import os
import time
import socket
from fastapi import FastAPI, HTTPException, Query
from pydantic import BaseModel

from .serial_bridge import SerialBridge, SerialConfig, hex2b
from .mock_bridge import MockBridge

TRAME_ESCLAVE = b"\x01\x0D\x0A"
TRAME_DSD = b"\x01\x10\x39\x39\x4D\x0D\x0A"

def env(name: str, default: str) -> str:
    return os.getenv(name, default)

APP_MODE = env("APP_MODE", "mock").strip().lower()

app = FastAPI(title="Pont bascule API", version="1.2")

if APP_MODE == "serial":
    cfg = SerialConfig(
        port=env("SERIAL_PORT", "/dev/ttyUSB0"),
        baudrate=int(env("SERIAL_BAUDRATE", "9600")),
    )
    bridge = SerialBridge(cfg)
else:
    cfg = None
    bridge = MockBridge()

class CustomReq(BaseModel):
    hex: str

class EchoReq(BaseModel):
    msg: str

@app.get("/health")
def health():
    return {
        "ok": True,
        "mode": APP_MODE,
        "busy": bridge.busy(),
        "hostname": socket.gethostname(),
        "timestamp": time.time(),
    }

@app.get("/test/ping")
def test_ping():
    return {"pong": True}

@app.post("/test/echo")
def test_echo(req: EchoReq):
    return {"echo": req.msg}

@app.post("/send/esclave")
def send_esclave():
    res = bridge.send_and_read_once(TRAME_ESCLAVE)
    if res.get("busy"):
        raise HTTPException(status_code=409, detail=res["error"])
    return res