"""Integration tests for the seat_enforcement service.

Uses the test_db fixture (real async DB, fresh schema per test) to exercise
the SQL counting logic in check_seat_available / get_seat_usage.
"""

import uuid

import pytest
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.account import Account
from app.models.subscription import Subscription
from app.models.user import User
from app.services.seat_enforcement import check_seat_available, get_seat_usage


# ---------------------------------------------------------------------------
# Test-local DB helpers
# ---------------------------------------------------------------------------

async def _make_account(db: AsyncSession, *, suffix: str | None = None) -> Account:
    """Create and flush a minimal Account row."""
    s = suffix or str(uuid.uuid4())[:8]
    account = Account(
        id=uuid.uuid4(),
        name=f"Test Account {s}",
        display_code=s[:8],
    )
    db.add(account)
    await db.flush()
    return account


async def _make_subscription(
    db: AsyncSession,
    account: Account,
    *,
    seat_limit: int | None = None,
    l1_seat_limit: int | None = None,
) -> Subscription:
    """Create and flush a Subscription for the given account."""
    sub = Subscription(
        account_id=account.id,
        plan="pro",
        status="active",
        seat_limit=seat_limit,
        l1_seat_limit=l1_seat_limit,
    )
    db.add(sub)
    await db.flush()
    return sub


async def _make_user(
    db: AsyncSession,
    account: Account,
    *,
    account_role: str = "engineer",
    is_active: bool = True,
    suffix: str | None = None,
) -> User:
    """Create and flush a User row in the given account."""
    s = suffix or str(uuid.uuid4())[:8]
    user = User(
        id=uuid.uuid4(),
        email=f"user-{s}@example.com",
        name=f"User {s}",
        account_id=account.id,
        account_role=account_role,
        role="engineer",
        is_active=is_active,
    )
    db.add(user)
    await db.flush()
    return user


# ---------------------------------------------------------------------------
# Tests
# ---------------------------------------------------------------------------

@pytest.mark.asyncio
async def test_engineer_seat_available_when_under_limit(test_db: AsyncSession):
    """check_seat_available returns available=True when current < seat_limit."""
    account = await _make_account(test_db)
    sub = await _make_subscription(test_db, account, seat_limit=5)

    for _ in range(3):
        await _make_user(test_db, account, account_role="engineer")

    result = await check_seat_available(account, sub, "engineer", test_db)

    assert result.available is True
    assert result.current == 3
    assert result.limit == 5
    assert result.role == "engineer"


@pytest.mark.asyncio
async def test_engineer_seat_unavailable_when_at_limit(test_db: AsyncSession):
    """check_seat_available returns available=False when current == seat_limit."""
    account = await _make_account(test_db)
    sub = await _make_subscription(test_db, account, seat_limit=2)

    for _ in range(2):
        await _make_user(test_db, account, account_role="engineer")

    result = await check_seat_available(account, sub, "engineer", test_db)

    assert result.available is False
    assert result.current == 2
    assert result.limit == 2


@pytest.mark.asyncio
async def test_l1_uses_separate_seat_limit(test_db: AsyncSession):
    """Engineer limit hit does not affect l1_tech availability."""
    account = await _make_account(test_db)
    # seat_limit exhausted, l1_seat_limit still has room
    sub = await _make_subscription(test_db, account, seat_limit=2, l1_seat_limit=3)

    # Fill engineer seats to the limit
    for _ in range(2):
        await _make_user(test_db, account, account_role="engineer")

    # Add one L1 user (below limit)
    await _make_user(test_db, account, account_role="l1_tech")

    eng_result = await check_seat_available(account, sub, "engineer", test_db)
    l1_result = await check_seat_available(account, sub, "l1_tech", test_db)

    assert eng_result.available is False, "engineer seats should be full"
    assert eng_result.current == 2

    assert l1_result.available is True, "l1_tech seats should still be available"
    assert l1_result.current == 1
    assert l1_result.limit == 3


@pytest.mark.asyncio
async def test_unlimited_seat_limit_is_always_available(test_db: AsyncSession):
    """seat_limit=None means unlimited; available=True regardless of count."""
    account = await _make_account(test_db)
    sub = await _make_subscription(test_db, account, seat_limit=None)

    # Add many engineer users
    for _ in range(10):
        await _make_user(test_db, account, account_role="engineer")

    result = await check_seat_available(account, sub, "engineer", test_db)

    assert result.available is True
    assert result.current == 10
    assert result.limit is None


@pytest.mark.asyncio
async def test_get_seat_usage_returns_engineer_l1_tuple(test_db: AsyncSession):
    """get_seat_usage returns a (engineer, l1_tech) tuple in the correct order."""
    account = await _make_account(test_db)
    sub = await _make_subscription(test_db, account, seat_limit=5, l1_seat_limit=3)

    await _make_user(test_db, account, account_role="engineer")
    await _make_user(test_db, account, account_role="l1_tech")
    await _make_user(test_db, account, account_role="l1_tech")

    eng, l1 = await get_seat_usage(account, sub, test_db)

    assert eng.role == "engineer"
    assert eng.current == 1
    assert eng.limit == 5
    assert eng.available is True

    assert l1.role == "l1_tech"
    assert l1.current == 2
    assert l1.limit == 3
    assert l1.available is True


@pytest.mark.asyncio
async def test_inactive_users_not_counted(test_db: AsyncSession):
    """Inactive (is_active=False) users are excluded from the seat count."""
    account = await _make_account(test_db)
    sub = await _make_subscription(test_db, account, seat_limit=3)

    # 1 active, 2 inactive
    await _make_user(test_db, account, account_role="engineer", is_active=True)
    await _make_user(test_db, account, account_role="engineer", is_active=False)
    await _make_user(test_db, account, account_role="engineer", is_active=False)

    result = await check_seat_available(account, sub, "engineer", test_db)

    assert result.current == 1
    assert result.available is True