"""Tests for the kanban `promote` verb (issue #28822).

The realistic bug scenario from #28822 is: a child task ends up in
``todo`` with all its parents already ``done`` (because the
auto-promote daemon hasn't run, or a manual close raced it).
Direct-SQL setup is used to construct that state deterministically.
"""

from __future__ import annotations

import argparse
import json
from pathlib import Path

import pytest

from hermes_cli import kanban as kb_cli
from hermes_cli import kanban_db as kb


@pytest.fixture
def kanban_home(tmp_path, monkeypatch):
    home = tmp_path / ".hermes"
    home.mkdir()
    monkeypatch.setenv("HERMES_HOME", str(home))
    monkeypatch.setattr(Path, "home", lambda: tmp_path)
    db_path = kb.kanban_db_path(board="default")
    kb._INITIALIZED_PATHS.discard(str(db_path.resolve()))
    kb.init_db()
    return home


@pytest.fixture
def conn(kanban_home):
    with kb.connect() as c:
        yield c


def _stuck_todo(conn, *, parents_done=True, n_parents=1):
    """Build the #28822 scenario: child in 'todo' whose parents may
    have closed as 'done' without the auto-promote logic firing.
    """
    parent_ids = [
        kb.create_task(conn, title=f"parent{i}", assignee="setup")
        for i in range(n_parents)
    ]
    child_id = kb.create_task(
        conn, title="child", parents=parent_ids, assignee="setup"
    )
    assert kb.get_task(conn, child_id).status == "todo"
    if parents_done:
        for pid in parent_ids:
            conn.execute(
                "UPDATE tasks SET status='done' WHERE id=?", (pid,)
            )
    return child_id, parent_ids


def test_promote_stuck_todo_succeeds(conn):
    child, _ = _stuck_todo(conn, parents_done=True)
    ok, err = kb.promote_task(conn, child, actor="tester")
    assert ok and err is None
    assert kb.get_task(conn, child).status == "ready"


def test_promote_refuses_when_parent_not_done(conn):
    child, parents = _stuck_todo(conn, parents_done=False)
    ok, err = kb.promote_task(conn, child, actor="tester")
    assert ok is False
    assert err is not None and "unsatisfied parent dependencies" in err
    assert parents[0] in err
    assert kb.get_task(conn, child).status == "todo"


def test_promote_with_force_bypasses_dependency_check(conn):
    child, _ = _stuck_todo(conn, parents_done=False)
    ok, err = kb.promote_task(
        conn, child, actor="tester", reason="recovery", force=True
    )
    assert ok and err is None
    assert kb.get_task(conn, child).status == "ready"


def test_promote_emits_audit_event(conn):
    child, _ = _stuck_todo(conn, parents_done=True)
    kb.promote_task(conn, child, actor="tester", reason="manual recovery")
    ev = conn.execute(
        "SELECT kind, payload FROM task_events "
        "WHERE task_id = ? AND kind = 'promoted_manual'",
        (child,),
    ).fetchone()
    assert ev is not None
    payload = json.loads(ev["payload"])
    assert payload["actor"] == "tester"
    assert payload["reason"] == "manual recovery"
    assert payload["forced"] is False


def test_promote_force_records_forced_flag(conn):
    child, _ = _stuck_todo(conn, parents_done=False)
    kb.promote_task(conn, child, actor="tester", force=True, reason="r")
    ev = conn.execute(
        "SELECT payload FROM task_events "
        "WHERE task_id = ? AND kind = 'promoted_manual'",
        (child,),
    ).fetchone()
    assert json.loads(ev["payload"])["forced"] is True


def test_promote_does_not_change_assignee(conn):
    child, _ = _stuck_todo(conn, parents_done=True)
    before = kb.get_task(conn, child).assignee
    kb.promote_task(conn, child, actor="someone_else")
    after = kb.get_task(conn, child).assignee
    assert before == after


def test_promote_dry_run_does_not_mutate(conn):
    child, _ = _stuck_todo(conn, parents_done=True)
    ok, err = kb.promote_task(conn, child, actor="tester", dry_run=True)
    assert ok and err is None
    assert kb.get_task(conn, child).status == "todo"
    n = conn.execute(
        "SELECT COUNT(*) AS n FROM task_events "
        "WHERE task_id = ? AND kind = 'promoted_manual'",
        (child,),
    ).fetchone()["n"]
    assert n == 0


def test_promote_dry_run_reports_dependency_failure(conn):
    child, _ = _stuck_todo(conn, parents_done=False)
    ok, err = kb.promote_task(conn, child, actor="tester", dry_run=True)
    assert ok is False
    assert err is not None and "unsatisfied" in err


def test_promote_rejects_non_todo_status(conn):
    tid = kb.create_task(conn, title="standalone")
    assert kb.get_task(conn, tid).status == "ready"
    ok, err = kb.promote_task(conn, tid, actor="tester")
    assert ok is False
    assert "'ready'" in err and "promote only applies" in err


def test_promote_rejects_unknown_task(conn):
    ok, err = kb.promote_task(conn, "t_doesnotexist", actor="tester")
    assert ok is False
    assert err is not None and "not found" in err


def test_promote_blocked_task_works(conn):
    tid = kb.create_task(conn, title="t")
    conn.execute("UPDATE tasks SET status='blocked' WHERE id=?", (tid,))
    ok, err = kb.promote_task(
        conn, tid, actor="tester", reason="ready now"
    )
    assert ok and err is None
    assert kb.get_task(conn, tid).status == "ready"


# ---------------------------------------------------------------------------
# CLI `_cmd_promote` — bulk via `--ids` (the issue's anti-respawn use case:
# promote all children of a closed parent in one command).
# ---------------------------------------------------------------------------


def _promote_ns(task_id, *, ids=None, reason=None, force=False,
                dry_run=False, as_json=False):
    return argparse.Namespace(
        task_id=task_id,
        reason=list(reason or []),
        ids=list(ids or []) or None,
        force=force,
        dry_run=dry_run,
        json=as_json,
    )


def test_cli_promote_bulk_ids_promotes_all(kanban_home, capsys):
    with kb.connect() as conn:
        parent = kb.create_task(conn, title="parent")
        children = [
            kb.create_task(conn, title=f"c{i}", parents=[parent])
            for i in range(3)
        ]
        conn.execute("UPDATE tasks SET status='done' WHERE id=?", (parent,))
    rc = kb_cli._cmd_promote(_promote_ns(children[0], ids=children[1:]))
    assert rc == 0
    out = capsys.readouterr().out
    for c in children:
        assert c in out
    with kb.connect() as conn:
        for c in children:
            assert kb.get_task(conn, c).status == "ready"


def test_cli_promote_bulk_partial_failure_exits_1(kanban_home, capsys):
    """Bulk with one bad id: good ones still promote, exit code reflects failure."""
    with kb.connect() as conn:
        parent = kb.create_task(conn, title="parent")
        good = kb.create_task(conn, title="good", parents=[parent])
        conn.execute("UPDATE tasks SET status='done' WHERE id=?", (parent,))
    rc = kb_cli._cmd_promote(_promote_ns(good, ids=["t_nope"]))
    assert rc == 1
    captured = capsys.readouterr()
    assert good in captured.out  # good one promoted
    assert "t_nope" in captured.err and "not found" in captured.err
    with kb.connect() as conn:
        assert kb.get_task(conn, good).status == "ready"


def test_cli_promote_bulk_json_emits_list(kanban_home, capsys):
    with kb.connect() as conn:
        parent = kb.create_task(conn, title="parent")
        a = kb.create_task(conn, title="a", parents=[parent])
        b = kb.create_task(conn, title="b", parents=[parent])
        conn.execute("UPDATE tasks SET status='done' WHERE id=?", (parent,))
    rc = kb_cli._cmd_promote(_promote_ns(a, ids=[b], as_json=True))
    assert rc == 0
    payload = json.loads(capsys.readouterr().out)
    assert isinstance(payload, list) and len(payload) == 2
    assert {r["task_id"] for r in payload} == {a, b}
    assert all(r["promoted"] for r in payload)


def test_cli_promote_single_json_stays_flat_object(kanban_home, capsys):
    """Back-compat: single-id JSON is still a flat object, not a list."""
    with kb.connect() as conn:
        parent = kb.create_task(conn, title="parent")
        child = kb.create_task(conn, title="c", parents=[parent])
        conn.execute("UPDATE tasks SET status='done' WHERE id=?", (parent,))
    rc = kb_cli._cmd_promote(_promote_ns(child, as_json=True))
    assert rc == 0
    payload = json.loads(capsys.readouterr().out)
    assert isinstance(payload, dict)
    assert payload["task_id"] == child and payload["promoted"] is True


def test_cli_promote_dedupes_duplicate_ids(kanban_home, capsys):
    """Same id in positional + --ids must only attempt the promotion once."""
    with kb.connect() as conn:
        parent = kb.create_task(conn, title="parent")
        child = kb.create_task(conn, title="c", parents=[parent])
        conn.execute("UPDATE tasks SET status='done' WHERE id=?", (parent,))
    rc = kb_cli._cmd_promote(_promote_ns(child, ids=[child, child]))
    assert rc == 0
    with kb.connect() as conn:
        n = conn.execute(
            "SELECT COUNT(*) AS n FROM task_events "
            "WHERE task_id = ? AND kind = 'promoted_manual'",
            (child,),
        ).fetchone()["n"]
    assert n == 1