from __future__ import annotations

import io
import os
from datetime import datetime
from pathlib import Path

import pytest

import nanobot.webui.session_list_index as session_list_index
from nanobot.cron.session_turns import CRON_HISTORY_META
from nanobot.providers.base import ProviderConversationState
from nanobot.security.workspace_access import WORKSPACE_SCOPE_METADATA_KEY
from nanobot.session.automation_turns import AUTOMATION_HISTORY_META
from nanobot.session.history_visibility import HIDDEN_HISTORY_META
from nanobot.session.manager import SessionManager
from nanobot.session.model_selection import SESSION_MODEL_PRESET_METADATA_KEY


def test_webui_session_list_reuses_valid_index_without_scanning_files(
    tmp_path: Path,
    monkeypatch,
) -> None:
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:indexed")
    session.metadata[SESSION_MODEL_PRESET_METADATA_KEY] = "fast"
    session.add_message("user", "indexed preview")
    manager.save(session)

    assert list_webui_sessions(manager)[0]["preview"] == "indexed preview"
    assert list_webui_sessions(manager)[0]["model_preset"] == "fast"

    def fail_scan(session_manager: SessionManager, path: Path, webui_dir: Path) -> None:
        raise AssertionError(f"unexpected session file scan: {path}")

    monkeypatch.setattr(session_list_index, "_scan_session_row", fail_scan)

    rows = list_webui_sessions(manager)

    assert rows[0]["key"] == "websocket:indexed"
    assert rows[0]["preview"] == "indexed preview"
    assert rows[0]["model_preset"] == "fast"


def test_webui_session_list_indexes_workspace_scope_and_preserves_null(
    tmp_path: Path,
) -> None:
    manager = SessionManager(tmp_path)
    project = tmp_path / "project"
    project.mkdir()

    scoped = manager.get_or_create("websocket:scoped")
    scoped.metadata[WORKSPACE_SCOPE_METADATA_KEY] = {
        "project_path": str(project),
        "access_mode": "full",
        "future_extension": "x" * 5000,
    }
    manager.save(scoped)
    explicit_null = manager.get_or_create("websocket:null")
    explicit_null.metadata[WORKSPACE_SCOPE_METADATA_KEY] = None
    manager.save(explicit_null)
    manager.save(manager.get_or_create("websocket:missing"))

    rows = {row["key"]: row for row in list_webui_sessions(manager)}

    assert session_list_index.indexed_workspace_scope(rows["websocket:scoped"]) == (
        True,
        {"project_path": str(project), "access_mode": "full"},
    )
    assert session_list_index.indexed_workspace_scope(rows["websocket:null"]) == (True, None)
    assert session_list_index.indexed_workspace_scope(rows["websocket:missing"]) == (False, None)

    scoped.metadata[WORKSPACE_SCOPE_METADATA_KEY]["access_mode"] = "restricted"
    manager.save(scoped)

    refreshed = {row["key"]: row for row in list_webui_sessions(manager)}
    assert session_list_index.indexed_workspace_scope(refreshed["websocket:scoped"])[1] == {
        "project_path": str(project),
        "access_mode": "restricted",
    }


def test_webui_session_list_does_not_cache_old_snapshot_with_new_signature(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    manager = SessionManager(tmp_path)
    session_key = "websocket:scope-race"
    session = manager.get_or_create(session_key)
    session.metadata[WORKSPACE_SCOPE_METADATA_KEY] = {
        "project_path": str(tmp_path),
        "access_mode": "full",
    }
    session.add_message("user", "hello")
    manager.save(session)
    session_path = manager._get_session_path(session_key)
    original_open = open
    scope_changed = False

    class RacingReader(io.StringIO):
        def __next__(self) -> str:
            nonlocal scope_changed
            if not scope_changed:
                scope_changed = True
                current = manager.get_or_create(session_key)
                current.metadata[WORKSPACE_SCOPE_METADATA_KEY] = {
                    "project_path": str(tmp_path),
                    "access_mode": "restricted",
                }
                manager.save(current)
            return super().__next__()

    def racing_open(path, *args, **kwargs):
        if Path(path) == session_path:
            with original_open(path, *args, **kwargs) as source:
                return RacingReader(source.read())
        return original_open(path, *args, **kwargs)

    monkeypatch.setattr(session_list_index, "open", racing_open, raising=False)

    first = list_webui_sessions(manager)[0]
    second = list_webui_sessions(manager)[0]

    assert session_list_index.indexed_workspace_scope(first)[1]["access_mode"] == "full"
    assert session_list_index.indexed_workspace_scope(second)[1]["access_mode"] == "restricted"


def test_webui_session_list_rejects_invalid_internal_model_preset_metadata(
    tmp_path: Path,
) -> None:
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:custom-metadata")
    session.metadata["model_preset"] = 7
    session.metadata[SESSION_MODEL_PRESET_METADATA_KEY] = {"invalid": True}
    session.add_message("user", "custom metadata")
    manager.save(session)

    with pytest.raises(ValueError, match="session model preset must be a non-empty string"):
        list_webui_sessions(manager)

    assert manager.get_or_create(session.key).metadata["model_preset"] == 7


def test_webui_session_list_rescans_only_changed_file(tmp_path: Path, monkeypatch) -> None:
    manager = SessionManager(tmp_path)
    first = manager.get_or_create("websocket:first")
    first.add_message("user", "first")
    manager.save(first)
    second = manager.get_or_create("websocket:second")
    second.add_message("user", "second before")
    manager.save(second)

    assert {row["preview"] for row in list_webui_sessions(manager)} == {"first", "second before"}

    second.messages.clear()
    second.add_message("user", "second after")
    manager.save(second)

    original_scan = session_list_index._scan_session_row
    scanned: list[str] = []

    def record_scan(
        session_manager: SessionManager,
        path: Path,
        webui_dir: Path,
    ) -> dict | None:
        scanned.append(path.name)
        return original_scan(session_manager, path, webui_dir)

    monkeypatch.setattr(session_list_index, "_scan_session_row", record_scan)

    rows = list_webui_sessions(manager)

    assert scanned == [manager._get_session_path("websocket:second").name]
    assert {row["preview"] for row in rows} == {"first", "second after"}


def test_webui_session_list_skips_provider_state_before_preview_budget(
    tmp_path: Path,
    monkeypatch,
) -> None:
    monkeypatch.setattr(session_list_index, "_SESSION_LIST_PREVIEW_MAX_CHARS", 100)
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:private-state")
    session.provider_state = ProviderConversationState(
        kind="openai_responses",
        provider="openai:test",
        model="test-model",
        version=1,
        payload={"items": [{"encrypted_content": "x" * 200}]},
    )
    session.add_message("user", "visible preview")
    manager.save(session)

    assert list_webui_sessions(manager)[0]["preview"] == "visible preview"


def test_webui_session_list_drops_deleted_index_rows(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:deleted")
    session.add_message("user", "gone")
    manager.save(session)

    assert list_webui_sessions(manager)[0]["key"] == "websocket:deleted"

    assert manager.delete_session("websocket:deleted") is True

    assert list_webui_sessions(manager) == []


def test_webui_session_list_ignores_legacy_stem(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    legacy_path = manager.sessions_dir / "websocket_legacy.jsonl"
    legacy_path.write_text(
        '{"_type":"metadata","key":"websocket:legacy",'
        '"created_at":"2025-01-01T00:00:00",'
        '"updated_at":"2025-01-01T00:00:00","metadata":{}}\n',
        encoding="utf-8",
    )

    assert list_webui_sessions(manager) == []
    assert legacy_path.exists()


def test_webui_session_list_skips_cron_internal_user_preview(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:cron-preview")
    session.add_message(
        "user",
        "Scheduled cron job triggered: 30s-test\n\nInternal reminder prompt",
        **{CRON_HISTORY_META: True},
    )
    session.add_message("assistant", "提醒已经到期。")
    manager.save(session)

    assert list_webui_sessions(manager)[0]["preview"] == "提醒已经到期。"


def test_webui_session_list_skips_trigger_internal_user_preview(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:trigger-preview")
    session.add_message(
        "user",
        "Local trigger received: PR review",
        **{AUTOMATION_HISTORY_META: {"kind": "local_trigger", "trigger_id": "trg_123"}},
    )
    session.add_message("assistant", "PR #4502 已经开始 review。")
    manager.save(session)

    assert list_webui_sessions(manager)[0]["preview"] == "PR #4502 已经开始 review。"


def test_webui_session_list_skips_hidden_history_user_preview(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:hidden-preview")
    session.add_message(
        "user",
        "internal subagent result",
        **{HIDDEN_HISTORY_META: {"kind": "subagent_result", "subagent_task_id": "sub-1"}},
    )
    session.add_message("assistant", "subagent summary")
    manager.save(session)

    assert list_webui_sessions(manager)[0]["preview"] == "subagent summary"


def test_webui_session_list_uses_webui_transcript_activity_for_sort(
    tmp_path: Path,
    monkeypatch,
) -> None:
    webui_dir = tmp_path / "webui"
    webui_dir.mkdir()
    monkeypatch.setattr(session_list_index, "get_webui_dir", lambda: webui_dir)

    manager = SessionManager(tmp_path)
    old_session = manager.get_or_create("websocket:old-metadata")
    old_session.created_at = datetime(2026, 6, 15, 10, 0, 0)
    old_session.updated_at = datetime(2026, 6, 15, 10, 0, 0)
    old_session.add_message("user", "old metadata")
    old_session.messages[-1]["timestamp"] = "2026-06-15T10:00:00"
    old_session.updated_at = datetime(2026, 6, 15, 10, 0, 0)
    manager.save(old_session)

    newer_metadata = manager.get_or_create("websocket:newer-metadata")
    newer_metadata.created_at = datetime(2026, 6, 15, 11, 0, 0)
    newer_metadata.updated_at = datetime(2026, 6, 15, 11, 0, 0)
    newer_metadata.add_message("user", "newer metadata")
    newer_metadata.messages[-1]["timestamp"] = "2026-06-15T11:00:00"
    newer_metadata.updated_at = datetime(2026, 6, 15, 11, 0, 0)
    manager.save(newer_metadata)

    transcript = webui_dir / "websocket_old-metadata.jsonl"
    transcript.write_text(
        '{"event":"turn_end","chat_id":"old-metadata"}\n',
        encoding="utf-8",
    )
    activity_ns = int(datetime(2026, 6, 15, 12, 0, 0).timestamp() * 1_000_000_000)
    os.utime(transcript, ns=(activity_ns, activity_ns))

    rows = list_webui_sessions(manager)

    assert [row["key"] for row in rows] == [
        "websocket:old-metadata",
        "websocket:newer-metadata",
    ]
    assert rows[0]["updated_at"].startswith("2026-06-15T12:00:00")


def test_webui_session_list_rescans_when_transcript_changes(
    tmp_path: Path,
    monkeypatch,
) -> None:
    webui_dir = tmp_path / "webui"
    webui_dir.mkdir()
    monkeypatch.setattr(session_list_index, "get_webui_dir", lambda: webui_dir)

    manager = SessionManager(tmp_path)
    session = manager.get_or_create("websocket:transcript-change")
    session.created_at = datetime(2026, 6, 15, 10, 0, 0)
    session.updated_at = datetime(2026, 6, 15, 10, 0, 0)
    session.add_message("user", "preview")
    session.messages[-1]["timestamp"] = "2026-06-15T10:00:00"
    session.updated_at = datetime(2026, 6, 15, 10, 0, 0)
    manager.save(session)

    assert list_webui_sessions(manager)[0]["preview"] == "preview"

    transcript = webui_dir / "websocket_transcript-change.jsonl"
    transcript.write_text(
        '{"event":"turn_end","chat_id":"transcript-change"}\n',
        encoding="utf-8",
    )
    activity_ns = int(datetime(2026, 6, 15, 12, 30, 0).timestamp() * 1_000_000_000)
    os.utime(transcript, ns=(activity_ns, activity_ns))

    original_scan = session_list_index._scan_session_row
    scanned: list[str] = []

    def record_scan(
        session_manager: SessionManager,
        path: Path,
        webui_dir: Path,
    ) -> dict | None:
        scanned.append(path.name)
        return original_scan(session_manager, path, webui_dir)

    monkeypatch.setattr(session_list_index, "_scan_session_row", record_scan)

    rows = list_webui_sessions(manager)

    assert scanned == [manager._get_session_path("websocket:transcript-change").name]
    assert rows[0]["updated_at"].startswith("2026-06-15T12:30:00")


def test_webui_session_list_sorts_by_message_activity_not_maintenance_timestamp(
    tmp_path: Path,
) -> None:
    manager = SessionManager(tmp_path)
    old = manager.get_or_create("websocket:old")
    old.created_at = datetime(2026, 6, 1, 10, 0, 0)
    old.add_message("user", "old first visible activity")
    old.messages[-1]["timestamp"] = "2026-06-01T10:00:00"
    old.add_message("assistant", "automation result")
    old.messages[-1]["timestamp"] = "2026-06-05T10:00:00"
    old.updated_at = datetime(2026, 6, 30, 17, 40, 0)
    manager.save(old)

    newer = manager.get_or_create("websocket:newer")
    newer.created_at = datetime(2026, 6, 4, 10, 0, 0)
    newer.add_message("user", "newer real activity")
    newer.messages[-1]["timestamp"] = "2026-06-04T10:00:00"
    newer.updated_at = datetime(2026, 6, 4, 10, 0, 0)
    manager.save(newer)

    rows = list_webui_sessions(manager)

    assert [row["key"] for row in rows] == ["websocket:old", "websocket:newer"]
    assert rows[0]["updated_at"] == "2026-06-05T10:00:00"


def list_webui_sessions(manager: SessionManager) -> list[dict]:
    return session_list_index.list_webui_sessions(manager)


def test_webui_session_list_fallback_time_when_missing(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    path = manager._get_session_path("websocket:missing-time")
    path.write_text(
        '{"_type": "metadata", "key": "websocket:missing-time"}\n'
        '{"_type": "message", "role": "user", "content": "hello"}\n',
        encoding="utf-8",
    )

    rows = list_webui_sessions(manager)
    assert len(rows) == 1
    assert rows[0]["key"] == "websocket:missing-time"
    assert rows[0]["created_at"] is not None
    assert rows[0]["updated_at"] is not None
    datetime.fromisoformat(rows[0]["created_at"])
    datetime.fromisoformat(rows[0]["updated_at"])


def test_session_manager_list_sessions_fallback_time_when_missing(tmp_path: Path) -> None:
    manager = SessionManager(tmp_path)
    path = manager._get_session_path("websocket:missing-time2")
    path.write_text(
        '{"_type": "metadata", "key": "websocket:missing-time2"}\n'
        '{"_type": "message", "role": "user", "content": "hello"}\n',
        encoding="utf-8",
    )

    sessions = manager.list_sessions()
    assert len(sessions) == 1
    assert sessions[0]["key"] == "websocket:missing-time2"
    assert sessions[0]["created_at"] is not None
    assert sessions[0]["updated_at"] is not None
    datetime.fromisoformat(sessions[0]["created_at"])
    datetime.fromisoformat(sessions[0]["updated_at"])