"""Tests for the Kanban dashboard plugin backend (plugins/kanban/dashboard/plugin_api.py).

The plugin mounts as /api/plugins/kanban/ inside the dashboard's FastAPI app,
but here we attach its router to a bare FastAPI instance so we can test the
REST surface without spinning up the whole dashboard.
"""

from __future__ import annotations

import importlib.util
import os
import sys
import time
from pathlib import Path

import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

from hermes_cli import kanban_db as kb


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------


def _load_plugin_router():
    """Dynamically load plugins/kanban/dashboard/plugin_api.py and return its router."""
    repo_root = Path(__file__).resolve().parents[2]
    plugin_file = repo_root / "plugins" / "kanban" / "dashboard" / "plugin_api.py"
    assert plugin_file.exists(), f"plugin file missing: {plugin_file}"

    spec = importlib.util.spec_from_file_location(
        "hermes_dashboard_plugin_kanban_test", plugin_file,
    )
    assert spec is not None and spec.loader is not None
    mod = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = mod
    spec.loader.exec_module(mod)
    return mod.router


@pytest.fixture
def kanban_home(tmp_path, monkeypatch):
    """Isolated HERMES_HOME with an empty kanban DB."""
    home = tmp_path / ".hermes"
    home.mkdir()
    monkeypatch.setenv("HERMES_HOME", str(home))
    monkeypatch.setattr(Path, "home", lambda: tmp_path)
    kb.init_db()
    return home


@pytest.fixture
def client(kanban_home):
    app = FastAPI()
    app.include_router(_load_plugin_router(), prefix="/api/plugins/kanban")
    return TestClient(app)


# ---------------------------------------------------------------------------
# GET /board on an empty DB
# ---------------------------------------------------------------------------


def test_board_empty(client):
    r = client.get("/api/plugins/kanban/board")
    assert r.status_code == 200
    data = r.json()
    # All canonical columns present (triage + the rest), each empty.
    names = [c["name"] for c in data["columns"]]
    for expected in ("triage", "todo", "ready", "running", "blocked", "done"):
        assert expected in names, f"missing column {expected}: {names}"
    assert all(len(c["tasks"]) == 0 for c in data["columns"])
    assert data["tenants"] == []
    assert data["assignees"] == []
    assert data["latest_event_id"] == 0


# ---------------------------------------------------------------------------
# POST /tasks then GET /board sees it
# ---------------------------------------------------------------------------


def test_create_task_appears_on_board(client):
    r = client.post(
        "/api/plugins/kanban/tasks",
        json={
            "title": "Research LLM caching",
            "assignee": "researcher",
            "priority": 3,
            "tenant": "acme",
        },
    )
    assert r.status_code == 200, r.text
    task = r.json()["task"]
    assert task["title"] == "Research LLM caching"
    assert task["assignee"] == "researcher"
    assert task["status"] == "ready"  # no parents -> immediately ready
    assert task["priority"] == 3
    assert task["tenant"] == "acme"
    task_id = task["id"]

    # Board now lists it under 'ready'.
    r = client.get("/api/plugins/kanban/board")
    assert r.status_code == 200
    data = r.json()
    ready = next(c for c in data["columns"] if c["name"] == "ready")
    assert len(ready["tasks"]) == 1
    assert ready["tasks"][0]["id"] == task_id
    assert "acme" in data["tenants"]
    assert "researcher" in data["assignees"]


def test_tenant_filter(client):
    client.post("/api/plugins/kanban/tasks", json={"title": "A", "tenant": "t1"})
    client.post("/api/plugins/kanban/tasks", json={"title": "B", "tenant": "t2"})

    r = client.get("/api/plugins/kanban/board?tenant=t1")
    counts = {c["name"]: len(c["tasks"]) for c in r.json()["columns"]}
    total = sum(counts.values())
    assert total == 1

    r = client.get("/api/plugins/kanban/board?tenant=t2")
    total = sum(len(c["tasks"]) for c in r.json()["columns"])
    assert total == 1


# ---------------------------------------------------------------------------
# GET /tasks/:id returns body + comments + events + links
# ---------------------------------------------------------------------------


def test_task_detail_includes_links_and_events(client):
    parent = client.post(
        "/api/plugins/kanban/tasks", json={"title": "parent"},
    ).json()["task"]
    child = client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "child", "parents": [parent["id"]]},
    ).json()["task"]
    assert child["status"] == "todo"  # parent not done yet

    # Detail for the child shows the parent link.
    r = client.get(f"/api/plugins/kanban/tasks/{child['id']}")
    assert r.status_code == 200
    data = r.json()
    assert data["task"]["id"] == child["id"]
    assert parent["id"] in data["links"]["parents"]

    # Detail for the parent shows the child.
    r = client.get(f"/api/plugins/kanban/tasks/{parent['id']}")
    assert child["id"] in r.json()["links"]["children"]

    # Events exist from creation.
    assert len(data["events"]) >= 1


def test_task_detail_404_on_unknown(client):
    r = client.get("/api/plugins/kanban/tasks/does-not-exist")
    assert r.status_code == 404


# ---------------------------------------------------------------------------
# PATCH /tasks/:id — status transitions
# ---------------------------------------------------------------------------


def test_patch_status_complete(client):
    t = client.post("/api/plugins/kanban/tasks", json={"title": "x"}).json()["task"]
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}",
        json={"status": "done", "result": "shipped"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["status"] == "done"

    # Board reflects the move.
    done = next(
        c for c in client.get("/api/plugins/kanban/board").json()["columns"]
        if c["name"] == "done"
    )
    assert any(x["id"] == t["id"] for x in done["tasks"])


def test_patch_block_then_unblock(client):
    t = client.post("/api/plugins/kanban/tasks", json={"title": "x"}).json()["task"]
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}",
        json={"status": "blocked", "block_reason": "need input"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["status"] == "blocked"

    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}",
        json={"status": "ready"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["status"] == "ready"


def test_patch_drag_drop_move_todo_to_ready(client):
    """Direct status write: the drag-drop path for statuses without a
    dedicated verb (e.g. manually promoting todo -> ready)."""
    parent = client.post("/api/plugins/kanban/tasks", json={"title": "p"}).json()["task"]
    child = client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "c", "parents": [parent["id"]]},
    ).json()["task"]
    assert child["status"] == "todo"

    r = client.patch(
        f"/api/plugins/kanban/tasks/{child['id']}",
        json={"status": "ready"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["status"] == "ready"


def test_patch_reassign(client):
    t = client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "x", "assignee": "a"},
    ).json()["task"]
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}",
        json={"assignee": "b"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["assignee"] == "b"


def test_patch_priority_and_edit(client):
    t = client.post("/api/plugins/kanban/tasks", json={"title": "x"}).json()["task"]
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}",
        json={"priority": 5, "title": "renamed"},
    )
    assert r.status_code == 200
    data = r.json()["task"]
    assert data["priority"] == 5
    assert data["title"] == "renamed"


def test_patch_invalid_status(client):
    t = client.post("/api/plugins/kanban/tasks", json={"title": "x"}).json()["task"]
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}",
        json={"status": "banana"},
    )
    assert r.status_code == 400


# ---------------------------------------------------------------------------
# Comments + Links
# ---------------------------------------------------------------------------


def test_add_comment(client):
    t = client.post("/api/plugins/kanban/tasks", json={"title": "x"}).json()["task"]
    r = client.post(
        f"/api/plugins/kanban/tasks/{t['id']}/comments",
        json={"body": "how's progress?", "author": "teknium"},
    )
    assert r.status_code == 200

    r = client.get(f"/api/plugins/kanban/tasks/{t['id']}")
    comments = r.json()["comments"]
    assert len(comments) == 1
    assert comments[0]["body"] == "how's progress?"
    assert comments[0]["author"] == "teknium"


def test_add_comment_empty_rejected(client):
    t = client.post("/api/plugins/kanban/tasks", json={"title": "x"}).json()["task"]
    r = client.post(
        f"/api/plugins/kanban/tasks/{t['id']}/comments",
        json={"body": "   "},
    )
    assert r.status_code == 400


def test_add_link_and_delete_link(client):
    a = client.post("/api/plugins/kanban/tasks", json={"title": "a"}).json()["task"]
    b = client.post("/api/plugins/kanban/tasks", json={"title": "b"}).json()["task"]

    r = client.post(
        "/api/plugins/kanban/links",
        json={"parent_id": a["id"], "child_id": b["id"]},
    )
    assert r.status_code == 200

    r = client.get(f"/api/plugins/kanban/tasks/{b['id']}")
    assert a["id"] in r.json()["links"]["parents"]

    r = client.delete(
        "/api/plugins/kanban/links",
        params={"parent_id": a["id"], "child_id": b["id"]},
    )
    assert r.status_code == 200
    assert r.json()["ok"] is True


def test_add_link_cycle_rejected(client):
    a = client.post("/api/plugins/kanban/tasks", json={"title": "a"}).json()["task"]
    b = client.post("/api/plugins/kanban/tasks", json={"title": "b"}).json()["task"]
    client.post(
        "/api/plugins/kanban/links",
        json={"parent_id": a["id"], "child_id": b["id"]},
    )
    r = client.post(
        "/api/plugins/kanban/links",
        json={"parent_id": b["id"], "child_id": a["id"]},
    )
    assert r.status_code == 400


# ---------------------------------------------------------------------------
# Dispatch nudge
# ---------------------------------------------------------------------------


def test_dispatch_dry_run(client):
    client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "work", "assignee": "researcher"},
    )
    r = client.post("/api/plugins/kanban/dispatch?dry_run=true&max=4")
    assert r.status_code == 200
    body = r.json()
    # DispatchResult is serialized as a dataclass dict.
    assert isinstance(body, dict)


# ---------------------------------------------------------------------------
# Triage column (new v1 status)
# ---------------------------------------------------------------------------


def test_create_triage_lands_in_triage_column(client):
    r = client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "rough idea, spec me", "triage": True},
    )
    assert r.status_code == 200
    task = r.json()["task"]
    assert task["status"] == "triage"

    r = client.get("/api/plugins/kanban/board")
    triage = next(c for c in r.json()["columns"] if c["name"] == "triage")
    assert len(triage["tasks"]) == 1
    assert triage["tasks"][0]["title"] == "rough idea, spec me"


def test_triage_task_not_promoted_to_ready(client):
    """Triage tasks must stay in triage even when they have no parents."""
    client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "must stay put", "triage": True},
    )
    # Run the dispatcher — it should NOT promote the triage task.
    client.post("/api/plugins/kanban/dispatch?dry_run=false&max=4")
    r = client.get("/api/plugins/kanban/board")
    triage = next(c for c in r.json()["columns"] if c["name"] == "triage")
    ready = next(c for c in r.json()["columns"] if c["name"] == "ready")
    assert len(triage["tasks"]) == 1
    assert len(ready["tasks"]) == 0


def test_patch_status_triage_works(client):
    """A user (or specifier) can push a task back into triage, and out of it."""
    t = client.post(
        "/api/plugins/kanban/tasks", json={"title": "x"},
    ).json()["task"]
    # Normal creation is 'ready'; push to triage.
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}", json={"status": "triage"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["status"] == "triage"

    # Now promote to todo.
    r = client.patch(
        f"/api/plugins/kanban/tasks/{t['id']}", json={"status": "todo"},
    )
    assert r.status_code == 200
    assert r.json()["task"]["status"] == "todo"


# ---------------------------------------------------------------------------
# Progress rollup (done children / total children)
# ---------------------------------------------------------------------------


def test_board_progress_rollup(client):
    parent = client.post(
        "/api/plugins/kanban/tasks", json={"title": "parent"},
    ).json()["task"]
    child_a = client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "a", "parents": [parent["id"]]},
    ).json()["task"]
    child_b = client.post(
        "/api/plugins/kanban/tasks",
        json={"title": "b", "parents": [parent["id"]]},
    ).json()["task"]
    # Children start as "todo" because the parent isn't done yet; promote
    # them to "ready" so complete_task will accept the transition.
    for cid in (child_a["id"], child_b["id"]):
        r = client.patch(
            f"/api/plugins/kanban/tasks/{cid}", json={"status": "ready"},
        )
        assert r.status_code == 200

    # 0/2 done.
    r = client.get("/api/plugins/kanban/board")
    parent_row = next(
        t for col in r.json()["columns"] for t in col["tasks"]
        if t["id"] == parent["id"]
    )
    assert parent_row["progress"] == {"done": 0, "total": 2}

    # Complete one child. 1/2.
    r = client.patch(
        f"/api/plugins/kanban/tasks/{child_a['id']}",
        json={"status": "done"},
    )
    assert r.status_code == 200
    r = client.get("/api/plugins/kanban/board")
    parent_row = next(
        t for col in r.json()["columns"] for t in col["tasks"]
        if t["id"] == parent["id"]
    )
    assert parent_row["progress"] == {"done": 1, "total": 2}

    # Childless tasks report progress=None, not {0/0}.
    assert next(
        t for col in r.json()["columns"] for t in col["tasks"]
        if t["id"] == child_b["id"]
    )["progress"] is None


# ---------------------------------------------------------------------------
# Auto-init on first board read
# ---------------------------------------------------------------------------


def test_board_auto_initializes_missing_db(tmp_path, monkeypatch):
    """If kanban.db doesn't exist yet, GET /board must create it, not 500."""
    home = tmp_path / ".hermes"
    home.mkdir()
    monkeypatch.setenv("HERMES_HOME", str(home))
    monkeypatch.setattr(Path, "home", lambda: tmp_path)
    # Deliberately DO NOT call kb.init_db().

    app = FastAPI()
    app.include_router(_load_plugin_router(), prefix="/api/plugins/kanban")
    c = TestClient(app)
    r = c.get("/api/plugins/kanban/board")
    assert r.status_code == 200
    assert (home / "kanban.db").exists(), "init_db wasn't invoked by /board"


# ---------------------------------------------------------------------------
# WebSocket auth (query-param token)
# ---------------------------------------------------------------------------


def test_ws_events_rejects_when_token_required(tmp_path, monkeypatch):
    """When _SESSION_TOKEN is set (normal dashboard context), a missing or
    wrong ?token= query param must be rejected with policy-violation."""
    home = tmp_path / ".hermes"
    home.mkdir()
    monkeypatch.setenv("HERMES_HOME", str(home))
    monkeypatch.setattr(Path, "home", lambda: tmp_path)
    kb.init_db()

    # Stub web_server so _check_ws_token has a token to compare against.
    import types
    stub = types.SimpleNamespace(_SESSION_TOKEN="secret-xyz")
    monkeypatch.setitem(sys.modules, "hermes_cli.web_server", stub)

    app = FastAPI()
    app.include_router(_load_plugin_router(), prefix="/api/plugins/kanban")
    c = TestClient(app)

    # No token → policy violation close.
    from starlette.websockets import WebSocketDisconnect
    with pytest.raises(WebSocketDisconnect) as exc:
        with c.websocket_connect("/api/plugins/kanban/events"):
            pass
    assert exc.value.code == 1008

    # Wrong token → policy violation close.
    with pytest.raises(WebSocketDisconnect) as exc:
        with c.websocket_connect("/api/plugins/kanban/events?token=nope"):
            pass
    assert exc.value.code == 1008

    # Correct token → accepted (connect then close cleanly from our side).
    with c.websocket_connect(
        "/api/plugins/kanban/events?token=secret-xyz"
    ) as ws:
        assert ws is not None  # handshake succeeded


# ---------------------------------------------------------------------------
# Bulk actions
# ---------------------------------------------------------------------------


def test_bulk_status_ready(client):
    a = client.post("/api/plugins/kanban/tasks", json={"title": "a"}).json()["task"]
    b = client.post("/api/plugins/kanban/tasks", json={"title": "b"}).json()["task"]
    c2 = client.post("/api/plugins/kanban/tasks", json={"title": "c"}).json()["task"]
    # Parent-less tasks land in "ready" already; push them to blocked first.
    for tid in (a["id"], b["id"], c2["id"]):
        client.patch(f"/api/plugins/kanban/tasks/{tid}",
                     json={"status": "blocked", "block_reason": "wait"})

    r = client.post("/api/plugins/kanban/tasks/bulk",
                    json={"ids": [a["id"], b["id"], c2["id"]], "status": "ready"})
    assert r.status_code == 200
    results = r.json()["results"]
    assert all(r["ok"] for r in results)
    # All three are now ready.
    board = client.get("/api/plugins/kanban/board").json()
    ready = next(col for col in board["columns"] if col["name"] == "ready")
    ids = {t["id"] for t in ready["tasks"]}
    assert {a["id"], b["id"], c2["id"]}.issubset(ids)


def test_bulk_archive(client):
    a = client.post("/api/plugins/kanban/tasks", json={"title": "a"}).json()["task"]
    b = client.post("/api/plugins/kanban/tasks", json={"title": "b"}).json()["task"]
    r = client.post("/api/plugins/kanban/tasks/bulk",
                    json={"ids": [a["id"], b["id"]], "archive": True})
    assert r.status_code == 200
    assert all(r["ok"] for r in r.json()["results"])
    # Default board (archived hidden) — both gone.
    board = client.get("/api/plugins/kanban/board").json()
    ids = {t["id"] for col in board["columns"] for t in col["tasks"]}
    assert a["id"] not in ids
    assert b["id"] not in ids


def test_bulk_reassign(client):
    a = client.post("/api/plugins/kanban/tasks",
                    json={"title": "a", "assignee": "old"}).json()["task"]
    b = client.post("/api/plugins/kanban/tasks",
                    json={"title": "b", "assignee": "old"}).json()["task"]
    r = client.post("/api/plugins/kanban/tasks/bulk",
                    json={"ids": [a["id"], b["id"]], "assignee": "new"})
    assert r.status_code == 200
    for tid in (a["id"], b["id"]):
        t = client.get(f"/api/plugins/kanban/tasks/{tid}").json()["task"]
        assert t["assignee"] == "new"


def test_bulk_unassign_via_empty_string(client):
    a = client.post("/api/plugins/kanban/tasks",
                    json={"title": "a", "assignee": "x"}).json()["task"]
    r = client.post("/api/plugins/kanban/tasks/bulk",
                    json={"ids": [a["id"]], "assignee": ""})
    assert r.status_code == 200
    t = client.get(f"/api/plugins/kanban/tasks/{a['id']}").json()["task"]
    assert t["assignee"] is None


def test_bulk_partial_failure_doesnt_abort_siblings(client):
    """One bad id in the middle of a batch must not prevent others from
    applying."""
    a = client.post("/api/plugins/kanban/tasks", json={"title": "a"}).json()["task"]
    c2 = client.post("/api/plugins/kanban/tasks", json={"title": "c"}).json()["task"]
    r = client.post("/api/plugins/kanban/tasks/bulk",
                    json={"ids": [a["id"], "bogus-id", c2["id"]], "priority": 7})
    assert r.status_code == 200
    results = r.json()["results"]
    assert len(results) == 3
    ok_ids = {r["id"] for r in results if r["ok"]}
    assert a["id"] in ok_ids
    assert c2["id"] in ok_ids
    assert any(not r["ok"] and r["id"] == "bogus-id" for r in results)
    # Good siblings actually got the priority bump.
    for tid in (a["id"], c2["id"]):
        t = client.get(f"/api/plugins/kanban/tasks/{tid}").json()["task"]
        assert t["priority"] == 7


def test_bulk_empty_ids_400(client):
    r = client.post("/api/plugins/kanban/tasks/bulk", json={"ids": []})
    assert r.status_code == 400


# ---------------------------------------------------------------------------
# /config endpoint
# ---------------------------------------------------------------------------


def test_config_returns_defaults_when_section_missing(client):
    r = client.get("/api/plugins/kanban/config")
    assert r.status_code == 200
    data = r.json()
    # Defaults when dashboard.kanban is missing.
    assert data["default_tenant"] == ""
    assert data["lane_by_profile"] is True
    assert data["include_archived_by_default"] is False
    assert data["render_markdown"] is True


def test_config_reads_dashboard_kanban_section(tmp_path, monkeypatch, client):
    home = Path(os.environ["HERMES_HOME"])
    (home / "config.yaml").write_text(
        "dashboard:\n"
        "  kanban:\n"
        "    default_tenant: acme\n"
        "    lane_by_profile: false\n"
        "    include_archived_by_default: true\n"
        "    render_markdown: false\n"
    )
    r = client.get("/api/plugins/kanban/config")
    assert r.status_code == 200
    data = r.json()
    assert data["default_tenant"] == "acme"
    assert data["lane_by_profile"] is False
    assert data["include_archived_by_default"] is True
    assert data["render_markdown"] is False