"""L1: `tht cte next` — the first plan CTE not yet approved (drives the F6 gate)."""
import json

from typer.testing import CliRunner

from tht.cli.cte_cmd import cte_app
from tht.config import DatabaseConfig
from tht.decisions import append_decision
from tht.session.store import create_session


def _db():
    return DatabaseConfig(database="testdb", user="u", password="p", **{"schema": "public"})  # noqa: S106


def _patch_cfg(monkeypatch, tmp_path):
    from tht.cli import cte_cmd

    class FakePaths:
        sessions = tmp_path

    class FakeCfg:
        paths = FakePaths()
        database = _db()

    monkeypatch.setattr(cte_cmd, "_load_config_or_exit", lambda _: FakeCfg())


def test_cte_next_first_unapproved(tmp_path, monkeypatch):
    m = create_session("q", _db(), tmp_path)
    (tmp_path / m.id / "cte_plan.json").write_text(json.dumps(["a", "b", "c"]))
    _patch_cfg(monkeypatch, tmp_path)
    res = CliRunner().invoke(cte_app, ["next", "--session", m.id])
    assert res.exit_code == 0, res.output
    assert res.output.strip() == "a"


def test_cte_next_after_one_approval(tmp_path, monkeypatch):
    m = create_session("q", _db(), tmp_path)
    (tmp_path / m.id / "cte_plan.json").write_text(json.dumps(["a", "b", "c"]))
    append_decision(tmp_path / m.id, type="cte_approved", subject="a")
    _patch_cfg(monkeypatch, tmp_path)
    res = CliRunner().invoke(cte_app, ["next", "--session", m.id])
    assert res.exit_code == 0, res.output
    assert res.output.strip() == "b"


def test_cte_next_empty_when_all_approved(tmp_path, monkeypatch):
    m = create_session("q", _db(), tmp_path)
    (tmp_path / m.id / "cte_plan.json").write_text(json.dumps(["a"]))
    append_decision(tmp_path / m.id, type="cte_approved", subject="a")
    _patch_cfg(monkeypatch, tmp_path)
    res = CliRunner().invoke(cte_app, ["next", "--session", m.id])
    assert res.exit_code == 0, res.output
    assert res.output.strip() == ""