#!/usr/bin/env python3
"""
IWZ Ferienwohnungen - Deploy Script
Baut die Hugo-Seite und deployt sie per FTP zur Bunny.net Storage Zone.
"""

import ftplib
import os
import subprocess
import sys
import urllib.error
import urllib.parse
import urllib.request
from pathlib import Path

PROJECT_ROOT = Path(__file__).resolve().parent
PUBLIC_DIR = PROJECT_ROOT / "public"
FTP_PORT = 21


def load_env(path):
    env = {}
    if not path.exists():
        return env
    for line in path.read_text(encoding="utf-8").splitlines():
        line = line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        env[key.strip()] = value.strip()
    return env


def hugo_build():
    print("\n-> Hugo Build...")
    result = subprocess.run("hugo --gc --minify", shell=True)
    if result.returncode != 0:
        print("\nFEHLER: Hugo Build fehlgeschlagen!")
        sys.exit(1)


def ftp_upload_dir(ftp, local_dir, remote_dir=""):
    for entry in sorted(local_dir.iterdir()):
        remote_path = f"{remote_dir}/{entry.name}" if remote_dir else entry.name
        if entry.is_dir():
            try:
                ftp.mkd(remote_path)
            except ftplib.error_perm:
                pass  # existiert bereits
            ftp_upload_dir(ftp, entry, remote_path)
        else:
            with open(entry, "rb") as f:
                ftp.storbinary(f"STOR {remote_path}", f)
            print(f"  {remote_path}")


def deploy_to_bunny(host, zone, password):
    print(f"\n-> Deploy zu Bunny.net Storage Zone '{zone}'...")
    with ftplib.FTP() as ftp:
        ftp.connect(host, FTP_PORT)
        ftp.login(zone, password)
        ftp.set_pasv(True)
        ftp_upload_dir(ftp, PUBLIC_DIR)


def purge_cdn_cache(pull_zone_url, api_key):
    """Leert den Bunny CDN-Cache der Pull Zone per Wildcard-URL-Purge.

    Ohne Purge liefert das CDN unveraenderte Dateinamen (z.B. /css/style.css)
    weiter aus dem Cache -> online sieht man die alte Version.
    """
    if not pull_zone_url or not api_key:
        print("\n-> CDN-Purge uebersprungen "
              "(BUNNY_PULL_ZONE_URL / BUNNY_API_KEY nicht gesetzt).")
        print("   Cache ggf. manuell im Bunny-Dashboard leeren.")
        return

    wildcard = pull_zone_url.rstrip("/") + "/*"
    query = urllib.parse.urlencode({"url": wildcard, "async": "false"})
    url = f"https://api.bunny.net/purge?{query}"
    print(f"\n-> CDN-Cache leeren: {wildcard}")

    req = urllib.request.Request(url, method="POST")
    req.add_header("AccessKey", api_key)
    req.add_header("Accept", "application/json")
    try:
        with urllib.request.urlopen(req, timeout=60) as resp:
            if resp.status == 200:
                print("   Cache geleert.")
            else:
                print(f"   WARNUNG: unerwarteter Status {resp.status}")
    except urllib.error.HTTPError as e:
        print(f"   WARNUNG: Purge fehlgeschlagen (HTTP {e.code}). "
              "Ist BUNNY_API_KEY der Account-API-Key?")
    except urllib.error.URLError as e:
        print(f"   WARNUNG: Purge fehlgeschlagen ({e.reason}).")


if __name__ == "__main__":
    print("=== IWZ Deploy ===")

    env = {**load_env(PROJECT_ROOT / ".env"), **os.environ}
    zone = env.get("BUNNY_STORAGE_ZONE")
    host = env.get("BUNNY_STORAGE_HOST", "storage.bunnycdn.com")
    password = env.get("BUNNY_STORAGE_PASSWORD")
    pull_zone_url = env.get("BUNNY_PULL_ZONE_URL")
    api_key = env.get("BUNNY_API_KEY")

    if not zone or not password:
        print("\nFEHLER: BUNNY_STORAGE_ZONE / BUNNY_STORAGE_PASSWORD fehlen.")
        print("Siehe .env.example -> .env kopieren und befuellen.")
        sys.exit(1)

    hugo_build()
    deploy_to_bunny(host, zone, password)
    purge_cdn_cache(pull_zone_url, api_key)

    print("\nFertig! Seite ist live.")