from datetime import datetime, timedelta, timezone
from pathlib import Path

import pytest
from alembic import command
from alembic.config import Config
from sqlalchemy import inspect
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import Session

from app.db import Base, create_database_engine

from app.models.operations import AuditLog, IdempotencyRecord, Job, JobStatus
from app.security.policy import Role
from app.services.idempotency import IdempotencyConflict, IdempotencyService
from app.services.identity import IdentityRepository


def make_session():
    engine = create_database_engine("sqlite+pysqlite:///:memory:")
    Base.metadata.create_all(engine)
    return engine, Session(engine)


def test_operations_migrations_round_trip_and_match_models(tmp_path, monkeypatch):
    database_url = f"sqlite+pysqlite:///{tmp_path / 'migration-roundtrip.db'}"
    monkeypatch.setenv("DATABASE_URL", database_url)
    alembic_config = Config(str(Path(__file__).resolve().parents[1] / "alembic.ini"))
    alembic_config.set_main_option("sqlalchemy.url", database_url)

    command.upgrade(alembic_config, "head")
    engine = create_database_engine(database_url)
    try:
        inspector = inspect(engine)
        assert {"jobs", "idempotency_records", "audit_logs"}.issubset(
            set(inspector.get_table_names())
        )
        job_columns = {column["name"] for column in inspector.get_columns("jobs")}
        assert {"message", "result", "progress_detail", "metadata"}.issubset(job_columns)
        job_indexes = {index["name"] for index in inspector.get_indexes("jobs")}
        assert {"ix_jobs_org_status_created", "ix_jobs_org_owner"}.issubset(job_indexes)
        job_foreign_keys = {
            (tuple(foreign_key["constrained_columns"]), tuple(foreign_key["referred_columns"]))
            for foreign_key in inspector.get_foreign_keys("jobs")
        }
        assert (("organization_id",), ("id",)) in job_foreign_keys
        assert (("owner_user_id",), ("id",)) in job_foreign_keys
    finally:
        engine.dispose()

    command.downgrade(alembic_config, "0003_memory")
    engine = create_database_engine(database_url)
    try:
        assert "jobs" not in set(inspect(engine).get_table_names())
    finally:
        engine.dispose()

    command.upgrade(alembic_config, "head")
    command.check(alembic_config)


def test_sqlite_engine_enables_foreign_keys():
    engine = create_database_engine("sqlite+pysqlite:///:memory:")
    try:
        with engine.connect() as connection:
            assert connection.exec_driver_sql("PRAGMA foreign_keys").scalar() == 1
    finally:
        engine.dispose()


def test_operations_reject_unknown_organization_reference():
    engine, session = make_session()
    try:
        session.add(
            Job(
                organization_id="org_missing",
                operation="graph.build",
                status=JobStatus.QUEUED,
            )
        )
        with pytest.raises(IntegrityError):
            session.commit()
    finally:
        session.rollback()
        session.close()
        engine.dispose()


def test_operations_enforce_owner_fk_and_delete_actions():
    engine, session = make_session()
    try:
        repo = IdentityRepository(session)
        org = repo.create_organization(name="FK Org", slug="fk-org")
        user = repo.create_user(email="fk@example.com")
        session.commit()

        session.add(
            Job(
                organization_id=org.id,
                owner_user_id="usr_missing",
                operation="graph.build",
                status=JobStatus.QUEUED,
            )
        )
        with pytest.raises(IntegrityError):
            session.commit()
        session.rollback()

        user_job = Job(
            organization_id=org.id,
            owner_user_id=user.id,
            operation="graph.build",
            status=JobStatus.QUEUED,
        )
        org_job = Job(
            organization_id=org.id,
            operation="report.generate",
            status=JobStatus.QUEUED,
        )
        session.add_all([user_job, org_job])
        session.commit()
        user_job_id = user_job.id
        org_job_id = org_job.id

        session.delete(user)
        session.commit()
        persisted_user_job = session.get(Job, user_job_id)
        assert persisted_user_job is not None
        assert persisted_user_job.owner_user_id is None

        session.delete(org)
        session.commit()
        assert session.get(Job, org_job_id) is None
    finally:
        session.close()
        engine.dispose()


def seed_membership(session):
    repo = IdentityRepository(session)
    org = repo.create_organization(name="Org A", slug="ops-org")
    user = repo.create_user(email="ops@example.com")
    membership = repo.create_membership(user.id, org.id, Role.ADMIN)
    session.commit()
    return org, user, membership


def test_operations_schema_has_durable_tables_and_tenant_indexes():
    engine, session = make_session()
    try:
        tables = set(inspect(engine).get_table_names())
        assert {"jobs", "idempotency_records", "audit_logs"}.issubset(tables)
        assert any(
            "organization_id" in index["column_names"]
            for index in inspect(engine).get_indexes("jobs")
        )
    finally:
        session.close()
        engine.dispose()


def test_job_and_audit_records_keep_org_and_owner_scope():
    engine, session = make_session()
    try:
        org, user, _membership = seed_membership(session)
        job = Job(
            organization_id=org.id,
            owner_user_id=user.id,
            operation="graph.build",
            status=JobStatus.QUEUED,
        )
        audit = AuditLog(
            organization_id=org.id,
            actor_user_id=user.id,
            action="job.created",
            target_type="job",
            target_id=job.id,
            details={"safe": True},
        )
        session.add_all([job, audit])
        session.commit()
        assert job.organization_id == org.id
        assert job.owner_user_id == user.id
        assert audit.organization_id == org.id
        assert audit.details == {"safe": True}
    finally:
        session.close()
        engine.dispose()


def test_idempotency_reservation_replays_same_request_and_rejects_hash_conflict():
    engine, session = make_session()
    try:
        org, user, _membership = seed_membership(session)
        service = IdempotencyService(session)
        first = service.reserve(
            organization_id=org.id,
            user_id=user.id,
            key="key-1",
            request_body={"project_name": "A"},
        )
        session.commit()
        assert first.is_new is True

        replay = service.reserve(
            organization_id=org.id,
            user_id=user.id,
            key="key-1",
            request_body={"project_name": "A"},
        )
        assert replay.is_new is False
        assert replay.record.id == first.record.id

        try:
            service.reserve(
                organization_id=org.id,
                user_id=user.id,
                key="key-1",
                request_body={"project_name": "B"},
            )
        except IdempotencyConflict:
            pass
        else:
            raise AssertionError("same idempotency key accepted a different request")
    finally:
        session.close()
        engine.dispose()


def test_idempotency_is_tenant_and_user_scoped():
    engine, session = make_session()
    try:
        repo = IdentityRepository(session)
        org_a = repo.create_organization(name="A", slug="org-a-ops")
        org_b = repo.create_organization(name="B", slug="org-b-ops")
        user_a = repo.create_user(email="a-ops@example.com")
        user_b = repo.create_user(email="b-ops@example.com")
        repo.create_membership(user_a.id, org_a.id, Role.ADMIN)
        repo.create_membership(user_b.id, org_b.id, Role.ADMIN)
        session.commit()
        service = IdempotencyService(session)
        a = service.reserve(
            organization_id=org_a.id,
            user_id=user_a.id,
            key="shared-key",
            request_body={"x": 1},
        )
        b = service.reserve(
            organization_id=org_b.id,
            user_id=user_b.id,
            key="shared-key",
            request_body={"x": 1},
        )
        assert a.is_new is True
        assert b.is_new is True
        assert a.record.id != b.record.id
    finally:
        session.close()
        engine.dispose()