# 备份与操作日志管理

import os
import json
import shutil
from datetime import datetime
from flask import request, jsonify, current_app, session
from app.routes import main_bp
from app.models import db, Student, Class, User, PROBLEM_LIST
from app.routes.auth import login_required_json, admin_required
import logging

logger = logging.getLogger(__name__)

# 备份目录
BACKUP_DIR = os.path.join(
    os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "bk"
)
LOGS_DIR = os.path.join(BACKUP_DIR, "logs")
PROBLEMS_DIR = os.path.join(BACKUP_DIR, "problems")


def ensure_dirs():
    """确保备份目录存在"""
    os.makedirs(LOGS_DIR, exist_ok=True)
    os.makedirs(PROBLEMS_DIR, exist_ok=True)


def log_operation(action, operator, target_type, target_id, detail=""):
    """记录操作日志"""
    ensure_dirs()
    log_entry = {
        "timestamp": datetime.now().isoformat(),
        "action": action,
        "operator": operator,
        "target_type": target_type,
        "target_id": target_id,
        "detail": detail,
        "ip": request.remote_addr if request else None,
    }
    log_file = os.path.join(LOGS_DIR, f"{datetime.now().strftime('%Y-%m-%d')}.jsonl")
    with open(log_file, "a", encoding="utf-8") as f:
        f.write(json.dumps(log_entry, ensure_ascii=False) + "\n")
    return log_entry


def get_backup_list():
    """获取备份列表"""
    ensure_dirs()
    backups = []
    if os.path.exists(BACKUP_DIR):
        for name in os.listdir(BACKUP_DIR):
            path = os.path.join(BACKUP_DIR, name)
            if os.path.isdir(path) and name.startswith("backup_"):
                meta_file = os.path.join(path, "meta.json")
                meta = {}
                if os.path.exists(meta_file):
                    with open(meta_file, encoding="utf-8") as f:
                        meta = json.load(f)
                backups.append(
                    {
                        "id": name,
                        "created_at": meta.get("created_at", ""),
                        "operator": meta.get("operator", ""),
                        "description": meta.get("description", ""),
                        "includes": meta.get("includes", []),
                    }
                )
    return sorted(backups, key=lambda x: x["created_at"], reverse=True)


@main_bp.route("/api/backup", methods=["POST"])
@login_required_json
@admin_required
def create_backup():
    """创建数据备份"""
    ensure_dirs()
    data = request.get_json() or {}
    description = data.get("description", "")

    # 创建备份目录
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    backup_id = f"backup_{timestamp}"
    backup_path = os.path.join(BACKUP_DIR, backup_id)
    os.makedirs(backup_path, exist_ok=True)

    operator = session.get("username", "unknown")

    # 备份各类数据
    includes = []

    # 1. 备份班级
    classes = Class.query.all()
    classes_data = [c.to_dict() for c in classes]
    with open(os.path.join(backup_path, "classes.json"), "w", encoding="utf-8") as f:
        json.dump(classes_data, f, ensure_ascii=False, indent=2)
    includes.append("classes")

    # 2. 备份学员
    students = Student.query.all()
    students_data = []
    for s in students:
        students_data.append(
            {
                "id": s.id,
                "name": s.name,
                "phone": s.phone,
                "wechat_nickname": s.wechat_nickname,
                "practice_time": s.practice_time,
                "class_id": s.class_id,
                "notes": s.notes,
                "created_at": s.created_at.isoformat() if s.created_at else None,
            }
        )
    with open(os.path.join(backup_path, "students.json"), "w", encoding="utf-8") as f:
        json.dump(students_data, f, ensure_ascii=False, indent=2)
    includes.append("students")

    # 3. 备份问题配置
    problems_backup_dir = os.path.join(backup_path, "problems")
    os.makedirs(problems_backup_dir, exist_ok=True)

    # 读取问题文件
    problems_dir = current_app.config.get("PROBLEMS_DIR")
    if problems_dir and os.path.exists(problems_dir):
        for filename in os.listdir(problems_dir):
            if filename.endswith(".md"):
                src = os.path.join(problems_dir, filename)
                dest = os.path.join(problems_backup_dir, filename)
                shutil.copy2(src, dest)
    includes.append("problems")

    # 4. 备份配置文件
    config_path = os.path.join(
        os.path.dirname(os.path.dirname(__file__)), "config", "api_config.json"
    )
    if os.path.exists(config_path):
        shutil.copy2(config_path, os.path.join(backup_path, "api_config.json"))
        includes.append("config")

    # 写入元数据
    meta = {
        "backup_id": backup_id,
        "created_at": datetime.now().isoformat(),
        "operator": operator,
        "description": description,
        "includes": includes,
    }
    with open(os.path.join(backup_path, "meta.json"), "w", encoding="utf-8") as f:
        json.dump(meta, f, ensure_ascii=False, indent=2)

    # 记录操作日志
    log_operation(
        "backup_create", operator, "system", backup_id, f"创建备份: {description}"
    )

    return jsonify(
        {"message": "备份成功", "backup_id": backup_id, "includes": includes}
    )


@main_bp.route("/api/backup", methods=["GET"])
@login_required_json
def list_backups():
    """获取备份列表"""
    backups = get_backup_list()
    return jsonify(backups)


@main_bp.route("/api/backup/<backup_id>", methods=["GET"])
@login_required_json
def get_backup(backup_id):
    """查看备份内容"""
    backup_path = os.path.join(BACKUP_DIR, backup_id)
    if not os.path.exists(backup_path):
        return jsonify({"error": "备份不存在"}), 404

    # 读取元数据
    meta_file = os.path.join(backup_path, "meta.json")
    meta = {}
    if os.path.exists(meta_file):
        with open(meta_file, encoding="utf-8") as f:
            meta = json.load(f)

    # 读取各类数据
    data = {"meta": meta}

    for fname in ["classes.json", "students.json", "api_config.json"]:
        fpath = os.path.join(backup_path, fname)
        if os.path.exists(fpath):
            with open(fpath, encoding="utf-8") as f:
                data[fname.replace(".json", "")] = json.load(f)

    # 问题文件列表
    problems_dir = os.path.join(backup_path, "problems")
    if os.path.exists(problems_dir):
        data["problems"] = os.listdir(problems_dir)

    return jsonify(data)


@main_bp.route("/api/backup/<backup_id>/restore", methods=["POST"])
@login_required_json
@admin_required
def restore_backup(backup_id):
    """恢复备份（危险操作）"""
    data = request.get_json() or {}
    confirm_text = data.get("confirm", "")

    # 安全确认
    if confirm_text != "确认恢复":
        return jsonify({"error": "请输入 '确认恢复' 以确认此操作"}), 400

    backup_path = os.path.join(BACKUP_DIR, backup_id)
    if not os.path.exists(backup_path):
        return jsonify({"error": "备份不存在"}), 404

    operator = session.get("username", "unknown")

    # 先创建当前数据的自动备份
    auto_backup_id = f"auto_before_restore_{datetime.now().strftime('%Y%m%d_%H%M%S')}"
    auto_backup_path = os.path.join(BACKUP_DIR, auto_backup_id)
    shutil.copytree(backup_path, auto_backup_path)

    # 恢复各类数据
    restored = []

    # 1. 恢复班级
    classes_file = os.path.join(backup_path, "classes.json")
    if os.path.exists(classes_file):
        with open(classes_file, encoding="utf-8") as f:
            classes_data = json.load(f)
        # 清空并重建班级
        Class.query.delete()
        for c in classes_data:
            cls = Class(
                id=c.get("id"),
                name=c.get("name"),
                description=c.get("description"),
                active=c.get("active", True),
            )
            db.session.add(cls)
        db.session.commit()
        restored.append("classes")

    # 2. 恢复学员
    students_file = os.path.join(backup_path, "students.json")
    if os.path.exists(students_file):
        with open(students_file, encoding="utf-8") as f:
            students_data = json.load(f)
        # 清空并重建学员
        Student.query.delete()
        for s in students_data:
            student = Student(
                id=s.get("id"),
                name=s.get("name"),
                phone=s.get("phone"),
                wechat_nickname=s.get("wechat_nickname"),
                practice_time=s.get("practice_time", "30分钟"),
                class_id=s.get("class_id"),
                notes=s.get("notes"),
            )
            db.session.add(student)
        db.session.commit()
        restored.append("students")

    # 3. 恢复问题配置
    problems_src = os.path.join(backup_path, "problems")
    if os.path.exists(problems_src):
        # 获取目标问题目录
        problem_dir = current_app.config.get("PROBLEMS_DIR")
        if problem_dir and os.path.exists(problem_dir):
            # 清空目标目录
            for f in os.listdir(problem_dir):
                if f.endswith(".md"):
                    os.remove(os.path.join(problem_dir, f))
            # 复制备份的问题文件
            for f in os.listdir(problems_src):
                if f.endswith(".md"):
                    shutil.copy2(os.path.join(problems_src, f), problem_dir)
            restored.append("problems")

    # 记录操作日志
    log_operation(
        "backup_restore",
        operator,
        "system",
        backup_id,
        f"恢复备份: {backup_id}, 已自动备份当前数据到: {auto_backup_id}",
    )

    return jsonify(
        {"message": "恢复成功", "restored": restored, "auto_backup": auto_backup_id}
    )


@main_bp.route("/api/logs", methods=["GET"])
@login_required_json
@admin_required
def get_logs():
    """获取操作日志"""
    date = request.args.get("date", datetime.now().strftime("%Y-%m-%d"))
    log_file = os.path.join(LOGS_DIR, f"{date}.jsonl")

    if not os.path.exists(log_file):
        return jsonify([])

    logs = []
    with open(log_file, encoding="utf-8") as f:
        for line in f:
            if line.strip():
                logs.append(json.loads(line))
    return jsonify(logs)