package main

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

func TestRenderGatewayConfAuthPerRoute(t *testing.T) {
	cfg := &GatewayConfig{
		ListenPort: 8081,
		AuthURL:    "http://127.0.0.1:4001/_auth",
		LoginURL:   "https://login.example.com/login",
		Routes: []Route{
			{Host: "protected.example.com", Upstream: "http://10.0.0.1:3000", RequireLogin: true, Websocket: true, MaxBodyMB: 64},
			{Host: "open.example.com", Upstream: "http://10.0.0.2:8000"},
		},
	}
	out, err := RenderGatewayConf(cfg)
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	// 受保护的域名要有 auth_request 与登录跳转
	if !contains(out, "server_name protected.example.com;") {
		t.Fatalf("缺少受保护域名的 server 块:\n%s", out)
	}
	if !contains(out, "auth_request /_auth;") {
		t.Fatalf("受保护域名缺少 auth_request:\n%s", out)
	}
	if !contains(out, "location @login") {
		t.Fatalf("缺少登录跳转")
	}
	if !contains(out, "proxy_set_header Upgrade $http_upgrade;") {
		t.Fatalf("缺少 websocket 透传")
	}
	if !contains(out, "client_max_body_size 64m;") {
		t.Fatalf("缺少上传上限")
	}
	// 不受保护的域名不得出现 auth_request（"哪些服务受保护"是按路由决定的）
	open := section(out, "server_name open.example.com;")
	if open == "" {
		t.Fatalf("缺少开放域名的 server 块")
	}
	// 断言的是"强制闸门" auth_request /_auth;，不是裸字符串：
	// 错误页会合法地带 auth_request off;，用裸字符串会把正确配置判成错误。
	if contains(open, "auth_request /_auth;") {
		t.Fatalf("未受保护的域名不应有强制认证闸门:\n%s", open)
	}
	if !contains(open, "auth_request off;") {
		t.Fatalf("错误页应显式关闭认证:\n%s", open)
	}
	// 兜底 server：未知域名必须被拒绝，而不是落进某条路由
	if !contains(out, "default_server") || !contains(out, "return 404") {
		t.Fatalf("缺少未知域名兜底 server:\n%s", out)
	}
	if contains(open, "client_max_body_size") {
		t.Fatalf("未设置上限时不应生成 client_max_body_size:\n%s", open)
	}
}

func TestRenderGatewayConfRejectsBadInput(t *testing.T) {
	base := func(r Route) *GatewayConfig {
		return &GatewayConfig{ListenPort: 8081, AuthURL: "http://x/_auth", Routes: []Route{r}}
	}
	cases := []struct {
		name string
		cfg  *GatewayConfig
	}{
		{"空域名", base(Route{Host: "", Upstream: "http://a"})},
		{"域名带协议", base(Route{Host: "http://a.com", Upstream: "http://a"})},
		{"后端非 http", base(Route{Host: "a.com", Upstream: "10.0.0.1:80"})},
		{"域名重复", &GatewayConfig{ListenPort: 8081, AuthURL: "http://x/_auth", Routes: []Route{
			{Host: "a.com", Upstream: "http://a"}, {Host: "a.com", Upstream: "http://b"},
		}}},
		{"需认证但无认证地址", &GatewayConfig{ListenPort: 8081, Routes: []Route{{Host: "a.com", Upstream: "http://a", RequireLogin: true}}}},
		{"启用HTTPS但无证书", &GatewayConfig{ListenPort: 8081, ListenHTTPS: true, Routes: []Route{{Host: "a.com", Upstream: "http://a"}}}},
	}
	for _, c := range cases {
		if _, err := RenderGatewayConf(c.cfg); err == nil {
			t.Errorf("%s: 应当报错但没有", c.name)
		}
	}
}

func TestGatewayRoundTrip(t *testing.T) {
	dir := t.TempDir()
	oldFile, oldOut := gatewayFile, gatewayOutDir
	gatewayFile = dir + "/gateway.yml"
	gatewayOutDir = dir + "/gateway"
	defer func() { gatewayFile, gatewayOutDir = oldFile, oldOut }()

	// 文件不存在时应给出默认配置而不是报错
	cfg, err := loadGateway()
	if err != nil {
		t.Fatalf("缺文件应回落默认配置: %v", err)
	}
	if cfg.ListenPort != 8081 || len(cfg.Routes) != 0 {
		t.Fatalf("默认配置不对: %+v", cfg)
	}
	cfg.Routes = []Route{{Host: "a.com", Upstream: "http://a", RequireLogin: true}}
	if err := saveGateway(cfg); err != nil {
		t.Fatalf("保存失败: %v", err)
	}
	got, err := loadGateway()
	if err != nil || len(got.Routes) != 1 || !got.Routes[0].RequireLogin {
		t.Fatalf("回读不一致: %+v err=%v", got, err)
	}
}

func contains(hay, needle string) bool {
	return len(hay) >= len(needle) && (func() bool {
		for i := 0; i+len(needle) <= len(hay); i++ {
			if hay[i:i+len(needle)] == needle {
				return true
			}
		}
		return false
	})()
}

// section 取出 server_name 所属的那个 server 块（到下一个 server{ 之前）
func section(all, marker string) string {
	i := indexOf(all, marker)
	if i < 0 {
		return ""
	}
	start := i
	for start > 0 && all[start-1] != '\n' {
		start--
	}
	rest := all[i:]
	if j := indexOf(rest, "\nserver {"); j >= 0 {
		return rest[:j]
	}
	return rest
}

func indexOf(hay, needle string) int {
	for i := 0; i+len(needle) <= len(hay); i++ {
		if hay[i:i+len(needle)] == needle {
			return i
		}
	}
	return -1
}

// 未知域名必须走内置自定义 404 页面，而不是一行纯文本。
func TestRenderGatewayConfUsesCustomErrorPages(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, AuthURL: "http://x/_auth",
		LoginURL: "https://l/login", Routes: []Route{{Host: "a.com", Upstream: "http://a"}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	for _, want := range []string{
		"default_server",
		"error_page 404 /404.html;",
		"error_page 500 502 503 504 /500.html;",
		"root /app/portal;",
	} {
		if !contains(out, want) {
			t.Fatalf("缺少 %q:\n%s", want, out)
		}
	}
	if contains(out, `return 404 "unknown host`) {
		t.Fatalf("不应再返回纯文本 404:\n%s", out)
	}
}

// 门户静态页类型：不需要后端，且必须能直接给出 404 页面。
func TestRenderGatewayConfPortalKind(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{
		{Host: "example.com", Kind: "portal"},
	}})
	if err != nil {
		t.Fatalf("portal 类型不应要求后端: %v", err)
	}
	if !contains(out, "server_name example.com;") || !contains(out, "try_files $uri $uri/ /404.html;") {
		t.Fatalf("portal 段生成不对:\n%s", out)
	}
}

// 加入导航必须同时给出分组名与名称；历史访问是系统分组。
func TestValidateRouteNavigation(t *testing.T) {
	cases := []struct {
		name    string
		r       Route
		wantErr bool
	}{
		{"缺少导航名称", Route{Host: "a.com", Upstream: "http://a", NavEnabled: true, NavSection: "常用服务"}, true},
		{"缺少分组", Route{Host: "a.com", Upstream: "http://a", NavEnabled: true, NavName: "A"}, true},
		{"占用历史分组", Route{Host: "a.com", Upstream: "http://a", NavEnabled: true, NavName: "A", NavSection: "历史访问"}, true},
		{"合法", Route{Host: "a.com", Upstream: "http://a", NavEnabled: true, NavName: "A", NavSection: "常用服务"}, false},
		{"未加入导航则不校验", Route{Host: "a.com", Upstream: "http://a"}, false},
		{"免认证路径非法", Route{Host: "a.com", Upstream: "http://a", BypassPaths: []string{"search"}}, true},
	}
	for _, c := range cases {
		err := ValidateRoute(c.r)
		if c.wantErr && err == nil {
			t.Errorf("%s: 应当报错", c.name)
		}
		if !c.wantErr && err != nil {
			t.Errorf("%s: 不应报错，得到 %v", c.name, err)
		}
	}
}

// 路由即导航：写入分组、同 host 去重、清理已移除的托管项、不动历史分组。
func TestSyncGatewayNavigation(t *testing.T) {
	dir := t.TempDir()
	oldConf, oldURL := confFile, historyBaseURL
	confFile, historyBaseURL = dir+"/conf.yml", "http://127.0.0.1:1"
	defer func() { confFile, historyBaseURL = oldConf, oldURL }()

	seed := `appConfig: {}
pageInfo: {}
sections:
  - name: 常用服务
    icon: fas fa-star
    items:
      - title: Gitea
        url: https://gitea.example.com
      - title: 手工项
        url: https://manual.example.com
  - name: 历史访问
    icon: fas fa-history
    items:
      - title: 历史项
        url: https://history.example.com
`
	if err := os.WriteFile(confFile, []byte(seed), 0o644); err != nil {
		t.Fatal(err)
	}

	gw := &GatewayConfig{Routes: []Route{
		{Host: "gitea.example.com", Upstream: "http://127.0.0.1:3000", NavEnabled: true, NavSection: "常用服务", NavName: "Gitea", NavDescription: "代码仓库", NavAutoIcon: true},
		{Host: "new.example.com", Upstream: "http://127.0.0.1:9000", NavEnabled: true, NavSection: "常用服务", NavName: "新服务"},
		{Host: "hidden.example.com", Upstream: "http://127.0.0.1:9001", NavEnabled: false},
	}}
	if err := syncGatewayNavigation(gw); err != nil {
		t.Fatalf("同步失败: %v", err)
	}
	cfg, err := loadConfig()
	if err != nil {
		t.Fatal(err)
	}
	names := map[string]int{}
	for _, s := range cfg.Sections {
		for _, it := range s.Items {
			names[it.Title]++
			if s.Name == "历史访问" && it.Title != "历史项" {
				t.Fatalf("历史分组被写入手工项: %+v", it)
			}
		}
	}
	if names["Gitea"] != 1 {
		t.Fatalf("同 host 应被接管而不是重复，Gitea 出现 %d 次", names["Gitea"])
	}
	if names["新服务"] != 1 {
		t.Fatalf("新托管项未写入")
	}
	if names["手工项"] != 1 {
		t.Fatalf("无关手工项被误删")
	}
	if names["历史项"] != 1 {
		t.Fatalf("历史分组内容被改动")
	}
	// 未加入导航的路由不得出现在导航里
	if names["hidden.example.com"] != 0 {
		t.Fatalf("未勾选导航的路由不应写入")
	}

	// 再次同步：勾选取消后，托管项应被清理；手工项与历史项保留
	gw.Routes = []Route{{Host: "gitea.example.com", Upstream: "http://127.0.0.1:3000"}}
	if err := syncGatewayNavigation(gw); err != nil {
		t.Fatal(err)
	}
	cfg, _ = loadConfig()
	after := map[string]int{}
	for _, s := range cfg.Sections {
		for _, it := range s.Items {
			after[it.Title]++
		}
	}
	if after["Gitea"] != 0 || after["新服务"] != 0 {
		t.Fatalf("托管项未被清理: %+v", after)
	}
	if after["手工项"] != 1 || after["历史项"] != 1 {
		t.Fatalf("非托管项被误删: %+v", after)
	}
}

// 分组不存在时必须报错，避免把导航写进不存在的栏目。
func TestSyncGatewayNavigationMissingSection(t *testing.T) {
	dir := t.TempDir()
	oldConf, oldURL := confFile, historyBaseURL
	confFile, historyBaseURL = dir+"/conf.yml", "http://127.0.0.1:1"
	defer func() { confFile, historyBaseURL = oldConf, oldURL }()
	_ = os.WriteFile(confFile, []byte("appConfig: {}\npageInfo: {}\nsections: []\n"), 0o644)

	err := syncGatewayNavigation(&GatewayConfig{Routes: []Route{
		{Host: "a.com", Upstream: "http://a", NavEnabled: true, NavSection: "不存在", NavName: "A"},
	}})
	if err == nil {
		t.Fatalf("分组不存在时应报错")
	}
}

// 登录域名必须指向容器内自带的登录服务，不能生成空的 proxy_pass。
func TestRenderGatewayConfAuthKind(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{
		{Host: "login.example.com", Kind: "auth"},
	}})
	if err != nil {
		t.Fatalf("auth 类型不应要求后端: %v", err)
	}
	if !contains(out, "proxy_pass http://127.0.0.1:3005;") {
		t.Fatalf("auth 类型应指向内置登录服务:\n%s", out)
	}
	if contains(out, "proxy_pass ;") {
		t.Fatalf("生成了空的 proxy_pass:\n%s", out)
	}
}

// TLS 段不得使用 nginx 1.22 不认识的 `http2 on;`，必须写成 listen 参数。
func TestRenderGatewayConfTLSHttp2Compatible(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{
		ListenHTTPS: true, ListenPort: 18443, ListenTLSPort: 18443,
		CertFile: "/c/fullchain.pem", KeyFile: "/c/privkey.pem",
		Routes: []Route{{Host: "a.com", Upstream: "http://a"}},
	})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if contains(out, "http2 on;") {
		t.Fatalf("不得输出 `http2 on;`（nginx 1.22 不支持）:\n%s", out)
	}
	if !contains(out, "listen 18443 ssl http2;") {
		t.Fatalf("TLS 监听应带 http2 参数:\n%s", out)
	}
	if !contains(out, "ssl_certificate '/c/fullchain.pem';") {
		t.Fatalf("证书路径未写入")
	}
}

// 错误页必须 auth_request off：否则上游故障会以 401 呈现，自定义错误页永远看不到。
func TestRenderGatewayConfErrorPagesSkipAuth(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, AuthURL: "http://x/_auth",
		LoginURL: "https://l/login", Routes: []Route{{Host: "a.com", Upstream: "http://a", RequireLogin: true}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	for _, want := range []string{
		"location = /500.html { internal; auth_request off; }",
		"location = /404.html { internal; auth_request off; }",
		"location ^~ /css/ { auth_request off;",
	} {
		if !contains(out, want) {
			t.Fatalf("错误页缺少 auth_request off（%q）:\n%s", want, out)
		}
	}
}

// 门户首页必须走 admin-server 渲染（否则 pageInfo 文案不可配置、占位符会裸露）。
func TestPortalKindUsesRenderer(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{{Host: "p.com", Kind: "portal"}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if !contains(out, "proxy_pass http://127.0.0.1:3005/portal-page;") {
		t.Fatalf("门户首页未指向渲染器:\n%s", out)
	}
	if !contains(out, "root /app/portal;") {
		t.Fatalf("静态资源根目录丢失:\n%s", out)
	}
}

// nginx 不允许**同一个 server 段**内出现重复的 root 指令（实测 emerg）。
// 注意：不同 server 段各有一个 root 是正常的，所以必须按段计数。
func TestPortalKindNoDuplicateRoot(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{{Host: "p.com", Kind: "portal"}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	block := section(out, "server_name p.com;")
	if block == "" {
		t.Fatalf("未找到门户段:\n%s", out)
	}
	if n := strings.Count(block, "root "); n != 1 {
		t.Fatalf("门户段内 root 指令应恰好 1 次，实际 %d 次:\n%s", n, block)
	}
}

// redirectWithPort=true 时跳转目标带入口端口（对外端口=入口端口的部署）。
func TestRedirectTargetIncludesEntryPort(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{
		ListenPort: 3080, ListenTLSPort: 8443, RedirectPort: 3081, ListenHTTPS: true, RedirectWithPort: true,
		CertFile: "/etc/nginx/certs/fullchain.pem", KeyFile: "/etc/nginx/certs/privkey.pem",
		AuthURL: "http://127.0.0.1:3005/auth/verify", LoginURL: "https://login.x.com/login",
		Routes: []Route{{Host: "x.com", Kind: "portal"}},
	})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if !strings.Contains(out, "return 302 https://$host:3080$request_uri;") {
		t.Fatalf("跳转目标未带端口:\n%s", out)
	}
}

// 标准 443 部署不应出现 :443 后缀。
func TestRedirectTargetOmitsPortOn443(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{
		ListenPort: 443, RedirectPort: 3081, ListenHTTPS: true,
		CertFile: "/etc/nginx/certs/fullchain.pem", KeyFile: "/etc/nginx/certs/privkey.pem",
		AuthURL: "http://127.0.0.1:3005/auth/verify", LoginURL: "https://login.x.com/login",
		Routes: []Route{{Host: "x.com", Kind: "portal"}},
	})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if !strings.Contains(out, "return 302 https://$host$request_uri;") || strings.Contains(out, "$host:443") {
		t.Fatalf("443 部署跳转目标不正确:\n%s", out)
	}
}

// 默认（redirectWithPort=false）即使入口不是 443 也不带端口——
// 生产就是这种：监听 3080，对外经 frp 是 443，带端口会把公网用户导向 :3080。
func TestRedirectDefaultsNoPortOnNonStandardPort(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{
		ListenPort: 3080, RedirectPort: 3081, ListenHTTPS: true, RedirectWithPort: false,
		CertFile: "/etc/nginx/certs/fullchain.pem", KeyFile: "/etc/nginx/certs/privkey.pem",
		AuthURL: "http://127.0.0.1:3005/auth/verify", LoginURL: "https://login.x.com/login",
		Routes: []Route{{Host: "x.com", Kind: "portal"}},
	})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if !strings.Contains(out, "return 302 https://$host$request_uri;") || strings.Contains(out, "$host:3080") {
		t.Fatalf("默认不应带端口:\n%s", out)
	}
}

// 注进被代理页面的备案号必须来自站点信息（可配置），不能再写死。
func TestBeianInjectionUsesPageInfo(t *testing.T) {
	dir := t.TempDir()
	old := confFile
	defer func() { confFile = old }()
	confFile = filepath.Join(dir, "conf.yml")
	if err := os.WriteFile(confFile, []byte("pageInfo:\n  icp: 京ICP备12345678号-1\n  gongan: 京公网安备11000000000001号\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{{Host: "a.com", Upstream: "http://1.1.1.1:80", InjectBeian: true}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if !strings.Contains(out, "京ICP备12345678号-1") || !strings.Contains(out, "京公网安备11000000000001号") {
		t.Fatalf("未使用配置的备案号:\n%s", out)
	}
}

// 未配置备案号时不注入（不得残留任何硬编码备案号）。
func TestBeianInjectionSkippedWhenUnset(t *testing.T) {
	dir := t.TempDir()
	old := confFile
	defer func() { confFile = old }()
	confFile = filepath.Join(dir, "conf.yml")
	if err := os.WriteFile(confFile, []byte("pageInfo: {}\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{{Host: "a.com", Upstream: "http://1.1.1.1:80", InjectBeian: true}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if strings.Contains(out, "navi-proxy-beian") {
		t.Fatalf("未配置备案号却注入了:\n%s", out)
	}
}

// 备案号里的引号/美元符不能破坏 nginx 配置。
func TestBeianInjectionSanitized(t *testing.T) {
	dir := t.TempDir()
	old := confFile
	defer func() { confFile = old }()
	confFile = filepath.Join(dir, "conf.yml")
	if err := os.WriteFile(confFile, []byte("pageInfo:\n  icp: \"a';b$c\"\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 8081, Routes: []Route{{Host: "a.com", Upstream: "http://1.1.1.1:80", InjectBeian: true}}})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if strings.Contains(out, "';b") || strings.Contains(out, "b$c") {
		t.Fatalf("危险字符未清理:\n%s", out)
	}
}

// 代理到上游的 server 块**不得**包含门户自己的 favicon location：
// try_files 是在门户 root 里找文件，会把被代理站点的 /favicon.ico 顶成门户图标
// （实测 pi / ittools / vikunja 三个站点的导航图标因此变成同一张门户图标）。
func TestProxyRouteDoesNotShadowUpstreamFavicon(t *testing.T) {
	out, err := RenderGatewayConf(&GatewayConfig{ListenPort: 3081, Routes: []Route{
		{Host: "proxy.example", Upstream: "http://127.0.0.1:8080"},
		{Host: "portal.example", Kind: "portal"},
	}})
	if err != nil {
		t.Fatal(err)
	}
	// 切出 proxy.example 的 server 块单独断言，避免被门户块的正常输出干扰
	blocks := strings.Split(out, "server {")
	var proxyBlock, portalBlock string
	for _, b := range blocks {
		if strings.Contains(b, "server_name proxy.example;") {
			proxyBlock = b
		}
		if strings.Contains(b, "server_name portal.example;") {
			portalBlock = b
		}
	}
	if proxyBlock == "" || portalBlock == "" {
		t.Fatalf("server blocks not found\n%s", out)
	}
	if strings.Contains(proxyBlock, "location = /favicon.ico") {
		t.Errorf("代理块不应提供门户 favicon（会顶掉上游图标）:\n%s", proxyBlock)
	}
	if strings.Contains(proxyBlock, "location = /favicon.svg") {
		t.Errorf("代理块不应提供门户 favicon.svg:\n%s", proxyBlock)
	}
	if !strings.Contains(portalBlock, "location = /favicon.ico") {
		t.Errorf("门户块应保留门户 favicon:\n%s", portalBlock)
	}
}