"""
Session monitoring and management endpoints.
[AC-ASA-07, AC-ASA-09] Session list and detail monitoring.
"""

import logging
from typing import Annotated, Optional
from datetime import datetime

from fastapi import APIRouter, Depends, Query
from fastapi.responses import JSONResponse

from app.core.tenant import get_tenant_id
from app.models import ErrorResponse

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/admin/sessions", tags=["Session Monitoring"])


@router.get(
    "",
    operation_id="listSessions",
    summary="Query session list",
    description="[AC-ASA-09] Get list of sessions with pagination and filtering.",
    responses={
        200: {"description": "Session list with pagination"},
        401: {"description": "Unauthorized", "model": ErrorResponse},
        403: {"description": "Forbidden", "model": ErrorResponse},
    },
)
async def list_sessions(
    tenant_id: Annotated[str, Depends(get_tenant_id)],
    status: Annotated[Optional[str], Query()] = None,
    start_time: Annotated[Optional[str], Query(alias="startTime")] = None,
    end_time: Annotated[Optional[str], Query(alias="endTime")] = None,
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
) -> JSONResponse:
    """
    [AC-ASA-09] List sessions with filtering and pagination.
    """
    logger.info(
        f"[AC-ASA-09] Listing sessions: tenant={tenant_id}, status={status}, "
        f"start_time={start_time}, end_time={end_time}, page={page}, page_size={page_size}"
    )

    mock_sessions = [
        {
            "sessionId": "kf_001_wx123456_1708765432000",
            "status": "active",
            "startTime": "2026-02-24T10:00:00Z",
            "endTime": None,
            "messageCount": 15,
        },
        {
            "sessionId": "kf_002_wx789012_1708851832000",
            "status": "closed",
            "startTime": "2026-02-23T14:30:00Z",
            "endTime": "2026-02-23T15:45:00Z",
            "messageCount": 8,
        },
        {
            "sessionId": "kf_003_wx345678_1708938232000",
            "status": "expired",
            "startTime": "2026-02-22T09:00:00Z",
            "endTime": "2026-02-23T09:00:00Z",
            "messageCount": 3,
        },
        {
            "sessionId": "kf_004_wx901234_1709024632000",
            "status": "active",
            "startTime": "2026-02-21T16:00:00Z",
            "endTime": None,
            "messageCount": 22,
        },
        {
            "sessionId": "kf_005_wx567890_1709111032000",
            "status": "closed",
            "startTime": "2026-02-20T11:00:00Z",
            "endTime": "2026-02-20T12:30:00Z",
            "messageCount": 12,
        },
    ]

    filtered = mock_sessions
    if status:
        filtered = [s for s in filtered if s["status"] == status]

    total = len(filtered)
    total_pages = (total + page_size - 1) // page_size

    return JSONResponse(
        content={
            "data": filtered,
            "pagination": {
                "page": page,
                "pageSize": page_size,
                "total": total,
                "totalPages": total_pages,
            },
        }
    )


@router.get(
    "/{session_id}",
    operation_id="getSessionDetail",
    summary="Get session details",
    description="[AC-ASA-07] Get full session details with messages and trace.",
    responses={
        200: {"description": "Full session details with messages and trace"},
        401: {"description": "Unauthorized", "model": ErrorResponse},
        403: {"description": "Forbidden", "model": ErrorResponse},
    },
)
async def get_session_detail(
    tenant_id: Annotated[str, Depends(get_tenant_id)],
    session_id: str,
) -> JSONResponse:
    """
    [AC-ASA-07] Get session detail with messages and trace information.
    """
    logger.info(
        f"[AC-ASA-07] Getting session detail: tenant={tenant_id}, session_id={session_id}"
    )

    mock_session = {
        "sessionId": session_id,
        "messages": [
            {
                "role": "user",
                "content": "我想了解产品价格",
                "timestamp": "2026-02-24T10:00:00Z",
            },
            {
                "role": "assistant",
                "content": "您好，我们的产品价格根据套餐不同有所差异。基础版每月99元，专业版每月299元。企业版提供定制化服务。",
                "timestamp": "2026-02-24T10:00:05Z",
            },
            {
                "role": "user",
                "content": "专业版包含哪些功能？",
                "timestamp": "2026-02-24T10:00:30Z",
            },
            {
                "role": "assistant",
                "content": "专业版包含：高级数据分析、API 接入、优先技术支持、自定义报表等功能。",
                "timestamp": "2026-02-24T10:00:35Z",
            },
        ],
        "trace": {
            "retrieval": [
                {
                    "query": "产品价格",
                    "kbIds": ["kb_products"],
                    "results": [
                        {"source": "pricing.pdf", "score": 0.92, "content": "..."}
                    ],
                }
            ],
            "tools": [],
            "errors": [],
        },
    }

    return JSONResponse(content=mock_session)