import pytest
import uuid
from httpx import AsyncClient, ASGITransport
from fastapi import status


def test_e2e(client):
    # 1) Service is alive
    alive = client.get("/")
    assert alive.status_code == status.HTTP_200_OK

    # 2) Attempt to login without payload should fail fast (validation error)
    login = client.post("/auth/jwt/login")
    assert login.status_code in (status.HTTP_400_BAD_REQUEST, status.HTTP_422_UNPROCESSABLE_CONTENT)

    # 3) Protected endpoint should not be accessible without token
    me = client.get("/users/me")
    assert me.status_code in (status.HTTP_401_UNAUTHORIZED, status.HTTP_403_FORBIDDEN)


@pytest.mark.asyncio
async def test_e2e_full_user_lifecycle(fastapi_app, test_user):
    # Use an AsyncClient with ASGITransport for async tests
    transport = ASGITransport(app=fastapi_app, raise_app_exceptions=True)
    async with AsyncClient(transport=transport, base_url="http://testserver") as ac:
        login_payload = test_user

        # 1. Log in with the new credentials
        login_resp = await ac.post("/auth/jwt/login", data=login_payload)
        assert login_resp.status_code == status.HTTP_200_OK
        token = login_resp.json()["access_token"]
        headers = {"Authorization": f"Bearer {token}"}

        # 2. Access a protected endpoint
        me_resp = await ac.get("/users/me", headers=headers)
        assert me_resp.status_code == status.HTTP_200_OK
        assert me_resp.json()["email"] == test_user["username"]

        # 3. Update the user's profile
        update_payload = {"first_name": "Test"}
        patch_resp = await ac.patch("/users/me", json=update_payload, headers=headers)
        assert patch_resp.status_code == status.HTTP_200_OK
        assert patch_resp.json()["first_name"] == "Test"

        # 4. Log out
        logout_resp = await ac.post("/auth/jwt/logout", headers=headers)
        assert logout_resp.status_code in (status.HTTP_200_OK, status.HTTP_204_NO_CONTENT)

        # 5. Verify token is invalid
        me_again_resp = await ac.get("/users/me", headers=headers)
        assert me_again_resp.status_code == status.HTTP_401_UNAUTHORIZED


@pytest.mark.asyncio
async def test_e2e_transaction_workflow(fastapi_app, test_user):
    transport = ASGITransport(app=fastapi_app, raise_app_exceptions=True)
    async with AsyncClient(transport=transport, base_url="http://testserver") as ac:
        # 1. Log in to get the token
        login_resp = await ac.post("/auth/jwt/login", data=test_user)
        token = login_resp.json()["access_token"]
        headers = {"Authorization": f"Bearer {token}"}

        # NEW STEP: Create a category first to get a valid ID
        category_payload = {"name": "Test Category for E2E"}
        create_category_resp = await ac.post("/categories/create", json=category_payload, headers=headers)
        assert create_category_resp.status_code == status.HTTP_201_CREATED
        category_id = create_category_resp.json()["id"]

        # 2. Create a new transaction
        tx_payload = {"amount": -55.40, "description": "Milk and eggs"}
        tx_resp = await ac.post("/transactions/create", json=tx_payload, headers=headers)
        assert tx_resp.status_code == status.HTTP_201_CREATED
        tx_id = tx_resp.json()["id"]

        # 3. Assign the category
        assign_resp = await ac.post(f"/transactions/{tx_id}/categories/{category_id}", headers=headers)
        assert assign_resp.status_code == status.HTTP_200_OK

        # 4. Verify assignment
        get_tx_resp = await ac.get(f"/transactions/{tx_id}", headers=headers)
        assert category_id in get_tx_resp.json()["category_ids"]

        # 5. Unassign the category
        unassign_resp = await ac.delete(f"/transactions/{tx_id}/categories/{category_id}", headers=headers)
        assert unassign_resp.status_code == status.HTTP_200_OK

        # 6. Get the transaction again and verify the category is gone
        get_tx_again_resp = await ac.get(f"/transactions/{tx_id}", headers=headers)
        final_tx_data = get_tx_again_resp.json()
        assert category_id not in final_tx_data["category_ids"]

        # 7. Delete the transaction for cleanup
        delete_resp = await ac.delete(f"/transactions/{tx_id}/delete", headers=headers)
        assert delete_resp.status_code in (status.HTTP_200_OK, status.HTTP_204_NO_CONTENT)

        # NEW STEP: Clean up the created category
        delete_category_resp = await ac.delete(f"/categories/{category_id}", headers=headers)
        assert delete_category_resp.status_code in (status.HTTP_200_OK, status.HTTP_204_NO_CONTENT)

@pytest.mark.asyncio
async def test_register_then_login_and_fetch_me(fastapi_app):
    transport = ASGITransport(app=fastapi_app, raise_app_exceptions=True)
    async with AsyncClient(transport=transport, base_url="http://testserver") as ac:
        email = "newuser@example.com"
        password = "StrongPassw0rd!"
        reg = await ac.post("/auth/register", json={"email": email, "password": password})
        assert reg.status_code in (status.HTTP_201_CREATED, status.HTTP_200_OK)

        login = await ac.post("/auth/jwt/login", data={"username": email, "password": password})
        assert login.status_code == status.HTTP_200_OK
        token = login.json()["access_token"]
        me = await ac.get("/users/me", headers={"Authorization": f"Bearer {token}"})
        assert me.status_code == status.HTTP_200_OK
        assert me.json()["email"] == email


@pytest.mark.asyncio
async def test_delete_current_user_revokes_access(fastapi_app):
    transport = ASGITransport(app=fastapi_app, raise_app_exceptions=True)
    async with AsyncClient(transport=transport, base_url="http://testserver") as ac:
        email = "todelete@example.com"
        password = "Passw0rd!"
        reg = await ac.post("/auth/register", json={"email": email, "password": password})
        assert reg.status_code in (status.HTTP_200_OK, status.HTTP_201_CREATED)

        login = await ac.post("/auth/jwt/login", data={"username": email, "password": password})
        token = login.json()["access_token"]
        headers = {"Authorization": f"Bearer {token}"}

        # Delete self
        d = await ac.delete("/users/me", headers=headers)
        assert d.status_code == status.HTTP_204_NO_CONTENT

        # Access should now fail
        me = await ac.get("/users/me", headers=headers)
        assert me.status_code in (status.HTTP_401_UNAUTHORIZED, status.HTTP_403_FORBIDDEN)


@pytest.mark.asyncio
async def test_update_category_conflict_and_404(fastapi_app, test_user):
    transport = ASGITransport(app=fastapi_app)
    async with AsyncClient(transport=transport, base_url="http://testserver") as ac:
        token = (await ac.post("/auth/jwt/login", data=test_user)).json()["access_token"]
        h = {"Authorization": f"Bearer {token}"}

        a = (await ac.post("/categories/create", json={"name": "A"}, headers=h)).json()
        b = (await ac.post("/categories/create", json={"name": "B"}, headers=h)).json()

        # Attempt to rename A -> B should conflict
        conflict = await ac.patch(f"/categories/{a['id']}", json={"name": "B"}, headers=h)
        assert conflict.status_code == status.HTTP_409_CONFLICT

        # Update non-existent
        missing = await ac.patch("/categories/999999", json={"name": "Z"}, headers=h)
        assert missing.status_code == status.HTTP_404_NOT_FOUND

@pytest.mark.asyncio
async def test_category_cross_user_isolation(fastapi_app):
    transport = ASGITransport(app=fastapi_app)
    async with AsyncClient(transport=transport, base_url="http://testserver") as ac:
        # user1
        u1 = {"email": "u1@example.com", "password": "Aaaaaa1!"}
        assert (await ac.post("/auth/register", json=u1)).status_code in (200, 201)
        t1 = (await ac.post("/auth/jwt/login", data={"username": u1["email"], "password": u1["password"]})).json()["access_token"]

        # user1 creates a category
        c = (await ac.post("/categories/create", json={"name": "Private"}, headers={"Authorization": f"Bearer {t1}"})).json()

        # user2
        u2 = {"email": "u2@example.com", "password": "Aaaaaa1!"}
        assert (await ac.post("/auth/register", json=u2)).status_code in (200, 201)
        t2 = (await ac.post("/auth/jwt/login", data={"username": u2["email"], "password": u2["password"]})).json()["access_token"]

        # user2 cannot read/delete user1's category
        g = await ac.get(f"/categories/{c['id']}", headers={"Authorization": f"Bearer {t2}"})
        assert g.status_code == status.HTTP_404_NOT_FOUND
        d = await ac.delete(f"/categories/{c['id']}", headers={"Authorization": f"Bearer {t2}"})
        assert d.status_code == status.HTTP_404_NOT_FOUND