"""
backfill_booking_statuses.py
────────────────────────────
One-time script to fix all existing bookings whose status should have
automatically advanced but didn't because the transition job didn't exist yet.

Rules applied
─────────────
  CONFIRMED  →  ACTIVE_STAY   check-in passed but checkout has NOT yet passed
  CONFIRMED  →  COMPLETED     both check-in AND checkout have passed
  ACTIVE_STAY →  COMPLETED    checkout has passed

Run from the AIDA project root:
    python scripts/backfill_booking_statuses.py

Set MONGO_URI environment variable (or edit the fallback below) before running.
"""

import asyncio
import os
from datetime import datetime

from motor.motor_asyncio import AsyncIOMotorClient

MONGO_URI = os.getenv("MONGO_URI", "mongodb://localhost:27017")
DB_NAME   = os.getenv("MONGO_DB_NAME", "lojiz")

STATUS_CONFIRMED   = "Confirmed"
STATUS_ACTIVE_STAY = "ActiveStay"
STATUS_COMPLETED   = "Completed"


def _parse_dt(booking: dict, date_field: str, time_field: str, default_hour: int) -> datetime:
    raw = booking.get(date_field)
    if isinstance(raw, datetime):
        base = raw.replace(hour=0, minute=0, second=0, microsecond=0)
    elif isinstance(raw, str):
        try:
            base = datetime.fromisoformat(raw[:10])
        except ValueError:
            return datetime.max
    else:
        return datetime.max

    time_str = booking.get(time_field)
    if time_str:
        try:
            h, m = (int(x) for x in time_str.strip().split(":"))
            return base.replace(hour=h, minute=m)
        except Exception:
            pass
    return base.replace(hour=default_hour, minute=0)


async def run():
    client = AsyncIOMotorClient(MONGO_URI)
    db     = client[DB_NAME]
    now    = datetime.utcnow()

    counts = {"confirmed_to_active": 0, "confirmed_to_completed": 0, "active_to_completed": 0, "skipped": 0}

    print(f"[{now.isoformat()}] Starting backfill — connecting to {DB_NAME}...")

    # ── Pass 1: Fix CONFIRMED bookings ───────────────────────────────────────
    confirmed = await db["bookings"].find({"status": STATUS_CONFIRMED}).to_list(length=None)
    print(f"  Found {len(confirmed)} CONFIRMED bookings to evaluate.")

    for b in confirmed:
        checkin_dt  = _parse_dt(b, "check_in_date",  "estimated_arrival_time",   default_hour=14)
        checkout_dt = _parse_dt(b, "check_out_date", "estimated_departure_time", default_hour=11)

        if now < checkin_dt:
            counts["skipped"] += 1
            continue

        if now >= checkout_dt:
            new_status = STATUS_COMPLETED
            counts["confirmed_to_completed"] += 1
        else:
            new_status = STATUS_ACTIVE_STAY
            counts["confirmed_to_active"] += 1

        await db["bookings"].update_one(
            {"_id": b["_id"]},
            {"$set": {"status": new_status, "updated_at": now}},
        )
        print(f"  Booking {b['_id']}: CONFIRMED → {new_status}  "
              f"(check_in={checkin_dt.isoformat()}, check_out={checkout_dt.isoformat()})")

    # ── Pass 2: Fix ACTIVE_STAY bookings ─────────────────────────────────────
    active = await db["bookings"].find({"status": STATUS_ACTIVE_STAY}).to_list(length=None)
    print(f"  Found {len(active)} ACTIVE_STAY bookings to evaluate.")

    for b in active:
        checkout_dt = _parse_dt(b, "check_out_date", "estimated_departure_time", default_hour=11)

        if now >= checkout_dt:
            await db["bookings"].update_one(
                {"_id": b["_id"]},
                {"$set": {"status": STATUS_COMPLETED, "updated_at": now}},
            )
            counts["active_to_completed"] += 1
            print(f"  Booking {b['_id']}: ACTIVE_STAY → COMPLETED  "
                  f"(check_out={checkout_dt.isoformat()})")
        else:
            counts["skipped"] += 1

    # ── Summary ───────────────────────────────────────────────────────────────
    print("\n── Backfill complete ──────────────────────────────────────────")
    print(f"  CONFIRMED  → ACTIVE_STAY : {counts['confirmed_to_active']}")
    print(f"  CONFIRMED  → COMPLETED   : {counts['confirmed_to_completed']}")
    print(f"  ACTIVE_STAY → COMPLETED  : {counts['active_to_completed']}")
    print(f"  Skipped (not yet due)    : {counts['skipped']}")
    total = counts["confirmed_to_active"] + counts["confirmed_to_completed"] + counts["active_to_completed"]
    print(f"  Total updated            : {total}")
    print("───────────────────────────────────────────────────────────────")

    client.close()


if __name__ == "__main__":
    asyncio.run(run())