import os
from fastapi import FastAPI, Form
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import PlainTextResponse
import pathlib

app = FastAPI()

# 允许所有来源跨域访问（本地 HTML 调用时需要）
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

DATA_DIR = pathlib.Path("/data")
DATA_DIR.mkdir(exist_ok=True)

@app.get("/api/read/{page_name}", response_class=PlainTextResponse)
async def read_page(page_name: str):
    """读取页面纯文本，不存在则返回空字符串"""
    file_path = DATA_DIR / f"{page_name}.txt"
    if file_path.exists():
        return file_path.read_text(encoding="utf-8")
    return ""

@app.post("/api/write/{page_name}")
async def write_page(page_name: str, t: str = Form(...)):
    """写入页面内容，表单参数 t"""
    file_path = DATA_DIR / f"{page_name}.txt"
    file_path.write_text(t, encoding="utf-8")
    return {"ok": True}