"""
用户反馈API端点
"""

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel, Field, field_validator
from typing import List, Optional
from datetime import datetime
from pathlib import Path
import json
import logging

from app.config.settings import settings
from app.config.constants import FEEDBACKS_FILE

router = APIRouter()
logger = logging.getLogger(__name__)


class FeedbackCreate(BaseModel):
    """反馈创建模型"""

    username: str = Field(..., min_length=1, max_length=50, description="用户名")
    content: str = Field(..., min_length=1, max_length=1000, description="反馈内容")

    @field_validator("username")
    @classmethod
    def validate_username(cls, v):
        v = v.strip()
        if not v:
            raise ValueError("用户名不能为空")
        return v

    @field_validator("content")
    @classmethod
    def validate_content(cls, v):
        v = v.strip()
        if not v:
            raise ValueError("反馈内容不能为空")
        return v


class FeedbackResponse(BaseModel):
    """反馈响应模型"""

    id: str
    username: str
    content: str
    timestamp: str


def _get_feedbacks_file_path() -> Path:
    """获取反馈文件路径"""
    data_dir = settings.DATA_DIR
    data_dir.mkdir(parents=True, exist_ok=True)
    return data_dir / FEEDBACKS_FILE


# 确保反馈文件存在且格式正确
def _initialize_feedback_file():
    """初始化反馈文件"""
    feedbacks_file = _get_feedbacks_file_path()
    if not feedbacks_file.exists() or feedbacks_file.stat().st_size == 0:
        try:
            with open(feedbacks_file, "w", encoding="utf-8") as f:
                json.dump([], f, ensure_ascii=False)
            logger.info("反馈文件初始化完成")
        except Exception as e:
            logger.error(f"初始化反馈文件失败: {e}")


# 应用启动时初始化
_initialize_feedback_file()


def _load_feedbacks() -> List[FeedbackResponse]:
    """加载反馈记录"""
    feedbacks_file = _get_feedbacks_file_path()
    if not feedbacks_file.exists():
        return []

    # 检查文件大小，避免空文件解析错误
    if feedbacks_file.stat().st_size == 0:
        return []

    try:
        with open(feedbacks_file, "r", encoding="utf-8") as f:
            content = f.read().strip()
            if not content:
                return []
            data = json.loads(content)
            return [FeedbackResponse(**item) for item in data]
    except json.JSONDecodeError as e:
        logger.error(f"JSON解析失败: {e}")
        return []
    except Exception as e:
        logger.error(f"加载反馈记录失败: {e}")
        return []


def _save_feedbacks(feedbacks: List[FeedbackResponse]) -> bool:
    """保存反馈记录"""
    feedbacks_file = _get_feedbacks_file_path()
    try:
        with open(feedbacks_file, "w", encoding="utf-8") as f:
            json.dump([fb.dict() for fb in feedbacks], f, ensure_ascii=False, indent=2)
            f.flush()
        return True
    except Exception as e:
        logger.error(f"保存反馈记录失败: {e}")
        return False


@router.get("/", response_model=List[FeedbackResponse])
async def get_feedbacks():
    """获取所有反馈记录"""
    feedbacks = _load_feedbacks()
    return sorted(feedbacks, key=lambda x: x.timestamp, reverse=True)


@router.post("/", response_model=FeedbackResponse)
async def create_feedback(feedback: FeedbackCreate):
    """创建新反馈"""
    try:
        feedbacks = _load_feedbacks()

        new_feedback = FeedbackResponse(
            id=datetime.now().strftime("%Y%m%d%H%M%S"),
            username=feedback.username,
            content=feedback.content,
            timestamp=datetime.now().strftime("%Y-%m-%d %H:%M"),
        )

        feedbacks.append(new_feedback)

        if _save_feedbacks(feedbacks):
            logger.info(f"新反馈已提交: {feedback.username}")
            return new_feedback
        else:
            raise HTTPException(status_code=500, detail="保存反馈失败")

    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"创建反馈失败: {e}")
        raise HTTPException(status_code=500, detail=f"创建反馈失败: {str(e)}")


@router.delete("/{feedback_id}")
async def delete_feedback(feedback_id: str):
    """删除反馈记录"""
    try:
        feedbacks = _load_feedbacks()
        original_count = len(feedbacks)

        feedbacks = [fb for fb in feedbacks if fb.id != feedback_id]

        if len(feedbacks) == original_count:
            raise HTTPException(
                status_code=404, detail=f"反馈记录 {feedback_id} 不存在"
            )

        if _save_feedbacks(feedbacks):
            return {"success": True, "message": "反馈记录已删除"}
        else:
            raise HTTPException(status_code=500, detail="保存失败")

    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"删除反馈失败: {e}")
        raise HTTPException(status_code=500, detail=f"删除反馈失败: {str(e)}")