"""Admin CLI — runs inside the `app` container.

Usage from the host::

    docker compose exec app python -m app.cli grant-credit <email> <months>
    docker compose exec app python -m app.cli revoke-credit <email>
    docker compose exec app python -m app.cli show-status   <email>

`grant-credit` is idempotent: it extends `users.credit_until` from
``max(now, current_credit_until)``, so granting "1 month" twice gives
two months, not one (avoids accidental erosion of an existing grant
when re-running the command).

This is the manual lever for Phase D.2. In D.3 the Paddle webhook will
call the same helper for both sides of a referral conversion.
"""
from __future__ import annotations

import argparse
import asyncio
import sys
from datetime import datetime, timedelta, timezone

from sqlalchemy import select

from app.db import get_engine, get_session_factory
from app.models import User
from app.services.access import _aware, paid_status


def _utcnow() -> datetime:
    return datetime.now(timezone.utc)


async def _get_user_by_email(session, email: str) -> User | None:
    return (await session.execute(
        select(User).where(User.email == email)
    )).scalar_one_or_none()


async def grant_credit(email: str, months: float) -> int:
    if months <= 0:
        print(f"error: months must be positive (got {months})", file=sys.stderr)
        return 2
    factory = get_session_factory()
    async with factory() as session:
        user = await _get_user_by_email(session, email)
        if user is None:
            print(f"error: no user with email {email!r}", file=sys.stderr)
            return 1
        anchor = max(_utcnow(), _aware(user.credit_until) or _utcnow())
        # 30-day months — simple, predictable, no calendar arithmetic.
        days = int(round(months * 30))
        new_expiry = anchor + timedelta(days=days)
        user.credit_until = new_expiry
        await session.commit()
        # Refresh status snapshot from the just-committed value.
        st = paid_status(user)
        print(
            f"granted {months} month(s) to {email}: "
            f"credit_until={new_expiry.isoformat()} "
            f"(~{st.days_remaining} days remaining)"
        )
        return 0


async def revoke_credit(email: str) -> int:
    factory = get_session_factory()
    async with factory() as session:
        user = await _get_user_by_email(session, email)
        if user is None:
            print(f"error: no user with email {email!r}", file=sys.stderr)
            return 1
        user.credit_until = None
        await session.commit()
        print(f"revoked: credit_until cleared for {email}")
        return 0


async def show_status(email: str) -> int:
    factory = get_session_factory()
    async with factory() as session:
        user = await _get_user_by_email(session, email)
        if user is None:
            print(f"error: no user with email {email!r}", file=sys.stderr)
            return 1
        st = paid_status(user)
        print(f"email:        {user.email}")
        print(f"tier:         {user.tier}")
        print(f"credit_until: {user.credit_until or '—'}")
        print(f"paid active:  {st.active} (source={st.source or '—'})")
        if st.expires_at:
            print(f"expires in:   {st.days_remaining} days")
        return 0


async def send_test_digest(email: str, kind: str) -> int:
    """Generate a digest and send it to the named user immediately, ignoring
    opt-in state and idempotency. Useful for previewing copy in your own
    inbox before a real run lands."""
    import httpx

    from app.jobs._market_context import (
        REFERENCE_LINE,
        latest_quotes_by_group,
        recent_headlines_by_bucket,
    )
    from app.jobs.email_digest_job import _generate_variants, _send_one
    from app.services.openrouter import llm_configured

    if kind not in ("daily", "weekly"):
        print(f"error: kind must be 'daily' or 'weekly' (got {kind!r})",
              file=sys.stderr)
        return 2
    if not llm_configured():
        print("error: LLM provider not configured (set OPENROUTER_API_KEY)",
              file=sys.stderr)
        return 1

    factory = get_session_factory()
    async with factory() as session:
        user = await _get_user_by_email(session, email)
        if user is None:
            print(f"error: no user with email {email!r}", file=sys.stderr)
            return 1
        today = _utcnow()
        quotes = await latest_quotes_by_group(session)
        news = await recent_headlines_by_bucket(
            session, hours=(168 if kind == "weekly" else 24),
        )
        ctx = dict(today=today, quotes_by_group=quotes,
                   headlines_by_bucket=news, reference_line=REFERENCE_LINE)
        async with httpx.AsyncClient(follow_redirects=True) as client:
            variants = await _generate_variants(session, client, kind, ctx)
        tone = (user.digest_tone or "INTERMEDIATE").upper()
        content = (variants.get(tone)
                   or variants.get("INTERMEDIATE")
                   or next(iter(variants.values()), None))
        if content is None:
            print("error: all LLM variants failed", file=sys.stderr)
            return 1
        date_str = today.strftime("%Y-%m-%d")
        await _send_one(user, kind, content, date_str, session)
        print(f"sent {kind} digest to {email} (tone={tone})")
        return 0


def build_parser() -> argparse.ArgumentParser:
    p = argparse.ArgumentParser(prog="app.cli", description="Cassandra admin CLI")
    sub = p.add_subparsers(dest="cmd", required=True)

    g = sub.add_parser("grant-credit", help="Extend a user's paid-credit window")
    g.add_argument("email")
    g.add_argument("months", type=float)

    r = sub.add_parser("revoke-credit", help="Clear a user's credit_until")
    r.add_argument("email")

    s = sub.add_parser("show-status", help="Print paid-tier status for a user")
    s.add_argument("email")

    t = sub.add_parser("send-test-digest",
                       help="Send one digest immediately (bypasses opt-in/idempotency)")
    t.add_argument("email")
    t.add_argument("kind", choices=("daily", "weekly"))

    return p


async def _dispatch(args) -> int:
    """Run the chosen sub-command, then dispose the async engine cleanly
    so aiomysql's __del__ doesn't squawk at interpreter shutdown about a
    closed event loop."""
    try:
        if args.cmd == "grant-credit":
            return await grant_credit(args.email, args.months)
        if args.cmd == "revoke-credit":
            return await revoke_credit(args.email)
        if args.cmd == "show-status":
            return await show_status(args.email)
        if args.cmd == "send-test-digest":
            return await send_test_digest(args.email, args.kind)
        return 2
    finally:
        await get_engine().dispose()


def main(argv: list[str] | None = None) -> int:
    args = build_parser().parse_args(argv)
    return asyncio.run(_dispatch(args))


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