package com.yunhai.svchall.utils;

import org.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;

/**
 * 文件 URL 拼接契约单测（2026-09-20 封面裂图修复）：
 * 生产 public-base-url 以 /upload/ 结尾（https://base.yunhaixingtong.com/svc-hall/upload/），
 * 而库内相对值以 /upload/ 开头——拼接必须不产生 /upload/upload/ 叠加，
 * 且对历史已叠加损伤值（/upload/upload/…，实测库里叠了三层导致门户裂图）具备折叠自愈能力。
 * 不变式：存储布局 /upload/{image|file}/uuid.ext，upload 不是合法类型名，/upload/upload/ 永远非法。
 */
@DisplayName("FileUtil - 文件 URL 拼接与 /upload/ 段折叠")
class FileUtilTest {

    /** 生产形态：带 ctx 且以 /upload/ 结尾 */
    private static final String PROD_BASE = "http://base.yunhaixingtong.com/svc-hall/upload/";
    /** 本地形态：裸 host 以 /upload/ 结尾 */
    private static final String LOCAL_BASE = "http://localhost:8086/upload/";

    @AfterEach
    void reset() {
        FileUtil.init("target/test-fileutil-root", "http://localhost:8086/upload/");
    }

    @Test
    @DisplayName("buildUrl：生产 base+/upload/ 结尾，干净相对值不叠加")
    void buildUrlProdBaseNoDouble() {
        FileUtil.init("target/test-fileutil-root", PROD_BASE);
        assertThat(FileUtil.buildUrl("/upload/image/e7df.png"))
                .isEqualTo("http://base.yunhaixingtong.com/svc-hall/upload/image/e7df.png");
    }

    @Test
    @DisplayName("buildUrl：本地 base+/upload/ 结尾，干净相对值不叠加")
    void buildUrlLocalBaseNoDouble() {
        FileUtil.init("target/test-fileutil-root", LOCAL_BASE);
        assertThat(FileUtil.buildUrl("/upload/file/abc.pdf"))
                .isEqualTo("http://localhost:8086/upload/file/abc.pdf");
    }

    @Test
    @DisplayName("buildUrl：base 不带 /upload/ 尾时行为不变")
    void buildUrlBaseWithoutUploadTail() {
        FileUtil.init("target/test-fileutil-root", "http://localhost:8086");
        assertThat(FileUtil.buildUrl("/upload/image/a.png"))
                .isEqualTo("http://localhost:8086/upload/image/a.png");
    }

    @Test
    @DisplayName("buildUrl：历史损伤相对值（叠三层）出口折叠自愈——部署态门户裂图修复点")
    void buildUrlSquashesCorruptedRelative() {
        FileUtil.init("target/test-fileutil-root", PROD_BASE);
        assertThat(FileUtil.buildUrl("/upload/upload/upload/image/e7df.png"))
                .isEqualTo("http://base.yunhaixingtong.com/svc-hall/upload/image/e7df.png");
    }

    @Test
    @DisplayName("absolutizePlain：绝对地址原样返回（含历史损伤值，不篡改外链）")
    void absolutizePlainPassthrough() {
        FileUtil.init("target/test-fileutil-root", PROD_BASE);
        String external = "https://cdn.example.com/pic.png";
        assertThat(FileUtil.absolutizePlain(external)).isEqualTo(external);
    }

    @Test
    @DisplayName("absolutize：富文本内链绝对化不叠加 /upload/")
    void absolutizeHtmlNoDouble() {
        FileUtil.init("target/test-fileutil-root", PROD_BASE);
        String html = "<p><img src=\"/upload/image/a.png\">§<a href=\"/upload/file/b.pdf\">附件</a></p>";
        String out = FileUtil.absolutize(html);
        assertThat(out).contains("src=\"http://base.yunhaixingtong.com/svc-hall/upload/image/a.png\"");
        assertThat(out).contains("href=\"http://base.yunhaixingtong.com/svc-hall/upload/file/b.pdf\"");
        assertThat(out).doesNotContain("/upload/upload/");
    }

    @Test
    @DisplayName("squashDuplicateUploadSeg：任意层数叠加收敛为一层")
    void squashCollapsesAnyDepth() {
        assertThat(FileUtil.squashDuplicateUploadSeg("/upload/upload/upload/upload/image/x.png"))
                .isEqualTo("/upload/image/x.png");
        assertThat(FileUtil.squashDuplicateUploadSeg("/upload/image/ok.png"))
                .isEqualTo("/upload/image/ok.png");
        assertThat(FileUtil.squashDuplicateUploadSeg(null)).isNull();
    }

    @Test
    @DisplayName("往返幂等：绝对化 → 存库相对化 → 再绝对化，值稳定不增长")
    void roundTripIdempotent() {
        FileUtil.init("target/test-fileutil-root", PROD_BASE);
        String stored = "/upload/image/e7df.png";
        String out1 = FileUtil.absolutizePlain(stored);
        // 模拟保存侧：取第一个 /upload/ 起的相对段（ServiceItemService.toRelativeIfLocal 同款逻辑）
        String back = out1.substring(out1.indexOf("/upload/"));
        String out2 = FileUtil.absolutizePlain(back);
        assertThat(out2).isEqualTo(out1);
        assertThat(out2).doesNotContain("/upload/upload/");
    }
}