package middleware

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

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
)

func TestSecurityHeaders(t *testing.T) {
	gin.SetMode(gin.TestMode)

	router := gin.New()
	router.Use(SecurityHeaders())
	router.GET("/test", func(c *gin.Context) {
		c.String(200, "OK")
	})
	router.GET("/swagger/index.html", func(c *gin.Context) {
		c.String(200, "Swagger UI")
	})

	tests := []struct {
		name           string
		path           string
		wantCSP        bool
		wantSTS        bool // Strict-Transport-Security (only for HTTPS)
	}{
		{
			name:    "regular API endpoint",
			path:    "/test",
			wantCSP: true,
			wantSTS: false, // HTTP request
		},
		{
			name:    "swagger endpoint no CSP",
			path:    "/swagger/index.html",
			wantCSP: false,
			wantSTS: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			w := httptest.NewRecorder()
			req, _ := http.NewRequest("GET", tt.path, nil)
			router.ServeHTTP(w, req)

			// 基础安全头
			assert.Equal(t, "nosniff", w.Header().Get("X-Content-Type-Options"))
			assert.Equal(t, "DENY", w.Header().Get("X-Frame-Options"))
			assert.Equal(t, "strict-origin-when-cross-origin", w.Header().Get("Referrer-Policy"))
			assert.Equal(t, "camera=(), microphone=(), geolocation=()", w.Header().Get("Permissions-Policy"))
			assert.Equal(t, "same-origin", w.Header().Get("Cross-Origin-Opener-Policy"))
			assert.Equal(t, "none", w.Header().Get("X-Permitted-Cross-Domain-Policies"))

			// CSP 头
			if tt.wantCSP {
				assert.NotEmpty(t, w.Header().Get("Content-Security-Policy"))
			}
		})
	}
}

func TestShouldAttachCSP(t *testing.T) {
	tests := []struct {
		name        string
		routePath   string
		requestPath string
		expected    bool
	}{
		{
			name:        "non-swagger path",
			routePath:   "/api/v1/users",
			requestPath: "/api/v1/users",
			expected:    true,
		},
		{
			name:        "swagger path",
			routePath:   "/swagger/index.html",
			requestPath: "/swagger/index.html",
			expected:    false,
		},
		{
			name:        "swagger subpath",
			routePath:   "/swagger/api-docs",
			requestPath: "/swagger/api-docs",
			expected:    false,
		},
		{
			name:        "empty routePath uses requestPath",
			routePath:   "",
			requestPath: "/swagger/",
			expected:    false,
		},
		{
			name:        "trimmed spaces",
			routePath:   "  /api/v1/users  ",
			requestPath: "/api/v1/users",
			expected:    true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := shouldAttachCSP(tt.routePath, tt.requestPath)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestIsHTTPSRequest(t *testing.T) {
	gin.SetMode(gin.TestMode)

	tests := []struct {
		name     string
		setup    func(*http.Request)
		expected bool
	}{
		{
			name:     "plain HTTP request",
			setup:    func(req *http.Request) {},
			expected: false,
		},
		{
			name: "X-Forwarded-Proto is https",
			setup: func(req *http.Request) {
				req.Header.Set("X-Forwarded-Proto", "https")
			},
			expected: true,
		},
		{
			name: "X-Forwarded-Proto is HTTPS (uppercase)",
			setup: func(req *http.Request) {
				req.Header.Set("X-Forwarded-Proto", "HTTPS")
			},
			expected: true,
		},
		{
			name: "X-Forwarded-Proto is http",
			setup: func(req *http.Request) {
				req.Header.Set("X-Forwarded-Proto", "http")
			},
			expected: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c, _ := gin.CreateTestContext(httptest.NewRecorder())
			req, _ := http.NewRequest("GET", "/test", nil)
			tt.setup(req)
			c.Request = req

			result := isHTTPSRequest(c)
			assert.Equal(t, tt.expected, result)
		})
	}
}