package security

import (
	"testing"

	"github.com/valyala/fasthttp"
	"rua.plus/lolly/internal/config"
)

func TestNewSecurityHeaders(t *testing.T) {
	tests := []struct {
		name string
		cfg  *config.SecurityHeaders
	}{
		{
			name: "nil config uses defaults",
			cfg:  nil,
		},
		{
			name: "custom config",
			cfg: &config.SecurityHeaders{
				XFrameOptions:         "SAMEORIGIN",
				XContentTypeOptions:   "nosniff",
				ContentSecurityPolicy: "default-src 'self'",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			sh := NewSecurityHeaders(tt.cfg)
			if sh == nil {
				t.Error("Expected non-nil SecurityHeadersMiddleware")
			}
		})
	}
}

func TestSecurityHeadersName(t *testing.T) {
	sh := NewSecurityHeaders(nil)
	if sh.Name() != "security_headers" {
		t.Errorf("Expected name 'security_headers', got %s", sh.Name())
	}
}

func TestSecurityHeadersProcess(t *testing.T) {
	cfg := &config.SecurityHeaders{
		XFrameOptions:         "DENY",
		XContentTypeOptions:   "nosniff",
		ContentSecurityPolicy: "default-src 'self'",
		ReferrerPolicy:        "strict-origin-when-cross-origin",
		PermissionsPolicy:     "geolocation=()",
	}

	sh := NewSecurityHeaders(cfg)

	handlerCalled := false
	nextHandler := func(ctx *fasthttp.RequestCtx) {
		handlerCalled = true
		ctx.WriteString("OK")
	}

	handler := sh.Process(nextHandler)
	if handler == nil {
		t.Fatal("Process() returned nil handler")
	}

	// Create request context and call handler
	ctx := &fasthttp.RequestCtx{}
	handler(ctx)

	// Check headers were set
	headers := &ctx.Response.Header

	if string(headers.Peek("X-Frame-Options")) != "DENY" {
		t.Errorf("X-Frame-Options not set correctly, got %s", headers.Peek("X-Frame-Options"))
	}

	if string(headers.Peek("X-Content-Type-Options")) != "nosniff" {
		t.Errorf("X-Content-Type-Options not set correctly, got %s", headers.Peek("X-Content-Type-Options"))
	}

	if string(headers.Peek("Content-Security-Policy")) != "default-src 'self'" {
		t.Errorf("Content-Security-Policy not set correctly, got %s", headers.Peek("Content-Security-Policy"))
	}

	if string(headers.Peek("Referrer-Policy")) != "strict-origin-when-cross-origin" {
		t.Errorf("Referrer-Policy not set correctly, got %s", headers.Peek("Referrer-Policy"))
	}

	if string(headers.Peek("Permissions-Policy")) != "geolocation=()" {
		t.Errorf("Permissions-Policy not set correctly, got %s", headers.Peek("Permissions-Policy"))
	}

	if !handlerCalled {
		t.Error("Next handler was not called")
	}
}

func TestSecurityHeadersHSTS(t *testing.T) {
	cfg := &config.SecurityHeaders{
		XFrameOptions: "DENY",
	}

	sh := NewSecurityHeaders(cfg)

	nextHandler := func(ctx *fasthttp.RequestCtx) {
		ctx.WriteString("OK")
	}

	handler := sh.Process(nextHandler)

	// Simulate TLS connection
	ctx := &fasthttp.RequestCtx{}
	ctx.Request.SetRequestURI("https://example.com/")
	// Note: In actual testing, ctx.IsTLS() requires connection setup

	handler(ctx)

	// HSTS header would be set when TLS is active
	// In this test we verify the handler doesn't panic
}

func TestSecurityHeadersUpdate(t *testing.T) {
	sh := NewSecurityHeaders(nil)

	// Update X-Frame-Options
	sh.SetXFrameOptions("SAMEORIGIN")
	cfg := sh.GetConfig()
	if cfg.XFrameOptions != "SAMEORIGIN" {
		t.Errorf("Expected X-Frame-Options 'SAMEORIGIN', got %s", cfg.XFrameOptions)
	}

	// Update CSP
	sh.SetContentSecurityPolicy("default-src 'unsafe-inline'")
	cfg = sh.GetConfig()
	if cfg.ContentSecurityPolicy != "default-src 'unsafe-inline'" {
		t.Errorf("Expected CSP update, got %s", cfg.ContentSecurityPolicy)
	}

	// Update Referrer-Policy
	sh.SetReferrerPolicy("no-referrer")
	cfg = sh.GetConfig()
	if cfg.ReferrerPolicy != "no-referrer" {
		t.Errorf("Expected Referrer-Policy 'no-referrer', got %s", cfg.ReferrerPolicy)
	}

	// Update Permissions-Policy
	sh.SetPermissionsPolicy("camera=()")
	cfg = sh.GetConfig()
	if cfg.PermissionsPolicy != "camera=()" {
		t.Errorf("Expected Permissions-Policy 'camera=()', got %s", cfg.PermissionsPolicy)
	}
}

func TestUpdateConfig(t *testing.T) {
	sh := NewSecurityHeaders(nil)

	newCfg := &config.SecurityHeaders{
		XFrameOptions:  "DENY",
		ReferrerPolicy: "no-referrer",
	}

	sh.UpdateConfig(newCfg)

	cfg := sh.GetConfig()
	if cfg.XFrameOptions != "DENY" {
		t.Errorf("Expected X-Frame-Options 'DENY', got %s", cfg.XFrameOptions)
	}
	if cfg.ReferrerPolicy != "no-referrer" {
		t.Errorf("Expected Referrer-Policy 'no-referrer', got %s", cfg.ReferrerPolicy)
	}
}

func TestDefaultSecurityHeaders(t *testing.T) {
	cfg := DefaultSecurityHeaders()

	if cfg.XFrameOptions != "DENY" {
		t.Errorf("Expected default X-Frame-Options 'DENY', got %s", cfg.XFrameOptions)
	}
	if cfg.XContentTypeOptions != "nosniff" {
		t.Errorf("Expected default X-Content-Type-Options 'nosniff', got %s", cfg.XContentTypeOptions)
	}
}

func TestStrictSecurityHeaders(t *testing.T) {
	cfg := StrictSecurityHeaders()

	if cfg.XFrameOptions != "DENY" {
		t.Errorf("Expected X-Frame-Options 'DENY', got %s", cfg.XFrameOptions)
	}
	if cfg.ReferrerPolicy != "no-referrer" {
		t.Errorf("Expected Referrer-Policy 'no-referrer', got %s", cfg.ReferrerPolicy)
	}
	if cfg.ContentSecurityPolicy == "" {
		t.Error("Expected non-empty CSP for strict config")
	}
}

func TestDevelopmentSecurityHeaders(t *testing.T) {
	cfg := DevelopmentSecurityHeaders()

	if cfg.XFrameOptions != "SAMEORIGIN" {
		t.Errorf("Expected X-Frame-Options 'SAMEORIGIN' for dev, got %s", cfg.XFrameOptions)
	}
}

func TestFormatHSTSValue(t *testing.T) {
	tests := []struct {
		name              string
		maxAge            int
		includeSubDomains bool
		preload           bool
		expected          string
	}{
		{
			name:              "basic HSTS",
			maxAge:            31536000,
			includeSubDomains: true,
			preload:           false,
			expected:          "max-age=31536000; includeSubDomains",
		},
		{
			name:              "HSTS with preload",
			maxAge:            31536000,
			includeSubDomains: true,
			preload:           true,
			expected:          "max-age=31536000; includeSubDomains; preload",
		},
		{
			name:              "HSTS without subdomains",
			maxAge:            86400,
			includeSubDomains: false,
			preload:           false,
			expected:          "max-age=86400",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			result := formatHSTSValue(tt.maxAge, tt.includeSubDomains, tt.preload)
			if result != tt.expected {
				t.Errorf("formatHSTSValue() = %s, expected %s", result, tt.expected)
			}
		})
	}
}