import os
import subprocess
from datetime import datetime, timedelta

from fastapi import FastAPI
from apscheduler.schedulers.background import BackgroundScheduler
import uvicorn

app = FastAPI()
scheduler = BackgroundScheduler()

# Configuration from Environment Variables
INTERVAL_HOURS = int(os.getenv("BUILD_INTERVAL", 6))
HF_TOKEN = os.getenv("HF_TOKEN", None)
HOST_REPO = "lainlives/bldr"

# State tracking
status_info = {
    "last_run": None,
    "next_run": datetime.now(),
    "is_running": False
}


def run_builds():
    """The core build logic."""
    status_info["is_running"] = True
    print(f"[{datetime.now()}] Starting build sequence...")

    scripts = ["llama.py", "wheelmaker.py"]

    try:
        for script in scripts:
            # check=True will raise an error if the script fails
            subprocess.run(["python", script], check=True)
    except subprocess.CalledProcessError as e:
        print(f"Build failed at {script}: {e}")
    finally:
        status_info["last_run"] = datetime.now()
        status_info["next_run"] = datetime.now() + timedelta(hours=INTERVAL_HOURS)
        status_info["is_running"] = False
        print(f"[{datetime.now()}] Sequence finished. Next run: {status_info['next_run']}")


@app.get("/")
def get_status():
    """Human-readable status and countdown."""
    now = datetime.now()
    time_remaining = status_info["next_run"] - now

    return {
        "status": "Busy" if status_info["is_running"] else "Idle",
        "interval_configured": f"{INTERVAL_HOURS}h",
        "last_run": status_info["last_run"],
        "next_run": status_info["next_run"],
        "countdown": str(time_remaining).split(".")[0] if time_remaining.total_seconds() > 0 else "Pending..."
    }


@app.post("/force")
def force_build():
    """Manually trigger the build sequence via API."""
    if status_info["is_running"]:
        return {"message": "Build already in progress."}, 409

    # This tells the scheduler to run the job 'build_job' immediately
    scheduler.get_job('build_job').modify(next_run_time=datetime.now())
    return {"message": "Manual build triggered successfully."}


@app.get("/next")
def get_next_raw():
    """Clean endpoint for programmatic access."""
    return {"next_run_iso": status_info["next_run"].isoformat()}


print(f"Starting {HOST_REPO}")
if __name__ == "__main__":
    # Schedule the job and give it an ID so we can 'force' it later
    scheduler.add_job(
        run_builds,
        'interval',
        hours=INTERVAL_HOURS,
        next_run_time=datetime.now(),
        id='build_job'
    )
    scheduler.start()

    uvicorn.run(app, host="0.0.0.0", port=7860)