import json
import random
from pathlib import Path

from fastapi import FastAPI, Query
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import PlainTextResponse

app = FastAPI(title="马列毛一言 API")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["GET"],
    allow_headers=["*"],
)

DATA_PATH = Path(__file__).parent / "data.json"
try:
    with open(DATA_PATH, encoding="utf-8") as f:
        DATA = json.load(f)
except FileNotFoundError:
    DATA = []

BY_ID = {str(item["id"]): item for item in DATA}
VALID_CATS = {"mx", "e", "l", "s", "mz"}


def format_quote(item: dict) -> str:
    return f'{item["Hitokoto"]}\n{item["source"]}'


@app.get("/", response_class=PlainTextResponse)
def hitokoto(
    c: list[str] = Query(default=[]),
    id: str | None = Query(default=None),
):
    # id 优先
    if id is not None:
        item = BY_ID.get(str(id))
        if item is None:
            return PlainTextResponse("未找到该 id 的语录", status_code=404)
        return format_quote(item)

    # 同时支持 ?c=mx&c=e 和 ?c=mx,e
    cats: list[str] = []
    for entry in c:
        cats.extend(p.strip() for p in entry.split(",") if p.strip())

    if not cats:
        pool = DATA
    else:
        wanted = set(cats)
        pool = [item for item in DATA if wanted & set(item["cat"])]

    if not pool:
        return PlainTextResponse("没有符合条件的语录", status_code=404)

    return format_quote(random.choice(pool))