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

from hqt.db.models import Base
from hqt.errors import ServiceError
from hqt.mcp.service import McpService
from hqt.projects.service import ProjectService


@pytest.fixture
def factory():
    # StaticPool + check_same_thread=False: every session created by the
    # factory shares the single in-memory connection, so per-operation
    # sessions all see the same database.
    engine = create_engine(
        "sqlite://",
        connect_args={"check_same_thread": False},
        poolclass=StaticPool,
    )
    Base.metadata.create_all(engine)
    return sessionmaker(bind=engine, expire_on_commit=False)


class TestProjectService:
    def test_create_and_get(self, factory):
        svc = ProjectService(factory)
        p = svc.create("test", "/tmp/test")
        assert p.id is not None
        assert svc.get(p.id).name == "test"

    def test_list_excludes_archived(self, factory):
        svc = ProjectService(factory)
        svc.create("a", "/a")
        p2 = svc.create("b", "/b")
        svc.archive(p2.id)
        assert len(svc.list_all()) == 1
        assert len(svc.list_all(include_archived=True)) == 2

    def test_update_name_and_path(self, factory):
        svc = ProjectService(factory)
        p = svc.create("old", "/old/path")
        updated = svc.update(p.id, "new", "/new/path")
        assert updated.name == "new"
        assert updated.path == "/new/path"
        assert svc.get(p.id).path == "/new/path"

    def test_update_duplicate_path_raises(self, factory):
        svc = ProjectService(factory)
        svc.create("a", "/a")
        p2 = svc.create("b", "/b")
        with pytest.raises(ServiceError, match="already uses path"):
            svc.update(p2.id, "b", "/a")
        # DB session must remain usable after rollback, values unchanged
        assert svc.get(p2.id).path == "/b"
        assert svc.get(p2.id).name == "b"

    def test_update_unknown_id_raises(self, factory):
        svc = ProjectService(factory)
        with pytest.raises(ServiceError, match="not found"):
            svc.update(9999, "x", "/x")

    def test_create_duplicate_path_raises_service_error(self, factory):
        svc = ProjectService(factory)
        svc.create("a", "/dup")
        with pytest.raises(ServiceError, match="already uses path"):
            svc.create("b", "/dup")


class TestMcpService:
    def test_crud(self, factory):
        svc = McpService(factory)
        server = svc.create("test-mcp", "stdio", command="node", args=["server.js"])
        assert server.id is not None
        assert svc.get("test-mcp") is not None
        assert len(svc.list_all()) == 1
        svc.delete("test-mcp")
        assert svc.get("test-mcp") is None

    def test_bind_unbind(self, factory):
        psvc = ProjectService(factory)
        msvc = McpService(factory)
        project = psvc.create("proj", "/proj")
        server = msvc.create("s1", "stdio", command="cmd")
        msvc.bind_to_project(project.id, server.id)
        assert len(msvc.get_project_mcps(project.id)) == 1
        msvc.unbind_from_project(project.id, server.id)
        assert len(msvc.get_project_mcps(project.id)) == 0