"""CUST-WP-0074-T02: derived wait_kind / blocked_kind read-model fields and the
from_task_id dependency edge. Real PostgreSQL via the shared `client` fixture."""
from __future__ import annotations

import pytest

from api.services.wait_kind import derive_blocked_kind, derive_wait_kind
from tests.conftest import create_test_domain, create_test_repo, create_test_workplan


class TestDeriveFunctions:
    def test_wait_kind_by_qualifiers(self):
        assert derive_wait_kind("todo", needs_human=True, has_dependency=True) is None
        assert derive_wait_kind("wait", needs_human=False, has_dependency=False) == "unqualified"
        assert derive_wait_kind("wait", needs_human=False, has_dependency=True) == "external"
        assert derive_wait_kind("wait", needs_human=True, has_dependency=False) == "human"
        assert derive_wait_kind("wait", needs_human=True, has_dependency=True) == "both"

    def test_blocked_kind_prefers_human(self):
        assert derive_blocked_kind("active", ["human"]) is None
        assert derive_blocked_kind("blocked", []) == "none"
        assert derive_blocked_kind("blocked", ["unqualified", None]) == "none"
        assert derive_blocked_kind("blocked", ["external", "unqualified"]) == "external"
        assert derive_blocked_kind("blocked", ["external", "human"]) == "human"
        assert derive_blocked_kind("blocked", ["both"]) == "human"


async def _task(client, workplan_id, title, **extra):
    r = await client.post("/tasks/", json={"workplan_id": workplan_id, "title": title, **extra})
    assert r.status_code == 201, r.text
    return r.json()


@pytest.mark.asyncio
async def test_wait_kind_and_blocked_kind_on_read_routes(client):
    domain = await create_test_domain(client)
    repo = await create_test_repo(client, domain_slug=domain["slug"])
    upstream = await create_test_workplan(client, repo["id"], slug="upstream", status="active")
    blocked = await create_test_workplan(client, repo["id"], slug="blocked", status="blocked")

    human = await _task(
        client, blocked["id"], "human gate", status="wait",
        needs_human=True, blocking_reason="operator must provision creds",
        intervention_note="operator must provision creds", decision_id="CCR-2026-0004",
    )
    external = await _task(
        client, blocked["id"], "external", status="wait", blocking_reason="upstream first",
    )
    unqualified = await _task(client, blocked["id"], "unqualified", status="wait", blocking_reason="?")
    todo = await _task(client, blocked["id"], "plain todo")

    r = await client.post(
        f"/workplans/{blocked['id']}/dependencies/",
        json={"from_task_id": external["id"], "to_workplan_id": upstream["id"]},
    )
    assert r.status_code == 201, r.text
    assert r.json()["from_task_id"] == external["id"]

    r = await client.get("/tasks/", params={"workplan_id": blocked["id"]})
    assert r.status_code == 200
    kinds = {row["title"]: row["wait_kind"] for row in r.json()}
    assert kinds == {
        "human gate": "human", "external": "external", "unqualified": "unqualified", "plain todo": None,
    }
    r = await client.get(f"/tasks/{human['id']}")
    assert r.json()["wait_kind"] == "human"
    assert r.json()["decision_id"] == "CCR-2026-0004"

    r = await client.get(f"/workplans/{blocked['id']}")
    assert r.json()["blocked_kind"] == "human"
    r = await client.get(f"/workplans/{upstream['id']}")
    assert r.json()["blocked_kind"] is None

    # Human gate lifted → the workplan is blocked on the external wait only.
    r = await client.patch(f"/tasks/{human['id']}", json={"status": "done"})
    assert r.status_code == 200, r.text
    r = await client.get("/workplans/", params={"repo_id": repo["id"]})
    kinds = {row["slug"]: row["blocked_kind"] for row in r.json()}
    assert kinds == {"upstream": None, "blocked": "external"}

    # Dependency and human flag together → both.
    r = await client.patch(
        f"/tasks/{external['id']}",
        json={"needs_human": True, "intervention_note": "confirm with owner"},
    )
    assert r.status_code == 200, r.text
    r = await client.get(f"/tasks/{external['id']}")
    assert r.json()["wait_kind"] == "both"
    del unqualified, todo


@pytest.mark.asyncio
async def test_from_task_must_belong_to_the_from_workplan(client):
    domain = await create_test_domain(client)
    repo = await create_test_repo(client, domain_slug=domain["slug"])
    a = await create_test_workplan(client, repo["id"], slug="a")
    b = await create_test_workplan(client, repo["id"], slug="b")
    task_in_b = await _task(client, b["id"], "in b")
    r = await client.post(
        f"/workplans/{a['id']}/dependencies/",
        json={"from_task_id": task_in_b["id"], "to_workplan_id": b["id"]},
    )
    assert r.status_code == 404
    r = await client.post(
        f"/workplans/{b['id']}/dependencies/",
        json={"from_task_id": task_in_b["id"], "to_task_id": task_in_b["id"]},
    )
    assert r.status_code == 422


@pytest.mark.asyncio
async def test_two_tasks_may_wait_on_the_same_target(client):
    domain = await create_test_domain(client)
    repo = await create_test_repo(client, domain_slug=domain["slug"])
    upstream = await create_test_workplan(client, repo["id"], slug="upstream")
    wp = await create_test_workplan(client, repo["id"], slug="waiting")
    t1 = await _task(client, wp["id"], "t1")
    t2 = await _task(client, wp["id"], "t2")
    for task in (t1, t2):
        r = await client.post(
            f"/workplans/{wp['id']}/dependencies/",
            json={"from_task_id": task["id"], "to_workplan_id": upstream["id"]},
        )
        assert r.status_code == 201, r.text
    r = await client.get(f"/workplans/{wp['id']}/dependencies/")
    assert sorted(row["from_task_id"] for row in r.json()) == sorted([t1["id"], t2["id"]])