from __future__ import annotations

from datetime import UTC, datetime, timedelta
import unittest

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

from govoplan_access.backend.db import models as access_models  # noqa: F401
from govoplan_core.core.provider_governance import ExternalProviderStateContext
from govoplan_core.db.base import Base
from govoplan_mail.backend.db.models import (
    MailBounceSource,
    MailDeliveryCommand,
    MailMailboxFolderIndex,
    MailMailboxMessageIndex,
    MailPop3Import,
    MailServerEndpoint,
    MailServerProfile,
)
from govoplan_mail.backend.manifest import manifest
from govoplan_mail.backend.provider_state import (
    IMAP_PROVIDER_ID,
    POP3_PROVIDER_ID,
    SMTP_PROVIDER_ID,
    imap_provider_states,
    pop3_provider_states,
    smtp_provider_states,
)


class MailProviderStateTests(unittest.TestCase):
    def setUp(self) -> None:
        self.engine = create_engine("sqlite+pysqlite:///:memory:", future=True)
        Base.metadata.create_all(
            self.engine,
            tables=(
                MailServerProfile.__table__,
                MailServerEndpoint.__table__,
                MailDeliveryCommand.__table__,
                MailMailboxFolderIndex.__table__,
                MailMailboxMessageIndex.__table__,
                MailBounceSource.__table__,
                MailPop3Import.__table__,
            ),
        )
        self.session = sessionmaker(bind=self.engine, expire_on_commit=False)()
        self.profile = MailServerProfile(
            id="profile-1",
            tenant_id="tenant-1",
            scope_type="tenant",
            scope_id="tenant-1",
            name="Mail",
            slug="mail",
            is_active=True,
            smtp_config={"host": "smtp.example.test", "port": 587},
            imap_config={"host": "imap.example.test", "port": 993},
        )
        self.session.add(
            self.profile
        )
        self.session.add(
            MailMailboxFolderIndex(
                id="folder-1",
                tenant_id="tenant-1",
                profile_id=self.profile.id,
                folder="INBOX",
                indexed_at=datetime.now(UTC),
            )
        )
        self.session.commit()

    def tearDown(self) -> None:
        self.session.close()
        self.engine.dispose()

    def test_smtp_state_exposes_reconciliation_without_server_or_secrets(self) -> None:
        self.session.add(
            MailDeliveryCommand(
                id="command-1",
                tenant_id="tenant-1",
                command_type="message",
                source_module="notifications",
                source_resource_type="notification",
                idempotency_key="notification-1",
                canonical_request_hash="a" * 64,
                profile_id=self.profile.id,
                expected_smtp_transport_revision="revision-1",
                message_sha256="b" * 64,
                message_size_bytes=10,
                recipient_count=1,
                status="outcome_unknown",
                expires_at=datetime.now(UTC) + timedelta(days=1),
            )
        )
        self.session.flush()

        state = smtp_provider_states(
            ExternalProviderStateContext(session=self.session, tenant_id="tenant-1")
        )[0]

        self.assertEqual("warning", state.health)
        self.assertEqual("pending", state.conflict)
        self.assertEqual("attention", state.recovery)
        self.assertEqual(1, state.metrics["outcome_unknown_commands"])
        self.assertNotIn("smtp.example.test", str(state.to_dict()))

    def test_imap_state_is_fresh_tenant_bounded_and_registered(self) -> None:
        state = imap_provider_states(
            ExternalProviderStateContext(session=self.session, tenant_id="tenant-1")
        )[0]

        self.assertEqual("healthy", state.health)
        self.assertEqual("current", state.freshness)
        self.assertEqual("external_mirror", state.authority_mode)
        self.assertNotIn("imap.example.test", str(state.to_dict()))
        self.assertEqual(
            (),
            imap_provider_states(
                ExternalProviderStateContext(
                    session=self.session,
                    tenant_id="tenant-2",
                )
            ),
        )
        self.assertEqual(
            {SMTP_PROVIDER_ID, IMAP_PROVIDER_ID, POP3_PROVIDER_ID},
            {item.id for item in manifest.external_providers},
        )
        self.assertEqual(
            {SMTP_PROVIDER_ID, IMAP_PROVIDER_ID, POP3_PROVIDER_ID},
            {
                item.provider_id
                for item in manifest.external_provider_state_providers
            },
        )

    def test_pop3_state_is_disabled_by_default_and_projects_deletion_evidence(self) -> None:
        endpoint = MailServerEndpoint(
            id="pop3-server-1",
            profile_id=self.profile.id,
            tenant_id="tenant-1",
            protocol="pop3",
            name="Legacy POP3",
            config={"host": "pop3.example.test", "legacy_import_enabled": False},
            scope_type="tenant",
            scope_id="tenant-1",
            is_active=True,
        )
        self.session.add(endpoint)
        self.session.flush()

        disabled = pop3_provider_states(
            ExternalProviderStateContext(session=self.session, tenant_id="tenant-1")
        )[0]
        self.assertFalse(disabled.active)
        self.assertEqual("inactive", disabled.health)

        endpoint.config = {
            "host": "pop3.example.test",
            "legacy_import_enabled": True,
        }
        self.session.add(
            MailPop3Import(
                id="pop3-import-1",
                tenant_id="tenant-1",
                profile_id=self.profile.id,
                pop3_server_id=endpoint.id,
                transport_revision=endpoint.transport_revision,
                provider_uidl="uid-1",
                fingerprint="a" * 64,
                raw_sha256="b" * 64,
                raw_message_encrypted="ciphertext-do-not-project",
                size_bytes=42,
                imported_at=datetime.now(UTC),
                deletion_requested=True,
                deletion_status="outcome_unknown",
            )
        )
        self.session.add(
            MailPop3Import(
                id="pop3-import-tenant-2",
                tenant_id="tenant-2",
                profile_id=self.profile.id,
                pop3_server_id=endpoint.id,
                transport_revision=endpoint.transport_revision,
                provider_uidl="uid-tenant-2",
                fingerprint="c" * 64,
                raw_sha256="d" * 64,
                raw_message_encrypted="other-tenant-ciphertext",
                size_bytes=42,
                imported_at=datetime.now(UTC),
                deletion_requested=True,
                deletion_status="failed",
            )
        )
        self.session.flush()

        state = pop3_provider_states(
            ExternalProviderStateContext(session=self.session, tenant_id="tenant-1")
        )[0]
        self.assertTrue(state.active)
        self.assertEqual("warning", state.health)
        self.assertEqual("pending", state.conflict)
        self.assertEqual(1, state.metrics["outcome_unknown_deletions"])
        self.assertEqual(0, state.metrics["failed_deletions"])
        self.assertNotIn("pop3.example.test", str(state.to_dict()))
        self.assertNotIn("ciphertext-do-not-project", str(state.to_dict()))


if __name__ == "__main__":
    unittest.main()