"""
功能开关管理 API
"""

import os
import json
from typing import Optional, List, Dict

import pymysql
from fastapi import APIRouter, Depends, HTTPException, status, Query

from .auth import get_current_admin, get_db_connection, AdminUserInfo
from .schemas import (
    FeatureSwitchCreate,
    FeatureSwitchUpdate,
    FeatureSwitchResponse,
    FeatureSwitchGroupResponse,
    ResponseModel,
)

router = APIRouter(prefix="/features", tags=["功能开关"])

# 功能分组显示名称
FEATURE_GROUP_NAMES = {
    "exam": "考试模块",
    "practice": "陪练模块",
    "broadcast": "播课模块",
    "course": "课程模块",
    "yanji": "智能工牌模块",
    "auth": "认证模块",
}


def log_operation(cursor, admin: AdminUserInfo, tenant_id: int, tenant_code: str,
                  operation_type: str, resource_type: str, resource_id: int,
                  resource_name: str, old_value: dict = None, new_value: dict = None):
    """记录操作日志"""
    cursor.execute(
        """
        INSERT INTO operation_logs 
        (admin_user_id, admin_username, tenant_id, tenant_code, operation_type, 
         resource_type, resource_id, resource_name, old_value, new_value)
        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
        """,
        (admin.id, admin.username, tenant_id, tenant_code, operation_type,
         resource_type, resource_id, resource_name,
         json.dumps(old_value, ensure_ascii=False) if old_value else None,
         json.dumps(new_value, ensure_ascii=False) if new_value else None)
    )


@router.get("/defaults", response_model=List[FeatureSwitchGroupResponse], summary="获取默认功能开关")
async def get_default_features(
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """获取全局默认的功能开关配置"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            cursor.execute(
                """
                SELECT * FROM feature_switches 
                WHERE tenant_id IS NULL 
                ORDER BY feature_group, id
                """
            )
            rows = cursor.fetchall()
            
            # 按分组整理
            groups: Dict[str, List] = {}
            for row in rows:
                group = row["feature_group"] or "other"
                if group not in groups:
                    groups[group] = []
                
                config = None
                if row.get("config"):
                    try:
                        config = json.loads(row["config"])
                    except:
                        pass
                
                groups[group].append(FeatureSwitchResponse(
                    id=row["id"],
                    tenant_id=row["tenant_id"],
                    feature_code=row["feature_code"],
                    feature_name=row["feature_name"],
                    feature_group=row["feature_group"],
                    is_enabled=row["is_enabled"],
                    config=config,
                    description=row["description"],
                    created_at=row["created_at"],
                    updated_at=row["updated_at"],
                ))
            
            return [
                FeatureSwitchGroupResponse(
                    group_name=group,
                    group_display_name=FEATURE_GROUP_NAMES.get(group, group),
                    features=features,
                )
                for group, features in groups.items()
            ]
    finally:
        conn.close()


@router.get("/tenants/{tenant_id}", response_model=List[FeatureSwitchGroupResponse], summary="获取租户功能开关")
async def get_tenant_features(
    tenant_id: int,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """
    获取租户的功能开关配置
    
    返回租户自定义配置和默认配置的合并结果
    """
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 验证租户存在
            cursor.execute("SELECT code FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            if not tenant:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 获取默认配置
            cursor.execute(
                """
                SELECT * FROM feature_switches 
                WHERE tenant_id IS NULL 
                ORDER BY feature_group, id
                """
            )
            default_rows = cursor.fetchall()
            
            # 获取租户配置
            cursor.execute(
                """
                SELECT * FROM feature_switches 
                WHERE tenant_id = %s
                """,
                (tenant_id,)
            )
            tenant_rows = cursor.fetchall()
            
            # 合并配置
            tenant_features = {row["feature_code"]: row for row in tenant_rows}
            
            groups: Dict[str, List] = {}
            for row in default_rows:
                group = row["feature_group"] or "other"
                if group not in groups:
                    groups[group] = []
                
                # 使用租户配置覆盖默认配置
                effective_row = tenant_features.get(row["feature_code"], row)
                
                config = None
                if effective_row.get("config"):
                    try:
                        config = json.loads(effective_row["config"])
                    except:
                        pass
                
                groups[group].append(FeatureSwitchResponse(
                    id=effective_row["id"],
                    tenant_id=effective_row["tenant_id"],
                    feature_code=effective_row["feature_code"],
                    feature_name=effective_row["feature_name"],
                    feature_group=effective_row["feature_group"],
                    is_enabled=effective_row["is_enabled"],
                    config=config,
                    description=effective_row["description"],
                    created_at=effective_row["created_at"],
                    updated_at=effective_row["updated_at"],
                ))
            
            return [
                FeatureSwitchGroupResponse(
                    group_name=group,
                    group_display_name=FEATURE_GROUP_NAMES.get(group, group),
                    features=features,
                )
                for group, features in groups.items()
            ]
    finally:
        conn.close()


@router.put("/tenants/{tenant_id}/{feature_code}", response_model=ResponseModel, summary="更新租户功能开关")
async def update_tenant_feature(
    tenant_id: int,
    feature_code: str,
    data: FeatureSwitchUpdate,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """更新租户的功能开关"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 验证租户存在
            cursor.execute("SELECT code FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            if not tenant:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 获取默认配置
            cursor.execute(
                """
                SELECT * FROM feature_switches 
                WHERE tenant_id IS NULL AND feature_code = %s
                """,
                (feature_code,)
            )
            default_feature = cursor.fetchone()
            
            if not default_feature:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="无效的功能编码",
                )
            
            # 检查租户是否已有配置
            cursor.execute(
                """
                SELECT id, is_enabled FROM feature_switches 
                WHERE tenant_id = %s AND feature_code = %s
                """,
                (tenant_id, feature_code)
            )
            existing = cursor.fetchone()
            
            if existing:
                # 更新
                old_enabled = existing["is_enabled"]
                
                update_fields = []
                update_values = []
                
                if data.is_enabled is not None:
                    update_fields.append("is_enabled = %s")
                    update_values.append(data.is_enabled)
                
                if data.config is not None:
                    update_fields.append("config = %s")
                    update_values.append(json.dumps(data.config))
                
                if update_fields:
                    update_values.append(existing["id"])
                    cursor.execute(
                        f"UPDATE feature_switches SET {', '.join(update_fields)} WHERE id = %s",
                        update_values
                    )
            else:
                # 创建租户配置
                old_enabled = default_feature["is_enabled"]
                
                cursor.execute(
                    """
                    INSERT INTO feature_switches 
                    (tenant_id, feature_code, feature_name, feature_group, is_enabled, config, description)
                    VALUES (%s, %s, %s, %s, %s, %s, %s)
                    """,
                    (tenant_id, feature_code, default_feature["feature_name"],
                     default_feature["feature_group"],
                     data.is_enabled if data.is_enabled is not None else default_feature["is_enabled"],
                     json.dumps(data.config) if data.config else default_feature["config"],
                     default_feature["description"])
                )
            
            # 记录操作日志
            log_operation(
                cursor, admin, tenant_id, tenant["code"],
                "update", "feature", tenant_id, feature_code,
                old_value={"is_enabled": old_enabled},
                new_value={"is_enabled": data.is_enabled, "config": data.config}
            )
            
            conn.commit()
            
            status_text = "启用" if data.is_enabled else "禁用"
            return ResponseModel(message=f"功能 {default_feature['feature_name']} 已{status_text}")
    finally:
        conn.close()


@router.delete("/tenants/{tenant_id}/{feature_code}", response_model=ResponseModel, summary="重置租户功能开关")
async def reset_tenant_feature(
    tenant_id: int,
    feature_code: str,
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """重置租户的功能开关为默认值"""
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 验证租户存在
            cursor.execute("SELECT code FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            if not tenant:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            # 删除租户配置
            cursor.execute(
                """
                DELETE FROM feature_switches 
                WHERE tenant_id = %s AND feature_code = %s
                """,
                (tenant_id, feature_code)
            )
            
            if cursor.rowcount == 0:
                return ResponseModel(message="功能配置已是默认值")
            
            # 记录操作日志
            log_operation(
                cursor, admin, tenant_id, tenant["code"],
                "reset", "feature", tenant_id, feature_code
            )
            
            conn.commit()
            
            return ResponseModel(message="功能配置已重置为默认值")
    finally:
        conn.close()


@router.post("/tenants/{tenant_id}/batch", response_model=ResponseModel, summary="批量更新功能开关")
async def batch_update_tenant_features(
    tenant_id: int,
    features: List[Dict],
    admin: AdminUserInfo = Depends(get_current_admin),
):
    """
    批量更新租户的功能开关
    
    请求体格式：
    [
        {"feature_code": "exam_module", "is_enabled": true},
        {"feature_code": "practice_voice", "is_enabled": false}
    ]
    """
    conn = get_db_connection()
    try:
        with conn.cursor() as cursor:
            # 验证租户存在
            cursor.execute("SELECT code FROM tenants WHERE id = %s", (tenant_id,))
            tenant = cursor.fetchone()
            if not tenant:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="租户不存在",
                )
            
            updated_count = 0
            for feature in features:
                feature_code = feature.get("feature_code")
                is_enabled = feature.get("is_enabled")
                
                if not feature_code or is_enabled is None:
                    continue
                
                # 获取默认配置
                cursor.execute(
                    """
                    SELECT * FROM feature_switches 
                    WHERE tenant_id IS NULL AND feature_code = %s
                    """,
                    (feature_code,)
                )
                default_feature = cursor.fetchone()
                
                if not default_feature:
                    continue
                
                # 检查租户是否已有配置
                cursor.execute(
                    """
                    SELECT id FROM feature_switches 
                    WHERE tenant_id = %s AND feature_code = %s
                    """,
                    (tenant_id, feature_code)
                )
                existing = cursor.fetchone()
                
                if existing:
                    cursor.execute(
                        "UPDATE feature_switches SET is_enabled = %s WHERE id = %s",
                        (is_enabled, existing["id"])
                    )
                else:
                    cursor.execute(
                        """
                        INSERT INTO feature_switches 
                        (tenant_id, feature_code, feature_name, feature_group, is_enabled, description)
                        VALUES (%s, %s, %s, %s, %s, %s)
                        """,
                        (tenant_id, feature_code, default_feature["feature_name"],
                         default_feature["feature_group"], is_enabled, default_feature["description"])
                    )
                
                updated_count += 1
            
            # 记录操作日志
            log_operation(
                cursor, admin, tenant_id, tenant["code"],
                "batch_update", "feature", tenant_id, f"批量更新 {updated_count} 项功能开关"
            )
            
            conn.commit()
            
            return ResponseModel(message=f"已更新 {updated_count} 项功能开关")
    finally:
        conn.close()