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, tmp_path):
        svc = ProjectService(factory)
        p = svc.create("test", str(tmp_path))
        assert p.id is not None
        assert svc.get(p.id).name == "test"

    def test_list_excludes_archived(self, factory, tmp_path):
        a = tmp_path / "a"
        a.mkdir()
        b = tmp_path / "b"
        b.mkdir()
        svc = ProjectService(factory)
        svc.create("a", str(a))
        p2 = svc.create("b", str(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, tmp_path):
        old = tmp_path / "old"
        old.mkdir()
        new = tmp_path / "new"
        new.mkdir()
        svc = ProjectService(factory)
        p = svc.create("old", str(old))
        updated = svc.update(p.id, "new", str(new))
        assert updated.name == "new"
        assert updated.path == str(new.resolve())
        assert svc.get(p.id).path == str(new.resolve())

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

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

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

    def test_create_rejects_nonexistent_path(self, factory, tmp_path):
        svc = ProjectService(factory)
        missing = tmp_path / "does-not-exist"
        with pytest.raises(ServiceError, match="does not exist or is not a directory"):
            svc.create("p", str(missing))

    def test_create_rejects_file_path(self, factory, tmp_path):
        svc = ProjectService(factory)
        a_file = tmp_path / "afile"
        a_file.write_text("x")
        with pytest.raises(ServiceError, match="does not exist or is not a directory"):
            svc.create("p", str(a_file))

    def test_create_stores_resolved_absolute_path(self, factory, tmp_path):
        svc = ProjectService(factory)
        p = svc.create("p", str(tmp_path))
        assert p.path == str(tmp_path.resolve())

    def test_create_expands_user_home(self, factory, tmp_path, monkeypatch):
        # Point ~ at tmp_path; "~" must expand to the existing tmp_path dir.
        monkeypatch.setenv("HOME", str(tmp_path))
        svc = ProjectService(factory)
        p = svc.create("p", "~")
        assert p.path == str(tmp_path.resolve())

    def test_update_rejects_nonexistent_path_and_leaves_row(self, factory, tmp_path):
        svc = ProjectService(factory)
        p = svc.create("p", str(tmp_path))
        missing = tmp_path / "nope"
        with pytest.raises(ServiceError, match="does not exist or is not a directory"):
            svc.update(p.id, "p", str(missing))
        assert svc.get(p.id).path == str(tmp_path.resolve())


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, tmp_path):
        psvc = ProjectService(factory)
        msvc = McpService(factory)
        project = psvc.create("proj", str(tmp_path))
        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