import asyncio
import json
import logging

from fastapi import BackgroundTasks, FastAPI, HTTPException, Request
from fastapi.responses import HTMLResponse, StreamingResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from pydantic import BaseModel

from arte_api import fetch_concerts, invalidate_cache, CATEGORIES
from downloader import DownloadManager

logging.basicConfig(level=logging.INFO)

app = FastAPI(title="Arte-dl")
app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates")

dm = DownloadManager()


# ------------------------------------------------------------------ pages


@app.get("/", response_class=HTMLResponse)
async def index(request: Request):
    return templates.TemplateResponse("index.html", {"request": request})


# ------------------------------------------------------------------ API: concerts


@app.get("/api/categories")
async def api_categories():
    return CATEGORIES


@app.get("/api/concerts")
async def api_concerts(page: int = 1, search: str = "", page_size: int = 24, category: str = ""):
    return await fetch_concerts(page=page, search=search, page_size=page_size, category=category)


@app.post("/api/refresh")
async def api_refresh():
    count = await invalidate_cache()
    return {"count": count}


# ------------------------------------------------------------------ API: downloads


class DownloadRequest(BaseModel):
    url: str
    title: str
    subtitle: str = ""
    year: int | None = None
    category: str = ""


@app.post("/api/download")
async def api_download(req: DownloadRequest, bg: BackgroundTasks):
    if not req.url:
        raise HTTPException(status_code=400, detail="url required")
    dl_id = dm.enqueue(req.url, req.title, req.subtitle, req.year, req.category, bg)
    return {"id": dl_id}


@app.get("/api/downloads")
async def api_downloads():
    return dm.history()


@app.get("/api/progress/{dl_id}")
async def api_progress(dl_id: str):
    async def stream():
        while True:
            s = dm.status(dl_id)
            yield f"data: {json.dumps(s)}\n\n"
            if s.get("state") in ("done", "error", "unknown"):
                break
            await asyncio.sleep(0.8)

    return StreamingResponse(stream(), media_type="text/event-stream")