package com.vibevault.exception;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.server.ResponseStatusException;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * 全局异常处理器
 * 
 * 需要实现：
 * - 捕获 ResourceNotFoundException 并返回 404 状态码
 * - 捕获 UnauthorizedException 并返回 403 状态码
 * - 捕获 ResponseStatusException 并返回对应状态码
 * - [Advanced] 统一处理其他异常，返回合适的错误响应格式
 */
@RestControllerAdvice
public class GlobalExceptionHandler {

    /**
     * 处理 ResourceNotFoundException 异常
     * @param ex 异常对象
     * @return 包含错误信息的 ResponseEntity
     */
    @ExceptionHandler(ResourceNotFoundException.class)
    public ResponseEntity<Map<String, Object>> handleResourceNotFoundException(ResourceNotFoundException ex) {
        Map<String, Object> body = new HashMap<>();
        body.put("timestamp", LocalDateTime.now());
        body.put("status", HttpStatus.NOT_FOUND.value());
        body.put("error", "Not Found");
        body.put("message", ex.getMessage());
        
        return new ResponseEntity<>(body, HttpStatus.NOT_FOUND);
    }

    /**
     * 处理 UnauthorizedAccessException 异常
     * @param ex 异常对象
     * @return 包含错误信息的 ResponseEntity
     */
    @ExceptionHandler(UnauthorizedAccessException.class)
    public ResponseEntity<Map<String, Object>> handleUnauthorizedAccessException(UnauthorizedAccessException ex) {
        Map<String, Object> body = new HashMap<>();
        body.put("timestamp", LocalDateTime.now());
        body.put("status", HttpStatus.FORBIDDEN.value());
        body.put("error", "Forbidden");
        body.put("message", ex.getMessage());
        
        return new ResponseEntity<>(body, HttpStatus.FORBIDDEN);
    }

    /**
     * 处理 ResponseStatusException 异常
     * @param ex 异常对象
     * @return 包含错误信息的 ResponseEntity
     */
    @ExceptionHandler(ResponseStatusException.class)
    public ResponseEntity<Map<String, Object>> handleResponseStatusException(ResponseStatusException ex) {
        Map<String, Object> body = new HashMap<>();
        body.put("timestamp", LocalDateTime.now());
        body.put("status", ex.getStatusCode().value());
        body.put("error", ex.getStatusCode().toString());
        body.put("message", ex.getMessage());
        
        return new ResponseEntity<>(body, ex.getStatusCode());
    }

    /**
     * 处理所有其他未捕获的异常
     * @param ex 异常对象
     * @return 包含错误信息的 ResponseEntity
     */
    @ExceptionHandler(Exception.class)
    public ResponseEntity<Map<String, Object>> handleGeneralException(Exception ex) {
        Map<String, Object> body = new HashMap<>();
        body.put("timestamp", LocalDateTime.now());
        body.put("status", HttpStatus.INTERNAL_SERVER_ERROR.value());
        body.put("error", "Internal Server Error");
        body.put("message", "An unexpected error occurred");
        
        // 在开发环境中可以添加异常堆栈信息
        // body.put("stackTrace", Arrays.toString(ex.getStackTrace()));
        
        return new ResponseEntity<>(body, HttpStatus.INTERNAL_SERVER_ERROR);
    }
}