#!/usr/bin/env python3
"""
Apollo AGC Integration Demo -- full communications loop with Virtual AGC.

Demonstrates the complete Apollo unified S-band communications path:

    yaAGC (emulator)
      |  DNTM1/DNTM2 telemetry via TCP
      v
    agc_bridge
      |  PDU message
      v
    downlink_decoder --> print decoded telemetry
      ^
      |  PDU frames
    usb_downlink_receiver (RX chain)
      ^
      |  complex baseband
    usb_signal_source (TX chain)

And the uplink path:

    DSKY commands
      |
    uplink_encoder
      |  (channel, value) pairs
      v
    agc_bridge --> yaAGC (INLINK channel 045)

Prerequisites:
    1. Install Virtual AGC: https://www.ibiblio.org/apollo/
    2. Start yaAGC with a mission (e.g., Luminary099 for Apollo 11 LM):
       $ yaAGC --core=Luminary099.bin --port=19697
    3. Optionally start yaDSKY2 for visual display:
       $ yaDSKY2 --port=19698

Usage:
    uv run python examples/agc_loopback_demo.py
    uv run python examples/agc_loopback_demo.py --host 192.168.1.100
    uv run python examples/agc_loopback_demo.py --port 19697
    uv run python examples/agc_loopback_demo.py --send-v16n36  # request time display
"""

import argparse
import sys
import time

from apollo.agc_bridge import AGCBridgeClient
from apollo.constants import (
    AGC_CH_DNTM1,
    AGC_CH_DNTM2,
    AGC_CH_OUTLINK,
    AGC_PORT_BASE,
)
from apollo.downlink_decoder import DownlinkEngine
from apollo.uplink_encoder import UplinkEncoder


def main():
    parser = argparse.ArgumentParser(
        description="Apollo AGC integration demo -- connect to yaAGC emulator"
    )
    parser.add_argument("--host", default="localhost", help="yaAGC host (default: localhost)")
    parser.add_argument("--port", type=int, default=AGC_PORT_BASE,
                        help="yaAGC port (default: 19697)")
    parser.add_argument("--duration", type=float, default=10.0, help="Run duration in seconds")
    parser.add_argument("--send-v16n36", action="store_true",
                        help="Send V16N36E (display time) to AGC")
    args = parser.parse_args()

    print("=" * 60)
    print("Apollo AGC Integration Demo")
    print("=" * 60)
    print(f"  Target:    {args.host}:{args.port}")
    print(f"  Duration:  {args.duration} seconds")
    print()

    # Downlink decoder accumulates telemetry words
    decoder = DownlinkEngine()
    packet_count = 0
    telemetry_words = 0

    def on_packet(channel: int, value: int):
        nonlocal packet_count, telemetry_words
        packet_count += 1

        if channel in (AGC_CH_DNTM1, AGC_CH_DNTM2):
            telemetry_words += 1
            decoder.feed_agc_word(channel, value)
        elif channel == AGC_CH_OUTLINK:
            print(f"  OUTLINK: ch={channel:03o} val={value:05o} ({value})")

    def on_status(state: str):
        print(f"  Connection: {state}")

    # Connect to yaAGC
    client = AGCBridgeClient(
        host=args.host,
        port=args.port,
        channel_filter=None,  # accept all channels for this demo
        on_packet=on_packet,
        on_status=on_status,
    )

    print(f"Connecting to yaAGC at {args.host}:{args.port}...")
    client.start()

    # Wait for connection
    for _ in range(20):  # 10 seconds max
        if client.connected:
            break
        time.sleep(0.5)

    if not client.connected:
        print()
        print("Could not connect to yaAGC.")
        print()
        print("Make sure yaAGC is running:")
        print(f"  yaAGC --core=Luminary099.bin --port={args.port}")
        print()
        print("Or try a different host/port:")
        print("  python examples/agc_loopback_demo.py --host <ip> --port <port>")
        client.stop()
        sys.exit(1)

    print()

    # Optionally send a DSKY command
    if args.send_v16n36:
        print("Sending V16N36E (display time)...")
        encoder = UplinkEncoder()
        pairs = encoder.encode_verb_noun(verb=16, noun=36)
        for channel, value in pairs:
            client.send(channel, value)
            time.sleep(0.1)  # pace for UPRUPT processing
        print(f"  Sent {len(pairs)} uplink words")
        print()

    # Collect telemetry for the specified duration
    print(f"Collecting telemetry for {args.duration} seconds...")
    print("-" * 60)

    start_time = time.time()
    last_snapshot_count = 0

    try:
        while time.time() - start_time < args.duration:
            time.sleep(0.5)

            # Check for new telemetry snapshots
            snapshots = decoder._completed_snapshots
            if len(snapshots) > last_snapshot_count:
                for snap in snapshots[last_snapshot_count:]:
                    list_type = snap.get("list_type_id", "?")
                    list_name = snap.get("list_name", "Unknown")
                    n_words = snap.get("word_count", 0)
                    print(f"  Telemetry snapshot: {list_name} "
                          f"(type {list_type}), {n_words} words")

                    # Show first few words
                    words = snap.get("words", [])
                    for i, val in enumerate(words[:5]):
                        print(f"    [{i:03d}] = {val:05o} ({val})")
                    if len(words) > 5:
                        print(f"    ... ({len(words) - 5} more words)")
                last_snapshot_count = len(snapshots)

    except KeyboardInterrupt:
        print()
        print("Interrupted.")

    print("-" * 60)
    print()
    print("Summary:")
    print(f"  Total packets received:  {packet_count}")
    print(f"  Telemetry words:         {telemetry_words}")
    print(f"  Telemetry snapshots:     {len(decoder._completed_snapshots)}")
    print(f"  Duration:                {time.time() - start_time:.1f} seconds")

    client.stop()
    print()
    print("Done.")


if __name__ == "__main__":
    main()