"""Model-level tests: defaults, constraints, JSON roundtrip, linkage."""

import uuid

import pytest
from sqlalchemy.exc import IntegrityError
from sqlmodel import select

from app.models import ApprovalTask, FlowDefinition, FlowRun, FlowVersion


def test_flow_definition_defaults(session):
    from datetime import UTC, datetime

    before = datetime.now(UTC).replace(tzinfo=None)
    d = FlowDefinition(name="bauvorhaben")
    session.add(d)
    session.commit()
    session.refresh(d)
    assert d.id is not None
    assert d.status == "active"
    assert d.continuation_flow_id is None
    assert d.created_at is not None
    # Timestamps are written as UTC. SQLite does not round-trip tzinfo, so
    # after a refresh the value is calendar-time UTC without tzinfo.
    assert d.created_at.tzinfo is None
    assert abs((d.created_at - before).total_seconds()) < 60


def test_flow_definition_name_unique(session):
    session.add(FlowDefinition(name="doppelt"))
    session.commit()
    session.add(FlowDefinition(name="doppelt"))
    with pytest.raises(IntegrityError):
        session.commit()
    session.rollback()


def test_flow_version_unique_per_flow(session):
    d = FlowDefinition(name="v-flow")
    session.add(d)
    session.commit()
    session.add(FlowVersion(flow_id=d.id, version_no=1, author="a"))
    session.commit()
    session.add(FlowVersion(flow_id=d.id, version_no=1, author="b"))
    with pytest.raises(IntegrityError):
        session.commit()
    session.rollback()
    session.add(FlowVersion(flow_id=d.id, version_no=2, author="b"))
    session.commit()


def test_flow_version_json_roundtrip(session):
    payload = {"data": {"nodes": [{"id": "n1"}], "edges": []}, "name": "x"}
    d = FlowDefinition(name="json-flow")
    session.add(d)
    session.commit()
    v = FlowVersion(flow_id=d.id, version_no=1, langflow_json=payload)
    session.add(v)
    session.commit()
    session.refresh(v)
    assert v.langflow_json == payload
    assert v.deployed_at is None
    assert v.lfx_flow_id is None


def test_run_and_task_linkage_with_tenant_default(session):
    d = FlowDefinition(name="linked")
    session.add(d)
    session.commit()
    v = FlowVersion(flow_id=d.id, version_no=1)
    session.add(v)
    session.commit()
    run = FlowRun(version_id=v.id, input={"a": 1})
    session.add(run)
    session.commit()
    task = ApprovalTask(run_id=run.id, version_id=v.id, title="bitte pruefen")
    session.add(task)
    session.commit()

    assert run.tenant_id == "default"
    assert run.status == "running"
    assert task.tenant_id == "default"
    assert task.status == "open"

    runs = session.exec(select(FlowRun).where(FlowRun.version_id == v.id)).all()
    assert len(runs) == 1
    tasks = session.exec(select(ApprovalTask).where(ApprovalTask.run_id == run.id)).all()
    assert len(tasks) == 1
    assert tasks[0].payload == {}


def test_create_version_populates_input_schema(session):
    from app.flows import store
    from app.flows.schemas import FlowVersionCreate

    d = FlowDefinition(name="cached")
    session.add(d)
    session.commit()
    doc = {
        "name": "cached",
        "data": {
            "nodes": [
                {
                    "id": "n1",
                    "data": {
                        "type": "ChatInput",
                        "node": {"display_name": "Chat", "template": {}},
                    },
                }
            ],
            "edges": [],
        },
    }
    version = store.create_version(session, d.id, FlowVersionCreate(langflow_json=doc))
    assert version.input_schema["fallback"] == "textarea"


def test_input_schema_null_rejected(session):
    from sqlalchemy import text
    from sqlalchemy.exc import IntegrityError

    d = FlowDefinition(name="nonnull")
    session.add(d)
    session.commit()
    with pytest.raises(IntegrityError):
        session.execute(
            text(
                "INSERT INTO flow_versions (id, flow_id, version_no, langflow_json,"
                " author, input_schema) VALUES (:id, :flow_id, 1, :doc, :author, NULL)"
            ),
            {"id": str(uuid.uuid4()), "flow_id": str(d.id), "doc": "{}", "author": "t"},
        )
        session.commit()
    session.rollback()