#!/usr/bin/env python3
"""Wipe all PocketBase rows for one site.

Run BEFORE re-importing The Hills ext 12 from Buildsite for the year.

Destructive — requires explicit --yes flag. Backs up every row's full
record to /tmp before deletion so a mid-clear crash still leaves
something to inspect.

PB batch DELETE returns 404 on these collections, so this script
parallelizes single-record deletes via threads.

Usage:
    python3 scripts/clear-site-rows.py <site_id> --yes
"""
import json
import sys
import urllib.error
import urllib.request
from concurrent.futures import ThreadPoolExecutor, as_completed
from pathlib import Path

from pb_env import http, PB, superuser_token

if len(sys.argv) < 3 or sys.argv[2] != "--yes":
    sys.exit("REFUSING: pass --yes to confirm destructive wipe")

SITE_ID = sys.argv[1]
BACKUP_DIR = Path(f"/tmp/pb-clear-{SITE_ID}")
BACKUP_DIR.mkdir(exist_ok=True)

TOKEN = superuser_token()


def list_all(collection: str, site_filter: str) -> list[dict]:
    items: list[dict] = []
    page = 1
    while True:
        url = (
            f"/api/collections/{collection}/records"
            f"?filter={site_filter}&fields=*&perPage=500&page={page}"
        )
        code, body = http("GET", url, token=TOKEN)
        if code != 200:
            sys.exit(f"list {collection} page {page} failed: {code} {body}")
        page_items = body.get("items", [])
        items.extend(page_items)
        if len(page_items) < 500:
            break
        page += 1
    return items


def delete_one(collection: str, rid: str) -> tuple[str, int]:
    req = urllib.request.Request(
        f"{PB}/api/collections/{collection}/records/{rid}",
        method="DELETE",
        headers={"Authorization": TOKEN},
    )
    try:
        with urllib.request.urlopen(req) as r:
            return rid, r.status
    except urllib.error.HTTPError as e:
        return rid, e.code


def parallel_delete(collection: str, ids: list[str], workers: int = 16) -> tuple[int, list]:
    deleted = 0
    errors: list = []
    with ThreadPoolExecutor(max_workers=workers) as ex:
        futures = {ex.submit(delete_one, collection, rid): rid for rid in ids}
        for fut in as_completed(futures):
            rid, code = fut.result()
            if code == 204:
                deleted += 1
            else:
                errors.append({"id": rid, "code": code})
    return deleted, errors


def wipe(collection: str) -> None:
    filter_q = f"site='{SITE_ID}'"
    print(f"  listing {collection} for site {SITE_ID}...")
    rows = list_all(collection, filter_q)
    print(f"    found {len(rows)} rows")
    if not rows:
        return
    backup_path = BACKUP_DIR / f"{collection}.json"
    backup_path.write_text(json.dumps(rows, indent=2, default=str))
    print(f"    backed up to {backup_path}")
    ids = [r["id"] for r in rows]
    deleted, errors = parallel_delete(collection, ids)
    print(f"    deleted {deleted}/{len(ids)} rows")
    if errors:
        err_path = BACKUP_DIR / f"{collection}-delete-errors.json"
        err_path.write_text(json.dumps(errors, indent=2))
        print(f"    ERRORS written to {err_path}")
        sys.exit(1)


print(f"=== CLEAR SITE {SITE_ID} ===")
print(f"backup dir: {BACKUP_DIR}")

# fuel_logs reference vehicles — delete children first.
wipe("fuel_logs")
wipe("vehicles")

print("=== verifying ===")
for coll in ("fuel_logs", "vehicles"):
    code, body = http(
        "GET",
        f"/api/collections/{coll}/records?filter=site='{SITE_ID}'&fields=id&perPage=1",
        token=TOKEN,
    )
    if code != 200:
        sys.exit(f"verify {coll} failed: {code} {body}")
    remaining = body.get("totalItems", 0)
    print(f"  {coll}: {remaining} remaining")
    if remaining != 0:
        sys.exit(f"!! {coll} still has {remaining} rows for site {SITE_ID}")

print("=== DONE ===")