner(runtime, config)
    elif mode == "agg":
        planner = AggPlanner(runtime, config)
    else:
        raise ValueError(f"Invalid planner mode: {mode}")
    await planner._async_init()
    await planner.run()


async def init_planner(runtime: DistributedRuntime, config: PlannerConfig):
    await asyncio.sleep(INIT_PLANNER_START_DELAY)

    await start_planner(runtime, config)

    async def generate(request: RequestType):
        """Dummy endpoint to satisfy that each component has an endpoint"""
        yield "mock endpoint"

    generate_endpoint = runtime.endpoint(f"{config.namespace}.Planner.generate")
    await generate_endpoint.serve_endpoint(generate)


def _parse_config() -> PlannerConfig:
    parser = argparse.ArgumentParser(description="Dynamo Planner")
    parser.add_argument(
        "--config",
        required=True,
        help="JSON string or path to a JSON/YAML config file",
    )
    args = parser.parse_args()
    return PlannerConfig.from_config_arg(args.config)


@dynamo_worker()
async def worker(runtime: DistributedRuntime):
    config = _parse_config()
    await init_planner(runtime, config)


def main():
    asyncio.run(worker())  # type: ignore[call-arg]


if __name__ == "__main__":
    main()
