"""Lazy-refresh behaviour of /networth against the wealthfolio_sync mirror.

The /networth, /networth/history, and /scenarios/{id}/progress endpoints
read from `account_snapshot`. When that cache is older than
`NETWORTH_CACHE_TTL_DAYS` (default 1) and a wf_sync session is available,
they refresh it from the live mirror before returning. These tests pin
that contract.
"""
from __future__ import annotations

from collections.abc import AsyncIterator
from datetime import date, timedelta
from decimal import Decimal

import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from sqlalchemy import select, text
from sqlalchemy.ext.asyncio import (
    AsyncEngine,
    AsyncSession,
    async_sessionmaker,
    create_async_engine,
)

from fire_planner.api.dependencies import get_session, get_wf_sync_session
from fire_planner.app import app
from fire_planner.db import AccountSnapshot


@pytest_asyncio.fixture
async def wf_sync_engine() -> AsyncIterator[AsyncEngine]:
    """In-memory aiosqlite engine standing in for the wealthfolio_sync mirror.

    Schema mirrors the real wealthfolio_sync PG tables (defined in
    `infra/stacks/wealthfolio/main.tf`) — we only need the subset that
    `read_account_snapshots_from_pg` reads.
    """
    eng = create_async_engine("sqlite+aiosqlite:///:memory:")
    async with eng.begin() as conn:
        await conn.exec_driver_sql(
            """
            CREATE TABLE accounts (
                id TEXT PRIMARY KEY,
                name TEXT,
                account_type TEXT,
                currency TEXT,
                is_active BOOLEAN
            )
            """)
        await conn.exec_driver_sql(
            """
            CREATE TABLE daily_account_valuation (
                id TEXT PRIMARY KEY,
                account_id TEXT NOT NULL,
                valuation_date DATE NOT NULL,
                account_currency TEXT,
                base_currency TEXT,
                fx_rate_to_base NUMERIC,
                cash_balance NUMERIC,
                investment_market_value NUMERIC,
                total_value NUMERIC,
                cost_basis NUMERIC,
                net_contribution NUMERIC
            )
            """)
    yield eng
    await eng.dispose()


async def _seed_wf_sync(wf_engine: AsyncEngine, valuation_date: date) -> None:
    factory = async_sessionmaker(wf_engine, expire_on_commit=False)
    async with factory() as sess:
        await sess.execute(
            text("INSERT INTO accounts (id, name, account_type, currency, is_active) "
                 "VALUES ('acc-isa', 'ISA', 'ISA', 'GBP', 1)"))
        await sess.execute(
            text("""
                INSERT INTO daily_account_valuation
                  (id, account_id, valuation_date, account_currency, base_currency,
                   fx_rate_to_base, total_value, cost_basis)
                VALUES
                  (:id, 'acc-isa', :d, 'GBP', 'GBP', 1.0, :tv, :cb)
                """),
            {"id": "dav-isa", "d": valuation_date.isoformat(),
             "tv": 1_234_567, "cb": 1_000_000})
        await sess.commit()


@pytest_asyncio.fixture
async def client(
    engine: AsyncEngine,
    session: AsyncSession,
    wf_sync_engine: AsyncEngine,
) -> AsyncIterator[AsyncClient]:
    fp_factory = async_sessionmaker(engine, expire_on_commit=False)
    wf_factory = async_sessionmaker(wf_sync_engine, expire_on_commit=False)

    async def _override_fp() -> AsyncIterator[AsyncSession]:
        async with fp_factory() as s:
            yield s

    async def _override_wf() -> AsyncIterator[AsyncSession]:
        async with wf_factory() as s:
            yield s

    app.dependency_overrides[get_session] = _override_fp
    app.dependency_overrides[get_wf_sync_session] = _override_wf
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://test") as ac:
        yield ac
    app.dependency_overrides.clear()


async def test_networth_refreshes_empty_cache_from_wf_sync(
    client: AsyncClient,
    session: AsyncSession,
    wf_sync_engine: AsyncEngine,
) -> None:
    """Cold cache → first /networth call pulls from wf_sync and upserts."""
    today = date.today()
    await _seed_wf_sync(wf_sync_engine, today)

    # Cache starts empty.
    pre = (await session.execute(select(AccountSnapshot))).scalars().all()
    assert pre == []

    resp = await client.get("/networth")
    assert resp.status_code == 200, resp.text
    body = resp.json()
    assert body["snapshot_date"] == today.isoformat()
    assert Decimal(body["total_gbp"]) == Decimal("1234567.00")

    # Cache populated.
    persisted = (await session.execute(select(AccountSnapshot))).scalars().all()
    assert len(persisted) == 1
    assert persisted[0].account_id == "acc-isa"
    assert persisted[0].snapshot_date == today


async def test_networth_refreshes_stale_cache_from_wf_sync(
    client: AsyncClient,
    session: AsyncSession,
    wf_sync_engine: AsyncEngine,
) -> None:
    """Cache older than TTL → /networth refreshes from wf_sync."""
    today = date.today()
    stale_date = today - timedelta(days=5)

    # Pre-seed account_snapshot with stale data.
    session.add(
        AccountSnapshot(
            external_id="wealthfolio:acc-isa:stale",
            snapshot_date=stale_date,
            account_id="acc-isa",
            account_name="ISA",
            account_type="ISA",
            currency="GBP",
            market_value=Decimal("999"),
            market_value_gbp=Decimal("999"),
        ))
    await session.commit()

    # wf_sync has today's row.
    await _seed_wf_sync(wf_sync_engine, today)

    resp = await client.get("/networth")
    assert resp.status_code == 200
    body = resp.json()
    assert body["snapshot_date"] == today.isoformat()
    assert Decimal(body["total_gbp"]) == Decimal("1234567.00")


async def test_networth_skips_refresh_when_cache_is_fresh(
    client: AsyncClient,
    session: AsyncSession,
    wf_sync_engine: AsyncEngine,
) -> None:
    """Cache fresh (today's date) → no refresh, returns cached value."""
    today = date.today()

    # Cache has today's row with one value.
    session.add(
        AccountSnapshot(
            external_id="wealthfolio:acc-isa:fresh",
            snapshot_date=today,
            account_id="acc-isa",
            account_name="ISA",
            account_type="ISA",
            currency="GBP",
            market_value=Decimal("42"),
            market_value_gbp=Decimal("42"),
        ))
    await session.commit()

    # wf_sync has a DIFFERENT value; if refresh fires the response will
    # carry 1234567, not 42.
    await _seed_wf_sync(wf_sync_engine, today)

    resp = await client.get("/networth")
    assert resp.status_code == 200
    assert Decimal(resp.json()["total_gbp"]) == Decimal("42")