from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from typing import List, Optional
import json

from database import get_db
from models.customer_relationship import CustomerRelationship
from models.user import User
from schemas.customer_relationship import CustomerRelationshipResponse, CustomerRelationshipCreate, CustomerRelationshipUpdate
from routers.auth import get_current_user, is_admin_user
from routers.operation_log import create_operation_log

router = APIRouter()

# 获取客户关系列表
@router.get("/", response_model=List[CustomerRelationshipResponse])
async def get_customer_relationships(
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    # admin用户和超级管理员可以查看所有客户关系
    if is_admin_user(current_user) or current_user.is_superadmin:
        customer_relationships = db.query(CustomerRelationship).all()
    else:
        # 普通用户只能查看自己公司的客户关系
        customer_relationships = db.query(CustomerRelationship).filter(
            CustomerRelationship.company_code == current_user.company_code
        ).all()
    
    # 转换social_media字段从JSON字符串到字典
    for cr in customer_relationships:
        if cr.social_media:
            try:
                cr.social_media = json.loads(cr.social_media)
            except:
                cr.social_media = {}
    
    return customer_relationships

# 通过ID获取客户关系详情
@router.get("/{customer_id}", response_model=CustomerRelationshipResponse)
async def get_customer_relationship(
    customer_id: int,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    customer_relationship = db.query(CustomerRelationship).filter(CustomerRelationship.id == customer_id).first()
    if customer_relationship is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Customer relationship with ID '{customer_id}' not found"
        )
    
    # 检查权限：admin用户和超级管理员可以查看所有客户关系，普通用户只能查看自己公司的
    if not is_admin_user(current_user) and not current_user.is_superadmin and customer_relationship.company_code != current_user.company_code:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="You don't have permission to access this customer relationship"
        )
    
    # 转换social_media字段从JSON字符串到字典
    if customer_relationship.social_media:
        try:
            customer_relationship.social_media = json.loads(customer_relationship.social_media)
        except:
            customer_relationship.social_media = {}
    
    return customer_relationship

# 创建客户关系
@router.post("/", response_model=CustomerRelationshipResponse)
async def create_customer_relationship(
    customer_relationship: CustomerRelationshipCreate,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    # 检查权限：admin用户和超级管理员可以为任何公司创建客户关系，普通用户只能为自己公司创建
    if not is_admin_user(current_user) and not current_user.is_superadmin and customer_relationship.company_code != current_user.company_code:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="You don't have permission to create customer relationships for other companies"
        )
    
    # 转换social_media字典为JSON字符串
    customer_data = customer_relationship.model_dump()
    if customer_data.get('social_media'):
        customer_data['social_media'] = json.dumps(customer_data['social_media'], ensure_ascii=False)
    
    db_customer = CustomerRelationship(**customer_data)
    db.add(db_customer)
    db.commit()
    db.refresh(db_customer)
    
    # 记录操作日志
    create_operation_log(
        db=db,
        user=current_user,
        module="customer_relationship",
        operation_type="add",
        operation_detail=f"新增客户关系：{db_customer.customer_name}（联系人：{db_customer.contact_person}）",
        company_code=current_user.company_code
    )
    
    # 转换social_media字段从JSON字符串到字典
    if db_customer.social_media:
        try:
            db_customer.social_media = json.loads(db_customer.social_media)
        except:
            db_customer.social_media = {}
    
    return db_customer

# 更新客户关系
@router.put("/{customer_id}", response_model=CustomerRelationshipResponse)
async def update_customer_relationship(
    customer_id: int,
    customer_update: CustomerRelationshipUpdate,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    customer_relationship = db.query(CustomerRelationship).filter(CustomerRelationship.id == customer_id).first()
    if customer_relationship is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Customer relationship with ID '{customer_id}' not found"
        )
    
    # 检查权限：admin用户和超级管理员可以更新所有客户关系，普通用户只能更新自己公司的
    if not is_admin_user(current_user) and not current_user.is_superadmin and customer_relationship.company_code != current_user.company_code:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="You don't have permission to update this customer relationship"
        )
    
    # 记录修改前的数据
    before_data_dict = {
        "customer_name": customer_relationship.customer_name,
        "contact_person": customer_relationship.contact_person,
        "phone": customer_relationship.phone,
        "email": customer_relationship.email,
        "social_media": customer_relationship.social_media,
        "address": customer_relationship.address,
        "notes": customer_relationship.notes
    }
    
    # 更新客户关系信息
    update_data = customer_update.model_dump(exclude_unset=True)
    if 'social_media' in update_data:
        update_data['social_media'] = json.dumps(update_data['social_media'], ensure_ascii=False)
    
    for field, value in update_data.items():
        setattr(customer_relationship, field, value)
    
    db.commit()
    db.refresh(customer_relationship)
    
    # 记录修改后的数据
    after_data_dict = {
        "customer_name": customer_relationship.customer_name,
        "contact_person": customer_relationship.contact_person,
        "phone": customer_relationship.phone,
        "email": customer_relationship.email,
        "social_media": customer_relationship.social_media,
        "address": customer_relationship.address,
        "notes": customer_relationship.notes
    }
    
    # 只记录有修改的字段，使用中文解析
    modified_fields = []
    field_names = {
        "customer_name": "客户名称",
        "contact_person": "联系人",
        "phone": "电话",
        "email": "邮箱",
        "social_media": "社交平台账号",
        "address": "地址",
        "notes": "备注"
    }
    
    for field, chinese_name in field_names.items():
        if before_data_dict[field] != after_data_dict[field]:
            modified_fields.append(f"{chinese_name}：{before_data_dict[field]} → {after_data_dict[field]}")
    
    # 生成中文描述的修改内容
    if modified_fields:
        modification_detail = "；".join(modified_fields)
    else:
        modification_detail = "无字段修改"
    
    # 记录操作日志
    create_operation_log(
        db=db,
        user=current_user,
        module="customer_relationship",
        operation_type="edit",
        operation_detail=f"编辑客户关系：{customer_relationship.customer_name}（联系人：{customer_relationship.contact_person}）",
        before_data=modification_detail,
        after_data=None,
        company_code=current_user.company_code
    )
    
    # 转换social_media字段从JSON字符串到字典
    if customer_relationship.social_media:
        try:
            customer_relationship.social_media = json.loads(customer_relationship.social_media)
        except:
            customer_relationship.social_media = {}
    
    return customer_relationship

# 删除客户关系
@router.delete("/{customer_id}")
async def delete_customer_relationship(
    customer_id: int,
    current_user: User = Depends(get_current_user),
    db: Session = Depends(get_db)
):
    customer_relationship = db.query(CustomerRelationship).filter(CustomerRelationship.id == customer_id).first()
    if customer_relationship is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Customer relationship with ID '{customer_id}' not found"
        )
    
    # 检查权限：admin用户和超级管理员可以删除所有客户关系，普通用户只能删除自己公司的
    if not is_admin_user(current_user) and not current_user.is_superadmin and customer_relationship.company_code != current_user.company_code:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="You don't have permission to delete this customer relationship"
        )
    
    # 记录客户关系名称和联系人，用于日志
    customer_name = customer_relationship.customer_name
    contact_person = customer_relationship.contact_person
    
    db.delete(customer_relationship)
    db.commit()
    
    # 记录操作日志
    create_operation_log(
        db=db,
        user=current_user,
        module="customer_relationship",
        operation_type="delete",
        operation_detail=f"删除客户关系：{customer_name}（联系人：{contact_person}）",
        company_code=current_user.company_code
    )
    
    return {"message": f"Customer relationship with ID '{customer_id}' deleted successfully"}