"""AP2.2f — Backlog Epic-Hierarchie (parent_backlog_id + item_kind epic)."""

from __future__ import annotations

from tests.factories import provision_user_in_tenant
from tests.test_initiatives_actions import _auth, _create_initiative, _login


def _create_product_initiative(client, token, title="Epic Product"):
    created = _create_initiative(
        client,
        token,
        title=title,
        archetype_key="initiative.product",
    )
    assert created.status_code == 201
    return created.json()["id"]


def test_create_epic_and_story_under_epic(client):
    user = provision_user_in_tenant(tenant_role="admin")
    token = _login(client, user)
    initiative_id = _create_product_initiative(client, token)

    epic = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={"title": "Checkout Epic", "item_kind": "epic", "status": "accepted"},
        headers=_auth(token),
    )
    assert epic.status_code == 201
    epic_id = epic.json()["id"]
    assert epic.json()["item_kind"] == "epic"
    assert epic.json().get("parent_backlog_id") is None

    story = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={
            "title": "Login Story",
            "item_kind": "story",
            "parent_backlog_id": epic_id,
            "status": "accepted",
        },
        headers=_auth(token),
    )
    assert story.status_code == 201
    assert story.json()["parent_backlog_id"] == epic_id

    listed = client.get(
        f"/api/initiatives/{initiative_id}/backlog",
        headers=_auth(token),
    )
    assert listed.status_code == 200
    by_id = {item["id"]: item for item in listed.json()}
    assert by_id[story.json()["id"]]["parent_backlog_id"] == epic_id


def test_epic_cannot_convert_to_action(client):
    user = provision_user_in_tenant(tenant_role="admin")
    token = _login(client, user)
    initiative_id = _create_product_initiative(client, token, title="Epic Convert Block")

    epic = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={"title": "Big Epic", "item_kind": "epic", "status": "accepted"},
        headers=_auth(token),
    )
    epic_id = epic.json()["id"]

    converted = client.post(
        f"/api/backlog/{epic_id}/convert-to-action",
        json={},
        headers=_auth(token),
    )
    assert converted.status_code == 400
    assert "Epic" in converted.json()["detail"]


def test_story_under_epic_converts_to_action(client):
    user = provision_user_in_tenant(tenant_role="admin")
    token = _login(client, user)
    initiative_id = _create_product_initiative(client, token, title="Story Convert")

    epic = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={"title": "Epic", "item_kind": "epic", "status": "accepted"},
        headers=_auth(token),
    )
    epic_id = epic.json()["id"]

    story = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={
            "title": "Story",
            "item_kind": "story",
            "parent_backlog_id": epic_id,
            "status": "accepted",
        },
        headers=_auth(token),
    )
    story_id = story.json()["id"]

    converted = client.post(
        f"/api/backlog/{story_id}/convert-to-action",
        json={},
        headers=_auth(token),
    )
    assert converted.status_code == 201
    assert converted.json()["action"]["title"] == "Story"


def test_cannot_delete_epic_with_children(client):
    user = provision_user_in_tenant(tenant_role="admin")
    token = _login(client, user)
    initiative_id = _create_product_initiative(client, token, title="Epic Delete Guard")

    epic = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={"title": "Epic", "item_kind": "epic", "status": "accepted"},
        headers=_auth(token),
    )
    epic_id = epic.json()["id"]

    client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={
            "title": "Child Story",
            "item_kind": "story",
            "parent_backlog_id": epic_id,
            "status": "new",
        },
        headers=_auth(token),
    )

    deleted = client.delete(f"/api/backlog/{epic_id}", headers=_auth(token))
    assert deleted.status_code == 400
    assert "untergeordneten" in deleted.json()["detail"]


def test_epic_cannot_have_parent_backlog(client):
    user = provision_user_in_tenant(tenant_role="admin")
    token = _login(client, user)
    initiative_id = _create_product_initiative(client, token, title="Epic Parent Guard")

    epic_a = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={"title": "Epic A", "item_kind": "epic", "status": "accepted"},
        headers=_auth(token),
    )
    epic_a_id = epic_a.json()["id"]

    epic_b = client.post(
        f"/api/initiatives/{initiative_id}/backlog",
        json={
            "title": "Epic B",
            "item_kind": "epic",
            "parent_backlog_id": epic_a_id,
            "status": "accepted",
        },
        headers=_auth(token),
    )
    assert epic_b.status_code == 400