"""Issue #60: opencode 2.x.

Measured on opencode 2.0.32 (macOS): the TUI rejects `--agent`, the database
keeps sessions in session_v2 (a fresh 2.x database has no `session` table; a
migrated one keeps the 1.x tables but no longer writes them), `db path` is
gone (`debug paths` prints the db), and `session delete` removes a session
with its child sessions from the 2.x tables only.

The unit tests use the fake opencode of tests/_fake_opencode.py. The last
test runs a real opencode 2.x, when one is installed, in a home and tmp dir
of its own with --standalone (no background service is started or reached).
"""
from __future__ import annotations

import os
import re
import shutil
import sqlite3
import subprocess
import sys
import time
from pathlib import Path

import pytest

REPO_ROOT = Path(__file__).resolve().parent.parent
SKILLS = REPO_ROOT / ".agents" / "skills"
sys.path.insert(0, str(SKILLS))
from lib_py.agents.registry import get_adapter  # noqa: E402
from lib_py.agents.base import DiscoveryContext  # noqa: E402
import _fake_opencode  # noqa: E402

V2_DDL = ("CREATE TABLE session_v2 (id TEXT PRIMARY KEY, parent_id TEXT, directory TEXT NOT NULL, time_created INTEGER NOT NULL)",
          "CREATE TABLE session_message (id TEXT PRIMARY KEY, session_id TEXT)",
          "CREATE TABLE event_sequence (aggregate_id TEXT PRIMARY KEY, seq INTEGER)")


@pytest.fixture
def oc(tmp_path, monkeypatch):
    """The opencode adapter on a home of its own, with a fake opencode that
    logs every call."""
    home = tmp_path / "home"
    ws = tmp_path / "ws"
    ws.mkdir(parents=True)
    log = tmp_path / "calls.log"
    fake = _fake_opencode.write(tmp_path / "fakebin" / "opencode-real")
    wrapper = tmp_path / "fakebin" / "opencode"
    wrapper.write_text(f'#!/bin/sh\necho "$*" >> "{log}"\nexec "{fake}" "$@"\n')
    wrapper.chmod(0o755)
    adapter = get_adapter("opencode")
    monkeypatch.setattr(adapter, "_bin", lambda ctx: str(wrapper))
    ctx = DiscoveryContext(workspace=str(ws), agent_name="opencode", home_dir=str(home))
    db = home / ".local" / "share" / "opencode" / "opencode.db"
    db.parent.mkdir(parents=True)
    conn = sqlite3.connect(str(db))
    for stmt in V2_DDL:
        conn.execute(stmt)
    conn.commit()
    conn.close()

    def calls():
        return log.read_text().splitlines() if log.exists() else []

    return adapter, ctx, db, ws, calls


def _add(db, sid, ws, ms, parent=None):
    conn = sqlite3.connect(str(db))
    conn.execute("INSERT INTO session_v2 VALUES (?, ?, ?, ?)", (sid, parent, str(ws), ms))
    conn.execute("INSERT INTO session_message VALUES (?, ?)", (f"msg-{sid}", sid))
    conn.execute("INSERT INTO event_sequence VALUES (?, 1)", (sid,))
    conn.commit()
    conn.close()


def _rows(db, sid):
    conn = sqlite3.connect(str(db))
    try:
        return (conn.execute("SELECT count(*) FROM session_v2 WHERE id=?", (sid,)).fetchone()[0]
                + conn.execute("SELECT count(*) FROM session_message WHERE session_id=?", (sid,)).fetchone()[0]
                + conn.execute("SELECT count(*) FROM event_sequence WHERE aggregate_id=?", (sid,)).fetchone()[0])
    finally:
        conn.close()


def test_the_db_comes_from_debug_paths(oc):
    adapter, ctx, db, ws, calls = oc
    assert adapter._resolve_db(ctx) == str(db)
    assert calls() == ["debug paths"]


def test_discover_and_verify_read_session_v2_and_skip_child_sessions(oc):
    adapter, ctx, db, ws, calls = oc
    _add(db, "ses_main", ws, 2_000_000)
    _add(db, "ses_child", ws, 3_000_000, parent="ses_main")   # a subagent's session: newer, same dir
    _add(db, "ses_old", ws, 500_000)
    ctx.epoch = 1000
    assert adapter.discover(ctx) == ["ses_main"]
    assert adapter.verify_artifact("ses_main", ctx) is True
    assert adapter.verify_artifact("ses_old", ctx) is False


def test_a_fresh_2x_database_has_no_session_table_and_still_works(oc):
    adapter, ctx, db, ws, calls = oc
    _add(db, "ses_main", ws, 2_000_000)
    conn = sqlite3.connect(str(db))
    assert conn.execute("SELECT count(*) FROM sqlite_master WHERE name='session'").fetchone()[0] == 0
    conn.close()
    assert adapter.discover(ctx) == ["ses_main"]


def test_purge_asks_opencode_to_delete_the_session_and_its_children(oc):
    adapter, ctx, db, ws, calls = oc
    _add(db, "ses_main", ws, 2_000_000)
    _add(db, "ses_child", ws, 3_000_000, parent="ses_main")
    _add(db, "ses_other", ws, 2_500_000)
    purged = adapter.purge_artifacts("ses_main", ctx)
    assert purged == ["opencode session (with its child sessions): ses_main"]  # no 1.x tables: nothing else
    assert "session delete --standalone -- ses_main" in calls()
    assert _rows(db, "ses_main") == 0 and _rows(db, "ses_child") == 0
    assert _rows(db, "ses_other") == 3
    assert adapter.residual_artifacts("ses_main", ctx) == []


def test_purge_does_not_run_opencode_for_a_session_it_does_not_hold(oc):
    adapter, ctx, db, ws, calls = oc
    assert adapter.purge_artifacts("ses_missing", ctx) == []
    assert not any(c.startswith("session delete") for c in calls())


@pytest.mark.parametrize("broken", ["exit", "missing"])
def test_a_failed_delete_is_warned_and_reported(oc, monkeypatch, capsys, broken):
    adapter, ctx, db, ws, calls = oc
    _add(db, "ses_main", ws, 2_000_000)
    if broken == "missing":
        monkeypatch.setattr(adapter, "_bin", lambda ctx: None)
        want = "no opencode binary"
    else:
        failing = Path(ctx.home_dir).parent / "fakebin" / "failing"
        failing.write_text('#!/bin/sh\n[ "$1" = debug ] && exec "$(dirname "$0")/opencode-real" "$@"\necho boom >&2\nexit 3\n')
        failing.chmod(0o755)
        monkeypatch.setattr(adapter, "_bin", lambda ctx: str(failing))
        want = "exited 3: boom"
    assert adapter.purge_artifacts("ses_main", ctx) == []
    assert want in capsys.readouterr().err
    assert f"{adapter._resolve_db(ctx)} (session_v2.id: 1 rows)" in adapter.residual_artifacts("ses_main", ctx)


def test_purge_takes_the_1x_rows_of_the_child_sessions_too(oc):
    """A migrated database: the child sessions opencode deletes with their
    parent keep 1.x rows that only the purge removes (review 614b6263)."""
    adapter, ctx, db, ws, calls = oc
    conn = sqlite3.connect(str(db))
    conn.execute("CREATE TABLE session (id TEXT PRIMARY KEY, parent_id TEXT)")
    conn.execute("CREATE TABLE message (id TEXT PRIMARY KEY, session_id TEXT)")
    conn.execute("CREATE TABLE todo (id TEXT, session_id TEXT)")
    conn.commit()
    conn.close()
    tree = [("ses_main", None), ("ses_child", "ses_main"), ("ses_grand", "ses_child"), ("ses_other", None)]
    for sid, parent in tree:
        _add(db, sid, ws, 2_000_000, parent=parent)
        conn = sqlite3.connect(str(db))
        conn.execute("INSERT INTO session VALUES (?, ?)", (sid, parent))
        conn.execute("INSERT INTO message VALUES (?, ?)", (f"m-{sid}", sid))
        conn.execute("INSERT INTO todo VALUES ('t', ?)", (sid,))
        conn.commit()
        conn.close()

    assert any(r.endswith("[child session ses_grand]") for r in adapter.residual_artifacts("ses_main", ctx))
    purged = adapter.purge_artifacts("ses_main", ctx)
    assert purged == ["opencode session (with its child sessions): ses_main",
                      "sqlite rows for session: ses_main and 2 child session(s)"]
    for sid in ("ses_main", "ses_child", "ses_grand"):
        assert adapter.residual_artifacts(sid, ctx) == [], sid
    # the unrelated session is untouched: session_v2, session_message, event_sequence, session, message, todo
    assert len(adapter.residual_artifacts("ses_other", ctx)) == 6


def test_a_failed_delete_reports_the_child_sessions_left(oc, monkeypatch):
    adapter, ctx, db, ws, calls = oc
    _add(db, "ses_main", ws, 2_000_000)
    _add(db, "ses_child", ws, 2_000_000, parent="ses_main")
    monkeypatch.setattr(adapter, "_bin", lambda ctx: None)
    adapter.purge_artifacts("ses_main", ctx)
    residual = adapter.residual_artifacts("ses_main", ctx)
    assert f"{db} (session_v2.id: 1 rows) [child session ses_child]" in residual
    assert f"{db} (session_v2.id: 1 rows)" in residual


def _holder(tmp_path, db, *argv):
    """A live process holding `db` open, with `argv` on its command line."""
    ready = tmp_path / f"ready-{len(argv)}"
    code = ("import sys, time; f = open(sys.argv[1]); open(sys.argv[2], 'w').close(); time.sleep(60)")
    p = subprocess.Popen([sys.executable, "-c", code, str(db), str(ready), *argv])
    for _ in range(100):
        if ready.exists():
            break
        time.sleep(0.05)
    return p


@pytest.mark.skipif(shutil.which("lsof") is None, reason="no lsof")
def test_the_background_service_alone_does_not_hold_a_session(oc, tmp_path):
    """The per-user service keeps the shared database open for every session
    (2.x); MAM runs none of its sessions there."""
    adapter, ctx, db, ws, calls = oc
    _add(db, "ses_main", ws, 2_000_000)
    assert adapter.conversation_in_use("ses_main", ctx) is False
    service = _holder(tmp_path, db, "serve", "--service")
    try:
        assert adapter.conversation_in_use("ses_main", ctx) is False
        other = _holder(tmp_path, db, "--auto", "--standalone")   # another session's TUI or its server
        try:
            assert adapter.conversation_in_use("ses_main", ctx) is True
        finally:
            other.kill()
            other.wait()
    finally:
        service.kill()
        service.wait()
    named = subprocess.Popen([sys.executable, "-c", "import time; time.sleep(60)", "--session", "ses_main"])
    try:
        time.sleep(0.2)
        assert adapter.conversation_in_use("ses_main", ctx) is True
    finally:
        named.kill()
        named.wait()


def test_the_data_dir_follows_the_callers_xdg_data_home_only_for_its_own_home(tmp_path, monkeypatch):
    adapter = get_adapter("opencode")
    monkeypatch.setattr(adapter, "_bin", lambda ctx: None)
    own, other, xdg = tmp_path / "own", tmp_path / "other", tmp_path / "xdg"
    monkeypatch.setenv("HOME", str(own))
    monkeypatch.setenv("XDG_DATA_HOME", str(xdg))
    ws = str(tmp_path)
    assert adapter._resolve_db(DiscoveryContext(workspace=ws, agent_name="opencode", home_dir=str(own))) \
        == f"{xdg}/opencode/opencode.db"
    assert adapter._resolve_db(DiscoveryContext(workspace=ws, agent_name="opencode", home_dir=str(other))) \
        == f"{other}/.local/share/opencode/opencode.db"
    monkeypatch.delenv("XDG_DATA_HOME")
    assert adapter._resolve_db(DiscoveryContext(workspace=ws, agent_name="opencode", home_dir=str(own))) \
        == f"{own}/.local/share/opencode/opencode.db"


def test_the_standalone_server_is_a_resident_child_but_its_tools_are_work():
    """--standalone keeps `opencode serve --stdio` under the TUI while idle;
    the stall watcher skips it but still sees what runs under it."""
    from lib_py.stall_watch import background_children
    resident = get_adapter("opencode").resident_children
    tui = subprocess.Popen(["bash", "-c", "(exec -a opencode sleep 300) & exec sleep 300"], start_new_session=True)
    busy = subprocess.Popen(["bash", "-c", "(exec -a opencode bash -c 'sleep 300; :') & exec sleep 300"],
                            start_new_session=True)
    try:
        time.sleep(0.5)
        assert background_children(tui.pid, ()) != []
        assert background_children(tui.pid, resident) == []
        assert background_children(busy.pid, resident) != []
    finally:
        for p in (tui, busy):
            os.killpg(p.pid, 9)   # the whole group: children and grandchildren
            p.wait()


def test_spawn_and_resume_never_pass_agent_and_run_standalone():
    """The shell copies of the opencode command line match the adapter."""
    adapter = get_adapter("opencode")
    assert adapter.spawn_spec("opencode") == "opencode --auto --standalone"
    assert adapter.resume_spec("opencode", "ses_x", materialized=True) == "opencode --session ses_x --auto --standalone"
    for rel in ("multi-agent-mux-create/scripts/create_session.sh",
                "multi-agent-mux-resume/scripts/resume_session.sh",
                "multi-agent-mux-resume/scripts/update_yaml_resumed.sh"):
        text = (SKILLS / rel).read_text()
        lines = [l for l in text.splitlines() if "opencode" in l and "--auto" in l]
        assert lines, rel
        for l in lines:
            assert "--agent" not in l and "--standalone" in l, (rel, l)


def test_status_and_reconcile_read_session_v2():
    for rel in ("multi-agent-mux-status/scripts/status.sh", "multi-agent-mux-monitor/scripts/reconcile.sh"):
        text = (SKILLS / rel).read_text()
        assert not re.search(r"FROM session\b(?!_)|table_info\(session\)", text), rel
        assert "session_v2" in text, rel


# ---------------------------------------------------------------------------
# a real opencode 2.x, in a home of its own
# ---------------------------------------------------------------------------
def _real_opencode():
    path = shutil.which("opencode") or os.path.expanduser("~/.opencode/bin/opencode")
    if not os.path.isfile(path):
        return None
    try:
        out = subprocess.run([path, "--version"], capture_output=True, text=True, timeout=20).stdout
    except Exception:
        return None
    m = re.search(r"(\d+)\.\d+\.\d+", out)
    return path if m and int(m.group(1)) >= 2 else None


REAL = _real_opencode()


@pytest.mark.skipif(REAL is None, reason="no opencode 2.x installed")
def test_real_opencode_2x_contract(tmp_path, monkeypatch):
    home = tmp_path / "home"
    ws = tmp_path / "ws"
    for d in (home, ws, tmp_path / "tmp"):
        d.mkdir()
    ws_real = os.path.realpath(str(ws))
    monkeypatch.setenv("HOME", str(home))
    monkeypatch.setenv("TMPDIR", str(tmp_path / "tmp"))
    for k in ("XDG_DATA_HOME", "XDG_STATE_HOME", "XDG_CONFIG_HOME", "XDG_CACHE_HOME", "HOME_DIR"):
        monkeypatch.delenv(k, raising=False)
    env = {**os.environ, "TERM": "dumb"}

    def cli(*args, check=True):
        res = subprocess.run([REAL, *args], capture_output=True, text=True, timeout=120, cwd=ws_real, env=env)
        if check:
            assert res.returncode == 0, (args, res.stdout, res.stderr)
        return res

    help_text = cli("--help").stdout
    assert "--standalone" in help_text and "--session" in help_text
    assert not re.search(r"^\s*--agent\b", help_text, re.M), "the TUI takes --agent again: revisit spawn_spec"

    import json
    parent = json.loads(cli("api", "--standalone", "POST", "/api/session", "-d", '{"title":"mam test"}').stdout)["data"]["id"]
    child = json.loads(cli("api", "--standalone", "POST", "/api/session", "-d",
                           json.dumps({"title": "mam child", "parentID": parent})).stdout)["data"]["id"]

    adapter = get_adapter("opencode")
    # The binary was found with the real HOME; under the test's HOME only a
    # PATH entry would find it (review f4cedbae N1).
    monkeypatch.setattr(adapter, "_bin", lambda ctx: REAL)
    ctx = DiscoveryContext(workspace=ws_real, agent_name="opencode", home_dir=str(home))
    db = adapter._resolve_db(ctx)
    assert db == str(home / ".local" / "share" / "opencode" / "opencode.db")
    assert adapter.discover(ctx) == [parent]
    assert adapter.verify_artifact(child, ctx) is True

    purged = adapter.purge_artifacts(parent, ctx)
    assert purged == [f"opencode session (with its child sessions): {parent}"]
    assert adapter.residual_artifacts(parent, ctx) == []
    assert adapter.residual_artifacts(child, ctx) == []
    gone = cli("session", "delete", "--standalone", "--", parent, check=False)
    assert gone.returncode == 1 and "Session not found" in gone.stdout + gone.stderr