"""Tests for /networth and /networth/history."""
from __future__ import annotations

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

import pytest_asyncio
from httpx import ASGITransport, AsyncClient
from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker

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


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

    async def _override() -> AsyncIterator[AsyncSession]:
        async with factory() as s:
            yield s

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


async def _seed_snapshots(session: AsyncSession) -> None:
    rows = [
        AccountSnapshot(
            external_id="wealthfolio:isa:2026-04-23",
            snapshot_date=date(2026, 4, 23),
            account_id="isa",
            account_name="ISA",
            account_type="ISA",
            currency="GBP",
            market_value=Decimal("280000"),
            market_value_gbp=Decimal("280000"),
        ),
        AccountSnapshot(
            external_id="wealthfolio:schwab:2026-04-23",
            snapshot_date=date(2026, 4, 23),
            account_id="schwab",
            account_name="Schwab",
            account_type="BROKERAGE",
            currency="USD",
            market_value=Decimal("780000"),
            market_value_gbp=Decimal("615000"),
        ),
        AccountSnapshot(
            external_id="wealthfolio:isa:2026-04-25",
            snapshot_date=date(2026, 4, 25),
            account_id="isa",
            account_name="ISA",
            account_type="ISA",
            currency="GBP",
            market_value=Decimal("300000"),
            market_value_gbp=Decimal("300000"),
        ),
        AccountSnapshot(
            external_id="wealthfolio:schwab:2026-04-25",
            snapshot_date=date(2026, 4, 25),
            account_id="schwab",
            account_name="Schwab",
            account_type="BROKERAGE",
            currency="USD",
            market_value=Decimal("800000"),
            market_value_gbp=Decimal("640000"),
        ),
    ]
    for r in rows:
        session.add(r)
    await session.commit()


async def test_get_networth_returns_latest(client: AsyncClient, session: AsyncSession) -> None:
    await _seed_snapshots(session)
    resp = await client.get("/networth")
    assert resp.status_code == 200
    body = resp.json()
    assert body["snapshot_date"] == "2026-04-25"
    assert Decimal(body["total_gbp"]) == Decimal("940000")
    by_id = {a["account_id"]: a for a in body["accounts"]}
    assert Decimal(by_id["isa"]["market_value_gbp"]) == Decimal("300000")
    assert Decimal(by_id["schwab"]["market_value_gbp"]) == Decimal("640000")


async def test_get_networth_empty_when_no_snapshots(client: AsyncClient) -> None:
    resp = await client.get("/networth")
    assert resp.status_code == 200
    body = resp.json()
    assert body["accounts"] == []
    assert Decimal(body["total_gbp"]) == Decimal("0")


async def test_networth_history_returns_per_date(client: AsyncClient,
                                                 session: AsyncSession) -> None:
    await _seed_snapshots(session)
    resp = await client.get("/networth/history")
    assert resp.status_code == 200
    points = resp.json()["points"]
    assert len(points) == 2
    by_date = {p["snapshot_date"]: p for p in points}
    assert Decimal(by_date["2026-04-23"]["total_gbp"]) == Decimal("895000")
    assert Decimal(by_date["2026-04-25"]["total_gbp"]) == Decimal("940000")
    assert Decimal(by_date["2026-04-25"]["by_account"]["ISA"]) == Decimal("300000")


async def test_networth_history_respects_days_filter(
    client: AsyncClient,
    session: AsyncSession,
) -> None:
    await _seed_snapshots(session)
    resp = await client.get("/networth/history?days=1")
    assert resp.status_code == 200
    # days=1 ⇒ only the latest 1 distinct date
    assert len(resp.json()["points"]) == 1