from fastapi import FastAPI, HTTPException
from fastapi.responses import HTMLResponse, RedirectResponse
from core import hardware

app = FastAPI()


@app.on_event("startup")
def startup():
    hardware.init()


def load_template(name, replacements):
    try:
        with open(f"html/{name}", "r") as f:
            html = f.read()
    except FileNotFoundError:
        raise HTTPException(status_code=500, detail="Template nicht gefunden")

    for key, value in replacements.items():
        html = html.replace(key, str(value))

    return html

@app.get("/led", response_class=HTMLResponse)
def led_page():
    r, y, g = hardware.status()

    return HTMLResponse(
        load_template("led.html", {
            "{{R}}": r,
            "{{Y}}": y,
            "{{G}}": g,
            "{{R_ON}}": "on" if r == 1 else "",
            "{{Y_ON}}": "on" if y == 1 else "",
            "{{G_ON}}": "on" if g == 1 else "",
        })
    )

@app.get("/led/{color}/{value}")
def set_led(color: str, value: int):

    if value not in (0, 1):
        raise HTTPException(status_code=400)

    if color == "r":
        hardware.setRedLED(value)
    elif color == "y":
        hardware.setYellowLED(value)
    elif color == "g":
        hardware.setGreenLED(value)
    else:
        raise HTTPException(status_code=400)

    return RedirectResponse(url="/led", status_code=303)


@app.get("/temp", response_class=HTMLResponse)
def temp_page():
    t = hardware.get_temperature()

    if t is None:
        value = "Sensorfehler"
    else:
        value = f"{t:.2f}"

    return HTMLResponse(
        load_template("temp.html", {
            "{{T}}": value
        })
    )