"""
scripts/mock_iot_sender.py
───────────────────────────
CLI script that simulates an IoT device sending PPG signals to the API.

Usage:
    python scripts/mock_iot_sender.py
    python scripts/mock_iot_sender.py --url http://localhost:7860 --count 5
    python scripts/mock_iot_sender.py --user patient-42 --rate 250

Useful for:
  • Local testing without a real IoT sensor
  • Load testing the ingest endpoint
  • Seeding the message queue for consumer testing
"""
from __future__ import annotations

import argparse
import asyncio
import math
import random
import time
import uuid
from typing import Optional

import httpx


def generate_ppg_signal(
    sampling_rate: float = 125.0,
    duration_seconds: float = 10.0,
    heart_rate_bpm: float = 70.0,
    noise_level: float = 0.05,
) -> list[float]:
    """
    Generate a synthetic PPG waveform (sinusoidal approximation).

    Args:
        sampling_rate:    Samples per second (Hz).
        duration_seconds: Signal duration in seconds.
        heart_rate_bpm:   Simulated heart rate (beats per minute).
        noise_level:      Gaussian noise standard deviation.

    Returns:
        List of float PPG amplitude values.
    """
    n_samples = int(sampling_rate * duration_seconds)
    heart_rate_hz = heart_rate_bpm / 60.0

    values = []
    for i in range(n_samples):
        t = i / sampling_rate
        # Main pulsatile component (fundamental frequency)
        fundamental = math.sin(2 * math.pi * heart_rate_hz * t)
        # Second harmonic (dicrotic notch approximation)
        harmonic = 0.3 * math.sin(2 * math.pi * 2 * heart_rate_hz * t - 0.5)
        # Gaussian noise
        noise = random.gauss(0, noise_level)
        ppg = fundamental + harmonic + noise
        values.append(round(ppg, 6))

    return values


async def send_ppg(
    client: httpx.AsyncClient,
    url: str,
    device_id: str,
    user_id: str,
    sampling_rate: float,
    duration: float,
    index: int,
) -> None:
    """Send one PPG signal to the ingest endpoint."""
    hr = random.uniform(60, 100)
    ppg_values = generate_ppg_signal(
        sampling_rate=sampling_rate,
        duration_seconds=duration,
        heart_rate_bpm=hr,
    )

    payload = {
        "device_id": device_id,
        "user_id": user_id,
        "sampling_rate": sampling_rate,
        "ppg_values": ppg_values,
        "duration_seconds": duration,
    }

    start = time.perf_counter()
    try:
        response = await client.post(f"{url}/api/v1/ppg/ingest", json=payload, timeout=30.0)
        elapsed = (time.perf_counter() - start) * 1000
        if response.status_code == 201:
            data = response.json()
            print(
                f"[{index:3d}] ✅ signal_id={data['signal_id'][:8]}… "
                f"samples={data['num_samples']} queued={data['queued']} "
                f"({elapsed:.0f}ms)"
            )
        else:
            print(f"[{index:3d}] ❌ HTTP {response.status_code}: {response.text[:100]}")
    except Exception as exc:
        print(f"[{index:3d}] 💥 Error: {exc}")


async def main(
    url: str,
    count: int,
    user_id: str,
    device_id: str,
    rate: float,
    duration: float,
    interval: float,
) -> None:
    """Send `count` PPG signals with optional interval between each."""
    print(f"🩺 Mock IoT Sender")
    print(f"   Target : {url}")
    print(f"   User   : {user_id}")
    print(f"   Device : {device_id}")
    print(f"   Count  : {count}")
    print(f"   Rate   : {rate} Hz")
    print(f"   Duration: {duration}s")
    print(f"   Interval: {interval}s")
    print("-" * 60)

    async with httpx.AsyncClient() as client:
        for i in range(1, count + 1):
            await send_ppg(client, url, device_id, user_id, rate, duration, i)
            if i < count and interval > 0:
                await asyncio.sleep(interval)

    print("-" * 60)
    print(f"✅ Done — sent {count} signals.")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Mock IoT PPG Signal Sender")
    parser.add_argument("--url", default="http://localhost:7860", help="API base URL")
    parser.add_argument("--count", type=int, default=5, help="Number of signals to send")
    parser.add_argument("--user", default=f"user-{uuid.uuid4().hex[:6]}", help="User ID")
    parser.add_argument("--device", default="mock-sensor-001", help="Device ID")
    parser.add_argument("--rate", type=float, default=125.0, help="Sampling rate (Hz)")
    parser.add_argument("--duration", type=float, default=10.0, help="Signal duration (seconds)")
    parser.add_argument("--interval", type=float, default=1.0, help="Seconds between signals")
    args = parser.parse_args()

    asyncio.run(
        main(
            url=args.url,
            count=args.count,
            user_id=args.user,
            device_id=args.device,
            rate=args.rate,
            duration=args.duration,
            interval=args.interval,
        )
    )