import os
import tempfile
from typing import Optional

import requests
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, Field

ROBOT_IP = os.getenv("ROBOT_IP", "127.0.0.1")
ROBOT_PORT = int(os.getenv("ROBOT_PORT", "31950"))
OT_API_VERSION = os.getenv("OT_API_VERSION", "3")
TIMEOUT_SEC = float(os.getenv("HTTP_TIMEOUT", "30"))

app = FastAPI(title="Opentrons Protocol Analyzer API")

class AnalyzeRequest(BaseModel):
    protocol_text: str = Field(..., description="Python protocol source code")
    filename: str = Field("protocol.py", description="Filename to send to robot-server")

class AnalyzeResponse(BaseModel):
    ok: bool
    status_code: int
    data: Optional[dict] = None
    error: Optional[dict] = None

def _post_protocol_file(filepath: str, filename: str) -> requests.Response:
    endpoint = f"http://{ROBOT_IP}:{ROBOT_PORT}/protocols"
    headers = {"Opentrons-Version": OT_API_VERSION}
    with open(filepath, "rb") as f:
        files = {"files": (filename, f, "text/x-python")}
        return requests.post(endpoint, headers=headers, files=files, timeout=TIMEOUT_SEC)

@app.get("/health")
def health():
    # FastAPIの生存確認（robot-serverの生存確認は別endpointに分ける）
    return {"ok": True}

@app.get("/robot/health")
def robot_health():
    # robot-serverが上がってるか軽く確認
    try:
        r = requests.get(f"http://{ROBOT_IP}:{ROBOT_PORT}/health", timeout=5)
        return {"ok": r.ok, "status_code": r.status_code, "text": r.text[:2000]}
    except requests.RequestException as e:
        raise HTTPException(status_code=503, detail=f"robot-server unreachable: {e}")

@app.post("/analyze", response_model=AnalyzeResponse)
def analyze(req: AnalyzeRequest):
    text = (req.protocol_text or "").strip()
    if not text:
        raise HTTPException(status_code=400, detail="protocol_text is empty")

    fd, path = tempfile.mkstemp(prefix="protocol_", suffix=".py")
    try:
        with os.fdopen(fd, "w", encoding="utf-8") as f:
            f.write(text)

        try:
            resp = _post_protocol_file(path, req.filename)
        except requests.RequestException as e:
            raise HTTPException(status_code=503, detail=f"robot-server request failed: {e}")

        # robot-serverはJSONを返す想定
        try:
            payload = resp.json()
        except ValueError:
            # JSONじゃなければそのまま返す
            raise HTTPException(status_code=502, detail=f"non-json from robot-server: {resp.text[:2000]}")

        if resp.status_code >= 400:
            return AnalyzeResponse(ok=False, status_code=resp.status_code, error=payload)

        return AnalyzeResponse(ok=True, status_code=resp.status_code, data=payload)

    finally:
        try:
            os.remove(path)
        except OSError:
            pass