#!/usr/bin/env python3
"""AudioPen webhook receiver.

Listens for POST requests at /audiopen/<shared-secret> and writes the polished-prose
payload to COUNCIL_INBOX_RAW as a bare markdown file. A separate cron/systemd job
(or inotify) then runs audiopen-ingest.sh to normalise into the PKB inbox.

Zero external dependencies (stdlib only). Designed to sit behind Tailscale Funnel
or similar outbound-initiated tunnel — binds to 127.0.0.1 by default.

Environment:
    AUDIOPEN_WEBHOOK_SECRET   required. Shared secret in the URL path.
    AUDIOPEN_WEBHOOK_HOST     default 127.0.0.1
    AUDIOPEN_WEBHOOK_PORT     default 8765
    COUNCIL_INBOX_RAW         default /var/mnt/data/projects/council/inbox/raw

AudioPen's webhook payload shape varies by version; we accept any of these JSON keys
for the body: `body`, `output`, `summary`, `polished`. For the title: `title`,
`name`. Unknown fields are ignored. The raw payload is kept in an HTTP access log
on stderr so you can inspect it if AudioPen changes shape.
"""

from __future__ import annotations
import datetime as _dt
import json
import os
import pathlib
import re
import sys
from http.server import BaseHTTPRequestHandler, HTTPServer


INBOX_RAW = pathlib.Path(
    os.environ.get("COUNCIL_INBOX_RAW", "/var/mnt/data/projects/council/inbox/raw")
)
SECRET = os.environ.get("AUDIOPEN_WEBHOOK_SECRET")
HOST = os.environ.get("AUDIOPEN_WEBHOOK_HOST", "127.0.0.1")
PORT = int(os.environ.get("AUDIOPEN_WEBHOOK_PORT", "8765"))

_SLUG_RE = re.compile(r"[^a-z0-9]+")


def slugify(text: str, max_len: int = 60) -> str:
    s = _SLUG_RE.sub("-", text.strip().lower()).strip("-")
    return (s or "untitled")[:max_len]


def extract_content(payload: dict) -> tuple[str, str]:
    title = str(
        payload.get("title")
        or payload.get("name")
        or ""
    ).strip()
    body = str(
        payload.get("body")
        or payload.get("output")
        or payload.get("summary")
        or payload.get("polished")
        or payload.get("orig_transcript")
        or ""
    ).strip()
    if not title and body:
        title = body.splitlines()[0][:60]
    return title or "Untitled", body


class Handler(BaseHTTPRequestHandler):
    server_version = "audiopen-webhook/1"

    def _reply(self, status: int, msg: str = "") -> None:
        self.send_response(status)
        self.send_header("Content-Type", "text/plain; charset=utf-8")
        self.send_header("Content-Length", str(len(msg)))
        self.end_headers()
        if msg:
            self.wfile.write(msg.encode())

    def do_POST(self) -> None:
        parts = [p for p in self.path.split("/") if p]
        if len(parts) < 2 or parts[0] != "audiopen" or parts[1] != SECRET:
            self._reply(404, "not found")
            return

        length = int(self.headers.get("Content-Length", "0") or 0)
        raw = self.rfile.read(length) if length > 0 else b""
        try:
            payload = json.loads(raw) if raw else {}
        except json.JSONDecodeError:
            self._reply(400, "invalid JSON")
            return
        if not isinstance(payload, dict):
            self._reply(400, "expected JSON object")
            return

        title, body = extract_content(payload)
        if not body:
            self._reply(400, "empty body")
            return

        slug = slugify(title)
        ts = _dt.datetime.now().strftime("%Y-%m-%d-%H%M")
        filename = f"{ts}_{slug}.md"

        INBOX_RAW.mkdir(parents=True, exist_ok=True)
        target = INBOX_RAW / filename
        # Avoid overwriting on same-minute collision
        suffix = 2
        while target.exists():
            target = INBOX_RAW / f"{ts}_{slug}_{suffix}.md"
            suffix += 1

        target.write_text(f"# {title}\n\n{body}\n", encoding="utf-8")
        sys.stderr.write(f"[audiopen-webhook] wrote {target}\n")
        self._reply(200, "ok\n")

    def do_GET(self) -> None:
        # Health check at /health; everything else returns 404.
        if self.path == "/health":
            self._reply(200, "ok\n")
        else:
            self._reply(404, "not found")

    def log_message(self, fmt: str, *args) -> None:
        sys.stderr.write(f"[audiopen-webhook] {self.address_string()} {fmt % args}\n")


def main() -> int:
    if not SECRET:
        sys.stderr.write("AUDIOPEN_WEBHOOK_SECRET env var is required.\n")
        return 1
    sys.stderr.write(
        f"[audiopen-webhook] listening on http://{HOST}:{PORT}, inbox_raw={INBOX_RAW}\n"
    )
    HTTPServer((HOST, PORT), Handler).serve_forever()
    return 0


if __name__ == "__main__":
    sys.exit(main())