package core

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"eh-downloader-wails/internal/eh"
)

func sampleGallery() *eh.Gallery {
	return &eh.Gallery{
		GID:   "4239274",
		Title: "[Noxe] 0820 Qingxiao [AI Generated]",
		Meta: eh.GalleryMeta{
			Artist:   "Noxe",
			Group:    "CriticalHAI",
			Series:   "wuthering waves",
			Category: "misc",
			Lang:     "chinese",
			Uploader: "velius11",
			Tags:     []string{"qingxiao", "rover", "big breasts", "x-ray", "ai generated"},
		},
	}
}

func TestBuildDir(t *testing.T) {
	g := sampleGallery()
	tests := []struct {
		tpl  string
		want string
	}{
		{"{title}", "[Noxe] 0820 Qingxiao [AI Generated]"},
		{"{artist}/{title}", `Noxe/[Noxe] 0820 Qingxiao [AI Generated]`},
		{"{group}/{title}", `CriticalHAI/[Noxe] 0820 Qingxiao [AI Generated]`},
		{"{category}/{group}/{title}", `misc/CriticalHAI/[Noxe] 0820 Qingxiao [AI Generated]`},
		{"{tags:2}/{artist}/{title}", `qingxiao_rover/Noxe/[Noxe] 0820 Qingxiao [AI Generated]`},
		{"{tags}/{artist}/{title}", `qingxiao_rover_big breasts_x-ray_ai generated/Noxe/[Noxe] 0820 Qingxiao [AI Generated]`},
		{"{tag1}-{tag2}", "qingxiao-rover"},
		{"{artist} - {gid} - {title}", "Noxe - 4239274 - [Noxe] 0820 Qingxiao [AI Generated]"},
		{"{gid}", "4239274"},
		{"{lang}/{title}", `chinese/[Noxe] 0820 Qingxiao [AI Generated]`},
		{"{unknown}/{title}", `{unknown}/[Noxe] 0820 Qingxiao [AI Generated]`}, // 未知占位符原样保留
	}

	for _, tt := range tests {
		t.Run(tt.tpl, func(t *testing.T) {
			got := BuildDir(tt.tpl, g)
			// 期望值用 / 书写，再换成本机路径分隔符（Windows 是 \）
			want := strings.ReplaceAll(tt.want, "/", string(filepath.Separator))
			if got != want {
				t.Errorf("\n got: %q\nwant: %q", got, want)
			}
		})
	}
}

// 空模板回落到 {title}
func TestBuildDirDefaults(t *testing.T) {
	g := sampleGallery()
	for _, tpl := range []string{"", "   "} {
		if got := BuildDir(tpl, g); !strings.Contains(got, "Noxe") {
			t.Errorf("空模板应回落到标题, got %q", got)
		}
	}
}

// 占位符兜底值
func TestBuildDirFallbacks(t *testing.T) {
	g := &eh.Gallery{GID: "12345678", Title: "Plain Title"}
	got := BuildDir("{artist}/{group}/{series}/{category}/{lang}/{uploader}", g)
	for _, want := range []string{"未知作者", "未知社团", "无系列", "未分类", "nolang", "unknown"} {
		if !strings.Contains(got, want) {
			t.Errorf("缺兜底值 %q: %s", want, got)
		}
	}
}

// 路径穿越必须被挡住
func TestSanitizeSegmentSecurity(t *testing.T) {
	cases := []struct{ in, want string }{
		{"..", "_"},
		{".", "_"},
		{"../../etc/passwd", ".._.._etc_passwd"},
		{`a/b\c:d*e?f"g<h>i|j`, "a_b_c_d_e_f_g_h_i_j"},
		{"CON", "_CON"},       // Windows 保留设备名
		{"nul.txt", "_nul.txt"}, // 保留名带扩展也不行
		{"正常名字", "正常名字"},
		{"trailing dots...", "trailing dots"},
		{"  spaced  ", "spaced"},
	}
	for _, c := range cases {
		if got := SanitizeSegment(c.in, "fb"); got != c.want {
			t.Errorf("SanitizeSegment(%q) = %q, want %q", c.in, got, c.want)
		}
	}
}

// 超长截断
func TestSanitizeSegmentTruncate(t *testing.T) {
	long := strings.Repeat("长", 300)
	got := SanitizeSegment(long, "fb")
	if len([]rune(got)) != 110 {
		t.Errorf("应截到 110 字，实际 %d", len([]rune(got)))
	}
}

// 分隔符混用（用户可能用 / 或 \）
func TestBuildDirMixedSeparators(t *testing.T) {
	g := sampleGallery()
	for _, tpl := range []string{`{artist}/{title}`, `{artist}\{title}`, `{artist}//{title}`} {
		got := BuildDir(tpl, g)
		if strings.Contains(got, "/") || strings.Contains(got, "\\") && strings.Count(got, "\\") > 1 {
			continue // 各平台分隔符不同，只要求不出现空段
		}
		if strings.Contains(got, "__") {
			t.Errorf("出现空段: %q (tpl=%q)", got, tpl)
		}
	}
}

func TestListPlaceholders(t *testing.T) {
	p := ListPlaceholders()
	if len(p) == 0 {
		t.Fatal("占位符列表不该为空")
	}
	found := false
	for _, x := range p {
		if x == "{tags:3}" {
			found = true
		}
	}
	if !found {
		t.Error("缺 {tags:3}")
	}
}

// ---- 代理探测：必须真的等连接结果（JS 版是坏的，永远返回 7890）----

func TestDetectLocalProxy(t *testing.T) {
	// 起一个真实的监听端口
	ln, err := net_listen_loopback()
	if err != nil {
		t.Skipf("无法监听端口，跳过: %v", err)
	}
	defer ln.Close()
	port := ln.port()

	got := DetectLocalProxy([]int{port})
	if got == "" {
		t.Error("有端口在监听，应该探测得到")
		return
	}
	if !strings.Contains(got, "127.0.0.1") {
		t.Errorf("地址不对: %q", got)
	}
}

func TestDetectLocalProxyNone(t *testing.T) {
	// 用一个几乎肯定没人监听的端口
	if got := DetectLocalProxy([]int{1, 2, 3}); got != "" {
		t.Errorf("没端口监听时不该返回结果, got %q", got)
	}
}

func TestDefaultDownloadRoot(t *testing.T) {
	root := DefaultDownloadRoot()
	if root == "" {
		t.Fatal("下载目录不该为空")
	}
	if !strings.HasSuffix(root, "Downloads") && !strings.Contains(root, "Downloads") {
		t.Errorf("路径可疑: %q", root)
	}
	if _, err := os.Stat(root); err == nil {
		// 目录存在也没关系，只确认路径合法
		t.Logf("目录已存在: %s", root)
	}
}