"""The backup tools' pure parts (#5836): when the next backup is due, what the
overview says about backups, how a check reads to an agent, and their roles.

Reading the history, starting one and the audit row run against Postgres in
tests/integration/test_mcp_backups.py.
"""
from __future__ import annotations

from datetime import datetime, timedelta, timezone

from steward.backup.check import AreaCheck, CheckReport, RowDiff, TableCheck
from steward.mcp.tools import backups, overview
from steward.models.users import UserRole

NOW = datetime(2026, 10, 15, 6, 0, tzinfo=timezone.utc)     # three hours after the 03:00 slot
SLOT = datetime(2026, 10, 15, 3, 0, tzinfo=timezone.utc)

BUCKET = {"backup.s3_endpoint": "http://archives:8081", "backup.s3_bucket": "steward",
          "backup.s3_access_key": "AK", "backup.s3_secret_key": "SK"}


def _settings(**over) -> dict:
    return {"backup.enabled": True, "backup.schedule_hour": 3, "backup.schedule_tz": "UTC",
            **BUCKET, **over}


def _entry(at: datetime, ok: bool, error: str = "") -> dict:
    return {"at": at.isoformat(), "ok": ok, "by": "schedule", "name": "steward-x.tar" if ok else "",
            "size": 1000 if ok else 0, "secs": 2.0, "error": error}


def test_the_next_backup_is_tomorrows_slot_an_hour_after_a_failure_or_the_next_tick():
    assert backups.next_backup_at(_settings(**{"backup.enabled": False}), NOW) is None
    done = _settings(**{"backup.last_success_at": (SLOT + timedelta(minutes=5)).isoformat()})
    assert backups.next_backup_at(done, NOW) == SLOT + timedelta(days=1)
    tried = _settings(**{"backup.last_success_at": (SLOT - timedelta(days=1)).isoformat(),
                         "backup.last_attempt_at": (NOW - timedelta(minutes=20)).isoformat()})
    assert backups.next_backup_at(tried, NOW) == NOW + timedelta(minutes=40)
    due = _settings(**{"backup.last_success_at": (SLOT - timedelta(days=1)).isoformat()})
    assert backups.next_backup_at(due, NOW) == NOW + timedelta(minutes=15)


def test_the_overview_says_nothing_about_backups_that_are_off_running_or_fine():
    assert overview.backup_findings({"backup.enabled": False}, False, NOW) == []
    failed = _settings(**{"backup.history": [_entry(NOW, False, "refused")]})
    assert overview.backup_findings(failed, True, NOW) == []
    fine = _settings(**{"backup.history": [_entry(SLOT, True)],
                        "backup.last_success_at": SLOT.isoformat()})
    assert overview.backup_findings(fine, False, NOW) == []
    assert overview.backup_findings(_settings(), False, NOW) == []      # never run yet: not overdue


def test_backups_on_with_no_bucket_is_a_finding():
    settings = {"backup.enabled": True, "backup.schedule_hour": 3}
    [f] = overview.backup_findings(settings, False, NOW)
    assert f["kind"] == "backup_not_set_up" and f["next"] == "list_backups()"


def test_failed_backups_are_counted_since_the_first_in_a_row():
    good = SLOT - timedelta(days=1)
    history = [_entry(NOW - timedelta(hours=1), False, "Upload of steward-x.tar refused: 500"),
               _entry(SLOT, False, "unreachable"), _entry(good, True)]
    [f] = overview.backup_findings(_settings(**{"backup.history": history,
                                                "backup.last_success_at": good.isoformat()}),
                                   False, NOW)
    assert f["kind"] == "backup_failed" and f["severity"] == "warning"
    assert "(2 tries in a row): Upload of steward-x.tar refused: 500" in f["summary"]
    assert f"the newest good one was sent {overview.iso(good)}" in f["summary"]
    assert f["since"] == "2026-10-15T03:00:00Z"


def test_no_backup_two_hours_past_its_slot_is_overdue():
    yesterday = SLOT - timedelta(days=1)
    settings = _settings(**{"backup.history": [_entry(yesterday, True)],
                            "backup.last_success_at": yesterday.isoformat()})
    [f] = overview.backup_findings(settings, False, NOW)
    assert f["kind"] == "backup_overdue" and f["since"] == "2026-10-15T03:00:00Z"
    assert overview.backup_findings(settings, False, SLOT + timedelta(minutes=90)) == []


def test_a_check_names_only_the_tables_that_differ_and_keeps_secret_values_out():
    many = [f"host-{i}" for i in range(backups.ROWS_SHOWN + 5)]
    report = CheckReport(
        name="steward-20261015T030000Z.tar", manifest={"created_at": SLOT.isoformat()},
        schema="same", backup_heads=["a1"], here_heads=["a1"], key_same=True, sealed=4, unopened=0,
        areas=[AreaCheck("Settings", [
            TableCheck("app_settings", same=10, differ=[
                RowDiff("backup.schedule_hour", ["value_json"], False, "3", "4"),
                RowDiff("smtp.password", ["value_json"], True)]),
            TableCheck("users", same=2)]),
            AreaCheck("Hosts", [TableCheck("hosts", same=1, only_backup=many)])])
    out = backups.report_dict(report)
    assert out["ok"] is True and out["made_at"] == "2026-10-15T03:00:00Z"
    assert out["changes"] == 2 + len(many) and out["rows"] == 13 + out["changes"]
    settings_area, hosts_area = out["areas"]
    assert [t["table"] for t in settings_area["tables"]] == ["app_settings"]
    plain, secret = settings_area["tables"][0]["differ"]
    assert (plain["backup_value"], plain["here_value"]) == ("3", "4")
    assert secret == {"label": "smtp.password", "columns": ["value_json"], "secret": True}
    hosts = hosts_area["tables"][0]
    assert len(hosts["only_in_backup"]) == backups.ROWS_SHOWN and hosts["not_named"] == 5


def test_backup_tools_are_admin_like_the_page(app):
    mcp = app.mcp_server
    for name, read_only in (("list_backups", True), ("check_backup", True), ("make_backup", False)):
        assert mcp.tool_roles[name] is UserRole.admin, name
        assert mcp._tool_manager.get_tool(name).annotations.read_only_hint is read_only, name
        assert (mcp._tool_manager.get_tool(name).description or "").strip(), name