import os
from pathlib import Path

import httpx
from fastapi import APIRouter, Request
from fastapi.responses import HTMLResponse, Response

router = APIRouter()

_API_URL = os.getenv("API_URL", "http://api:8000")
_DIST = Path(__file__).parent / "editor-ui" / "dist"

_SKIP_REQ = {"host", "content-length", "transfer-encoding"}
_SKIP_RES = {"content-encoding", "transfer-encoding", "content-length"}


# ── API proxy: browser → Flet server → internal API ──────────────────────────

@router.api_route("/api/{path:path}", methods=["GET", "POST", "PUT", "DELETE", "PATCH"])
async def api_proxy(path: str, request: Request):
    headers = {k: v for k, v in request.headers.items() if k.lower() not in _SKIP_REQ}
    body = await request.body()
    async with httpx.AsyncClient(timeout=60.0) as client:
        r = await client.request(
            method=request.method,
            url=f"{_API_URL}/{path}",
            headers=headers,
            content=body,
            params=dict(request.query_params),
        )
    res_headers = {k: v for k, v in r.headers.items() if k.lower() not in _SKIP_RES}
    return Response(
        content=r.content,
        status_code=r.status_code,
        headers=res_headers,
        media_type=r.headers.get("content-type"),
    )


# ── React editor SPA ──────────────────────────────────────────────────────────

@router.get("/editor/{article_id}")
async def editor_page(article_id: str):
    index = _DIST / "index.html"
    if not index.exists():
        return HTMLResponse(
            "<h2>Editor not built.</h2><p>Run <code>docker-compose up --build</code></p>",
            status_code=503,
        )
    return HTMLResponse(index.read_text(encoding="utf-8"))