# =============================================================================
# 企微IT智能服务台 — 知识库自动迭代 API
# =============================================================================
# 说明：知识库自动迭代相关接口
#   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
#   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
#   5. POST /api/admin/knowledge-iteration/suggestions/{id}/reject - 审核拒绝
#   6. 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 require_admin
from app.models.user import User
from app.schemas.knowledge_suggestion import (
    KnowledgeSuggestionListResponse,
    KnowledgeSuggestionResponse,
    KnowledgeSuggestionStatsResponse,
    KnowledgeSuggestionApprove,
    KnowledgeSuggestionReject,
)
from app.services.knowledge_iteration_service import (
    KnowledgeIterationService,
    dep_knowledge_iteration_service,
)

logger = logging.getLogger(__name__)

router = APIRouter()


# -----------------------------------------------------------------------------
# 触发分析
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/analyze
@router.post("/analyze")
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: User = Depends(require_admin),
    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，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.username} 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
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/suggestions
@router.get("/suggestions")
async def list_suggestions(
    status: Optional[str] = Query(default=None, description="筛选状态"),
    suggestion_type: Optional[str] = Query(default=None, description="筛选类型"),
    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: User = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """获取知识库优化建议列表。

    - **status**: 筛选状态（pending/approved/rejected/applied）
    - **suggestion_type**: 筛选类型（new_faq/update/outdated）
    - **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)

    # 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
        )

    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}")
async def get_suggestion(
    suggestion_id: str,
    current_user: User = Depends(require_admin),
    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
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/approve
@router.post("/suggestions/{suggestion_id}/approve")
async def approve_suggestion(
    suggestion_id: str,
    body: KnowledgeSuggestionApprove,
    current_user: User = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
    service: KnowledgeIterationService = Depends(dep_knowledge_iteration_service),
):
    """审核通过知识库优化建议。

    审核通过后，如果是新FAQ或更新建议，将自动添加到知识库。

    - **suggestion_id**: 建议ID

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

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

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

    return {
        "code": 0,
        "message": "审核通过，建议已应用到知识库",
        "data": KnowledgeSuggestionResponse.model_validate(suggestion),
    }


# -----------------------------------------------------------------------------
# 审核拒绝
# -----------------------------------------------------------------------------
# POST /api/admin/knowledge-iteration/suggestions/{id}/reject
@router.post("/suggestions/{suggestion_id}/reject")
async def reject_suggestion(
    suggestion_id: str,
    body: KnowledgeSuggestionReject,
    current_user: User = Depends(require_admin),
    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.username} 拒绝建议: {suggestion_id}, "
        f"理由: {body.reject_reason}"
    )

    suggestion = await service.reject_suggestion(
        db, suggestion_id, current_user.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),
    }


# -----------------------------------------------------------------------------
# 获取统计
# -----------------------------------------------------------------------------
# GET /api/admin/knowledge-iteration/stats
@router.get("/stats")
async def get_stats(
    current_user: User = Depends(require_admin),
    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。

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

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