"""
Copyright 2024-2026 ReplyPier

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

from unittest.mock import patch
from datetime import datetime, timezone
from uuid import uuid4

import pytest

from app.models.chat_history import ChatHistory
from app.models.session_to_agent import SessionStatus, SessionToAgent
from app.services.message_delivery import DeliveryResult
from app.models.ticket import (
    Ticket,
    TicketPriority,
    TicketSource,
    TicketStatus,
)
from app.models.ticket_activity import TicketActivityType, TicketActorType
from app.services.ticket import NATIVE_INTEGRATION_TYPE, TicketService, render_customer_template


@pytest.fixture(autouse=True)
def no_embeddings():
    """Embeddings hit the local FastEmbed model — irrelevant to these tests."""
    with patch("app.services.ticket.embed_ticket_text", return_value=None):
        yield


@pytest.fixture
def service(db):
    return TicketService(db)


@pytest.fixture
def test_session(db, test_organization, test_customer, test_agent) -> SessionToAgent:
    session = SessionToAgent(
        session_id=uuid4(),
        organization_id=test_organization.id,
        customer_id=test_customer.id,
        agent_id=test_agent.id,
        status=SessionStatus.OPEN,
        channel="web",
    )
    db.add(session)
    db.commit()
    db.refresh(session)
    return session


def make_ticket(service, db, org, **overrides) -> Ticket:
    kwargs = dict(
        organization_id=org.id,
        title="Payout delayed for merchant #8842",
        description="Batch stuck in processing.",
        priority=TicketPriority.HIGH,
        source=TicketSource.MANUAL,
    )
    kwargs.update(overrides)
    ticket, _dupes = service.create_ticket(**kwargs)
    db.commit()
    db.refresh(ticket)
    return ticket


class TestTicketCreation:
    def test_a_chat_ticket_can_leave_the_sessions_customer_off(self, service, db, test_organization, test_session):
        """A visitor bound to a customer by an email they typed: the ticket must not
        carry that customer's identity to the investigator."""
        ticket = make_ticket(service, db, test_organization, session_id=test_session.session_id,
                             source=TicketSource.CHAT_AI, link_session_customer=False)

        assert ticket.customer_id is None

    def test_numbers_are_sequential_per_org(self, service, db, test_organization):
        first = make_ticket(service, db, test_organization)
        second = make_ticket(service, db, test_organization)
        assert first.ticket_number == 1
        assert second.ticket_number == 2
        assert second.display_number == "TKT-2"

    def test_create_links_session_and_mirrors_columns(
        self, service, db, test_organization, test_session
    ):
        ticket = make_ticket(
            service, db, test_organization,
            session_id=test_session.session_id, source=TicketSource.CHAT_AI,
        )
        db.refresh(test_session)
        assert test_session.ticket_id == ticket.display_number
        assert test_session.integration_type == NATIVE_INTEGRATION_TYPE
        assert test_session.ticket_status == TicketStatus.OPEN.value
        assert service.repo.get_by_session(test_session.session_id).id == ticket.id
        # Customer/agent inherited from the session
        assert ticket.customer_id == test_session.customer_id
        assert ticket.agent_id == test_session.agent_id

    def test_create_enqueues_triage_run(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        runs = service.run_repo.list_for_ticket(ticket.id)
        assert len(runs) == 1
        assert runs[0].run_type == "triage"
        assert runs[0].status == "pending"

    def test_create_without_auto_investigate(self, service, db, test_organization):
        settings = service.settings_repo.get_or_create(test_organization.id)
        settings.auto_investigate_on_create = False
        db.commit()
        ticket = make_ticket(service, db, test_organization)
        assert service.run_repo.list_for_ticket(ticket.id) == []

    def test_creation_writes_audit_activity(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        activities = service.activity_repo.list_for_ticket(ticket.id)
        assert activities[0].activity_type == TicketActivityType.STATUS_CHANGE.value
        assert activities[0].activity_metadata["to"] == TicketStatus.OPEN.value


class TestOrgIsolation:
    def test_foreign_session_rejected(self, service, db, test_organization, test_session):
        """A session belonging to another org must not be linkable (it would
        mutate that org's session row and message its customer)."""
        from app.models.organization import Organization
        other_org = Organization(name="Other Org", domain="other.example", timezone="UTC")
        db.add(other_org)
        db.commit()
        with pytest.raises(ValueError, match="Session not found"):
            service.create_ticket(
                organization_id=other_org.id,
                title="Sneaky cross-org ticket",
                session_id=test_session.session_id,
            )

    def test_jira_linked_session_not_clobbered(
        self, service, db, test_organization, test_session
    ):
        """An explicit Jira linkage on the session survives native ticket
        creation — JiraTools reads ticket_id as a Jira issue key."""
        test_session.ticket_id = "SUP-123"
        test_session.integration_type = "JIRA"
        db.commit()
        make_ticket(
            service, db, test_organization, session_id=test_session.session_id
        )
        db.refresh(test_session)
        assert test_session.ticket_id == "SUP-123"
        assert test_session.integration_type == "JIRA"


class TestSearchEscaping:
    def test_literal_percent_does_not_wildcard(self, service, db, test_organization):
        make_ticket(service, db, test_organization, title="CPU at 100% on ingest")
        make_ticket(service, db, test_organization, title="Login broken")
        tickets, total = service.repo.list(test_organization.id, search="100% on")
        assert total == 1
        # A bare '%' must not match everything.
        _t, total_all = service.repo.list(test_organization.id, search="%")
        assert total_all == 1


class TestTriagePriorityValidation:
    def test_invalid_llm_priority_is_ignored(self, service, db, test_organization):
        from app.models.schemas.investigation import TriageResult
        from app.workers.ticket_investigator import _apply_triage
        ticket = make_ticket(service, db, test_organization)
        result = TriageResult(
            title=ticket.title, priority="P1-Critical", intent="bug_report",
            summary="something broke", confidence=0.9,
        )
        _apply_triage(service, ticket, result)
        assert str(ticket.priority) == "high"  # unchanged

    def test_valid_llm_priority_applies(self, service, db, test_organization):
        from app.models.schemas.investigation import TriageResult
        from app.workers.ticket_investigator import _apply_triage
        ticket = make_ticket(service, db, test_organization)
        result = TriageResult(
            title=ticket.title, priority="Urgent", intent="outage",
            summary="prod down", confidence=0.95,
        )
        _apply_triage(service, ticket, result)
        assert str(ticket.priority) == "urgent"


class TestCustomerEmailPath:
    def test_create_with_email_finds_or_creates_customer(
        self, service, db, test_organization
    ):
        ticket = make_ticket(
            service, db, test_organization,
            customer_email="Jane@Example.com", customer_name="Jane Doe",
        )
        assert ticket.customer is not None
        assert ticket.customer.email == "jane@example.com"
        assert ticket.customer.full_name == "Jane Doe"
        # Same email reuses the record instead of duplicating it.
        second = make_ticket(
            service, db, test_organization, customer_email="jane@example.com"
        )
        assert second.customer_id == ticket.customer_id

    def test_can_notify_requires_session_or_email(
        self, service, db, test_organization, test_session
    ):
        no_contact = make_ticket(service, db, test_organization)
        assert service.can_notify_customer(no_contact) is False
        with_email = make_ticket(
            service, db, test_organization, customer_email="c@example.com"
        )
        assert service.can_notify_customer(with_email) is True
        with_session = make_ticket(
            service, db, test_organization, session_id=test_session.session_id
        )
        assert service.can_notify_customer(with_session) is True

    def test_set_customer_links_and_records_activity(
        self, service, db, test_organization
    ):
        ticket = make_ticket(service, db, test_organization)
        assert ticket.customer_id is None
        service.set_customer(ticket, "Late@Example.com", "Late Add")
        db.commit()
        db.refresh(ticket)
        assert ticket.customer.email == "late@example.com"
        assert service.can_notify_customer(ticket) is True
        last = service.activity_repo.list_for_ticket(ticket.id)[-1]
        assert last.activity_type == TicketActivityType.CUSTOMER_LINKED.value
        # Setting the same customer again is a no-op (no duplicate activity).
        count_before = len(service.activity_repo.list_for_ticket(ticket.id))
        service.set_customer(ticket, "late@example.com")
        assert len(service.activity_repo.list_for_ticket(ticket.id)) == count_before

    @pytest.mark.asyncio
    async def test_direct_email_fallback_records_activity(
        self, service, db, test_organization
    ):
        ticket = make_ticket(
            service, db, test_organization, customer_email="c@example.com"
        )
        with patch(
            "app.services.ticket_email.send_ticket_email", return_value=True
        ) as send:
            await service.send_customer_message(ticket, "We are on it")
        send.assert_awaited_once()
        assert send.await_args.kwargs["subject"].startswith(f"[{ticket.display_number}]")
        last = service.activity_repo.list_for_ticket(ticket.id)[-1]
        assert last.activity_type == TicketActivityType.CUSTOMER_NOTIFIED.value
        assert last.activity_metadata["channel"] == "email"
        assert ticket.first_response_at is not None

    @pytest.mark.asyncio
    async def test_web_session_reply_is_also_emailed(
        self, service, db, test_organization, test_session
    ):
        """A widget (web) reply is emitted over the socket to the browser tab
        only; when the customer has a real inbox it must also be emailed so a
        ticket update reaches them after they've closed the chat."""
        ticket = make_ticket(
            service, db, test_organization, session_id=test_session.session_id
        )
        with patch(
            "app.services.ticket.deliver_to_customer"
        ) as deliver, patch(
            "app.services.ticket_email.send_ticket_email", return_value=True
        ) as send:
            await service.send_customer_message(ticket, "Update on your ticket")
        deliver.assert_awaited_once()
        send.assert_awaited_once()
        assert send.await_args.args[2] == test_session.customer.email

    @pytest.mark.asyncio
    async def test_web_session_reply_not_emailed_for_placeholder(
        self, service, db, test_organization, test_session, test_customer
    ):
        """Anonymous widget visitors (…@noemail.com) have no real inbox — the
        socket emit is the only delivery, no email is attempted."""
        test_customer.email = "visitor@noemail.com"
        db.commit()
        ticket = make_ticket(
            service, db, test_organization, session_id=test_session.session_id
        )
        with patch(
            "app.services.ticket.deliver_to_customer"
        ), patch(
            "app.services.ticket_email.send_ticket_email", return_value=True
        ) as send:
            await service.send_customer_message(ticket, "Update on your ticket")
        send.assert_not_awaited()

    @pytest.mark.asyncio
    async def test_undelivered_channel_reply_is_marked_on_its_row(
        self, service, db, test_organization, test_session
    ):
        """A WhatsApp reply refused (e.g. window closed) is stored first and
        flagged, so the thread never shows it as sent."""
        test_session.channel = "whatsapp"
        db.commit()
        ticket = make_ticket(service, db, test_organization, session_id=test_session.session_id)
        refused = DeliveryResult(ok=False, reason="window_expired", can_template=True)
        with patch("app.services.ticket.deliver_to_customer", return_value=refused) as deliver:
            await service.send_customer_message(ticket, "Your refund is on its way")

        row = db.query(ChatHistory).filter_by(session_id=test_session.session_id).one()
        assert deliver.await_args.kwargs["message_id"] == row.id
        assert row.attributes["delivery_status"] == "window_expired"
        assert ticket.first_response_at is None
        assert TicketActivityType.CUSTOMER_NOTIFIED.value not in [
            activity.activity_type
            for activity in service.activity_repo.list_for_ticket(ticket.id)
        ]

    @pytest.mark.asyncio
    async def test_refused_channel_reply_preserves_an_existing_first_response(
        self, service, db, test_organization, test_session
    ):
        test_session.channel = "whatsapp"
        db.commit()
        ticket = make_ticket(service, db, test_organization, session_id=test_session.session_id)
        prior_response = datetime(2026, 10, 1, tzinfo=timezone.utc)
        ticket.first_response_at = prior_response
        db.commit()
        db.refresh(ticket)
        prior_response = ticket.first_response_at
        refused = DeliveryResult(ok=False, reason="window_expired", can_template=True)

        with patch("app.services.ticket.deliver_to_customer", return_value=refused):
            await service.send_customer_message(ticket, "Your refund is on its way")

        assert ticket.first_response_at == prior_response
        assert TicketActivityType.CUSTOMER_NOTIFIED.value not in [
            activity.activity_type
            for activity in service.activity_repo.list_for_ticket(ticket.id)
        ]

    @pytest.mark.asyncio
    async def test_a_send_that_raises_is_marked_undelivered(
        self, service, db, test_organization, test_session
    ):
        test_session.channel = "whatsapp"
        db.commit()
        ticket = make_ticket(service, db, test_organization, session_id=test_session.session_id)
        with patch("app.services.ticket.deliver_to_customer", side_effect=RuntimeError("graph down")):
            await service.send_customer_message(ticket, "Your refund is on its way")

        row = db.query(ChatHistory).filter_by(session_id=test_session.session_id).one()
        assert row.attributes["delivery_status"] == "send_failed"

    @pytest.mark.asyncio
    async def test_no_contact_is_a_silent_noop(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        with patch(
            "app.services.ticket_email.send_ticket_email", return_value=True
        ) as send:
            await service.send_customer_message(ticket, "hello?")
        send.assert_not_awaited()
        types = [a.activity_type for a in service.activity_repo.list_for_ticket(ticket.id)]
        assert TicketActivityType.CUSTOMER_NOTIFIED.value not in types

    @pytest.mark.asyncio
    async def test_failed_send_records_nothing(self, service, db, test_organization):
        ticket = make_ticket(
            service, db, test_organization, customer_email="c@example.com"
        )
        with patch("app.services.ticket_email.send_ticket_email", return_value=False):
            await service.send_customer_message(ticket, "We are on it")
        types = [a.activity_type for a in service.activity_repo.list_for_ticket(ticket.id)]
        assert TicketActivityType.CUSTOMER_NOTIFIED.value not in types
        assert ticket.first_response_at is None

    @pytest.mark.asyncio
    async def test_repeat_resolve_notifies_customer_once(
        self, service, db, test_organization, test_session
    ):
        """A double-submitted resolve must send the customer exactly one
        resolution message — the second call is a no-op transition and must not
        re-notify."""
        ticket = make_ticket(
            service, db, test_organization, session_id=test_session.session_id
        )
        with patch.object(
            service, "notify_customer_resolved"
        ) as notify:
            await service.resolve(ticket, outcome="fixed", customer_message="All set")
            await service.resolve(ticket, outcome="fixed", customer_message="All set")
        notify.assert_awaited_once()


class TestStatusMachine:
    def test_legal_transition(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.IN_PROGRESS)
        assert ticket.status == TicketStatus.IN_PROGRESS

    def test_illegal_transition_raises(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.CLOSED)
        with pytest.raises(ValueError, match="Illegal status transition"):
            service.transition_status(ticket, TicketStatus.IN_PROGRESS)

    def test_resolved_sets_timestamps_and_actor(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.RESOLVED, actor_type=TicketActorType.AI)
        assert ticket.resolved_at is not None
        assert ticket.resolved_by_actor == "ai"

    def test_reopen_clears_resolution_state(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.RESOLVED)
        service.reopen(ticket, reason="Customer says still broken")
        assert ticket.status == TicketStatus.REOPENED
        assert ticket.resolved_at is None
        assert ticket.resolved_by_actor is None
        assert ticket.reopened_count == 1

    def test_transition_writes_audit_row(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.IN_PROGRESS)
        activities = service.activity_repo.list_for_ticket(ticket.id)
        last = activities[-1]
        assert last.activity_metadata == {
            "from": TicketStatus.OPEN.value,
            "to": TicketStatus.IN_PROGRESS.value,
        }


class TestComments:
    def test_customer_visible_comment_sets_first_response(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        assert ticket.first_response_at is None
        service.add_comment(ticket, "Looking into it", is_internal=False)
        assert ticket.first_response_at is not None

    def test_internal_note_does_not_set_first_response(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        service.add_comment(ticket, "internal note", is_internal=True)
        assert ticket.first_response_at is None


class TestAiState:
    def test_active_run_means_investigating(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        assert service.ai_state(ticket) == "investigating"

    def test_no_run_means_human(self, service, db, test_organization):
        settings = service.settings_repo.get_or_create(test_organization.id)
        settings.auto_investigate_on_create = False
        db.commit()
        ticket = make_ticket(service, db, test_organization)
        assert service.ai_state(ticket) == "human"

    def test_ai_resolution_means_resolved(self, service, db, test_organization):
        settings = service.settings_repo.get_or_create(test_organization.id)
        settings.auto_investigate_on_create = False
        db.commit()
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.RESOLVED, actor_type=TicketActorType.AI)
        assert service.ai_state(ticket) == "resolved"


class TestRunGuards:
    def test_only_one_active_run_per_ticket(self, service, db, test_organization):
        ticket = make_ticket(service, db, test_organization)
        # Auto-created triage run is still pending — a second enqueue is refused.
        assert service.enqueue_run(ticket) is None


class TestStats:
    def test_stats_counts(self, service, db, test_organization):
        make_ticket(service, db, test_organization)
        ticket = make_ticket(service, db, test_organization)
        service.transition_status(ticket, TicketStatus.AWAITING_APPROVAL)
        db.commit()
        stats = service.stats(test_organization.id)
        assert stats["open"] == 2
        assert stats["awaiting_approval"] == 1


class TestTemplates:
    def test_placeholders_render(self):
        rendered = render_customer_template("Hi [customer] — [ticket] is open.", "Ada", "TKT-7")
        assert rendered == "Hi Ada — TKT-7 is open."

    def test_missing_customer_name_falls_back(self):
        rendered = render_customer_template("Hi [customer]!", None, "TKT-7")
        assert rendered == "Hi there!"