"""E2E coverage for session.eventLog RPC methods."""

from __future__ import annotations

import asyncio
import time
import uuid
from collections.abc import Awaitable, Callable

import pytest

from copilot.generated.rpc import (
    EventLogReadRequest,
    EventsCursorStatus,
    NameSetRequest,
    PlanUpdateRequest,
    RegisterEventInterestParams,
    ReleaseEventInterestParams,
)
from copilot.generated.session_events import (
    PlanChangedOperation,
    SessionPlanChangedData,
    SessionTitleChangedData,
)
from copilot.session import PermissionHandler

from .testharness import E2ETestContext

pytestmark = pytest.mark.asyncio(loop_scope="module")


async def _wait_for(
    predicate: Callable[[], Awaitable[bool]],
    *,
    timeout: float = 30.0,
    message: str,
) -> None:
    deadline = time.monotonic() + timeout
    while time.monotonic() < deadline:
        if await predicate():
            return
        await asyncio.sleep(0.2)
    pytest.fail(message)


class TestRpcEventLog:
    async def test_should_read_persisted_events_from_beginning(self, ctx: E2ETestContext):
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        try:
            await session.rpc.plan.update(
                PlanUpdateRequest(content="# Event log E2E plan\n- persisted event")
            )

            observed = None

            async def has_plan_event() -> bool:
                nonlocal observed
                observed = await session.rpc.event_log.read(EventLogReadRequest(max=100, wait_ms=0))
                return any(
                    isinstance(evt.data, SessionPlanChangedData)
                    and evt.data.operation == PlanChangedOperation.CREATE
                    and evt.ephemeral is not True
                    for evt in observed.events
                )

            await _wait_for(
                has_plan_event,
                message="Timed out waiting for persisted session.plan_changed event.",
            )

            assert observed is not None
            assert observed.cursor_status == EventsCursorStatus.OK
            assert observed.cursor
            assert any(
                isinstance(evt.data, SessionPlanChangedData)
                and evt.data.operation == PlanChangedOperation.CREATE
                for evt in observed.events
            )
        finally:
            await session.disconnect()

    async def test_should_return_tail_cursor_and_read_empty_when_no_new_events(
        self, ctx: E2ETestContext
    ):
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        try:
            tail = await session.rpc.event_log.tail()
            read = await session.rpc.event_log.read(
                EventLogReadRequest(cursor=tail.cursor, max=10, wait_ms=0)
            )

            assert tail.cursor
            assert read.cursor_status == EventsCursorStatus.OK
            assert read.events == []
            assert read.has_more is False
        finally:
            await session.disconnect()

    async def test_should_register_and_release_event_interest_idempotently(
        self, ctx: E2ETestContext
    ):
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        try:
            registered = await session.rpc.event_log.register_interest(
                RegisterEventInterestParams(event_type="session.title_changed")
            )
            assert registered.handle

            released = await session.rpc.event_log.release_interest(
                ReleaseEventInterestParams(handle=registered.handle)
            )
            assert released.success is True

            released_again = await session.rpc.event_log.release_interest(
                ReleaseEventInterestParams(handle=registered.handle)
            )
            assert released_again.success is True
        finally:
            await session.disconnect()

    async def test_should_long_poll_with_types_filter_for_title_changed_event(
        self, ctx: E2ETestContext
    ):
        session = await ctx.client.create_session(
            on_permission_request=PermissionHandler.approve_all,
        )
        try:
            expected_title = f"EventLogTitle-{uuid.uuid4().hex}"
            tail = await session.rpc.event_log.tail()
            read_task = asyncio.create_task(
                session.rpc.event_log.read(
                    EventLogReadRequest(
                        cursor=tail.cursor,
                        max=10,
                        wait_ms=5000,
                        types=["session.title_changed"],
                    )
                )
            )

            await session.rpc.name.set(NameSetRequest(name=expected_title))
            read = await asyncio.wait_for(read_task, timeout=10.0)

            assert read.cursor_status == EventsCursorStatus.OK
            assert all(evt.type.value == "session.title_changed" for evt in read.events)
            assert any(
                isinstance(evt.data, SessionTitleChangedData) and evt.data.title == expected_title
                for evt in read.events
            )
        finally:
            await session.disconnect()