"""Tests for ``python -m app.sync.cli`` (M6 Part B).

The CLI's network / DB / scheduler-loop paths are exercised manually (they
need real env + a running DB). These tests verify the testable surface:

* ``--help`` and the subcommand parsers build without error.
* The ``sync`` command dispatches into :class:`SyncScheduler.run_once` with
  the right entity and prints a summary line.
* An unknown subcommand / bad ``--entity`` exits non-zero.
* Env-var fallbacks (``FULL_SYNC_HOUR`` / ``MESSAGE_INTERVAL_HOURS``) work.
"""

from __future__ import annotations

import asyncio
from typing import Any
from unittest.mock import AsyncMock, MagicMock

import pytest

from app.sync import cli as cli_module
from app.sync.orchestrator import SyncResult


# ---------------------------------------------------------------------------
# Argument parser
# ---------------------------------------------------------------------------


def test_parser_help_lists_both_subcommands(capsys):
    """``--help`` mentions both ``sync`` and ``scheduler``."""
    with pytest.raises(SystemExit) as exc:
        cli_module._build_parser().parse_args(["--help"])
    assert exc.value.code == 0
    out = capsys.readouterr().out
    assert "sync" in out
    assert "scheduler" in out


def test_parser_requires_subcommand():
    """No subcommand -> argparse errors (exit code 2)."""
    with pytest.raises(SystemExit) as exc:
        cli_module._build_parser().parse_args([])
    assert exc.value.code == 2


def test_parser_sync_entity_choices_match_registry():
    """``--entity`` choices mirror the scheduler registry."""
    parser = cli_module._build_parser()
    args = parser.parse_args(["sync", "--entity", "friends"])
    assert args.command == "sync"
    assert args.entity == "friends"


def test_parser_rejects_unknown_entity():
    """An unknown entity name is rejected by argparse (exit code 2)."""
    with pytest.raises(SystemExit) as exc:
        cli_module._build_parser().parse_args(["sync", "--entity", "nope"])
    assert exc.value.code == 2


def test_parser_scheduler_flags_default_none():
    """``--full-sync-hour`` and ``--message-interval-hours`` default to None (env-fallback path)."""
    args = cli_module._build_parser().parse_args(["scheduler"])
    assert args.full_sync_hour is None
    assert args.message_interval_hours is None


# ---------------------------------------------------------------------------
# main() — exit codes
# ---------------------------------------------------------------------------


def test_main_returns_2_on_unknown_subcommand(capsys):
    """An unknown subcommand surfaces as exit code 2 (argparse)."""
    with pytest.raises(SystemExit) as exc:
        cli_module.main(["bogus"])
    assert exc.value.code == 2


def test_main_value_error_becomes_exit_2(monkeypatch, capsys):
    """A ValueError surfaced from a command (e.g. unknown entity) is exit 2."""
    async def _boom(_args):
        raise ValueError("unknown entity: does_not_exist")
    monkeypatch.setattr(cli_module, "_cmd_sync", _boom)
    rc = cli_module.main(["sync", "--entity", "friends"])
    assert rc == 2
    err = capsys.readouterr().err
    assert "unknown entity" in err


def test_main_generic_exception_becomes_exit_1(monkeypatch):
    """Any non-ValueError exception is exit 1 (don't print misleading usage)."""
    async def _boom(_args):
        raise RuntimeError("kaboom")
    monkeypatch.setattr(cli_module, "_cmd_sync", _boom)
    rc = cli_module.main(["sync"])
    assert rc == 1


# ---------------------------------------------------------------------------
# _cmd_sync — dispatch + summary printing
# ---------------------------------------------------------------------------


def test_cmd_sync_dispatches_run_once_and_prints_summary(monkeypatch, capsys):
    """``sync`` builds a SyncScheduler, calls run_once(<entity>), prints a summary."""
    # ``_cmd_sync`` is async — wrap a coroutine-returning stub via patch.
    fake_results = [
        SyncResult(entity="wechat_friend", status="success", fetched=3, upserted=3),
        SyncResult(entity="message", status="success", fetched=10, upserted=10, channel="wechat"),
    ]

    async def _fake_init_db(_db_url):
        engine = MagicMock()
        engine.dispose = AsyncMock()
        sm = MagicMock()
        return engine, sm

    scheduler_mock = MagicMock()
    scheduler_mock.run_once = AsyncMock(return_value=list(fake_results))

    def _ctor(*, engine, session_maker):
        # Returned to _cmd_sync which then calls .run_once() on it.
        return scheduler_mock

    monkeypatch.setattr(cli_module, "_init_db", _fake_init_db)
    monkeypatch.setattr(cli_module, "SyncScheduler", _ctor)

    args = cli_module._build_parser().parse_args(["sync", "--entity", "friends"])
    rc = asyncio.run(cli_module._cmd_sync(args))

    assert rc == 0
    scheduler_mock.run_once.assert_awaited_once_with("friends")
    out = capsys.readouterr().out
    assert "[sync] friends" in out
    assert "fetched=13" in out
    assert "upserted=13" in out


def test_cmd_sync_partial_failure_is_exit_0(monkeypatch):
    """If at least one sub-result succeeded, exit 0 (partial delivery)."""
    fake_results = [
        SyncResult(entity="department", status="success", fetched=2, upserted=2),
        SyncResult(entity="wechat_friend", status="failed", fetched=0, upserted=0, error="x"),
    ]
    async def _fake_init_db(_db_url):
        engine = MagicMock()
        engine.dispose = AsyncMock()
        return engine, MagicMock()
    scheduler_mock = MagicMock()
    scheduler_mock.run_once = AsyncMock(return_value=list(fake_results))
    monkeypatch.setattr(cli_module, "_init_db", _fake_init_db)
    monkeypatch.setattr(cli_module, "SyncScheduler", lambda **kw: scheduler_mock)

    args = cli_module._build_parser().parse_args(["sync"])
    rc = asyncio.run(cli_module._cmd_sync(args))
    assert rc == 0


def test_cmd_sync_all_failed_is_exit_1(monkeypatch):
    """Every sub-run failed -> exit 1 (nothing useful delivered)."""
    fake_results = [
        SyncResult(entity="department", status="failed", fetched=0, upserted=0, error="x"),
        SyncResult(entity="wechat_friend", status="failed", fetched=0, upserted=0, error="y"),
    ]
    async def _fake_init_db(_db_url):
        engine = MagicMock()
        engine.dispose = AsyncMock()
        return engine, MagicMock()
    scheduler_mock = MagicMock()
    scheduler_mock.run_once = AsyncMock(return_value=list(fake_results))
    monkeypatch.setattr(cli_module, "_init_db", _fake_init_db)
    monkeypatch.setattr(cli_module, "SyncScheduler", lambda **kw: scheduler_mock)

    args = cli_module._build_parser().parse_args(["sync"])
    rc = asyncio.run(cli_module._cmd_sync(args))
    assert rc == 1


# ---------------------------------------------------------------------------
# Env-var fallbacks for the scheduler command
# ---------------------------------------------------------------------------


def test_env_int_returns_default_when_missing(monkeypatch):
    """Missing env var -> default."""
    monkeypatch.delenv("FULL_SYNC_HOUR", raising=False)
    assert cli_module._env_int("FULL_SYNC_HOUR", default=42) == 42


def test_env_int_parses_value(monkeypatch):
    """A clean int env var is parsed."""
    monkeypatch.setenv("FULL_SYNC_HOUR", "13")
    assert cli_module._env_int("FULL_SYNC_HOUR", default=2) == 13


def test_env_int_falls_back_on_garbage(monkeypatch, capsys):
    """Non-int env var falls back to default + prints a warning."""
    monkeypatch.setenv("FULL_SYNC_HOUR", "two")
    assert cli_module._env_int("FULL_SYNC_HOUR", default=2) == 2
    err = capsys.readouterr().err
    assert "FULL_SYNC_HOUR" in err


# ---------------------------------------------------------------------------
# _init_db — create_all is invoked
# ---------------------------------------------------------------------------


async def test_init_db_creates_tables():
    """_init_db returns an engine + session maker and runs create_all.

    Uses an in-memory SQLite engine via the real SQLAlchemy path so the
    create_all call is exercised end-to-end (not mocked).
    """
    from sqlalchemy import text

    engine, sm = await cli_module._init_db("sqlite+aiosqlite:///:memory:")
    try:
        # Tables created: customer is one of the registered tables.
        from app.db.base import Base

        assert "customer" in Base.metadata.tables
        # engine + session_maker both usable (no exception = pass).
        async with sm() as s:
            await s.execute(text("SELECT 1"))
    finally:
        await engine.dispose()