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package com.github.yingzhuo.fastdfs.springboot.domain.fdfs;

import com.github.yingzhuo.fastdfs.springboot.domain.proto.OtherConstants;
import com.github.yingzhuo.fastdfs.springboot.domain.proto.mapper.Column;
import com.github.yingzhuo.fastdfs.springboot.domain.proto.mapper.DynamicFieldType;
import com.github.yingzhuo.fastdfs.springboot.exception.FastDFSUnsupportedStorePathException;
import lombok.*;

/**
 * 存储文件的路径信息
 *
 * @author tobato
 */
@Getter
@Setter
@ToString
@AllArgsConstructor
@NoArgsConstructor
public class StorePath {

    private static final String SPLIT_GROUP_NAME_AND_FILENAME_SEPARATOR = "/";

    private static final String SPLIT_GROUP_NAME = "group";

    @Column(index = 0, max = OtherConstants.FDFS_GROUP_NAME_MAX_LEN)
    private String group;

    @Column(index = 1, dynamicField = DynamicFieldType.ALL_REST_BYTE)
    private String path;

    public static StorePath parseFromUrl(String filePath) {
        String group = getGroupName(filePath);

        // 获取group起始位置
        int pathStartPos = filePath.indexOf(group) + group.length() + 1;
        String path = filePath.substring(pathStartPos);
        return new StorePath(group, path);
    }

    private static String getGroupName(String filePath) {
        //先分隔开路径
        String[] paths = filePath.split(SPLIT_GROUP_NAME_AND_FILENAME_SEPARATOR);

        if (paths.length == 1) {
            throw new FastDFSUnsupportedStorePathException("解析文件路径错误,有效的路径样式为(group/path) 而当前解析路径为".concat(filePath));
        }

        for (String item : paths) {
            if (item.contains(SPLIT_GROUP_NAME)) {
                return item;
            }
        }

        throw new FastDFSUnsupportedStorePathException("解析文件路径错误,被解析路径url没有group,当前解析路径为".concat(filePath));
    }

    public String getFullPath() {
        return this.group.concat(SPLIT_GROUP_NAME_AND_FILENAME_SEPARATOR).concat(this.path);
    }

}