"""Tests for /life-events and /goals."""
from __future__ import annotations

from collections.abc import AsyncIterator
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 Scenario


@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_scenario(session: AsyncSession) -> int:
    scen = Scenario(
        external_id="user-host",
        kind="user",
        name="Host plan",
        jurisdiction="uk",
        strategy="trinity",
        leave_uk_year=0,
        glide_path="static",
        spending_gbp=Decimal("60000"),
        nw_seed_gbp=Decimal("1000000"),
        savings_per_year_gbp=Decimal("0"),
        config_json={},
    )
    session.add(scen)
    await session.commit()
    await session.refresh(scen)
    return scen.id


# ── life events ──────────────────────────────────────────────────────


async def test_create_and_list_life_events(client: AsyncClient, session: AsyncSession) -> None:
    sid = await _seed_scenario(session)
    create = await client.post(
        f"/scenarios/{sid}/life-events",
        json={
            "kind": "retirement",
            "name": "Retire at 50",
            "year_start": 15,
            "year_end": 15,
        },
    )
    assert create.status_code == 201, create.text
    listed = await client.get(f"/scenarios/{sid}/life-events")
    assert listed.status_code == 200
    body = listed.json()
    assert len(body) == 1
    assert body[0]["name"] == "Retire at 50"


async def test_life_event_year_validation(client: AsyncClient, session: AsyncSession) -> None:
    sid = await _seed_scenario(session)
    resp = await client.post(
        f"/scenarios/{sid}/life-events",
        json={
            "kind": "expense_range",
            "name": "Bad range",
            "year_start": 20,
            "year_end": 5,
        },
    )
    assert resp.status_code == 400


async def test_life_event_unknown_scenario(client: AsyncClient) -> None:
    resp = await client.get("/scenarios/9999/life-events")
    assert resp.status_code == 404


async def test_patch_life_event(client: AsyncClient, session: AsyncSession) -> None:
    sid = await _seed_scenario(session)
    create = await client.post(
        f"/scenarios/{sid}/life-events",
        json={"kind": "retirement", "name": "Retire", "year_start": 15},
    )
    eid = create.json()["id"]
    resp = await client.patch(f"/life-events/{eid}",
                              json={"year_start": 20, "name": "Retire at 55"})
    assert resp.status_code == 200
    body = resp.json()
    assert body["year_start"] == 20
    assert body["name"] == "Retire at 55"


async def test_delete_life_event(client: AsyncClient, session: AsyncSession) -> None:
    sid = await _seed_scenario(session)
    create = await client.post(
        f"/scenarios/{sid}/life-events",
        json={"kind": "retirement", "name": "X", "year_start": 5},
    )
    eid = create.json()["id"]
    resp = await client.delete(f"/life-events/{eid}")
    assert resp.status_code == 204
    listed = await client.get(f"/scenarios/{sid}/life-events")
    assert listed.json() == []


# ── goals ────────────────────────────────────────────────────────────


async def test_create_and_list_goals(client: AsyncClient, session: AsyncSession) -> None:
    sid = await _seed_scenario(session)
    create = await client.post(
        f"/scenarios/{sid}/goals",
        json={
            "kind": "target_nw",
            "name": "≥ £2M at 50",
            "target_amount_gbp": "2000000",
            "target_year": 15,
            "comparator": ">=",
            "success_threshold": "0.90",
        },
    )
    assert create.status_code == 201, create.text
    listed = await client.get(f"/scenarios/{sid}/goals")
    assert len(listed.json()) == 1
    assert Decimal(listed.json()[0]["target_amount_gbp"]) == Decimal("2000000")


async def test_delete_goal(client: AsyncClient, session: AsyncSession) -> None:
    sid = await _seed_scenario(session)
    create = await client.post(
        f"/scenarios/{sid}/goals",
        json={"kind": "never_run_out", "name": "Last to 95", "target_year": 65},
    )
    gid = create.json()["id"]
    resp = await client.delete(f"/goals/{gid}")
    assert resp.status_code == 204