import pytest
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.pool import StaticPool

from app.database import Base
# Import all models to ensure they are registered with Base.metadata
from app.models import admin_user, upstream, snapshot, webhook_config, notification_log, custom_page, website, revoked_token, upstream_key
from app.models.website import Website, WebsiteGroupBinding, WebsiteSyncLog
from app.models.upstream import Upstream
from app.models.snapshot import UpstreamRateSnapshot
import json
from datetime import datetime, timezone

@pytest.fixture()
def db_session():
    engine = create_engine(
        "sqlite://",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    Base.metadata.create_all(bind=engine)
    TestingSessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
    db = TestingSessionLocal()
    try:
        yield db
    finally:
        db.close()
        Base.metadata.drop_all(bind=engine)

def test_sync_website_group_bindings_success(db_session, monkeypatch):
    from app.routers.websites import sync_website_group_bindings
    
    # Setup website
    w = Website(name="W1", base_url="http://w1", enabled=True, auto_sync_enabled=True, auth_config_json="{}", timeout_seconds=30)
    db_session.add(w)
    db_session.commit()
    db_session.refresh(w)
    
    # Setup upstream and snapshot
    u = Upstream(name="U1", base_url="http://u1")
    db_session.add(u)
    db_session.commit()
    db_session.refresh(u)
    
    db_session.add(UpstreamRateSnapshot(
        upstream_id=u.id,
        snapshot_json=json.dumps({"groups": {"G1": {"rate": 1.0}, "G2": {"rate": 2.0}}}),
        captured_at=datetime.now(timezone.utc)
    ))
    db_session.commit()
    
    # Setup 2 bindings
    b1 = WebsiteGroupBinding(website_id=w.id, target_group_id="TG1", target_group_name="TG1", 
                             source_groups_json=json.dumps([{"upstream_id": u.id, "group_id": "G1"}]),
                             algorithm="max_plus_percent", percent=10, enabled=True)
    b2 = WebsiteGroupBinding(website_id=w.id, target_group_id="TG2", target_group_name="TG2",
                             source_groups_json=json.dumps([{"upstream_id": u.id, "group_id": "G2"}]),
                             algorithm="max_plus_percent", percent=10, enabled=True)
    db_session.add_all([b1, b2])
    db_session.commit()
    
    # Mock Website client
    class MockClient:
        def __init__(self, **kwargs): pass
        def __enter__(self): return self
        def __exit__(self, *args): pass
        def get_groups(self, endpoint): return [{"id": "TG1", "rate_multiplier": 1.0}, {"id": "TG2", "rate_multiplier": 2.0}]
        def update_group_rate(self, endpoint, gid, rate): pass

    monkeypatch.setattr("app.services.website_sync.Sub2ApiWebsiteClient", MockClient)
    
    # Call batch sync
    resp = sync_website_group_bindings(w.id, db_session)
    
    assert resp.total == 2
    assert resp.success == 2
    assert "成功 2" in resp.message
    assert len(resp.logs) == 2
    
    # Verify logs in DB
    logs = db_session.query(WebsiteSyncLog).filter(WebsiteSyncLog.website_id == w.id).all()
    assert len(logs) == 2

def test_sync_website_group_bindings_partial_failure(db_session, monkeypatch):
    from app.routers.websites import sync_website_group_bindings
    
    w = Website(name="W1", base_url="http://w1", enabled=True, auto_sync_enabled=True, auth_config_json="{}", timeout_seconds=30)
    db_session.add(w)
    db_session.commit()
    db_session.refresh(w)
    
    u = Upstream(name="U1", base_url="http://u1")
    db_session.add(u)
    db_session.commit()
    db_session.refresh(u)
    
    db_session.add(UpstreamRateSnapshot(
        upstream_id=u.id,
        snapshot_json=json.dumps({"groups": {"G1": {"rate": 1.0}, "G2": {"rate": 2.0}}}),
        captured_at=datetime.now(timezone.utc)
    ))
    db_session.commit()
    
    b1 = WebsiteGroupBinding(website_id=w.id, target_group_id="TG1", 
                             source_groups_json=json.dumps([{"upstream_id": u.id, "group_id": "G1"}]),
                             algorithm="max_plus_percent", percent=10, enabled=True)
    b2 = WebsiteGroupBinding(website_id=w.id, target_group_id="TG2",
                             source_groups_json=json.dumps([{"upstream_id": u.id, "group_id": "G2"}]),
                             algorithm="max_plus_percent", percent=10, enabled=True)
    db_session.add_all([b1, b2])
    db_session.commit()
    
    class MockClient:
        def __init__(self, **kwargs): pass
        def __enter__(self): return self
        def __exit__(self, *args): pass
        def get_groups(self, endpoint): return [] # Will cause sync to fail or skip
        def update_group_rate(self, endpoint, gid, rate):
            if gid == "TG2": raise Exception("Simulated error")

    monkeypatch.setattr("app.services.website_sync.Sub2ApiWebsiteClient", MockClient)
    
    # The sync_binding implementation returns a log with status="failed" on exception during write back
    
    resp = sync_website_group_bindings(w.id, db_session)
    
    # Depending on how sync_binding handles missing target group, it might be "success" (with message) or "failed"
    # Actually if get_groups is empty, sync_binding might fail to find old_rate but it continues to update_group_rate
    # If update_group_rate fails, it returns a failed log.
    
    assert resp.total == 2
    # TG1: update_group_rate succeeds -> success
    # TG2: update_group_rate fails -> failed
    assert resp.success == 1
    assert resp.failed == 1

def test_sync_website_group_bindings_no_bindings(db_session):
    from app.routers.websites import sync_website_group_bindings
    w = Website(name="W1", base_url="http://w1", enabled=True, auth_config_json="{}", timeout_seconds=30)
    db_session.add(w)
    db_session.commit()
    db_session.refresh(w)
    
    resp = sync_website_group_bindings(w.id, db_session)
    assert resp.total == 0
    assert resp.message == "暂无绑定可同步"

def test_sync_website_group_bindings_not_found(db_session):
    from app.routers.websites import sync_website_group_bindings
    from fastapi import HTTPException
    with pytest.raises(HTTPException) as exc:
        sync_website_group_bindings(999, db_session)
    assert exc.value.status_code == 404

def test_sync_website_group_bindings_exception_persists_log(db_session, monkeypatch):
    from app.routers.websites import sync_website_group_bindings
    
    w = Website(name="W1", base_url="http://w1", enabled=True, auth_config_json="{}", timeout_seconds=30)
    db_session.add(w)
    db_session.commit()
    
    b1 = WebsiteGroupBinding(website_id=w.id, target_group_id="TG1", 
                             source_groups_json="[]",
                             algorithm="max_plus_percent", percent=10, enabled=True)
    db_session.add(b1)
    db_session.commit()
    
    # Mock sync_binding to raise an exception
    def mock_sync_binding(db, binding, write):
        raise Exception("Fatal crash")
    
    monkeypatch.setattr("app.routers.websites.sync_binding", mock_sync_binding)
    
    resp = sync_website_group_bindings(w.id, db_session)
    
    assert resp.total == 1
    assert resp.failed == 1
    assert resp.logs[0].status == "failed"
    assert "Fatal crash" in resp.logs[0].message
    
    # Verify it was PERSISTED in the database
    log_in_db = db_session.query(WebsiteSyncLog).filter(WebsiteSyncLog.website_id == w.id).first()
    assert log_in_db is not None
    assert log_in_db.status == "failed"
    assert "Fatal crash" in log_in_db.message