"""Saved searches CRUD — stored queries shown as virtual mailboxes (SPEC §12 M2)."""

from __future__ import annotations

import uuid
from collections.abc import AsyncIterator
from dataclasses import dataclass

import httpx
import pytest_asyncio
from httpx import ASGITransport
from sqlalchemy import delete
from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
from sqlalchemy.pool import NullPool

from app.config import get_settings
from app.identity.passwords import hash_password
from app.identity.sessions import create_session
from app.main import create_app
from app.models import User

CSRF = "csrf"


@dataclass
class Ctx:
    client: httpx.AsyncClient
    user_id: uuid.UUID


def _hdr() -> dict[str, str]:
    return {"X-CSRF": CSRF}


@pytest_asyncio.fixture
async def ctx() -> AsyncIterator[Ctx]:
    engine = create_async_engine(get_settings().database_url, poolclass=NullPool)
    sm = async_sessionmaker(engine, expire_on_commit=False)
    session = sm()
    user = User(handle=f"ss{uuid.uuid4().hex[:8]}@test.local", password_hash=hash_password("pw"))
    session.add(user)
    await session.commit()
    token = await create_session(user.id, "pytest")
    client = httpx.AsyncClient(
        transport=ASGITransport(app=create_app()),
        base_url="http://testserver",
        cookies={"session": token, "csrf": CSRF},
    )
    try:
        yield Ctx(client=client, user_id=user.id)
    finally:
        await client.aclose()
        await session.execute(delete(User).where(User.id == user.id))
        await session.commit()
        await session.close()
        await engine.dispose()


async def test_saved_search_crud_and_upsert(ctx: Ctx) -> None:
    # Empty to start.
    resp = await ctx.client.get("/api/saved-searches")
    assert resp.status_code == 200
    assert resp.json() == []

    # Create.
    resp = await ctx.client.post(
        "/api/saved-searches",
        json={"name": "Unread from boss", "query": "is:unread from:boss"},
        headers=_hdr(),
    )
    assert resp.status_code == 200
    created = resp.json()
    assert created["name"] == "Unread from boss"
    assert created["query"] == "is:unread from:boss"
    assert created["pinned"] is True
    sid = created["id"]

    # It lists back.
    resp = await ctx.client.get("/api/saved-searches")
    assert [s["name"] for s in resp.json()] == ["Unread from boss"]

    # Re-saving under the same name upserts (updates query, keeps a single row).
    resp = await ctx.client.post(
        "/api/saved-searches",
        json={"name": "Unread from boss", "query": "is:unread from:ceo"},
        headers=_hdr(),
    )
    assert resp.status_code == 200
    assert resp.json()["id"] == sid  # same row
    assert resp.json()["query"] == "is:unread from:ceo"

    rows = (await ctx.client.get("/api/saved-searches")).json()
    assert len(rows) == 1 and rows[0]["query"] == "is:unread from:ceo"

    # Delete.
    resp = await ctx.client.delete(f"/api/saved-searches/{sid}", headers=_hdr())
    assert resp.status_code == 200
    assert (await ctx.client.get("/api/saved-searches")).json() == []

    # Deleting a missing row 404s.
    resp = await ctx.client.delete(f"/api/saved-searches/{uuid.uuid4()}", headers=_hdr())
    assert resp.status_code == 404


async def test_saved_search_requires_csrf(ctx: Ctx) -> None:
    # No CSRF header -> rejected (state-changing route).
    resp = await ctx.client.post("/api/saved-searches", json={"name": "x", "query": "y"})
    assert resp.status_code == 403


async def test_saved_search_is_per_user(ctx: Ctx) -> None:
    await ctx.client.post(
        "/api/saved-searches",
        json={"name": "Mine", "query": "in:inbox"},
        headers=_hdr(),
    )
    # A different user's client sees none of the above.
    other = User(handle=f"ss{uuid.uuid4().hex[:8]}@test.local", password_hash=hash_password("pw"))
    engine = create_async_engine(get_settings().database_url, poolclass=NullPool)
    sm = async_sessionmaker(engine, expire_on_commit=False)
    session = sm()
    session.add(other)
    await session.commit()
    token = await create_session(other.id, "pytest")
    try:
        client = httpx.AsyncClient(
            transport=ASGITransport(app=create_app()),
            base_url="http://testserver",
            cookies={"session": token, "csrf": CSRF},
        )
        try:
            assert (await client.get("/api/saved-searches")).json() == []
        finally:
            await client.aclose()
    finally:
        await session.execute(delete(User).where(User.id == other.id))
        await session.commit()
        await session.close()
        await engine.dispose()