package message

import (
	"encoding/json"
	"fmt"
	"net/url"
	"regexp"
	"strconv"
	"strings"
)

type ImageMessage struct {
	Type string           `json:"type"`
	Data ImageMessageData `json:"data"`
}

type ImageMessageData struct {
	File       string `json:"file"`
	SubType    string `json:"sub_type"`
	FileID     string `json:"file_id"`
	URL        string `json:"url"`
	FileSize   int    `json:"file_size"`
	FileUnique string `json:"file_unique"`
}

func init() {
	RegisterMessageType(TypeImage, func() CQMessage {
		return &ImageMessage{Type: TypeImage}
	})
}

func (msg *ImageMessage) SetData(data json.RawMessage) error {
	return json.Unmarshal(data, &msg.Data)
}

func (msg *ImageMessage) ToCQString() string {
	if msg.Data.URL == "" && msg.Data.File == "" {
		return ""
	}
	// URL 转义
	escapedURL := url.QueryEscape(msg.Data.URL)

	// 构造 CQ:image 字符串
	cqString := fmt.Sprintf("[CQ:image,file=%s,sub_type=%s,file_id=%s,url=%s,file_size=%d,file_unique=%s]",
		msg.Data.File, msg.Data.SubType, msg.Data.FileID, escapedURL, msg.Data.FileSize, msg.Data.FileUnique)

	return cqString
}

func (msg *ImageMessage) ParseMessage(data string) error {
	// 使用正则表达式提取各个字段
	re := regexp.MustCompile(`\[CQ:image,file=(.*?),sub_type=(.*?),file_id=(.*?),url=(.*?),file_size=(\d+),file_unique=(.*?)\]`)
	matches := re.FindStringSubmatch(data)
	if len(matches) < 7 {
		return fmt.Errorf("数据格式不正确")
	}

	// 转换file_size为整数
	fileSize, err := strconv.Atoi(matches[5])
	if err != nil {
		return fmt.Errorf("解析 file_size 出错: %v", err)
	}

	// 处理URL转义
	decodedURL, err := url.QueryUnescape(matches[4])

	decodedURL = strings.ReplaceAll(decodedURL, "&#44;", ",")
	decodedURL = strings.ReplaceAll(decodedURL, "&#91;", "[")
	decodedURL = strings.ReplaceAll(decodedURL, "&#93;", "]")
	decodedURL = strings.ReplaceAll(decodedURL, "&amp;", "&")
	if err != nil {
		return fmt.Errorf("URL 转义失败: %v", err)
	}
	msg.Data = ImageMessageData{
		File:       matches[1],
		SubType:    matches[2],
		FileID:     matches[3],
		URL:        decodedURL,
		FileSize:   fileSize,
		FileUnique: matches[6],
	}
	return nil
}