// Copyright 2026 tamakyi. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package route

import (
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/flamego/flamego"

	"github.com/tamakyi/TamaBox/internal/security/autoban"
	"github.com/tamakyi/TamaBox/internal/security/honeypot"
)

// newHoneypotTestServer 造一个只含蜜罐 NotFound 分流的最小 flamego 实例。
//
// 刻意不调用 route.New()（那会拉起 DB/Redis/session 依赖），而是复刻它的
// 关键结构：全局 Use 链 → 具体路由 → NotFound 蜜罐分流。
func newHoneypotTestServer(t *testing.T, enabled bool) *httptest.Server {
	t.Helper()
	f := flamego.New()
	hp := honeypot.New(honeypot.Options{Enabled: enabled})
	ab := autoban.New(autoban.Options{
		Enabled:            true,
		ThresholdSensitive: 1, // 命中一次即封禁，便于断言
		Window:             60,
		Duration:           60,
	})
	hph := newHoneypotHandler(hp, ab, nil) // store=nil → 只走日志，不落库

	f.Get("/login", func(ctx flamego.Context) {
		ctx.ResponseWriter().WriteHeader(http.StatusOK)
		_, _ = ctx.ResponseWriter().Write([]byte("REAL_LOGIN"))
	})
	f.Get("/api/v1/questions", func(ctx flamego.Context) {
		ctx.ResponseWriter().WriteHeader(http.StatusOK)
		_, _ = ctx.ResponseWriter().Write([]byte("REAL_API"))
	})

	f.NotFound(func(ctx flamego.Context) {
		if hp.Match(ctx.Request().URL.Path) {
			hph.Serve(ctx)
			return
		}
		ctx.Redirect("/")
	})

	ts := httptest.NewServer(f)
	t.Cleanup(ts.Close)
	return ts
}

// TestHoneypotServesFakeLoginPage 验证：命中诱饵路径时返回假登录页（含 canary），
// 而不是 302 跳首页。
func TestHoneypotServesFakeLoginPage(t *testing.T) {
	ts := newHoneypotTestServer(t, true)

	resp, err := http.Get(ts.URL + "/wp-login.php")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)

	if resp.StatusCode != http.StatusOK {
		t.Errorf("status = %d, want 200", resp.StatusCode)
	}
	if ct := resp.Header.Get("Content-Type"); !strings.HasPrefix(ct, "text/html") {
		t.Errorf("Content-Type = %q, want text/html", ct)
	}
	if !strings.Contains(string(body), honeypot.CanaryToken) {
		t.Error("假登录页缺少 canary 标记，无法溯源")
	}
	if !strings.Contains(string(body), `name="log"`) || !strings.Contains(string(body), `name="pwd"`) {
		t.Error("假登录页应使用 WordPress 经典字段名 log / pwd")
	}
	if strings.Contains(string(body), "REAL_LOGIN") {
		t.Error("假登录页不应包含真实业务内容")
	}
}

// TestHoneypotDoesNotHijackRealRoutes 是红线测试：真实业务路由绝不能被蜜罐接管。
func TestHoneypotDoesNotHijackRealRoutes(t *testing.T) {
	ts := newHoneypotTestServer(t, true)

	for path, want := range map[string]string{
		"/login":            "REAL_LOGIN",
		"/api/v1/questions": "REAL_API",
	} {
		resp, err := http.Get(ts.URL + path)
		if err != nil {
			t.Fatal(err)
		}
		body, _ := io.ReadAll(resp.Body)
		resp.Body.Close()
		if !strings.Contains(string(body), want) {
			t.Errorf("%s 返回了 %q，期望包含 %q（业务路由被劫持）", path, truncate(string(body), 80), want)
		}
		if strings.Contains(string(body), honeypot.CanaryToken) {
			t.Errorf("%s 命中了蜜罐，业务路由被劫持", path)
		}
	}
}

// TestHoneypotDisabledFallsBackToRedirect 验证：蜜罐关闭时行为与原先一致（302 → /）。
func TestHoneypotDisabledFallsBackToRedirect(t *testing.T) {
	ts := newHoneypotTestServer(t, false)

	client := &http.Client{
		CheckRedirect: func(req *http.Request, via []*http.Request) error {
			return http.ErrUseLastResponse
		},
	}
	resp, err := client.Get(ts.URL + "/wp-login.php")
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusFound {
		t.Errorf("status = %d, want 302", resp.StatusCode)
	}
	if loc := resp.Header.Get("Location"); loc != "/" {
		t.Errorf("Location = %q, want /", loc)
	}
}

// TestHoneypotCapturesCredentials 验证：POST 提交的用户名/密码能被提取出来。
func TestHoneypotCapturesCredentials(t *testing.T) {
	hp := honeypot.New(honeypot.Options{Enabled: true})
	req := httptest.NewRequest(http.MethodPost, "/wp-login.php",
		strings.NewReader("log=admin&pwd=hunter2&redirect_to=%2Fwp-admin%2F"))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	creds := hp.ExtractCredentials(req)
	if creds.Username != "admin" {
		t.Errorf("Username = %q, want admin", creds.Username)
	}
	if creds.Password != "hunter2" {
		t.Errorf("Password = %q, want hunter2", creds.Password)
	}
}

// TestHoneypotPostReturnsFailurePage 验证：POST 后返回 200 的假登录页并带错误提示。
func TestHoneypotPostReturnsFailurePage(t *testing.T) {
	ts := newHoneypotTestServer(t, true)

	resp, err := http.Post(ts.URL+"/wp-login.php",
		"application/x-www-form-urlencoded",
		strings.NewReader("log=admin&pwd=admin"))
	if err != nil {
		t.Fatal(err)
	}
	defer resp.Body.Close()
	body, _ := io.ReadAll(resp.Body)

	if resp.StatusCode != http.StatusOK {
		t.Errorf("status = %d, want 200", resp.StatusCode)
	}
	if !strings.Contains(string(body), honeypot.LoginFailureNotice) {
		t.Error("提交凭据后应返回「用户名或密码无效」的假提示")
	}
}