package com.fujica.parkingtool.oss;

import java.util.Objects;
import java.util.prefs.Preferences;

/**
 * 阿里云 OSS 配置。
 *
 * <p>4 项核心字段：address / accessKey / secretKey / bucket。
 * 全部不为空且 address 是合法主机时被视作"有效配置"，否则 {@link #isUsable()} 返回 false，
 * 用于让上层选择"不传图片"。</p>
 *
 * <p>address 不需要带协议前缀；不含 bucket 子域名（即只是 OSS endpoint，
 * 例如 <code>oss-cn-hangzhou.aliyuncs.com</code>）。
 * 上传时会自动拼成 <code>https://{bucket}.{address}/{key}</code>。</p>
 *
 * <p>配置持久化在用户 Preferences 节点 <code>/com/fujica/parkingtool/oss</code> 下。</p>
 */
public final class OssSettings {

    private static final String PREF_ROOT = "/com/fujica/parkingtool/oss";

    private static final String KEY_ADDRESS    = "address";
    private static final String KEY_ACCESS_KEY = "accessKey";
    private static final String KEY_SECRET_KEY = "secretKey";
    private static final String KEY_BUCKET     = "bucket";
    private static final String KEY_PATH_PREFIX= "pathPrefix";

    /** OSS endpoint，不带 https://，不带 bucket 子域名 */
    private String address = "";
    private String accessKey = "";
    private String secretKey = "";
    private String bucket = "";
    /** 上传路径前缀，默认 parking-simulator */
    private String pathPrefix = "parking-simulator";

    public OssSettings() { }

    public String getAddress() { return address; }
    public void setAddress(String address) { this.address = address == null ? "" : address.trim(); }

    public String getAccessKey() { return accessKey; }
    public void setAccessKey(String accessKey) { this.accessKey = accessKey == null ? "" : accessKey.trim(); }

    public String getSecretKey() { return secretKey; }
    public void setSecretKey(String secretKey) { this.secretKey = secretKey == null ? "" : secretKey; }

    public String getBucket() { return bucket; }
    public void setBucket(String bucket) { this.bucket = bucket == null ? "" : bucket.trim(); }

    public String getPathPrefix() { return pathPrefix; }
    public void setPathPrefix(String pathPrefix) {
        if (pathPrefix == null) { this.pathPrefix = ""; return; }
        String p = pathPrefix.trim();
        // 去除首尾的多余斜杠
        while (p.startsWith("/")) p = p.substring(1);
        while (p.endsWith("/"))   p = p.substring(0, p.length() - 1);
        this.pathPrefix = p;
    }

    /** 4 项核心字段全部非空，且 address 形如 host[:port] 才算有效。 */
    public boolean isUsable() {
        if (isBlank(address) || isBlank(accessKey) || isBlank(secretKey) || isBlank(bucket)) {
            return false;
        }
        String cleaned = cleanAddress(address);
        // 简单校验：不能是带协议的 URL；必须包含一个点
        return !cleaned.contains("://") && cleaned.contains(".");
    }

    /** 去除可能错误粘进来的协议前缀和尾部斜杠，返回纯 host[:port] */
    public static String cleanAddress(String raw) {
        if (raw == null) return "";
        String s = raw.trim();
        if (s.startsWith("https://")) s = s.substring(8);
        if (s.startsWith("http://"))  s = s.substring(7);
        while (s.endsWith("/")) s = s.substring(0, s.length() - 1);
        return s;
    }

    /** 拼装最终公网 URL（https）：{bucket}.{address}/{key} */
    public String publicUrl(String key) {
        String addr = cleanAddress(address);
        String k = key == null ? "" : (key.startsWith("/") ? key.substring(1) : key);
        return "https://" + bucket + "." + addr + "/" + k;
    }

    private static boolean isBlank(String s) {
        return s == null || s.trim().isEmpty();
    }

    public static OssSettings load() {
        OssSettings s = new OssSettings();
        Preferences p = node();
        s.address    = p.get(KEY_ADDRESS,    s.address);
        s.accessKey  = p.get(KEY_ACCESS_KEY, s.accessKey);
        s.secretKey  = p.get(KEY_SECRET_KEY, s.secretKey);
        s.bucket     = p.get(KEY_BUCKET,     s.bucket);
        s.pathPrefix = p.get(KEY_PATH_PREFIX,s.pathPrefix);
        return s;
    }

    public void save() {
        Preferences p = node();
        p.put(KEY_ADDRESS,    address);
        p.put(KEY_ACCESS_KEY, accessKey);
        p.put(KEY_SECRET_KEY, secretKey);
        p.put(KEY_BUCKET,     bucket);
        p.put(KEY_PATH_PREFIX,pathPrefix);
    }

    public OssSettings copy() {
        OssSettings s = new OssSettings();
        s.address    = address;
        s.accessKey  = accessKey;
        s.secretKey  = secretKey;
        s.bucket     = bucket;
        s.pathPrefix = pathPrefix;
        return s;
    }

    private static Preferences node() {
        return Preferences.userRoot().node(PREF_ROOT);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof OssSettings that)) return false;
        return Objects.equals(address, that.address)
                && Objects.equals(accessKey, that.accessKey)
                && Objects.equals(secretKey, that.secretKey)
                && Objects.equals(bucket, that.bucket)
                && Objects.equals(pathPrefix, that.pathPrefix);
    }

    @Override
    public int hashCode() {
        return Objects.hash(address, accessKey, secretKey, bucket, pathPrefix);
    }
}