"""Main entry point for the Voice to Notes Python sidecar."""

from __future__ import annotations

import signal
import sys

from voice_to_notes.ipc.handlers import (
    HandlerRegistry,
    hardware_detect_handler,
    make_diarize_handler,
    make_pipeline_handler,
    make_transcribe_handler,
    ping_handler,
)
from voice_to_notes.ipc.messages import ready_message
from voice_to_notes.ipc.protocol import read_message, write_message


def create_registry() -> HandlerRegistry:
    """Set up the message handler registry."""
    registry = HandlerRegistry()
    registry.register("ping", ping_handler)
    registry.register("transcribe.start", make_transcribe_handler())
    registry.register("hardware.detect", hardware_detect_handler)
    registry.register("diarize.start", make_diarize_handler())
    registry.register("pipeline.start", make_pipeline_handler())
    return registry


def main() -> None:
    """Main loop: read messages from stdin, dispatch to handlers, write responses to stdout."""

    # Handle clean shutdown
    def shutdown(signum: int, frame: object) -> None:
        print("[sidecar] Shutting down...", file=sys.stderr, flush=True)
        sys.exit(0)

    signal.signal(signal.SIGTERM, shutdown)
    signal.signal(signal.SIGINT, shutdown)

    registry = create_registry()

    # Signal to Rust that we're ready
    write_message(ready_message())
    print("[sidecar] Ready and waiting for messages", file=sys.stderr, flush=True)

    # Message loop
    while True:
        msg = read_message()
        if msg is None:
            # EOF — parent closed stdin, time to exit
            print("[sidecar] EOF on stdin, exiting", file=sys.stderr, flush=True)
            break

        response = registry.handle(msg)
        if response is not None:
            write_message(response)


if __name__ == "__main__":
    main()