"""
Core router tests: topics, domains, workstreams, tasks, decisions, state summary.

Happy path + key error cases. All tests use a real PostgreSQL test database
(no mocking). The `client` fixture provides an httpx.AsyncClient backed by
the FastAPI ASGI app.
"""
from __future__ import annotations

import pytest


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

async def _create_domain(client, slug="testdomain", name="Test Domain"):
    r = await client.post("/domains/", json={"slug": slug, "name": name})
    assert r.status_code == 201, r.text
    return r.json()


async def _create_topic(client, domain_slug="testdomain", slug="testtopic", title="Test Topic"):
    r = await client.post("/topics/", json={
        "slug": slug, "title": title, "domain": domain_slug,
    })
    assert r.status_code == 201, r.text
    return r.json()


async def _create_workstream(client, topic_id, slug="test-ws", title="Test WS"):
    r = await client.post("/workstreams/", json={
        "topic_id": topic_id, "slug": slug, "title": title,
    })
    assert r.status_code == 201, r.text
    return r.json()


async def _create_task(client, workstream_id, title="Test task"):
    r = await client.post("/tasks/", json={
        "workstream_id": workstream_id, "title": title,
    })
    assert r.status_code == 201, r.text
    return r.json()


# ---------------------------------------------------------------------------
# Domain tests
# ---------------------------------------------------------------------------

class TestDomains:
    async def test_create_and_list(self, client):
        await _create_domain(client)
        r = await client.get("/domains/")
        assert r.status_code == 200
        slugs = [d["slug"] for d in r.json()]
        assert "testdomain" in slugs

    async def test_duplicate_slug_returns_409(self, client):
        await _create_domain(client)
        r = await client.post("/domains/", json={"slug": "testdomain", "name": "Dupe"})
        assert r.status_code == 409


# ---------------------------------------------------------------------------
# Topic tests
# ---------------------------------------------------------------------------

class TestTopics:
    async def test_create_and_get(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        r = await client.get(f"/topics/{topic['id']}")
        assert r.status_code == 200
        assert r.json()["slug"] == "testtopic"

    async def test_duplicate_slug_returns_409(self, client):
        await _create_domain(client)
        await _create_topic(client)
        r = await client.post("/topics/", json={
            "slug": "testtopic", "title": "Dupe", "domain": "testdomain",
        })
        assert r.status_code == 409

    async def test_unknown_domain_returns_404(self, client):
        r = await client.post("/topics/", json={
            "slug": "x", "title": "X", "domain": "doesnotexist",
        })
        assert r.status_code == 404


# ---------------------------------------------------------------------------
# Workstream tests
# ---------------------------------------------------------------------------

class TestWorkstreams:
    async def test_create_and_list_by_topic(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])

        r = await client.get(f"/workstreams/?topic_id={topic['id']}")
        assert r.status_code == 200
        ids = [w["id"] for w in r.json()]
        assert ws["id"] in ids

    async def test_status_transition(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])

        r = await client.patch(f"/workstreams/{ws['id']}", json={"status": "completed"})
        assert r.status_code == 200
        assert r.json()["status"] == "completed"

    async def test_filter_by_owner(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        await client.patch(f"/workstreams/{ws['id']}", json={"owner": "alice"})

        r = await client.get("/workstreams/?owner=alice")
        assert r.status_code == 200
        assert len(r.json()) == 1
        assert r.json()[0]["id"] == ws["id"]

    async def test_filter_by_slug(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"], slug="my-special-ws")

        r = await client.get("/workstreams/?slug=my-special-ws")
        assert r.status_code == 200
        assert len(r.json()) == 1


# ---------------------------------------------------------------------------
# Task tests
# ---------------------------------------------------------------------------

class TestTasks:
    async def test_create_and_list_by_workstream(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.get(f"/tasks/?workstream_id={ws['id']}")
        assert r.status_code == 200
        ids = [t["id"] for t in r.json()]
        assert task["id"] in ids

    async def test_needs_human_flag(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={
            "needs_human": True,
            "intervention_note": "needs review",
        })
        assert r.status_code == 200
        assert r.json()["needs_human"] is True

    async def test_needs_human_without_note_returns_422(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={"needs_human": True})
        assert r.status_code == 422

    async def test_cancel_via_delete(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.delete(f"/tasks/{task['id']}")
        assert r.status_code == 200
        assert r.json()["status"] == "cancelled"

    async def test_filter_by_priority(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        await client.post("/tasks/", json={
            "workstream_id": ws["id"], "title": "High prio", "priority": "high",
        })
        await client.post("/tasks/", json={
            "workstream_id": ws["id"], "title": "Low prio", "priority": "low",
        })

        r = await client.get(f"/tasks/?workstream_id={ws['id']}&priority=high")
        assert r.status_code == 200
        titles = [t["title"] for t in r.json()]
        assert "High prio" in titles
        assert "Low prio" not in titles


# ---------------------------------------------------------------------------
# Decision tests
# ---------------------------------------------------------------------------

class TestDecisions:
    async def test_create_and_resolve(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        r = await client.post("/decisions/", json={
            "title": "Should we use X?",
            "topic_id": topic["id"],
        })
        assert r.status_code == 201
        d_id = r.json()["id"]

        r2 = await client.post(f"/decisions/{d_id}/resolve", json={
            "rationale": "Yes, use X.",
            "decided_by": "bernd",
        })
        assert r2.status_code == 200
        assert r2.json()["status"] == "resolved"

    async def test_resolve_already_resolved_returns_409(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        r = await client.post("/decisions/", json={
            "title": "Already done", "topic_id": topic["id"],
        })
        d_id = r.json()["id"]
        await client.post(f"/decisions/{d_id}/resolve", json={"rationale": "Done", "decided_by": "bernd"})

        r2 = await client.post(f"/decisions/{d_id}/resolve", json={"rationale": "Again", "decided_by": "bernd"})
        assert r2.status_code == 409

    async def test_financial_keyword_auto_escalates(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        r = await client.post("/decisions/", json={
            "title": "Purchase cloud credits",
            "topic_id": topic["id"],
            "decision_type": "pending",
        })
        assert r.status_code == 201
        body = r.json()
        assert body["status"] == "escalated"
        assert body["escalation_note"]


# ---------------------------------------------------------------------------
# State summary
# ---------------------------------------------------------------------------

class TestStateSummary:
    async def test_summary_returns_expected_shape(self, client):
        r = await client.get("/state/summary")
        assert r.status_code == 200
        body = r.json()
        assert "open_workstreams" in body
        assert "blocking_decisions" in body
        assert "blocked_tasks" in body
        assert "domains" in body

    async def test_summary_counts_reflect_created_data(self, client):
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])
        # Mark as blocked so it shows in blocked_tasks
        await client.patch(f"/tasks/{task['id']}",
                           json={"status": "blocked", "blocking_reason": "waiting on dep"})

        r = await client.get("/state/summary")
        body = r.json()
        assert len(body["blocked_tasks"]) >= 1