# =============================================================================
# 企微IT智能服务台 — 知识库自动迭代 API（Tier1 扩展）
# =============================================================================
# 说明：知识库自动迭代相关接口（扩展版）。
#   1. POST /api/admin/knowledge-iteration/analyze - 触发分析并生成建议
#   2. GET /api/admin/knowledge-iteration/suggestions - 获取建议列表（支持 audience/confidence 筛选）
#   3. GET /api/admin/knowledge-iteration/suggestions/{id} - 获取建议详情
#   4. POST /api/admin/knowledge-iteration/suggestions/{id}/approve - 审核通过（触发Neo4j写图）
#   5. POST /api/admin/knowledge-iteration/suggestions/{id}/reject - 审核拒绝
#   6. POST /api/admin/knowledge-iteration/suggestions/{id}/rewrite - 改写提案（Tier1新增）
#   7. POST /api/admin/knowledge-iteration/suggestions/{id}/queue - 放入独立队列（Tier1新增）
#   8. POST /api/admin/knowledge-iteration/suggestions/{id}/dequeue-approve - 队列中审批（Tier1新增）
#   9. GET /api/admin/knowledge-iteration/stats - 获取统计
# =============================================================================

import logging
from typing import Optional

from fastapi import APIRouter, Depends, Query
from sqlalchemy.ext.asyncio import AsyncSession

from app.database import get_db
from app.dependencies import get_current_user, require_admin, UserInfo
from app.models.knowledge_suggestion import KnowledgeSuggestion
from app.schemas.knowledge_suggestion import (
    KnowledgeSuggestionListResponse,
    KnowledgeSuggestionResponse,
    KnowledgeSuggestionStatsResponse,
    KnowledgeSuggestionApprove,
    KnowledgeSuggestionReject,
    KnowledgeSuggestionRewrite,
    KnowledgeSuggestionMerge,
)
from app.services.knowledge_iteration_service import (
    KnowledgeIterationService,
    dep_knowledge_iteration_service,
)
from app.services.neo4j_client import get_neo4j_client

logger = logging.getLogger(__name__)

router = APIRouter()


# -----------------------------------------------------------------------------
# 触发分析
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/analyze
@router.post("/analyze")
@require_admin
async def trigger_analysis(
    days: int = Query(default=7, ge=1, le=90, description="分析过去N天的数据"),
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """触发知识库迭代分析。

    分析过去N天的标注数据和会话数据，调用 Dify AI 自动生成优化建议。

    - **days**: 分析过去N天的数据（默认7天，最大90天）

    **需要管理员权限。**
    """
    logger.info(f"管理员 {current_user.name} 触发了知识库迭代分析, days={days}")

    result = await service.analyze_and_generate_suggestions(db, days=days)

    return {
        "code": 0,
        "message": "分析完成",
        "data": result,
    }


# -----------------------------------------------------------------------------
# 获取建议列表（Tier1 扩展：audience/confidence 筛选）
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/suggestions
@router.get("/suggestions")
@require_admin
async def list_suggestions(
    status: Optional[str] = Query(default=None, description="筛选状态：pending/queued/approved/rejected/applied/graph_synced/expired"),
    suggestion_type: Optional[str] = Query(default=None, description="筛选类型：new_faq/update/outdated"),
    audience: Optional[str] = Query(default=None, description="筛选受众：employee_quick_reply/engineer_workguide"),
    confidence_min: Optional[float] = Query(default=None, ge=0.0, le=1.0, description="置信度下限"),
    confidence_max: Optional[float] = Query(default=None, ge=0.0, le=1.0, description="置信度上限"),
    page: int = Query(default=1, ge=1, description="页码"),
    page_size: int = Query(default=20, ge=1, le=100, description="每页数量"),
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """获取知识库优化建议列表（Tier1 扩展：支持 audience/confidence 筛选）。

    - **status**: 筛选状态
    - **suggestion_type**: 筛选类型
    - **audience**: 按受众类型筛选（Tier1 新增）
    - **confidence_min**: 置信度下限（Tier1 新增）
    - **confidence_max**: 置信度上限（Tier1 新增）
    - **page**: 页码
    - **page_size**: 每页数量

    **需要管理员权限。**
    """
    from sqlalchemy import select, func

    # 构建查询
    stmt = select(KnowledgeSuggestion).order_by(
        KnowledgeSuggestion.created_at.desc()
    )

    if status:
        stmt = stmt.where(KnowledgeSuggestion.status == status)
    if suggestion_type:
        stmt = stmt.where(KnowledgeSuggestion.suggestion_type == suggestion_type)
    if audience:
        stmt = stmt.where(KnowledgeSuggestion.audience == audience)
    if confidence_min is not None:
        stmt = stmt.where(KnowledgeSuggestion.confidence >= confidence_min)
    if confidence_max is not None:
        stmt = stmt.where(KnowledgeSuggestion.confidence <= confidence_max)

    # 分页
    offset = (page - 1) * page_size
    stmt = stmt.offset(offset).limit(page_size)

    result = await db.execute(stmt)
    suggestions = result.scalars().all()

    # 统计总数
    count_stmt = select(func.count()).select_from(KnowledgeSuggestion)
    if status:
        count_stmt = count_stmt.where(KnowledgeSuggestion.status == status)
    if suggestion_type:
        count_stmt = count_stmt.where(
            KnowledgeSuggestion.suggestion_type == suggestion_type
        )
    if audience:
        count_stmt = count_stmt.where(KnowledgeSuggestion.audience == audience)
    if confidence_min is not None:
        count_stmt = count_stmt.where(KnowledgeSuggestion.confidence >= confidence_min)
    if confidence_max is not None:
        count_stmt = count_stmt.where(KnowledgeSuggestion.confidence <= confidence_max)

    total_result = await db.execute(count_stmt)
    total = total_result.scalar()

    return {
        "code": 0,
        "message": "success",
        "data": {
            "total": total,
            "items": [
                KnowledgeSuggestionResponse.model_validate(s) for s in suggestions
            ],
        },
    }


# -----------------------------------------------------------------------------
# 获取建议详情
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/suggestions/{id}
@router.get("/suggestions/{suggestion_id}")
@require_admin
async def get_suggestion(
    suggestion_id: str,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """获取知识库优化建议详情。

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    from sqlalchemy import select

    stmt = select(KnowledgeSuggestion).where(
        KnowledgeSuggestion.id == suggestion_id
    )
    result = await db.execute(stmt)
    suggestion = result.scalar_one_or_none()

    if not suggestion:
        return {"code": 404, "message": "建议不存在", "data": None}

    return {
        "code": 0,
        "message": "success",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 审核通过（Tier1 扩展：串联 Neo4j 写图）
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/approve
@router.post("/suggestions/{suggestion_id}/approve")
@require_admin
async def approve_suggestion(
    suggestion_id: str,
    body: KnowledgeSuggestionApprove,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """审核通过知识库优化建议（Tier1：串联 Neo4j 写图 + 五态流转）。

    审核通过后：
    1. 状态 pending/queued → approved → applied → graph_synced
    2. 自动创建 KnowledgeBase 条目（派生视图）
    3. 触发 Neo4j 图写入（D1 解读2 合一）

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    logger.info(
        f"管理员 {current_user.name} 审核通过建议: {suggestion_id}"
    )

    # 尝试获取 Neo4j 客户端（可选，不影响审批主流程）
    neo4j_client = await get_neo4j_client()

    suggestion = await service.approve_suggestion(
        db, suggestion_id, current_user.employee_id,
        neo4j_client=neo4j_client,
    )

    if not suggestion:
        return {"code": 404, "message": "建议不存在或状态转换无效", "data": None}

    return {
        "code": 0,
        "message": "审核通过，建议已应用到知识库并同步至知识图谱",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 审核拒绝
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/reject
@router.post("/suggestions/{suggestion_id}/reject")
@require_admin
async def reject_suggestion(
    suggestion_id: str,
    body: KnowledgeSuggestionReject,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """拒绝知识库优化建议。

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    logger.info(
        f"管理员 {current_user.name} 拒绝建议: {suggestion_id}, "
        f"理由: {body.reject_reason}"
    )

    suggestion = await service.reject_suggestion(
        db, suggestion_id, current_user.employee_id, body.reject_reason
    )

    if not suggestion:
        return {"code": 404, "message": "建议不存在", "data": None}

    return {
        "code": 0,
        "message": "已拒绝该建议",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 改写提案（Tier1 新增 — D7 内联审批改写）
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/rewrite
@router.post("/suggestions/{suggestion_id}/rewrite")
@require_admin
async def rewrite_suggestion(
    suggestion_id: str,
    body: KnowledgeSuggestionRewrite,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """训练师改写知识库优化建议（Tier1 新增）。

    改写后提案状态重置为 pending，重新走审批流程。
    可修改字段：title、content、category、tags、confidence、audience、
    issue、action、relation_type、parent_issue。

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    logger.info(
        f"管理员 {current_user.name} 改写建议: {suggestion_id}"
    )

    # 将非 None 的字段收集为改写数据
    rewrite_data = body.model_dump(exclude_none=True, exclude_unset=True)

    suggestion = await service.rewrite_suggestion(
        db, suggestion_id, current_user.employee_id, rewrite_data
    )

    if not suggestion:
        return {"code": 404, "message": "建议不存在", "data": None}

    return {
        "code": 0,
        "message": "提案已改写，等待重新审批",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 放入独立队列（Tier1 新增 — D7 独立队列）
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/queue
@router.post("/suggestions/{suggestion_id}/queue")
@require_admin
async def queue_suggestion(
    suggestion_id: str,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """将建议放入独立审批队列（Tier1 新增）。

    当会话关闭且提案仍处于 pending 时调用，将提案状态改为 queued。

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    logger.info(
        f"管理员 {current_user.name} 将建议放入独立队列: {suggestion_id}"
    )

    suggestion = await service.queue_suggestion(db, suggestion_id)

    if not suggestion:
        return {"code": 404, "message": "建议不存在或状态转换无效", "data": None}

    return {
        "code": 0,
        "message": "建议已放入独立审批队列",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 队列中审批通过（Tier1 新增 — D7 独立队列审批）
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/dequeue-approve
@router.post("/suggestions/{suggestion_id}/dequeue-approve")
@require_admin
async def dequeue_approve_suggestion(
    suggestion_id: str,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """从独立队列中审批通过建议（Tier1 新增）。

    流程与 approve 一致：状态流转 + KB 落库 + Neo4j 写图。

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    logger.info(
        f"管理员 {current_user.name} 从队列中审批通过建议: {suggestion_id}"
    )

    neo4j_client = await get_neo4j_client()

    suggestion = await service.dequeue_approve(
        db, suggestion_id, current_user.employee_id,
        neo4j_client=neo4j_client,
    )

    if not suggestion:
        return {"code": 404, "message": "建议不存在或状态转换无效", "data": None}

    return {
        "code": 0,
        "message": "队列审批通过，建议已应用到知识库并同步至知识图谱",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 获取统计
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/stats
@router.get("/stats")
@require_admin
async def get_stats(
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """获取知识库优化建议统计。

    返回各状态的建议数量统计（含 queued/graph_synced/expired）。

    **需要管理员权限。**
    """
    stats = await service.get_suggestion_stats(db)

    return {
        "code": 0,
        "message": "success",
        "data": KnowledgeSuggestionStatsResponse(**stats),
    }


# -----------------------------------------------------------------------------
# 知识图谱可视化（任务2：P2）
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/graph
@router.get("/graph")
@require_admin
async def get_knowledge_graph(
    limit: int = Query(default=100, ge=10, le=500, description="节点数量上限"),
    issue_name: Optional[str] = Query(default=None, description="指定Issue名称查询子图"),
    current_user: UserInfo = Depends(get_current_user),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """获取知识图谱数据（Neo4j 节点+关系 JSON 格式）。

    返回 ECharts 力导向图兼容的节点和关系数据。
    支持全图查询（默认）和指定 Issue 的子图查询。

    - **limit**: 节点数量上限（10-500）
    - **issue_name**: 指定 Issue 名称时查询子图（用于审批卡片预览）

    **需要管理员权限。**
    """
    neo4j_client = await get_neo4j_client()

    if not neo4j_client:
        return {
            "code": 0,
            "message": "Neo4j 不可用，图数据为空",
            "data": {"nodes": [], "links": []},
        }

    if issue_name:
        graph_data = await neo4j_client.query_issue_subgraph(
            issue_name=issue_name, depth=1
        )
    else:
        graph_data = await neo4j_client.query_full_graph(limit=limit)

    return {
        "code": 0,
        "message": "success",
        "data": graph_data,
    }


# -----------------------------------------------------------------------------
# 检查重复建议（任务3：P2 知识去重）
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/suggestions/{id}/duplicates
@router.get("/suggestions/{suggestion_id}/duplicates")
@require_admin
async def check_duplicates(
    suggestion_id: str,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """检查指定建议是否存在重复（利用 Neo4j 图结构 + SQL 文本相似）。

    在采纳建议前调用，检测是否有同名 Issue 或相似标题的已有条目。
    返回重复项列表供训练师参考。

    - **suggestion_id**: 建议ID

    **需要管理员权限。**
    """
    from sqlalchemy import select

    stmt = select(KnowledgeSuggestion).where(
        KnowledgeSuggestion.id == suggestion_id
    )
    result = await db.execute(stmt)
    suggestion = result.scalar_one_or_none()

    if not suggestion:
        return {"code": 404, "message": "建议不存在", "data": None}

    neo4j_client = await get_neo4j_client()

    duplicates = await service.find_duplicates(
        db=db,
        issue_name=suggestion.issue,
        title=suggestion.title,
        suggestion_id=suggestion_id,
        neo4j_client=neo4j_client,
    )

    return {
        "code": 0,
        "message": "success",
        "data": {
            "suggestion_id": suggestion_id,
            "has_duplicates": len(duplicates) > 0,
            "duplicates": duplicates,
        },
    }


# -----------------------------------------------------------------------------
# 合并重复建议（任务3：P2 知识去重）
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/merge
@router.post("/suggestions/{suggestion_id}/merge")
@require_admin
async def merge_suggestions(
    suggestion_id: str,
    body: KnowledgeSuggestionMerge,
    current_user: UserInfo = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """合并重复建议（去重操作）。

    将 duplicate_id 的建议合并到当前建议（primary），
    标签和元数据合并，重复建议标记为 rejected（合并归入）。

    - **suggestion_id**: 主建议ID（保留）
    - **duplicate_id**: 重复建议ID（将被合并）

    **需要管理员权限。**
    """
    logger.info(
        f"管理员 {current_user.name} 合并建议: "
        f"primary={suggestion_id}, duplicate={body.duplicate_id}"
    )

    merged = await service.merge_suggestions(
        db=db,
        primary_id=suggestion_id,
        duplicate_id=body.duplicate_id,
        reviewer_id=current_user.employee_id,
    )

    if not merged:
        return {"code": 404, "message": "主建议不存在", "data": None}

    return {
        "code": 0,
        "message": "建议合并完成，重复建议已标记为已驳回（合并归入）",
        "data": KnowledgeSuggestionResponse.model_validate(merged),
    }